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//===- DWARFCFIProgram.cpp - Parsing the cfi-portions of .debug_frame -----===//
//
// 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/DWARFCFIProgram.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <cinttypes>
#include <cstdint>
using namespace llvm;
using namespace dwarf;
StringRef CFIProgram::callFrameString(unsigned Opcode) const {
return dwarf::CallFrameString(Opcode, Arch);
}
const char *CFIProgram::operandTypeString(CFIProgram::OperandType OT) {
#define ENUM_TO_CSTR(e) \
case e: \
return #e;
switch (OT) {
ENUM_TO_CSTR(OT_Unset);
ENUM_TO_CSTR(OT_None);
ENUM_TO_CSTR(OT_Address);
ENUM_TO_CSTR(OT_Offset);
ENUM_TO_CSTR(OT_FactoredCodeOffset);
ENUM_TO_CSTR(OT_SignedFactDataOffset);
ENUM_TO_CSTR(OT_UnsignedFactDataOffset);
ENUM_TO_CSTR(OT_Register);
ENUM_TO_CSTR(OT_AddressSpace);
ENUM_TO_CSTR(OT_Expression);
}
return "<unknown CFIProgram::OperandType>";
}
llvm::Expected<uint64_t>
CFIProgram::Instruction::getOperandAsUnsigned(const CFIProgram &CFIP,
uint32_t OperandIdx) const {
if (OperandIdx >= MaxOperands)
return createStringError(errc::invalid_argument,
"operand index %" PRIu32 " is not valid",
OperandIdx);
OperandType Type = CFIP.getOperandTypes()[Opcode][OperandIdx];
uint64_t Operand = Ops[OperandIdx];
switch (Type) {
case OT_Unset:
case OT_None:
case OT_Expression:
return createStringError(errc::invalid_argument,
"op[%" PRIu32 "] has type %s which has no value",
OperandIdx, CFIProgram::operandTypeString(Type));
case OT_Offset:
case OT_SignedFactDataOffset:
case OT_UnsignedFactDataOffset:
return createStringError(
errc::invalid_argument,
"op[%" PRIu32 "] has OperandType OT_Offset which produces a signed "
"result, call getOperandAsSigned instead",
OperandIdx);
case OT_Address:
case OT_Register:
case OT_AddressSpace:
return Operand;
case OT_FactoredCodeOffset: {
const uint64_t CodeAlignmentFactor = CFIP.codeAlign();
if (CodeAlignmentFactor == 0)
return createStringError(
errc::invalid_argument,
"op[%" PRIu32 "] has type OT_FactoredCodeOffset but code alignment "
"is zero",
OperandIdx);
return Operand * CodeAlignmentFactor;
}
}
llvm_unreachable("invalid operand type");
}
llvm::Expected<int64_t>
CFIProgram::Instruction::getOperandAsSigned(const CFIProgram &CFIP,
uint32_t OperandIdx) const {
if (OperandIdx >= MaxOperands)
return createStringError(errc::invalid_argument,
"operand index %" PRIu32 " is not valid",
OperandIdx);
OperandType Type = CFIP.getOperandTypes()[Opcode][OperandIdx];
uint64_t Operand = Ops[OperandIdx];
switch (Type) {
case OT_Unset:
case OT_None:
case OT_Expression:
return createStringError(errc::invalid_argument,
"op[%" PRIu32 "] has type %s which has no value",
OperandIdx, CFIProgram::operandTypeString(Type));
case OT_Address:
case OT_Register:
case OT_AddressSpace:
return createStringError(
errc::invalid_argument,
"op[%" PRIu32 "] has OperandType %s which produces an unsigned result, "
"call getOperandAsUnsigned instead",
OperandIdx, CFIProgram::operandTypeString(Type));
case OT_Offset:
return (int64_t)Operand;
case OT_FactoredCodeOffset:
case OT_SignedFactDataOffset: {
const int64_t DataAlignmentFactor = CFIP.dataAlign();
if (DataAlignmentFactor == 0)
return createStringError(errc::invalid_argument,
"op[%" PRIu32 "] has type %s but data "
"alignment is zero",
OperandIdx, CFIProgram::operandTypeString(Type));
return int64_t(Operand) * DataAlignmentFactor;
}
case OT_UnsignedFactDataOffset: {
const int64_t DataAlignmentFactor = CFIP.dataAlign();
if (DataAlignmentFactor == 0)
return createStringError(errc::invalid_argument,
"op[%" PRIu32
"] has type OT_UnsignedFactDataOffset but data "
"alignment is zero",
OperandIdx);
return Operand * DataAlignmentFactor;
}
}
llvm_unreachable("invalid operand type");
}
ArrayRef<CFIProgram::OperandType[CFIProgram::MaxOperands]>
CFIProgram::getOperandTypes() {
static OperandType OpTypes[DW_CFA_restore + 1][MaxOperands];
static bool Initialized = false;
if (Initialized) {
return ArrayRef<OperandType[MaxOperands]>(&OpTypes[0], DW_CFA_restore + 1);
}
Initialized = true;
#define DECLARE_OP3(OP, OPTYPE0, OPTYPE1, OPTYPE2) \
do { \
OpTypes[OP][0] = OPTYPE0; \
OpTypes[OP][1] = OPTYPE1; \
OpTypes[OP][2] = OPTYPE2; \
} while (false)
#define DECLARE_OP2(OP, OPTYPE0, OPTYPE1) \
DECLARE_OP3(OP, OPTYPE0, OPTYPE1, OT_None)
#define DECLARE_OP1(OP, OPTYPE0) DECLARE_OP2(OP, OPTYPE0, OT_None)
#define DECLARE_OP0(OP) DECLARE_OP1(OP, OT_None)
DECLARE_OP1(DW_CFA_set_loc, OT_Address);
DECLARE_OP1(DW_CFA_advance_loc, OT_FactoredCodeOffset);
DECLARE_OP1(DW_CFA_advance_loc1, OT_FactoredCodeOffset);
DECLARE_OP1(DW_CFA_advance_loc2, OT_FactoredCodeOffset);
DECLARE_OP1(DW_CFA_advance_loc4, OT_FactoredCodeOffset);
DECLARE_OP1(DW_CFA_MIPS_advance_loc8, OT_FactoredCodeOffset);
DECLARE_OP2(DW_CFA_def_cfa, OT_Register, OT_Offset);
DECLARE_OP2(DW_CFA_def_cfa_sf, OT_Register, OT_SignedFactDataOffset);
DECLARE_OP1(DW_CFA_def_cfa_register, OT_Register);
DECLARE_OP3(DW_CFA_LLVM_def_aspace_cfa, OT_Register, OT_Offset,
OT_AddressSpace);
DECLARE_OP3(DW_CFA_LLVM_def_aspace_cfa_sf, OT_Register,
OT_SignedFactDataOffset, OT_AddressSpace);
DECLARE_OP1(DW_CFA_def_cfa_offset, OT_Offset);
DECLARE_OP1(DW_CFA_def_cfa_offset_sf, OT_SignedFactDataOffset);
DECLARE_OP1(DW_CFA_def_cfa_expression, OT_Expression);
DECLARE_OP1(DW_CFA_undefined, OT_Register);
DECLARE_OP1(DW_CFA_same_value, OT_Register);
DECLARE_OP2(DW_CFA_offset, OT_Register, OT_UnsignedFactDataOffset);
DECLARE_OP2(DW_CFA_offset_extended, OT_Register, OT_UnsignedFactDataOffset);
DECLARE_OP2(DW_CFA_offset_extended_sf, OT_Register, OT_SignedFactDataOffset);
DECLARE_OP2(DW_CFA_val_offset, OT_Register, OT_UnsignedFactDataOffset);
DECLARE_OP2(DW_CFA_val_offset_sf, OT_Register, OT_SignedFactDataOffset);
DECLARE_OP2(DW_CFA_register, OT_Register, OT_Register);
DECLARE_OP2(DW_CFA_expression, OT_Register, OT_Expression);
DECLARE_OP2(DW_CFA_val_expression, OT_Register, OT_Expression);
DECLARE_OP1(DW_CFA_restore, OT_Register);
DECLARE_OP1(DW_CFA_restore_extended, OT_Register);
DECLARE_OP0(DW_CFA_remember_state);
DECLARE_OP0(DW_CFA_restore_state);
DECLARE_OP0(DW_CFA_GNU_window_save);
DECLARE_OP0(DW_CFA_AARCH64_negate_ra_state_with_pc);
DECLARE_OP1(DW_CFA_GNU_args_size, OT_Offset);
DECLARE_OP0(DW_CFA_nop);
#undef DECLARE_OP0
#undef DECLARE_OP1
#undef DECLARE_OP2
return ArrayRef<OperandType[MaxOperands]>(&OpTypes[0], DW_CFA_restore + 1);
}
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