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start producing reloc_pcrel_4byte/reloc_pcrel_1byte for calls.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96028 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-02-12 22:36:47 +00:00
parent 252968a76f
commit cf65339b52
1 changed files with 28 additions and 23 deletions
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51
lib/Target/X86/X86MCCodeEmitter.cpp
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@ -80,7 +80,8 @@ public:
}
}
void EmitImmediate(const MCOperand &Disp, unsigned ImmSize,
void EmitImmediate(const MCOperand &Disp,
unsigned ImmSize, MCFixupKind FixupKind,
unsigned &CurByte, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups) const;
@ -132,8 +133,25 @@ static bool isDisp8(int Value) {
return Value == (signed char)Value;
}
/// getImmFixupKind - Return the appropriate fixup kind to use for an immediate
/// in an instruction with the specified TSFlags.
static MCFixupKind getImmFixupKind(unsigned TSFlags) {
unsigned Size = X86II::getSizeOfImm(TSFlags);
bool isPCRel = X86II::isImmPCRel(TSFlags);
// FIXME: Pass in the relocation type, this is just a hack..
switch (Size) {
default: assert(0 && "Unknown immediate size");
case 1: return isPCRel ? MCFixupKind(X86::reloc_pcrel_1byte) : FK_Data_1;
case 4: return isPCRel ? MCFixupKind(X86::reloc_pcrel_4byte) : FK_Data_4;
case 2: assert(!isPCRel); return FK_Data_2;
case 8: assert(!isPCRel); return FK_Data_8;
}
}
void X86MCCodeEmitter::
EmitImmediate(const MCOperand &DispOp, unsigned Size,
EmitImmediate(const MCOperand &DispOp, unsigned Size, MCFixupKind FixupKind,
unsigned &CurByte, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups) const {
// If this is a simple integer displacement that doesn't require a relocation,
@ -143,22 +161,8 @@ EmitImmediate(const MCOperand &DispOp, unsigned Size,
return;
}
// FIXME: Pass in the relocation type, this is just a hack..
unsigned FixupKind;
if (Size == 1)
FixupKind = FK_Data_1;
else if (Size == 2)
FixupKind = FK_Data_2;
else if (Size == 4)
FixupKind = FK_Data_4;
else {
assert(Size == 8 && "Unknown immediate size");
FixupKind = FK_Data_8;
}
// Emit a symbolic constant as a fixup and 4 zeros.
Fixups.push_back(MCFixup::Create(CurByte, DispOp.getExpr(),
MCFixupKind(FixupKind)));
Fixups.push_back(MCFixup::Create(CurByte, DispOp.getExpr(), FixupKind));
EmitConstant(0, Size, CurByte, OS);
}
@ -195,7 +199,7 @@ void X86MCCodeEmitter::EmitMemModRMByte(const MCInst &MI, unsigned Op,
if (BaseReg == 0 || // [disp32] in X86-32 mode
BaseReg == X86::RIP) { // [disp32+RIP] in X86-64 mode
EmitByte(ModRMByte(0, RegOpcodeField, 5), CurByte, OS);
EmitImmediate(Disp, 4, CurByte, OS, Fixups);
EmitImmediate(Disp, 4, FK_Data_4, CurByte, OS, Fixups);
return;
}
@ -211,13 +215,13 @@ void X86MCCodeEmitter::EmitMemModRMByte(const MCInst &MI, unsigned Op,
// Otherwise, if the displacement fits in a byte, encode as [REG+disp8].
if (Disp.isImm() && isDisp8(Disp.getImm())) {
EmitByte(ModRMByte(1, RegOpcodeField, BaseRegNo), CurByte, OS);
EmitImmediate(Disp, 1, CurByte, OS, Fixups);
EmitImmediate(Disp, 1, FK_Data_1, CurByte, OS, Fixups);
return;
}
// Otherwise, emit the most general non-SIB encoding: [REG+disp32]
EmitByte(ModRMByte(2, RegOpcodeField, BaseRegNo), CurByte, OS);
EmitImmediate(Disp, 4, CurByte, OS, Fixups);
EmitImmediate(Disp, 4, FK_Data_4, CurByte, OS, Fixups);
return;
}
@ -272,9 +276,9 @@ void X86MCCodeEmitter::EmitMemModRMByte(const MCInst &MI, unsigned Op,
// Do we need to output a displacement?
if (ForceDisp8)
EmitImmediate(Disp, 1, CurByte, OS, Fixups);
EmitImmediate(Disp, 1, FK_Data_1, CurByte, OS, Fixups);
else if (ForceDisp32 || Disp.getImm() != 0)
EmitImmediate(Disp, 4, CurByte, OS, Fixups);
EmitImmediate(Disp, 4, FK_Data_4, CurByte, OS, Fixups);
}
/// DetermineREXPrefix - Determine if the MCInst has to be encoded with a X86-64
@ -587,7 +591,8 @@ EncodeInstruction(const MCInst &MI, raw_ostream &OS,
// FIXME: This should pass in whether the value is pc relative or not. This
// information should be aquired from TSFlags as well.
if (CurOp != NumOps)
EmitImmediate(MI.getOperand(CurOp++), X86II::getSizeOfImm(TSFlags),
EmitImmediate(MI.getOperand(CurOp++),
X86II::getSizeOfImm(TSFlags), getImmFixupKind(TSFlags),
CurByte, OS, Fixups);
#ifndef NDEBUG