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77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
//===-- DWARFDebugLoc.cpp -------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "DWARFDebugLoc.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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void DWARFDebugLoc::dump(raw_ostream &OS) const {
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for (const LocationList &L : Locations) {
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OS << format("0x%8.8x: ", L.Offset);
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const unsigned Indent = 12;
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for (const Entry &E : L.Entries) {
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if (&E != L.Entries.begin())
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OS.indent(Indent);
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OS << "Beginning address offset: " << format("0x%016" PRIx64, E.Begin)
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<< '\n';
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OS.indent(Indent) << " Ending address offset: "
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<< format("0x%016" PRIx64, E.End) << '\n';
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OS.indent(Indent) << " Location description: ";
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for (unsigned char Loc : E.Loc) {
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OS << format("%2.2x ", Loc);
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}
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OS << "\n\n";
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}
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}
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}
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void DWARFDebugLoc::parse(DataExtractor data, unsigned AddressSize) {
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uint32_t Offset = 0;
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while (data.isValidOffset(Offset+AddressSize-1)) {
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Locations.resize(Locations.size() + 1);
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LocationList &Loc = Locations.back();
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Loc.Offset = Offset;
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// 2.6.2 Location Lists
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// A location list entry consists of:
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while (true) {
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Entry E;
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RelocAddrMap::const_iterator AI = RelocMap.find(Offset);
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// 1. A beginning address offset. ...
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E.Begin = data.getUnsigned(&Offset, AddressSize);
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if (AI != RelocMap.end())
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E.Begin += AI->second.second;
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AI = RelocMap.find(Offset);
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// 2. An ending address offset. ...
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E.End = data.getUnsigned(&Offset, AddressSize);
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if (AI != RelocMap.end())
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E.End += AI->second.second;
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// The end of any given location list is marked by an end of list entry,
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// which consists of a 0 for the beginning address offset and a 0 for the
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// ending address offset.
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if (E.Begin == 0 && E.End == 0)
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break;
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unsigned Bytes = data.getU16(&Offset);
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// A single location description describing the location of the object...
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StringRef str = data.getData().substr(Offset, Bytes);
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Offset += Bytes;
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E.Loc.reserve(str.size());
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std::copy(str.begin(), str.end(), std::back_inserter(E.Loc));
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Loc.Entries.push_back(std::move(E));
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}
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}
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if (data.isValidOffset(Offset))
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llvm::errs() << "error: failed to consume entire .debug_loc section\n";
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}
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