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Changes to target powerpc for non-Darwin assemblers.

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1. Patches from Nick Lewycky.
2. Code to filter register names and print them as numeric values on
non-Darwin systems.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32721 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Laskey 2006-12-20 20:56:46 +00:00
parent 48c8e3de2f
commit b608a4dd4c
1 changed files with 62 additions and 10 deletions
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72
lib/Target/PowerPC/PPCAsmPrinter.cpp
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@ -86,12 +86,66 @@ namespace {
void printMachineInstruction(const MachineInstr *MI);
void printOp(const MachineOperand &MO);
/// stripRegisterPrefix - This method strips the character prefix from a
/// register name so that only the number is left. Used by for linux asm.
void stripRegisterPrefix(std::string &Name) {
// Potential prefixes.
static const char *Prefixes[] = { "r", "f", "v", "cr" };
unsigned NPrefixes = sizeof(Prefixes) / sizeof(const char *);
// Fetch string length.
unsigned Size = Name.size();
// Start position of numeric portion.
unsigned Pos = 0;
// Try each prefix.
for (unsigned i = 0; i < NPrefixes; ++i) {
const char *Prefix = Prefixes[i];
unsigned Length = strlen(Prefix);
// Does it match the beginning?
if (Name.compare(0, Length, Prefix, Length) == 0) {
// If so, start looking beyond the prefix.
Pos = strlen(Prefix);
break;
}
}
// If we have a match.
if (Pos) {
// Remaining characters better be digits.
for (unsigned j = Pos; j < Size; ++j) {
unsigned Ch = Name[j];
if (Ch < '0' || '9' < Ch) return;
}
// Pass back just the numeric portion.
Name = Name.substr(Pos, Size - Pos);
}
}
/// printRegister - Print register according to target requirements.
///
void printRegister(const MachineOperand &MO, bool R0AsZero) {
unsigned RegNo = MO.getReg();
assert(MRegisterInfo::isPhysicalRegister(RegNo) && "Not physreg??");
// If we should use 0 for R0.
if (R0AsZero && RegNo == PPC::R0) {
O << "0";
return;
}
std::string Name = TM.getRegisterInfo()->get(RegNo).Name;
// Linux assembler (Others?) does not take register mnemonics.
// FIXME - What about special registers used in mfspr/mtspr?
if (!Subtarget.isDarwin()) stripRegisterPrefix(Name);
O << Name;
}
void printOperand(const MachineInstr *MI, unsigned OpNo) {
const MachineOperand &MO = MI->getOperand(OpNo);
if (MO.isRegister()) {
assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??");
O << TM.getRegisterInfo()->get(MO.getReg()).Name;
printRegister(MO, false);
} else if (MO.isImmediate()) {
O << MO.getImmedValue();
} else {
@ -239,10 +293,7 @@ namespace {
// the value contained in the register. For this reason, the darwin
// assembler requires that we print r0 as 0 (no r) when used as the base.
const MachineOperand &MO = MI->getOperand(OpNo);
if (MO.getReg() == PPC::R0)
O << '0';
else
O << TM.getRegisterInfo()->get(MO.getReg()).Name;
printRegister(MO, true);
O << ", ";
printOperand(MI, OpNo+1);
}
@ -616,7 +667,7 @@ bool DarwinAsmPrinter::doFinalization(Module &M) {
SwitchToDataSection("\t.data", I);
O << ".comm " << name << "," << Size;
}
O << "\t\t; '" << I->getName() << "'\n";
O << "\t\t" << TAI->getCommentString() << " '" << I->getName() << "'\n";
} else {
switch (I->getLinkage()) {
case GlobalValue::LinkOnceLinkage:
@ -649,7 +700,8 @@ bool DarwinAsmPrinter::doFinalization(Module &M) {
}
EmitAlignment(Align, I);
O << name << ":\t\t\t\t; '" << I->getName() << "'\n";
O << name << ":\t\t\t\t" << TAI->getCommentString() << " '"
<< I->getName() << "'\n";
// If the initializer is a extern weak symbol, remember to emit the weak
// reference!
@ -751,8 +803,8 @@ bool DarwinAsmPrinter::doFinalization(Module &M) {
/// createDarwinCodePrinterPass - Returns a pass that prints the PPC assembly
/// code for a MachineFunction to the given output stream, in a format that the
/// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
/// for a MachineFunction to the given output stream, in a format that the
/// Darwin assembler can deal with.
///
FunctionPass *llvm::createPPCAsmPrinterPass(std::ostream &o,