forked from OSchip/llvm-project
3417 lines
122 KiB
C++
3417 lines
122 KiB
C++
//===-- DWARFExpression.cpp -------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Expression/DWARFExpression.h"
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#include <inttypes.h>
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#include <vector>
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#include "lldb/Core/Module.h"
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#include "lldb/Core/Value.h"
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#include "lldb/Core/dwarf.h"
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#include "lldb/Utility/DataEncoder.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/RegisterValue.h"
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#include "lldb/Utility/Scalar.h"
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#include "lldb/Utility/StreamString.h"
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#include "lldb/Utility/VMRange.h"
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#include "lldb/Host/Host.h"
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#include "lldb/Utility/Endian.h"
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#include "lldb/Symbol/Function.h"
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#include "lldb/Target/ABI.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Target/StackFrame.h"
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#include "lldb/Target/StackID.h"
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#include "lldb/Target/Thread.h"
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#include "Plugins/SymbolFile/DWARF/DWARFUnit.h"
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using namespace lldb;
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using namespace lldb_private;
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static lldb::addr_t
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ReadAddressFromDebugAddrSection(const DWARFUnit *dwarf_cu,
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uint32_t index) {
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uint32_t index_size = dwarf_cu->GetAddressByteSize();
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dw_offset_t addr_base = dwarf_cu->GetAddrBase();
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lldb::offset_t offset = addr_base + index * index_size;
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return dwarf_cu->GetSymbolFileDWARF()->get_debug_addr_data().GetMaxU64(
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&offset, index_size);
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}
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//----------------------------------------------------------------------
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// DWARFExpression constructor
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//----------------------------------------------------------------------
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DWARFExpression::DWARFExpression(DWARFUnit *dwarf_cu)
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: m_module_wp(), m_data(), m_dwarf_cu(dwarf_cu),
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m_reg_kind(eRegisterKindDWARF), m_loclist_slide(LLDB_INVALID_ADDRESS) {}
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DWARFExpression::DWARFExpression(const DWARFExpression &rhs)
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: m_module_wp(rhs.m_module_wp), m_data(rhs.m_data),
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m_dwarf_cu(rhs.m_dwarf_cu), m_reg_kind(rhs.m_reg_kind),
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m_loclist_slide(rhs.m_loclist_slide) {}
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DWARFExpression::DWARFExpression(lldb::ModuleSP module_sp,
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const DataExtractor &data,
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DWARFUnit *dwarf_cu,
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lldb::offset_t data_offset,
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lldb::offset_t data_length)
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: m_module_wp(), m_data(data, data_offset, data_length),
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m_dwarf_cu(dwarf_cu), m_reg_kind(eRegisterKindDWARF),
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m_loclist_slide(LLDB_INVALID_ADDRESS) {
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if (module_sp)
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m_module_wp = module_sp;
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}
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//----------------------------------------------------------------------
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// Destructor
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//----------------------------------------------------------------------
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DWARFExpression::~DWARFExpression() {}
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bool DWARFExpression::IsValid() const { return m_data.GetByteSize() > 0; }
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void DWARFExpression::SetOpcodeData(const DataExtractor &data) {
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m_data = data;
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}
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void DWARFExpression::CopyOpcodeData(lldb::ModuleSP module_sp,
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const DataExtractor &data,
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lldb::offset_t data_offset,
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lldb::offset_t data_length) {
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const uint8_t *bytes = data.PeekData(data_offset, data_length);
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if (bytes) {
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m_module_wp = module_sp;
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m_data.SetData(DataBufferSP(new DataBufferHeap(bytes, data_length)));
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m_data.SetByteOrder(data.GetByteOrder());
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m_data.SetAddressByteSize(data.GetAddressByteSize());
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}
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}
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void DWARFExpression::CopyOpcodeData(const void *data,
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lldb::offset_t data_length,
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ByteOrder byte_order,
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uint8_t addr_byte_size) {
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if (data && data_length) {
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m_data.SetData(DataBufferSP(new DataBufferHeap(data, data_length)));
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m_data.SetByteOrder(byte_order);
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m_data.SetAddressByteSize(addr_byte_size);
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}
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}
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void DWARFExpression::CopyOpcodeData(uint64_t const_value,
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lldb::offset_t const_value_byte_size,
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uint8_t addr_byte_size) {
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if (const_value_byte_size) {
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m_data.SetData(
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DataBufferSP(new DataBufferHeap(&const_value, const_value_byte_size)));
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m_data.SetByteOrder(endian::InlHostByteOrder());
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m_data.SetAddressByteSize(addr_byte_size);
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}
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}
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void DWARFExpression::SetOpcodeData(lldb::ModuleSP module_sp,
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const DataExtractor &data,
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lldb::offset_t data_offset,
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lldb::offset_t data_length) {
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m_module_wp = module_sp;
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m_data.SetData(data, data_offset, data_length);
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}
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void DWARFExpression::DumpLocation(Stream *s, lldb::offset_t offset,
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lldb::offset_t length,
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lldb::DescriptionLevel level,
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ABI *abi) const {
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if (!m_data.ValidOffsetForDataOfSize(offset, length))
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return;
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const lldb::offset_t start_offset = offset;
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const lldb::offset_t end_offset = offset + length;
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while (m_data.ValidOffset(offset) && offset < end_offset) {
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const lldb::offset_t op_offset = offset;
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const uint8_t op = m_data.GetU8(&offset);
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switch (level) {
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default:
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break;
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case lldb::eDescriptionLevelBrief:
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if (op_offset > start_offset)
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s->PutChar(' ');
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break;
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case lldb::eDescriptionLevelFull:
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case lldb::eDescriptionLevelVerbose:
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if (op_offset > start_offset)
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s->EOL();
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s->Indent();
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if (level == lldb::eDescriptionLevelFull)
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break;
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// Fall through for verbose and print offset and DW_OP prefix..
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s->Printf("0x%8.8" PRIx64 ": %s", op_offset,
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op >= DW_OP_APPLE_uninit ? "DW_OP_APPLE_" : "DW_OP_");
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break;
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}
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switch (op) {
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case DW_OP_addr:
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*s << "DW_OP_addr(" << m_data.GetAddress(&offset) << ") ";
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break; // 0x03 1 address
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case DW_OP_deref:
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*s << "DW_OP_deref";
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break; // 0x06
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case DW_OP_const1u:
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s->Printf("DW_OP_const1u(0x%2.2x)", m_data.GetU8(&offset));
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break; // 0x08 1 1-byte constant
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case DW_OP_const1s:
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s->Printf("DW_OP_const1s(0x%2.2x)", m_data.GetU8(&offset));
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break; // 0x09 1 1-byte constant
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case DW_OP_const2u:
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s->Printf("DW_OP_const2u(0x%4.4x)", m_data.GetU16(&offset));
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break; // 0x0a 1 2-byte constant
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case DW_OP_const2s:
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s->Printf("DW_OP_const2s(0x%4.4x)", m_data.GetU16(&offset));
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break; // 0x0b 1 2-byte constant
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case DW_OP_const4u:
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s->Printf("DW_OP_const4u(0x%8.8x)", m_data.GetU32(&offset));
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break; // 0x0c 1 4-byte constant
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case DW_OP_const4s:
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s->Printf("DW_OP_const4s(0x%8.8x)", m_data.GetU32(&offset));
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break; // 0x0d 1 4-byte constant
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case DW_OP_const8u:
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s->Printf("DW_OP_const8u(0x%16.16" PRIx64 ")", m_data.GetU64(&offset));
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break; // 0x0e 1 8-byte constant
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case DW_OP_const8s:
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s->Printf("DW_OP_const8s(0x%16.16" PRIx64 ")", m_data.GetU64(&offset));
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break; // 0x0f 1 8-byte constant
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case DW_OP_constu:
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s->Printf("DW_OP_constu(0x%" PRIx64 ")", m_data.GetULEB128(&offset));
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break; // 0x10 1 ULEB128 constant
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case DW_OP_consts:
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s->Printf("DW_OP_consts(0x%" PRId64 ")", m_data.GetSLEB128(&offset));
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break; // 0x11 1 SLEB128 constant
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case DW_OP_dup:
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s->PutCString("DW_OP_dup");
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break; // 0x12
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case DW_OP_drop:
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s->PutCString("DW_OP_drop");
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break; // 0x13
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case DW_OP_over:
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s->PutCString("DW_OP_over");
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break; // 0x14
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case DW_OP_pick:
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s->Printf("DW_OP_pick(0x%2.2x)", m_data.GetU8(&offset));
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break; // 0x15 1 1-byte stack index
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case DW_OP_swap:
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s->PutCString("DW_OP_swap");
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break; // 0x16
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case DW_OP_rot:
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s->PutCString("DW_OP_rot");
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break; // 0x17
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case DW_OP_xderef:
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s->PutCString("DW_OP_xderef");
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break; // 0x18
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case DW_OP_abs:
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s->PutCString("DW_OP_abs");
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break; // 0x19
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case DW_OP_and:
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s->PutCString("DW_OP_and");
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break; // 0x1a
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case DW_OP_div:
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s->PutCString("DW_OP_div");
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break; // 0x1b
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case DW_OP_minus:
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s->PutCString("DW_OP_minus");
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break; // 0x1c
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case DW_OP_mod:
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s->PutCString("DW_OP_mod");
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break; // 0x1d
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case DW_OP_mul:
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s->PutCString("DW_OP_mul");
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break; // 0x1e
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case DW_OP_neg:
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s->PutCString("DW_OP_neg");
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break; // 0x1f
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case DW_OP_not:
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s->PutCString("DW_OP_not");
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break; // 0x20
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case DW_OP_or:
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s->PutCString("DW_OP_or");
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break; // 0x21
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case DW_OP_plus:
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s->PutCString("DW_OP_plus");
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break; // 0x22
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case DW_OP_plus_uconst: // 0x23 1 ULEB128 addend
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s->Printf("DW_OP_plus_uconst(0x%" PRIx64 ")",
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m_data.GetULEB128(&offset));
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break;
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case DW_OP_shl:
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s->PutCString("DW_OP_shl");
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break; // 0x24
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case DW_OP_shr:
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s->PutCString("DW_OP_shr");
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break; // 0x25
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case DW_OP_shra:
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s->PutCString("DW_OP_shra");
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break; // 0x26
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case DW_OP_xor:
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s->PutCString("DW_OP_xor");
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break; // 0x27
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case DW_OP_skip:
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s->Printf("DW_OP_skip(0x%4.4x)", m_data.GetU16(&offset));
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break; // 0x2f 1 signed 2-byte constant
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case DW_OP_bra:
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s->Printf("DW_OP_bra(0x%4.4x)", m_data.GetU16(&offset));
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break; // 0x28 1 signed 2-byte constant
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case DW_OP_eq:
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s->PutCString("DW_OP_eq");
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break; // 0x29
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case DW_OP_ge:
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s->PutCString("DW_OP_ge");
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break; // 0x2a
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case DW_OP_gt:
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s->PutCString("DW_OP_gt");
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break; // 0x2b
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case DW_OP_le:
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s->PutCString("DW_OP_le");
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break; // 0x2c
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case DW_OP_lt:
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s->PutCString("DW_OP_lt");
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break; // 0x2d
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case DW_OP_ne:
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s->PutCString("DW_OP_ne");
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break; // 0x2e
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case DW_OP_lit0: // 0x30
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case DW_OP_lit1: // 0x31
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case DW_OP_lit2: // 0x32
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case DW_OP_lit3: // 0x33
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case DW_OP_lit4: // 0x34
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case DW_OP_lit5: // 0x35
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case DW_OP_lit6: // 0x36
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case DW_OP_lit7: // 0x37
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case DW_OP_lit8: // 0x38
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case DW_OP_lit9: // 0x39
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case DW_OP_lit10: // 0x3A
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case DW_OP_lit11: // 0x3B
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case DW_OP_lit12: // 0x3C
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case DW_OP_lit13: // 0x3D
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case DW_OP_lit14: // 0x3E
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case DW_OP_lit15: // 0x3F
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case DW_OP_lit16: // 0x40
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case DW_OP_lit17: // 0x41
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case DW_OP_lit18: // 0x42
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case DW_OP_lit19: // 0x43
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case DW_OP_lit20: // 0x44
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case DW_OP_lit21: // 0x45
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case DW_OP_lit22: // 0x46
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case DW_OP_lit23: // 0x47
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case DW_OP_lit24: // 0x48
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case DW_OP_lit25: // 0x49
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case DW_OP_lit26: // 0x4A
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case DW_OP_lit27: // 0x4B
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case DW_OP_lit28: // 0x4C
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case DW_OP_lit29: // 0x4D
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case DW_OP_lit30: // 0x4E
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case DW_OP_lit31:
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s->Printf("DW_OP_lit%i", op - DW_OP_lit0);
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break; // 0x4f
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case DW_OP_reg0: // 0x50
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case DW_OP_reg1: // 0x51
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case DW_OP_reg2: // 0x52
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case DW_OP_reg3: // 0x53
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case DW_OP_reg4: // 0x54
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case DW_OP_reg5: // 0x55
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case DW_OP_reg6: // 0x56
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case DW_OP_reg7: // 0x57
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case DW_OP_reg8: // 0x58
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case DW_OP_reg9: // 0x59
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case DW_OP_reg10: // 0x5A
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case DW_OP_reg11: // 0x5B
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case DW_OP_reg12: // 0x5C
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case DW_OP_reg13: // 0x5D
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case DW_OP_reg14: // 0x5E
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case DW_OP_reg15: // 0x5F
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case DW_OP_reg16: // 0x60
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case DW_OP_reg17: // 0x61
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case DW_OP_reg18: // 0x62
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case DW_OP_reg19: // 0x63
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case DW_OP_reg20: // 0x64
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case DW_OP_reg21: // 0x65
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case DW_OP_reg22: // 0x66
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case DW_OP_reg23: // 0x67
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case DW_OP_reg24: // 0x68
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case DW_OP_reg25: // 0x69
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case DW_OP_reg26: // 0x6A
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case DW_OP_reg27: // 0x6B
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case DW_OP_reg28: // 0x6C
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case DW_OP_reg29: // 0x6D
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case DW_OP_reg30: // 0x6E
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case DW_OP_reg31: // 0x6F
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{
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uint32_t reg_num = op - DW_OP_reg0;
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if (abi) {
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RegisterInfo reg_info;
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if (abi->GetRegisterInfoByKind(m_reg_kind, reg_num, reg_info)) {
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if (reg_info.name) {
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s->PutCString(reg_info.name);
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break;
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} else if (reg_info.alt_name) {
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s->PutCString(reg_info.alt_name);
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break;
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}
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}
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}
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s->Printf("DW_OP_reg%u", reg_num);
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break;
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} break;
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case DW_OP_breg0:
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case DW_OP_breg1:
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case DW_OP_breg2:
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case DW_OP_breg3:
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case DW_OP_breg4:
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case DW_OP_breg5:
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case DW_OP_breg6:
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case DW_OP_breg7:
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case DW_OP_breg8:
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case DW_OP_breg9:
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case DW_OP_breg10:
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case DW_OP_breg11:
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case DW_OP_breg12:
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case DW_OP_breg13:
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case DW_OP_breg14:
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case DW_OP_breg15:
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case DW_OP_breg16:
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case DW_OP_breg17:
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case DW_OP_breg18:
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case DW_OP_breg19:
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case DW_OP_breg20:
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case DW_OP_breg21:
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case DW_OP_breg22:
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case DW_OP_breg23:
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case DW_OP_breg24:
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case DW_OP_breg25:
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case DW_OP_breg26:
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case DW_OP_breg27:
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case DW_OP_breg28:
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case DW_OP_breg29:
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case DW_OP_breg30:
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case DW_OP_breg31: {
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uint32_t reg_num = op - DW_OP_breg0;
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int64_t reg_offset = m_data.GetSLEB128(&offset);
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if (abi) {
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RegisterInfo reg_info;
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if (abi->GetRegisterInfoByKind(m_reg_kind, reg_num, reg_info)) {
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if (reg_info.name) {
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s->Printf("[%s%+" PRIi64 "]", reg_info.name, reg_offset);
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break;
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} else if (reg_info.alt_name) {
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s->Printf("[%s%+" PRIi64 "]", reg_info.alt_name, reg_offset);
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break;
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}
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}
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}
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s->Printf("DW_OP_breg%i(0x%" PRIx64 ")", reg_num, reg_offset);
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} break;
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||
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||
case DW_OP_regx: // 0x90 1 ULEB128 register
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{
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uint32_t reg_num = m_data.GetULEB128(&offset);
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if (abi) {
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RegisterInfo reg_info;
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if (abi->GetRegisterInfoByKind(m_reg_kind, reg_num, reg_info)) {
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if (reg_info.name) {
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s->PutCString(reg_info.name);
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break;
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} else if (reg_info.alt_name) {
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s->PutCString(reg_info.alt_name);
|
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break;
|
||
}
|
||
}
|
||
}
|
||
s->Printf("DW_OP_regx(%" PRIu32 ")", reg_num);
|
||
break;
|
||
} break;
|
||
case DW_OP_fbreg: // 0x91 1 SLEB128 offset
|
||
s->Printf("DW_OP_fbreg(%" PRIi64 ")", m_data.GetSLEB128(&offset));
|
||
break;
|
||
case DW_OP_bregx: // 0x92 2 ULEB128 register followed by SLEB128 offset
|
||
{
|
||
uint32_t reg_num = m_data.GetULEB128(&offset);
|
||
int64_t reg_offset = m_data.GetSLEB128(&offset);
|
||
if (abi) {
|
||
RegisterInfo reg_info;
|
||
if (abi->GetRegisterInfoByKind(m_reg_kind, reg_num, reg_info)) {
|
||
if (reg_info.name) {
|
||
s->Printf("[%s%+" PRIi64 "]", reg_info.name, reg_offset);
|
||
break;
|
||
} else if (reg_info.alt_name) {
|
||
s->Printf("[%s%+" PRIi64 "]", reg_info.alt_name, reg_offset);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
s->Printf("DW_OP_bregx(reg=%" PRIu32 ",offset=%" PRIi64 ")", reg_num,
|
||
reg_offset);
|
||
} break;
|
||
case DW_OP_piece: // 0x93 1 ULEB128 size of piece addressed
|
||
s->Printf("DW_OP_piece(0x%" PRIx64 ")", m_data.GetULEB128(&offset));
|
||
break;
|
||
case DW_OP_deref_size: // 0x94 1 1-byte size of data retrieved
|
||
s->Printf("DW_OP_deref_size(0x%2.2x)", m_data.GetU8(&offset));
|
||
break;
|
||
case DW_OP_xderef_size: // 0x95 1 1-byte size of data retrieved
|
||
s->Printf("DW_OP_xderef_size(0x%2.2x)", m_data.GetU8(&offset));
|
||
break;
|
||
case DW_OP_nop:
|
||
s->PutCString("DW_OP_nop");
|
||
break; // 0x96
|
||
case DW_OP_push_object_address:
|
||
s->PutCString("DW_OP_push_object_address");
|
||
break; // 0x97 DWARF3
|
||
case DW_OP_call2: // 0x98 DWARF3 1 2-byte offset of DIE
|
||
s->Printf("DW_OP_call2(0x%4.4x)", m_data.GetU16(&offset));
|
||
break;
|
||
case DW_OP_call4: // 0x99 DWARF3 1 4-byte offset of DIE
|
||
s->Printf("DW_OP_call4(0x%8.8x)", m_data.GetU32(&offset));
|
||
break;
|
||
case DW_OP_call_ref: // 0x9a DWARF3 1 4- or 8-byte offset of DIE
|
||
s->Printf("DW_OP_call_ref(0x%8.8" PRIx64 ")", m_data.GetAddress(&offset));
|
||
break;
|
||
// case DW_OP_call_frame_cfa: s << "call_frame_cfa"; break;
|
||
// // 0x9c DWARF3
|
||
// case DW_OP_bit_piece: // 0x9d DWARF3 2
|
||
// s->Printf("DW_OP_bit_piece(0x%x, 0x%x)",
|
||
// m_data.GetULEB128(&offset), m_data.GetULEB128(&offset));
|
||
// break;
|
||
// case DW_OP_lo_user: s->PutCString("DW_OP_lo_user"); break;
|
||
// // 0xe0
|
||
// case DW_OP_hi_user: s->PutCString("DW_OP_hi_user"); break;
|
||
// // 0xff
|
||
// case DW_OP_APPLE_extern:
|
||
// s->Printf("DW_OP_APPLE_extern(%" PRIu64 ")",
|
||
// m_data.GetULEB128(&offset));
|
||
// break;
|
||
// case DW_OP_APPLE_array_ref:
|
||
// s->PutCString("DW_OP_APPLE_array_ref");
|
||
// break;
|
||
case DW_OP_form_tls_address:
|
||
s->PutCString("DW_OP_form_tls_address"); // 0x9b
|
||
break;
|
||
case DW_OP_GNU_addr_index: // 0xfb
|
||
s->Printf("DW_OP_GNU_addr_index(0x%" PRIx64 ")",
|
||
m_data.GetULEB128(&offset));
|
||
break;
|
||
case DW_OP_GNU_const_index: // 0xfc
|
||
s->Printf("DW_OP_GNU_const_index(0x%" PRIx64 ")",
|
||
m_data.GetULEB128(&offset));
|
||
break;
|
||
case DW_OP_GNU_push_tls_address:
|
||
s->PutCString("DW_OP_GNU_push_tls_address"); // 0xe0
|
||
break;
|
||
case DW_OP_APPLE_uninit:
|
||
s->PutCString("DW_OP_APPLE_uninit"); // 0xF0
|
||
break;
|
||
// case DW_OP_APPLE_assign: // 0xF1 - pops value off and
|
||
// assigns it to second item on stack (2nd item must have
|
||
// assignable context)
|
||
// s->PutCString("DW_OP_APPLE_assign");
|
||
// break;
|
||
// case DW_OP_APPLE_address_of: // 0xF2 - gets the address of
|
||
// the top stack item (top item must be a variable, or have
|
||
// value_type that is an address already)
|
||
// s->PutCString("DW_OP_APPLE_address_of");
|
||
// break;
|
||
// case DW_OP_APPLE_value_of: // 0xF3 - pops the value off the
|
||
// stack and pushes the value of that object (top item must be a
|
||
// variable, or expression local)
|
||
// s->PutCString("DW_OP_APPLE_value_of");
|
||
// break;
|
||
// case DW_OP_APPLE_deref_type: // 0xF4 - gets the address of
|
||
// the top stack item (top item must be a variable, or a clang
|
||
// type)
|
||
// s->PutCString("DW_OP_APPLE_deref_type");
|
||
// break;
|
||
// case DW_OP_APPLE_expr_local: // 0xF5 - ULEB128 expression
|
||
// local index
|
||
// s->Printf("DW_OP_APPLE_expr_local(%" PRIu64 ")",
|
||
// m_data.GetULEB128(&offset));
|
||
// break;
|
||
// case DW_OP_APPLE_constf: // 0xF6 - 1 byte float size,
|
||
// followed by constant float data
|
||
// {
|
||
// uint8_t float_length = m_data.GetU8(&offset);
|
||
// s->Printf("DW_OP_APPLE_constf(<%u> ", float_length);
|
||
// m_data.Dump(s, offset, eFormatHex, float_length, 1,
|
||
// UINT32_MAX, DW_INVALID_ADDRESS, 0, 0);
|
||
// s->PutChar(')');
|
||
// // Consume the float data
|
||
// m_data.GetData(&offset, float_length);
|
||
// }
|
||
// break;
|
||
// case DW_OP_APPLE_scalar_cast:
|
||
// s->Printf("DW_OP_APPLE_scalar_cast(%s)",
|
||
// Scalar::GetValueTypeAsCString
|
||
// ((Scalar::Type)m_data.GetU8(&offset)));
|
||
// break;
|
||
// case DW_OP_APPLE_clang_cast:
|
||
// {
|
||
// clang::Type *clang_type = (clang::Type
|
||
// *)m_data.GetMaxU64(&offset, sizeof(void*));
|
||
// s->Printf("DW_OP_APPLE_clang_cast(%p)", clang_type);
|
||
// }
|
||
// break;
|
||
// case DW_OP_APPLE_clear:
|
||
// s->PutCString("DW_OP_APPLE_clear");
|
||
// break;
|
||
// case DW_OP_APPLE_error: // 0xFF - Stops expression
|
||
// evaluation and returns an error (no args)
|
||
// s->PutCString("DW_OP_APPLE_error");
|
||
// break;
|
||
}
|
||
}
|
||
}
|
||
|
||
void DWARFExpression::SetLocationListSlide(addr_t slide) {
|
||
m_loclist_slide = slide;
|
||
}
|
||
|
||
int DWARFExpression::GetRegisterKind() { return m_reg_kind; }
|
||
|
||
void DWARFExpression::SetRegisterKind(RegisterKind reg_kind) {
|
||
m_reg_kind = reg_kind;
|
||
}
|
||
|
||
bool DWARFExpression::IsLocationList() const {
|
||
return m_loclist_slide != LLDB_INVALID_ADDRESS;
|
||
}
|
||
|
||
void DWARFExpression::GetDescription(Stream *s, lldb::DescriptionLevel level,
|
||
addr_t location_list_base_addr,
|
||
ABI *abi) const {
|
||
if (IsLocationList()) {
|
||
// We have a location list
|
||
lldb::offset_t offset = 0;
|
||
uint32_t count = 0;
|
||
addr_t curr_base_addr = location_list_base_addr;
|
||
while (m_data.ValidOffset(offset)) {
|
||
addr_t begin_addr_offset = LLDB_INVALID_ADDRESS;
|
||
addr_t end_addr_offset = LLDB_INVALID_ADDRESS;
|
||
if (!AddressRangeForLocationListEntry(m_dwarf_cu, m_data, &offset,
|
||
begin_addr_offset, end_addr_offset))
|
||
break;
|
||
|
||
if (begin_addr_offset == 0 && end_addr_offset == 0)
|
||
break;
|
||
|
||
if (begin_addr_offset < end_addr_offset) {
|
||
if (count > 0)
|
||
s->PutCString(", ");
|
||
VMRange addr_range(curr_base_addr + begin_addr_offset,
|
||
curr_base_addr + end_addr_offset);
|
||
addr_range.Dump(s, 0, 8);
|
||
s->PutChar('{');
|
||
lldb::offset_t location_length = m_data.GetU16(&offset);
|
||
DumpLocation(s, offset, location_length, level, abi);
|
||
s->PutChar('}');
|
||
offset += location_length;
|
||
} else {
|
||
if ((m_data.GetAddressByteSize() == 4 &&
|
||
(begin_addr_offset == UINT32_MAX)) ||
|
||
(m_data.GetAddressByteSize() == 8 &&
|
||
(begin_addr_offset == UINT64_MAX))) {
|
||
curr_base_addr = end_addr_offset + location_list_base_addr;
|
||
// We have a new base address
|
||
if (count > 0)
|
||
s->PutCString(", ");
|
||
*s << "base_addr = " << end_addr_offset;
|
||
}
|
||
}
|
||
|
||
count++;
|
||
}
|
||
} else {
|
||
// We have a normal location that contains DW_OP location opcodes
|
||
DumpLocation(s, 0, m_data.GetByteSize(), level, abi);
|
||
}
|
||
}
|
||
|
||
static bool ReadRegisterValueAsScalar(RegisterContext *reg_ctx,
|
||
lldb::RegisterKind reg_kind,
|
||
uint32_t reg_num, Status *error_ptr,
|
||
Value &value) {
|
||
if (reg_ctx == NULL) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat("No register context in frame.\n");
|
||
} else {
|
||
uint32_t native_reg =
|
||
reg_ctx->ConvertRegisterKindToRegisterNumber(reg_kind, reg_num);
|
||
if (native_reg == LLDB_INVALID_REGNUM) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat("Unable to convert register "
|
||
"kind=%u reg_num=%u to a native "
|
||
"register number.\n",
|
||
reg_kind, reg_num);
|
||
} else {
|
||
const RegisterInfo *reg_info =
|
||
reg_ctx->GetRegisterInfoAtIndex(native_reg);
|
||
RegisterValue reg_value;
|
||
if (reg_ctx->ReadRegister(reg_info, reg_value)) {
|
||
if (reg_value.GetScalarValue(value.GetScalar())) {
|
||
value.SetValueType(Value::eValueTypeScalar);
|
||
value.SetContext(Value::eContextTypeRegisterInfo,
|
||
const_cast<RegisterInfo *>(reg_info));
|
||
if (error_ptr)
|
||
error_ptr->Clear();
|
||
return true;
|
||
} else {
|
||
// If we get this error, then we need to implement a value buffer in
|
||
// the dwarf expression evaluation function...
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"register %s can't be converted to a scalar value",
|
||
reg_info->name);
|
||
}
|
||
} else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat("register %s is not available",
|
||
reg_info->name);
|
||
}
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
// bool
|
||
// DWARFExpression::LocationListContainsLoadAddress (Process* process, const
|
||
// Address &addr) const
|
||
//{
|
||
// return LocationListContainsLoadAddress(process,
|
||
// addr.GetLoadAddress(process));
|
||
//}
|
||
//
|
||
// bool
|
||
// DWARFExpression::LocationListContainsLoadAddress (Process* process, addr_t
|
||
// load_addr) const
|
||
//{
|
||
// if (load_addr == LLDB_INVALID_ADDRESS)
|
||
// return false;
|
||
//
|
||
// if (IsLocationList())
|
||
// {
|
||
// lldb::offset_t offset = 0;
|
||
//
|
||
// addr_t loc_list_base_addr = m_loclist_slide.GetLoadAddress(process);
|
||
//
|
||
// if (loc_list_base_addr == LLDB_INVALID_ADDRESS)
|
||
// return false;
|
||
//
|
||
// while (m_data.ValidOffset(offset))
|
||
// {
|
||
// // We need to figure out what the value is for the location.
|
||
// addr_t lo_pc = m_data.GetAddress(&offset);
|
||
// addr_t hi_pc = m_data.GetAddress(&offset);
|
||
// if (lo_pc == 0 && hi_pc == 0)
|
||
// break;
|
||
// else
|
||
// {
|
||
// lo_pc += loc_list_base_addr;
|
||
// hi_pc += loc_list_base_addr;
|
||
//
|
||
// if (lo_pc <= load_addr && load_addr < hi_pc)
|
||
// return true;
|
||
//
|
||
// offset += m_data.GetU16(&offset);
|
||
// }
|
||
// }
|
||
// }
|
||
// return false;
|
||
//}
|
||
|
||
static offset_t GetOpcodeDataSize(const DataExtractor &data,
|
||
const lldb::offset_t data_offset,
|
||
const uint8_t op) {
|
||
lldb::offset_t offset = data_offset;
|
||
switch (op) {
|
||
case DW_OP_addr:
|
||
case DW_OP_call_ref: // 0x9a 1 address sized offset of DIE (DWARF3)
|
||
return data.GetAddressByteSize();
|
||
|
||
// Opcodes with no arguments
|
||
case DW_OP_deref: // 0x06
|
||
case DW_OP_dup: // 0x12
|
||
case DW_OP_drop: // 0x13
|
||
case DW_OP_over: // 0x14
|
||
case DW_OP_swap: // 0x16
|
||
case DW_OP_rot: // 0x17
|
||
case DW_OP_xderef: // 0x18
|
||
case DW_OP_abs: // 0x19
|
||
case DW_OP_and: // 0x1a
|
||
case DW_OP_div: // 0x1b
|
||
case DW_OP_minus: // 0x1c
|
||
case DW_OP_mod: // 0x1d
|
||
case DW_OP_mul: // 0x1e
|
||
case DW_OP_neg: // 0x1f
|
||
case DW_OP_not: // 0x20
|
||
case DW_OP_or: // 0x21
|
||
case DW_OP_plus: // 0x22
|
||
case DW_OP_shl: // 0x24
|
||
case DW_OP_shr: // 0x25
|
||
case DW_OP_shra: // 0x26
|
||
case DW_OP_xor: // 0x27
|
||
case DW_OP_eq: // 0x29
|
||
case DW_OP_ge: // 0x2a
|
||
case DW_OP_gt: // 0x2b
|
||
case DW_OP_le: // 0x2c
|
||
case DW_OP_lt: // 0x2d
|
||
case DW_OP_ne: // 0x2e
|
||
case DW_OP_lit0: // 0x30
|
||
case DW_OP_lit1: // 0x31
|
||
case DW_OP_lit2: // 0x32
|
||
case DW_OP_lit3: // 0x33
|
||
case DW_OP_lit4: // 0x34
|
||
case DW_OP_lit5: // 0x35
|
||
case DW_OP_lit6: // 0x36
|
||
case DW_OP_lit7: // 0x37
|
||
case DW_OP_lit8: // 0x38
|
||
case DW_OP_lit9: // 0x39
|
||
case DW_OP_lit10: // 0x3A
|
||
case DW_OP_lit11: // 0x3B
|
||
case DW_OP_lit12: // 0x3C
|
||
case DW_OP_lit13: // 0x3D
|
||
case DW_OP_lit14: // 0x3E
|
||
case DW_OP_lit15: // 0x3F
|
||
case DW_OP_lit16: // 0x40
|
||
case DW_OP_lit17: // 0x41
|
||
case DW_OP_lit18: // 0x42
|
||
case DW_OP_lit19: // 0x43
|
||
case DW_OP_lit20: // 0x44
|
||
case DW_OP_lit21: // 0x45
|
||
case DW_OP_lit22: // 0x46
|
||
case DW_OP_lit23: // 0x47
|
||
case DW_OP_lit24: // 0x48
|
||
case DW_OP_lit25: // 0x49
|
||
case DW_OP_lit26: // 0x4A
|
||
case DW_OP_lit27: // 0x4B
|
||
case DW_OP_lit28: // 0x4C
|
||
case DW_OP_lit29: // 0x4D
|
||
case DW_OP_lit30: // 0x4E
|
||
case DW_OP_lit31: // 0x4f
|
||
case DW_OP_reg0: // 0x50
|
||
case DW_OP_reg1: // 0x51
|
||
case DW_OP_reg2: // 0x52
|
||
case DW_OP_reg3: // 0x53
|
||
case DW_OP_reg4: // 0x54
|
||
case DW_OP_reg5: // 0x55
|
||
case DW_OP_reg6: // 0x56
|
||
case DW_OP_reg7: // 0x57
|
||
case DW_OP_reg8: // 0x58
|
||
case DW_OP_reg9: // 0x59
|
||
case DW_OP_reg10: // 0x5A
|
||
case DW_OP_reg11: // 0x5B
|
||
case DW_OP_reg12: // 0x5C
|
||
case DW_OP_reg13: // 0x5D
|
||
case DW_OP_reg14: // 0x5E
|
||
case DW_OP_reg15: // 0x5F
|
||
case DW_OP_reg16: // 0x60
|
||
case DW_OP_reg17: // 0x61
|
||
case DW_OP_reg18: // 0x62
|
||
case DW_OP_reg19: // 0x63
|
||
case DW_OP_reg20: // 0x64
|
||
case DW_OP_reg21: // 0x65
|
||
case DW_OP_reg22: // 0x66
|
||
case DW_OP_reg23: // 0x67
|
||
case DW_OP_reg24: // 0x68
|
||
case DW_OP_reg25: // 0x69
|
||
case DW_OP_reg26: // 0x6A
|
||
case DW_OP_reg27: // 0x6B
|
||
case DW_OP_reg28: // 0x6C
|
||
case DW_OP_reg29: // 0x6D
|
||
case DW_OP_reg30: // 0x6E
|
||
case DW_OP_reg31: // 0x6F
|
||
case DW_OP_nop: // 0x96
|
||
case DW_OP_push_object_address: // 0x97 DWARF3
|
||
case DW_OP_form_tls_address: // 0x9b DWARF3
|
||
case DW_OP_call_frame_cfa: // 0x9c DWARF3
|
||
case DW_OP_stack_value: // 0x9f DWARF4
|
||
case DW_OP_GNU_push_tls_address: // 0xe0 GNU extension
|
||
return 0;
|
||
|
||
// Opcodes with a single 1 byte arguments
|
||
case DW_OP_const1u: // 0x08 1 1-byte constant
|
||
case DW_OP_const1s: // 0x09 1 1-byte constant
|
||
case DW_OP_pick: // 0x15 1 1-byte stack index
|
||
case DW_OP_deref_size: // 0x94 1 1-byte size of data retrieved
|
||
case DW_OP_xderef_size: // 0x95 1 1-byte size of data retrieved
|
||
return 1;
|
||
|
||
// Opcodes with a single 2 byte arguments
|
||
case DW_OP_const2u: // 0x0a 1 2-byte constant
|
||
case DW_OP_const2s: // 0x0b 1 2-byte constant
|
||
case DW_OP_skip: // 0x2f 1 signed 2-byte constant
|
||
case DW_OP_bra: // 0x28 1 signed 2-byte constant
|
||
case DW_OP_call2: // 0x98 1 2-byte offset of DIE (DWARF3)
|
||
return 2;
|
||
|
||
// Opcodes with a single 4 byte arguments
|
||
case DW_OP_const4u: // 0x0c 1 4-byte constant
|
||
case DW_OP_const4s: // 0x0d 1 4-byte constant
|
||
case DW_OP_call4: // 0x99 1 4-byte offset of DIE (DWARF3)
|
||
return 4;
|
||
|
||
// Opcodes with a single 8 byte arguments
|
||
case DW_OP_const8u: // 0x0e 1 8-byte constant
|
||
case DW_OP_const8s: // 0x0f 1 8-byte constant
|
||
return 8;
|
||
|
||
// All opcodes that have a single ULEB (signed or unsigned) argument
|
||
case DW_OP_constu: // 0x10 1 ULEB128 constant
|
||
case DW_OP_consts: // 0x11 1 SLEB128 constant
|
||
case DW_OP_plus_uconst: // 0x23 1 ULEB128 addend
|
||
case DW_OP_breg0: // 0x70 1 ULEB128 register
|
||
case DW_OP_breg1: // 0x71 1 ULEB128 register
|
||
case DW_OP_breg2: // 0x72 1 ULEB128 register
|
||
case DW_OP_breg3: // 0x73 1 ULEB128 register
|
||
case DW_OP_breg4: // 0x74 1 ULEB128 register
|
||
case DW_OP_breg5: // 0x75 1 ULEB128 register
|
||
case DW_OP_breg6: // 0x76 1 ULEB128 register
|
||
case DW_OP_breg7: // 0x77 1 ULEB128 register
|
||
case DW_OP_breg8: // 0x78 1 ULEB128 register
|
||
case DW_OP_breg9: // 0x79 1 ULEB128 register
|
||
case DW_OP_breg10: // 0x7a 1 ULEB128 register
|
||
case DW_OP_breg11: // 0x7b 1 ULEB128 register
|
||
case DW_OP_breg12: // 0x7c 1 ULEB128 register
|
||
case DW_OP_breg13: // 0x7d 1 ULEB128 register
|
||
case DW_OP_breg14: // 0x7e 1 ULEB128 register
|
||
case DW_OP_breg15: // 0x7f 1 ULEB128 register
|
||
case DW_OP_breg16: // 0x80 1 ULEB128 register
|
||
case DW_OP_breg17: // 0x81 1 ULEB128 register
|
||
case DW_OP_breg18: // 0x82 1 ULEB128 register
|
||
case DW_OP_breg19: // 0x83 1 ULEB128 register
|
||
case DW_OP_breg20: // 0x84 1 ULEB128 register
|
||
case DW_OP_breg21: // 0x85 1 ULEB128 register
|
||
case DW_OP_breg22: // 0x86 1 ULEB128 register
|
||
case DW_OP_breg23: // 0x87 1 ULEB128 register
|
||
case DW_OP_breg24: // 0x88 1 ULEB128 register
|
||
case DW_OP_breg25: // 0x89 1 ULEB128 register
|
||
case DW_OP_breg26: // 0x8a 1 ULEB128 register
|
||
case DW_OP_breg27: // 0x8b 1 ULEB128 register
|
||
case DW_OP_breg28: // 0x8c 1 ULEB128 register
|
||
case DW_OP_breg29: // 0x8d 1 ULEB128 register
|
||
case DW_OP_breg30: // 0x8e 1 ULEB128 register
|
||
case DW_OP_breg31: // 0x8f 1 ULEB128 register
|
||
case DW_OP_regx: // 0x90 1 ULEB128 register
|
||
case DW_OP_fbreg: // 0x91 1 SLEB128 offset
|
||
case DW_OP_piece: // 0x93 1 ULEB128 size of piece addressed
|
||
case DW_OP_GNU_addr_index: // 0xfb 1 ULEB128 index
|
||
case DW_OP_GNU_const_index: // 0xfc 1 ULEB128 index
|
||
data.Skip_LEB128(&offset);
|
||
return offset - data_offset;
|
||
|
||
// All opcodes that have a 2 ULEB (signed or unsigned) arguments
|
||
case DW_OP_bregx: // 0x92 2 ULEB128 register followed by SLEB128 offset
|
||
case DW_OP_bit_piece: // 0x9d ULEB128 bit size, ULEB128 bit offset (DWARF3);
|
||
data.Skip_LEB128(&offset);
|
||
data.Skip_LEB128(&offset);
|
||
return offset - data_offset;
|
||
|
||
case DW_OP_implicit_value: // 0x9e ULEB128 size followed by block of that size
|
||
// (DWARF4)
|
||
{
|
||
uint64_t block_len = data.Skip_LEB128(&offset);
|
||
offset += block_len;
|
||
return offset - data_offset;
|
||
}
|
||
|
||
default:
|
||
break;
|
||
}
|
||
return LLDB_INVALID_OFFSET;
|
||
}
|
||
|
||
lldb::addr_t DWARFExpression::GetLocation_DW_OP_addr(uint32_t op_addr_idx,
|
||
bool &error) const {
|
||
error = false;
|
||
if (IsLocationList())
|
||
return LLDB_INVALID_ADDRESS;
|
||
lldb::offset_t offset = 0;
|
||
uint32_t curr_op_addr_idx = 0;
|
||
while (m_data.ValidOffset(offset)) {
|
||
const uint8_t op = m_data.GetU8(&offset);
|
||
|
||
if (op == DW_OP_addr) {
|
||
const lldb::addr_t op_file_addr = m_data.GetAddress(&offset);
|
||
if (curr_op_addr_idx == op_addr_idx)
|
||
return op_file_addr;
|
||
else
|
||
++curr_op_addr_idx;
|
||
} else if (op == DW_OP_GNU_addr_index) {
|
||
uint64_t index = m_data.GetULEB128(&offset);
|
||
if (curr_op_addr_idx == op_addr_idx) {
|
||
if (!m_dwarf_cu) {
|
||
error = true;
|
||
break;
|
||
}
|
||
|
||
return ReadAddressFromDebugAddrSection(m_dwarf_cu, index);
|
||
} else
|
||
++curr_op_addr_idx;
|
||
} else {
|
||
const offset_t op_arg_size = GetOpcodeDataSize(m_data, offset, op);
|
||
if (op_arg_size == LLDB_INVALID_OFFSET) {
|
||
error = true;
|
||
break;
|
||
}
|
||
offset += op_arg_size;
|
||
}
|
||
}
|
||
return LLDB_INVALID_ADDRESS;
|
||
}
|
||
|
||
bool DWARFExpression::Update_DW_OP_addr(lldb::addr_t file_addr) {
|
||
if (IsLocationList())
|
||
return false;
|
||
lldb::offset_t offset = 0;
|
||
while (m_data.ValidOffset(offset)) {
|
||
const uint8_t op = m_data.GetU8(&offset);
|
||
|
||
if (op == DW_OP_addr) {
|
||
const uint32_t addr_byte_size = m_data.GetAddressByteSize();
|
||
// We have to make a copy of the data as we don't know if this data is
|
||
// from a read only memory mapped buffer, so we duplicate all of the data
|
||
// first, then modify it, and if all goes well, we then replace the data
|
||
// for this expression
|
||
|
||
// So first we copy the data into a heap buffer
|
||
std::unique_ptr<DataBufferHeap> head_data_ap(
|
||
new DataBufferHeap(m_data.GetDataStart(), m_data.GetByteSize()));
|
||
|
||
// Make en encoder so we can write the address into the buffer using the
|
||
// correct byte order (endianness)
|
||
DataEncoder encoder(head_data_ap->GetBytes(), head_data_ap->GetByteSize(),
|
||
m_data.GetByteOrder(), addr_byte_size);
|
||
|
||
// Replace the address in the new buffer
|
||
if (encoder.PutMaxU64(offset, addr_byte_size, file_addr) == UINT32_MAX)
|
||
return false;
|
||
|
||
// All went well, so now we can reset the data using a shared pointer to
|
||
// the heap data so "m_data" will now correctly manage the heap data.
|
||
m_data.SetData(DataBufferSP(head_data_ap.release()));
|
||
return true;
|
||
} else {
|
||
const offset_t op_arg_size = GetOpcodeDataSize(m_data, offset, op);
|
||
if (op_arg_size == LLDB_INVALID_OFFSET)
|
||
break;
|
||
offset += op_arg_size;
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
bool DWARFExpression::ContainsThreadLocalStorage() const {
|
||
// We are assuming for now that any thread local variable will not have a
|
||
// location list. This has been true for all thread local variables we have
|
||
// seen so far produced by any compiler.
|
||
if (IsLocationList())
|
||
return false;
|
||
lldb::offset_t offset = 0;
|
||
while (m_data.ValidOffset(offset)) {
|
||
const uint8_t op = m_data.GetU8(&offset);
|
||
|
||
if (op == DW_OP_form_tls_address || op == DW_OP_GNU_push_tls_address)
|
||
return true;
|
||
const offset_t op_arg_size = GetOpcodeDataSize(m_data, offset, op);
|
||
if (op_arg_size == LLDB_INVALID_OFFSET)
|
||
return false;
|
||
else
|
||
offset += op_arg_size;
|
||
}
|
||
return false;
|
||
}
|
||
bool DWARFExpression::LinkThreadLocalStorage(
|
||
lldb::ModuleSP new_module_sp,
|
||
std::function<lldb::addr_t(lldb::addr_t file_addr)> const
|
||
&link_address_callback) {
|
||
// We are assuming for now that any thread local variable will not have a
|
||
// location list. This has been true for all thread local variables we have
|
||
// seen so far produced by any compiler.
|
||
if (IsLocationList())
|
||
return false;
|
||
|
||
const uint32_t addr_byte_size = m_data.GetAddressByteSize();
|
||
// We have to make a copy of the data as we don't know if this data is from a
|
||
// read only memory mapped buffer, so we duplicate all of the data first,
|
||
// then modify it, and if all goes well, we then replace the data for this
|
||
// expression
|
||
|
||
// So first we copy the data into a heap buffer
|
||
std::shared_ptr<DataBufferHeap> heap_data_sp(
|
||
new DataBufferHeap(m_data.GetDataStart(), m_data.GetByteSize()));
|
||
|
||
// Make en encoder so we can write the address into the buffer using the
|
||
// correct byte order (endianness)
|
||
DataEncoder encoder(heap_data_sp->GetBytes(), heap_data_sp->GetByteSize(),
|
||
m_data.GetByteOrder(), addr_byte_size);
|
||
|
||
lldb::offset_t offset = 0;
|
||
lldb::offset_t const_offset = 0;
|
||
lldb::addr_t const_value = 0;
|
||
size_t const_byte_size = 0;
|
||
while (m_data.ValidOffset(offset)) {
|
||
const uint8_t op = m_data.GetU8(&offset);
|
||
|
||
bool decoded_data = false;
|
||
switch (op) {
|
||
case DW_OP_const4u:
|
||
// Remember the const offset in case we later have a
|
||
// DW_OP_form_tls_address or DW_OP_GNU_push_tls_address
|
||
const_offset = offset;
|
||
const_value = m_data.GetU32(&offset);
|
||
decoded_data = true;
|
||
const_byte_size = 4;
|
||
break;
|
||
|
||
case DW_OP_const8u:
|
||
// Remember the const offset in case we later have a
|
||
// DW_OP_form_tls_address or DW_OP_GNU_push_tls_address
|
||
const_offset = offset;
|
||
const_value = m_data.GetU64(&offset);
|
||
decoded_data = true;
|
||
const_byte_size = 8;
|
||
break;
|
||
|
||
case DW_OP_form_tls_address:
|
||
case DW_OP_GNU_push_tls_address:
|
||
// DW_OP_form_tls_address and DW_OP_GNU_push_tls_address must be preceded
|
||
// by a file address on the stack. We assume that DW_OP_const4u or
|
||
// DW_OP_const8u is used for these values, and we check that the last
|
||
// opcode we got before either of these was DW_OP_const4u or
|
||
// DW_OP_const8u. If so, then we can link the value accodingly. For
|
||
// Darwin, the value in the DW_OP_const4u or DW_OP_const8u is the file
|
||
// address of a structure that contains a function pointer, the pthread
|
||
// key and the offset into the data pointed to by the pthread key. So we
|
||
// must link this address and also set the module of this expression to
|
||
// the new_module_sp so we can resolve the file address correctly
|
||
if (const_byte_size > 0) {
|
||
lldb::addr_t linked_file_addr = link_address_callback(const_value);
|
||
if (linked_file_addr == LLDB_INVALID_ADDRESS)
|
||
return false;
|
||
// Replace the address in the new buffer
|
||
if (encoder.PutMaxU64(const_offset, const_byte_size,
|
||
linked_file_addr) == UINT32_MAX)
|
||
return false;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
const_offset = 0;
|
||
const_value = 0;
|
||
const_byte_size = 0;
|
||
break;
|
||
}
|
||
|
||
if (!decoded_data) {
|
||
const offset_t op_arg_size = GetOpcodeDataSize(m_data, offset, op);
|
||
if (op_arg_size == LLDB_INVALID_OFFSET)
|
||
return false;
|
||
else
|
||
offset += op_arg_size;
|
||
}
|
||
}
|
||
|
||
// If we linked the TLS address correctly, update the module so that when the
|
||
// expression is evaluated it can resolve the file address to a load address
|
||
// and read the
|
||
// TLS data
|
||
m_module_wp = new_module_sp;
|
||
m_data.SetData(heap_data_sp);
|
||
return true;
|
||
}
|
||
|
||
bool DWARFExpression::LocationListContainsAddress(
|
||
lldb::addr_t loclist_base_addr, lldb::addr_t addr) const {
|
||
if (addr == LLDB_INVALID_ADDRESS)
|
||
return false;
|
||
|
||
if (IsLocationList()) {
|
||
lldb::offset_t offset = 0;
|
||
|
||
if (loclist_base_addr == LLDB_INVALID_ADDRESS)
|
||
return false;
|
||
|
||
while (m_data.ValidOffset(offset)) {
|
||
// We need to figure out what the value is for the location.
|
||
addr_t lo_pc = LLDB_INVALID_ADDRESS;
|
||
addr_t hi_pc = LLDB_INVALID_ADDRESS;
|
||
if (!AddressRangeForLocationListEntry(m_dwarf_cu, m_data, &offset, lo_pc,
|
||
hi_pc))
|
||
break;
|
||
|
||
if (lo_pc == 0 && hi_pc == 0)
|
||
break;
|
||
|
||
lo_pc += loclist_base_addr - m_loclist_slide;
|
||
hi_pc += loclist_base_addr - m_loclist_slide;
|
||
|
||
if (lo_pc <= addr && addr < hi_pc)
|
||
return true;
|
||
|
||
offset += m_data.GetU16(&offset);
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
bool DWARFExpression::GetLocation(addr_t base_addr, addr_t pc,
|
||
lldb::offset_t &offset,
|
||
lldb::offset_t &length) {
|
||
offset = 0;
|
||
if (!IsLocationList()) {
|
||
length = m_data.GetByteSize();
|
||
return true;
|
||
}
|
||
|
||
if (base_addr != LLDB_INVALID_ADDRESS && pc != LLDB_INVALID_ADDRESS) {
|
||
addr_t curr_base_addr = base_addr;
|
||
|
||
while (m_data.ValidOffset(offset)) {
|
||
// We need to figure out what the value is for the location.
|
||
addr_t lo_pc = LLDB_INVALID_ADDRESS;
|
||
addr_t hi_pc = LLDB_INVALID_ADDRESS;
|
||
if (!AddressRangeForLocationListEntry(m_dwarf_cu, m_data, &offset, lo_pc,
|
||
hi_pc))
|
||
break;
|
||
|
||
if (lo_pc == 0 && hi_pc == 0)
|
||
break;
|
||
|
||
lo_pc += curr_base_addr - m_loclist_slide;
|
||
hi_pc += curr_base_addr - m_loclist_slide;
|
||
|
||
length = m_data.GetU16(&offset);
|
||
|
||
if (length > 0 && lo_pc <= pc && pc < hi_pc)
|
||
return true;
|
||
|
||
offset += length;
|
||
}
|
||
}
|
||
offset = LLDB_INVALID_OFFSET;
|
||
length = 0;
|
||
return false;
|
||
}
|
||
|
||
bool DWARFExpression::DumpLocationForAddress(Stream *s,
|
||
lldb::DescriptionLevel level,
|
||
addr_t base_addr, addr_t address,
|
||
ABI *abi) {
|
||
lldb::offset_t offset = 0;
|
||
lldb::offset_t length = 0;
|
||
|
||
if (GetLocation(base_addr, address, offset, length)) {
|
||
if (length > 0) {
|
||
DumpLocation(s, offset, length, level, abi);
|
||
return true;
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
bool DWARFExpression::Evaluate(ExecutionContextScope *exe_scope,
|
||
lldb::addr_t loclist_base_load_addr,
|
||
const Value *initial_value_ptr,
|
||
const Value *object_address_ptr, Value &result,
|
||
Status *error_ptr) const {
|
||
ExecutionContext exe_ctx(exe_scope);
|
||
return Evaluate(&exe_ctx, nullptr, loclist_base_load_addr, initial_value_ptr,
|
||
object_address_ptr, result, error_ptr);
|
||
}
|
||
|
||
bool DWARFExpression::Evaluate(ExecutionContext *exe_ctx,
|
||
RegisterContext *reg_ctx,
|
||
lldb::addr_t loclist_base_load_addr,
|
||
const Value *initial_value_ptr,
|
||
const Value *object_address_ptr, Value &result,
|
||
Status *error_ptr) const {
|
||
ModuleSP module_sp = m_module_wp.lock();
|
||
|
||
if (IsLocationList()) {
|
||
lldb::offset_t offset = 0;
|
||
addr_t pc;
|
||
StackFrame *frame = NULL;
|
||
if (reg_ctx)
|
||
pc = reg_ctx->GetPC();
|
||
else {
|
||
frame = exe_ctx->GetFramePtr();
|
||
if (!frame)
|
||
return false;
|
||
RegisterContextSP reg_ctx_sp = frame->GetRegisterContext();
|
||
if (!reg_ctx_sp)
|
||
return false;
|
||
pc = reg_ctx_sp->GetPC();
|
||
}
|
||
|
||
if (loclist_base_load_addr != LLDB_INVALID_ADDRESS) {
|
||
if (pc == LLDB_INVALID_ADDRESS) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Invalid PC in frame.");
|
||
return false;
|
||
}
|
||
|
||
addr_t curr_loclist_base_load_addr = loclist_base_load_addr;
|
||
|
||
while (m_data.ValidOffset(offset)) {
|
||
// We need to figure out what the value is for the location.
|
||
addr_t lo_pc = LLDB_INVALID_ADDRESS;
|
||
addr_t hi_pc = LLDB_INVALID_ADDRESS;
|
||
if (!AddressRangeForLocationListEntry(m_dwarf_cu, m_data, &offset,
|
||
lo_pc, hi_pc))
|
||
break;
|
||
|
||
if (lo_pc == 0 && hi_pc == 0)
|
||
break;
|
||
|
||
lo_pc += curr_loclist_base_load_addr - m_loclist_slide;
|
||
hi_pc += curr_loclist_base_load_addr - m_loclist_slide;
|
||
|
||
uint16_t length = m_data.GetU16(&offset);
|
||
|
||
if (length > 0 && lo_pc <= pc && pc < hi_pc) {
|
||
return DWARFExpression::Evaluate(
|
||
exe_ctx, reg_ctx, module_sp, m_data, m_dwarf_cu, offset, length,
|
||
m_reg_kind, initial_value_ptr, object_address_ptr, result,
|
||
error_ptr);
|
||
}
|
||
offset += length;
|
||
}
|
||
}
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("variable not available");
|
||
return false;
|
||
}
|
||
|
||
// Not a location list, just a single expression.
|
||
return DWARFExpression::Evaluate(
|
||
exe_ctx, reg_ctx, module_sp, m_data, m_dwarf_cu, 0, m_data.GetByteSize(),
|
||
m_reg_kind, initial_value_ptr, object_address_ptr, result, error_ptr);
|
||
}
|
||
|
||
bool DWARFExpression::Evaluate(
|
||
ExecutionContext *exe_ctx, RegisterContext *reg_ctx,
|
||
lldb::ModuleSP module_sp, const DataExtractor &opcodes,
|
||
DWARFUnit *dwarf_cu, const lldb::offset_t opcodes_offset,
|
||
const lldb::offset_t opcodes_length, const lldb::RegisterKind reg_kind,
|
||
const Value *initial_value_ptr, const Value *object_address_ptr,
|
||
Value &result, Status *error_ptr) {
|
||
|
||
if (opcodes_length == 0) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"no location, value may have been optimized out");
|
||
return false;
|
||
}
|
||
std::vector<Value> stack;
|
||
|
||
Process *process = NULL;
|
||
StackFrame *frame = NULL;
|
||
|
||
if (exe_ctx) {
|
||
process = exe_ctx->GetProcessPtr();
|
||
frame = exe_ctx->GetFramePtr();
|
||
}
|
||
if (reg_ctx == NULL && frame)
|
||
reg_ctx = frame->GetRegisterContext().get();
|
||
|
||
if (initial_value_ptr)
|
||
stack.push_back(*initial_value_ptr);
|
||
|
||
lldb::offset_t offset = opcodes_offset;
|
||
const lldb::offset_t end_offset = opcodes_offset + opcodes_length;
|
||
Value tmp;
|
||
uint32_t reg_num;
|
||
|
||
/// Insertion point for evaluating multi-piece expression.
|
||
uint64_t op_piece_offset = 0;
|
||
Value pieces; // Used for DW_OP_piece
|
||
|
||
// Make sure all of the data is available in opcodes.
|
||
if (!opcodes.ValidOffsetForDataOfSize(opcodes_offset, opcodes_length)) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"invalid offset and/or length for opcodes buffer.");
|
||
return false;
|
||
}
|
||
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
|
||
|
||
while (opcodes.ValidOffset(offset) && offset < end_offset) {
|
||
const lldb::offset_t op_offset = offset;
|
||
const uint8_t op = opcodes.GetU8(&offset);
|
||
|
||
if (log && log->GetVerbose()) {
|
||
size_t count = stack.size();
|
||
log->Printf("Stack before operation has %" PRIu64 " values:",
|
||
(uint64_t)count);
|
||
for (size_t i = 0; i < count; ++i) {
|
||
StreamString new_value;
|
||
new_value.Printf("[%" PRIu64 "]", (uint64_t)i);
|
||
stack[i].Dump(&new_value);
|
||
log->Printf(" %s", new_value.GetData());
|
||
}
|
||
log->Printf("0x%8.8" PRIx64 ": %s", op_offset, DW_OP_value_to_name(op));
|
||
}
|
||
|
||
switch (op) {
|
||
//----------------------------------------------------------------------
|
||
// The DW_OP_addr operation has a single operand that encodes a machine
|
||
// address and whose size is the size of an address on the target machine.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_addr:
|
||
stack.push_back(Scalar(opcodes.GetAddress(&offset)));
|
||
stack.back().SetValueType(Value::eValueTypeFileAddress);
|
||
// Convert the file address to a load address, so subsequent
|
||
// DWARF operators can operate on it.
|
||
if (frame)
|
||
stack.back().ConvertToLoadAddress(module_sp.get(),
|
||
frame->CalculateTarget().get());
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// The DW_OP_addr_sect_offset4 is used for any location expressions in
|
||
// shared libraries that have a location like:
|
||
// DW_OP_addr(0x1000)
|
||
// If this address resides in a shared library, then this virtual address
|
||
// won't make sense when it is evaluated in the context of a running
|
||
// process where shared libraries have been slid. To account for this, this
|
||
// new address type where we can store the section pointer and a 4 byte
|
||
// offset.
|
||
//----------------------------------------------------------------------
|
||
// case DW_OP_addr_sect_offset4:
|
||
// {
|
||
// result_type = eResultTypeFileAddress;
|
||
// lldb::Section *sect = (lldb::Section
|
||
// *)opcodes.GetMaxU64(&offset, sizeof(void *));
|
||
// lldb::addr_t sect_offset = opcodes.GetU32(&offset);
|
||
//
|
||
// Address so_addr (sect, sect_offset);
|
||
// lldb::addr_t load_addr = so_addr.GetLoadAddress();
|
||
// if (load_addr != LLDB_INVALID_ADDRESS)
|
||
// {
|
||
// // We successfully resolve a file address to a load
|
||
// // address.
|
||
// stack.push_back(load_addr);
|
||
// break;
|
||
// }
|
||
// else
|
||
// {
|
||
// // We were able
|
||
// if (error_ptr)
|
||
// error_ptr->SetErrorStringWithFormat ("Section %s in
|
||
// %s is not currently loaded.\n",
|
||
// sect->GetName().AsCString(),
|
||
// sect->GetModule()->GetFileSpec().GetFilename().AsCString());
|
||
// return false;
|
||
// }
|
||
// }
|
||
// break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_deref
|
||
// OPERANDS: none
|
||
// DESCRIPTION: Pops the top stack entry and treats it as an address.
|
||
// The value retrieved from that address is pushed. The size of the data
|
||
// retrieved from the dereferenced address is the size of an address on the
|
||
// target machine.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_deref: {
|
||
if (stack.empty()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Expression stack empty for DW_OP_deref.");
|
||
return false;
|
||
}
|
||
Value::ValueType value_type = stack.back().GetValueType();
|
||
switch (value_type) {
|
||
case Value::eValueTypeHostAddress: {
|
||
void *src = (void *)stack.back().GetScalar().ULongLong();
|
||
intptr_t ptr;
|
||
::memcpy(&ptr, src, sizeof(void *));
|
||
stack.back().GetScalar() = ptr;
|
||
stack.back().ClearContext();
|
||
} break;
|
||
case Value::eValueTypeFileAddress: {
|
||
auto file_addr = stack.back().GetScalar().ULongLong(
|
||
LLDB_INVALID_ADDRESS);
|
||
if (!module_sp) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"need module to resolve file address for DW_OP_deref");
|
||
return false;
|
||
}
|
||
Address so_addr;
|
||
if (!module_sp->ResolveFileAddress(file_addr, so_addr)) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"failed to resolve file address in module");
|
||
return false;
|
||
}
|
||
addr_t load_Addr = so_addr.GetLoadAddress(exe_ctx->GetTargetPtr());
|
||
if (load_Addr == LLDB_INVALID_ADDRESS) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"failed to resolve load address");
|
||
return false;
|
||
}
|
||
stack.back().GetScalar() = load_Addr;
|
||
stack.back().SetValueType(Value::eValueTypeLoadAddress);
|
||
// Fall through to load address code below...
|
||
} LLVM_FALLTHROUGH;
|
||
case Value::eValueTypeLoadAddress:
|
||
if (exe_ctx) {
|
||
if (process) {
|
||
lldb::addr_t pointer_addr =
|
||
stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
|
||
Status error;
|
||
lldb::addr_t pointer_value =
|
||
process->ReadPointerFromMemory(pointer_addr, error);
|
||
if (pointer_value != LLDB_INVALID_ADDRESS) {
|
||
stack.back().GetScalar() = pointer_value;
|
||
stack.back().ClearContext();
|
||
} else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"Failed to dereference pointer from 0x%" PRIx64
|
||
" for DW_OP_deref: %s\n",
|
||
pointer_addr, error.AsCString());
|
||
return false;
|
||
}
|
||
} else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"NULL process for DW_OP_deref.\n");
|
||
return false;
|
||
}
|
||
} else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"NULL execution context for DW_OP_deref.\n");
|
||
return false;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
} break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_deref_size
|
||
// OPERANDS: 1
|
||
// 1 - uint8_t that specifies the size of the data to dereference.
|
||
// DESCRIPTION: Behaves like the DW_OP_deref operation: it pops the top
|
||
// stack entry and treats it as an address. The value retrieved from that
|
||
// address is pushed. In the DW_OP_deref_size operation, however, the size
|
||
// in bytes of the data retrieved from the dereferenced address is
|
||
// specified by the single operand. This operand is a 1-byte unsigned
|
||
// integral constant whose value may not be larger than the size of an
|
||
// address on the target machine. The data retrieved is zero extended to
|
||
// the size of an address on the target machine before being pushed on the
|
||
// expression stack.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_deref_size: {
|
||
if (stack.empty()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack empty for DW_OP_deref_size.");
|
||
return false;
|
||
}
|
||
uint8_t size = opcodes.GetU8(&offset);
|
||
Value::ValueType value_type = stack.back().GetValueType();
|
||
switch (value_type) {
|
||
case Value::eValueTypeHostAddress: {
|
||
void *src = (void *)stack.back().GetScalar().ULongLong();
|
||
intptr_t ptr;
|
||
::memcpy(&ptr, src, sizeof(void *));
|
||
// I can't decide whether the size operand should apply to the bytes in
|
||
// their
|
||
// lldb-host endianness or the target endianness.. I doubt this'll ever
|
||
// come up but I'll opt for assuming big endian regardless.
|
||
switch (size) {
|
||
case 1:
|
||
ptr = ptr & 0xff;
|
||
break;
|
||
case 2:
|
||
ptr = ptr & 0xffff;
|
||
break;
|
||
case 3:
|
||
ptr = ptr & 0xffffff;
|
||
break;
|
||
case 4:
|
||
ptr = ptr & 0xffffffff;
|
||
break;
|
||
// the casts are added to work around the case where intptr_t is a 32
|
||
// bit quantity;
|
||
// presumably we won't hit the 5..7 cases if (void*) is 32-bits in this
|
||
// program.
|
||
case 5:
|
||
ptr = (intptr_t)ptr & 0xffffffffffULL;
|
||
break;
|
||
case 6:
|
||
ptr = (intptr_t)ptr & 0xffffffffffffULL;
|
||
break;
|
||
case 7:
|
||
ptr = (intptr_t)ptr & 0xffffffffffffffULL;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
stack.back().GetScalar() = ptr;
|
||
stack.back().ClearContext();
|
||
} break;
|
||
case Value::eValueTypeLoadAddress:
|
||
if (exe_ctx) {
|
||
if (process) {
|
||
lldb::addr_t pointer_addr =
|
||
stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
|
||
uint8_t addr_bytes[sizeof(lldb::addr_t)];
|
||
Status error;
|
||
if (process->ReadMemory(pointer_addr, &addr_bytes, size, error) ==
|
||
size) {
|
||
DataExtractor addr_data(addr_bytes, sizeof(addr_bytes),
|
||
process->GetByteOrder(), size);
|
||
lldb::offset_t addr_data_offset = 0;
|
||
switch (size) {
|
||
case 1:
|
||
stack.back().GetScalar() = addr_data.GetU8(&addr_data_offset);
|
||
break;
|
||
case 2:
|
||
stack.back().GetScalar() = addr_data.GetU16(&addr_data_offset);
|
||
break;
|
||
case 4:
|
||
stack.back().GetScalar() = addr_data.GetU32(&addr_data_offset);
|
||
break;
|
||
case 8:
|
||
stack.back().GetScalar() = addr_data.GetU64(&addr_data_offset);
|
||
break;
|
||
default:
|
||
stack.back().GetScalar() =
|
||
addr_data.GetPointer(&addr_data_offset);
|
||
}
|
||
stack.back().ClearContext();
|
||
} else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"Failed to dereference pointer from 0x%" PRIx64
|
||
" for DW_OP_deref: %s\n",
|
||
pointer_addr, error.AsCString());
|
||
return false;
|
||
}
|
||
} else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"NULL process for DW_OP_deref.\n");
|
||
return false;
|
||
}
|
||
} else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"NULL execution context for DW_OP_deref.\n");
|
||
return false;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
} break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_xderef_size
|
||
// OPERANDS: 1
|
||
// 1 - uint8_t that specifies the size of the data to dereference.
|
||
// DESCRIPTION: Behaves like the DW_OP_xderef operation: the entry at
|
||
// the top of the stack is treated as an address. The second stack entry is
|
||
// treated as an "address space identifier" for those architectures that
|
||
// support multiple address spaces. The top two stack elements are popped,
|
||
// a data item is retrieved through an implementation-defined address
|
||
// calculation and pushed as the new stack top. In the DW_OP_xderef_size
|
||
// operation, however, the size in bytes of the data retrieved from the
|
||
// dereferenced address is specified by the single operand. This operand is
|
||
// a 1-byte unsigned integral constant whose value may not be larger than
|
||
// the size of an address on the target machine. The data retrieved is zero
|
||
// extended to the size of an address on the target machine before being
|
||
// pushed on the expression stack.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_xderef_size:
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Unimplemented opcode: DW_OP_xderef_size.");
|
||
return false;
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_xderef
|
||
// OPERANDS: none
|
||
// DESCRIPTION: Provides an extended dereference mechanism. The entry at
|
||
// the top of the stack is treated as an address. The second stack entry is
|
||
// treated as an "address space identifier" for those architectures that
|
||
// support multiple address spaces. The top two stack elements are popped,
|
||
// a data item is retrieved through an implementation-defined address
|
||
// calculation and pushed as the new stack top. The size of the data
|
||
// retrieved from the dereferenced address is the size of an address on the
|
||
// target machine.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_xderef:
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Unimplemented opcode: DW_OP_xderef.");
|
||
return false;
|
||
|
||
//----------------------------------------------------------------------
|
||
// All DW_OP_constXXX opcodes have a single operand as noted below:
|
||
//
|
||
// Opcode Operand 1
|
||
// --------------- ----------------------------------------------------
|
||
// DW_OP_const1u 1-byte unsigned integer constant DW_OP_const1s
|
||
// 1-byte signed integer constant DW_OP_const2u 2-byte unsigned integer
|
||
// constant DW_OP_const2s 2-byte signed integer constant DW_OP_const4u
|
||
// 4-byte unsigned integer constant DW_OP_const4s 4-byte signed integer
|
||
// constant DW_OP_const8u 8-byte unsigned integer constant DW_OP_const8s
|
||
// 8-byte signed integer constant DW_OP_constu unsigned LEB128 integer
|
||
// constant DW_OP_consts signed LEB128 integer constant
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_const1u:
|
||
stack.push_back(Scalar((uint8_t)opcodes.GetU8(&offset)));
|
||
break;
|
||
case DW_OP_const1s:
|
||
stack.push_back(Scalar((int8_t)opcodes.GetU8(&offset)));
|
||
break;
|
||
case DW_OP_const2u:
|
||
stack.push_back(Scalar((uint16_t)opcodes.GetU16(&offset)));
|
||
break;
|
||
case DW_OP_const2s:
|
||
stack.push_back(Scalar((int16_t)opcodes.GetU16(&offset)));
|
||
break;
|
||
case DW_OP_const4u:
|
||
stack.push_back(Scalar((uint32_t)opcodes.GetU32(&offset)));
|
||
break;
|
||
case DW_OP_const4s:
|
||
stack.push_back(Scalar((int32_t)opcodes.GetU32(&offset)));
|
||
break;
|
||
case DW_OP_const8u:
|
||
stack.push_back(Scalar((uint64_t)opcodes.GetU64(&offset)));
|
||
break;
|
||
case DW_OP_const8s:
|
||
stack.push_back(Scalar((int64_t)opcodes.GetU64(&offset)));
|
||
break;
|
||
case DW_OP_constu:
|
||
stack.push_back(Scalar(opcodes.GetULEB128(&offset)));
|
||
break;
|
||
case DW_OP_consts:
|
||
stack.push_back(Scalar(opcodes.GetSLEB128(&offset)));
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_dup
|
||
// OPERANDS: none
|
||
// DESCRIPTION: duplicates the value at the top of the stack
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_dup:
|
||
if (stack.empty()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Expression stack empty for DW_OP_dup.");
|
||
return false;
|
||
} else
|
||
stack.push_back(stack.back());
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_drop
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the value at the top of the stack
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_drop:
|
||
if (stack.empty()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Expression stack empty for DW_OP_drop.");
|
||
return false;
|
||
} else
|
||
stack.pop_back();
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_over
|
||
// OPERANDS: none
|
||
// DESCRIPTION: Duplicates the entry currently second in the stack at
|
||
// the top of the stack.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_over:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_over.");
|
||
return false;
|
||
} else
|
||
stack.push_back(stack[stack.size() - 2]);
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_pick
|
||
// OPERANDS: uint8_t index into the current stack
|
||
// DESCRIPTION: The stack entry with the specified index (0 through 255,
|
||
// inclusive) is pushed on the stack
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_pick: {
|
||
uint8_t pick_idx = opcodes.GetU8(&offset);
|
||
if (pick_idx < stack.size())
|
||
stack.push_back(stack[pick_idx]);
|
||
else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"Index %u out of range for DW_OP_pick.\n", pick_idx);
|
||
return false;
|
||
}
|
||
} break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_swap
|
||
// OPERANDS: none
|
||
// DESCRIPTION: swaps the top two stack entries. The entry at the top
|
||
// of the stack becomes the second stack entry, and the second entry
|
||
// becomes the top of the stack
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_swap:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_swap.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.back() = stack[stack.size() - 2];
|
||
stack[stack.size() - 2] = tmp;
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_rot
|
||
// OPERANDS: none
|
||
// DESCRIPTION: Rotates the first three stack entries. The entry at
|
||
// the top of the stack becomes the third stack entry, the second entry
|
||
// becomes the top of the stack, and the third entry becomes the second
|
||
// entry.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_rot:
|
||
if (stack.size() < 3) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 3 items for DW_OP_rot.");
|
||
return false;
|
||
} else {
|
||
size_t last_idx = stack.size() - 1;
|
||
Value old_top = stack[last_idx];
|
||
stack[last_idx] = stack[last_idx - 1];
|
||
stack[last_idx - 1] = stack[last_idx - 2];
|
||
stack[last_idx - 2] = old_top;
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_abs
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top stack entry, interprets it as a signed
|
||
// value and pushes its absolute value. If the absolute value can not be
|
||
// represented, the result is undefined.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_abs:
|
||
if (stack.empty()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 1 item for DW_OP_abs.");
|
||
return false;
|
||
} else if (!stack.back().ResolveValue(exe_ctx).AbsoluteValue()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Failed to take the absolute value of the first stack item.");
|
||
return false;
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_and
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack values, performs a bitwise and
|
||
// operation on the two, and pushes the result.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_and:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_and.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) =
|
||
stack.back().ResolveValue(exe_ctx) & tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_div
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack values, divides the former second
|
||
// entry by the former top of the stack using signed division, and pushes
|
||
// the result.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_div:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_div.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
if (tmp.ResolveValue(exe_ctx).IsZero()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Divide by zero.");
|
||
return false;
|
||
} else {
|
||
stack.pop_back();
|
||
stack.back() =
|
||
stack.back().ResolveValue(exe_ctx) / tmp.ResolveValue(exe_ctx);
|
||
if (!stack.back().ResolveValue(exe_ctx).IsValid()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Divide failed.");
|
||
return false;
|
||
}
|
||
}
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_minus
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack values, subtracts the former top
|
||
// of the stack from the former second entry, and pushes the result.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_minus:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_minus.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) =
|
||
stack.back().ResolveValue(exe_ctx) - tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_mod
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack values and pushes the result of
|
||
// the calculation: former second stack entry modulo the former top of the
|
||
// stack.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_mod:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_mod.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) =
|
||
stack.back().ResolveValue(exe_ctx) % tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_mul
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack entries, multiplies them
|
||
// together, and pushes the result.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_mul:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_mul.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) =
|
||
stack.back().ResolveValue(exe_ctx) * tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_neg
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top stack entry, and pushes its negation.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_neg:
|
||
if (stack.empty()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 1 item for DW_OP_neg.");
|
||
return false;
|
||
} else {
|
||
if (!stack.back().ResolveValue(exe_ctx).UnaryNegate()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Unary negate failed.");
|
||
return false;
|
||
}
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_not
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top stack entry, and pushes its bitwise
|
||
// complement
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_not:
|
||
if (stack.empty()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 1 item for DW_OP_not.");
|
||
return false;
|
||
} else {
|
||
if (!stack.back().ResolveValue(exe_ctx).OnesComplement()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Logical NOT failed.");
|
||
return false;
|
||
}
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_or
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack entries, performs a bitwise or
|
||
// operation on the two, and pushes the result.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_or:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_or.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) =
|
||
stack.back().ResolveValue(exe_ctx) | tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_plus
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack entries, adds them together, and
|
||
// pushes the result.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_plus:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_plus.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().GetScalar() += tmp.GetScalar();
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_plus_uconst
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top stack entry, adds it to the unsigned LEB128
|
||
// constant operand and pushes the result.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_plus_uconst:
|
||
if (stack.empty()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 1 item for DW_OP_plus_uconst.");
|
||
return false;
|
||
} else {
|
||
const uint64_t uconst_value = opcodes.GetULEB128(&offset);
|
||
// Implicit conversion from a UINT to a Scalar...
|
||
stack.back().GetScalar() += uconst_value;
|
||
if (!stack.back().GetScalar().IsValid()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("DW_OP_plus_uconst failed.");
|
||
return false;
|
||
}
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_shl
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack entries, shifts the former
|
||
// second entry left by the number of bits specified by the former top of
|
||
// the stack, and pushes the result.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_shl:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_shl.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) <<= tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_shr
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack entries, shifts the former second
|
||
// entry right logically (filling with zero bits) by the number of bits
|
||
// specified by the former top of the stack, and pushes the result.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_shr:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_shr.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
if (!stack.back().ResolveValue(exe_ctx).ShiftRightLogical(
|
||
tmp.ResolveValue(exe_ctx))) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("DW_OP_shr failed.");
|
||
return false;
|
||
}
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_shra
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack entries, shifts the former second
|
||
// entry right arithmetically (divide the magnitude by 2, keep the same
|
||
// sign for the result) by the number of bits specified by the former top
|
||
// of the stack, and pushes the result.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_shra:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_shra.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) >>= tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_xor
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack entries, performs the bitwise
|
||
// exclusive-or operation on the two, and pushes the result.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_xor:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_xor.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) =
|
||
stack.back().ResolveValue(exe_ctx) ^ tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_skip
|
||
// OPERANDS: int16_t
|
||
// DESCRIPTION: An unconditional branch. Its single operand is a 2-byte
|
||
// signed integer constant. The 2-byte constant is the number of bytes of
|
||
// the DWARF expression to skip forward or backward from the current
|
||
// operation, beginning after the 2-byte constant.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_skip: {
|
||
int16_t skip_offset = (int16_t)opcodes.GetU16(&offset);
|
||
lldb::offset_t new_offset = offset + skip_offset;
|
||
if (new_offset >= opcodes_offset && new_offset < end_offset)
|
||
offset = new_offset;
|
||
else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Invalid opcode offset in DW_OP_skip.");
|
||
return false;
|
||
}
|
||
} break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_bra
|
||
// OPERANDS: int16_t
|
||
// DESCRIPTION: A conditional branch. Its single operand is a 2-byte
|
||
// signed integer constant. This operation pops the top of stack. If the
|
||
// value popped is not the constant 0, the 2-byte constant operand is the
|
||
// number of bytes of the DWARF expression to skip forward or backward from
|
||
// the current operation, beginning after the 2-byte constant.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_bra:
|
||
if (stack.empty()) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 1 item for DW_OP_bra.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
int16_t bra_offset = (int16_t)opcodes.GetU16(&offset);
|
||
Scalar zero(0);
|
||
if (tmp.ResolveValue(exe_ctx) != zero) {
|
||
lldb::offset_t new_offset = offset + bra_offset;
|
||
if (new_offset >= opcodes_offset && new_offset < end_offset)
|
||
offset = new_offset;
|
||
else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Invalid opcode offset in DW_OP_bra.");
|
||
return false;
|
||
}
|
||
}
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_eq
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack values, compares using the
|
||
// equals (==) operator.
|
||
// STACK RESULT: push the constant value 1 onto the stack if the result
|
||
// of the operation is true or the constant value 0 if the result of the
|
||
// operation is false.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_eq:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_eq.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) =
|
||
stack.back().ResolveValue(exe_ctx) == tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_ge
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack values, compares using the
|
||
// greater than or equal to (>=) operator.
|
||
// STACK RESULT: push the constant value 1 onto the stack if the result
|
||
// of the operation is true or the constant value 0 if the result of the
|
||
// operation is false.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_ge:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_ge.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) =
|
||
stack.back().ResolveValue(exe_ctx) >= tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_gt
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack values, compares using the
|
||
// greater than (>) operator.
|
||
// STACK RESULT: push the constant value 1 onto the stack if the result
|
||
// of the operation is true or the constant value 0 if the result of the
|
||
// operation is false.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_gt:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_gt.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) =
|
||
stack.back().ResolveValue(exe_ctx) > tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_le
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack values, compares using the
|
||
// less than or equal to (<=) operator.
|
||
// STACK RESULT: push the constant value 1 onto the stack if the result
|
||
// of the operation is true or the constant value 0 if the result of the
|
||
// operation is false.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_le:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_le.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) =
|
||
stack.back().ResolveValue(exe_ctx) <= tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_lt
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack values, compares using the
|
||
// less than (<) operator.
|
||
// STACK RESULT: push the constant value 1 onto the stack if the result
|
||
// of the operation is true or the constant value 0 if the result of the
|
||
// operation is false.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_lt:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_lt.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) =
|
||
stack.back().ResolveValue(exe_ctx) < tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_ne
|
||
// OPERANDS: none
|
||
// DESCRIPTION: pops the top two stack values, compares using the
|
||
// not equal (!=) operator.
|
||
// STACK RESULT: push the constant value 1 onto the stack if the result
|
||
// of the operation is true or the constant value 0 if the result of the
|
||
// operation is false.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_ne:
|
||
if (stack.size() < 2) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 2 items for DW_OP_ne.");
|
||
return false;
|
||
} else {
|
||
tmp = stack.back();
|
||
stack.pop_back();
|
||
stack.back().ResolveValue(exe_ctx) =
|
||
stack.back().ResolveValue(exe_ctx) != tmp.ResolveValue(exe_ctx);
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_litn
|
||
// OPERANDS: none
|
||
// DESCRIPTION: encode the unsigned literal values from 0 through 31.
|
||
// STACK RESULT: push the unsigned literal constant value onto the top
|
||
// of the stack.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_lit0:
|
||
case DW_OP_lit1:
|
||
case DW_OP_lit2:
|
||
case DW_OP_lit3:
|
||
case DW_OP_lit4:
|
||
case DW_OP_lit5:
|
||
case DW_OP_lit6:
|
||
case DW_OP_lit7:
|
||
case DW_OP_lit8:
|
||
case DW_OP_lit9:
|
||
case DW_OP_lit10:
|
||
case DW_OP_lit11:
|
||
case DW_OP_lit12:
|
||
case DW_OP_lit13:
|
||
case DW_OP_lit14:
|
||
case DW_OP_lit15:
|
||
case DW_OP_lit16:
|
||
case DW_OP_lit17:
|
||
case DW_OP_lit18:
|
||
case DW_OP_lit19:
|
||
case DW_OP_lit20:
|
||
case DW_OP_lit21:
|
||
case DW_OP_lit22:
|
||
case DW_OP_lit23:
|
||
case DW_OP_lit24:
|
||
case DW_OP_lit25:
|
||
case DW_OP_lit26:
|
||
case DW_OP_lit27:
|
||
case DW_OP_lit28:
|
||
case DW_OP_lit29:
|
||
case DW_OP_lit30:
|
||
case DW_OP_lit31:
|
||
stack.push_back(Scalar((uint64_t)(op - DW_OP_lit0)));
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_regN
|
||
// OPERANDS: none
|
||
// DESCRIPTION: Push the value in register n on the top of the stack.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_reg0:
|
||
case DW_OP_reg1:
|
||
case DW_OP_reg2:
|
||
case DW_OP_reg3:
|
||
case DW_OP_reg4:
|
||
case DW_OP_reg5:
|
||
case DW_OP_reg6:
|
||
case DW_OP_reg7:
|
||
case DW_OP_reg8:
|
||
case DW_OP_reg9:
|
||
case DW_OP_reg10:
|
||
case DW_OP_reg11:
|
||
case DW_OP_reg12:
|
||
case DW_OP_reg13:
|
||
case DW_OP_reg14:
|
||
case DW_OP_reg15:
|
||
case DW_OP_reg16:
|
||
case DW_OP_reg17:
|
||
case DW_OP_reg18:
|
||
case DW_OP_reg19:
|
||
case DW_OP_reg20:
|
||
case DW_OP_reg21:
|
||
case DW_OP_reg22:
|
||
case DW_OP_reg23:
|
||
case DW_OP_reg24:
|
||
case DW_OP_reg25:
|
||
case DW_OP_reg26:
|
||
case DW_OP_reg27:
|
||
case DW_OP_reg28:
|
||
case DW_OP_reg29:
|
||
case DW_OP_reg30:
|
||
case DW_OP_reg31: {
|
||
reg_num = op - DW_OP_reg0;
|
||
|
||
if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr, tmp))
|
||
stack.push_back(tmp);
|
||
else
|
||
return false;
|
||
} break;
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_regx
|
||
// OPERANDS:
|
||
// ULEB128 literal operand that encodes the register.
|
||
// DESCRIPTION: Push the value in register on the top of the stack.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_regx: {
|
||
reg_num = opcodes.GetULEB128(&offset);
|
||
if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr, tmp))
|
||
stack.push_back(tmp);
|
||
else
|
||
return false;
|
||
} break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_bregN
|
||
// OPERANDS:
|
||
// SLEB128 offset from register N
|
||
// DESCRIPTION: Value is in memory at the address specified by register
|
||
// N plus an offset.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_breg0:
|
||
case DW_OP_breg1:
|
||
case DW_OP_breg2:
|
||
case DW_OP_breg3:
|
||
case DW_OP_breg4:
|
||
case DW_OP_breg5:
|
||
case DW_OP_breg6:
|
||
case DW_OP_breg7:
|
||
case DW_OP_breg8:
|
||
case DW_OP_breg9:
|
||
case DW_OP_breg10:
|
||
case DW_OP_breg11:
|
||
case DW_OP_breg12:
|
||
case DW_OP_breg13:
|
||
case DW_OP_breg14:
|
||
case DW_OP_breg15:
|
||
case DW_OP_breg16:
|
||
case DW_OP_breg17:
|
||
case DW_OP_breg18:
|
||
case DW_OP_breg19:
|
||
case DW_OP_breg20:
|
||
case DW_OP_breg21:
|
||
case DW_OP_breg22:
|
||
case DW_OP_breg23:
|
||
case DW_OP_breg24:
|
||
case DW_OP_breg25:
|
||
case DW_OP_breg26:
|
||
case DW_OP_breg27:
|
||
case DW_OP_breg28:
|
||
case DW_OP_breg29:
|
||
case DW_OP_breg30:
|
||
case DW_OP_breg31: {
|
||
reg_num = op - DW_OP_breg0;
|
||
|
||
if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr,
|
||
tmp)) {
|
||
int64_t breg_offset = opcodes.GetSLEB128(&offset);
|
||
tmp.ResolveValue(exe_ctx) += (uint64_t)breg_offset;
|
||
tmp.ClearContext();
|
||
stack.push_back(tmp);
|
||
stack.back().SetValueType(Value::eValueTypeLoadAddress);
|
||
} else
|
||
return false;
|
||
} break;
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_bregx
|
||
// OPERANDS: 2
|
||
// ULEB128 literal operand that encodes the register.
|
||
// SLEB128 offset from register N
|
||
// DESCRIPTION: Value is in memory at the address specified by register
|
||
// N plus an offset.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_bregx: {
|
||
reg_num = opcodes.GetULEB128(&offset);
|
||
|
||
if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr,
|
||
tmp)) {
|
||
int64_t breg_offset = opcodes.GetSLEB128(&offset);
|
||
tmp.ResolveValue(exe_ctx) += (uint64_t)breg_offset;
|
||
tmp.ClearContext();
|
||
stack.push_back(tmp);
|
||
stack.back().SetValueType(Value::eValueTypeLoadAddress);
|
||
} else
|
||
return false;
|
||
} break;
|
||
|
||
case DW_OP_fbreg:
|
||
if (exe_ctx) {
|
||
if (frame) {
|
||
Scalar value;
|
||
if (frame->GetFrameBaseValue(value, error_ptr)) {
|
||
int64_t fbreg_offset = opcodes.GetSLEB128(&offset);
|
||
value += fbreg_offset;
|
||
stack.push_back(value);
|
||
stack.back().SetValueType(Value::eValueTypeLoadAddress);
|
||
} else
|
||
return false;
|
||
} else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Invalid stack frame in context for DW_OP_fbreg opcode.");
|
||
return false;
|
||
}
|
||
} else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"NULL execution context for DW_OP_fbreg.\n");
|
||
return false;
|
||
}
|
||
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_nop
|
||
// OPERANDS: none
|
||
// DESCRIPTION: A place holder. It has no effect on the location stack
|
||
// or any of its values.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_nop:
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_piece
|
||
// OPERANDS: 1
|
||
// ULEB128: byte size of the piece
|
||
// DESCRIPTION: The operand describes the size in bytes of the piece of
|
||
// the object referenced by the DWARF expression whose result is at the top
|
||
// of the stack. If the piece is located in a register, but does not occupy
|
||
// the entire register, the placement of the piece within that register is
|
||
// defined by the ABI.
|
||
//
|
||
// Many compilers store a single variable in sets of registers, or store a
|
||
// variable partially in memory and partially in registers. DW_OP_piece
|
||
// provides a way of describing how large a part of a variable a particular
|
||
// DWARF expression refers to.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_piece: {
|
||
const uint64_t piece_byte_size = opcodes.GetULEB128(&offset);
|
||
|
||
if (piece_byte_size > 0) {
|
||
Value curr_piece;
|
||
|
||
if (stack.empty()) {
|
||
// In a multi-piece expression, this means that the current piece is
|
||
// not available. Fill with zeros for now by resizing the data and
|
||
// appending it
|
||
curr_piece.ResizeData(piece_byte_size);
|
||
::memset(curr_piece.GetBuffer().GetBytes(), 0, piece_byte_size);
|
||
pieces.AppendDataToHostBuffer(curr_piece);
|
||
} else {
|
||
Status error;
|
||
// Extract the current piece into "curr_piece"
|
||
Value curr_piece_source_value(stack.back());
|
||
stack.pop_back();
|
||
|
||
const Value::ValueType curr_piece_source_value_type =
|
||
curr_piece_source_value.GetValueType();
|
||
switch (curr_piece_source_value_type) {
|
||
case Value::eValueTypeLoadAddress:
|
||
if (process) {
|
||
if (curr_piece.ResizeData(piece_byte_size) == piece_byte_size) {
|
||
lldb::addr_t load_addr =
|
||
curr_piece_source_value.GetScalar().ULongLong(
|
||
LLDB_INVALID_ADDRESS);
|
||
if (process->ReadMemory(
|
||
load_addr, curr_piece.GetBuffer().GetBytes(),
|
||
piece_byte_size, error) != piece_byte_size) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"failed to read memory DW_OP_piece(%" PRIu64
|
||
") from 0x%" PRIx64,
|
||
piece_byte_size, load_addr);
|
||
return false;
|
||
}
|
||
} else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"failed to resize the piece memory buffer for "
|
||
"DW_OP_piece(%" PRIu64 ")",
|
||
piece_byte_size);
|
||
return false;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case Value::eValueTypeFileAddress:
|
||
case Value::eValueTypeHostAddress:
|
||
if (error_ptr) {
|
||
lldb::addr_t addr = curr_piece_source_value.GetScalar().ULongLong(
|
||
LLDB_INVALID_ADDRESS);
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"failed to read memory DW_OP_piece(%" PRIu64
|
||
") from %s address 0x%" PRIx64,
|
||
piece_byte_size, curr_piece_source_value.GetValueType() ==
|
||
Value::eValueTypeFileAddress
|
||
? "file"
|
||
: "host",
|
||
addr);
|
||
}
|
||
return false;
|
||
|
||
case Value::eValueTypeScalar: {
|
||
uint32_t bit_size = piece_byte_size * 8;
|
||
uint32_t bit_offset = 0;
|
||
if (!curr_piece_source_value.GetScalar().ExtractBitfield(
|
||
bit_size, bit_offset)) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"unable to extract %" PRIu64 " bytes from a %" PRIu64
|
||
" byte scalar value.",
|
||
piece_byte_size,
|
||
(uint64_t)curr_piece_source_value.GetScalar()
|
||
.GetByteSize());
|
||
return false;
|
||
}
|
||
curr_piece = curr_piece_source_value;
|
||
} break;
|
||
|
||
case Value::eValueTypeVector: {
|
||
if (curr_piece_source_value.GetVector().length >= piece_byte_size)
|
||
curr_piece_source_value.GetVector().length = piece_byte_size;
|
||
else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"unable to extract %" PRIu64 " bytes from a %" PRIu64
|
||
" byte vector value.",
|
||
piece_byte_size,
|
||
(uint64_t)curr_piece_source_value.GetVector().length);
|
||
return false;
|
||
}
|
||
} break;
|
||
}
|
||
|
||
// Check if this is the first piece?
|
||
if (op_piece_offset == 0) {
|
||
// This is the first piece, we should push it back onto the stack
|
||
// so subsequent pieces will be able to access this piece and add
|
||
// to it
|
||
if (pieces.AppendDataToHostBuffer(curr_piece) == 0) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("failed to append piece data");
|
||
return false;
|
||
}
|
||
} else {
|
||
// If this is the second or later piece there should be a value on
|
||
// the stack
|
||
if (pieces.GetBuffer().GetByteSize() != op_piece_offset) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"DW_OP_piece for offset %" PRIu64
|
||
" but top of stack is of size %" PRIu64,
|
||
op_piece_offset, pieces.GetBuffer().GetByteSize());
|
||
return false;
|
||
}
|
||
|
||
if (pieces.AppendDataToHostBuffer(curr_piece) == 0) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("failed to append piece data");
|
||
return false;
|
||
}
|
||
}
|
||
op_piece_offset += piece_byte_size;
|
||
}
|
||
}
|
||
} break;
|
||
|
||
case DW_OP_bit_piece: // 0x9d ULEB128 bit size, ULEB128 bit offset (DWARF3);
|
||
if (stack.size() < 1) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"Expression stack needs at least 1 item for DW_OP_bit_piece.");
|
||
return false;
|
||
} else {
|
||
const uint64_t piece_bit_size = opcodes.GetULEB128(&offset);
|
||
const uint64_t piece_bit_offset = opcodes.GetULEB128(&offset);
|
||
switch (stack.back().GetValueType()) {
|
||
case Value::eValueTypeScalar: {
|
||
if (!stack.back().GetScalar().ExtractBitfield(piece_bit_size,
|
||
piece_bit_offset)) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"unable to extract %" PRIu64 " bit value with %" PRIu64
|
||
" bit offset from a %" PRIu64 " bit scalar value.",
|
||
piece_bit_size, piece_bit_offset,
|
||
(uint64_t)(stack.back().GetScalar().GetByteSize() * 8));
|
||
return false;
|
||
}
|
||
} break;
|
||
|
||
case Value::eValueTypeFileAddress:
|
||
case Value::eValueTypeLoadAddress:
|
||
case Value::eValueTypeHostAddress:
|
||
if (error_ptr) {
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"unable to extract DW_OP_bit_piece(bit_size = %" PRIu64
|
||
", bit_offset = %" PRIu64 ") from an address value.",
|
||
piece_bit_size, piece_bit_offset);
|
||
}
|
||
return false;
|
||
|
||
case Value::eValueTypeVector:
|
||
if (error_ptr) {
|
||
error_ptr->SetErrorStringWithFormat(
|
||
"unable to extract DW_OP_bit_piece(bit_size = %" PRIu64
|
||
", bit_offset = %" PRIu64 ") from a vector value.",
|
||
piece_bit_size, piece_bit_offset);
|
||
}
|
||
return false;
|
||
}
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_push_object_address
|
||
// OPERANDS: none
|
||
// DESCRIPTION: Pushes the address of the object currently being
|
||
// evaluated as part of evaluation of a user presented expression. This
|
||
// object may correspond to an independent variable described by its own
|
||
// DIE or it may be a component of an array, structure, or class whose
|
||
// address has been dynamically determined by an earlier step during user
|
||
// expression evaluation.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_push_object_address:
|
||
if (object_address_ptr)
|
||
stack.push_back(*object_address_ptr);
|
||
else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("DW_OP_push_object_address used without "
|
||
"specifying an object address");
|
||
return false;
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_call2
|
||
// OPERANDS:
|
||
// uint16_t compile unit relative offset of a DIE
|
||
// DESCRIPTION: Performs subroutine calls during evaluation
|
||
// of a DWARF expression. The operand is the 2-byte unsigned offset of a
|
||
// debugging information entry in the current compilation unit.
|
||
//
|
||
// Operand interpretation is exactly like that for DW_FORM_ref2.
|
||
//
|
||
// This operation transfers control of DWARF expression evaluation to the
|
||
// DW_AT_location attribute of the referenced DIE. If there is no such
|
||
// attribute, then there is no effect. Execution of the DWARF expression of
|
||
// a DW_AT_location attribute may add to and/or remove from values on the
|
||
// stack. Execution returns to the point following the call when the end of
|
||
// the attribute is reached. Values on the stack at the time of the call
|
||
// may be used as parameters by the called expression and values left on
|
||
// the stack by the called expression may be used as return values by prior
|
||
// agreement between the calling and called expressions.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_call2:
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Unimplemented opcode DW_OP_call2.");
|
||
return false;
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_call4
|
||
// OPERANDS: 1
|
||
// uint32_t compile unit relative offset of a DIE
|
||
// DESCRIPTION: Performs a subroutine call during evaluation of a DWARF
|
||
// expression. For DW_OP_call4, the operand is a 4-byte unsigned offset of
|
||
// a debugging information entry in the current compilation unit.
|
||
//
|
||
// Operand interpretation DW_OP_call4 is exactly like that for
|
||
// DW_FORM_ref4.
|
||
//
|
||
// This operation transfers control of DWARF expression evaluation to the
|
||
// DW_AT_location attribute of the referenced DIE. If there is no such
|
||
// attribute, then there is no effect. Execution of the DWARF expression of
|
||
// a DW_AT_location attribute may add to and/or remove from values on the
|
||
// stack. Execution returns to the point following the call when the end of
|
||
// the attribute is reached. Values on the stack at the time of the call
|
||
// may be used as parameters by the called expression and values left on
|
||
// the stack by the called expression may be used as return values by prior
|
||
// agreement between the calling and called expressions.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_call4:
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Unimplemented opcode DW_OP_call4.");
|
||
return false;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_stack_value
|
||
// OPERANDS: None
|
||
// DESCRIPTION: Specifies that the object does not exist in memory but
|
||
// rather is a constant value. The value from the top of the stack is the
|
||
// value to be used. This is the actual object value and not the location.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_stack_value:
|
||
stack.back().SetValueType(Value::eValueTypeScalar);
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_call_frame_cfa
|
||
// OPERANDS: None
|
||
// DESCRIPTION: Specifies a DWARF expression that pushes the value of
|
||
// the canonical frame address consistent with the call frame information
|
||
// located in .debug_frame (or in the FDEs of the eh_frame section).
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_call_frame_cfa:
|
||
if (frame) {
|
||
// Note that we don't have to parse FDEs because this DWARF expression
|
||
// is commonly evaluated with a valid stack frame.
|
||
StackID id = frame->GetStackID();
|
||
addr_t cfa = id.GetCallFrameAddress();
|
||
if (cfa != LLDB_INVALID_ADDRESS) {
|
||
stack.push_back(Scalar(cfa));
|
||
stack.back().SetValueType(Value::eValueTypeLoadAddress);
|
||
} else if (error_ptr)
|
||
error_ptr->SetErrorString("Stack frame does not include a canonical "
|
||
"frame address for DW_OP_call_frame_cfa "
|
||
"opcode.");
|
||
} else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Invalid stack frame in context for "
|
||
"DW_OP_call_frame_cfa opcode.");
|
||
return false;
|
||
}
|
||
break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_form_tls_address (or the old pre-DWARFv3 vendor extension
|
||
// opcode, DW_OP_GNU_push_tls_address)
|
||
// OPERANDS: none
|
||
// DESCRIPTION: Pops a TLS offset from the stack, converts it to
|
||
// an address in the current thread's thread-local storage block, and
|
||
// pushes it on the stack.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_form_tls_address:
|
||
case DW_OP_GNU_push_tls_address: {
|
||
if (stack.size() < 1) {
|
||
if (error_ptr) {
|
||
if (op == DW_OP_form_tls_address)
|
||
error_ptr->SetErrorString(
|
||
"DW_OP_form_tls_address needs an argument.");
|
||
else
|
||
error_ptr->SetErrorString(
|
||
"DW_OP_GNU_push_tls_address needs an argument.");
|
||
}
|
||
return false;
|
||
}
|
||
|
||
if (!exe_ctx || !module_sp) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("No context to evaluate TLS within.");
|
||
return false;
|
||
}
|
||
|
||
Thread *thread = exe_ctx->GetThreadPtr();
|
||
if (!thread) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("No thread to evaluate TLS within.");
|
||
return false;
|
||
}
|
||
|
||
// Lookup the TLS block address for this thread and module.
|
||
const addr_t tls_file_addr =
|
||
stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
|
||
const addr_t tls_load_addr =
|
||
thread->GetThreadLocalData(module_sp, tls_file_addr);
|
||
|
||
if (tls_load_addr == LLDB_INVALID_ADDRESS) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString(
|
||
"No TLS data currently exists for this thread.");
|
||
return false;
|
||
}
|
||
|
||
stack.back().GetScalar() = tls_load_addr;
|
||
stack.back().SetValueType(Value::eValueTypeLoadAddress);
|
||
} break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_GNU_addr_index
|
||
// OPERANDS: 1
|
||
// ULEB128: index to the .debug_addr section
|
||
// DESCRIPTION: Pushes an address to the stack from the .debug_addr
|
||
// section with the base address specified by the DW_AT_addr_base attribute
|
||
// and the 0 based index is the ULEB128 encoded index.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_GNU_addr_index: {
|
||
if (!dwarf_cu) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("DW_OP_GNU_addr_index found without a "
|
||
"compile unit being specified");
|
||
return false;
|
||
}
|
||
uint64_t index = opcodes.GetULEB128(&offset);
|
||
uint32_t index_size = dwarf_cu->GetAddressByteSize();
|
||
dw_offset_t addr_base = dwarf_cu->GetAddrBase();
|
||
lldb::offset_t offset = addr_base + index * index_size;
|
||
uint64_t value =
|
||
dwarf_cu->GetSymbolFileDWARF()->get_debug_addr_data().GetMaxU64(
|
||
&offset, index_size);
|
||
stack.push_back(Scalar(value));
|
||
stack.back().SetValueType(Value::eValueTypeFileAddress);
|
||
} break;
|
||
|
||
//----------------------------------------------------------------------
|
||
// OPCODE: DW_OP_GNU_const_index
|
||
// OPERANDS: 1
|
||
// ULEB128: index to the .debug_addr section
|
||
// DESCRIPTION: Pushes an constant with the size of a machine address to
|
||
// the stack from the .debug_addr section with the base address specified
|
||
// by the DW_AT_addr_base attribute and the 0 based index is the ULEB128
|
||
// encoded index.
|
||
//----------------------------------------------------------------------
|
||
case DW_OP_GNU_const_index: {
|
||
if (!dwarf_cu) {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("DW_OP_GNU_const_index found without a "
|
||
"compile unit being specified");
|
||
return false;
|
||
}
|
||
uint64_t index = opcodes.GetULEB128(&offset);
|
||
uint32_t index_size = dwarf_cu->GetAddressByteSize();
|
||
dw_offset_t addr_base = dwarf_cu->GetAddrBase();
|
||
lldb::offset_t offset = addr_base + index * index_size;
|
||
const DWARFDataExtractor &debug_addr =
|
||
dwarf_cu->GetSymbolFileDWARF()->get_debug_addr_data();
|
||
switch (index_size) {
|
||
case 4:
|
||
stack.push_back(Scalar(debug_addr.GetU32(&offset)));
|
||
break;
|
||
case 8:
|
||
stack.push_back(Scalar(debug_addr.GetU64(&offset)));
|
||
break;
|
||
default:
|
||
assert(false && "Unhandled index size");
|
||
return false;
|
||
}
|
||
} break;
|
||
|
||
default:
|
||
if (log)
|
||
log->Printf("Unhandled opcode %s in DWARFExpression.",
|
||
DW_OP_value_to_name(op));
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (stack.empty()) {
|
||
// Nothing on the stack, check if we created a piece value from DW_OP_piece
|
||
// or DW_OP_bit_piece opcodes
|
||
if (pieces.GetBuffer().GetByteSize()) {
|
||
result = pieces;
|
||
} else {
|
||
if (error_ptr)
|
||
error_ptr->SetErrorString("Stack empty after evaluation.");
|
||
return false;
|
||
}
|
||
} else {
|
||
if (log && log->GetVerbose()) {
|
||
size_t count = stack.size();
|
||
log->Printf("Stack after operation has %" PRIu64 " values:",
|
||
(uint64_t)count);
|
||
for (size_t i = 0; i < count; ++i) {
|
||
StreamString new_value;
|
||
new_value.Printf("[%" PRIu64 "]", (uint64_t)i);
|
||
stack[i].Dump(&new_value);
|
||
log->Printf(" %s", new_value.GetData());
|
||
}
|
||
}
|
||
result = stack.back();
|
||
}
|
||
return true; // Return true on success
|
||
}
|
||
|
||
size_t DWARFExpression::LocationListSize(const DWARFUnit *dwarf_cu,
|
||
const DataExtractor &debug_loc_data,
|
||
lldb::offset_t offset) {
|
||
const lldb::offset_t debug_loc_offset = offset;
|
||
while (debug_loc_data.ValidOffset(offset)) {
|
||
lldb::addr_t start_addr = LLDB_INVALID_ADDRESS;
|
||
lldb::addr_t end_addr = LLDB_INVALID_ADDRESS;
|
||
if (!AddressRangeForLocationListEntry(dwarf_cu, debug_loc_data, &offset,
|
||
start_addr, end_addr))
|
||
break;
|
||
|
||
if (start_addr == 0 && end_addr == 0)
|
||
break;
|
||
|
||
uint16_t loc_length = debug_loc_data.GetU16(&offset);
|
||
offset += loc_length;
|
||
}
|
||
|
||
if (offset > debug_loc_offset)
|
||
return offset - debug_loc_offset;
|
||
return 0;
|
||
}
|
||
|
||
bool DWARFExpression::AddressRangeForLocationListEntry(
|
||
const DWARFUnit *dwarf_cu, const DataExtractor &debug_loc_data,
|
||
lldb::offset_t *offset_ptr, lldb::addr_t &low_pc, lldb::addr_t &high_pc) {
|
||
if (!debug_loc_data.ValidOffset(*offset_ptr))
|
||
return false;
|
||
|
||
DWARFExpression::LocationListFormat format =
|
||
dwarf_cu->GetSymbolFileDWARF()->GetLocationListFormat();
|
||
switch (format) {
|
||
case NonLocationList:
|
||
return false;
|
||
case RegularLocationList:
|
||
low_pc = debug_loc_data.GetAddress(offset_ptr);
|
||
high_pc = debug_loc_data.GetAddress(offset_ptr);
|
||
return true;
|
||
case SplitDwarfLocationList:
|
||
case LocLists:
|
||
switch (debug_loc_data.GetU8(offset_ptr)) {
|
||
case DW_LLE_end_of_list:
|
||
return false;
|
||
case DW_LLE_startx_endx: {
|
||
uint64_t index = debug_loc_data.GetULEB128(offset_ptr);
|
||
low_pc = ReadAddressFromDebugAddrSection(dwarf_cu, index);
|
||
index = debug_loc_data.GetULEB128(offset_ptr);
|
||
high_pc = ReadAddressFromDebugAddrSection(dwarf_cu, index);
|
||
return true;
|
||
}
|
||
case DW_LLE_startx_length: {
|
||
uint64_t index = debug_loc_data.GetULEB128(offset_ptr);
|
||
low_pc = ReadAddressFromDebugAddrSection(dwarf_cu, index);
|
||
uint64_t length = (format == LocLists)
|
||
? debug_loc_data.GetULEB128(offset_ptr)
|
||
: debug_loc_data.GetU32(offset_ptr);
|
||
high_pc = low_pc + length;
|
||
return true;
|
||
}
|
||
case DW_LLE_start_length: {
|
||
low_pc = debug_loc_data.GetAddress(offset_ptr);
|
||
high_pc = low_pc + debug_loc_data.GetULEB128(offset_ptr);
|
||
return true;
|
||
}
|
||
case DW_LLE_start_end: {
|
||
low_pc = debug_loc_data.GetAddress(offset_ptr);
|
||
high_pc = debug_loc_data.GetAddress(offset_ptr);
|
||
return true;
|
||
}
|
||
default:
|
||
// Not supported entry type
|
||
lldbassert(false && "Not supported location list type");
|
||
return false;
|
||
}
|
||
}
|
||
assert(false && "Not supported location list type");
|
||
return false;
|
||
}
|
||
|
||
static bool print_dwarf_exp_op(Stream &s, const DataExtractor &data,
|
||
lldb::offset_t *offset_ptr, int address_size,
|
||
int dwarf_ref_size) {
|
||
uint8_t opcode = data.GetU8(offset_ptr);
|
||
DRC_class opcode_class;
|
||
uint64_t uint;
|
||
int64_t sint;
|
||
|
||
int size;
|
||
|
||
opcode_class = DW_OP_value_to_class(opcode) & (~DRC_DWARFv3);
|
||
|
||
s.Printf("%s ", DW_OP_value_to_name(opcode));
|
||
|
||
/* Does this take zero parameters? If so we can shortcut this function. */
|
||
if (opcode_class == DRC_ZEROOPERANDS)
|
||
return true;
|
||
|
||
if (opcode_class == DRC_TWOOPERANDS && opcode == DW_OP_bregx) {
|
||
uint = data.GetULEB128(offset_ptr);
|
||
sint = data.GetSLEB128(offset_ptr);
|
||
s.Printf("%" PRIu64 " %" PRIi64, uint, sint);
|
||
return true;
|
||
}
|
||
if (opcode_class != DRC_ONEOPERAND) {
|
||
s.Printf("UNKNOWN OP %u", opcode);
|
||
return false;
|
||
}
|
||
|
||
switch (opcode) {
|
||
case DW_OP_addr:
|
||
size = address_size;
|
||
break;
|
||
case DW_OP_const1u:
|
||
size = 1;
|
||
break;
|
||
case DW_OP_const1s:
|
||
size = -1;
|
||
break;
|
||
case DW_OP_const2u:
|
||
size = 2;
|
||
break;
|
||
case DW_OP_const2s:
|
||
size = -2;
|
||
break;
|
||
case DW_OP_const4u:
|
||
size = 4;
|
||
break;
|
||
case DW_OP_const4s:
|
||
size = -4;
|
||
break;
|
||
case DW_OP_const8u:
|
||
size = 8;
|
||
break;
|
||
case DW_OP_const8s:
|
||
size = -8;
|
||
break;
|
||
case DW_OP_constu:
|
||
size = 128;
|
||
break;
|
||
case DW_OP_consts:
|
||
size = -128;
|
||
break;
|
||
case DW_OP_fbreg:
|
||
size = -128;
|
||
break;
|
||
case DW_OP_breg0:
|
||
case DW_OP_breg1:
|
||
case DW_OP_breg2:
|
||
case DW_OP_breg3:
|
||
case DW_OP_breg4:
|
||
case DW_OP_breg5:
|
||
case DW_OP_breg6:
|
||
case DW_OP_breg7:
|
||
case DW_OP_breg8:
|
||
case DW_OP_breg9:
|
||
case DW_OP_breg10:
|
||
case DW_OP_breg11:
|
||
case DW_OP_breg12:
|
||
case DW_OP_breg13:
|
||
case DW_OP_breg14:
|
||
case DW_OP_breg15:
|
||
case DW_OP_breg16:
|
||
case DW_OP_breg17:
|
||
case DW_OP_breg18:
|
||
case DW_OP_breg19:
|
||
case DW_OP_breg20:
|
||
case DW_OP_breg21:
|
||
case DW_OP_breg22:
|
||
case DW_OP_breg23:
|
||
case DW_OP_breg24:
|
||
case DW_OP_breg25:
|
||
case DW_OP_breg26:
|
||
case DW_OP_breg27:
|
||
case DW_OP_breg28:
|
||
case DW_OP_breg29:
|
||
case DW_OP_breg30:
|
||
case DW_OP_breg31:
|
||
size = -128;
|
||
break;
|
||
case DW_OP_pick:
|
||
case DW_OP_deref_size:
|
||
case DW_OP_xderef_size:
|
||
size = 1;
|
||
break;
|
||
case DW_OP_skip:
|
||
case DW_OP_bra:
|
||
size = -2;
|
||
break;
|
||
case DW_OP_call2:
|
||
size = 2;
|
||
break;
|
||
case DW_OP_call4:
|
||
size = 4;
|
||
break;
|
||
case DW_OP_call_ref:
|
||
size = dwarf_ref_size;
|
||
break;
|
||
case DW_OP_piece:
|
||
case DW_OP_plus_uconst:
|
||
case DW_OP_regx:
|
||
case DW_OP_GNU_addr_index:
|
||
case DW_OP_GNU_const_index:
|
||
size = 128;
|
||
break;
|
||
default:
|
||
s.Printf("UNKNOWN ONE-OPERAND OPCODE, #%u", opcode);
|
||
return true;
|
||
}
|
||
|
||
switch (size) {
|
||
case -1:
|
||
sint = (int8_t)data.GetU8(offset_ptr);
|
||
s.Printf("%+" PRIi64, sint);
|
||
break;
|
||
case -2:
|
||
sint = (int16_t)data.GetU16(offset_ptr);
|
||
s.Printf("%+" PRIi64, sint);
|
||
break;
|
||
case -4:
|
||
sint = (int32_t)data.GetU32(offset_ptr);
|
||
s.Printf("%+" PRIi64, sint);
|
||
break;
|
||
case -8:
|
||
sint = (int64_t)data.GetU64(offset_ptr);
|
||
s.Printf("%+" PRIi64, sint);
|
||
break;
|
||
case -128:
|
||
sint = data.GetSLEB128(offset_ptr);
|
||
s.Printf("%+" PRIi64, sint);
|
||
break;
|
||
case 1:
|
||
uint = data.GetU8(offset_ptr);
|
||
s.Printf("0x%2.2" PRIx64, uint);
|
||
break;
|
||
case 2:
|
||
uint = data.GetU16(offset_ptr);
|
||
s.Printf("0x%4.4" PRIx64, uint);
|
||
break;
|
||
case 4:
|
||
uint = data.GetU32(offset_ptr);
|
||
s.Printf("0x%8.8" PRIx64, uint);
|
||
break;
|
||
case 8:
|
||
uint = data.GetU64(offset_ptr);
|
||
s.Printf("0x%16.16" PRIx64, uint);
|
||
break;
|
||
case 128:
|
||
uint = data.GetULEB128(offset_ptr);
|
||
s.Printf("0x%" PRIx64, uint);
|
||
break;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
bool DWARFExpression::PrintDWARFExpression(Stream &s, const DataExtractor &data,
|
||
int address_size, int dwarf_ref_size,
|
||
bool location_expression) {
|
||
int op_count = 0;
|
||
lldb::offset_t offset = 0;
|
||
while (data.ValidOffset(offset)) {
|
||
if (location_expression && op_count > 0)
|
||
return false;
|
||
if (op_count > 0)
|
||
s.PutCString(", ");
|
||
if (!print_dwarf_exp_op(s, data, &offset, address_size, dwarf_ref_size))
|
||
return false;
|
||
op_count++;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
void DWARFExpression::PrintDWARFLocationList(
|
||
Stream &s, const DWARFUnit *cu, const DataExtractor &debug_loc_data,
|
||
lldb::offset_t offset) {
|
||
uint64_t start_addr, end_addr;
|
||
uint32_t addr_size = DWARFUnit::GetAddressByteSize(cu);
|
||
s.SetAddressByteSize(DWARFUnit::GetAddressByteSize(cu));
|
||
dw_addr_t base_addr = cu ? cu->GetBaseAddress() : 0;
|
||
while (debug_loc_data.ValidOffset(offset)) {
|
||
start_addr = debug_loc_data.GetMaxU64(&offset, addr_size);
|
||
end_addr = debug_loc_data.GetMaxU64(&offset, addr_size);
|
||
|
||
if (start_addr == 0 && end_addr == 0)
|
||
break;
|
||
|
||
s.PutCString("\n ");
|
||
s.Indent();
|
||
if (cu)
|
||
s.AddressRange(start_addr + base_addr, end_addr + base_addr,
|
||
cu->GetAddressByteSize(), NULL, ": ");
|
||
uint32_t loc_length = debug_loc_data.GetU16(&offset);
|
||
|
||
DataExtractor locationData(debug_loc_data, offset, loc_length);
|
||
PrintDWARFExpression(s, locationData, addr_size, 4, false);
|
||
offset += loc_length;
|
||
}
|
||
}
|
||
|
||
bool DWARFExpression::GetOpAndEndOffsets(StackFrame &frame,
|
||
lldb::offset_t &op_offset,
|
||
lldb::offset_t &end_offset) {
|
||
SymbolContext sc = frame.GetSymbolContext(eSymbolContextFunction);
|
||
if (!sc.function) {
|
||
return false;
|
||
}
|
||
|
||
addr_t loclist_base_file_addr =
|
||
sc.function->GetAddressRange().GetBaseAddress().GetFileAddress();
|
||
if (loclist_base_file_addr == LLDB_INVALID_ADDRESS) {
|
||
return false;
|
||
}
|
||
|
||
addr_t pc_file_addr = frame.GetFrameCodeAddress().GetFileAddress();
|
||
lldb::offset_t opcodes_offset, opcodes_length;
|
||
if (!GetLocation(loclist_base_file_addr, pc_file_addr, opcodes_offset,
|
||
opcodes_length)) {
|
||
return false;
|
||
}
|
||
|
||
if (opcodes_length == 0) {
|
||
return false;
|
||
}
|
||
|
||
op_offset = opcodes_offset;
|
||
end_offset = opcodes_offset + opcodes_length;
|
||
return true;
|
||
}
|
||
|
||
bool DWARFExpression::MatchesOperand(StackFrame &frame,
|
||
const Instruction::Operand &operand) {
|
||
using namespace OperandMatchers;
|
||
|
||
lldb::offset_t op_offset;
|
||
lldb::offset_t end_offset;
|
||
if (!GetOpAndEndOffsets(frame, op_offset, end_offset)) {
|
||
return false;
|
||
}
|
||
|
||
if (!m_data.ValidOffset(op_offset) || op_offset >= end_offset) {
|
||
return false;
|
||
}
|
||
|
||
RegisterContextSP reg_ctx_sp = frame.GetRegisterContext();
|
||
if (!reg_ctx_sp) {
|
||
return false;
|
||
}
|
||
|
||
DataExtractor opcodes = m_data;
|
||
uint8_t opcode = opcodes.GetU8(&op_offset);
|
||
|
||
if (opcode == DW_OP_fbreg) {
|
||
int64_t offset = opcodes.GetSLEB128(&op_offset);
|
||
|
||
DWARFExpression *fb_expr = frame.GetFrameBaseExpression(nullptr);
|
||
if (!fb_expr) {
|
||
return false;
|
||
}
|
||
|
||
auto recurse = [&frame, fb_expr](const Instruction::Operand &child) {
|
||
return fb_expr->MatchesOperand(frame, child);
|
||
};
|
||
|
||
if (!offset &&
|
||
MatchUnaryOp(MatchOpType(Instruction::Operand::Type::Dereference),
|
||
recurse)(operand)) {
|
||
return true;
|
||
}
|
||
|
||
return MatchUnaryOp(
|
||
MatchOpType(Instruction::Operand::Type::Dereference),
|
||
MatchBinaryOp(MatchOpType(Instruction::Operand::Type::Sum),
|
||
MatchImmOp(offset), recurse))(operand);
|
||
}
|
||
|
||
bool dereference = false;
|
||
const RegisterInfo *reg = nullptr;
|
||
int64_t offset = 0;
|
||
|
||
if (opcode >= DW_OP_reg0 && opcode <= DW_OP_reg31) {
|
||
reg = reg_ctx_sp->GetRegisterInfo(m_reg_kind, opcode - DW_OP_reg0);
|
||
} else if (opcode >= DW_OP_breg0 && opcode <= DW_OP_breg31) {
|
||
offset = opcodes.GetSLEB128(&op_offset);
|
||
reg = reg_ctx_sp->GetRegisterInfo(m_reg_kind, opcode - DW_OP_breg0);
|
||
} else if (opcode == DW_OP_regx) {
|
||
uint32_t reg_num = static_cast<uint32_t>(opcodes.GetULEB128(&op_offset));
|
||
reg = reg_ctx_sp->GetRegisterInfo(m_reg_kind, reg_num);
|
||
} else if (opcode == DW_OP_bregx) {
|
||
uint32_t reg_num = static_cast<uint32_t>(opcodes.GetULEB128(&op_offset));
|
||
offset = opcodes.GetSLEB128(&op_offset);
|
||
reg = reg_ctx_sp->GetRegisterInfo(m_reg_kind, reg_num);
|
||
} else {
|
||
return false;
|
||
}
|
||
|
||
if (!reg) {
|
||
return false;
|
||
}
|
||
|
||
if (dereference) {
|
||
if (!offset &&
|
||
MatchUnaryOp(MatchOpType(Instruction::Operand::Type::Dereference),
|
||
MatchRegOp(*reg))(operand)) {
|
||
return true;
|
||
}
|
||
|
||
return MatchUnaryOp(
|
||
MatchOpType(Instruction::Operand::Type::Dereference),
|
||
MatchBinaryOp(MatchOpType(Instruction::Operand::Type::Sum),
|
||
MatchRegOp(*reg),
|
||
MatchImmOp(offset)))(operand);
|
||
} else {
|
||
return MatchRegOp(*reg)(operand);
|
||
}
|
||
}
|
||
|