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Use target-specific machine operand flags to eliminate a gross hack

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from the asmprinter.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74184 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-06-25 17:38:33 +00:00
parent b1fb84dee9
commit ac5e887a6c
3 changed files with 29 additions and 39 deletions
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43
lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
View File

@ -405,25 +405,15 @@ void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
O << Name; O << Name;
if (shouldPrintPLT(TM, Subtarget)) { if (MO.getTargetFlags() == X86II::MO_GOT_ABSOLUTE_ADDRESS) {
std::string GOTName(TAI->getGlobalPrefix()); O << " + [.-";
GOTName+="_GLOBAL_OFFSET_TABLE_"; PrintPICBaseSymbol();
if (Name == GOTName) { O << ']';
// HACK! Emit extra offset to PC during printing GOT offset to
// compensate for the size of popl instruction. The resulting code
// should look like:
// call .piclabel
// piclabel:
// popl %some_register
// addl $__GLOBAL_OFFSET_TABLE_ + [.-piclabel], %some_register
O << " + [.-";
PrintPICBaseSymbol();
O << ']';
}
O << "@PLT";
} }
if (shouldPrintPLT(TM, Subtarget))
O << "@PLT";
if (needCloseParen) if (needCloseParen)
O << ')'; O << ')';
@ -633,21 +623,10 @@ void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
O << Name; O << Name;
if (shouldPrintPLT(TM, Subtarget)) { if (MO.getTargetFlags() == X86II::MO_GOT_ABSOLUTE_ADDRESS) {
std::string GOTName(TAI->getGlobalPrefix()); O << " + [.-";
GOTName+="_GLOBAL_OFFSET_TABLE_"; PrintPICBaseSymbol();
if (Name == GOTName) { O << ']';
// HACK! Emit extra offset to PC during printing GOT offset to
// compensate for the size of popl instruction. The resulting code
// should look like:
// call .piclabel
// piclabel:
// popl %some_register
// addl $__GLOBAL_OFFSET_TABLE_ + [.-piclabel], %some_register
O << " + [.-";
PrintPICBaseSymbol();
O << ']';
}
} }
if (needCloseParen) if (needCloseParen)

12
lib/Target/X86/X86InstrInfo.cpp
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@ -3219,17 +3219,17 @@ unsigned X86InstrInfo::getGlobalBaseReg(MachineFunction *MF) const {
const TargetInstrInfo *TII = TM.getInstrInfo(); const TargetInstrInfo *TII = TM.getInstrInfo();
// Operand of MovePCtoStack is completely ignored by asm printer. It's // Operand of MovePCtoStack is completely ignored by asm printer. It's
// only used in JIT code emission as displacement to pc. // only used in JIT code emission as displacement to pc.
BuildMI(FirstMBB, MBBI, DL, TII->get(X86::MOVPC32r), PC) BuildMI(FirstMBB, MBBI, DL, TII->get(X86::MOVPC32r), PC).addImm(0);
.addImm(0);
// If we're using vanilla 'GOT' PIC style, we should use relative addressing // If we're using vanilla 'GOT' PIC style, we should use relative addressing
// not to pc, but to _GLOBAL_ADDRESS_TABLE_ external // not to pc, but to _GLOBAL_OFFSET_TABLE_ external.
if (TM.getRelocationModel() == Reloc::PIC_ && if (TM.getRelocationModel() == Reloc::PIC_ &&
TM.getSubtarget<X86Subtarget>().isPICStyleGOT()) { TM.getSubtarget<X86Subtarget>().isPICStyleGOT()) {
GlobalBaseReg = GlobalBaseReg = RegInfo.createVirtualRegister(X86::GR32RegisterClass);
RegInfo.createVirtualRegister(X86::GR32RegisterClass); // Generate addl $__GLOBAL_OFFSET_TABLE_ + [.-piclabel], %some_register
BuildMI(FirstMBB, MBBI, DL, TII->get(X86::ADD32ri), GlobalBaseReg) BuildMI(FirstMBB, MBBI, DL, TII->get(X86::ADD32ri), GlobalBaseReg)
.addReg(PC).addExternalSymbol("_GLOBAL_OFFSET_TABLE_"); .addReg(PC).addExternalSymbol("_GLOBAL_OFFSET_TABLE_", 0,
X86II::MO_GOT_ABSOLUTE_ADDRESS);
} else { } else {
GlobalBaseReg = PC; GlobalBaseReg = PC;
} }

13
lib/Target/X86/X86InstrInfo.h
View File

@ -71,7 +71,18 @@ namespace X86 {
namespace X86II { namespace X86II {
enum { enum {
//===------------------------------------------------------------------===// //===------------------------------------------------------------------===//
// Instruction types. These are the standard/most common forms for X86 // X86 Specific MachineOperand flags.
MO_NO_FLAG = 0,
/// MO_GOT_ABSOLUTE_ADDRESS - On a symbol operand, this represents a
/// relocation of:
/// $SYMBOL_LABEL + [. - PICBASELABEL]
MO_GOT_ABSOLUTE_ADDRESS = 1,
//===------------------------------------------------------------------===//
// Instruction encodings. These are the standard/most common forms for X86
// instructions. // instructions.
// //