1 //===-- DWARFContext.cpp --------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "DWARFContext.h"
11 #include "llvm/ADT/SmallString.h"
12 #include "llvm/Support/Dwarf.h"
13 #include "llvm/Support/Format.h"
14 #include "llvm/Support/Path.h"
15 #include "llvm/Support/raw_ostream.h"
18 using namespace dwarf;
20 typedef DWARFDebugLine::LineTable DWARFLineTable;
22 void DWARFContext::dump(raw_ostream &OS) {
23 OS << ".debug_abbrev contents:\n";
24 getDebugAbbrev()->dump(OS);
26 OS << "\n.debug_info contents:\n";
27 for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i)
28 getCompileUnitAtIndex(i)->dump(OS);
30 OS << "\n.debug_aranges contents:\n";
31 DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
33 DWARFDebugArangeSet set;
34 while (set.extract(arangesData, &offset))
37 uint8_t savedAddressByteSize = 0;
38 OS << "\n.debug_line contents:\n";
39 for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i) {
40 DWARFCompileUnit *cu = getCompileUnitAtIndex(i);
41 savedAddressByteSize = cu->getAddressByteSize();
43 cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list,
45 if (stmtOffset != -1U) {
46 DataExtractor lineData(getLineSection(), isLittleEndian(),
47 savedAddressByteSize);
48 DWARFDebugLine::DumpingState state(OS);
49 DWARFDebugLine::parseStatementTable(lineData, &stmtOffset, state);
53 OS << "\n.debug_str contents:\n";
54 DataExtractor strData(getStringSection(), isLittleEndian(), 0);
56 uint32_t strOffset = 0;
57 while (const char *s = strData.getCStr(&offset)) {
58 OS << format("0x%8.8x: \"%s\"\n", strOffset, s);
62 OS << "\n.debug_ranges contents:\n";
63 // In fact, different compile units may have different address byte
64 // sizes, but for simplicity we just use the address byte size of the last
65 // compile unit (there is no easy and fast way to associate address range
66 // list and the compile unit it describes).
67 DataExtractor rangesData(getRangeSection(), isLittleEndian(),
68 savedAddressByteSize);
70 DWARFDebugRangeList rangeList;
71 while (rangeList.extract(rangesData, &offset))
74 OS << "\n.debug_abbrev.dwo contents:\n";
75 getDebugAbbrevDWO()->dump(OS);
77 OS << "\n.debug_info.dwo contents:\n";
78 for (unsigned i = 0, e = getNumDWOCompileUnits(); i != e; ++i)
79 getDWOCompileUnitAtIndex(i)->dump(OS);
81 OS << "\n.debug_str.dwo contents:\n";
82 DataExtractor strDWOData(getStringDWOSection(), isLittleEndian(), 0);
84 uint32_t strDWOOffset = 0;
85 while (const char *s = strDWOData.getCStr(&offset)) {
86 OS << format("0x%8.8x: \"%s\"\n", strDWOOffset, s);
87 strDWOOffset = offset;
91 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
95 DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0);
97 Abbrev.reset(new DWARFDebugAbbrev());
98 Abbrev->parse(abbrData);
102 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrevDWO() {
104 return AbbrevDWO.get();
106 DataExtractor abbrData(getAbbrevDWOSection(), isLittleEndian(), 0);
107 AbbrevDWO.reset(new DWARFDebugAbbrev());
108 AbbrevDWO->parse(abbrData);
109 return AbbrevDWO.get();
112 const DWARFDebugAranges *DWARFContext::getDebugAranges() {
114 return Aranges.get();
116 DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
118 Aranges.reset(new DWARFDebugAranges());
119 Aranges->extract(arangesData);
120 // Generate aranges from DIEs: even if .debug_aranges section is present,
121 // it may describe only a small subset of compilation units, so we need to
122 // manually build aranges for the rest of them.
123 Aranges->generate(this);
124 return Aranges.get();
127 const DWARFLineTable *
128 DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) {
130 Line.reset(new DWARFDebugLine());
132 unsigned stmtOffset =
133 cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list,
135 if (stmtOffset == -1U)
136 return 0; // No line table for this compile unit.
138 // See if the line table is cached.
139 if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset))
142 // We have to parse it first.
143 DataExtractor lineData(getLineSection(), isLittleEndian(),
144 cu->getAddressByteSize());
145 return Line->getOrParseLineTable(lineData, stmtOffset);
148 void DWARFContext::parseCompileUnits() {
150 const DataExtractor &DIData = DataExtractor(getInfoSection(),
151 isLittleEndian(), 0);
152 while (DIData.isValidOffset(offset)) {
153 CUs.push_back(DWARFCompileUnit(getDebugAbbrev(), getInfoSection(),
154 getAbbrevSection(), getRangeSection(),
155 getStringSection(), "",
158 if (!CUs.back().extract(DIData, &offset)) {
163 offset = CUs.back().getNextCompileUnitOffset();
167 void DWARFContext::parseDWOCompileUnits() {
169 const DataExtractor &DIData = DataExtractor(getInfoDWOSection(),
170 isLittleEndian(), 0);
171 while (DIData.isValidOffset(offset)) {
172 DWOCUs.push_back(DWARFCompileUnit(getDebugAbbrevDWO(), getInfoDWOSection(),
173 getAbbrevDWOSection(),
174 getRangeDWOSection(),
175 getStringDWOSection(),
176 getStringOffsetDWOSection(),
179 if (!DWOCUs.back().extract(DIData, &offset)) {
184 offset = DWOCUs.back().getNextCompileUnitOffset();
189 struct OffsetComparator {
190 bool operator()(const DWARFCompileUnit &LHS,
191 const DWARFCompileUnit &RHS) const {
192 return LHS.getOffset() < RHS.getOffset();
194 bool operator()(const DWARFCompileUnit &LHS, uint32_t RHS) const {
195 return LHS.getOffset() < RHS;
197 bool operator()(uint32_t LHS, const DWARFCompileUnit &RHS) const {
198 return LHS < RHS.getOffset();
203 DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t Offset) {
207 DWARFCompileUnit *CU = std::lower_bound(CUs.begin(), CUs.end(), Offset,
214 DWARFCompileUnit *DWARFContext::getCompileUnitForAddress(uint64_t Address) {
215 // First, get the offset of the compile unit.
216 uint32_t CUOffset = getDebugAranges()->findAddress(Address);
217 // Retrieve the compile unit.
218 return getCompileUnitForOffset(CUOffset);
221 static bool getFileNameForCompileUnit(DWARFCompileUnit *CU,
222 const DWARFLineTable *LineTable,
224 bool NeedsAbsoluteFilePath,
225 std::string &FileName) {
228 !LineTable->getFileNameByIndex(FileIndex, NeedsAbsoluteFilePath,
231 if (NeedsAbsoluteFilePath && sys::path::is_relative(FileName)) {
232 // We may still need to append compilation directory of compile unit.
233 SmallString<16> AbsolutePath;
234 if (const char *CompilationDir = CU->getCompilationDir()) {
235 sys::path::append(AbsolutePath, CompilationDir);
237 sys::path::append(AbsolutePath, FileName);
238 FileName = AbsolutePath.str();
243 static bool getFileLineInfoForCompileUnit(DWARFCompileUnit *CU,
244 const DWARFLineTable *LineTable,
246 bool NeedsAbsoluteFilePath,
247 std::string &FileName,
248 uint32_t &Line, uint32_t &Column) {
249 if (CU == 0 || LineTable == 0)
251 // Get the index of row we're looking for in the line table.
252 uint32_t RowIndex = LineTable->lookupAddress(Address);
255 // Take file number and line/column from the row.
256 const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
257 if (!getFileNameForCompileUnit(CU, LineTable, Row.File,
258 NeedsAbsoluteFilePath, FileName))
265 DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address,
266 DILineInfoSpecifier Specifier) {
267 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
270 std::string FileName = "<invalid>";
271 std::string FunctionName = "<invalid>";
274 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
275 // The address may correspond to instruction in some inlined function,
276 // so we have to build the chain of inlined functions and take the
277 // name of the topmost function in it.
278 const DWARFDebugInfoEntryMinimal::InlinedChain &InlinedChain =
279 CU->getInlinedChainForAddress(Address);
280 if (InlinedChain.size() > 0) {
281 const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain[0];
282 if (const char *Name = TopFunctionDIE.getSubroutineName(CU))
286 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
287 const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
288 const bool NeedsAbsoluteFilePath =
289 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
290 getFileLineInfoForCompileUnit(CU, LineTable, Address,
291 NeedsAbsoluteFilePath,
292 FileName, Line, Column);
294 return DILineInfo(StringRef(FileName), StringRef(FunctionName),
298 DIInliningInfo DWARFContext::getInliningInfoForAddress(uint64_t Address,
299 DILineInfoSpecifier Specifier) {
300 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
302 return DIInliningInfo();
304 const DWARFDebugInfoEntryMinimal::InlinedChain &InlinedChain =
305 CU->getInlinedChainForAddress(Address);
306 if (InlinedChain.size() == 0)
307 return DIInliningInfo();
309 DIInliningInfo InliningInfo;
310 uint32_t CallFile = 0, CallLine = 0, CallColumn = 0;
311 const DWARFLineTable *LineTable = 0;
312 for (uint32_t i = 0, n = InlinedChain.size(); i != n; i++) {
313 const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain[i];
314 std::string FileName = "<invalid>";
315 std::string FunctionName = "<invalid>";
318 // Get function name if necessary.
319 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
320 if (const char *Name = FunctionDIE.getSubroutineName(CU))
323 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
324 const bool NeedsAbsoluteFilePath =
325 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
327 // For the topmost frame, initialize the line table of this
328 // compile unit and fetch file/line info from it.
329 LineTable = getLineTableForCompileUnit(CU);
330 // For the topmost routine, get file/line info from line table.
331 getFileLineInfoForCompileUnit(CU, LineTable, Address,
332 NeedsAbsoluteFilePath,
333 FileName, Line, Column);
335 // Otherwise, use call file, call line and call column from
336 // previous DIE in inlined chain.
337 getFileNameForCompileUnit(CU, LineTable, CallFile,
338 NeedsAbsoluteFilePath, FileName);
342 // Get call file/line/column of a current DIE.
344 FunctionDIE.getCallerFrame(CU, CallFile, CallLine, CallColumn);
347 DILineInfo Frame(StringRef(FileName), StringRef(FunctionName),
349 InliningInfo.addFrame(Frame);
354 DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
355 IsLittleEndian(Obj->isLittleEndian()) {
357 for (object::section_iterator i = Obj->begin_sections(),
358 e = Obj->end_sections();
359 i != e; i.increment(ec)) {
363 i->getContents(data);
365 name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
366 if (name == "debug_info")
368 else if (name == "debug_abbrev")
369 AbbrevSection = data;
370 else if (name == "debug_line")
372 else if (name == "debug_aranges")
373 ARangeSection = data;
374 else if (name == "debug_str")
375 StringSection = data;
376 else if (name == "debug_ranges") {
377 // FIXME: Use the other dwo range section when we emit it.
378 RangeDWOSection = data;
381 else if (name == "debug_info.dwo")
382 InfoDWOSection = data;
383 else if (name == "debug_abbrev.dwo")
384 AbbrevDWOSection = data;
385 else if (name == "debug_str.dwo")
386 StringDWOSection = data;
387 else if (name == "debug_str_offsets.dwo")
388 StringOffsetDWOSection = data;
389 // Any more debug info sections go here.
393 // TODO: For now only handle relocations for the debug_info section.
395 if (name == "debug_info")
397 else if (name == "debug_info.dwo")
398 Map = &InfoDWORelocMap;
402 if (i->begin_relocations() != i->end_relocations()) {
403 uint64_t SectionSize;
404 i->getSize(SectionSize);
405 for (object::relocation_iterator reloc_i = i->begin_relocations(),
406 reloc_e = i->end_relocations();
407 reloc_i != reloc_e; reloc_i.increment(ec)) {
409 reloc_i->getAddress(Address);
411 reloc_i->getType(Type);
413 object::RelocVisitor V(Obj->getFileFormatName());
414 // The section address is always 0 for debug sections.
415 object::RelocToApply R(V.visit(Type, *reloc_i));
417 SmallString<32> Name;
418 error_code ec(reloc_i->getTypeName(Name));
420 errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n";
422 errs() << "error: failed to compute relocation: "
427 if (Address + R.Width > SectionSize) {
428 errs() << "error: " << R.Width << "-byte relocation starting "
429 << Address << " bytes into section " << name << " which is "
430 << SectionSize << " bytes long.\n";
434 errs() << "error: can't handle a relocation of more than 8 bytes at "
438 DEBUG(dbgs() << "Writing " << format("%p", R.Value)
439 << " at " << format("%p", Address)
440 << " with width " << format("%d", R.Width)
442 Map->insert(std::make_pair(Address, std::make_pair(R.Width, R.Value)));
448 void DWARFContextInMemory::anchor() { }