llvm-6502/lib/Target/Alpha/AlphaAsmPrinter.cpp
2006-05-09 04:59:56 +00:00

267 lines
8.4 KiB
C++

//===-- AlphaAsmPrinter.cpp - Alpha LLVM assembly writer ------------------===//
//
// 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 contains a printer that converts from our internal representation
// of machine-dependent LLVM code to GAS-format Alpha assembly language.
//
//===----------------------------------------------------------------------===//
#include "Alpha.h"
#include "AlphaInstrInfo.h"
#include "AlphaTargetMachine.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Mangler.h"
#include "llvm/ADT/Statistic.h"
#include <iostream>
using namespace llvm;
namespace {
Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
struct AlphaAsmPrinter : public AsmPrinter {
/// Unique incrementer for label values for referencing Global values.
///
unsigned LabelNumber;
AlphaAsmPrinter(std::ostream &o, TargetMachine &tm)
: AsmPrinter(o, tm), LabelNumber(0) {
AlignmentIsInBytes = false;
PrivateGlobalPrefix = "$";
}
/// We name each basic block in a Function with a unique number, so
/// that we can consistently refer to them later. This is cleared
/// at the beginning of each call to runOnMachineFunction().
///
typedef std::map<const Value *, unsigned> ValueMapTy;
ValueMapTy NumberForBB;
std::string CurSection;
virtual const char *getPassName() const {
return "Alpha Assembly Printer";
}
bool printInstruction(const MachineInstr *MI);
void printOp(const MachineOperand &MO, bool IsCallOp = false);
void printOperand(const MachineInstr *MI, int opNum);
void printBaseOffsetPair (const MachineInstr *MI, int i, bool brackets=true);
void printMachineInstruction(const MachineInstr *MI);
bool runOnMachineFunction(MachineFunction &F);
bool doInitialization(Module &M);
bool doFinalization(Module &M);
};
} // end of anonymous namespace
/// createAlphaCodePrinterPass - Returns a pass that prints the Alpha
/// assembly code for a MachineFunction to the given output stream,
/// using the given target machine description. This should work
/// regardless of whether the function is in SSA form.
///
FunctionPass *llvm::createAlphaCodePrinterPass (std::ostream &o,
TargetMachine &tm) {
return new AlphaAsmPrinter(o, tm);
}
#include "AlphaGenAsmWriter.inc"
void AlphaAsmPrinter::printOperand(const MachineInstr *MI, int opNum)
{
const MachineOperand &MO = MI->getOperand(opNum);
if (MO.getType() == MachineOperand::MO_Register) {
assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??");
O << TM.getRegisterInfo()->get(MO.getReg()).Name;
} else if (MO.isImmediate()) {
O << MO.getImmedValue();
} else {
printOp(MO);
}
}
void AlphaAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) {
const MRegisterInfo &RI = *TM.getRegisterInfo();
int new_symbol;
switch (MO.getType()) {
case MachineOperand::MO_Register:
O << RI.get(MO.getReg()).Name;
return;
case MachineOperand::MO_Immediate:
std::cerr << "printOp() does not handle immediate values\n";
abort();
return;
case MachineOperand::MO_MachineBasicBlock:
printBasicBlockLabel(MO.getMachineBasicBlock());
return;
case MachineOperand::MO_ConstantPoolIndex:
O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << "_"
<< MO.getConstantPoolIndex();
return;
case MachineOperand::MO_ExternalSymbol:
O << MO.getSymbolName();
return;
case MachineOperand::MO_GlobalAddress:
O << Mang->getValueName(MO.getGlobal());
return;
default:
O << "<unknown operand type: " << MO.getType() << ">";
return;
}
}
/// printMachineInstruction -- Print out a single Alpha MI to
/// the current output stream.
///
void AlphaAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
++EmittedInsts;
if (printInstruction(MI))
return; // Printer was automatically generated
assert(0 && "Unhandled instruction in asm writer!");
abort();
return;
}
/// runOnMachineFunction - This uses the printMachineInstruction()
/// method to print assembly for each instruction.
///
bool AlphaAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
SetupMachineFunction(MF);
O << "\n\n";
// Print out constants referenced by the function
EmitConstantPool(MF.getConstantPool());
// Print out labels for the function.
const Function *F = MF.getFunction();
SwitchToTextSection(".text", F);
EmitAlignment(4, F);
switch (F->getLinkage()) {
default: assert(0 && "Unknown linkage type!");
case Function::InternalLinkage: // Symbols default to internal.
break;
case Function::ExternalLinkage:
O << "\t.globl " << CurrentFnName << "\n";
break;
case Function::WeakLinkage:
case Function::LinkOnceLinkage:
O << "\t.weak " << CurrentFnName << "\n";
break;
}
O << "\t.ent " << CurrentFnName << "\n";
O << CurrentFnName << ":\n";
// Print out code for the function.
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
I != E; ++I) {
printBasicBlockLabel(I, true);
O << '\n';
for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
II != E; ++II) {
// Print the assembly for the instruction.
O << "\t";
printMachineInstruction(II);
}
}
++LabelNumber;
O << "\t.end " << CurrentFnName << "\n";
// We didn't modify anything.
return false;
}
bool AlphaAsmPrinter::doInitialization(Module &M)
{
AsmPrinter::doInitialization(M);
if(TM.getSubtarget<AlphaSubtarget>().hasF2I()
|| TM.getSubtarget<AlphaSubtarget>().hasCT())
O << "\t.arch ev6\n";
else
O << "\t.arch ev56\n";
O << "\t.set noat\n";
return false;
}
bool AlphaAsmPrinter::doFinalization(Module &M) {
const TargetData *TD = TM.getTargetData();
for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
if (I->hasInitializer()) { // External global require no code
// Check to see if this is a special global used by LLVM, if so, emit it.
if (EmitSpecialLLVMGlobal(I))
continue;
O << "\n\n";
std::string name = Mang->getValueName(I);
Constant *C = I->getInitializer();
unsigned Size = TD->getTypeSize(C->getType());
// unsigned Align = TD->getTypeAlignmentShift(C->getType());
unsigned Align = getPreferredAlignmentLog(I);
if (C->isNullValue() &&
(I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
I->hasWeakLinkage() /* FIXME: Verify correct */)) {
SwitchToDataSection("\t.section .data", I);
if (I->hasInternalLinkage())
O << "\t.local " << name << "\n";
O << "\t.comm " << name << "," << TD->getTypeSize(C->getType())
<< "," << (1 << Align)
<< "\n";
} else {
switch (I->getLinkage()) {
case GlobalValue::LinkOnceLinkage:
case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
// Nonnull linkonce -> weak
O << "\t.weak " << name << "\n";
O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
SwitchToDataSection("", I);
break;
case GlobalValue::AppendingLinkage:
// FIXME: appending linkage variables should go into a section of
// their name or something. For now, just emit them as external.
case GlobalValue::ExternalLinkage:
// If external or appending, declare as a global symbol
O << "\t.globl " << name << "\n";
// FALL THROUGH
case GlobalValue::InternalLinkage:
SwitchToDataSection(C->isNullValue() ? "\t.section .bss" :
"\t.section .data", I);
break;
case GlobalValue::GhostLinkage:
std::cerr << "GhostLinkage cannot appear in AlphaAsmPrinter!\n";
abort();
}
EmitAlignment(Align);
O << "\t.type " << name << ",@object\n";
O << "\t.size " << name << "," << Size << "\n";
O << name << ":\n";
EmitGlobalConstant(C);
}
}
AsmPrinter::doFinalization(M);
return false;
}