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//===-- DWARFExpression.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/DebugInfo/DWARF/LowLevel/DWARFExpression.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/Format.h"
#include <cassert>
#include <cstdint>
#include <vector>
using namespace llvm;
using namespace dwarf;
namespace llvm {
typedef DWARFExpression::Operation Op;
typedef Op::Description Desc;
static std::vector<Desc> getOpDescriptions() {
std::vector<Desc> Descriptions;
Descriptions.resize(0xff);
Descriptions[DW_OP_addr] = Desc(Op::Dwarf2, Op::SizeAddr);
Descriptions[DW_OP_deref] = Desc(Op::Dwarf2);
Descriptions[DW_OP_const1u] = Desc(Op::Dwarf2, Op::Size1);
Descriptions[DW_OP_const1s] = Desc(Op::Dwarf2, Op::SignedSize1);
Descriptions[DW_OP_const2u] = Desc(Op::Dwarf2, Op::Size2);
Descriptions[DW_OP_const2s] = Desc(Op::Dwarf2, Op::SignedSize2);
Descriptions[DW_OP_const4u] = Desc(Op::Dwarf2, Op::Size4);
Descriptions[DW_OP_const4s] = Desc(Op::Dwarf2, Op::SignedSize4);
Descriptions[DW_OP_const8u] = Desc(Op::Dwarf2, Op::Size8);
Descriptions[DW_OP_const8s] = Desc(Op::Dwarf2, Op::SignedSize8);
Descriptions[DW_OP_constu] = Desc(Op::Dwarf2, Op::SizeLEB);
Descriptions[DW_OP_consts] = Desc(Op::Dwarf2, Op::SignedSizeLEB);
Descriptions[DW_OP_dup] = Desc(Op::Dwarf2);
Descriptions[DW_OP_drop] = Desc(Op::Dwarf2);
Descriptions[DW_OP_over] = Desc(Op::Dwarf2);
Descriptions[DW_OP_pick] = Desc(Op::Dwarf2, Op::Size1);
Descriptions[DW_OP_swap] = Desc(Op::Dwarf2);
Descriptions[DW_OP_rot] = Desc(Op::Dwarf2);
Descriptions[DW_OP_xderef] = Desc(Op::Dwarf2);
Descriptions[DW_OP_abs] = Desc(Op::Dwarf2);
Descriptions[DW_OP_and] = Desc(Op::Dwarf2);
Descriptions[DW_OP_div] = Desc(Op::Dwarf2);
Descriptions[DW_OP_minus] = Desc(Op::Dwarf2);
Descriptions[DW_OP_mod] = Desc(Op::Dwarf2);
Descriptions[DW_OP_mul] = Desc(Op::Dwarf2);
Descriptions[DW_OP_neg] = Desc(Op::Dwarf2);
Descriptions[DW_OP_not] = Desc(Op::Dwarf2);
Descriptions[DW_OP_or] = Desc(Op::Dwarf2);
Descriptions[DW_OP_plus] = Desc(Op::Dwarf2);
Descriptions[DW_OP_plus_uconst] = Desc(Op::Dwarf2, Op::SizeLEB);
Descriptions[DW_OP_shl] = Desc(Op::Dwarf2);
Descriptions[DW_OP_shr] = Desc(Op::Dwarf2);
Descriptions[DW_OP_shra] = Desc(Op::Dwarf2);
Descriptions[DW_OP_xor] = Desc(Op::Dwarf2);
Descriptions[DW_OP_bra] = Desc(Op::Dwarf2, Op::SignedSize2);
Descriptions[DW_OP_eq] = Desc(Op::Dwarf2);
Descriptions[DW_OP_ge] = Desc(Op::Dwarf2);
Descriptions[DW_OP_gt] = Desc(Op::Dwarf2);
Descriptions[DW_OP_le] = Desc(Op::Dwarf2);
Descriptions[DW_OP_lt] = Desc(Op::Dwarf2);
Descriptions[DW_OP_ne] = Desc(Op::Dwarf2);
Descriptions[DW_OP_skip] = Desc(Op::Dwarf2, Op::SignedSize2);
for (uint16_t LA = DW_OP_lit0; LA <= DW_OP_lit31; ++LA)
Descriptions[LA] = Desc(Op::Dwarf2);
for (uint16_t LA = DW_OP_reg0; LA <= DW_OP_reg31; ++LA)
Descriptions[LA] = Desc(Op::Dwarf2);
for (uint16_t LA = DW_OP_breg0; LA <= DW_OP_breg31; ++LA)
Descriptions[LA] = Desc(Op::Dwarf2, Op::SignedSizeLEB);
Descriptions[DW_OP_regx] = Desc(Op::Dwarf2, Op::SizeLEB);
Descriptions[DW_OP_fbreg] = Desc(Op::Dwarf2, Op::SignedSizeLEB);
Descriptions[DW_OP_bregx] = Desc(Op::Dwarf2, Op::SizeLEB, Op::SignedSizeLEB);
Descriptions[DW_OP_piece] = Desc(Op::Dwarf2, Op::SizeLEB);
Descriptions[DW_OP_deref_size] = Desc(Op::Dwarf2, Op::Size1);
Descriptions[DW_OP_xderef_size] = Desc(Op::Dwarf2, Op::Size1);
Descriptions[DW_OP_nop] = Desc(Op::Dwarf2);
Descriptions[DW_OP_push_object_address] = Desc(Op::Dwarf3);
Descriptions[DW_OP_call2] = Desc(Op::Dwarf3, Op::Size2);
Descriptions[DW_OP_call4] = Desc(Op::Dwarf3, Op::Size4);
Descriptions[DW_OP_call_ref] = Desc(Op::Dwarf3, Op::SizeRefAddr);
Descriptions[DW_OP_form_tls_address] = Desc(Op::Dwarf3);
Descriptions[DW_OP_call_frame_cfa] = Desc(Op::Dwarf3);
Descriptions[DW_OP_bit_piece] = Desc(Op::Dwarf3, Op::SizeLEB, Op::SizeLEB);
Descriptions[DW_OP_implicit_value] =
Desc(Op::Dwarf4, Op::SizeLEB, Op::SizeBlock);
Descriptions[DW_OP_stack_value] = Desc(Op::Dwarf4);
Descriptions[DW_OP_implicit_pointer] =
Desc(Op::Dwarf5, Op::SizeRefAddr, Op::SignedSizeLEB);
Descriptions[DW_OP_addrx] = Desc(Op::Dwarf5, Op::SizeLEB);
Descriptions[DW_OP_constx] = Desc(Op::Dwarf5, Op::SizeLEB);
Descriptions[DW_OP_entry_value] = Desc(Op::Dwarf5, Op::SizeLEB);
Descriptions[DW_OP_convert] = Desc(Op::Dwarf5, Op::BaseTypeRef);
Descriptions[DW_OP_regval_type] =
Desc(Op::Dwarf5, Op::SizeLEB, Op::BaseTypeRef);
Descriptions[DW_OP_WASM_location] =
Desc(Op::Dwarf4, Op::SizeLEB, Op::WasmLocationArg);
Descriptions[DW_OP_GNU_push_tls_address] = Desc(Op::Dwarf3);
Descriptions[DW_OP_GNU_addr_index] = Desc(Op::Dwarf4, Op::SizeLEB);
Descriptions[DW_OP_GNU_const_index] = Desc(Op::Dwarf4, Op::SizeLEB);
Descriptions[DW_OP_GNU_entry_value] = Desc(Op::Dwarf4, Op::SizeLEB);
Descriptions[DW_OP_GNU_implicit_pointer] =
Desc(Op::Dwarf4, Op::SizeRefAddr, Op::SignedSizeLEB);
// This Description acts as a marker that getSubOpDesc must be called
// to fetch the final Description for the operation. Each such final
// Description must share the same first SizeSubOpLEB operand.
Descriptions[DW_OP_LLVM_user] = Desc(Op::Dwarf5, Op::SizeSubOpLEB);
return Descriptions;
}
static Desc getDescImpl(ArrayRef<Desc> Descriptions, unsigned Opcode) {
// Handle possible corrupted or unsupported operation.
if (Opcode >= Descriptions.size())
return {};
return Descriptions[Opcode];
}
static Desc getOpDesc(unsigned Opcode) {
static std::vector<Desc> Descriptions = getOpDescriptions();
return getDescImpl(Descriptions, Opcode);
}
static std::vector<Desc> getSubOpDescriptions() {
static constexpr unsigned LlvmUserDescriptionsSize = 1
#define HANDLE_DW_OP_LLVM_USEROP(ID, NAME) +1
#include "llvm/BinaryFormat/Dwarf.def"
;
std::vector<Desc> Descriptions;
Descriptions.resize(LlvmUserDescriptionsSize);
Descriptions[DW_OP_LLVM_nop] = Desc(Op::Dwarf5, Op::SizeSubOpLEB);
return Descriptions;
}
static Desc getSubOpDesc(unsigned Opcode, unsigned SubOpcode) {
assert(Opcode == DW_OP_LLVM_user);
static std::vector<Desc> Descriptions = getSubOpDescriptions();
return getDescImpl(Descriptions, SubOpcode);
}
bool DWARFExpression::Operation::extract(DataExtractor Data,
uint8_t AddressSize, uint64_t Offset,
std::optional<DwarfFormat> Format) {
EndOffset = Offset;
Opcode = Data.getU8(&Offset);
Desc = getOpDesc(Opcode);
if (Desc.Version == Operation::DwarfNA)
return false;
Operands.resize(Desc.Op.size());
OperandEndOffsets.resize(Desc.Op.size());
for (unsigned Operand = 0; Operand < Desc.Op.size(); ++Operand) {
unsigned Size = Desc.Op[Operand];
unsigned Signed = Size & Operation::SignBit;
switch (Size & ~Operation::SignBit) {
case Operation::SizeSubOpLEB:
assert(Operand == 0 && "SubOp operand must be the first operand");
Operands[Operand] = Data.getULEB128(&Offset);
Desc = getSubOpDesc(Opcode, Operands[Operand]);
if (Desc.Version == Operation::DwarfNA)
return false;
assert(Desc.Op[Operand] == Operation::SizeSubOpLEB &&
"SizeSubOpLEB Description must begin with SizeSubOpLEB operand");
break;
case Operation::Size1:
Operands[Operand] = Data.getU8(&Offset);
if (Signed)
Operands[Operand] = (int8_t)Operands[Operand];
break;
case Operation::Size2:
Operands[Operand] = Data.getU16(&Offset);
if (Signed)
Operands[Operand] = (int16_t)Operands[Operand];
break;
case Operation::Size4:
Operands[Operand] = Data.getU32(&Offset);
if (Signed)
Operands[Operand] = (int32_t)Operands[Operand];
break;
case Operation::Size8:
Operands[Operand] = Data.getU64(&Offset);
break;
case Operation::SizeAddr:
Operands[Operand] = Data.getUnsigned(&Offset, AddressSize);
break;
case Operation::SizeRefAddr:
if (!Format)
return false;
Operands[Operand] =
Data.getUnsigned(&Offset, dwarf::getDwarfOffsetByteSize(*Format));
break;
case Operation::SizeLEB:
if (Signed)
Operands[Operand] = Data.getSLEB128(&Offset);
else
Operands[Operand] = Data.getULEB128(&Offset);
break;
case Operation::BaseTypeRef:
Operands[Operand] = Data.getULEB128(&Offset);
break;
case Operation::WasmLocationArg:
assert(Operand == 1);
switch (Operands[0]) {
case 0:
case 1:
case 2:
case 4:
Operands[Operand] = Data.getULEB128(&Offset);
break;
case 3: // global as uint32
Operands[Operand] = Data.getU32(&Offset);
break;
default:
return false; // Unknown Wasm location
}
break;
case Operation::SizeBlock:
// We need a size, so this cannot be the first operand
if (Operand == 0)
return false;
// Store the offset of the block as the value.
Operands[Operand] = Offset;
Offset += Operands[Operand - 1];
break;
default:
llvm_unreachable("Unknown DWARFExpression Op size");
}
OperandEndOffsets[Operand] = Offset;
}
EndOffset = Offset;
return true;
}
std::optional<unsigned> DWARFExpression::Operation::getSubCode() const {
if (!Desc.Op.size() || Desc.Op[0] != Operation::SizeSubOpLEB)
return std::nullopt;
return Operands[0];
}
bool DWARFExpression::operator==(const DWARFExpression &RHS) const {
if (AddressSize != RHS.AddressSize || Format != RHS.Format)
return false;
return Data.getData() == RHS.Data.getData();
}
} // namespace llvm
|
