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llvm-project/llvm/lib/DebugInfo/DWARFContext.cpp

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//===-- 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_line 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);
// Generate aranges from DIEs: even if .debug_aranges section is present,
// it may describe only a small subset of compilation units, so we need to
// manually build aranges for the rest of them.
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;
}
DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
IsLittleEndian(true /* FIXME */) {
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);
if (name.startswith("__DWARF,"))
name = name.substr(8); // Skip "__DWARF," prefix.
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_str")
StringSection = data;
else if (name == "debug_ranges")
RangeSection = data;
// Any more debug info sections go here.
else
continue;
// TODO: For now only handle relocations for the debug_info section.
if (name != "debug_info")
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);
object::RelocVisitor V(Obj->getFileFormatName());
// The section address is always 0 for debug sections.
object::RelocToApply R(V.visit(Type, *reloc_i));
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");
RelocMap[Address] = std::make_pair(R.Width, R.Value);
}
}
}
}
void DWARFContextInMemory::anchor() { }
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