Asm = AP;
}
+void WinCodeViewLineTables::endModule() {
+ if (FnDebugInfo.empty())
+ return;
+
+ assert(Asm != nullptr);
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getCOFFDebugSymbolsSection());
+ Asm->EmitInt32(COFF::DEBUG_SECTION_MAGIC);
+
+ // The COFF .debug$S section consists of several subsections, each starting
+ // with a 4-byte control code (e.g. 0xF1, 0xF2, etc) and then a 4-byte length
+ // of the payload followed by the payload itself. The subsections are 4-byte
+ // aligned.
+
+ // Emit per-function debug information. This code is extracted into a
+ // separate function for readability.
+ for (size_t I = 0, E = VisitedFunctions.size(); I != E; ++I)
+ emitDebugInfoForFunction(VisitedFunctions[I]);
+
+ // This subsection holds a file index to offset in string table table.
+ Asm->OutStreamer.AddComment("File index to string table offset subsection");
+ Asm->EmitInt32(COFF::DEBUG_INDEX_SUBSECTION);
+ size_t NumFilenames = FileNameRegistry.Infos.size();
+ Asm->EmitInt32(8 * NumFilenames);
+ for (size_t I = 0, E = FileNameRegistry.Filenames.size(); I != E; ++I) {
+ StringRef Filename = FileNameRegistry.Filenames[I];
+ // For each unique filename, just write its offset in the string table.
+ Asm->EmitInt32(FileNameRegistry.Infos[Filename].StartOffset);
+ // The function name offset is not followed by any additional data.
+ Asm->EmitInt32(0);
+ }
+
+ // This subsection holds the string table.
+ Asm->OutStreamer.AddComment("String table");
+ Asm->EmitInt32(COFF::DEBUG_STRING_TABLE_SUBSECTION);
+ Asm->EmitInt32(FileNameRegistry.LastOffset);
+ // The payload starts with a null character.
+ Asm->EmitInt8(0);
+
+ for (size_t I = 0, E = FileNameRegistry.Filenames.size(); I != E; ++I) {
+ // Just emit unique filenames one by one, separated by a null character.
+ Asm->OutStreamer.EmitBytes(FileNameRegistry.Filenames[I]);
+ Asm->EmitInt8(0);
+ }
+
+ // No more subsections. Fill with zeros to align the end of the section by 4.
+ Asm->OutStreamer.EmitFill((-FileNameRegistry.LastOffset) % 4, 0);
+
+ clear();
+}
+
static void EmitLabelDiff(MCStreamer &Streamer,
const MCSymbol *From, const MCSymbol *To) {
MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
}
FilenameSegmentLengths[LastSegmentEnd] = FI.Instrs.size() - LastSegmentEnd;
- // Emit the control code of the subsection followed by the payload size.
+ // Emit a line table subsection, requred to do PC-to-file:line lookup.
Asm->OutStreamer.AddComment(
- "Linetable subsection for " + Twine(Fn->getName()));
+ "Line table subsection for " + Twine(Fn->getName()));
Asm->EmitInt32(COFF::DEBUG_LINE_TABLE_SUBSECTION);
MCSymbol *SubsectionBegin = Asm->MMI->getContext().CreateTempSymbol(),
*SubsectionEnd = Asm->MMI->getContext().CreateTempSymbol();
Asm->OutStreamer.EmitLabel(SubsectionEnd);
}
-void WinCodeViewLineTables::endModule() {
- if (FnDebugInfo.empty())
- return;
-
- assert(Asm != nullptr);
- Asm->OutStreamer.SwitchSection(
- Asm->getObjFileLowering().getCOFFDebugSymbolsSection());
- Asm->EmitInt32(COFF::DEBUG_SECTION_MAGIC);
-
- // The COFF .debug$S section consists of several subsections, each starting
- // with a 4-byte control code (e.g. 0xF1, 0xF2, etc) and then a 4-byte length
- // of the payload followed by the payload itself. The subsections are 4-byte
- // aligned.
-
- for (size_t I = 0, E = VisitedFunctions.size(); I != E; ++I)
- emitDebugInfoForFunction(VisitedFunctions[I]);
-
- // This subsection holds a file index to offset in string table table.
- Asm->OutStreamer.AddComment("File index to string table offset subsection");
- Asm->EmitInt32(COFF::DEBUG_INDEX_SUBSECTION);
- size_t NumFilenames = FileNameRegistry.Infos.size();
- Asm->EmitInt32(8 * NumFilenames);
- for (size_t I = 0, E = FileNameRegistry.Filenames.size(); I != E; ++I) {
- StringRef Filename = FileNameRegistry.Filenames[I];
- // For each unique filename, just write its offset in the string table.
- Asm->EmitInt32(FileNameRegistry.Infos[Filename].StartOffset);
- // The function name offset is not followed by any additional data.
- Asm->EmitInt32(0);
- }
-
- // This subsection holds the string table.
- Asm->OutStreamer.AddComment("String table");
- Asm->EmitInt32(COFF::DEBUG_STRING_TABLE_SUBSECTION);
- Asm->EmitInt32(FileNameRegistry.LastOffset);
- // The payload starts with a null character.
- Asm->EmitInt8(0);
-
- for (size_t I = 0, E = FileNameRegistry.Filenames.size(); I != E; ++I) {
- // Just emit unique filenames one by one, separated by a null character.
- Asm->OutStreamer.EmitBytes(FileNameRegistry.Filenames[I]);
- Asm->EmitInt8(0);
- }
-
- // No more subsections. Fill with zeros to align the end of the section by 4.
- Asm->OutStreamer.EmitFill((-FileNameRegistry.LastOffset) % 4, 0);
-
- clear();
-}
-
void WinCodeViewLineTables::beginFunction(const MachineFunction *MF) {
assert(!CurFn && "Can't process two functions at once!");