#include "DWARFCompileUnit.h"
#include "DWARFContext.h"
-#include "DWARFFormValue.h"
+#include "llvm/DebugInfo/DWARFFormValue.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/Format.h"
+#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace dwarf;
-DataExtractor DWARFCompileUnit::getDebugInfoExtractor() const {
- return DataExtractor(Context.getInfoSection(),
- Context.isLittleEndian(), getAddressByteSize());
+bool DWARFCompileUnit::getAddrOffsetSectionItem(uint32_t Index,
+ uint64_t &Result) const {
+ uint32_t Offset = AddrOffsetSectionBase + Index * AddrSize;
+ if (AddrOffsetSection.size() < Offset + AddrSize)
+ return false;
+ DataExtractor DA(AddrOffsetSection, isLittleEndian, AddrSize);
+ Result = DA.getAddress(&Offset);
+ return true;
+}
+
+bool DWARFCompileUnit::getStringOffsetSectionItem(uint32_t Index,
+ uint32_t &Result) const {
+ // FIXME: string offset section entries are 8-byte for DWARF64.
+ const uint32_t ItemSize = 4;
+ uint32_t Offset = Index * ItemSize;
+ if (StringOffsetSection.size() < Offset + ItemSize)
+ return false;
+ DataExtractor DA(StringOffsetSection, isLittleEndian, 0);
+ Result = DA.getU32(&Offset);
+ return true;
}
bool DWARFCompileUnit::extract(DataExtractor debug_info, uint32_t *offset_ptr) {
if (debug_info.isValidOffset(*offset_ptr)) {
uint64_t abbrOffset;
- const DWARFDebugAbbrev *abbr = Context.getDebugAbbrev();
Length = debug_info.getU32(offset_ptr);
Version = debug_info.getU16(offset_ptr);
abbrOffset = debug_info.getU32(offset_ptr);
bool lengthOK = debug_info.isValidOffset(getNextCompileUnitOffset()-1);
bool versionOK = DWARFContext::isSupportedVersion(Version);
- bool abbrOffsetOK = Context.getAbbrevSection().size() > abbrOffset;
+ bool abbrOffsetOK = AbbrevSection.size() > abbrOffset;
bool addrSizeOK = AddrSize == 4 || AddrSize == 8;
- if (lengthOK && versionOK && addrSizeOK && abbrOffsetOK && abbr != NULL) {
- Abbrevs = abbr->getAbbreviationDeclarationSet(abbrOffset);
+ if (lengthOK && versionOK && addrSizeOK && abbrOffsetOK && Abbrev != NULL) {
+ Abbrevs = Abbrev->getAbbreviationDeclarationSet(abbrOffset);
return true;
}
Version = debug_info_data.getU16(&offset);
bool abbrevsOK = debug_info_data.getU32(&offset) == abbrevs->getOffset();
Abbrevs = abbrevs;
- AddrSize = debug_info_data.getU8 (&offset);
+ AddrSize = debug_info_data.getU8(&offset);
bool versionOK = DWARFContext::isSupportedVersion(Version);
bool addrSizeOK = AddrSize == 4 || AddrSize == 8;
return 0;
}
+bool DWARFCompileUnit::extractRangeList(uint32_t RangeListOffset,
+ DWARFDebugRangeList &RangeList) const {
+ // Require that compile unit is extracted.
+ assert(DieArray.size() > 0);
+ DataExtractor RangesData(RangeSection, isLittleEndian, AddrSize);
+ uint32_t ActualRangeListOffset = RangeSectionBase + RangeListOffset;
+ return RangeList.extract(RangesData, &ActualRangeListOffset);
+}
+
void DWARFCompileUnit::clear() {
Offset = 0;
Length = 0;
Abbrevs = 0;
AddrSize = 0;
BaseAddr = 0;
+ RangeSectionBase = 0;
+ AddrOffsetSectionBase = 0;
clearDIEs(false);
+ DWO.reset();
}
void DWARFCompileUnit::dump(raw_ostream &OS) {
return DieArray[0].getAttributeValueAsString(this, DW_AT_comp_dir, 0);
}
+uint64_t DWARFCompileUnit::getDWOId() {
+ extractDIEsIfNeeded(true);
+ const uint64_t FailValue = -1ULL;
+ if (DieArray.empty())
+ return FailValue;
+ return DieArray[0]
+ .getAttributeValueAsUnsigned(this, DW_AT_GNU_dwo_id, FailValue);
+}
+
void DWARFCompileUnit::setDIERelations() {
if (DieArray.empty())
return;
curr_die->setParent(die_array_begin);
}
-size_t DWARFCompileUnit::extractDIEsIfNeeded(bool cu_die_only) {
- const size_t initial_die_array_size = DieArray.size();
- if ((cu_die_only && initial_die_array_size > 0) ||
- initial_die_array_size > 1)
- return 0; // Already parsed
+void DWARFCompileUnit::extractDIEsToVector(
+ bool AppendCUDie, bool AppendNonCUDies,
+ std::vector<DWARFDebugInfoEntryMinimal> &Dies) const {
+ if (!AppendCUDie && !AppendNonCUDies)
+ return;
// Set the offset to that of the first DIE and calculate the start of the
// next compilation unit header.
- uint32_t offset = getFirstDIEOffset();
- uint32_t next_cu_offset = getNextCompileUnitOffset();
-
- DWARFDebugInfoEntryMinimal die;
- // Keep a flat array of the DIE for binary lookup by DIE offset
- uint32_t depth = 0;
- // We are in our compile unit, parse starting at the offset
- // we were told to parse
-
- const uint8_t *fixed_form_sizes =
- DWARFFormValue::getFixedFormSizesForAddressSize(getAddressByteSize());
-
- while (offset < next_cu_offset &&
- die.extractFast(this, fixed_form_sizes, &offset)) {
-
- if (depth == 0) {
- uint64_t base_addr =
- die.getAttributeValueAsUnsigned(this, DW_AT_low_pc, -1U);
- if (base_addr == -1U)
- base_addr = die.getAttributeValueAsUnsigned(this, DW_AT_entry_pc, 0);
- setBaseAddress(base_addr);
- }
-
- if (cu_die_only) {
- addDIE(die);
- return 1;
- }
- else if (depth == 0 && initial_die_array_size == 1) {
- // Don't append the CU die as we already did that
+ uint32_t Offset = getFirstDIEOffset();
+ uint32_t NextCUOffset = getNextCompileUnitOffset();
+ DWARFDebugInfoEntryMinimal DIE;
+ uint32_t Depth = 0;
+ const uint8_t *FixedFormSizes =
+ DWARFFormValue::getFixedFormSizes(getAddressByteSize(), getVersion());
+ bool IsCUDie = true;
+
+ while (Offset < NextCUOffset &&
+ DIE.extractFast(this, FixedFormSizes, &Offset)) {
+ if (IsCUDie) {
+ if (AppendCUDie)
+ Dies.push_back(DIE);
+ if (!AppendNonCUDies)
+ break;
+ // The average bytes per DIE entry has been seen to be
+ // around 14-20 so let's pre-reserve the needed memory for
+ // our DIE entries accordingly.
+ Dies.reserve(Dies.size() + getDebugInfoSize() / 14);
+ IsCUDie = false;
} else {
- addDIE (die);
+ Dies.push_back(DIE);
}
- const DWARFAbbreviationDeclaration *abbrDecl =
- die.getAbbreviationDeclarationPtr();
- if (abbrDecl) {
+ const DWARFAbbreviationDeclaration *AbbrDecl =
+ DIE.getAbbreviationDeclarationPtr();
+ if (AbbrDecl) {
// Normal DIE
- if (abbrDecl->hasChildren())
- ++depth;
+ if (AbbrDecl->hasChildren())
+ ++Depth;
} else {
// NULL DIE.
- if (depth > 0)
- --depth;
- if (depth == 0)
+ if (Depth > 0)
+ --Depth;
+ if (Depth == 0)
break; // We are done with this compile unit!
}
-
}
// Give a little bit of info if we encounter corrupt DWARF (our offset
// should always terminate at or before the start of the next compilation
// unit header).
- if (offset > next_cu_offset)
- fprintf (stderr, "warning: DWARF compile unit extends beyond its"
- "bounds cu 0x%8.8x at 0x%8.8x'\n", getOffset(), offset);
+ if (Offset > NextCUOffset)
+ fprintf(stderr, "warning: DWARF compile unit extends beyond its "
+ "bounds cu 0x%8.8x at 0x%8.8x'\n", getOffset(), Offset);
+}
+
+size_t DWARFCompileUnit::extractDIEsIfNeeded(bool CUDieOnly) {
+ if ((CUDieOnly && DieArray.size() > 0) ||
+ DieArray.size() > 1)
+ return 0; // Already parsed.
+
+ bool HasCUDie = DieArray.size() > 0;
+ extractDIEsToVector(!HasCUDie, !CUDieOnly, DieArray);
+
+ if (DieArray.empty())
+ return 0;
+
+ // If CU DIE was just parsed, copy several attribute values from it.
+ if (!HasCUDie) {
+ uint64_t BaseAddr =
+ DieArray[0].getAttributeValueAsUnsigned(this, DW_AT_low_pc, -1U);
+ if (BaseAddr == -1U)
+ BaseAddr = DieArray[0].getAttributeValueAsUnsigned(this, DW_AT_entry_pc, 0);
+ setBaseAddress(BaseAddr);
+ AddrOffsetSectionBase =
+ DieArray[0].getAttributeValueAsReference(this, DW_AT_GNU_addr_base, 0);
+ RangeSectionBase =
+ DieArray[0].getAttributeValueAsReference(this, DW_AT_GNU_ranges_base, 0);
+ }
setDIERelations();
return DieArray.size();
}
-void DWARFCompileUnit::clearDIEs(bool keep_compile_unit_die) {
- if (DieArray.size() > (unsigned)keep_compile_unit_die) {
+DWARFCompileUnit::DWOHolder::DWOHolder(object::ObjectFile *DWOFile)
+ : DWOFile(DWOFile),
+ DWOContext(cast<DWARFContext>(DIContext::getDWARFContext(DWOFile))),
+ DWOCU(0) {
+ if (DWOContext->getNumDWOCompileUnits() > 0)
+ DWOCU = DWOContext->getDWOCompileUnitAtIndex(0);
+}
+
+bool DWARFCompileUnit::parseDWO() {
+ if (DWO.get() != 0)
+ return false;
+ extractDIEsIfNeeded(true);
+ if (DieArray.empty())
+ return false;
+ const char *DWOFileName =
+ DieArray[0].getAttributeValueAsString(this, DW_AT_GNU_dwo_name, 0);
+ if (DWOFileName == 0)
+ return false;
+ const char *CompilationDir =
+ DieArray[0].getAttributeValueAsString(this, DW_AT_comp_dir, 0);
+ SmallString<16> AbsolutePath;
+ if (sys::path::is_relative(DWOFileName) && CompilationDir != 0) {
+ sys::path::append(AbsolutePath, CompilationDir);
+ }
+ sys::path::append(AbsolutePath, DWOFileName);
+ object::ObjectFile *DWOFile =
+ object::ObjectFile::createObjectFile(AbsolutePath);
+ if (!DWOFile)
+ return false;
+ // Reset DWOHolder.
+ DWO.reset(new DWOHolder(DWOFile));
+ DWARFCompileUnit *DWOCU = DWO->getCU();
+ // Verify that compile unit in .dwo file is valid.
+ if (DWOCU == 0 || DWOCU->getDWOId() != getDWOId()) {
+ DWO.reset();
+ return false;
+ }
+ // Share .debug_addr and .debug_ranges section with compile unit in .dwo
+ DWOCU->setAddrOffsetSection(AddrOffsetSection, AddrOffsetSectionBase);
+ DWOCU->setRangesSection(RangeSection, RangeSectionBase);
+ return true;
+}
+
+void DWARFCompileUnit::clearDIEs(bool KeepCUDie) {
+ if (DieArray.size() > (unsigned)KeepCUDie) {
// std::vectors never get any smaller when resized to a smaller size,
// or when clear() or erase() are called, the size will report that it
// is smaller, but the memory allocated remains intact (call capacity()
// to see this). So we need to create a temporary vector and swap the
// contents which will cause just the internal pointers to be swapped
- // so that when "tmp_array" goes out of scope, it will destroy the
+ // so that when temporary vector goes out of scope, it will destroy the
// contents.
-
+ std::vector<DWARFDebugInfoEntryMinimal> TmpArray;
+ DieArray.swap(TmpArray);
// Save at least the compile unit DIE
- std::vector<DWARFDebugInfoEntryMinimal> tmpArray;
- DieArray.swap(tmpArray);
- if (keep_compile_unit_die)
- DieArray.push_back(tmpArray.front());
+ if (KeepCUDie)
+ DieArray.push_back(TmpArray.front());
}
}
void
DWARFCompileUnit::buildAddressRangeTable(DWARFDebugAranges *debug_aranges,
- bool clear_dies_if_already_not_parsed){
+ bool clear_dies_if_already_not_parsed,
+ uint32_t CUOffsetInAranges) {
// This function is usually called if there in no .debug_aranges section
// in order to produce a compile unit level set of address ranges that
// is accurate. If the DIEs weren't parsed, then we don't want all dies for
// down.
const bool clear_dies = extractDIEsIfNeeded(false) > 1 &&
clear_dies_if_already_not_parsed;
- DieArray[0].buildAddressRangeTable(this, debug_aranges);
+ DieArray[0].buildAddressRangeTable(this, debug_aranges, CUOffsetInAranges);
+ bool DWOCreated = parseDWO();
+ if (DWO.get()) {
+ // If there is a .dwo file for this compile unit, then skeleton CU DIE
+ // doesn't have children, and we should instead build address range table
+ // from DIEs in the .debug_info.dwo section of .dwo file.
+ DWO->getCU()->buildAddressRangeTable(
+ debug_aranges, clear_dies_if_already_not_parsed, CUOffsetInAranges);
+ }
+ if (DWOCreated && clear_dies_if_already_not_parsed)
+ DWO.reset();
// Keep memory down by clearing DIEs if this generate function
// caused them to be parsed.
clearDIEs(true);
}
-const DWARFDebugInfoEntryMinimal*
-DWARFCompileUnit::getFunctionDIEForAddress(int64_t address) {
+const DWARFDebugInfoEntryMinimal *
+DWARFCompileUnit::getSubprogramForAddress(uint64_t Address) {
extractDIEsIfNeeded(false);
- for (size_t i = 0, n = DieArray.size(); i != n; i++) {
- if (DieArray[i].addressRangeContainsAddress(this, address))
+ for (size_t i = 0, n = DieArray.size(); i != n; i++)
+ if (DieArray[i].isSubprogramDIE() &&
+ DieArray[i].addressRangeContainsAddress(this, Address)) {
return &DieArray[i];
- }
+ }
return 0;
}
+
+DWARFDebugInfoEntryInlinedChain
+DWARFCompileUnit::getInlinedChainForAddress(uint64_t Address) {
+ // First, find a subprogram that contains the given address (the root
+ // of inlined chain).
+ const DWARFCompileUnit *ChainCU = 0;
+ const DWARFDebugInfoEntryMinimal *SubprogramDIE =
+ getSubprogramForAddress(Address);
+ if (SubprogramDIE) {
+ ChainCU = this;
+ } else {
+ // Try to look for subprogram DIEs in the DWO file.
+ parseDWO();
+ if (DWO.get()) {
+ SubprogramDIE = DWO->getCU()->getSubprogramForAddress(Address);
+ if (SubprogramDIE)
+ ChainCU = DWO->getCU();
+ }
+ }
+
+ // Get inlined chain rooted at this subprogram DIE.
+ if (!SubprogramDIE)
+ return DWARFDebugInfoEntryInlinedChain();
+ return SubprogramDIE->getInlinedChainForAddress(ChainCU, Address);
+ }
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