void CodeViewDebug::endModule() {
if (FnDebugInfo.empty())
return;
emitTypeInformation();
// FIXME: For functions that are comdat, we should emit separate .debug$S
// sections that are comdat associative with the main function instead of
// having one big .debug$S section.
assert(Asm != nullptr);
Asm->OutStreamer->SwitchSection(
Asm->getObjFileLowering().getCOFFDebugSymbolsSection());
Asm->EmitInt32(COFF::DEBUG_SECTION_MAGIC);
// The COFF .debug$S section consists of several subsections, each starting
// with a 4-byte control code (e.g. 0xF1, 0xF2, etc) and then a 4-byte length
// of the payload followed by the payload itself. The subsections are 4-byte
// aligned.
// Emit per-function debug information.
for (auto &P : FnDebugInfo)
emitDebugInfoForFunction(P.first, P.second);
// This subsection holds a file index to offset in string table table.
Asm->OutStreamer->AddComment("File index to string table offset subsection");
Asm->OutStreamer->EmitCVFileChecksumsDirective();
// This subsection holds the string table.
Asm->OutStreamer->AddComment("String table");
Asm->OutStreamer->EmitCVStringTableDirective();
clear();
}
void WinCodeViewLineTables::endModule() {
if (FnDebugInfo.empty())
return;
assert(Asm != nullptr);
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getCOFFDebugSymbolsSection());
Asm->EmitInt32(COFF::DEBUG_SECTION_MAGIC);
// The COFF .debug$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();
}