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Start using the AsmPrinter to emit our first class constants. This also

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drops our half-assed support for cygwin, which noone uses and doesn't work
anyway.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15839 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-08-16 23:16:06 +00:00
parent a80ba71efe
commit 055acae18c
1 changed files with 11 additions and 109 deletions
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120
lib/Target/X86/X86AsmPrinter.cpp
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@ -21,6 +21,7 @@
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
@ -36,11 +37,6 @@ using namespace llvm;
namespace {
Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
// FIXME: This should be automatically picked up by autoconf from the C
// frontend
cl::opt<bool> EmitCygwin("enable-cygwin-compatible-output", cl::Hidden,
cl::desc("Emit X86 assembly code suitable for consumption by cygwin"));
struct GasBugWorkaroundEmitter : public MachineCodeEmitter {
GasBugWorkaroundEmitter(std::ostream& o)
: O(o), OldFlags(O.flags()), firstByte(true) {
@ -71,27 +67,8 @@ namespace {
bool firstByte;
};
struct X86AsmPrinter : public MachineFunctionPass {
/// Output stream on which we're printing assembly code.
///
std::ostream &O;
/// Target machine description which we query for reg. names, data
/// layout, etc.
///
TargetMachine &TM;
/// Name-mangler for global names.
///
Mangler *Mang;
X86AsmPrinter(std::ostream &o, TargetMachine &tm) : O(o), TM(tm) { }
/// Cache of mangled name for current function. This is
/// recalculated at the beginning of each call to
/// runOnMachineFunction().
///
std::string CurrentFnName;
struct X86AsmPrinter : public AsmPrinter {
X86AsmPrinter(std::ostream &O, TargetMachine &TM) : AsmPrinter(O, TM) { }
virtual const char *getPassName() const {
return "X86 Assembly Printer";
@ -104,7 +81,7 @@ namespace {
bool printInstruction(const MachineInstr *MI);
// This method is used by the tablegen'erated instruction printer.
void printOperand(const MachineInstr *MI, unsigned OpNo, MVT::ValueType VT) {
void printOperand(const MachineInstr *MI, unsigned OpNo, MVT::ValueType VT){
const MachineOperand &MO = MI->getOperand(OpNo);
if (MO.getType() == MachineOperand::MO_MachineRegister) {
assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physref??");
@ -115,7 +92,8 @@ namespace {
}
}
void printCallOperand(const MachineInstr *MI, unsigned OpNo, MVT::ValueType VT) {
void printCallOperand(const MachineInstr *MI, unsigned OpNo,
MVT::ValueType VT) {
printOp(MI->getOperand(OpNo), true); // Don't print "OFFSET".
}
@ -142,7 +120,6 @@ namespace {
bool doInitialization(Module &M);
bool doFinalization(Module &M);
void emitGlobalConstant(const Constant* CV);
void emitConstantValueOnly(const Constant *CV);
};
} // end of anonymous namespace
@ -201,79 +178,6 @@ static void printAsCString(std::ostream &O, const ConstantArray *CVA) {
O << "\"";
}
// Print out the specified constant, without a storage class. Only the
// constants valid in constant expressions can occur here.
void X86AsmPrinter::emitConstantValueOnly(const Constant *CV) {
if (CV->isNullValue())
O << "0";
else if (const ConstantBool *CB = dyn_cast<ConstantBool>(CV)) {
assert(CB == ConstantBool::True);
O << "1";
} else if (const ConstantSInt *CI = dyn_cast<ConstantSInt>(CV))
if (((CI->getValue() << 32) >> 32) == CI->getValue())
O << CI->getValue();
else
O << (unsigned long long)CI->getValue();
else if (const ConstantUInt *CI = dyn_cast<ConstantUInt>(CV))
O << CI->getValue();
else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
// This is a constant address for a global variable or function. Use the
// name of the variable or function as the address value.
O << Mang->getValueName(GV);
else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
const TargetData &TD = TM.getTargetData();
switch(CE->getOpcode()) {
case Instruction::GetElementPtr: {
// generate a symbolic expression for the byte address
const Constant *ptrVal = CE->getOperand(0);
std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
if (unsigned Offset = TD.getIndexedOffset(ptrVal->getType(), idxVec)) {
O << "(";
emitConstantValueOnly(ptrVal);
O << ") + " << Offset;
} else {
emitConstantValueOnly(ptrVal);
}
break;
}
case Instruction::Cast: {
// Support only non-converting or widening casts for now, that is, ones
// that do not involve a change in value. This assertion is really gross,
// and may not even be a complete check.
Constant *Op = CE->getOperand(0);
const Type *OpTy = Op->getType(), *Ty = CE->getType();
// Remember, kids, pointers on x86 can be losslessly converted back and
// forth into 32-bit or wider integers, regardless of signedness. :-P
assert(((isa<PointerType>(OpTy)
&& (Ty == Type::LongTy || Ty == Type::ULongTy
|| Ty == Type::IntTy || Ty == Type::UIntTy))
|| (isa<PointerType>(Ty)
&& (OpTy == Type::LongTy || OpTy == Type::ULongTy
|| OpTy == Type::IntTy || OpTy == Type::UIntTy))
|| (((TD.getTypeSize(Ty) >= TD.getTypeSize(OpTy))
&& OpTy->isLosslesslyConvertibleTo(Ty))))
&& "FIXME: Don't yet support this kind of constant cast expr");
O << "(";
emitConstantValueOnly(Op);
O << ")";
break;
}
case Instruction::Add:
O << "(";
emitConstantValueOnly(CE->getOperand(0));
O << ") + (";
emitConstantValueOnly(CE->getOperand(1));
O << ")";
break;
default:
assert(0 && "Unsupported operator!");
}
} else {
assert(0 && "Unknown constant value!");
}
}
// Print a constant value or values, with the appropriate storage class as a
// prefix.
void X86AsmPrinter::emitGlobalConstant(const Constant *CV) {
@ -394,9 +298,8 @@ void X86AsmPrinter::printConstantPool(MachineConstantPool *MCP) {
/// method to print assembly for each instruction.
///
bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
setupMachineFunction(MF);
O << "\n\n";
// What's my mangled name?
CurrentFnName = Mang->getValueName(MF.getFunction());
// Print out constants referenced by the function
printConstantPool(MF.getConstantPool());
@ -405,8 +308,7 @@ bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
O << "\t.text\n";
O << "\t.align 16\n";
O << "\t.globl\t" << CurrentFnName << "\n";
if (!EmitCygwin)
O << "\t.type\t" << CurrentFnName << ", @function\n";
O << "\t.type\t" << CurrentFnName << ", @function\n";
O << CurrentFnName << ":\n";
// Print out code for the function.
@ -586,6 +488,7 @@ void X86AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
}
bool X86AsmPrinter::doInitialization(Module &M) {
AsmPrinter::doInitialization(M);
// Tell gas we are outputting Intel syntax (not AT&T syntax) assembly.
//
// Bug: gas in `intel_syntax noprefix' mode interprets the symbol `Sp' in an
@ -595,8 +498,7 @@ bool X86AsmPrinter::doInitialization(Module &M) {
// `undefined symbol' errors when linking. Workaround: Do not use `noprefix'
// mode, and decorate all register names with percent signs.
O << "\t.intel_syntax\n";
Mang = new Mangler(M, EmitCygwin);
return false; // success
return false;
}
// SwitchSection - Switch to the specified section of the executable if we are
@ -673,6 +575,6 @@ bool X86AsmPrinter::doFinalization(Module &M) {
}
}
delete Mang;
AsmPrinter::doFinalization(M);
return false; // success
}