diff options
Diffstat (limited to 'contrib/llvm/lib/DebugInfo/DWARFDebugInfoEntry.cpp')
| -rw-r--r-- | contrib/llvm/lib/DebugInfo/DWARFDebugInfoEntry.cpp | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/contrib/llvm/lib/DebugInfo/DWARFDebugInfoEntry.cpp b/contrib/llvm/lib/DebugInfo/DWARFDebugInfoEntry.cpp new file mode 100644 index 0000000..babfd2e --- /dev/null +++ b/contrib/llvm/lib/DebugInfo/DWARFDebugInfoEntry.cpp @@ -0,0 +1,340 @@ +//===-- 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; + +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. + const uint32_t numAttributes = AbbrevDecl->getNumAttributes(); + for (uint32_t i = 0; i != numAttributes; ++i) { + uint16_t attr = AbbrevDecl->getAttrByIndex(i); + uint16_t form = AbbrevDecl->getFormByIndex(i); + dumpAttribute(OS, u, &offset, attr, 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 = NULL; + return true; + } + AbbrevDecl = U->getAbbreviations()->getAbbreviationDeclaration(AbbrCode); + if (0 == 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 (uint32_t i = 0, n = AbbrevDecl->getNumAttributes(); i < n; ++i) { + uint16_t Form = AbbrevDecl->getFormByIndex(i); + + 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; +} + +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); +} + +void DWARFDebugInfoEntryMinimal::buildAddressRangeTable( + const DWARFUnit *U, DWARFDebugAranges *DebugAranges, + uint32_t UOffsetInAranges) const { + if (AbbrevDecl) { + if (isSubprogramDIE()) { + uint64_t LowPC, HighPC; + if (getLowAndHighPC(U, LowPC, HighPC)) + DebugAranges->appendRange(UOffsetInAranges, LowPC, HighPC); + // FIXME: try to append ranges from .debug_ranges section. + } + + const DWARFDebugInfoEntryMinimal *Child = getFirstChild(); + while (Child) { + Child->buildAddressRangeTable(U, DebugAranges, UOffsetInAranges); + Child = Child->getSibling(); + } + } +} + +bool DWARFDebugInfoEntryMinimal::addressRangeContainsAddress( + const DWARFUnit *U, const uint64_t Address) const { + if (isNULL()) + return false; + uint64_t LowPC, HighPC; + if (getLowAndHighPC(U, LowPC, HighPC)) + return (LowPC <= Address && Address <= HighPC); + // Try to get address 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.containsAddress(U->getBaseAddress(), Address); + } + return false; +} + +const char * +DWARFDebugInfoEntryMinimal::getSubroutineName(const DWARFUnit *U) const { + if (!isSubroutineDIE()) + return 0; + // Try to get mangled name if possible. + if (const char *name = + getAttributeValueAsString(U, DW_AT_MIPS_linkage_name, 0)) + return name; + if (const char *name = getAttributeValueAsString(U, DW_AT_linkage_name, 0)) + return name; + if (const char *name = getAttributeValueAsString(U, DW_AT_name, 0)) + 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)) + 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)) + return name; + } + } + return 0; +} + +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; +} |
