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| //===-- DWARFLocationExpression.cpp -----------------------------*- C++ -*-===//
//
// 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 "DWARFLocationExpression.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/Section.h"
#include "lldb/Core/StreamBuffer.h"
#include "lldb/Expression/DWARFExpression.h"
#include "lldb/Utility/ArchSpec.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/DebugInfo/CodeView/TypeDeserializer.h"
#include "llvm/DebugInfo/CodeView/TypeIndex.h"
#include "llvm/DebugInfo/PDB/Native/TpiStream.h"
#include "llvm/Support/Endian.h"
#include "PdbUtil.h"
#include "CodeViewRegisterMapping.h"
#include "PdbFPOProgramToDWARFExpression.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::npdb;
using namespace llvm::codeview;
using namespace llvm::pdb;
uint32_t GetGenericRegisterNumber(llvm::codeview::RegisterId register_id) {
if (register_id == llvm::codeview::RegisterId::VFRAME)
return LLDB_REGNUM_GENERIC_FP;
return LLDB_INVALID_REGNUM;
}
static uint32_t GetRegisterNumber(llvm::Triple::ArchType arch_type,
llvm::codeview::RegisterId register_id,
RegisterKind ®ister_kind) {
register_kind = eRegisterKindLLDB;
uint32_t reg_num = GetLLDBRegisterNumber(arch_type, register_id);
if (reg_num != LLDB_INVALID_REGNUM)
return reg_num;
register_kind = eRegisterKindGeneric;
return GetGenericRegisterNumber(register_id);
}
static bool IsSimpleTypeSignedInteger(SimpleTypeKind kind) {
switch (kind) {
case SimpleTypeKind::Int128:
case SimpleTypeKind::Int64:
case SimpleTypeKind::Int64Quad:
case SimpleTypeKind::Int32:
case SimpleTypeKind::Int32Long:
case SimpleTypeKind::Int16:
case SimpleTypeKind::Int16Short:
case SimpleTypeKind::Float128:
case SimpleTypeKind::Float80:
case SimpleTypeKind::Float64:
case SimpleTypeKind::Float32:
case SimpleTypeKind::Float16:
case SimpleTypeKind::NarrowCharacter:
case SimpleTypeKind::SignedCharacter:
case SimpleTypeKind::SByte:
return true;
default:
return false;
}
}
static std::pair<size_t, bool> GetIntegralTypeInfo(TypeIndex ti,
TpiStream &tpi) {
if (ti.isSimple()) {
SimpleTypeKind stk = ti.getSimpleKind();
return {GetTypeSizeForSimpleKind(stk), IsSimpleTypeSignedInteger(stk)};
}
CVType cvt = tpi.getType(ti);
switch (cvt.kind()) {
case LF_MODIFIER: {
ModifierRecord mfr;
llvm::cantFail(TypeDeserializer::deserializeAs<ModifierRecord>(cvt, mfr));
return GetIntegralTypeInfo(mfr.ModifiedType, tpi);
}
case LF_POINTER: {
PointerRecord pr;
llvm::cantFail(TypeDeserializer::deserializeAs<PointerRecord>(cvt, pr));
return GetIntegralTypeInfo(pr.ReferentType, tpi);
}
case LF_ENUM: {
EnumRecord er;
llvm::cantFail(TypeDeserializer::deserializeAs<EnumRecord>(cvt, er));
return GetIntegralTypeInfo(er.UnderlyingType, tpi);
}
default:
assert(false && "Type is not integral!");
return {0, false};
}
}
template <typename StreamWriter>
static DWARFExpression MakeLocationExpressionInternal(lldb::ModuleSP module,
StreamWriter &&writer) {
const ArchSpec &architecture = module->GetArchitecture();
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);
if (!writer(stream, register_kind))
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;
}
static DWARFExpression MakeRegisterBasedLocationExpressionInternal(
llvm::codeview::RegisterId reg, llvm::Optional<int32_t> relative_offset,
lldb::ModuleSP module) {
return MakeLocationExpressionInternal(
module, [&](Stream &stream, RegisterKind ®ister_kind) -> bool {
uint32_t reg_num = GetRegisterNumber(
module->GetArchitecture().GetMachine(), reg, register_kind);
if (reg_num == LLDB_INVALID_REGNUM)
return false;
if (reg_num > 31) {
llvm::dwarf::LocationAtom base = relative_offset
? llvm::dwarf::DW_OP_bregx
: llvm::dwarf::DW_OP_regx;
stream.PutHex8(base);
stream.PutULEB128(reg_num);
} else {
llvm::dwarf::LocationAtom base = relative_offset
? llvm::dwarf::DW_OP_breg0
: llvm::dwarf::DW_OP_reg0;
stream.PutHex8(base + reg_num);
}
if (relative_offset)
stream.PutSLEB128(*relative_offset);
return true;
});
}
DWARFExpression lldb_private::npdb::MakeEnregisteredLocationExpression(
llvm::codeview::RegisterId reg, lldb::ModuleSP module) {
return MakeRegisterBasedLocationExpressionInternal(reg, llvm::None, module);
}
DWARFExpression lldb_private::npdb::MakeRegRelLocationExpression(
llvm::codeview::RegisterId reg, int32_t offset, lldb::ModuleSP module) {
return MakeRegisterBasedLocationExpressionInternal(reg, offset, module);
}
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 lldb_private::npdb::MakeVFrameRelLocationExpression(
llvm::StringRef fpo_program, int32_t offset, lldb::ModuleSP module) {
return MakeLocationExpressionInternal(
module, [&](Stream &stream, RegisterKind ®ister_kind) -> bool {
const ArchSpec &architecture = module->GetArchitecture();
if (!EmitVFrameEvaluationDWARFExpression(fpo_program, architecture.GetMachine(),
stream))
return false;
stream.PutHex8(llvm::dwarf::DW_OP_consts);
stream.PutSLEB128(offset);
stream.PutHex8(llvm::dwarf::DW_OP_plus);
register_kind = eRegisterKindLLDB;
return true;
});
}
DWARFExpression lldb_private::npdb::MakeGlobalLocationExpression(
uint16_t section, uint32_t offset, ModuleSP module) {
assert(section > 0);
assert(module);
return MakeLocationExpressionInternal(
module, [&](Stream &stream, RegisterKind ®ister_kind) -> bool {
stream.PutHex8(llvm::dwarf::DW_OP_addr);
SectionList *section_list = module->GetSectionList();
assert(section_list);
auto section_ptr = section_list->FindSectionByID(section);
if (!section_ptr)
return false;
stream.PutMaxHex64(section_ptr->GetFileAddress() + offset,
stream.GetAddressByteSize(), stream.GetByteOrder());
return true;
});
}
DWARFExpression lldb_private::npdb::MakeConstantLocationExpression(
TypeIndex underlying_ti, TpiStream &tpi, const llvm::APSInt &constant,
ModuleSP module) {
const ArchSpec &architecture = module->GetArchitecture();
uint32_t address_size = architecture.GetAddressByteSize();
size_t size = 0;
bool is_signed = false;
std::tie(size, is_signed) = GetIntegralTypeInfo(underlying_ti, tpi);
union {
llvm::support::little64_t I;
llvm::support::ulittle64_t U;
} Value;
std::shared_ptr<DataBufferHeap> buffer = std::make_shared<DataBufferHeap>();
buffer->SetByteSize(size);
llvm::ArrayRef<uint8_t> bytes;
if (is_signed) {
Value.I = constant.getSExtValue();
} else {
Value.U = constant.getZExtValue();
}
bytes = llvm::makeArrayRef(reinterpret_cast<const uint8_t *>(&Value), 8)
.take_front(size);
buffer->CopyData(bytes.data(), size);
DataExtractor extractor(buffer, lldb::eByteOrderLittle, address_size);
DWARFExpression result(nullptr, extractor, nullptr);
return result;
}
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