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//===-- PDBLocationToDWARFExpression.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 "PDBLocationToDWARFExpression.h"
#include "lldb/Core/Section.h"
#include "lldb/Core/StreamBuffer.h"
#include "lldb/Core/dwarf.h"
#include "lldb/Expression/DWARFExpression.h"
#include "lldb/Symbol/Variable.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/DebugInfo/PDB/IPDBSession.h"
#include "llvm/DebugInfo/PDB/PDBSymbolData.h"
#include "Plugins/SymbolFile/NativePDB/CodeViewRegisterMapping.h"
#include "Plugins/SymbolFile/NativePDB/PdbFPOProgramToDWARFExpression.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::npdb;
using namespace llvm::pdb;
static std::unique_ptr<IPDBFrameData>
GetCorrespondingFrameData(const IPDBSession &session,
const Variable::RangeList &ranges) {
auto enumFrameData = session.getFrameData();
if (!enumFrameData)
return nullptr;
std::unique_ptr<IPDBFrameData> found;
while (auto fd = enumFrameData->getNext()) {
Range<lldb::addr_t, lldb::addr_t> fdRange(fd->getVirtualAddress(),
fd->getLengthBlock());
for (size_t i = 0; i < ranges.GetSize(); i++) {
auto range = ranges.GetEntryAtIndex(i);
if (!range)
continue;
if (!range->DoesIntersect(fdRange))
continue;
found = std::move(fd);
break;
}
}
return found;
}
static bool EmitVFrameEvaluationDWARFExpression(
llvm::StringRef program, llvm::Triple::ArchType arch_type, Stream &stream) {
// VFrame value always stored in $TO pseudo-register
return TranslateFPOProgramToDWARFExpression(program, "$T0", arch_type,
stream);
}
DWARFExpression ConvertPDBLocationToDWARFExpression(
ModuleSP module, const PDBSymbolData &symbol,
const Variable::RangeList &ranges, bool &is_constant) {
is_constant = true;
if (!module)
return DWARFExpression();
const ArchSpec &architecture = module->GetArchitecture();
llvm::Triple::ArchType arch_type = architecture.GetMachine();
ByteOrder byte_order = architecture.GetByteOrder();
uint32_t address_size = architecture.GetAddressByteSize();
uint32_t byte_size = architecture.GetDataByteSize();
if (byte_order == eByteOrderInvalid || address_size == 0)
return DWARFExpression();
RegisterKind register_kind = eRegisterKindDWARF;
StreamBuffer<32> stream(Stream::eBinary, address_size, byte_order);
switch (symbol.getLocationType()) {
case PDB_LocType::Static:
case PDB_LocType::TLS: {
stream.PutHex8(DW_OP_addr);
SectionList *section_list = module->GetSectionList();
if (!section_list)
return DWARFExpression();
uint32_t section_id = symbol.getAddressSection();
auto section = section_list->FindSectionByID(section_id);
if (!section)
return DWARFExpression();
uint32_t offset = symbol.getAddressOffset();
stream.PutMaxHex64(section->GetFileAddress() + offset, address_size,
byte_order);
is_constant = false;
break;
}
case PDB_LocType::RegRel: {
uint32_t reg_num;
auto reg_id = symbol.getRegisterId();
if (reg_id == llvm::codeview::RegisterId::VFRAME) {
if (auto fd = GetCorrespondingFrameData(symbol.getSession(), ranges)) {
if (EmitVFrameEvaluationDWARFExpression(fd->getProgram(), arch_type,
stream)) {
int32_t offset = symbol.getOffset();
stream.PutHex8(DW_OP_consts);
stream.PutSLEB128(offset);
stream.PutHex8(DW_OP_plus);
register_kind = eRegisterKindLLDB;
is_constant = false;
break;
}
}
register_kind = eRegisterKindGeneric;
reg_num = LLDB_REGNUM_GENERIC_FP;
} else {
register_kind = eRegisterKindLLDB;
reg_num = GetLLDBRegisterNumber(arch_type, reg_id);
if (reg_num == LLDB_INVALID_REGNUM)
return DWARFExpression();
}
if (reg_num > 31) {
stream.PutHex8(DW_OP_bregx);
stream.PutULEB128(reg_num);
} else
stream.PutHex8(DW_OP_breg0 + reg_num);
int32_t offset = symbol.getOffset();
stream.PutSLEB128(offset);
is_constant = false;
break;
}
case PDB_LocType::Enregistered: {
register_kind = eRegisterKindLLDB;
uint32_t reg_num = GetLLDBRegisterNumber(arch_type, symbol.getRegisterId());
if (reg_num == LLDB_INVALID_REGNUM)
return DWARFExpression();
if (reg_num > 31) {
stream.PutHex8(DW_OP_regx);
stream.PutULEB128(reg_num);
} else
stream.PutHex8(DW_OP_reg0 + reg_num);
is_constant = false;
break;
}
case PDB_LocType::Constant: {
Variant value = symbol.getValue();
stream.PutRawBytes(&value.Value, sizeof(value.Value),
endian::InlHostByteOrder());
break;
}
default:
return DWARFExpression();
}
DataBufferSP buffer =
std::make_shared<DataBufferHeap>(stream.GetData(), stream.GetSize());
DataExtractor extractor(buffer, byte_order, address_size, byte_size);
DWARFExpression result(module, extractor, nullptr);
result.SetRegisterKind(register_kind);
return result;
}
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