llvm-mirror/lib/VMCore/AsmWriter.cpp

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2001-06-06 20:29:01 +00:00
//===-- Writer.cpp - Library for Printing VM assembly files ------*- C++ -*--=//
//
// This library implements the functionality defined in llvm/Assembly/Writer.h
//
// This library uses the Analysis library to figure out offsets for
// variables in the method tables...
//
// TODO: print out the type name instead of the full type if a particular type
// is in the symbol table...
//
//===----------------------------------------------------------------------===//
#include "llvm/Assembly/Writer.h"
#include "llvm/Analysis/SlotCalculator.h"
#include "llvm/Module.h"
#include "llvm/Method.h"
#include "llvm/BasicBlock.h"
#include "llvm/ConstPoolVals.h"
#include "llvm/iOther.h"
#include "llvm/iMemory.h"
class AssemblyWriter : public ModuleAnalyzer {
ostream &Out;
SlotCalculator &Table;
public:
inline AssemblyWriter(ostream &o, SlotCalculator &Tab) : Out(o), Table(Tab) {
}
inline void write(const Module *M) { processModule(M); }
inline void write(const Method *M) { processMethod(M); }
inline void write(const BasicBlock *BB) { processBasicBlock(BB); }
inline void write(const Instruction *I) { processInstruction(I); }
inline void write(const ConstPoolVal *CPV) { processConstant(CPV); }
protected:
virtual bool visitMethod(const Method *M);
virtual bool processConstPool(const ConstantPool &CP, bool isMethod);
virtual bool processConstant(const ConstPoolVal *CPV);
virtual bool processMethod(const Method *M);
virtual bool processMethodArgument(const MethodArgument *MA);
virtual bool processBasicBlock(const BasicBlock *BB);
virtual bool processInstruction(const Instruction *I);
private :
void writeOperand(const Value *Op, bool PrintType, bool PrintName = true);
};
// visitMethod - This member is called after the above two steps, visting each
// method, because they are effectively values that go into the constant pool.
//
bool AssemblyWriter::visitMethod(const Method *M) {
return false;
}
bool AssemblyWriter::processConstPool(const ConstantPool &CP, bool isMethod) {
// Done printing arguments...
if (isMethod) Out << ")\n";
ModuleAnalyzer::processConstPool(CP, isMethod);
if (isMethod)
Out << "begin";
else
Out << "implementation\n";
return false;
}
// processConstant - Print out a constant pool entry...
//
bool AssemblyWriter::processConstant(const ConstPoolVal *CPV) {
Out << "\t";
// Print out name if it exists...
if (CPV->hasName())
Out << "%" << CPV->getName() << " = ";
// Print out the opcode...
Out << CPV->getType();
// Write the value out now...
writeOperand(CPV, false, false);
if (!CPV->hasName() && CPV->getType() != Type::VoidTy) {
int Slot = Table.getValSlot(CPV); // Print out the def slot taken...
Out << "\t\t; <" << CPV->getType() << ">:";
if (Slot >= 0) Out << Slot;
else Out << "<badref>";
}
Out << endl;
return false;
}
// processMethod - Process all aspects of a method.
//
bool AssemblyWriter::processMethod(const Method *M) {
// Print out the return type and name...
Out << "\n" << M->getReturnType() << " \"" << M->getName() << "\"(";
Table.incorporateMethod(M);
ModuleAnalyzer::processMethod(M);
Table.purgeMethod();
Out << "end\n";
return false;
}
// processMethodArgument - This member is called for every argument that
// is passed into the method. Simply print it out
//
bool AssemblyWriter::processMethodArgument(const MethodArgument *Arg) {
// Insert commas as we go... the first arg doesn't get a comma
if (Arg != Arg->getParent()->getArgumentList().front()) Out << ", ";
// Output type...
Out << Arg->getType();
// Output name, if available...
if (Arg->hasName())
Out << " %" << Arg->getName();
else if (Table.getValSlot(Arg) < 0)
Out << "<badref>";
return false;
}
// processBasicBlock - This member is called for each basic block in a methd.
//
bool AssemblyWriter::processBasicBlock(const BasicBlock *BB) {
if (BB->hasName()) { // Print out the label if it exists...
Out << "\n" << BB->getName() << ":\n";
} else {
int Slot = Table.getValSlot(BB);
Out << "\t\t\t\t; <label>:";
if (Slot >= 0)
Out << Slot << endl; // Extra newline seperates out label's
else
Out << "<badref>\n";
}
ModuleAnalyzer::processBasicBlock(BB);
return false;
}
// processInstruction - This member is called for each Instruction in a methd.
//
bool AssemblyWriter::processInstruction(const Instruction *I) {
Out << "\t";
// Print out name if it exists...
if (I && I->hasName())
Out << "%" << I->getName() << " = ";
// Print out the opcode...
Out << I->getOpcode();
// Print out the type of the operands...
const Value *Operand = I->getOperand(0);
// Special case conditional branches to swizzle the condition out to the front
if (I->getInstType() == Instruction::Br && I->getOperand(1)) {
writeOperand(I->getOperand(2), true);
Out << ",";
writeOperand(Operand, true);
Out << ",";
writeOperand(I->getOperand(1), true);
} else if (I->getInstType() == Instruction::Switch) {
// Special case switch statement to get formatting nice and correct...
writeOperand(Operand , true); Out << ",";
writeOperand(I->getOperand(1), true); Out << " [";
for (unsigned op = 2; (Operand = I->getOperand(op)); op += 2) {
Out << "\n\t\t";
writeOperand(Operand, true); Out << ",";
writeOperand(I->getOperand(op+1), true);
}
Out << "\n\t]";
} else if (I->getInstType() == Instruction::Ret && !Operand) {
Out << " void";
} else if (I->getInstType() == Instruction::Call) {
writeOperand(Operand, true);
Out << "(";
Operand = I->getOperand(1);
if (Operand) writeOperand(Operand, true);
for (unsigned op = 2; (Operand = I->getOperand(op)); ++op) {
Out << ",";
writeOperand(Operand, true);
}
Out << " )";
} else if (I->getInstType() == Instruction::Malloc ||
I->getInstType() == Instruction::Alloca) {
Out << " " << ((const PointerType*)((ConstPoolType*)Operand)
->getValue())->getValueType();
if ((Operand = I->getOperand(1))) {
Out << ","; writeOperand(Operand, true);
}
} else if (Operand) { // Print the normal way...
// PrintAllTypes - Instructions who have operands of all the same type
// omit the type from all but the first operand. If the instruction has
// different type operands (for example br), then they are all printed.
bool PrintAllTypes = false;
const Type *TheType = Operand->getType();
unsigned i;
for (i = 1; (Operand = I->getOperand(i)); i++) {
if (Operand->getType() != TheType) {
PrintAllTypes = true; // We have differing types! Print them all!
break;
}
}
if (!PrintAllTypes)
Out << " " << I->getOperand(0)->getType();
for (unsigned i = 0; (Operand = I->getOperand(i)); i++) {
if (i) Out << ",";
writeOperand(Operand, PrintAllTypes);
}
}
// Print a little comment after the instruction indicating which slot it
// occupies.
//
if (!I->hasName() && I->getType() != Type::VoidTy) {
int Slot = Table.getValSlot(I); // Print out the def slot taken...
Out << "\t\t; <" << I->getType() << ">:";
if (Slot >= 0) Out << Slot;
else Out << "<badref>";
Out << "\t[#uses=" << I->use_size() << "]"; // Output # uses
}
Out << endl;
return false;
}
void AssemblyWriter::writeOperand(const Value *Operand, bool PrintType,
bool PrintName) {
if (PrintType)
Out << " " << Operand->getType();
if (Operand->hasName() && PrintName) {
Out << " %" << Operand->getName();
} else {
int Slot = Table.getValSlot(Operand);
if (Operand->getValueType() == Value::ConstantVal) {
Out << " " << ((ConstPoolVal*)Operand)->getStrValue();
} else {
if (Slot >= 0) Out << " %" << Slot;
else if (PrintName)
Out << "<badref>"; // Not embeded into a location?
}
}
}
//===----------------------------------------------------------------------===//
// External Interface declarations
//===----------------------------------------------------------------------===//
void WriteToAssembly(const Module *M, ostream &o) {
if (M == 0) { o << "<null> module\n"; return; }
SlotCalculator SlotTable(M, true);
AssemblyWriter W(o, SlotTable);
W.write(M);
}
void WriteToAssembly(const Method *M, ostream &o) {
if (M == 0) { o << "<null> method\n"; return; }
SlotCalculator SlotTable(M->getParent(), true);
AssemblyWriter W(o, SlotTable);
W.write(M);
}
void WriteToAssembly(const BasicBlock *BB, ostream &o) {
if (BB == 0) { o << "<null> basic block\n"; return; }
SlotCalculator SlotTable(BB->getParent(), true);
AssemblyWriter W(o, SlotTable);
W.write(BB);
}
void WriteToAssembly(const ConstPoolVal *CPV, ostream &o) {
if (CPV == 0) { o << "<null> constant pool value\n"; return; }
SlotCalculator *SlotTable;
// A Constant pool value may have a parent that is either a method or a
// module. Untangle this now...
//
if (CPV->getParent() == 0 ||
CPV->getParent()->getValueType() == Value::MethodVal) {
SlotTable = new SlotCalculator((Method*)CPV->getParent(), true);
} else {
assert(CPV->getParent()->getValueType() == Value::ModuleVal);
SlotTable = new SlotCalculator((Module*)CPV->getParent(), true);
}
AssemblyWriter W(o, *SlotTable);
W.write(CPV);
delete SlotTable;
}
void WriteToAssembly(const Instruction *I, ostream &o) {
if (I == 0) { o << "<null> instruction\n"; return; }
SlotCalculator SlotTable(I->getParent() ? I->getParent()->getParent() : 0,
true);
AssemblyWriter W(o, SlotTable);
W.write(I);
}