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llvm-mirror/lib/DebugInfo/DWARF/DWARFDebugMacro.cpp
David Blaikie c5476c7c57 DebugInfo: Filter DWARFv5 TUs out of the debug_info unit list when CUs requested 
Since DWARFv5 places TUs in debug_info, some of DWARFContext's APIs have
become a bit erroneous, including TUs in the CU list by accident.
Correct that by providing compile_units (& dwo_compile_units) that
filter out the type units from the debug_info units.

Differential Revision: https://reviews.llvm.org/D87935
2020-09-23 22:15:53 -07:00

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//===- DWARFDebugMacro.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/DWARFDebugMacro.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
#include "llvm/Support/WithColor.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdint>
using namespace llvm;
using namespace dwarf;
DwarfFormat DWARFDebugMacro::MacroHeader::getDwarfFormat() const {
return Flags & MACRO_OFFSET_SIZE ? DWARF64 : DWARF32;
}
uint8_t DWARFDebugMacro::MacroHeader::getOffsetByteSize() const {
return getDwarfOffsetByteSize(getDwarfFormat());
}
void DWARFDebugMacro::MacroHeader::dumpMacroHeader(raw_ostream &OS) const {
// FIXME: Add support for dumping opcode_operands_table
OS << format("macro header: version = 0x%04" PRIx16, Version)
<< format(", flags = 0x%02" PRIx8, Flags)
<< ", format = " << FormatString(getDwarfFormat());
if (Flags & MACRO_DEBUG_LINE_OFFSET)
OS << format(", debug_line_offset = 0x%0*" PRIx64, 2 * getOffsetByteSize(),
DebugLineOffset);
OS << "\n";
}
void DWARFDebugMacro::dump(raw_ostream &OS) const {
unsigned IndLevel = 0;
for (const auto &Macros : MacroLists) {
OS << format("0x%08" PRIx64 ":\n", Macros.Offset);
if (Macros.IsDebugMacro)
Macros.Header.dumpMacroHeader(OS);
for (const Entry &E : Macros.Macros) {
// There should not be DW_MACINFO_end_file when IndLevel is Zero. However,
// this check handles the case of corrupted ".debug_macinfo" section.
if (IndLevel > 0)
IndLevel -= (E.Type == DW_MACINFO_end_file);
// Print indentation.
for (unsigned I = 0; I < IndLevel; I++)
OS << " ";
IndLevel += (E.Type == DW_MACINFO_start_file);
// Based on which version we are handling choose appropriate macro forms.
if (Macros.IsDebugMacro)
WithColor(OS, HighlightColor::Macro).get()
<< (Macros.Header.Version < 5 ? GnuMacroString(E.Type)
: MacroString(E.Type));
else
WithColor(OS, HighlightColor::Macro).get() << MacinfoString(E.Type);
switch (E.Type) {
default:
// Got a corrupted ".debug_macinfo/.debug_macro" section (invalid
// macinfo type).
break;
// debug_macro and debug_macinfo share some common encodings.
// DW_MACRO_define == DW_MACINFO_define
// DW_MACRO_undef == DW_MACINFO_undef
// DW_MACRO_start_file == DW_MACINFO_start_file
// DW_MACRO_end_file == DW_MACINFO_end_file
// For readability/uniformity we are using DW_MACRO_*.
//
// The GNU .debug_macro extension's entries have the same encoding
// as DWARF 5's DW_MACRO_* entries, so we only use the latter here.
case DW_MACRO_define:
case DW_MACRO_undef:
case DW_MACRO_define_strp:
case DW_MACRO_undef_strp:
case DW_MACRO_define_strx:
case DW_MACRO_undef_strx:
OS << " - lineno: " << E.Line;
OS << " macro: " << E.MacroStr;
break;
case DW_MACRO_start_file:
OS << " - lineno: " << E.Line;
OS << " filenum: " << E.File;
break;
case DW_MACRO_import:
OS << format(" - import offset: 0x%0*" PRIx64,
2 * Macros.Header.getOffsetByteSize(), E.ImportOffset);
break;
case DW_MACRO_end_file:
break;
case DW_MACINFO_vendor_ext:
OS << " - constant: " << E.ExtConstant;
OS << " string: " << E.ExtStr;
break;
}
OS << "\n";
}
}
}
Error DWARFDebugMacro::parseImpl(
Optional<DWARFUnitVector::compile_unit_range> Units,
Optional<DataExtractor> StringExtractor, DWARFDataExtractor Data,
bool IsMacro) {
uint64_t Offset = 0;
MacroList *M = nullptr;
using MacroToUnitsMap = DenseMap<uint64_t, DWARFUnit *>;
MacroToUnitsMap MacroToUnits;
if (IsMacro && Data.isValidOffset(Offset)) {
// Keep a mapping from Macro contribution to CUs, this will
// be needed while retrieving macro from DW_MACRO_define_strx form.
for (const auto &U : Units.getValue())
if (auto CUDIE = U->getUnitDIE())
// Skip units which does not contibutes to macro section.
if (auto MacroOffset = toSectionOffset(CUDIE.find(DW_AT_macros)))
MacroToUnits.try_emplace(*MacroOffset, U.get());
}
while (Data.isValidOffset(Offset)) {
if (!M) {
MacroLists.emplace_back();
M = &MacroLists.back();
M->Offset = Offset;
M->IsDebugMacro = IsMacro;
if (IsMacro) {
auto Err = M->Header.parseMacroHeader(Data, &Offset);
if (Err)
return Err;
}
}
// A macro list entry consists of:
M->Macros.emplace_back();
Entry &E = M->Macros.back();
// 1. Macinfo type
E.Type = Data.getULEB128(&Offset);
if (E.Type == 0) {
// Reached end of a ".debug_macinfo/debug_macro" section contribution.
M = nullptr;
continue;
}
switch (E.Type) {
default:
// Got a corrupted ".debug_macinfo" section (invalid macinfo type).
// Push the corrupted entry to the list and halt parsing.
E.Type = DW_MACINFO_invalid;
return Error::success();
// debug_macro and debug_macinfo share some common encodings.
// DW_MACRO_define == DW_MACINFO_define
// DW_MACRO_undef == DW_MACINFO_undef
// DW_MACRO_start_file == DW_MACINFO_start_file
// DW_MACRO_end_file == DW_MACINFO_end_file
// For readibility/uniformity we are using DW_MACRO_*.
case DW_MACRO_define:
case DW_MACRO_undef:
// 2. Source line
E.Line = Data.getULEB128(&Offset);
// 3. Macro string
E.MacroStr = Data.getCStr(&Offset);
break;
case DW_MACRO_define_strp:
case DW_MACRO_undef_strp: {
if (!IsMacro) {
// DW_MACRO_define_strp is a new form introduced in DWARFv5, it is
// not supported in debug_macinfo[.dwo] sections. Assume it as an
// invalid entry, push it and halt parsing.
E.Type = DW_MACINFO_invalid;
return Error::success();
}
uint64_t StrOffset = 0;
// 2. Source line
E.Line = Data.getULEB128(&Offset);
// 3. Macro string
StrOffset =
Data.getRelocatedValue(M->Header.getOffsetByteSize(), &Offset);
assert(StringExtractor && "String Extractor not found");
E.MacroStr = StringExtractor->getCStr(&StrOffset);
break;
}
case DW_MACRO_define_strx:
case DW_MACRO_undef_strx: {
if (!IsMacro) {
// DW_MACRO_define_strx is a new form introduced in DWARFv5, it is
// not supported in debug_macinfo[.dwo] sections. Assume it as an
// invalid entry, push it and halt parsing.
E.Type = DW_MACINFO_invalid;
return Error::success();
}
E.Line = Data.getULEB128(&Offset);
auto MacroContributionOffset = MacroToUnits.find(M->Offset);
if (MacroContributionOffset == MacroToUnits.end())
return createStringError(errc::invalid_argument,
"Macro contribution of the unit not found");
Optional<uint64_t> StrOffset =
MacroContributionOffset->second->getStringOffsetSectionItem(
Data.getULEB128(&Offset));
if (!StrOffset)
return createStringError(
errc::invalid_argument,
"String offsets contribution of the unit not found");
E.MacroStr =
MacroContributionOffset->second->getStringExtractor().getCStr(
&*StrOffset);
break;
}
case DW_MACRO_start_file:
// 2. Source line
E.Line = Data.getULEB128(&Offset);
// 3. Source file id
E.File = Data.getULEB128(&Offset);
break;
case DW_MACRO_end_file:
break;
case DW_MACRO_import:
E.ImportOffset =
Data.getRelocatedValue(M->Header.getOffsetByteSize(), &Offset);
break;
case DW_MACINFO_vendor_ext:
// 2. Vendor extension constant
E.ExtConstant = Data.getULEB128(&Offset);
// 3. Vendor extension string
E.ExtStr = Data.getCStr(&Offset);
break;
}
}
return Error::success();
}
Error DWARFDebugMacro::MacroHeader::parseMacroHeader(DWARFDataExtractor Data,
uint64_t *Offset) {
Version = Data.getU16(Offset);
uint8_t FlagData = Data.getU8(Offset);
// FIXME: Add support for parsing opcode_operands_table
if (FlagData & MACRO_OPCODE_OPERANDS_TABLE)
return createStringError(errc::not_supported,
"opcode_operands_table is not supported");
Flags = FlagData;
if (Flags & MACRO_DEBUG_LINE_OFFSET)
DebugLineOffset = Data.getUnsigned(Offset, getOffsetByteSize());
return Error::success();
}
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