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llvm-project/lldb/source/Expression/IRExecutionUnit.cpp

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//===-- IRExecutionUnit.cpp -----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/ExecutionEngine/ObjectCache.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DiagnosticHandler.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Disassembler.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/Section.h"
#include "lldb/Expression/IRExecutionUnit.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Symbol/SymbolFile.h"
#include "lldb/Symbol/SymbolVendor.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Language.h"
#include "lldb/Target/LanguageRuntime.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/LLDBAssert.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "lldb/../../source/Plugins/ObjectFile/JIT/ObjectFileJIT.h"
using namespace lldb_private;
IRExecutionUnit::IRExecutionUnit(std::unique_ptr<llvm::LLVMContext> &context_up,
std::unique_ptr<llvm::Module> &module_up,
ConstString &name,
const lldb::TargetSP &target_sp,
const SymbolContext &sym_ctx,
std::vector<std::string> &cpu_features)
: IRMemoryMap(target_sp), m_context_up(context_up.release()),
m_module_up(module_up.release()), m_module(m_module_up.get()),
m_cpu_features(cpu_features), m_name(name), m_sym_ctx(sym_ctx),
m_did_jit(false), m_function_load_addr(LLDB_INVALID_ADDRESS),
m_function_end_load_addr(LLDB_INVALID_ADDRESS),
m_reported_allocations(false) {}
lldb::addr_t IRExecutionUnit::WriteNow(const uint8_t *bytes, size_t size,
Status &error) {
const bool zero_memory = false;
lldb::addr_t allocation_process_addr =
Malloc(size, 8, lldb::ePermissionsWritable | lldb::ePermissionsReadable,
eAllocationPolicyMirror, zero_memory, error);
if (!error.Success())
return LLDB_INVALID_ADDRESS;
WriteMemory(allocation_process_addr, bytes, size, error);
if (!error.Success()) {
Status err;
Free(allocation_process_addr, err);
return LLDB_INVALID_ADDRESS;
}
if (Log *log = GetLog(LLDBLog::Expressions)) {
DataBufferHeap my_buffer(size, 0);
Status err;
ReadMemory(my_buffer.GetBytes(), allocation_process_addr, size, err);
if (err.Success()) {
DataExtractor my_extractor(my_buffer.GetBytes(), my_buffer.GetByteSize(),
lldb::eByteOrderBig, 8);
my_extractor.PutToLog(log, 0, my_buffer.GetByteSize(),
allocation_process_addr, 16,
DataExtractor::TypeUInt8);
}
}
return allocation_process_addr;
}
void IRExecutionUnit::FreeNow(lldb::addr_t allocation) {
if (allocation == LLDB_INVALID_ADDRESS)
return;
Status err;
Free(allocation, err);
}
Status IRExecutionUnit::DisassembleFunction(Stream &stream,
lldb::ProcessSP &process_wp) {
Log *log = GetLog(LLDBLog::Expressions);
ExecutionContext exe_ctx(process_wp);
Status ret;
ret.Clear();
lldb::addr_t func_local_addr = LLDB_INVALID_ADDRESS;
lldb::addr_t func_remote_addr = LLDB_INVALID_ADDRESS;
for (JittedFunction &function : m_jitted_functions) {
if (function.m_name == m_name) {
func_local_addr = function.m_local_addr;
func_remote_addr = function.m_remote_addr;
}
}
if (func_local_addr == LLDB_INVALID_ADDRESS) {
ret.SetErrorToGenericError();
ret.SetErrorStringWithFormat("Couldn't find function %s for disassembly",
m_name.AsCString());
return ret;
}
LLDB_LOGF(log,
"Found function, has local address 0x%" PRIx64
" and remote address 0x%" PRIx64,
(uint64_t)func_local_addr, (uint64_t)func_remote_addr);
std::pair<lldb::addr_t, lldb::addr_t> func_range;
func_range = GetRemoteRangeForLocal(func_local_addr);
if (func_range.first == 0 && func_range.second == 0) {
ret.SetErrorToGenericError();
ret.SetErrorStringWithFormat("Couldn't find code range for function %s",
m_name.AsCString());
return ret;
}
LLDB_LOGF(log, "Function's code range is [0x%" PRIx64 "+0x%" PRIx64 "]",
func_range.first, func_range.second);
Target *target = exe_ctx.GetTargetPtr();
if (!target) {
ret.SetErrorToGenericError();
ret.SetErrorString("Couldn't find the target");
return ret;
}
lldb::DataBufferSP buffer_sp(new DataBufferHeap(func_range.second, 0));
Process *process = exe_ctx.GetProcessPtr();
Status err;
process->ReadMemory(func_remote_addr, buffer_sp->GetBytes(),
buffer_sp->GetByteSize(), err);
if (!err.Success()) {
ret.SetErrorToGenericError();
ret.SetErrorStringWithFormat("Couldn't read from process: %s",
err.AsCString("unknown error"));
return ret;
}
ArchSpec arch(target->GetArchitecture());
const char *plugin_name = nullptr;
const char *flavor_string = nullptr;
lldb::DisassemblerSP disassembler_sp =
Disassembler::FindPlugin(arch, flavor_string, plugin_name);
if (!disassembler_sp) {
ret.SetErrorToGenericError();
ret.SetErrorStringWithFormat(
"Unable to find disassembler plug-in for %s architecture.",
arch.GetArchitectureName());
return ret;
}
if (!process) {
ret.SetErrorToGenericError();
ret.SetErrorString("Couldn't find the process");
return ret;
}
DataExtractor extractor(buffer_sp, process->GetByteOrder(),
target->GetArchitecture().GetAddressByteSize());
if (log) {
LLDB_LOGF(log, "Function data has contents:");
extractor.PutToLog(log, 0, extractor.GetByteSize(), func_remote_addr, 16,
DataExtractor::TypeUInt8);
}
disassembler_sp->DecodeInstructions(Address(func_remote_addr), extractor, 0,
UINT32_MAX, false, false);
InstructionList &instruction_list = disassembler_sp->GetInstructionList();
instruction_list.Dump(&stream, true, true, &exe_ctx);
return ret;
}
namespace {
struct IRExecDiagnosticHandler : public llvm::DiagnosticHandler {
Status *err;
IRExecDiagnosticHandler(Status *err) : err(err) {}
bool handleDiagnostics(const llvm::DiagnosticInfo &DI) override {
if (DI.getKind() == llvm::DK_SrcMgr) {
const auto &DISM = llvm::cast<llvm::DiagnosticInfoSrcMgr>(DI);
if (err && err->Success()) {
err->SetErrorToGenericError();
err->SetErrorStringWithFormat(
"Inline assembly error: %s",
DISM.getSMDiag().getMessage().str().c_str());
}
return true;
}
return false;
}
};
} // namespace
void IRExecutionUnit::ReportSymbolLookupError(ConstString name) {
m_failed_lookups.push_back(name);
}
void IRExecutionUnit::GetRunnableInfo(Status &error, lldb::addr_t &func_addr,
lldb::addr_t &func_end) {
lldb::ProcessSP process_sp(GetProcessWP().lock());
static std::recursive_mutex s_runnable_info_mutex;
func_addr = LLDB_INVALID_ADDRESS;
func_end = LLDB_INVALID_ADDRESS;
if (!process_sp) {
error.SetErrorToGenericError();
error.SetErrorString("Couldn't write the JIT compiled code into the "
"process because the process is invalid");
return;
}
if (m_did_jit) {
func_addr = m_function_load_addr;
func_end = m_function_end_load_addr;
return;
};
std::lock_guard<std::recursive_mutex> guard(s_runnable_info_mutex);
m_did_jit = true;
Log *log = GetLog(LLDBLog::Expressions);
std::string error_string;
if (log) {
std::string s;
llvm::raw_string_ostream oss(s);
m_module->print(oss, nullptr);
oss.flush();
LLDB_LOGF(log, "Module being sent to JIT: \n%s", s.c_str());
}
m_module_up->getContext().setDiagnosticHandler(
std::make_unique<IRExecDiagnosticHandler>(&error));
llvm::EngineBuilder builder(std::move(m_module_up));
llvm::Triple triple(m_module->getTargetTriple());
builder.setEngineKind(llvm::EngineKind::JIT)
.setErrorStr(&error_string)
.setRelocationModel(triple.isOSBinFormatMachO() ? llvm::Reloc::PIC_
: llvm::Reloc::Static)
.setMCJITMemoryManager(std::make_unique<MemoryManager>(*this))
.setOptLevel(llvm::CodeGenOpt::Less);
llvm::StringRef mArch;
llvm::StringRef mCPU;
llvm::SmallVector<std::string, 0> mAttrs;
for (std::string &feature : m_cpu_features)
mAttrs.push_back(feature);
llvm::TargetMachine *target_machine =
builder.selectTarget(triple, mArch, mCPU, mAttrs);
m_execution_engine_up.reset(builder.create(target_machine));
if (!m_execution_engine_up) {
error.SetErrorToGenericError();
error.SetErrorStringWithFormat("Couldn't JIT the function: %s",
error_string.c_str());
return;
}
m_strip_underscore =
(m_execution_engine_up->getDataLayout().getGlobalPrefix() == '_');
class ObjectDumper : public llvm::ObjectCache {
public:
ObjectDumper(FileSpec output_dir) : m_out_dir(output_dir) {}
void notifyObjectCompiled(const llvm::Module *module,
llvm::MemoryBufferRef object) override {
int fd = 0;
llvm::SmallVector<char, 256> result_path;
std::string object_name_model =
"jit-object-" + module->getModuleIdentifier() + "-%%%.o";
FileSpec model_spec
= m_out_dir.CopyByAppendingPathComponent(object_name_model);
std::string model_path = model_spec.GetPath();
std::error_code result
= llvm::sys::fs::createUniqueFile(model_path, fd, result_path);
if (!result) {
llvm::raw_fd_ostream fds(fd, true);
fds.write(object.getBufferStart(), object.getBufferSize());
}
}
std::unique_ptr<llvm::MemoryBuffer>
getObject(const llvm::Module *module) override {
// Return nothing - we're just abusing the object-cache mechanism to dump
// objects.
return nullptr;
}
private:
FileSpec m_out_dir;
};
FileSpec save_objects_dir = process_sp->GetTarget().GetSaveJITObjectsDir();
if (save_objects_dir) {
m_object_cache_up = std::make_unique<ObjectDumper>(save_objects_dir);
m_execution_engine_up->setObjectCache(m_object_cache_up.get());
}
// Make sure we see all sections, including ones that don't have
// relocations...
m_execution_engine_up->setProcessAllSections(true);
m_execution_engine_up->DisableLazyCompilation();
for (llvm::Function &function : *m_module) {
if (function.isDeclaration() || function.hasPrivateLinkage())
continue;
const bool external = !function.hasLocalLinkage();
void *fun_ptr = m_execution_engine_up->getPointerToFunction(&function);
if (!error.Success()) {
// We got an error through our callback!
return;
}
if (!fun_ptr) {
error.SetErrorToGenericError();
error.SetErrorStringWithFormat(
"'%s' was in the JITted module but wasn't lowered",
function.getName().str().c_str());
return;
}
m_jitted_functions.push_back(JittedFunction(
function.getName().str().c_str(), external, reinterpret_cast<uintptr_t>(fun_ptr)));
}
CommitAllocations(process_sp);
ReportAllocations(*m_execution_engine_up);
// We have to do this after calling ReportAllocations because for the MCJIT,
// getGlobalValueAddress will cause the JIT to perform all relocations. That
// can only be done once, and has to happen after we do the remapping from
// local -> remote. That means we don't know the local address of the
// Variables, but we don't need that for anything, so that's okay.
std::function<void(llvm::GlobalValue &)> RegisterOneValue = [this](
llvm::GlobalValue &val) {
if (val.hasExternalLinkage() && !val.isDeclaration()) {
uint64_t var_ptr_addr =
m_execution_engine_up->getGlobalValueAddress(val.getName().str());
lldb::addr_t remote_addr = GetRemoteAddressForLocal(var_ptr_addr);
// This is a really unfortunae API that sometimes returns local addresses
// and sometimes returns remote addresses, based on whether the variable
// was relocated during ReportAllocations or not.
if (remote_addr == LLDB_INVALID_ADDRESS) {
remote_addr = var_ptr_addr;
}
if (var_ptr_addr != 0)
m_jitted_global_variables.push_back(JittedGlobalVariable(
val.getName().str().c_str(), LLDB_INVALID_ADDRESS, remote_addr));
}
};
for (llvm::GlobalVariable &global_var : m_module->getGlobalList()) {
RegisterOneValue(global_var);
}
for (llvm::GlobalAlias &global_alias : m_module->getAliasList()) {
RegisterOneValue(global_alias);
}
WriteData(process_sp);
if (m_failed_lookups.size()) {
StreamString ss;
ss.PutCString("Couldn't lookup symbols:\n");
bool emitNewLine = false;
for (ConstString failed_lookup : m_failed_lookups) {
if (emitNewLine)
ss.PutCString("\n");
emitNewLine = true;
ss.PutCString(" ");
ss.PutCString(Mangled(failed_lookup).GetDemangledName().GetStringRef());
}
m_failed_lookups.clear();
error.SetErrorString(ss.GetString());
return;
}
m_function_load_addr = LLDB_INVALID_ADDRESS;
m_function_end_load_addr = LLDB_INVALID_ADDRESS;
for (JittedFunction &jitted_function : m_jitted_functions) {
jitted_function.m_remote_addr =
GetRemoteAddressForLocal(jitted_function.m_local_addr);
if (!m_name.IsEmpty() && jitted_function.m_name == m_name) {
AddrRange func_range =
GetRemoteRangeForLocal(jitted_function.m_local_addr);
m_function_end_load_addr = func_range.first + func_range.second;
m_function_load_addr = jitted_function.m_remote_addr;
}
}
if (log) {
LLDB_LOGF(log, "Code can be run in the target.");
StreamString disassembly_stream;
Status err = DisassembleFunction(disassembly_stream, process_sp);
if (!err.Success()) {
LLDB_LOGF(log, "Couldn't disassemble function : %s",
err.AsCString("unknown error"));
} else {
LLDB_LOGF(log, "Function disassembly:\n%s", disassembly_stream.GetData());
}
LLDB_LOGF(log, "Sections: ");
for (AllocationRecord &record : m_records) {
if (record.m_process_address != LLDB_INVALID_ADDRESS) {
record.dump(log);
DataBufferHeap my_buffer(record.m_size, 0);
Status err;
ReadMemory(my_buffer.GetBytes(), record.m_process_address,
record.m_size, err);
if (err.Success()) {
DataExtractor my_extractor(my_buffer.GetBytes(),
my_buffer.GetByteSize(),
lldb::eByteOrderBig, 8);
my_extractor.PutToLog(log, 0, my_buffer.GetByteSize(),
record.m_process_address, 16,
DataExtractor::TypeUInt8);
}
} else {
record.dump(log);
DataExtractor my_extractor((const void *)record.m_host_address,
record.m_size, lldb::eByteOrderBig, 8);
my_extractor.PutToLog(log, 0, record.m_size, record.m_host_address, 16,
DataExtractor::TypeUInt8);
}
}
}
func_addr = m_function_load_addr;
func_end = m_function_end_load_addr;
}
IRExecutionUnit::~IRExecutionUnit() {
m_module_up.reset();
m_execution_engine_up.reset();
m_context_up.reset();
}
IRExecutionUnit::MemoryManager::MemoryManager(IRExecutionUnit &parent)
: m_default_mm_up(new llvm::SectionMemoryManager()), m_parent(parent) {}
IRExecutionUnit::MemoryManager::~MemoryManager() = default;
lldb::SectionType IRExecutionUnit::GetSectionTypeFromSectionName(
const llvm::StringRef &name, IRExecutionUnit::AllocationKind alloc_kind) {
lldb::SectionType sect_type = lldb::eSectionTypeCode;
switch (alloc_kind) {
case AllocationKind::Stub:
sect_type = lldb::eSectionTypeCode;
break;
case AllocationKind::Code:
sect_type = lldb::eSectionTypeCode;
break;
case AllocationKind::Data:
sect_type = lldb::eSectionTypeData;
break;
case AllocationKind::Global:
sect_type = lldb::eSectionTypeData;
break;
case AllocationKind::Bytes:
sect_type = lldb::eSectionTypeOther;
break;
}
if (!name.empty()) {
if (name.equals("__text") || name.equals(".text"))
sect_type = lldb::eSectionTypeCode;
else if (name.equals("__data") || name.equals(".data"))
sect_type = lldb::eSectionTypeCode;
else if (name.startswith("__debug_") || name.startswith(".debug_")) {
const uint32_t name_idx = name[0] == '_' ? 8 : 7;
llvm::StringRef dwarf_name(name.substr(name_idx));
switch (dwarf_name[0]) {
case 'a':
if (dwarf_name.equals("abbrev"))
sect_type = lldb::eSectionTypeDWARFDebugAbbrev;
else if (dwarf_name.equals("aranges"))
sect_type = lldb::eSectionTypeDWARFDebugAranges;
else if (dwarf_name.equals("addr"))
sect_type = lldb::eSectionTypeDWARFDebugAddr;
break;
case 'f':
if (dwarf_name.equals("frame"))
sect_type = lldb::eSectionTypeDWARFDebugFrame;
break;
case 'i':
if (dwarf_name.equals("info"))
sect_type = lldb::eSectionTypeDWARFDebugInfo;
break;
case 'l':
if (dwarf_name.equals("line"))
sect_type = lldb::eSectionTypeDWARFDebugLine;
else if (dwarf_name.equals("loc"))
sect_type = lldb::eSectionTypeDWARFDebugLoc;
else if (dwarf_name.equals("loclists"))
sect_type = lldb::eSectionTypeDWARFDebugLocLists;
break;
case 'm':
if (dwarf_name.equals("macinfo"))
sect_type = lldb::eSectionTypeDWARFDebugMacInfo;
break;
case 'p':
if (dwarf_name.equals("pubnames"))
sect_type = lldb::eSectionTypeDWARFDebugPubNames;
else if (dwarf_name.equals("pubtypes"))
sect_type = lldb::eSectionTypeDWARFDebugPubTypes;
break;
case 's':
if (dwarf_name.equals("str"))
sect_type = lldb::eSectionTypeDWARFDebugStr;
else if (dwarf_name.equals("str_offsets"))
sect_type = lldb::eSectionTypeDWARFDebugStrOffsets;
break;
case 'r':
if (dwarf_name.equals("ranges"))
sect_type = lldb::eSectionTypeDWARFDebugRanges;
break;
default:
break;
}
} else if (name.startswith("__apple_") || name.startswith(".apple_"))
sect_type = lldb::eSectionTypeInvalid;
else if (name.equals("__objc_imageinfo"))
sect_type = lldb::eSectionTypeOther;
}
return sect_type;
}
uint8_t *IRExecutionUnit::MemoryManager::allocateCodeSection(
uintptr_t Size, unsigned Alignment, unsigned SectionID,
llvm::StringRef SectionName) {
Log *log = GetLog(LLDBLog::Expressions);
uint8_t *return_value = m_default_mm_up->allocateCodeSection(
Size, Alignment, SectionID, SectionName);
m_parent.m_records.push_back(AllocationRecord(
(uintptr_t)return_value,
lldb::ePermissionsReadable | lldb::ePermissionsExecutable,
GetSectionTypeFromSectionName(SectionName, AllocationKind::Code), Size,
Alignment, SectionID, SectionName.str().c_str()));
LLDB_LOGF(log,
"IRExecutionUnit::allocateCodeSection(Size=0x%" PRIx64
", Alignment=%u, SectionID=%u) = %p",
(uint64_t)Size, Alignment, SectionID, (void *)return_value);
if (m_parent.m_reported_allocations) {
Status err;
lldb::ProcessSP process_sp =
m_parent.GetBestExecutionContextScope()->CalculateProcess();
m_parent.CommitOneAllocation(process_sp, err, m_parent.m_records.back());
}
return return_value;
}
uint8_t *IRExecutionUnit::MemoryManager::allocateDataSection(
uintptr_t Size, unsigned Alignment, unsigned SectionID,
llvm::StringRef SectionName, bool IsReadOnly) {
Log *log = GetLog(LLDBLog::Expressions);
uint8_t *return_value = m_default_mm_up->allocateDataSection(
Size, Alignment, SectionID, SectionName, IsReadOnly);
uint32_t permissions = lldb::ePermissionsReadable;
if (!IsReadOnly)
permissions |= lldb::ePermissionsWritable;
m_parent.m_records.push_back(AllocationRecord(
(uintptr_t)return_value, permissions,
GetSectionTypeFromSectionName(SectionName, AllocationKind::Data), Size,
Alignment, SectionID, SectionName.str().c_str()));
LLDB_LOGF(log,
"IRExecutionUnit::allocateDataSection(Size=0x%" PRIx64
", Alignment=%u, SectionID=%u) = %p",
(uint64_t)Size, Alignment, SectionID, (void *)return_value);
if (m_parent.m_reported_allocations) {
Status err;
lldb::ProcessSP process_sp =
m_parent.GetBestExecutionContextScope()->CalculateProcess();
m_parent.CommitOneAllocation(process_sp, err, m_parent.m_records.back());
}
return return_value;
}
void IRExecutionUnit::CollectCandidateCNames(std::vector<ConstString> &C_names,
ConstString name) {
if (m_strip_underscore && name.AsCString()[0] == '_')
C_names.insert(C_names.begin(), ConstString(&name.AsCString()[1]));
C_names.push_back(name);
}
void IRExecutionUnit::CollectCandidateCPlusPlusNames(
std::vector<ConstString> &CPP_names,
const std::vector<ConstString> &C_names, const SymbolContext &sc) {
if (auto *cpp_lang = Language::FindPlugin(lldb::eLanguageTypeC_plus_plus)) {
for (const ConstString &name : C_names) {
Mangled mangled(name);
if (cpp_lang->SymbolNameFitsToLanguage(mangled)) {
if (ConstString best_alternate =
cpp_lang->FindBestAlternateFunctionMangledName(mangled, sc)) {
CPP_names.push_back(best_alternate);
}
}
std::vector<ConstString> alternates =
cpp_lang->GenerateAlternateFunctionManglings(name);
CPP_names.insert(CPP_names.end(), alternates.begin(), alternates.end());
// As a last-ditch fallback, try the base name for C++ names. It's
// terrible, but the DWARF doesn't always encode "extern C" correctly.
ConstString basename =
cpp_lang->GetDemangledFunctionNameWithoutArguments(mangled);
CPP_names.push_back(basename);
}
}
}
class LoadAddressResolver {
public:
LoadAddressResolver(Target *target, bool &symbol_was_missing_weak)
: m_target(target), m_symbol_was_missing_weak(symbol_was_missing_weak) {}
llvm::Optional<lldb::addr_t> Resolve(SymbolContextList &sc_list) {
if (sc_list.IsEmpty())
return llvm::None;
lldb::addr_t load_address = LLDB_INVALID_ADDRESS;
// Missing_weak_symbol will be true only if we found only weak undefined
// references to this symbol.
m_symbol_was_missing_weak = true;
for (auto candidate_sc : sc_list.SymbolContexts()) {
// Only symbols can be weak undefined.
if (!candidate_sc.symbol ||
candidate_sc.symbol->GetType() != lldb::eSymbolTypeUndefined ||
!candidate_sc.symbol->IsWeak())
m_symbol_was_missing_weak = false;
// First try the symbol.
if (candidate_sc.symbol) {
load_address = candidate_sc.symbol->ResolveCallableAddress(*m_target);
if (load_address == LLDB_INVALID_ADDRESS) {
Address addr = candidate_sc.symbol->GetAddress();
load_address = m_target->GetProcessSP()
? addr.GetLoadAddress(m_target)
: addr.GetFileAddress();
}
}
// If that didn't work, try the function.
if (load_address == LLDB_INVALID_ADDRESS && candidate_sc.function) {
Address addr =
candidate_sc.function->GetAddressRange().GetBaseAddress();
load_address = m_target->GetProcessSP() ? addr.GetLoadAddress(m_target)
: addr.GetFileAddress();
}
// We found a load address.
if (load_address != LLDB_INVALID_ADDRESS) {
// If the load address is external, we're done.
const bool is_external =
(candidate_sc.function) ||
(candidate_sc.symbol && candidate_sc.symbol->IsExternal());
if (is_external)
return load_address;
// Otherwise, remember the best internal load address.
if (m_best_internal_load_address == LLDB_INVALID_ADDRESS)
m_best_internal_load_address = load_address;
}
}
// You test the address of a weak symbol against NULL to see if it is
// present. So we should return 0 for a missing weak symbol.
if (m_symbol_was_missing_weak)
return 0;
return llvm::None;
}
lldb::addr_t GetBestInternalLoadAddress() const {
return m_best_internal_load_address;
}
private:
Target *m_target;
bool &m_symbol_was_missing_weak;
lldb::addr_t m_best_internal_load_address = LLDB_INVALID_ADDRESS;
};
lldb::addr_t
IRExecutionUnit::FindInSymbols(const std::vector<ConstString> &names,
const lldb_private::SymbolContext &sc,
bool &symbol_was_missing_weak) {
symbol_was_missing_weak = false;
Target *target = sc.target_sp.get();
if (!target) {
// We shouldn't be doing any symbol lookup at all without a target.
return LLDB_INVALID_ADDRESS;
}
LoadAddressResolver resolver(target, symbol_was_missing_weak);
ModuleFunctionSearchOptions function_options;
function_options.include_symbols = true;
function_options.include_inlines = false;
for (const ConstString &name : names) {
if (sc.module_sp) {
SymbolContextList sc_list;
sc.module_sp->FindFunctions(name, CompilerDeclContext(),
lldb::eFunctionNameTypeFull, function_options,
sc_list);
if (auto load_addr = resolver.Resolve(sc_list))
return *load_addr;
}
if (sc.target_sp) {
SymbolContextList sc_list;
sc.target_sp->GetImages().FindFunctions(name, lldb::eFunctionNameTypeFull,
function_options, sc_list);
if (auto load_addr = resolver.Resolve(sc_list))
return *load_addr;
}
if (sc.target_sp) {
SymbolContextList sc_list;
sc.target_sp->GetImages().FindSymbolsWithNameAndType(
name, lldb::eSymbolTypeAny, sc_list);
if (auto load_addr = resolver.Resolve(sc_list))
return *load_addr;
}
lldb::addr_t best_internal_load_address =
resolver.GetBestInternalLoadAddress();
if (best_internal_load_address != LLDB_INVALID_ADDRESS)
return best_internal_load_address;
}
return LLDB_INVALID_ADDRESS;
}
lldb::addr_t
IRExecutionUnit::FindInRuntimes(const std::vector<ConstString> &names,
const lldb_private::SymbolContext &sc) {
lldb::TargetSP target_sp = sc.target_sp;
if (!target_sp) {
return LLDB_INVALID_ADDRESS;
}
lldb::ProcessSP process_sp = sc.target_sp->GetProcessSP();
if (!process_sp) {
return LLDB_INVALID_ADDRESS;
}
for (const ConstString &name : names) {
for (LanguageRuntime *runtime : process_sp->GetLanguageRuntimes()) {
lldb::addr_t symbol_load_addr = runtime->LookupRuntimeSymbol(name);
if (symbol_load_addr != LLDB_INVALID_ADDRESS)
return symbol_load_addr;
}
}
return LLDB_INVALID_ADDRESS;
}
lldb::addr_t IRExecutionUnit::FindInUserDefinedSymbols(
const std::vector<ConstString> &names,
const lldb_private::SymbolContext &sc) {
lldb::TargetSP target_sp = sc.target_sp;
for (const ConstString &name : names) {
lldb::addr_t symbol_load_addr = target_sp->GetPersistentSymbol(name);
if (symbol_load_addr != LLDB_INVALID_ADDRESS)
return symbol_load_addr;
}
return LLDB_INVALID_ADDRESS;
}
lldb::addr_t IRExecutionUnit::FindSymbol(lldb_private::ConstString name,
bool &missing_weak) {
std::vector<ConstString> candidate_C_names;
std::vector<ConstString> candidate_CPlusPlus_names;
CollectCandidateCNames(candidate_C_names, name);
lldb::addr_t ret = FindInSymbols(candidate_C_names, m_sym_ctx, missing_weak);
if (ret != LLDB_INVALID_ADDRESS)
return ret;
// If we find the symbol in runtimes or user defined symbols it can't be
// a missing weak symbol.
missing_weak = false;
ret = FindInRuntimes(candidate_C_names, m_sym_ctx);
if (ret != LLDB_INVALID_ADDRESS)
return ret;
ret = FindInUserDefinedSymbols(candidate_C_names, m_sym_ctx);
if (ret != LLDB_INVALID_ADDRESS)
return ret;
CollectCandidateCPlusPlusNames(candidate_CPlusPlus_names, candidate_C_names,
m_sym_ctx);
ret = FindInSymbols(candidate_CPlusPlus_names, m_sym_ctx, missing_weak);
return ret;
}
void IRExecutionUnit::GetStaticInitializers(
std::vector<lldb::addr_t> &static_initializers) {
Log *log = GetLog(LLDBLog::Expressions);
llvm::GlobalVariable *global_ctors =
m_module->getNamedGlobal("llvm.global_ctors");
if (!global_ctors) {
LLDB_LOG(log, "Couldn't find llvm.global_ctors.");
return;
}
auto *ctor_array =
llvm::dyn_cast<llvm::ConstantArray>(global_ctors->getInitializer());
if (!ctor_array) {
LLDB_LOG(log, "llvm.global_ctors not a ConstantArray.");
return;
}
for (llvm::Use &ctor_use : ctor_array->operands()) {
auto *ctor_struct = llvm::dyn_cast<llvm::ConstantStruct>(ctor_use);
if (!ctor_struct)
continue;
// this is standardized
lldbassert(ctor_struct->getNumOperands() == 3);
auto *ctor_function =
llvm::dyn_cast<llvm::Function>(ctor_struct->getOperand(1));
if (!ctor_function) {
LLDB_LOG(log, "global_ctor doesn't contain an llvm::Function");
continue;
}
ConstString ctor_function_name(ctor_function->getName().str());
LLDB_LOG(log, "Looking for callable jitted function with name {0}.",
ctor_function_name);
for (JittedFunction &jitted_function : m_jitted_functions) {
if (ctor_function_name != jitted_function.m_name)
continue;
if (jitted_function.m_remote_addr == LLDB_INVALID_ADDRESS) {
LLDB_LOG(log, "Found jitted function with invalid address.");
continue;
}
static_initializers.push_back(jitted_function.m_remote_addr);
LLDB_LOG(log, "Calling function at address {0:x}.",
jitted_function.m_remote_addr);
break;
}
}
}
llvm::JITSymbol
IRExecutionUnit::MemoryManager::findSymbol(const std::string &Name) {
bool missing_weak = false;
uint64_t addr = GetSymbolAddressAndPresence(Name, missing_weak);
// This is a weak symbol:
if (missing_weak)
return llvm::JITSymbol(addr,
llvm::JITSymbolFlags::Exported | llvm::JITSymbolFlags::Weak);
else
return llvm::JITSymbol(addr, llvm::JITSymbolFlags::Exported);
}
uint64_t
IRExecutionUnit::MemoryManager::getSymbolAddress(const std::string &Name) {
bool missing_weak = false;
return GetSymbolAddressAndPresence(Name, missing_weak);
}
uint64_t
IRExecutionUnit::MemoryManager::GetSymbolAddressAndPresence(
const std::string &Name, bool &missing_weak) {
Log *log = GetLog(LLDBLog::Expressions);
ConstString name_cs(Name.c_str());
lldb::addr_t ret = m_parent.FindSymbol(name_cs, missing_weak);
if (ret == LLDB_INVALID_ADDRESS) {
LLDB_LOGF(log,
"IRExecutionUnit::getSymbolAddress(Name=\"%s\") = <not found>",
Name.c_str());
m_parent.ReportSymbolLookupError(name_cs);
return 0;
} else {
LLDB_LOGF(log, "IRExecutionUnit::getSymbolAddress(Name=\"%s\") = %" PRIx64,
Name.c_str(), ret);
return ret;
}
}
void *IRExecutionUnit::MemoryManager::getPointerToNamedFunction(
const std::string &Name, bool AbortOnFailure) {
return (void *)getSymbolAddress(Name);
}
lldb::addr_t
IRExecutionUnit::GetRemoteAddressForLocal(lldb::addr_t local_address) {
Log *log = GetLog(LLDBLog::Expressions);
for (AllocationRecord &record : m_records) {
if (local_address >= record.m_host_address &&
local_address < record.m_host_address + record.m_size) {
if (record.m_process_address == LLDB_INVALID_ADDRESS)
return LLDB_INVALID_ADDRESS;
lldb::addr_t ret =
record.m_process_address + (local_address - record.m_host_address);
LLDB_LOGF(log,
"IRExecutionUnit::GetRemoteAddressForLocal() found 0x%" PRIx64
" in [0x%" PRIx64 "..0x%" PRIx64 "], and returned 0x%" PRIx64
" from [0x%" PRIx64 "..0x%" PRIx64 "].",
local_address, (uint64_t)record.m_host_address,
(uint64_t)record.m_host_address + (uint64_t)record.m_size, ret,
record.m_process_address,
record.m_process_address + record.m_size);
return ret;
}
}
return LLDB_INVALID_ADDRESS;
}
IRExecutionUnit::AddrRange
IRExecutionUnit::GetRemoteRangeForLocal(lldb::addr_t local_address) {
for (AllocationRecord &record : m_records) {
if (local_address >= record.m_host_address &&
local_address < record.m_host_address + record.m_size) {
if (record.m_process_address == LLDB_INVALID_ADDRESS)
return AddrRange(0, 0);
return AddrRange(record.m_process_address, record.m_size);
}
}
return AddrRange(0, 0);
}
bool IRExecutionUnit::CommitOneAllocation(lldb::ProcessSP &process_sp,
Status &error,
AllocationRecord &record) {
if (record.m_process_address != LLDB_INVALID_ADDRESS) {
return true;
}
switch (record.m_sect_type) {
case lldb::eSectionTypeInvalid:
case lldb::eSectionTypeDWARFDebugAbbrev:
case lldb::eSectionTypeDWARFDebugAddr:
case lldb::eSectionTypeDWARFDebugAranges:
case lldb::eSectionTypeDWARFDebugCuIndex:
case lldb::eSectionTypeDWARFDebugFrame:
case lldb::eSectionTypeDWARFDebugInfo:
case lldb::eSectionTypeDWARFDebugLine:
case lldb::eSectionTypeDWARFDebugLoc:
case lldb::eSectionTypeDWARFDebugLocLists:
case lldb::eSectionTypeDWARFDebugMacInfo:
case lldb::eSectionTypeDWARFDebugPubNames:
case lldb::eSectionTypeDWARFDebugPubTypes:
case lldb::eSectionTypeDWARFDebugRanges:
case lldb::eSectionTypeDWARFDebugStr:
case lldb::eSectionTypeDWARFDebugStrOffsets:
case lldb::eSectionTypeDWARFAppleNames:
case lldb::eSectionTypeDWARFAppleTypes:
case lldb::eSectionTypeDWARFAppleNamespaces:
case lldb::eSectionTypeDWARFAppleObjC:
case lldb::eSectionTypeDWARFGNUDebugAltLink:
error.Clear();
break;
default:
const bool zero_memory = false;
record.m_process_address =
Malloc(record.m_size, record.m_alignment, record.m_permissions,
eAllocationPolicyProcessOnly, zero_memory, error);
break;
}
return error.Success();
}
bool IRExecutionUnit::CommitAllocations(lldb::ProcessSP &process_sp) {
bool ret = true;
lldb_private::Status err;
for (AllocationRecord &record : m_records) {
ret = CommitOneAllocation(process_sp, err, record);
if (!ret) {
break;
}
}
if (!ret) {
for (AllocationRecord &record : m_records) {
if (record.m_process_address != LLDB_INVALID_ADDRESS) {
Free(record.m_process_address, err);
record.m_process_address = LLDB_INVALID_ADDRESS;
}
}
}
return ret;
}
void IRExecutionUnit::ReportAllocations(llvm::ExecutionEngine &engine) {
m_reported_allocations = true;
for (AllocationRecord &record : m_records) {
if (record.m_process_address == LLDB_INVALID_ADDRESS)
continue;
if (record.m_section_id == eSectionIDInvalid)
continue;
engine.mapSectionAddress((void *)record.m_host_address,
record.m_process_address);
}
// Trigger re-application of relocations.
engine.finalizeObject();
}
bool IRExecutionUnit::WriteData(lldb::ProcessSP &process_sp) {
bool wrote_something = false;
for (AllocationRecord &record : m_records) {
if (record.m_process_address != LLDB_INVALID_ADDRESS) {
lldb_private::Status err;
WriteMemory(record.m_process_address, (uint8_t *)record.m_host_address,
record.m_size, err);
if (err.Success())
wrote_something = true;
}
}
return wrote_something;
}
void IRExecutionUnit::AllocationRecord::dump(Log *log) {
if (!log)
return;
LLDB_LOGF(log,
"[0x%llx+0x%llx]->0x%llx (alignment %d, section ID %d, name %s)",
(unsigned long long)m_host_address, (unsigned long long)m_size,
(unsigned long long)m_process_address, (unsigned)m_alignment,
(unsigned)m_section_id, m_name.c_str());
}
lldb::ByteOrder IRExecutionUnit::GetByteOrder() const {
ExecutionContext exe_ctx(GetBestExecutionContextScope());
return exe_ctx.GetByteOrder();
}
uint32_t IRExecutionUnit::GetAddressByteSize() const {
ExecutionContext exe_ctx(GetBestExecutionContextScope());
return exe_ctx.GetAddressByteSize();
}
void IRExecutionUnit::PopulateSymtab(lldb_private::ObjectFile *obj_file,
lldb_private::Symtab &symtab) {
// No symbols yet...
}
void IRExecutionUnit::PopulateSectionList(
lldb_private::ObjectFile *obj_file,
lldb_private::SectionList &section_list) {
for (AllocationRecord &record : m_records) {
if (record.m_size > 0) {
lldb::SectionSP section_sp(new lldb_private::Section(
obj_file->GetModule(), obj_file, record.m_section_id,
ConstString(record.m_name), record.m_sect_type,
record.m_process_address, record.m_size,
record.m_host_address, // file_offset (which is the host address for
// the data)
record.m_size, // file_size
0,
record.m_permissions)); // flags
section_list.AddSection(section_sp);
}
}
}
ArchSpec IRExecutionUnit::GetArchitecture() {
ExecutionContext exe_ctx(GetBestExecutionContextScope());
if(Target *target = exe_ctx.GetTargetPtr())
return target->GetArchitecture();
return ArchSpec();
}
lldb::ModuleSP IRExecutionUnit::GetJITModule() {
ExecutionContext exe_ctx(GetBestExecutionContextScope());
Target *target = exe_ctx.GetTargetPtr();
if (!target)
return nullptr;
auto Delegate = std::static_pointer_cast<lldb_private::ObjectFileJITDelegate>(
shared_from_this());
lldb::ModuleSP jit_module_sp =
lldb_private::Module::CreateModuleFromObjectFile<ObjectFileJIT>(Delegate);
if (!jit_module_sp)
return nullptr;
bool changed = false;
jit_module_sp->SetLoadAddress(*target, 0, true, changed);
return jit_module_sp;
}
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