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-rw-r--r--lib/CodeGen/AsmPrinter.cpp305
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diff --git a/lib/CodeGen/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter.cpp
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+//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the AsmPrinter class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/Constants.h"
+#include "llvm/Instruction.h"
+#include "llvm/Support/Mangler.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Target/TargetMachine.h"
+using namespace llvm;
+
+bool AsmPrinter::doInitialization(Module &M) {
+ Mang = new Mangler(M, GlobalPrefix);
+ return false;
+}
+
+bool AsmPrinter::doFinalization(Module &M) {
+ delete Mang; Mang = 0;
+ return false;
+}
+
+void AsmPrinter::setupMachineFunction(MachineFunction &MF) {
+ // What's my mangled name?
+ CurrentFnName = Mang->getValueName((Value*)MF.getFunction());
+}
+
+// emitAlignment - Emit an alignment directive to the specified power of two.
+void AsmPrinter::emitAlignment(unsigned NumBits) const {
+ if (AlignmentIsInBytes) NumBits = 1 << NumBits;
+ O << AlignDirective << NumBits << "\n";
+}
+
+/// emitZeros - Emit a block of zeros.
+///
+void AsmPrinter::emitZeros(uint64_t NumZeros) const {
+ if (NumZeros) {
+ if (ZeroDirective)
+ O << ZeroDirective << NumZeros << "\n";
+ else {
+ for (; NumZeros; --NumZeros)
+ O << Data8bitsDirective << "0\n";
+ }
+ }
+}
+
+// Print out the specified constant, without a storage class. Only the
+// constants valid in constant expressions can occur here.
+void AsmPrinter::emitConstantValueOnly(const Constant *CV) {
+ if (CV->isNullValue() || isa<UndefValue>(CV))
+ 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 << (uint64_t)CI->getValue();
+ else if (const ConstantUInt *CI = dyn_cast<ConstantUInt>(CV))
+ O << CI->getValue();
+ else if (isa<GlobalValue>((Value*)CV)) {
+ // This is a constant address for a global variable or function. Use the
+ // name of the variable or function as the address value, possibly
+ // decorating it with GlobalVarAddrPrefix/Suffix or
+ // FunctionAddrPrefix/Suffix (these all default to "" )
+ if (isa<Function>((Value*)CV))
+ O << FunctionAddrPrefix << Mang->getValueName(CV) << FunctionAddrSuffix;
+ else
+ O << GlobalVarAddrPrefix << Mang->getValueName(CV) << GlobalVarAddrSuffix;
+ } 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 (int64_t Offset = TD.getIndexedOffset(ptrVal->getType(), idxVec)) {
+ if (Offset)
+ O << "(";
+ emitConstantValueOnly(ptrVal);
+ if (Offset > 0)
+ O << ") + " << Offset;
+ else if (Offset < 0)
+ 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 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!");
+ }
+}
+
+/// toOctal - Convert the low order bits of X into an octal digit.
+///
+static inline char toOctal(int X) {
+ return (X&7)+'0';
+}
+
+/// getAsCString - Return the specified array as a C compatible string, only if
+/// the predicate isString is true.
+///
+static void printAsCString(std::ostream &O, const ConstantArray *CVA) {
+ assert(CVA->isString() && "Array is not string compatible!");
+
+ O << "\"";
+ for (unsigned i = 0; i != CVA->getNumOperands(); ++i) {
+ unsigned char C =
+ (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getRawValue();
+
+ if (C == '"') {
+ O << "\\\"";
+ } else if (C == '\\') {
+ O << "\\\\";
+ } else if (isprint(C)) {
+ O << C;
+ } else {
+ switch(C) {
+ case '\b': O << "\\b"; break;
+ case '\f': O << "\\f"; break;
+ case '\n': O << "\\n"; break;
+ case '\r': O << "\\r"; break;
+ case '\t': O << "\\t"; break;
+ default:
+ O << '\\';
+ O << toOctal(C >> 6);
+ O << toOctal(C >> 3);
+ O << toOctal(C >> 0);
+ break;
+ }
+ }
+ }
+ O << "\"";
+}
+
+/// emitGlobalConstant - Print a general LLVM constant to the .s file.
+///
+void AsmPrinter::emitGlobalConstant(const Constant *CV) {
+ const TargetData &TD = TM.getTargetData();
+
+ if (CV->isNullValue() || isa<UndefValue>(CV)) {
+ emitZeros(TD.getTypeSize(CV->getType()));
+ return;
+ } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
+ if (CVA->isString()) {
+ O << AsciiDirective;
+ printAsCString(O, CVA);
+ O << "\n";
+ } else { // Not a string. Print the values in successive locations
+ for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
+ emitGlobalConstant(CVA->getOperand(i));
+ }
+ return;
+ } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
+ // Print the fields in successive locations. Pad to align if needed!
+ const StructLayout *cvsLayout = TD.getStructLayout(CVS->getType());
+ uint64_t sizeSoFar = 0;
+ for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
+ const Constant* field = CVS->getOperand(i);
+
+ // Check if padding is needed and insert one or more 0s.
+ uint64_t fieldSize = TD.getTypeSize(field->getType());
+ uint64_t padSize = ((i == e-1? cvsLayout->StructSize
+ : cvsLayout->MemberOffsets[i+1])
+ - cvsLayout->MemberOffsets[i]) - fieldSize;
+ sizeSoFar += fieldSize + padSize;
+
+ // Now print the actual field value
+ emitGlobalConstant(field);
+
+ // Insert the field padding unless it's zero bytes...
+ emitZeros(padSize);
+ }
+ assert(sizeSoFar == cvsLayout->StructSize &&
+ "Layout of constant struct may be incorrect!");
+ return;
+ } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
+ // FP Constants are printed as integer constants to avoid losing
+ // precision...
+ double Val = CFP->getValue();
+ if (CFP->getType() == Type::DoubleTy) {
+ if (Data64bitsDirective)
+ O << Data64bitsDirective << DoubleToBits(Val) << "\t" << CommentString
+ << " double value: " << Val << "\n";
+ else if (TD.isBigEndian()) {
+ O << Data32bitsDirective << unsigned(DoubleToBits(Val) >> 32)
+ << "\t" << CommentString << " double most significant word "
+ << Val << "\n";
+ O << Data32bitsDirective << unsigned(DoubleToBits(Val))
+ << "\t" << CommentString << " double least significant word "
+ << Val << "\n";
+ } else {
+ O << Data32bitsDirective << unsigned(DoubleToBits(Val))
+ << "\t" << CommentString << " double least significant word " << Val
+ << "\n";
+ O << Data32bitsDirective << unsigned(DoubleToBits(Val) >> 32)
+ << "\t" << CommentString << " double most significant word " << Val
+ << "\n";
+ }
+ return;
+ } else {
+ O << Data32bitsDirective << FloatToBits(Val) << "\t" << CommentString
+ << " float " << Val << "\n";
+ return;
+ }
+ } else if (CV->getType() == Type::ULongTy || CV->getType() == Type::LongTy) {
+ if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
+ uint64_t Val = CI->getRawValue();
+
+ if (Data64bitsDirective)
+ O << Data64bitsDirective << Val << "\n";
+ else if (TD.isBigEndian()) {
+ O << Data32bitsDirective << unsigned(Val >> 32)
+ << "\t" << CommentString << " Double-word most significant word "
+ << Val << "\n";
+ O << Data32bitsDirective << unsigned(Val)
+ << "\t" << CommentString << " Double-word least significant word "
+ << Val << "\n";
+ } else {
+ O << Data32bitsDirective << unsigned(Val)
+ << "\t" << CommentString << " Double-word least significant word "
+ << Val << "\n";
+ O << Data32bitsDirective << unsigned(Val >> 32)
+ << "\t" << CommentString << " Double-word most significant word "
+ << Val << "\n";
+ }
+ return;
+ }
+ }
+
+ const Type *type = CV->getType();
+ switch (type->getTypeID()) {
+ case Type::BoolTyID:
+ case Type::UByteTyID: case Type::SByteTyID:
+ O << Data8bitsDirective;
+ break;
+ case Type::UShortTyID: case Type::ShortTyID:
+ O << Data16bitsDirective;
+ break;
+ case Type::PointerTyID:
+ if (TD.getPointerSize() == 8) {
+ O << Data64bitsDirective;
+ break;
+ }
+ //Fall through for pointer size == int size
+ case Type::UIntTyID: case Type::IntTyID:
+ O << Data32bitsDirective;
+ break;
+ case Type::ULongTyID: case Type::LongTyID:
+ assert(Data64bitsDirective &&"Target cannot handle 64-bit constant exprs!");
+ O << Data64bitsDirective;
+ break;
+ case Type::FloatTyID: case Type::DoubleTyID:
+ assert (0 && "Should have already output floating point constant.");
+ default:
+ assert (0 && "Can't handle printing this type of thing");
+ break;
+ }
+ emitConstantValueOnly(CV);
+ O << "\n";
+}
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