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