llvm-6502/lib/Target/Alpha/AlphaAsmPrinter.cpp
2007-02-13 23:41:16 +00:00

298 lines
8.9 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.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#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/TargetAsmInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Mangler.h"
#include "llvm/ADT/Statistic.h"
using namespace llvm;
STATISTIC(EmittedInsts, "Number of machine instrs printed");
namespace {
struct VISIBILITY_HIDDEN AlphaAsmPrinter : public AsmPrinter {
/// Unique incrementer for label values for referencing Global values.
///
AlphaAsmPrinter(std::ostream &o, TargetMachine &tm, const TargetAsmInfo *T)
: AsmPrinter(o, tm, T) {
}
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);
bool runOnMachineFunction(MachineFunction &F);
bool doInitialization(Module &M);
bool doFinalization(Module &M);
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode);
bool PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode);
};
} // 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, tm.getTargetAsmInfo());
}
#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();
assert(MO.getImmedValue() < (1 << 30));
} else {
printOp(MO);
}
}
void AlphaAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) {
const MRegisterInfo &RI = *TM.getRegisterInfo();
switch (MO.getType()) {
case MachineOperand::MO_Register:
O << RI.get(MO.getReg()).Name;
return;
case MachineOperand::MO_Immediate:
cerr << "printOp() does not handle immediate values\n";
abort();
return;
case MachineOperand::MO_MachineBasicBlock:
printBasicBlockLabel(MO.getMachineBasicBlock());
return;
case MachineOperand::MO_ConstantPoolIndex:
O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
<< MO.getConstantPoolIndex();
return;
case MachineOperand::MO_ExternalSymbol:
O << MO.getSymbolName();
return;
case MachineOperand::MO_GlobalAddress: {
GlobalValue *GV = MO.getGlobal();
O << Mang->getValueName(GV);
if (GV->isDeclaration() && GV->hasExternalWeakLinkage())
ExtWeakSymbols.insert(GV);
return;
}
case MachineOperand::MO_JumpTableIndex:
O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
<< '_' << MO.getJumpTableIndex();
return;
default:
O << "<unknown operand type: " << MO.getType() << ">";
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 jump tables referenced by the function
EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
// Print out labels for the function.
const Function *F = MF.getFunction();
SwitchToTextSection(getSectionForFunction(*F).c_str(), 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 << TAI->getWeakRefDirective() << 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) {
if (I != MF.begin()) {
printBasicBlockLabel(I, true);
O << '\n';
}
for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
II != E; ++II) {
// Print the assembly for the instruction.
++EmittedInsts;
O << "\t";
if (!printInstruction(II)) {
assert(0 && "Unhandled instruction in asm writer!");
abort();
}
}
}
O << "\t.end " << CurrentFnName << "\n";
// We didn't modify anything.
return false;
}
bool AlphaAsmPrinter::doInitialization(Module &M)
{
if(TM.getSubtarget<AlphaSubtarget>().hasCT())
O << "\t.arch ev6\n"; //This might need to be ev67, so leave this test here
else
O << "\t.arch ev6\n";
O << "\t.set noat\n";
AsmPrinter::doInitialization(M);
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()) continue; // 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;
std::string name = Mang->getValueName(I);
Constant *C = I->getInitializer();
unsigned Size = TD->getTypeSize(C->getType());
unsigned Align = TD->getPreferredAlignmentLog(I);
//1: hidden?
if (I->hasHiddenVisibility())
O << TAI->getHiddenDirective() << name << "\n";
//2: kind
switch (I->getLinkage()) {
case GlobalValue::LinkOnceLinkage:
case GlobalValue::WeakLinkage:
O << TAI->getWeakRefDirective() << name << '\n';
break;
case GlobalValue::AppendingLinkage:
case GlobalValue::ExternalLinkage:
O << "\t.globl " << name << "\n";
break;
case GlobalValue::InternalLinkage:
break;
default:
assert(0 && "Unknown linkage type!");
cerr << "Unknown linkage type!\n";
abort();
}
//3: Section (if changed)
if (I->hasSection() &&
(I->getSection() == ".ctors" ||
I->getSection() == ".dtors")) {
std::string SectionName = ".section\t" + I->getSection()
+ ",\"aw\",@progbits";
SwitchToDataSection(SectionName.c_str());
} else {
if (C->isNullValue())
SwitchToDataSection("\t.section\t.bss", I);
else
SwitchToDataSection("\t.section\t.data", I);
}
//4: Type, Size, Align
O << "\t.type\t" << name << ", @object\n";
O << "\t.size\t" << name << ", " << Size << "\n";
EmitAlignment(Align, I);
O << name << ":\n";
// If the initializer is a extern weak symbol, remember to emit the weak
// reference!
if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
if (GV->hasExternalWeakLinkage())
ExtWeakSymbols.insert(GV);
EmitGlobalConstant(C);
O << '\n';
}
AsmPrinter::doFinalization(M);
return false;
}
/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool AlphaAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode) {
printOperand(MI, OpNo);
return false;
}
bool AlphaAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode) {
if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier.
O << "0(";
printOperand(MI, OpNo);
O << ")";
return false;
}