300 lines
10 KiB
C++
300 lines
10 KiB
C++
//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the AsmPrinter class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/Constants.h"
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#include "llvm/Instruction.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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bool AsmPrinter::doInitialization(Module &M) {
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Mang = new Mangler(M, GlobalPrefix);
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return false;
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}
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bool AsmPrinter::doFinalization(Module &M) {
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delete Mang; Mang = 0;
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return false;
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}
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void AsmPrinter::setupMachineFunction(MachineFunction &MF) {
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// What's my mangled name?
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CurrentFnName = Mang->getValueName((Value*)MF.getFunction());
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}
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// emitAlignment - Emit an alignment directive to the specified power of two.
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void AsmPrinter::emitAlignment(unsigned NumBits) const {
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if (AlignmentIsInBytes) NumBits = 1 << NumBits;
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O << AlignDirective << NumBits << "\n";
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}
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/// emitZeros - Emit a block of zeros.
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///
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void AsmPrinter::emitZeros(unsigned NumZeros) const {
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if (NumZeros) {
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if (ZeroDirective)
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O << ZeroDirective << NumZeros << "\n";
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else {
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for (; NumZeros; --NumZeros)
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O << Data8bitsDirective << "0\n";
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}
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}
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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 AsmPrinter::emitConstantValueOnly(const Constant *CV) {
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if (CV->isNullValue() || isa<UndefValue>(CV))
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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 (isa<GlobalValue>((Value*)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(CV);
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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 can be losslessly converted back and forth
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// 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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/// toOctal - Convert the low order bits of X into an octal digit.
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///
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static inline char toOctal(int X) {
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return (X&7)+'0';
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}
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/// getAsCString - Return the specified array as a C compatible string, only if
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/// the predicate isString is true.
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///
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static void printAsCString(std::ostream &O, const ConstantArray *CVA) {
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assert(CVA->isString() && "Array is not string compatible!");
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O << "\"";
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for (unsigned i = 0; i != CVA->getNumOperands(); ++i) {
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unsigned char C = cast<ConstantInt>(CVA->getOperand(i))->getRawValue();
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if (C == '"') {
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O << "\\\"";
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} else if (C == '\\') {
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O << "\\\\";
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} else if (isprint(C)) {
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O << C;
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} else {
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switch(C) {
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case '\b': O << "\\b"; break;
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case '\f': O << "\\f"; break;
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case '\n': O << "\\n"; break;
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case '\r': O << "\\r"; break;
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case '\t': O << "\\t"; break;
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default:
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O << '\\';
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O << toOctal(C >> 6);
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O << toOctal(C >> 3);
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O << toOctal(C >> 0);
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break;
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}
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}
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}
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O << "\"";
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}
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/// emitGlobalConstant - Print a general LLVM constant to the .s file.
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///
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void AsmPrinter::emitGlobalConstant(const Constant *CV) {
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const TargetData &TD = TM.getTargetData();
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if (CV->isNullValue() || isa<UndefValue>(CV)) {
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emitZeros(TD.getTypeSize(CV->getType()));
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return;
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} else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
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if (CVA->isString()) {
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O << AsciiDirective;
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printAsCString(O, CVA);
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O << "\n";
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} else { // Not a string. Print the values in successive locations
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for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
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emitGlobalConstant(CVA->getOperand(i));
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}
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return;
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} else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
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// Print the fields in successive locations. Pad to align if needed!
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const StructLayout *cvsLayout = TD.getStructLayout(CVS->getType());
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unsigned sizeSoFar = 0;
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for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
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const Constant* field = CVS->getOperand(i);
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// Check if padding is needed and insert one or more 0s.
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unsigned fieldSize = TD.getTypeSize(field->getType());
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unsigned padSize = ((i == e-1? cvsLayout->StructSize
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: cvsLayout->MemberOffsets[i+1])
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- cvsLayout->MemberOffsets[i]) - fieldSize;
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sizeSoFar += fieldSize + padSize;
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// Now print the actual field value
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emitGlobalConstant(field);
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// Insert the field padding unless it's zero bytes...
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emitZeros(padSize);
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}
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assert(sizeSoFar == cvsLayout->StructSize &&
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"Layout of constant struct may be incorrect!");
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return;
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} else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
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// FP Constants are printed as integer constants to avoid losing
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// precision...
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double Val = CFP->getValue();
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if (CFP->getType() == Type::DoubleTy) {
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union DU { // Abide by C TBAA rules
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double FVal;
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uint64_t UVal;
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} U;
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U.FVal = Val;
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if (Data64bitsDirective)
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O << Data64bitsDirective << U.UVal << "\t" << CommentString
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<< " double value: " << Val << "\n";
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else if (TD.isBigEndian()) {
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O << Data32bitsDirective << unsigned(U.UVal >> 32)
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<< "\t" << CommentString << " double most significant word "
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<< Val << "\n";
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O << Data32bitsDirective << unsigned(U.UVal)
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<< "\t" << CommentString << " double least significant word "
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<< Val << "\n";
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} else {
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O << Data32bitsDirective << unsigned(U.UVal)
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<< "\t" << CommentString << " double least significant word " << Val
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<< "\n";
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O << Data32bitsDirective << unsigned(U.UVal >> 32)
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<< "\t" << CommentString << " double most significant word " << Val
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<< "\n";
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}
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return;
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} else {
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union FU { // Abide by C TBAA rules
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float FVal;
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int32_t UVal;
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} U;
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U.FVal = Val;
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O << Data32bitsDirective << U.UVal << "\t" << CommentString
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<< " float " << Val << "\n";
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return;
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}
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} else if (CV->getType() == Type::ULongTy || CV->getType() == Type::LongTy) {
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
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uint64_t Val = CI->getRawValue();
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if (Data64bitsDirective)
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O << Data64bitsDirective << Val << "\n";
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else if (TD.isBigEndian()) {
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O << Data32bitsDirective << unsigned(Val >> 32)
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<< "\t" << CommentString << " Double-word most significant word "
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<< Val << "\n";
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O << Data32bitsDirective << unsigned(Val)
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<< "\t" << CommentString << " Double-word least significant word "
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<< Val << "\n";
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} else {
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O << Data32bitsDirective << unsigned(Val)
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<< "\t" << CommentString << " Double-word least significant word "
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<< Val << "\n";
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O << Data32bitsDirective << unsigned(Val >> 32)
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<< "\t" << CommentString << " Double-word most significant word "
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<< Val << "\n";
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}
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return;
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}
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}
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const Type *type = CV->getType();
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switch (type->getTypeID()) {
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case Type::BoolTyID:
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case Type::UByteTyID: case Type::SByteTyID:
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O << Data8bitsDirective;
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break;
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case Type::UShortTyID: case Type::ShortTyID:
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O << Data16bitsDirective;
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break;
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case Type::PointerTyID:
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case Type::UIntTyID: case Type::IntTyID:
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O << Data32bitsDirective;
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break;
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case Type::ULongTyID: case Type::LongTyID:
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assert (0 && "Should have already output double-word constant.");
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case Type::FloatTyID: case Type::DoubleTyID:
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assert (0 && "Should have already output floating point constant.");
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default:
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assert (0 && "Can't handle printing this type of thing");
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break;
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}
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emitConstantValueOnly(CV);
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O << "\n";
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}
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