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llvm-mirror/lib/DebugInfo/DWARFDebugInfoEntry.cpp

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//===-- DWARFDebugInfoEntry.cpp -------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "DWARFDebugInfoEntry.h"
#include "DWARFCompileUnit.h"
#include "DWARFContext.h"
#include "DWARFDebugAbbrev.h"
#include "llvm/DebugInfo/DWARFFormValue.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;
typedef DILineInfoSpecifier::FunctionNameKind FunctionNameKind;
void DWARFDebugInfoEntryMinimal::dump(raw_ostream &OS, const DWARFUnit *u,
unsigned recurseDepth,
unsigned indent) const {
DataExtractor debug_info_data = u->getDebugInfoExtractor();
uint32_t offset = Offset;
if (debug_info_data.isValidOffset(offset)) {
uint32_t abbrCode = debug_info_data.getULEB128(&offset);
OS << format("\n0x%8.8x: ", Offset);
if (abbrCode) {
if (AbbrevDecl) {
const char *tagString = TagString(getTag());
if (tagString)
OS.indent(indent) << tagString;
else
OS.indent(indent) << format("DW_TAG_Unknown_%x", getTag());
OS << format(" [%u] %c\n", abbrCode,
AbbrevDecl->hasChildren() ? '*' : ' ');
// Dump all data in the DIE for the attributes.
for (const auto &AttrSpec : AbbrevDecl->attributes()) {
dumpAttribute(OS, u, &offset, AttrSpec.Attr, AttrSpec.Form, indent);
}
const DWARFDebugInfoEntryMinimal *child = getFirstChild();
if (recurseDepth > 0 && child) {
while (child) {
child->dump(OS, u, recurseDepth-1, indent+2);
child = child->getSibling();
}
}
} else {
OS << "Abbreviation code not found in 'debug_abbrev' class for code: "
<< abbrCode << '\n';
}
} else {
OS.indent(indent) << "NULL\n";
}
}
}
void DWARFDebugInfoEntryMinimal::dumpAttribute(raw_ostream &OS,
const DWARFUnit *u,
uint32_t *offset_ptr,
uint16_t attr, uint16_t form,
unsigned indent) const {
OS << " ";
OS.indent(indent+2);
const char *attrString = AttributeString(attr);
if (attrString)
OS << attrString;
else
OS << format("DW_AT_Unknown_%x", attr);
const char *formString = FormEncodingString(form);
if (formString)
OS << " [" << formString << ']';
else
OS << format(" [DW_FORM_Unknown_%x]", form);
DWARFFormValue formValue(form);
if (!formValue.extractValue(u->getDebugInfoExtractor(), offset_ptr, u))
return;
OS << "\t(";
formValue.dump(OS, u);
OS << ")\n";
}
bool DWARFDebugInfoEntryMinimal::extractFast(const DWARFUnit *U,
uint32_t *OffsetPtr) {
Offset = *OffsetPtr;
DataExtractor DebugInfoData = U->getDebugInfoExtractor();
uint32_t UEndOffset = U->getNextUnitOffset();
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;
}
ArrayRef<uint8_t> FixedFormSizes = DWARFFormValue::getFixedFormSizes(
U->getAddressByteSize(), U->getVersion());
assert(FixedFormSizes.size() > 0);
// Skip all data in the .debug_info for the attributes
for (const auto &AttrSpec : AbbrevDecl->attributes()) {
uint16_t Form = AttrSpec.Form;
uint8_t FixedFormSize =
(Form < FixedFormSizes.size()) ? FixedFormSizes[Form] : 0;
if (FixedFormSize)
*OffsetPtr += FixedFormSize;
else if (!DWARFFormValue::skipValue(Form, DebugInfoData, OffsetPtr, U)) {
// Restore the original offset.
*OffsetPtr = Offset;
return false;
}
}
return true;
}
bool DWARFDebugInfoEntryMinimal::isSubprogramDIE() const {
return getTag() == DW_TAG_subprogram;
}
bool DWARFDebugInfoEntryMinimal::isSubroutineDIE() const {
uint32_t Tag = getTag();
return Tag == DW_TAG_subprogram ||
Tag == DW_TAG_inlined_subroutine;
}
bool DWARFDebugInfoEntryMinimal::getAttributeValue(
const DWARFUnit *U, const uint16_t Attr, DWARFFormValue &FormValue) const {
if (!AbbrevDecl)
return false;
uint32_t AttrIdx = AbbrevDecl->findAttributeIndex(Attr);
if (AttrIdx == -1U)
return false;
DataExtractor DebugInfoData = U->getDebugInfoExtractor();
uint32_t DebugInfoOffset = getOffset();
// Skip the abbreviation code so we are at the data for the attributes
DebugInfoData.getULEB128(&DebugInfoOffset);
// Skip preceding attribute values.
for (uint32_t i = 0; i < AttrIdx; ++i) {
DWARFFormValue::skipValue(AbbrevDecl->getFormByIndex(i),
DebugInfoData, &DebugInfoOffset, U);
}
FormValue = DWARFFormValue(AbbrevDecl->getFormByIndex(AttrIdx));
return FormValue.extractValue(DebugInfoData, &DebugInfoOffset, U);
}
const char *DWARFDebugInfoEntryMinimal::getAttributeValueAsString(
const DWARFUnit *U, const uint16_t Attr, const char *FailValue) const {
DWARFFormValue FormValue;
if (!getAttributeValue(U, Attr, FormValue))
return FailValue;
Optional<const char *> Result = FormValue.getAsCString(U);
return Result.hasValue() ? Result.getValue() : FailValue;
}
uint64_t DWARFDebugInfoEntryMinimal::getAttributeValueAsAddress(
const DWARFUnit *U, const uint16_t Attr, uint64_t FailValue) const {
DWARFFormValue FormValue;
if (!getAttributeValue(U, Attr, FormValue))
return FailValue;
Optional<uint64_t> Result = FormValue.getAsAddress(U);
return Result.hasValue() ? Result.getValue() : FailValue;
}
uint64_t DWARFDebugInfoEntryMinimal::getAttributeValueAsUnsignedConstant(
const DWARFUnit *U, const uint16_t Attr, uint64_t FailValue) const {
DWARFFormValue FormValue;
if (!getAttributeValue(U, Attr, FormValue))
return FailValue;
Optional<uint64_t> Result = FormValue.getAsUnsignedConstant();
return Result.hasValue() ? Result.getValue() : FailValue;
}
uint64_t DWARFDebugInfoEntryMinimal::getAttributeValueAsReference(
const DWARFUnit *U, const uint16_t Attr, uint64_t FailValue) const {
DWARFFormValue FormValue;
if (!getAttributeValue(U, Attr, FormValue))
return FailValue;
Optional<uint64_t> Result = FormValue.getAsReference(U);
return Result.hasValue() ? Result.getValue() : FailValue;
}
uint64_t DWARFDebugInfoEntryMinimal::getAttributeValueAsSectionOffset(
const DWARFUnit *U, const uint16_t Attr, uint64_t FailValue) const {
DWARFFormValue FormValue;
if (!getAttributeValue(U, Attr, FormValue))
return FailValue;
Optional<uint64_t> Result = FormValue.getAsSectionOffset();
return Result.hasValue() ? Result.getValue() : FailValue;
}
uint64_t
DWARFDebugInfoEntryMinimal::getRangesBaseAttribute(const DWARFUnit *U,
uint64_t FailValue) const {
uint64_t Result =
getAttributeValueAsSectionOffset(U, DW_AT_ranges_base, -1ULL);
if (Result != -1ULL)
return Result;
return getAttributeValueAsSectionOffset(U, DW_AT_GNU_ranges_base, FailValue);
}
bool DWARFDebugInfoEntryMinimal::getLowAndHighPC(const DWARFUnit *U,
uint64_t &LowPC,
uint64_t &HighPC) const {
LowPC = getAttributeValueAsAddress(U, DW_AT_low_pc, -1ULL);
if (LowPC == -1ULL)
return false;
HighPC = getAttributeValueAsAddress(U, DW_AT_high_pc, -1ULL);
if (HighPC == -1ULL) {
// Since DWARF4, DW_AT_high_pc may also be of class constant, in which case
// it represents function size.
HighPC = getAttributeValueAsUnsignedConstant(U, DW_AT_high_pc, -1ULL);
if (HighPC != -1ULL)
HighPC += LowPC;
}
return (HighPC != -1ULL);
}
DWARFAddressRangesVector
DWARFDebugInfoEntryMinimal::getAddressRanges(const DWARFUnit *U) const {
if (isNULL())
return DWARFAddressRangesVector();
// Single range specified by low/high PC.
uint64_t LowPC, HighPC;
if (getLowAndHighPC(U, LowPC, HighPC)) {
return DWARFAddressRangesVector(1, std::make_pair(LowPC, HighPC));
}
// Multiple ranges from .debug_ranges section.
uint32_t RangesOffset =
getAttributeValueAsSectionOffset(U, DW_AT_ranges, -1U);
if (RangesOffset != -1U) {
DWARFDebugRangeList RangeList;
if (U->extractRangeList(RangesOffset, RangeList))
return RangeList.getAbsoluteRanges(U->getBaseAddress());
}
return DWARFAddressRangesVector();
}
void DWARFDebugInfoEntryMinimal::collectChildrenAddressRanges(
const DWARFUnit *U, DWARFAddressRangesVector& Ranges) const {
if (isNULL())
return;
if (isSubprogramDIE()) {
const auto &DIERanges = getAddressRanges(U);
Ranges.insert(Ranges.end(), DIERanges.begin(), DIERanges.end());
}
const DWARFDebugInfoEntryMinimal *Child = getFirstChild();
while (Child) {
Child->collectChildrenAddressRanges(U, Ranges);
Child = Child->getSibling();
}
}
bool DWARFDebugInfoEntryMinimal::addressRangeContainsAddress(
const DWARFUnit *U, const uint64_t Address) const {
for (const auto& R : getAddressRanges(U)) {
if (R.first <= Address && Address < R.second)
return true;
}
return false;
}
const char *
DWARFDebugInfoEntryMinimal::getSubroutineName(const DWARFUnit *U,
FunctionNameKind Kind) const {
if (!isSubroutineDIE() || Kind == FunctionNameKind::None)
return nullptr;
// Try to get mangled name only if it was asked for.
if (Kind == FunctionNameKind::LinkageName) {
if (const char *name =
getAttributeValueAsString(U, DW_AT_MIPS_linkage_name, nullptr))
return name;
if (const char *name =
getAttributeValueAsString(U, DW_AT_linkage_name, nullptr))
return name;
}
if (const char *name = getAttributeValueAsString(U, DW_AT_name, nullptr))
return name;
// Try to get name from specification DIE.
uint32_t spec_ref =
getAttributeValueAsReference(U, DW_AT_specification, -1U);
if (spec_ref != -1U) {
DWARFDebugInfoEntryMinimal spec_die;
if (spec_die.extractFast(U, &spec_ref)) {
if (const char *name = spec_die.getSubroutineName(U, Kind))
return name;
}
}
// Try to get name from abstract origin DIE.
uint32_t abs_origin_ref =
getAttributeValueAsReference(U, DW_AT_abstract_origin, -1U);
if (abs_origin_ref != -1U) {
DWARFDebugInfoEntryMinimal abs_origin_die;
if (abs_origin_die.extractFast(U, &abs_origin_ref)) {
if (const char *name = abs_origin_die.getSubroutineName(U, Kind))
return name;
}
}
return nullptr;
}
void DWARFDebugInfoEntryMinimal::getCallerFrame(const DWARFUnit *U,
uint32_t &CallFile,
uint32_t &CallLine,
uint32_t &CallColumn) const {
CallFile = getAttributeValueAsUnsignedConstant(U, DW_AT_call_file, 0);
CallLine = getAttributeValueAsUnsignedConstant(U, DW_AT_call_line, 0);
CallColumn = getAttributeValueAsUnsignedConstant(U, DW_AT_call_column, 0);
}
DWARFDebugInfoEntryInlinedChain
DWARFDebugInfoEntryMinimal::getInlinedChainForAddress(
const DWARFUnit *U, const uint64_t Address) const {
DWARFDebugInfoEntryInlinedChain InlinedChain;
InlinedChain.U = U;
if (isNULL())
return InlinedChain;
for (const DWARFDebugInfoEntryMinimal *DIE = this; DIE; ) {
// Append current DIE to inlined chain only if it has correct tag
// (e.g. it is not a lexical block).
if (DIE->isSubroutineDIE()) {
InlinedChain.DIEs.push_back(*DIE);
}
// Try to get child which also contains provided address.
const DWARFDebugInfoEntryMinimal *Child = DIE->getFirstChild();
while (Child) {
if (Child->addressRangeContainsAddress(U, Address)) {
// Assume there is only one such child.
break;
}
Child = Child->getSibling();
}
DIE = Child;
}
// Reverse the obtained chain to make the root of inlined chain last.
std::reverse(InlinedChain.DIEs.begin(), InlinedChain.DIEs.end());
return InlinedChain;
}
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