| //===-- DWARFContext.cpp --------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "DWARFContext.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "llvm/Support/Dwarf.h" |
| #include "llvm/Support/Format.h" |
| #include "llvm/Support/Path.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <algorithm> |
| using namespace llvm; |
| using namespace dwarf; |
| |
| typedef DWARFDebugLine::LineTable DWARFLineTable; |
| |
| void DWARFContext::dump(raw_ostream &OS) { |
| OS << ".debug_abbrev contents:\n"; |
| getDebugAbbrev()->dump(OS); |
| |
| OS << "\n.debug_info contents:\n"; |
| for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i) |
| getCompileUnitAtIndex(i)->dump(OS); |
| |
| OS << "\n.debug_aranges contents:\n"; |
| DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0); |
| uint32_t offset = 0; |
| DWARFDebugArangeSet set; |
| while (set.extract(arangesData, &offset)) |
| set.dump(OS); |
| |
| uint8_t savedAddressByteSize = 0; |
| OS << "\n.debug_lines contents:\n"; |
| for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i) { |
| DWARFCompileUnit *cu = getCompileUnitAtIndex(i); |
| savedAddressByteSize = cu->getAddressByteSize(); |
| unsigned stmtOffset = |
| cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list, |
| -1U); |
| if (stmtOffset != -1U) { |
| DataExtractor lineData(getLineSection(), isLittleEndian(), |
| savedAddressByteSize); |
| DWARFDebugLine::DumpingState state(OS); |
| DWARFDebugLine::parseStatementTable(lineData, &stmtOffset, state); |
| } |
| } |
| |
| OS << "\n.debug_str contents:\n"; |
| DataExtractor strData(getStringSection(), isLittleEndian(), 0); |
| offset = 0; |
| uint32_t lastOffset = 0; |
| while (const char *s = strData.getCStr(&offset)) { |
| OS << format("0x%8.8x: \"%s\"\n", lastOffset, s); |
| lastOffset = offset; |
| } |
| |
| OS << "\n.debug_ranges contents:\n"; |
| // In fact, different compile units may have different address byte |
| // sizes, but for simplicity we just use the address byte size of the last |
| // compile unit (there is no easy and fast way to associate address range |
| // list and the compile unit it describes). |
| DataExtractor rangesData(getRangeSection(), isLittleEndian(), |
| savedAddressByteSize); |
| offset = 0; |
| DWARFDebugRangeList rangeList; |
| while (rangeList.extract(rangesData, &offset)) |
| rangeList.dump(OS); |
| } |
| |
| const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() { |
| if (Abbrev) |
| return Abbrev.get(); |
| |
| DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0); |
| |
| Abbrev.reset(new DWARFDebugAbbrev()); |
| Abbrev->parse(abbrData); |
| return Abbrev.get(); |
| } |
| |
| const DWARFDebugAranges *DWARFContext::getDebugAranges() { |
| if (Aranges) |
| return Aranges.get(); |
| |
| DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0); |
| |
| Aranges.reset(new DWARFDebugAranges()); |
| Aranges->extract(arangesData); |
| if (Aranges->isEmpty()) // No aranges in file, generate them from the DIEs. |
| Aranges->generate(this); |
| return Aranges.get(); |
| } |
| |
| const DWARFLineTable * |
| DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) { |
| if (!Line) |
| Line.reset(new DWARFDebugLine()); |
| |
| unsigned stmtOffset = |
| cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list, |
| -1U); |
| if (stmtOffset == -1U) |
| return 0; // No line table for this compile unit. |
| |
| // See if the line table is cached. |
| if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset)) |
| return lt; |
| |
| // We have to parse it first. |
| DataExtractor lineData(getLineSection(), isLittleEndian(), |
| cu->getAddressByteSize()); |
| return Line->getOrParseLineTable(lineData, stmtOffset); |
| } |
| |
| void DWARFContext::parseCompileUnits() { |
| uint32_t offset = 0; |
| const DataExtractor &DIData = DataExtractor(getInfoSection(), |
| isLittleEndian(), 0); |
| while (DIData.isValidOffset(offset)) { |
| CUs.push_back(DWARFCompileUnit(*this)); |
| if (!CUs.back().extract(DIData, &offset)) { |
| CUs.pop_back(); |
| break; |
| } |
| |
| offset = CUs.back().getNextCompileUnitOffset(); |
| } |
| } |
| |
| namespace { |
| struct OffsetComparator { |
| bool operator()(const DWARFCompileUnit &LHS, |
| const DWARFCompileUnit &RHS) const { |
| return LHS.getOffset() < RHS.getOffset(); |
| } |
| bool operator()(const DWARFCompileUnit &LHS, uint32_t RHS) const { |
| return LHS.getOffset() < RHS; |
| } |
| bool operator()(uint32_t LHS, const DWARFCompileUnit &RHS) const { |
| return LHS < RHS.getOffset(); |
| } |
| }; |
| } |
| |
| DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t Offset) { |
| if (CUs.empty()) |
| parseCompileUnits(); |
| |
| DWARFCompileUnit *CU = std::lower_bound(CUs.begin(), CUs.end(), Offset, |
| OffsetComparator()); |
| if (CU != CUs.end()) |
| return &*CU; |
| return 0; |
| } |
| |
| DWARFCompileUnit *DWARFContext::getCompileUnitForAddress(uint64_t Address) { |
| // First, get the offset of the compile unit. |
| uint32_t CUOffset = getDebugAranges()->findAddress(Address); |
| // Retrieve the compile unit. |
| return getCompileUnitForOffset(CUOffset); |
| } |
| |
| static bool getFileNameForCompileUnit(DWARFCompileUnit *CU, |
| const DWARFLineTable *LineTable, |
| uint64_t FileIndex, |
| bool NeedsAbsoluteFilePath, |
| std::string &FileName) { |
| if (CU == 0 || |
| LineTable == 0 || |
| !LineTable->getFileNameByIndex(FileIndex, NeedsAbsoluteFilePath, |
| FileName)) |
| return false; |
| if (NeedsAbsoluteFilePath && sys::path::is_relative(FileName)) { |
| // We may still need to append compilation directory of compile unit. |
| SmallString<16> AbsolutePath; |
| if (const char *CompilationDir = CU->getCompilationDir()) { |
| sys::path::append(AbsolutePath, CompilationDir); |
| } |
| sys::path::append(AbsolutePath, FileName); |
| FileName = AbsolutePath.str(); |
| } |
| return true; |
| } |
| |
| static bool getFileLineInfoForCompileUnit(DWARFCompileUnit *CU, |
| const DWARFLineTable *LineTable, |
| uint64_t Address, |
| bool NeedsAbsoluteFilePath, |
| std::string &FileName, |
| uint32_t &Line, uint32_t &Column) { |
| if (CU == 0 || LineTable == 0) |
| return false; |
| // Get the index of row we're looking for in the line table. |
| uint32_t RowIndex = LineTable->lookupAddress(Address); |
| if (RowIndex == -1U) |
| return false; |
| // Take file number and line/column from the row. |
| const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex]; |
| if (!getFileNameForCompileUnit(CU, LineTable, Row.File, |
| NeedsAbsoluteFilePath, FileName)) |
| return false; |
| Line = Row.Line; |
| Column = Row.Column; |
| return true; |
| } |
| |
| DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address, |
| DILineInfoSpecifier Specifier) { |
| DWARFCompileUnit *CU = getCompileUnitForAddress(Address); |
| if (!CU) |
| return DILineInfo(); |
| std::string FileName = "<invalid>"; |
| std::string FunctionName = "<invalid>"; |
| uint32_t Line = 0; |
| uint32_t Column = 0; |
| if (Specifier.needs(DILineInfoSpecifier::FunctionName)) { |
| // The address may correspond to instruction in some inlined function, |
| // so we have to build the chain of inlined functions and take the |
| // name of the topmost function in it. |
| const DWARFDebugInfoEntryMinimal::InlinedChain &InlinedChain = |
| CU->getInlinedChainForAddress(Address); |
| if (InlinedChain.size() > 0) { |
| const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain[0]; |
| if (const char *Name = TopFunctionDIE.getSubroutineName(CU)) |
| FunctionName = Name; |
| } |
| } |
| if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) { |
| const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU); |
| const bool NeedsAbsoluteFilePath = |
| Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath); |
| getFileLineInfoForCompileUnit(CU, LineTable, Address, |
| NeedsAbsoluteFilePath, |
| FileName, Line, Column); |
| } |
| return DILineInfo(StringRef(FileName), StringRef(FunctionName), |
| Line, Column); |
| } |
| |
| DIInliningInfo DWARFContext::getInliningInfoForAddress(uint64_t Address, |
| DILineInfoSpecifier Specifier) { |
| DWARFCompileUnit *CU = getCompileUnitForAddress(Address); |
| if (!CU) |
| return DIInliningInfo(); |
| |
| const DWARFDebugInfoEntryMinimal::InlinedChain &InlinedChain = |
| CU->getInlinedChainForAddress(Address); |
| if (InlinedChain.size() == 0) |
| return DIInliningInfo(); |
| |
| DIInliningInfo InliningInfo; |
| uint32_t CallFile = 0, CallLine = 0, CallColumn = 0; |
| const DWARFLineTable *LineTable = 0; |
| for (uint32_t i = 0, n = InlinedChain.size(); i != n; i++) { |
| const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain[i]; |
| std::string FileName = "<invalid>"; |
| std::string FunctionName = "<invalid>"; |
| uint32_t Line = 0; |
| uint32_t Column = 0; |
| // Get function name if necessary. |
| if (Specifier.needs(DILineInfoSpecifier::FunctionName)) { |
| if (const char *Name = FunctionDIE.getSubroutineName(CU)) |
| FunctionName = Name; |
| } |
| if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) { |
| const bool NeedsAbsoluteFilePath = |
| Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath); |
| if (i == 0) { |
| // For the topmost frame, initialize the line table of this |
| // compile unit and fetch file/line info from it. |
| LineTable = getLineTableForCompileUnit(CU); |
| // For the topmost routine, get file/line info from line table. |
| getFileLineInfoForCompileUnit(CU, LineTable, Address, |
| NeedsAbsoluteFilePath, |
| FileName, Line, Column); |
| } else { |
| // Otherwise, use call file, call line and call column from |
| // previous DIE in inlined chain. |
| getFileNameForCompileUnit(CU, LineTable, CallFile, |
| NeedsAbsoluteFilePath, FileName); |
| Line = CallLine; |
| Column = CallColumn; |
| } |
| // Get call file/line/column of a current DIE. |
| if (i + 1 < n) { |
| FunctionDIE.getCallerFrame(CU, CallFile, CallLine, CallColumn); |
| } |
| } |
| DILineInfo Frame(StringRef(FileName), StringRef(FunctionName), |
| Line, Column); |
| InliningInfo.addFrame(Frame); |
| } |
| return InliningInfo; |
| } |
| |
| void DWARFContextInMemory::anchor() { } |