mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174463 91177308-0d34-0410-b5e6-96231b3b80d8
577 lines
21 KiB
C++
577 lines
21 KiB
C++
//===-- DWARFContext.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 "DWARFContext.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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using namespace llvm;
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using namespace dwarf;
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typedef DWARFDebugLine::LineTable DWARFLineTable;
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void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) {
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if (DumpType == DIDT_All || DumpType == DIDT_Abbrev) {
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OS << ".debug_abbrev contents:\n";
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getDebugAbbrev()->dump(OS);
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}
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if (DumpType == DIDT_All || DumpType == DIDT_Info) {
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OS << "\n.debug_info contents:\n";
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for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i)
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getCompileUnitAtIndex(i)->dump(OS);
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}
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if (DumpType == DIDT_All || DumpType == DIDT_Frames) {
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OS << "\n.debug_frame contents:\n";
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getDebugFrame()->dump(OS);
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}
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uint32_t offset = 0;
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if (DumpType == DIDT_All || DumpType == DIDT_Aranges) {
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OS << "\n.debug_aranges contents:\n";
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DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
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DWARFDebugArangeSet set;
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while (set.extract(arangesData, &offset))
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set.dump(OS);
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}
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uint8_t savedAddressByteSize = 0;
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if (DumpType == DIDT_All || DumpType == DIDT_Line) {
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OS << "\n.debug_line contents:\n";
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for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i) {
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DWARFCompileUnit *cu = getCompileUnitAtIndex(i);
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savedAddressByteSize = cu->getAddressByteSize();
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unsigned stmtOffset =
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cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list,
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-1U);
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if (stmtOffset != -1U) {
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DataExtractor lineData(getLineSection(), isLittleEndian(),
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savedAddressByteSize);
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DWARFDebugLine::DumpingState state(OS);
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DWARFDebugLine::parseStatementTable(lineData, &lineRelocMap(), &stmtOffset, state);
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}
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}
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}
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if (DumpType == DIDT_All || DumpType == DIDT_Str) {
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OS << "\n.debug_str contents:\n";
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DataExtractor strData(getStringSection(), isLittleEndian(), 0);
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offset = 0;
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uint32_t strOffset = 0;
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while (const char *s = strData.getCStr(&offset)) {
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OS << format("0x%8.8x: \"%s\"\n", strOffset, s);
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strOffset = offset;
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}
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}
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if (DumpType == DIDT_All || DumpType == DIDT_Ranges) {
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OS << "\n.debug_ranges contents:\n";
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// In fact, different compile units may have different address byte
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// sizes, but for simplicity we just use the address byte size of the last
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// compile unit (there is no easy and fast way to associate address range
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// list and the compile unit it describes).
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DataExtractor rangesData(getRangeSection(), isLittleEndian(),
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savedAddressByteSize);
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offset = 0;
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DWARFDebugRangeList rangeList;
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while (rangeList.extract(rangesData, &offset))
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rangeList.dump(OS);
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}
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if (DumpType == DIDT_All || DumpType == DIDT_AbbrevDwo) {
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OS << "\n.debug_abbrev.dwo contents:\n";
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getDebugAbbrevDWO()->dump(OS);
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}
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if (DumpType == DIDT_All || DumpType == DIDT_InfoDwo) {
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OS << "\n.debug_info.dwo contents:\n";
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for (unsigned i = 0, e = getNumDWOCompileUnits(); i != e; ++i)
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getDWOCompileUnitAtIndex(i)->dump(OS);
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}
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if (DumpType == DIDT_All || DumpType == DIDT_StrDwo) {
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OS << "\n.debug_str.dwo contents:\n";
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DataExtractor strDWOData(getStringDWOSection(), isLittleEndian(), 0);
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offset = 0;
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uint32_t strDWOOffset = 0;
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while (const char *s = strDWOData.getCStr(&offset)) {
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OS << format("0x%8.8x: \"%s\"\n", strDWOOffset, s);
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strDWOOffset = offset;
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}
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}
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if (DumpType == DIDT_All || DumpType == DIDT_StrOffsetsDwo) {
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OS << "\n.debug_str_offsets.dwo contents:\n";
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DataExtractor strOffsetExt(getStringOffsetDWOSection(), isLittleEndian(), 0);
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offset = 0;
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while (offset < getStringOffsetDWOSection().size()) {
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OS << format("0x%8.8x: ", offset);
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OS << format("%8.8x\n", strOffsetExt.getU32(&offset));
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}
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}
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}
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const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
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if (Abbrev)
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return Abbrev.get();
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DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0);
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Abbrev.reset(new DWARFDebugAbbrev());
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Abbrev->parse(abbrData);
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return Abbrev.get();
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}
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const DWARFDebugAbbrev *DWARFContext::getDebugAbbrevDWO() {
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if (AbbrevDWO)
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return AbbrevDWO.get();
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DataExtractor abbrData(getAbbrevDWOSection(), isLittleEndian(), 0);
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AbbrevDWO.reset(new DWARFDebugAbbrev());
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AbbrevDWO->parse(abbrData);
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return AbbrevDWO.get();
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}
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const DWARFDebugAranges *DWARFContext::getDebugAranges() {
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if (Aranges)
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return Aranges.get();
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DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
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Aranges.reset(new DWARFDebugAranges());
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Aranges->extract(arangesData);
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// Generate aranges from DIEs: even if .debug_aranges section is present,
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// it may describe only a small subset of compilation units, so we need to
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// manually build aranges for the rest of them.
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Aranges->generate(this);
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return Aranges.get();
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}
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const DWARFDebugFrame *DWARFContext::getDebugFrame() {
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if (DebugFrame)
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return DebugFrame.get();
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// There's a "bug" in the DWARFv3 standard with respect to the target address
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// size within debug frame sections. While DWARF is supposed to be independent
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// of its container, FDEs have fields with size being "target address size",
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// which isn't specified in DWARF in general. It's only specified for CUs, but
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// .eh_frame can appear without a .debug_info section. Follow the example of
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// other tools (libdwarf) and extract this from the container (ObjectFile
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// provides this information). This problem is fixed in DWARFv4
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// See this dwarf-discuss discussion for more details:
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// http://lists.dwarfstd.org/htdig.cgi/dwarf-discuss-dwarfstd.org/2011-December/001173.html
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DataExtractor debugFrameData(getDebugFrameSection(), isLittleEndian(),
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getAddressSize());
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DebugFrame.reset(new DWARFDebugFrame());
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DebugFrame->parse(debugFrameData);
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return DebugFrame.get();
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}
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const DWARFLineTable *
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DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) {
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if (!Line)
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Line.reset(new DWARFDebugLine(&lineRelocMap()));
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unsigned stmtOffset =
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cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list,
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-1U);
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if (stmtOffset == -1U)
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return 0; // No line table for this compile unit.
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// See if the line table is cached.
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if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset))
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return lt;
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// We have to parse it first.
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DataExtractor lineData(getLineSection(), isLittleEndian(),
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cu->getAddressByteSize());
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return Line->getOrParseLineTable(lineData, stmtOffset);
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}
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void DWARFContext::parseCompileUnits() {
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uint32_t offset = 0;
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const DataExtractor &DIData = DataExtractor(getInfoSection(),
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isLittleEndian(), 0);
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while (DIData.isValidOffset(offset)) {
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CUs.push_back(DWARFCompileUnit(getDebugAbbrev(), getInfoSection(),
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getAbbrevSection(), getRangeSection(),
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getStringSection(), StringRef(),
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getAddrSection(),
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&infoRelocMap(),
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isLittleEndian()));
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if (!CUs.back().extract(DIData, &offset)) {
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CUs.pop_back();
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break;
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}
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offset = CUs.back().getNextCompileUnitOffset();
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}
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}
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void DWARFContext::parseDWOCompileUnits() {
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uint32_t offset = 0;
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const DataExtractor &DIData = DataExtractor(getInfoDWOSection(),
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isLittleEndian(), 0);
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while (DIData.isValidOffset(offset)) {
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DWOCUs.push_back(DWARFCompileUnit(getDebugAbbrevDWO(), getInfoDWOSection(),
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getAbbrevDWOSection(),
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getRangeDWOSection(),
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getStringDWOSection(),
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getStringOffsetDWOSection(),
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getAddrSection(),
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&infoDWORelocMap(),
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isLittleEndian()));
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if (!DWOCUs.back().extract(DIData, &offset)) {
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DWOCUs.pop_back();
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break;
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}
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offset = DWOCUs.back().getNextCompileUnitOffset();
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}
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}
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namespace {
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struct OffsetComparator {
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bool operator()(const DWARFCompileUnit &LHS,
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const DWARFCompileUnit &RHS) const {
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return LHS.getOffset() < RHS.getOffset();
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}
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bool operator()(const DWARFCompileUnit &LHS, uint32_t RHS) const {
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return LHS.getOffset() < RHS;
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}
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bool operator()(uint32_t LHS, const DWARFCompileUnit &RHS) const {
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return LHS < RHS.getOffset();
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}
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};
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}
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DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t Offset) {
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if (CUs.empty())
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parseCompileUnits();
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DWARFCompileUnit *CU = std::lower_bound(CUs.begin(), CUs.end(), Offset,
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OffsetComparator());
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if (CU != CUs.end())
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return &*CU;
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return 0;
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}
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DWARFCompileUnit *DWARFContext::getCompileUnitForAddress(uint64_t Address) {
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// First, get the offset of the compile unit.
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uint32_t CUOffset = getDebugAranges()->findAddress(Address);
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// Retrieve the compile unit.
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return getCompileUnitForOffset(CUOffset);
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}
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static bool getFileNameForCompileUnit(DWARFCompileUnit *CU,
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const DWARFLineTable *LineTable,
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uint64_t FileIndex,
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bool NeedsAbsoluteFilePath,
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std::string &FileName) {
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if (CU == 0 ||
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LineTable == 0 ||
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!LineTable->getFileNameByIndex(FileIndex, NeedsAbsoluteFilePath,
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FileName))
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return false;
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if (NeedsAbsoluteFilePath && sys::path::is_relative(FileName)) {
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// We may still need to append compilation directory of compile unit.
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SmallString<16> AbsolutePath;
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if (const char *CompilationDir = CU->getCompilationDir()) {
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sys::path::append(AbsolutePath, CompilationDir);
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}
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sys::path::append(AbsolutePath, FileName);
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FileName = AbsolutePath.str();
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}
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return true;
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}
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static bool getFileLineInfoForCompileUnit(DWARFCompileUnit *CU,
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const DWARFLineTable *LineTable,
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uint64_t Address,
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bool NeedsAbsoluteFilePath,
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std::string &FileName,
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uint32_t &Line, uint32_t &Column) {
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if (CU == 0 || LineTable == 0)
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return false;
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// Get the index of row we're looking for in the line table.
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uint32_t RowIndex = LineTable->lookupAddress(Address);
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if (RowIndex == -1U)
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return false;
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// Take file number and line/column from the row.
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const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
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if (!getFileNameForCompileUnit(CU, LineTable, Row.File,
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NeedsAbsoluteFilePath, FileName))
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return false;
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Line = Row.Line;
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Column = Row.Column;
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return true;
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}
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DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address,
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DILineInfoSpecifier Specifier) {
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DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
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if (!CU)
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return DILineInfo();
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std::string FileName = "<invalid>";
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std::string FunctionName = "<invalid>";
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uint32_t Line = 0;
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uint32_t Column = 0;
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if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
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// The address may correspond to instruction in some inlined function,
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// so we have to build the chain of inlined functions and take the
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// name of the topmost function in it.
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const DWARFDebugInfoEntryMinimal::InlinedChain &InlinedChain =
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CU->getInlinedChainForAddress(Address);
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if (InlinedChain.size() > 0) {
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const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain[0];
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if (const char *Name = TopFunctionDIE.getSubroutineName(CU))
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FunctionName = Name;
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}
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}
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if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
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const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
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const bool NeedsAbsoluteFilePath =
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Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
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getFileLineInfoForCompileUnit(CU, LineTable, Address,
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NeedsAbsoluteFilePath,
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FileName, Line, Column);
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}
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return DILineInfo(StringRef(FileName), StringRef(FunctionName),
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Line, Column);
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}
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DILineInfoTable DWARFContext::getLineInfoForAddressRange(uint64_t Address,
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uint64_t Size,
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DILineInfoSpecifier Specifier) {
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DILineInfoTable Lines;
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DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
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if (!CU)
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return Lines;
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std::string FunctionName = "<invalid>";
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if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
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// The address may correspond to instruction in some inlined function,
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// so we have to build the chain of inlined functions and take the
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// name of the topmost function in it.
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const DWARFDebugInfoEntryMinimal::InlinedChain &InlinedChain =
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CU->getInlinedChainForAddress(Address);
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if (InlinedChain.size() > 0) {
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const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain[0];
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if (const char *Name = TopFunctionDIE.getSubroutineName(CU))
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FunctionName = Name;
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}
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}
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StringRef FuncNameRef = StringRef(FunctionName);
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// If the Specifier says we don't need FileLineInfo, just
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// return the top-most function at the starting address.
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if (!Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
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Lines.push_back(std::make_pair(Address,
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DILineInfo(StringRef("<invalid>"),
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FuncNameRef, 0, 0)));
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return Lines;
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}
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const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
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const bool NeedsAbsoluteFilePath =
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Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
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// Get the index of row we're looking for in the line table.
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std::vector<uint32_t> RowVector;
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if (!LineTable->lookupAddressRange(Address, Size, RowVector))
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return Lines;
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uint32_t NumRows = RowVector.size();
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for (uint32_t i = 0; i < NumRows; ++i) {
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uint32_t RowIndex = RowVector[i];
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// Take file number and line/column from the row.
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const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
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std::string FileName = "<invalid>";
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getFileNameForCompileUnit(CU, LineTable, Row.File,
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NeedsAbsoluteFilePath, FileName);
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Lines.push_back(std::make_pair(Row.Address,
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DILineInfo(StringRef(FileName),
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FuncNameRef, Row.Line, Row.Column)));
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}
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return Lines;
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}
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DIInliningInfo DWARFContext::getInliningInfoForAddress(uint64_t Address,
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DILineInfoSpecifier Specifier) {
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DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
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if (!CU)
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return DIInliningInfo();
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const DWARFDebugInfoEntryMinimal::InlinedChain &InlinedChain =
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CU->getInlinedChainForAddress(Address);
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if (InlinedChain.size() == 0)
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return DIInliningInfo();
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DIInliningInfo InliningInfo;
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uint32_t CallFile = 0, CallLine = 0, CallColumn = 0;
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const DWARFLineTable *LineTable = 0;
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for (uint32_t i = 0, n = InlinedChain.size(); i != n; i++) {
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const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain[i];
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std::string FileName = "<invalid>";
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std::string FunctionName = "<invalid>";
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uint32_t Line = 0;
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uint32_t Column = 0;
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// Get function name if necessary.
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if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
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if (const char *Name = FunctionDIE.getSubroutineName(CU))
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FunctionName = Name;
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}
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if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
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const bool NeedsAbsoluteFilePath =
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Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
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if (i == 0) {
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// For the topmost frame, initialize the line table of this
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// compile unit and fetch file/line info from it.
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LineTable = getLineTableForCompileUnit(CU);
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// For the topmost routine, get file/line info from line table.
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getFileLineInfoForCompileUnit(CU, LineTable, Address,
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NeedsAbsoluteFilePath,
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FileName, Line, Column);
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} else {
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// Otherwise, use call file, call line and call column from
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// previous DIE in inlined chain.
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getFileNameForCompileUnit(CU, LineTable, CallFile,
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NeedsAbsoluteFilePath, FileName);
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Line = CallLine;
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Column = CallColumn;
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}
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// Get call file/line/column of a current DIE.
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if (i + 1 < n) {
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FunctionDIE.getCallerFrame(CU, CallFile, CallLine, CallColumn);
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}
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}
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DILineInfo Frame(StringRef(FileName), StringRef(FunctionName),
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Line, Column);
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InliningInfo.addFrame(Frame);
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}
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return InliningInfo;
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}
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DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
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IsLittleEndian(Obj->isLittleEndian()),
|
|
AddressSize(Obj->getBytesInAddress()) {
|
|
error_code ec;
|
|
for (object::section_iterator i = Obj->begin_sections(),
|
|
e = Obj->end_sections();
|
|
i != e; i.increment(ec)) {
|
|
StringRef name;
|
|
i->getName(name);
|
|
StringRef data;
|
|
i->getContents(data);
|
|
|
|
name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
|
|
if (name == "debug_info")
|
|
InfoSection = data;
|
|
else if (name == "debug_abbrev")
|
|
AbbrevSection = data;
|
|
else if (name == "debug_line")
|
|
LineSection = data;
|
|
else if (name == "debug_aranges")
|
|
ARangeSection = data;
|
|
else if (name == "debug_frame")
|
|
DebugFrameSection = data;
|
|
else if (name == "debug_str")
|
|
StringSection = data;
|
|
else if (name == "debug_ranges") {
|
|
// FIXME: Use the other dwo range section when we emit it.
|
|
RangeDWOSection = data;
|
|
RangeSection = data;
|
|
}
|
|
else if (name == "debug_info.dwo")
|
|
InfoDWOSection = data;
|
|
else if (name == "debug_abbrev.dwo")
|
|
AbbrevDWOSection = data;
|
|
else if (name == "debug_str.dwo")
|
|
StringDWOSection = data;
|
|
else if (name == "debug_str_offsets.dwo")
|
|
StringOffsetDWOSection = data;
|
|
else if (name == "debug_addr")
|
|
AddrSection = data;
|
|
// Any more debug info sections go here.
|
|
else
|
|
continue;
|
|
|
|
// TODO: Add support for relocations in other sections as needed.
|
|
// Record relocations for the debug_info and debug_line sections.
|
|
RelocAddrMap *Map;
|
|
if (name == "debug_info")
|
|
Map = &InfoRelocMap;
|
|
else if (name == "debug_info.dwo")
|
|
Map = &InfoDWORelocMap;
|
|
else if (name == "debug_line")
|
|
Map = &LineRelocMap;
|
|
else
|
|
continue;
|
|
|
|
if (i->begin_relocations() != i->end_relocations()) {
|
|
uint64_t SectionSize;
|
|
i->getSize(SectionSize);
|
|
for (object::relocation_iterator reloc_i = i->begin_relocations(),
|
|
reloc_e = i->end_relocations();
|
|
reloc_i != reloc_e; reloc_i.increment(ec)) {
|
|
uint64_t Address;
|
|
reloc_i->getAddress(Address);
|
|
uint64_t Type;
|
|
reloc_i->getType(Type);
|
|
uint64_t SymAddr = 0;
|
|
// ELF relocations may need the symbol address
|
|
if (Obj->isELF()) {
|
|
object::SymbolRef Sym;
|
|
reloc_i->getSymbol(Sym);
|
|
Sym.getAddress(SymAddr);
|
|
}
|
|
|
|
object::RelocVisitor V(Obj->getFileFormatName());
|
|
// The section address is always 0 for debug sections.
|
|
object::RelocToApply R(V.visit(Type, *reloc_i, 0, SymAddr));
|
|
if (V.error()) {
|
|
SmallString<32> Name;
|
|
error_code ec(reloc_i->getTypeName(Name));
|
|
if (ec) {
|
|
errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n";
|
|
}
|
|
errs() << "error: failed to compute relocation: "
|
|
<< Name << "\n";
|
|
continue;
|
|
}
|
|
|
|
if (Address + R.Width > SectionSize) {
|
|
errs() << "error: " << R.Width << "-byte relocation starting "
|
|
<< Address << " bytes into section " << name << " which is "
|
|
<< SectionSize << " bytes long.\n";
|
|
continue;
|
|
}
|
|
if (R.Width > 8) {
|
|
errs() << "error: can't handle a relocation of more than 8 bytes at "
|
|
"a time.\n";
|
|
continue;
|
|
}
|
|
DEBUG(dbgs() << "Writing " << format("%p", R.Value)
|
|
<< " at " << format("%p", Address)
|
|
<< " with width " << format("%d", R.Width)
|
|
<< "\n");
|
|
Map->insert(std::make_pair(Address, std::make_pair(R.Width, R.Value)));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void DWARFContextInMemory::anchor() { }
|