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//===----------------------------------------------------------------------===//
//
// 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/DWARFUnwindTablePrinter.h"
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/DebugInfo/DWARF/DWARFExpressionPrinter.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <cinttypes>
#include <cstdint>
#include <optional>
using namespace llvm;
using namespace dwarf;
static void printRegister(raw_ostream &OS, DIDumpOptions DumpOpts,
unsigned RegNum) {
if (DumpOpts.GetNameForDWARFReg) {
auto RegName = DumpOpts.GetNameForDWARFReg(RegNum, DumpOpts.IsEH);
if (!RegName.empty()) {
OS << RegName;
return;
}
}
OS << "reg" << RegNum;
}
/// Print an unwind location expression as text and use the register information
/// if some is provided.
///
/// \param R the unwind location to print.
///
/// \param OS the stream to use for output.
///
/// \param MRI register information that helps emit register names insteead
/// of raw register numbers.
///
/// \param IsEH true if the DWARF Call Frame Information is from .eh_frame
/// instead of from .debug_frame. This is needed for register number
/// conversion because some register numbers differ between the two sections
/// for certain architectures like x86.
static void printUnwindLocation(const UnwindLocation &UL, raw_ostream &OS,
DIDumpOptions DumpOpts) {
if (UL.getDereference())
OS << '[';
switch (UL.getLocation()) {
case UnwindLocation::Unspecified:
OS << "unspecified";
break;
case UnwindLocation::Undefined:
OS << "undefined";
break;
case UnwindLocation::Same:
OS << "same";
break;
case UnwindLocation::CFAPlusOffset:
OS << "CFA";
if (UL.getOffset() == 0)
break;
if (UL.getOffset() > 0)
OS << "+";
OS << UL.getOffset();
break;
case UnwindLocation::RegPlusOffset:
printRegister(OS, DumpOpts, UL.getRegister());
if (UL.getOffset() == 0 && !UL.hasAddressSpace())
break;
if (UL.getOffset() >= 0)
OS << "+";
OS << UL.getOffset();
if (UL.hasAddressSpace())
OS << " in addrspace" << UL.getAddressSpace();
break;
case UnwindLocation::DWARFExpr: {
if (UL.getDWARFExpressionBytes()) {
auto Expr = *UL.getDWARFExpressionBytes();
printDwarfExpression(&Expr, OS, DumpOpts, nullptr);
}
break;
}
case UnwindLocation::Constant:
OS << UL.getOffset();
break;
}
if (UL.getDereference())
OS << ']';
}
raw_ostream &llvm::dwarf::operator<<(raw_ostream &OS,
const UnwindLocation &UL) {
auto DumpOpts = DIDumpOptions();
printUnwindLocation(UL, OS, DumpOpts);
return OS;
}
/// Print all registers + locations that are currently defined in a register
/// locations.
///
/// \param RL the register locations to print.
///
/// \param OS the stream to use for output.
///
/// \param MRI register information that helps emit register names insteead
/// of raw register numbers.
///
/// \param IsEH true if the DWARF Call Frame Information is from .eh_frame
/// instead of from .debug_frame. This is needed for register number
/// conversion because some register numbers differ between the two sections
/// for certain architectures like x86.
static void printRegisterLocations(const RegisterLocations &RL, raw_ostream &OS,
DIDumpOptions DumpOpts) {
bool First = true;
for (uint32_t Reg : RL.getRegisters()) {
auto Loc = *RL.getRegisterLocation(Reg);
if (First)
First = false;
else
OS << ", ";
printRegister(OS, DumpOpts, Reg);
OS << '=';
printUnwindLocation(Loc, OS, DumpOpts);
}
}
raw_ostream &llvm::dwarf::operator<<(raw_ostream &OS,
const RegisterLocations &RL) {
auto DumpOpts = DIDumpOptions();
printRegisterLocations(RL, OS, DumpOpts);
return OS;
}
/// Print an UnwindRow to the stream.
///
/// \param Row the UnwindRow to print.
///
/// \param OS the stream to use for output.
///
/// \param MRI register information that helps emit register names insteead
/// of raw register numbers.
///
/// \param IsEH true if the DWARF Call Frame Information is from .eh_frame
/// instead of from .debug_frame. This is needed for register number
/// conversion because some register numbers differ between the two sections
/// for certain architectures like x86.
///
/// \param IndentLevel specify the indent level as an integer. The UnwindRow
/// will be output to the stream preceded by 2 * IndentLevel number of spaces.
static void printUnwindRow(const UnwindRow &Row, raw_ostream &OS,
DIDumpOptions DumpOpts, unsigned IndentLevel) {
OS.indent(2 * IndentLevel);
if (Row.hasAddress())
OS << format("0x%" PRIx64 ": ", Row.getAddress());
OS << "CFA=";
printUnwindLocation(Row.getCFAValue(), OS, DumpOpts);
if (Row.getRegisterLocations().hasLocations()) {
OS << ": ";
printRegisterLocations(Row.getRegisterLocations(), OS, DumpOpts);
}
OS << "\n";
}
raw_ostream &llvm::dwarf::operator<<(raw_ostream &OS, const UnwindRow &Row) {
auto DumpOpts = DIDumpOptions();
printUnwindRow(Row, OS, DumpOpts, 0);
return OS;
}
void llvm::dwarf::printUnwindTable(const UnwindTable &Rows, raw_ostream &OS,
DIDumpOptions DumpOpts,
unsigned IndentLevel) {
for (const UnwindRow &Row : Rows)
printUnwindRow(Row, OS, DumpOpts, IndentLevel);
}
raw_ostream &llvm::dwarf::operator<<(raw_ostream &OS, const UnwindTable &Rows) {
auto DumpOpts = DIDumpOptions();
printUnwindTable(Rows, OS, DumpOpts, 0);
return OS;
}
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