mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-22 20:43:44 +02:00
b9ac00f6e5
Support for DW_FORM_implicit_const DWARFv5 feature. When this form is used attribute value goes to .debug_abbrev section (as SLEB). As this form would break any debug tool which doesn't support DWARFv5 it is guarded by dwarf version check. Attempt to use this form with dwarf version <= 4 is considered a fatal error. Differential Revision: https://reviews.llvm.org/D28456 llvm-svn: 291599
73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
//===-- DWARFDebugInfoEntry.cpp -------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "SyntaxHighlighting.h"
|
|
#include "llvm/DebugInfo/DWARF/DWARFCompileUnit.h"
|
|
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
|
|
#include "llvm/DebugInfo/DWARF/DWARFDebugAbbrev.h"
|
|
#include "llvm/DebugInfo/DWARF/DWARFDebugInfoEntry.h"
|
|
#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
|
|
#include "llvm/Support/DataTypes.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/Dwarf.h"
|
|
#include "llvm/Support/Format.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
using namespace llvm;
|
|
using namespace dwarf;
|
|
using namespace syntax;
|
|
|
|
bool DWARFDebugInfoEntry::extractFast(const DWARFUnit &U,
|
|
uint32_t *OffsetPtr) {
|
|
DataExtractor DebugInfoData = U.getDebugInfoExtractor();
|
|
const uint32_t UEndOffset = U.getNextUnitOffset();
|
|
return extractFast(U, OffsetPtr, DebugInfoData, UEndOffset, 0);
|
|
}
|
|
bool DWARFDebugInfoEntry::extractFast(const DWARFUnit &U, uint32_t *OffsetPtr,
|
|
const DataExtractor &DebugInfoData,
|
|
uint32_t UEndOffset, uint32_t D) {
|
|
Offset = *OffsetPtr;
|
|
Depth = D;
|
|
if (Offset >= UEndOffset || !DebugInfoData.isValidOffset(Offset))
|
|
return false;
|
|
uint64_t AbbrCode = DebugInfoData.getULEB128(OffsetPtr);
|
|
if (0 == AbbrCode) {
|
|
// NULL debug tag entry.
|
|
AbbrevDecl = nullptr;
|
|
return true;
|
|
}
|
|
AbbrevDecl = U.getAbbreviations()->getAbbreviationDeclaration(AbbrCode);
|
|
if (nullptr == AbbrevDecl) {
|
|
// Restore the original offset.
|
|
*OffsetPtr = Offset;
|
|
return false;
|
|
}
|
|
// See if all attributes in this DIE have fixed byte sizes. If so, we can
|
|
// just add this size to the offset to skip to the next DIE.
|
|
if (Optional<size_t> FixedSize = AbbrevDecl->getFixedAttributesByteSize(U)) {
|
|
*OffsetPtr += *FixedSize;
|
|
return true;
|
|
}
|
|
|
|
// Skip all data in the .debug_info for the attributes
|
|
for (const auto &AttrSpec : AbbrevDecl->attributes()) {
|
|
// Check if this attribute has a fixed byte size.
|
|
if (auto FixedSize = AttrSpec.getByteSize(U)) {
|
|
// Attribute byte size if fixed, just add the size to the offset.
|
|
*OffsetPtr += *FixedSize;
|
|
} else if (!DWARFFormValue::skipValue(AttrSpec.Form, DebugInfoData,
|
|
OffsetPtr, &U)) {
|
|
// We failed to skip this attribute's value, restore the original offset
|
|
// and return the failure status.
|
|
*OffsetPtr = Offset;
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|