llvm-6502/lib/Target/SparcV9/SparcV9AsmPrinter.cpp
2001-10-20 21:33:50 +00:00

263 lines
7.7 KiB
C++

//===-- EmitAssembly.cpp - Emit Sparc Specific .s File ---------------------==//
//
// This file implements all of the stuff neccesary to output a .s file from
// LLVM. The code in this file assumes that the specified module has already
// been compiled into the internal data structures of the Module.
//
// The entry point of this file is the UltraSparc::emitAssembly method.
//
//===----------------------------------------------------------------------===//
#include "SparcInternals.h"
#include "llvm/Analysis/SlotCalculator.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/BasicBlock.h"
#include "llvm/Method.h"
#include "llvm/Module.h"
#include "llvm/Support/StringExtras.h"
namespace {
class SparcAsmPrinter {
ostream &Out;
SlotCalculator Table;
const UltraSparc &Target;
enum Sections {
Unknown,
Text,
Data,
ReadOnly,
} CurSection;
public:
inline SparcAsmPrinter(ostream &o, const Module *M, const UltraSparc &t)
: Out(o), Table(SlotCalculator(M, true)), Target(t), CurSection(Unknown) {
emitModule(M);
}
private :
void emitModule(const Module *M);
/*
void processSymbolTable(const SymbolTable &ST);
void processConstant(const ConstPoolVal *CPV);
void processGlobal(const GlobalVariable *GV);
*/
void emitMethod(const Method *M);
//void processMethodArgument(const MethodArgument *MA);
void emitBasicBlock(const BasicBlock *BB);
void emitMachineInst(const MachineInstr *MI);
void printOperand(const MachineOperand &Op);
// enterSection - Use this method to enter a different section of the output
// executable. This is used to only output neccesary section transitions.
//
void enterSection(enum Sections S) {
if (S == CurSection) return; // Only switch section if neccesary
CurSection = S;
Out << ".section \".";
switch (S) {
default: assert(0 && "Bad section name!");
case Text: Out << "text"; break;
case Data: Out << "data"; break;
case ReadOnly: Out << "rodata"; break;
}
Out << "\"\n";
}
string getEscapedString(const string &S) {
string Result;
for (unsigned i = 0; i < S.size(); ++i) {
char C = S[i];
if ((C >= 'a' && C <= 'z') || (C >= 'A' && C <= 'Z') ||
(C >= '0' && C <= '9')) {
Result += C;
} else {
Result += '$';
Result += char('0' + ((unsigned char)C >> 4));
Result += char('0' + (C & 0xF));
}
}
return Result;
}
// getID - Return a valid identifier for the specified value. Base it on
// the name of the identifier if possible, use a numbered value based on
// prefix otherwise. FPrefix is always prepended to the output identifier.
//
string getID(const Value *V, const char *Prefix, const char *FPrefix = 0) {
string FP(FPrefix ? FPrefix : ""); // "Forced prefix"
if (V->hasName()) {
return FP + getEscapedString(V->getName());
} else {
assert(Table.getValSlot(V) != -1 && "Value not in value table!");
return FP + string(Prefix) + itostr(Table.getValSlot(V));
}
}
// getID Wrappers - Ensure consistent usage...
string getID(const Method *M) { return getID(M, "anon_method$"); }
string getID(const BasicBlock *BB) {
return getID(BB, "LL", (".L$"+getID(BB->getParent())+"$").c_str());
}
unsigned getOperandMask(unsigned Opcode) {
switch (Opcode) {
case SUBcc: return 1 << 3; // Remove CC argument
case BA: case BRZ: // Remove Arg #0, which is always null or xcc
case BRLEZ: case BRLZ:
case BRNZ: case BRGZ:
case BRGEZ: return 1 << 0;
// case RETURN: return 1 << 1; // Remove Arg #2 which is zero
default: return 0; // By default, don't hack operands...
}
}
};
void SparcAsmPrinter::printOperand(const MachineOperand &Op) {
switch (Op.getOperandType()) {
case MachineOperand::MO_VirtualRegister:
case MachineOperand::MO_CCRegister:
case MachineOperand::MO_MachineRegister: {
int RegNum = (int)Op.getAllocatedRegNum();
// ****this code is temporary till NULL Values are fixed
if (RegNum == 10000) {
Out << "<NULL VALUE>";
} else {
Out << "%" << Target.getRegInfo().getUnifiedRegName(RegNum);
}
break;
}
case MachineOperand::MO_PCRelativeDisp: {
const Value *Val = Op.getVRegValue();
if (!Val) {
Out << "\t<*NULL Value*>";
} else if (const BasicBlock *BB = dyn_cast<const BasicBlock>(Val)) {
Out << getID(BB);
} else if (const Method *M = dyn_cast<const Method>(Val)) {
Out << getID(M);
} else {
Out << "<unknown value=" << Val << ">";
}
break;
}
default:
Out << Op; // use dump field
break;
}
}
void SparcAsmPrinter::emitMachineInst(const MachineInstr *MI) {
unsigned Opcode = MI->getOpCode();
if (TargetInstrDescriptors[Opcode].iclass & M_DUMMY_PHI_FLAG)
return; // IGNORE PHI NODES
Out << "\t" << TargetInstrDescriptors[Opcode].opCodeString << "\t";
switch (Opcode) { // Some opcodes have special syntax...
case JMPL:
assert(MI->getNumOperands() == 3 && "Unexpected JMPL instr!");
printOperand(MI->getOperand(0));
Out << "+";
printOperand(MI->getOperand(1));
Out << ", ";
printOperand(MI->getOperand(2));
Out << endl;
return;
case RETURN:
assert(MI->getNumOperands() == 2 && "Unexpected RETURN instr!");
printOperand(MI->getOperand(0));
Out << "+";
printOperand(MI->getOperand(1));
Out << endl;
return;
default: break;
}
unsigned Mask = getOperandMask(Opcode);
bool NeedComma = false;
for(unsigned OpNum = 0; OpNum < MI->getNumOperands(); ++OpNum) {
if ((1 << OpNum) & Mask) continue; // Ignore this operand?
const MachineOperand &Op = MI->getOperand(OpNum);
if (NeedComma) Out << ", "; // Handle comma outputing
NeedComma = true;
printOperand(Op);
}
Out << endl;
}
void SparcAsmPrinter::emitBasicBlock(const BasicBlock *BB) {
// Emit a label for the basic block
Out << getID(BB) << ":\n";
// Get the vector of machine instructions corresponding to this bb.
const MachineCodeForBasicBlock &MIs = BB->getMachineInstrVec();
MachineCodeForBasicBlock::const_iterator MII = MIs.begin(), MIE = MIs.end();
// Loop over all of the instructions in the basic block...
for (; MII != MIE; ++MII)
emitMachineInst(*MII);
Out << "\n"; // Seperate BB's with newlines
}
void SparcAsmPrinter::emitMethod(const Method *M) {
if (M->isExternal()) return;
// Make sure the slot table has information about this method...
Table.incorporateMethod(M);
string MethName = getID(M);
Out << "!****** Outputing Method: " << MethName << " ******\n";
enterSection(Text);
Out << "\t.align 4\n\t.global\t" << MethName << "\n";
//Out << "\t.type\t" << MethName << ",#function\n";
Out << "\t.type\t" << MethName << ", 2\n";
Out << MethName << ":\n";
// Output code for all of the basic blocks in the method...
for (Method::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
emitBasicBlock(*I);
// Output a .size directive so the debugger knows the extents of the function
Out << ".EndOf$" << MethName << ":\n\t.size " << MethName << ", .EndOf$"
<< MethName << "-" << MethName << endl;
// Put some spaces between the methods
Out << "\n\n";
// Forget all about M.
Table.purgeMethod();
}
void SparcAsmPrinter::emitModule(const Module *M) {
// TODO: Look for a filename annotation on M to emit a .file directive
for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
emitMethod(*I);
}
} // End anonymous namespace
//
// emitAssembly - Output assembly language code (a .s file) for the specified
// method. The specified method must have been compiled before this may be
// used.
//
void UltraSparc::emitAssembly(const Module *M, ostream &Out) const {
SparcAsmPrinter Print(Out, M, *this);
}