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llvm-project/llvm/lib/DebugInfo/DWARF/DWARFFormValue.cpp

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//===- DWARFFormValue.cpp -------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
#include "SyntaxHighlighting.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/DebugInfo/DWARF/DWARFRelocMap.h"
#include "llvm/DebugInfo/DWARF/DWARFUnit.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <cinttypes>
#include <cstdint>
#include <limits>
using namespace llvm;
using namespace dwarf;
using namespace syntax;
static const DWARFFormValue::FormClass DWARF5FormClasses[] = {
DWARFFormValue::FC_Unknown, // 0x0
DWARFFormValue::FC_Address, // 0x01 DW_FORM_addr
DWARFFormValue::FC_Unknown, // 0x02 unused
DWARFFormValue::FC_Block, // 0x03 DW_FORM_block2
DWARFFormValue::FC_Block, // 0x04 DW_FORM_block4
DWARFFormValue::FC_Constant, // 0x05 DW_FORM_data2
// --- These can be FC_SectionOffset in DWARF3 and below:
DWARFFormValue::FC_Constant, // 0x06 DW_FORM_data4
DWARFFormValue::FC_Constant, // 0x07 DW_FORM_data8
// ---
DWARFFormValue::FC_String, // 0x08 DW_FORM_string
DWARFFormValue::FC_Block, // 0x09 DW_FORM_block
DWARFFormValue::FC_Block, // 0x0a DW_FORM_block1
DWARFFormValue::FC_Constant, // 0x0b DW_FORM_data1
DWARFFormValue::FC_Flag, // 0x0c DW_FORM_flag
DWARFFormValue::FC_Constant, // 0x0d DW_FORM_sdata
DWARFFormValue::FC_String, // 0x0e DW_FORM_strp
DWARFFormValue::FC_Constant, // 0x0f DW_FORM_udata
DWARFFormValue::FC_Reference, // 0x10 DW_FORM_ref_addr
DWARFFormValue::FC_Reference, // 0x11 DW_FORM_ref1
DWARFFormValue::FC_Reference, // 0x12 DW_FORM_ref2
DWARFFormValue::FC_Reference, // 0x13 DW_FORM_ref4
DWARFFormValue::FC_Reference, // 0x14 DW_FORM_ref8
DWARFFormValue::FC_Reference, // 0x15 DW_FORM_ref_udata
DWARFFormValue::FC_Indirect, // 0x16 DW_FORM_indirect
DWARFFormValue::FC_SectionOffset, // 0x17 DW_FORM_sec_offset
DWARFFormValue::FC_Exprloc, // 0x18 DW_FORM_exprloc
DWARFFormValue::FC_Flag, // 0x19 DW_FORM_flag_present
DWARFFormValue::FC_String, // 0x1a DW_FORM_strx
DWARFFormValue::FC_Address, // 0x1b DW_FORM_addrx
DWARFFormValue::FC_Reference, // 0x1c DW_FORM_ref_sup4
DWARFFormValue::FC_String, // 0x1d DW_FORM_strp_sup
DWARFFormValue::FC_Constant, // 0x1e DW_FORM_data16
DWARFFormValue::FC_String, // 0x1f DW_FORM_line_strp
DWARFFormValue::FC_Reference, // 0x20 DW_FORM_ref_sig8
DWARFFormValue::FC_Constant, // 0x21 DW_FORM_implicit_const
DWARFFormValue::FC_SectionOffset, // 0x22 DW_FORM_loclistx
DWARFFormValue::FC_SectionOffset, // 0x23 DW_FORM_rnglistx
DWARFFormValue::FC_Reference, // 0x24 DW_FORM_ref_sup8
DWARFFormValue::FC_String, // 0x25 DW_FORM_strx1
DWARFFormValue::FC_String, // 0x26 DW_FORM_strx2
DWARFFormValue::FC_String, // 0x27 DW_FORM_strx3
DWARFFormValue::FC_String, // 0x28 DW_FORM_strx4
DWARFFormValue::FC_Address, // 0x29 DW_FORM_addrx1
DWARFFormValue::FC_Address, // 0x2a DW_FORM_addrx2
DWARFFormValue::FC_Address, // 0x2b DW_FORM_addrx3
DWARFFormValue::FC_Address, // 0x2c DW_FORM_addrx4
};
Optional<uint8_t>
DWARFFormValue::getFixedByteSize(dwarf::Form Form,
const DWARFFormParams Params) {
switch (Form) {
case DW_FORM_addr:
if (Params)
return Params.AddrSize;
return None;
case DW_FORM_block: // ULEB128 length L followed by L bytes.
case DW_FORM_block1: // 1 byte length L followed by L bytes.
case DW_FORM_block2: // 2 byte length L followed by L bytes.
case DW_FORM_block4: // 4 byte length L followed by L bytes.
case DW_FORM_string: // C-string with null terminator.
case DW_FORM_sdata: // SLEB128.
case DW_FORM_udata: // ULEB128.
case DW_FORM_ref_udata: // ULEB128.
case DW_FORM_indirect: // ULEB128.
case DW_FORM_exprloc: // ULEB128 length L followed by L bytes.
case DW_FORM_strx: // ULEB128.
case DW_FORM_addrx: // ULEB128.
case DW_FORM_loclistx: // ULEB128.
case DW_FORM_rnglistx: // ULEB128.
case DW_FORM_GNU_addr_index: // ULEB128.
case DW_FORM_GNU_str_index: // ULEB128.
return None;
case DW_FORM_ref_addr:
if (Params)
return Params.getRefAddrByteSize();
return None;
case DW_FORM_flag:
case DW_FORM_data1:
case DW_FORM_ref1:
case DW_FORM_strx1:
case DW_FORM_addrx1:
return 1;
case DW_FORM_data2:
case DW_FORM_ref2:
case DW_FORM_strx2:
case DW_FORM_addrx2:
return 2;
case DW_FORM_strx3:
return 3;
case DW_FORM_data4:
case DW_FORM_ref4:
case DW_FORM_ref_sup4:
case DW_FORM_strx4:
case DW_FORM_addrx4:
return 4;
case DW_FORM_strp:
case DW_FORM_GNU_ref_alt:
case DW_FORM_GNU_strp_alt:
case DW_FORM_line_strp:
case DW_FORM_sec_offset:
case DW_FORM_strp_sup:
if (Params)
return Params.getDwarfOffsetByteSize();
return None;
case DW_FORM_data8:
case DW_FORM_ref8:
case DW_FORM_ref_sig8:
case DW_FORM_ref_sup8:
return 8;
case DW_FORM_flag_present:
return 0;
case DW_FORM_data16:
return 16;
case DW_FORM_implicit_const:
// The implicit value is stored in the abbreviation as a SLEB128, and
// there no data in debug info.
return 0;
default:
llvm_unreachable("Handle this form in this switch statement");
}
return None;
}
bool DWARFFormValue::skipValue(dwarf::Form Form, DataExtractor DebugInfoData,
uint32_t *OffsetPtr,
const DWARFFormParams Params) {
bool Indirect = false;
do {
switch (Form) {
// Blocks of inlined data that have a length field and the data bytes
// inlined in the .debug_info.
case DW_FORM_exprloc:
case DW_FORM_block: {
uint64_t size = DebugInfoData.getULEB128(OffsetPtr);
*OffsetPtr += size;
return true;
}
case DW_FORM_block1: {
uint8_t size = DebugInfoData.getU8(OffsetPtr);
*OffsetPtr += size;
return true;
}
case DW_FORM_block2: {
uint16_t size = DebugInfoData.getU16(OffsetPtr);
*OffsetPtr += size;
return true;
}
case DW_FORM_block4: {
uint32_t size = DebugInfoData.getU32(OffsetPtr);
*OffsetPtr += size;
return true;
}
// Inlined NULL terminated C-strings.
case DW_FORM_string:
DebugInfoData.getCStr(OffsetPtr);
return true;
case DW_FORM_addr:
case DW_FORM_ref_addr:
case DW_FORM_flag_present:
case DW_FORM_data1:
case DW_FORM_data2:
case DW_FORM_data4:
case DW_FORM_data8:
case DW_FORM_data16:
case DW_FORM_flag:
case DW_FORM_ref1:
case DW_FORM_ref2:
case DW_FORM_ref4:
case DW_FORM_ref8:
case DW_FORM_ref_sig8:
case DW_FORM_ref_sup4:
case DW_FORM_ref_sup8:
case DW_FORM_strx1:
case DW_FORM_strx2:
case DW_FORM_strx4:
case DW_FORM_addrx1:
case DW_FORM_addrx2:
case DW_FORM_addrx4:
case DW_FORM_sec_offset:
case DW_FORM_strp:
case DW_FORM_strp_sup:
case DW_FORM_line_strp:
case DW_FORM_GNU_ref_alt:
case DW_FORM_GNU_strp_alt:
if (Optional<uint8_t> FixedSize =
DWARFFormValue::getFixedByteSize(Form, Params)) {
*OffsetPtr += *FixedSize;
return true;
}
return false;
// signed or unsigned LEB 128 values.
case DW_FORM_sdata:
DebugInfoData.getSLEB128(OffsetPtr);
return true;
case DW_FORM_udata:
case DW_FORM_ref_udata:
case DW_FORM_strx:
case DW_FORM_addrx:
case DW_FORM_loclistx:
case DW_FORM_rnglistx:
case DW_FORM_GNU_addr_index:
case DW_FORM_GNU_str_index:
DebugInfoData.getULEB128(OffsetPtr);
return true;
case DW_FORM_indirect:
Indirect = true;
Form = static_cast<dwarf::Form>(DebugInfoData.getULEB128(OffsetPtr));
break;
default:
return false;
}
} while (Indirect);
return true;
}
bool DWARFFormValue::isFormClass(DWARFFormValue::FormClass FC) const {
// First, check DWARF5 form classes.
if (Form < makeArrayRef(DWARF5FormClasses).size() &&
DWARF5FormClasses[Form] == FC)
return true;
// Check more forms from extensions and proposals.
switch (Form) {
case DW_FORM_GNU_ref_alt:
return (FC == FC_Reference);
case DW_FORM_GNU_addr_index:
return (FC == FC_Address);
case DW_FORM_GNU_str_index:
case DW_FORM_GNU_strp_alt:
return (FC == FC_String);
default:
break;
}
// In DWARF3 DW_FORM_data4 and DW_FORM_data8 served also as a section offset.
// Don't check for DWARF version here, as some producers may still do this
// by mistake. Also accept DW_FORM_[line_]strp since these are
// .debug_[line_]str section offsets.
return (Form == DW_FORM_data4 || Form == DW_FORM_data8 ||
Form == DW_FORM_strp || Form == DW_FORM_line_strp) &&
FC == FC_SectionOffset;
}
bool DWARFFormValue::extractValue(const DWARFDataExtractor &Data,
uint32_t *OffsetPtr, DWARFFormParams FP,
const DWARFContext *Ctx,
const DWARFUnit *CU) {
if (!Ctx && CU)
Ctx = &CU->getContext();
C = Ctx;
U = CU;
bool Indirect = false;
bool IsBlock = false;
Value.data = nullptr;
// Read the value for the form into value and follow and DW_FORM_indirect
// instances we run into
do {
Indirect = false;
switch (Form) {
case DW_FORM_addr:
case DW_FORM_ref_addr: {
uint16_t Size =
(Form == DW_FORM_addr) ? FP.AddrSize : FP.getRefAddrByteSize();
Value.uval = Data.getRelocatedValue(Size, OffsetPtr, &Value.SectionIndex);
break;
}
case DW_FORM_exprloc:
case DW_FORM_block:
Value.uval = Data.getULEB128(OffsetPtr);
IsBlock = true;
break;
case DW_FORM_block1:
Value.uval = Data.getU8(OffsetPtr);
IsBlock = true;
break;
case DW_FORM_block2:
Value.uval = Data.getU16(OffsetPtr);
IsBlock = true;
break;
case DW_FORM_block4:
Value.uval = Data.getU32(OffsetPtr);
IsBlock = true;
break;
case DW_FORM_data1:
case DW_FORM_ref1:
case DW_FORM_flag:
case DW_FORM_strx1:
case DW_FORM_addrx1:
Value.uval = Data.getU8(OffsetPtr);
break;
case DW_FORM_data2:
case DW_FORM_ref2:
case DW_FORM_strx2:
case DW_FORM_addrx2:
Value.uval = Data.getU16(OffsetPtr);
break;
case DW_FORM_strx3:
Value.uval = Data.getU24(OffsetPtr);
break;
case DW_FORM_data4:
case DW_FORM_ref4:
case DW_FORM_ref_sup4:
case DW_FORM_strx4:
case DW_FORM_addrx4:
Value.uval = Data.getRelocatedValue(4, OffsetPtr);
break;
case DW_FORM_data8:
case DW_FORM_ref8:
case DW_FORM_ref_sup8:
Value.uval = Data.getU64(OffsetPtr);
break;
case DW_FORM_data16:
// Treat this like a 16-byte block.
Value.uval = 16;
IsBlock = true;
break;
case DW_FORM_sdata:
Value.sval = Data.getSLEB128(OffsetPtr);
break;
case DW_FORM_udata:
case DW_FORM_ref_udata:
Value.uval = Data.getULEB128(OffsetPtr);
break;
case DW_FORM_string:
Value.cstr = Data.getCStr(OffsetPtr);
break;
case DW_FORM_indirect:
Form = static_cast<dwarf::Form>(Data.getULEB128(OffsetPtr));
Indirect = true;
break;
case DW_FORM_strp:
case DW_FORM_sec_offset:
case DW_FORM_GNU_ref_alt:
case DW_FORM_GNU_strp_alt:
case DW_FORM_line_strp:
case DW_FORM_strp_sup: {
Value.uval =
Data.getRelocatedValue(FP.getDwarfOffsetByteSize(), OffsetPtr);
break;
}
case DW_FORM_flag_present:
Value.uval = 1;
break;
case DW_FORM_ref_sig8:
Value.uval = Data.getU64(OffsetPtr);
break;
case DW_FORM_GNU_addr_index:
case DW_FORM_GNU_str_index:
case DW_FORM_strx:
Value.uval = Data.getULEB128(OffsetPtr);
break;
default:
// DWARFFormValue::skipValue() will have caught this and caused all
// DWARF DIEs to fail to be parsed, so this code is not be reachable.
llvm_unreachable("unsupported form");
}
} while (Indirect);
if (IsBlock) {
StringRef Str = Data.getData().substr(*OffsetPtr, Value.uval);
Value.data = nullptr;
if (!Str.empty()) {
Value.data = reinterpret_cast<const uint8_t *>(Str.data());
*OffsetPtr += Value.uval;
}
}
return true;
}
void DWARFFormValue::dump(raw_ostream &OS, DIDumpOptions DumpOpts) const {
uint64_t UValue = Value.uval;
bool CURelativeOffset = false;
raw_ostream &AddrOS =
DumpOpts.ShowAddresses ? WithColor(OS, syntax::Address).get() : nulls();
switch (Form) {
case DW_FORM_addr:
AddrOS << format("0x%016" PRIx64, UValue);
break;
case DW_FORM_GNU_addr_index: {
AddrOS << format(" indexed (%8.8x) address = ", (uint32_t)UValue);
uint64_t Address;
if (U == nullptr)
OS << "<invalid dwarf unit>";
else if (U->getAddrOffsetSectionItem(UValue, Address))
AddrOS << format("0x%016" PRIx64, Address);
else
OS << "<no .debug_addr section>";
break;
}
case DW_FORM_flag_present:
OS << "true";
break;
case DW_FORM_flag:
case DW_FORM_data1:
OS << format("0x%02x", (uint8_t)UValue);
break;
case DW_FORM_data2:
OS << format("0x%04x", (uint16_t)UValue);
break;
case DW_FORM_data4:
OS << format("0x%08x", (uint32_t)UValue);
break;
case DW_FORM_ref_sig8:
AddrOS << format("0x%016" PRIx64, UValue);
break;
case DW_FORM_data8:
OS << format("0x%016" PRIx64, UValue);
break;
case DW_FORM_data16:
OS << format_bytes(ArrayRef<uint8_t>(Value.data, 16), None, 16, 16);
break;
case DW_FORM_string:
OS << '"';
OS.write_escaped(Value.cstr);
OS << '"';
break;
case DW_FORM_exprloc:
case DW_FORM_block:
case DW_FORM_block1:
case DW_FORM_block2:
case DW_FORM_block4:
if (UValue > 0) {
switch (Form) {
case DW_FORM_exprloc:
case DW_FORM_block:
OS << format("<0x%" PRIx64 "> ", UValue);
break;
case DW_FORM_block1:
OS << format("<0x%2.2x> ", (uint8_t)UValue);
break;
case DW_FORM_block2:
OS << format("<0x%4.4x> ", (uint16_t)UValue);
break;
case DW_FORM_block4:
OS << format("<0x%8.8x> ", (uint32_t)UValue);
break;
default:
break;
}
const uint8_t *DataPtr = Value.data;
if (DataPtr) {
// UValue contains size of block
const uint8_t *EndDataPtr = DataPtr + UValue;
while (DataPtr < EndDataPtr) {
OS << format("%2.2x ", *DataPtr);
++DataPtr;
}
} else
OS << "NULL";
}
break;
case DW_FORM_sdata:
OS << Value.sval;
break;
case DW_FORM_udata:
OS << Value.uval;
break;
case DW_FORM_strp:
if (DumpOpts.Verbose)
OS << format(" .debug_str[0x%8.8x] = ", (uint32_t)UValue);
dumpString(OS);
break;
case DW_FORM_line_strp:
if (DumpOpts.Verbose)
OS << format(" .debug_line_str[0x%8.8x] = ", (uint32_t)UValue);
dumpString(OS);
break;
case DW_FORM_strx:
case DW_FORM_strx1:
case DW_FORM_strx2:
case DW_FORM_strx3:
case DW_FORM_strx4:
case DW_FORM_GNU_str_index:
if (DumpOpts.Verbose)
OS << format(" indexed (%8.8x) string = ", (uint32_t)UValue);
dumpString(OS);
break;
case DW_FORM_GNU_strp_alt:
if (DumpOpts.Verbose)
OS << format("alt indirect string, offset: 0x%" PRIx64 "", UValue);
dumpString(OS);
break;
case DW_FORM_ref_addr:
AddrOS << format("0x%016" PRIx64, UValue);
break;
case DW_FORM_ref1:
CURelativeOffset = true;
if (DumpOpts.Verbose)
AddrOS << format("cu + 0x%2.2x", (uint8_t)UValue);
break;
case DW_FORM_ref2:
CURelativeOffset = true;
if (DumpOpts.Verbose)
AddrOS << format("cu + 0x%4.4x", (uint16_t)UValue);
break;
case DW_FORM_ref4:
CURelativeOffset = true;
if (DumpOpts.Verbose)
AddrOS << format("cu + 0x%4.4x", (uint32_t)UValue);
break;
case DW_FORM_ref8:
CURelativeOffset = true;
if (DumpOpts.Verbose)
AddrOS << format("cu + 0x%8.8" PRIx64, UValue);
break;
case DW_FORM_ref_udata:
CURelativeOffset = true;
if (DumpOpts.Verbose)
AddrOS << format("cu + 0x%" PRIx64, UValue);
break;
case DW_FORM_GNU_ref_alt:
AddrOS << format("<alt 0x%" PRIx64 ">", UValue);
break;
// All DW_FORM_indirect attributes should be resolved prior to calling
// this function
case DW_FORM_indirect:
OS << "DW_FORM_indirect";
break;
// Should be formatted to 64-bit for DWARF64.
case DW_FORM_sec_offset:
AddrOS << format("0x%08x", (uint32_t)UValue);
break;
default:
OS << format("DW_FORM(0x%4.4x)", Form);
break;
}
if (CURelativeOffset) {
if (DumpOpts.Verbose)
OS << " => {";
WithColor(OS, syntax::Address).get()
<< format("0x%8.8" PRIx64, UValue + (U ? U->getOffset() : 0));
if (DumpOpts.Verbose)
OS << "}";
}
}
void DWARFFormValue::dumpString(raw_ostream &OS) const {
Optional<const char *> DbgStr = getAsCString();
if (DbgStr.hasValue()) {
auto COS = WithColor(OS, syntax::String);
COS.get() << '"';
COS.get().write_escaped(DbgStr.getValue());
COS.get() << '"';
}
}
Optional<const char *> DWARFFormValue::getAsCString() const {
if (!isFormClass(FC_String))
return None;
if (Form == DW_FORM_string)
return Value.cstr;
// FIXME: Add support for DW_FORM_GNU_strp_alt
if (Form == DW_FORM_GNU_strp_alt || C == nullptr)
return None;
uint32_t Offset = Value.uval;
if (Form == DW_FORM_line_strp) {
// .debug_line_str is tracked in the Context.
if (const char *Str = C->getLineStringExtractor().getCStr(&Offset))
return Str;
return None;
}
if (Form == DW_FORM_GNU_str_index || Form == DW_FORM_strx ||
Form == DW_FORM_strx1 || Form == DW_FORM_strx2 || Form == DW_FORM_strx3 ||
Form == DW_FORM_strx4) {
uint64_t StrOffset;
if (!U || !U->getStringOffsetSectionItem(Offset, StrOffset))
return None;
Offset = StrOffset;
}
// Prefer the Unit's string extractor, because for .dwo it will point to
// .debug_str.dwo, while the Context's extractor always uses .debug_str.
if (U) {
if (const char *Str = U->getStringExtractor().getCStr(&Offset))
return Str;
return None;
}
if (const char *Str = C->getStringExtractor().getCStr(&Offset))
return Str;
return None;
}
Optional<uint64_t> DWARFFormValue::getAsAddress() const {
if (!isFormClass(FC_Address))
return None;
if (Form == DW_FORM_GNU_addr_index) {
uint32_t Index = Value.uval;
uint64_t Result;
if (!U || !U->getAddrOffsetSectionItem(Index, Result))
return None;
return Result;
}
return Value.uval;
}
Optional<uint64_t> DWARFFormValue::getAsReference() const {
if (!isFormClass(FC_Reference))
return None;
switch (Form) {
case DW_FORM_ref1:
case DW_FORM_ref2:
case DW_FORM_ref4:
case DW_FORM_ref8:
case DW_FORM_ref_udata:
if (!U)
return None;
return Value.uval + U->getOffset();
case DW_FORM_ref_addr:
case DW_FORM_ref_sig8:
case DW_FORM_GNU_ref_alt:
return Value.uval;
default:
return None;
}
}
Optional<uint64_t> DWARFFormValue::getAsSectionOffset() const {
if (!isFormClass(FC_SectionOffset))
return None;
return Value.uval;
}
Optional<uint64_t> DWARFFormValue::getAsUnsignedConstant() const {
if ((!isFormClass(FC_Constant) && !isFormClass(FC_Flag)) ||
Form == DW_FORM_sdata)
return None;
return Value.uval;
}
Optional<int64_t> DWARFFormValue::getAsSignedConstant() const {
if ((!isFormClass(FC_Constant) && !isFormClass(FC_Flag)) ||
(Form == DW_FORM_udata &&
uint64_t(std::numeric_limits<int64_t>::max()) < Value.uval))
return None;
switch (Form) {
case DW_FORM_data4:
return int32_t(Value.uval);
case DW_FORM_data2:
return int16_t(Value.uval);
case DW_FORM_data1:
return int8_t(Value.uval);
case DW_FORM_sdata:
case DW_FORM_data8:
default:
return Value.sval;
}
}
Optional<ArrayRef<uint8_t>> DWARFFormValue::getAsBlock() const {
if (!isFormClass(FC_Block) && !isFormClass(FC_Exprloc) &&
Form != DW_FORM_data16)
return None;
return makeArrayRef(Value.data, Value.uval);
}
Optional<uint64_t> DWARFFormValue::getAsCStringOffset() const {
if (!isFormClass(FC_String) && Form == DW_FORM_string)
return None;
return Value.uval;
}
Optional<uint64_t> DWARFFormValue::getAsReferenceUVal() const {
if (!isFormClass(FC_Reference))
return None;
return Value.uval;
}
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