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MC: permit emitting a symbol value as section relative

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This adds an optional parameter to the EmitSymbolValue method in MCStreamer to
permit emitting a symbol value as a section relative value.  This is to cover
the use in MCDwarf which should not really know about how to emit a section
relative value for a given target.

This addresses post-review comments from Eric Christopher in SVN r213275.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213463 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool 2014-07-19 21:01:58 +00:00
parent f7a4b7a676
commit ac1b5f177b
3 changed files with 14 additions and 6 deletions
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3
include/llvm/MC/MCStreamer.h
View File

@ -572,7 +572,8 @@ public:
/// EmitSymbolValue - Special case of EmitValue that avoids the client
/// having to pass in a MCExpr for MCSymbols.
void EmitSymbolValue(const MCSymbol *Sym, unsigned Size);
void EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
bool IsSectionRelative = false);
/// EmitGPRel64Value - Emit the expression @p Value into the output as a
/// gprel64 (64-bit GP relative) value.

6
lib/MC/MCDwarf.cpp
View File

@ -655,14 +655,14 @@ static void EmitGenDwarfInfo(MCStreamer *MCOS,
// The 2 byte DWARF version.
MCOS->EmitIntValue(context.getDwarfVersion(), 2);
const MCAsmInfo &AsmInfo = *context.getAsmInfo();
// The 4 byte offset to the debug abbrevs from the start of the .debug_abbrev,
// it is at the start of that section so this is zero.
if (AbbrevSectionSymbol == nullptr)
MCOS->EmitIntValue(0, 4);
else if (context.getAsmInfo()->needsDwarfSectionOffsetDirective())
MCOS->EmitCOFFSecRel32(AbbrevSectionSymbol);
else
MCOS->EmitSymbolValue(AbbrevSectionSymbol, 4);
MCOS->EmitSymbolValue(AbbrevSectionSymbol, 4,
AsmInfo.needsDwarfSectionOffsetDirective());
const MCAsmInfo *asmInfo = context.getAsmInfo();
int AddrSize = asmInfo->getPointerSize();

9
lib/MC/MCStreamer.cpp
View File

@ -148,8 +148,15 @@ void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
EmitValueImpl(Value, Size, Loc);
}
void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size) {
void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
bool IsSectionRelative) {
assert((!IsSectionRelative || Size == 4) &&
"SectionRelative value requires 4-bytes");
if (!IsSectionRelative)
EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size);
else
EmitCOFFSecRel32(Sym);
}
void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {