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COFF: add support for .file symbols

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Add support for emitting .file records.  This is mostly a quality of
implementation change (more complete support for COFF file emission) that was
noticed while working on COFF file emission for Windows on ARM.

A .file record is emitted as a symbol with storage class FILE (103) and the name
".file".  A series of auxiliary format 4 records follow which contain the file
name.  The filename is stored as an ANSI string and is padded with NULL if the
length is not a multiple of COFF::SymbolSize (18).

llvm-svn: 206355
This commit is contained in:
Saleem Abdulrasool 2014-04-16 04:15:32 +00:00
parent 2d5e8b4ac9
commit f1d6af74d5
3 changed files with 47 additions and 2 deletions
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29
lib/MC/WinCOFFObjectWriter.cpp
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@ -633,6 +633,35 @@ void WinCOFFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm,
// "Define" each section & symbol. This creates section & symbol
// entries in the staging area.
static_assert(sizeof(COFF::AuxiliaryFile::FileName) == COFF::SymbolSize,
"size mismatch for COFF::AuxiliaryFile::FileName");
for (auto FI = Asm.file_names_begin(), FE = Asm.file_names_end();
FI != FE; ++FI) {
// round up to calculate the number of auxiliary symbols required
unsigned Count = (FI->size() + COFF::SymbolSize) / COFF::SymbolSize;
COFFSymbol *file = createSymbol(".file");
file->Data.StorageClass = COFF::IMAGE_SYM_CLASS_FILE;
file->Aux.resize(Count);
unsigned Offset = 0;
unsigned Length = FI->size();
for (auto & Aux : file->Aux) {
Aux.AuxType = ATFile;
if (Length > COFF::SymbolSize) {
memcpy(Aux.Aux.File.FileName, FI->c_str() + Offset, COFF::SymbolSize);
Length = Length - COFF::SymbolSize;
} else {
memcpy(Aux.Aux.File.FileName, FI->c_str() + Offset, Length);
memset(&Aux.Aux.File.FileName[Length], 0, COFF::SymbolSize - Length);
Length = 0;
}
Offset = Offset + COFF::SymbolSize;
}
}
for (MCAssembler::const_iterator i = Asm.begin(), e = Asm.end(); i != e; i++)
DefineSection(*i);

3
lib/MC/WinCOFFStreamer.cpp
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@ -266,8 +266,7 @@ void WinCOFFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
}
void WinCOFFStreamer::EmitFileDirective(StringRef Filename) {
// Ignore for now, linkers don't care, and proper debug
// info will be a much large effort.
getAssembler().addFileName(Filename);
}
// TODO: Implement this if you want to emit .comment section in COFF obj files.

17
test/MC/COFF/file.s Normal file
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@ -0,0 +1,17 @@
// RUN: llvm-mc -triple i686-windows -filetype obj %s -o - | llvm-objdump -t - \
// RUN: | FileCheck %s -check-prefix CHECK-PRINT
.file "null-padded.asm"
// CHECK-PRINT: .file
// CHECK-PRINT-NEXT: AUX null-padded.asm{{$}}
.file "eighteen-chars.asm"
// CHECK-PRINT: .file
// CHECK-PRINT-NEXT: AUX eighteen-chars.asm{{$}}
.file "multiple-auxiliary-entries.asm"
// CHECK-PRINT: .file
// CHECK-PRINT-NEXT: AUX multiple-auxiliary-entries.asm{{$}}