b881949ee4
This was originally introduced to support kalimba DSPs featuring 24-bit bytes by f03e6d84 and also c928de3e, but the kalimba support was mostly removed by f8819bd5. This change removes the rest of the support, which was far from complete.
300 lines
10 KiB
C++
300 lines
10 KiB
C++
//===-- DWARFLocationExpression.cpp ---------------------------------------===//
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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 "DWARFLocationExpression.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/Section.h"
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#include "lldb/Expression/DWARFExpression.h"
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#include "lldb/Utility/ArchSpec.h"
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#include "lldb/Utility/DataBufferHeap.h"
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#include "lldb/Utility/StreamBuffer.h"
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#include "llvm/BinaryFormat/Dwarf.h"
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#include "llvm/DebugInfo/CodeView/TypeDeserializer.h"
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#include "llvm/DebugInfo/CodeView/TypeIndex.h"
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#include "llvm/DebugInfo/PDB/Native/TpiStream.h"
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#include "llvm/Support/Endian.h"
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#include "PdbUtil.h"
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#include "CodeViewRegisterMapping.h"
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#include "PdbFPOProgramToDWARFExpression.h"
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#include <optional>
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using namespace lldb;
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using namespace lldb_private;
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using namespace lldb_private::npdb;
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using namespace llvm::codeview;
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using namespace llvm::pdb;
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uint32_t GetGenericRegisterNumber(llvm::codeview::RegisterId register_id) {
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if (register_id == llvm::codeview::RegisterId::VFRAME)
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return LLDB_REGNUM_GENERIC_FP;
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return LLDB_INVALID_REGNUM;
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}
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static uint32_t GetRegisterNumber(llvm::Triple::ArchType arch_type,
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llvm::codeview::RegisterId register_id,
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RegisterKind ®ister_kind) {
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register_kind = eRegisterKindLLDB;
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uint32_t reg_num = GetLLDBRegisterNumber(arch_type, register_id);
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if (reg_num != LLDB_INVALID_REGNUM)
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return reg_num;
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register_kind = eRegisterKindGeneric;
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return GetGenericRegisterNumber(register_id);
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}
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static bool IsSimpleTypeSignedInteger(SimpleTypeKind kind) {
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switch (kind) {
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case SimpleTypeKind::Int128:
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case SimpleTypeKind::Int64:
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case SimpleTypeKind::Int64Quad:
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case SimpleTypeKind::Int32:
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case SimpleTypeKind::Int32Long:
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case SimpleTypeKind::Int16:
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case SimpleTypeKind::Int16Short:
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case SimpleTypeKind::Float128:
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case SimpleTypeKind::Float80:
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case SimpleTypeKind::Float64:
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case SimpleTypeKind::Float32:
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case SimpleTypeKind::Float16:
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case SimpleTypeKind::NarrowCharacter:
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case SimpleTypeKind::SignedCharacter:
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case SimpleTypeKind::SByte:
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return true;
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default:
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return false;
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}
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}
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static std::pair<size_t, bool> GetIntegralTypeInfo(TypeIndex ti,
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TpiStream &tpi) {
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if (ti.isSimple()) {
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SimpleTypeKind stk = ti.getSimpleKind();
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return {GetTypeSizeForSimpleKind(stk), IsSimpleTypeSignedInteger(stk)};
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}
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CVType cvt = tpi.getType(ti);
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switch (cvt.kind()) {
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case LF_MODIFIER: {
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ModifierRecord mfr;
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llvm::cantFail(TypeDeserializer::deserializeAs<ModifierRecord>(cvt, mfr));
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return GetIntegralTypeInfo(mfr.ModifiedType, tpi);
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}
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case LF_POINTER: {
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PointerRecord pr;
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llvm::cantFail(TypeDeserializer::deserializeAs<PointerRecord>(cvt, pr));
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return {pr.getSize(), false};
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}
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case LF_ENUM: {
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EnumRecord er;
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llvm::cantFail(TypeDeserializer::deserializeAs<EnumRecord>(cvt, er));
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return GetIntegralTypeInfo(er.UnderlyingType, tpi);
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}
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default:
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assert(false && "Type is not integral!");
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return {0, false};
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}
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}
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template <typename StreamWriter>
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static DWARFExpression MakeLocationExpressionInternal(lldb::ModuleSP module,
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StreamWriter &&writer) {
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const ArchSpec &architecture = module->GetArchitecture();
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ByteOrder byte_order = architecture.GetByteOrder();
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uint32_t address_size = architecture.GetAddressByteSize();
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if (byte_order == eByteOrderInvalid || address_size == 0)
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return DWARFExpression();
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RegisterKind register_kind = eRegisterKindDWARF;
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StreamBuffer<32> stream(Stream::eBinary, address_size, byte_order);
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if (!writer(stream, register_kind))
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return DWARFExpression();
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DataBufferSP buffer =
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std::make_shared<DataBufferHeap>(stream.GetData(), stream.GetSize());
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DataExtractor extractor(buffer, byte_order, address_size);
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DWARFExpression result(extractor);
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result.SetRegisterKind(register_kind);
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return result;
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}
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static bool MakeRegisterBasedLocationExpressionInternal(
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Stream &stream, llvm::codeview::RegisterId reg, RegisterKind ®ister_kind,
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std::optional<int32_t> relative_offset, lldb::ModuleSP module) {
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uint32_t reg_num = GetRegisterNumber(module->GetArchitecture().GetMachine(),
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reg, register_kind);
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if (reg_num == LLDB_INVALID_REGNUM)
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return false;
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if (reg_num > 31) {
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llvm::dwarf::LocationAtom base =
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relative_offset ? llvm::dwarf::DW_OP_bregx : llvm::dwarf::DW_OP_regx;
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stream.PutHex8(base);
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stream.PutULEB128(reg_num);
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} else {
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llvm::dwarf::LocationAtom base =
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relative_offset ? llvm::dwarf::DW_OP_breg0 : llvm::dwarf::DW_OP_reg0;
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stream.PutHex8(base + reg_num);
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}
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if (relative_offset)
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stream.PutSLEB128(*relative_offset);
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return true;
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}
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static DWARFExpression MakeRegisterBasedLocationExpressionInternal(
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llvm::codeview::RegisterId reg, std::optional<int32_t> relative_offset,
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lldb::ModuleSP module) {
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return MakeLocationExpressionInternal(
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module, [&](Stream &stream, RegisterKind ®ister_kind) -> bool {
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return MakeRegisterBasedLocationExpressionInternal(
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stream, reg, register_kind, relative_offset, module);
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});
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}
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DWARFExpression lldb_private::npdb::MakeEnregisteredLocationExpression(
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llvm::codeview::RegisterId reg, lldb::ModuleSP module) {
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return MakeRegisterBasedLocationExpressionInternal(reg, std::nullopt, module);
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}
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DWARFExpression lldb_private::npdb::MakeRegRelLocationExpression(
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llvm::codeview::RegisterId reg, int32_t offset, lldb::ModuleSP module) {
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return MakeRegisterBasedLocationExpressionInternal(reg, offset, module);
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}
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static bool EmitVFrameEvaluationDWARFExpression(
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llvm::StringRef program, llvm::Triple::ArchType arch_type, Stream &stream) {
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// VFrame value always stored in $TO pseudo-register
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return TranslateFPOProgramToDWARFExpression(program, "$T0", arch_type,
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stream);
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}
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DWARFExpression lldb_private::npdb::MakeVFrameRelLocationExpression(
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llvm::StringRef fpo_program, int32_t offset, lldb::ModuleSP module) {
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return MakeLocationExpressionInternal(
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module, [&](Stream &stream, RegisterKind ®ister_kind) -> bool {
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const ArchSpec &architecture = module->GetArchitecture();
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if (!EmitVFrameEvaluationDWARFExpression(fpo_program, architecture.GetMachine(),
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stream))
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return false;
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stream.PutHex8(llvm::dwarf::DW_OP_consts);
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stream.PutSLEB128(offset);
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stream.PutHex8(llvm::dwarf::DW_OP_plus);
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register_kind = eRegisterKindLLDB;
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return true;
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});
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}
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DWARFExpression lldb_private::npdb::MakeGlobalLocationExpression(
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uint16_t section, uint32_t offset, ModuleSP module) {
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assert(section > 0);
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assert(module);
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return MakeLocationExpressionInternal(
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module, [&](Stream &stream, RegisterKind ®ister_kind) -> bool {
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stream.PutHex8(llvm::dwarf::DW_OP_addr);
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SectionList *section_list = module->GetSectionList();
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assert(section_list);
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auto section_ptr = section_list->FindSectionByID(section);
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if (!section_ptr)
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return false;
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stream.PutMaxHex64(section_ptr->GetFileAddress() + offset,
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stream.GetAddressByteSize(), stream.GetByteOrder());
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return true;
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});
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}
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DWARFExpression lldb_private::npdb::MakeConstantLocationExpression(
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TypeIndex underlying_ti, TpiStream &tpi, const llvm::APSInt &constant,
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ModuleSP module) {
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const ArchSpec &architecture = module->GetArchitecture();
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uint32_t address_size = architecture.GetAddressByteSize();
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size_t size = 0;
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bool is_signed = false;
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std::tie(size, is_signed) = GetIntegralTypeInfo(underlying_ti, tpi);
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union {
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llvm::support::little64_t I;
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llvm::support::ulittle64_t U;
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} Value;
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std::shared_ptr<DataBufferHeap> buffer = std::make_shared<DataBufferHeap>();
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buffer->SetByteSize(size);
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llvm::ArrayRef<uint8_t> bytes;
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if (is_signed) {
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Value.I = constant.getSExtValue();
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} else {
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Value.U = constant.getZExtValue();
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}
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bytes = llvm::ArrayRef(reinterpret_cast<const uint8_t *>(&Value), 8)
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.take_front(size);
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buffer->CopyData(bytes.data(), size);
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DataExtractor extractor(buffer, lldb::eByteOrderLittle, address_size);
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DWARFExpression result(extractor);
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return result;
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}
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DWARFExpression
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lldb_private::npdb::MakeEnregisteredLocationExpressionForComposite(
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const std::map<uint64_t, MemberValLocation> &offset_to_location,
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std::map<uint64_t, size_t> &offset_to_size, size_t total_size,
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lldb::ModuleSP module) {
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return MakeLocationExpressionInternal(
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module, [&](Stream &stream, RegisterKind ®ister_kind) -> bool {
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size_t cur_offset = 0;
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bool is_simple_type = offset_to_size.empty();
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// Iterate through offset_to_location because offset_to_size might be
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// empty if the variable is a simple type.
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for (const auto &offset_loc : offset_to_location) {
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if (cur_offset < offset_loc.first) {
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stream.PutHex8(llvm::dwarf::DW_OP_piece);
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stream.PutULEB128(offset_loc.first - cur_offset);
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cur_offset = offset_loc.first;
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}
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MemberValLocation loc = offset_loc.second;
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std::optional<int32_t> offset =
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loc.is_at_reg ? std::nullopt
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: std::optional<int32_t>(loc.reg_offset);
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if (!MakeRegisterBasedLocationExpressionInternal(
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stream, (RegisterId)loc.reg_id, register_kind, offset,
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module))
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return false;
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if (!is_simple_type) {
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stream.PutHex8(llvm::dwarf::DW_OP_piece);
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stream.PutULEB128(offset_to_size[offset_loc.first]);
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cur_offset = offset_loc.first + offset_to_size[offset_loc.first];
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}
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}
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// For simple type, it specifies the byte size of the value described by
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// the previous dwarf expr. For udt, it's the remaining byte size at end
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// of a struct.
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if (total_size > cur_offset) {
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stream.PutHex8(llvm::dwarf::DW_OP_piece);
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stream.PutULEB128(total_size - cur_offset);
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}
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return true;
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});
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}
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