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Add an EmitAbsValue helper method and use it in cases where we want to be sure

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that no relocations are used (on MochO).
Fixes llc producing different output from llc + llvm-mc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121000 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2010-12-06 14:53:14 +00:00
parent 03a83a3f41
commit 2303c9dd69
4 changed files with 14 additions and 10 deletions
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5
include/llvm/MC/MCStreamer.h
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@ -249,6 +249,11 @@ namespace llvm {
virtual void EmitIntValue(uint64_t Value, unsigned Size, virtual void EmitIntValue(uint64_t Value, unsigned Size,
unsigned AddrSpace = 0); unsigned AddrSpace = 0);
/// EmitAbsValue - Emit the Value, but try to avoid relocations. On MachO
/// this is done by producing
/// foo = value
/// .long foo
void EmitAbsValue(const MCExpr *Value, unsigned Size);
virtual void EmitULEB128Value(const MCExpr *Value, virtual void EmitULEB128Value(const MCExpr *Value,
unsigned AddrSpace = 0) = 0; unsigned AddrSpace = 0) = 0;

2
lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
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@ -156,7 +156,7 @@ void AsmPrinter::EmitReference(const MCSymbol *Sym, unsigned Encoding) const {
const MCExpr *Exp = const MCExpr *Exp =
TLOF.getExprForDwarfReference(Sym, Mang, MMI, Encoding, OutStreamer); TLOF.getExprForDwarfReference(Sym, Mang, MMI, Encoding, OutStreamer);
OutStreamer.EmitValue(Exp, GetSizeOfEncodedValue(Encoding), /*addrspace*/0); OutStreamer.EmitAbsValue(Exp, GetSizeOfEncodedValue(Encoding));
} }
void AsmPrinter::EmitReference(const GlobalValue *GV, unsigned Encoding)const{ void AsmPrinter::EmitReference(const GlobalValue *GV, unsigned Encoding)const{

11
lib/MC/MCDwarf.cpp
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@ -213,15 +213,8 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS,
// The first 4 bytes is the total length of the information for this // The first 4 bytes is the total length of the information for this
// compilation unit (not including these 4 bytes for the length). // compilation unit (not including these 4 bytes for the length).
// FIXME: We create the dummy TotalLength variable because LineEndSym points MCOS->EmitAbsValue(MakeStartMinusEndExpr(MCOS, LineStartSym, LineEndSym,4),
// to the end of the section and the darwin assembler doesn't consider that 4);
// difference an assembly time constant. It might be better for this to be
// proected by a flag.
MCSymbol *TotalLength = MCOS->getContext().CreateTempSymbol();
MCOS->EmitAssignment(TotalLength,
MakeStartMinusEndExpr(MCOS, LineStartSym, LineEndSym,
4));
MCOS->EmitSymbolValue(TotalLength, 4, 0);
// Next 2 bytes is the Version, which is Dwarf 2. // Next 2 bytes is the Version, which is Dwarf 2.
MCOS->EmitIntValue(2, 2); MCOS->EmitIntValue(2, 2);

6
lib/MC/MCStreamer.cpp
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@ -72,6 +72,12 @@ void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
EmitBytes(OSE.str(), AddrSpace); EmitBytes(OSE.str(), AddrSpace);
} }
void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
MCSymbol *ABS = getContext().CreateTempSymbol();
EmitAssignment(ABS, Value);
EmitSymbolValue(ABS, Size, 0);
}
void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size, void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
unsigned AddrSpace) { unsigned AddrSpace) {
EmitValue(MCSymbolRefExpr::Create(Sym, getContext()), Size, AddrSpace); EmitValue(MCSymbolRefExpr::Create(Sym, getContext()), Size, AddrSpace);