llvm-6502/lib/Target/MSP430/MSP430AsmPrinter.cpp

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//===-- MSP430AsmPrinter.cpp - MSP430 LLVM assembly writer ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file 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 the MSP430 assembly language.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "MSP430.h"
#include "MSP430InstrInfo.h"
#include "MSP430TargetMachine.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
STATISTIC(EmittedInsts, "Number of machine instrs printed");
namespace {
class VISIBILITY_HIDDEN MSP430AsmPrinter : public AsmPrinter {
public:
MSP430AsmPrinter(raw_ostream &O, MSP430TargetMachine &TM,
const TargetAsmInfo *TAI,
CodeGenOpt::Level OL, bool V)
: AsmPrinter(O, TM, TAI, OL, V) {}
virtual const char *getPassName() const {
return "MSP430 Assembly Printer";
}
void printOperand(const MachineInstr *MI, int OpNum,
const char* Modifier = 0);
void printSrcMemOperand(const MachineInstr *MI, int OpNum,
const char* Modifier = 0);
void printCCOperand(const MachineInstr *MI, int OpNum);
bool printInstruction(const MachineInstr *MI); // autogenerated.
void printMachineInstruction(const MachineInstr * MI);
void emitFunctionHeader(const MachineFunction &MF);
bool runOnMachineFunction(MachineFunction &F);
bool doInitialization(Module &M);
bool doFinalization(Module &M);
void getAnalysisUsage(AnalysisUsage &AU) const {
AsmPrinter::getAnalysisUsage(AU);
AU.setPreservesAll();
}
};
} // end of anonymous namespace
#include "MSP430GenAsmWriter.inc"
/// createMSP430CodePrinterPass - Returns a pass that prints the MSP430
/// 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::createMSP430CodePrinterPass(raw_ostream &o,
MSP430TargetMachine &tm,
CodeGenOpt::Level OptLevel,
bool verbose) {
return new MSP430AsmPrinter(o, tm, tm.getTargetAsmInfo(), OptLevel, verbose);
}
bool MSP430AsmPrinter::doInitialization(Module &M) {
Mang = new Mangler(M, "", TAI->getPrivateGlobalPrefix());
return false; // success
}
bool MSP430AsmPrinter::doFinalization(Module &M) {
return AsmPrinter::doFinalization(M);
}
void MSP430AsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
const Function *F = MF.getFunction();
SwitchToSection(TAI->SectionForGlobal(F));
unsigned FnAlign = 4;
if (F->hasFnAttr(Attribute::OptimizeForSize))
FnAlign = 1;
EmitAlignment(FnAlign, F);
switch (F->getLinkage()) {
default: assert(0 && "Unknown linkage type!");
case Function::InternalLinkage: // Symbols default to internal.
case Function::PrivateLinkage:
break;
case Function::ExternalLinkage:
O << "\t.globl\t" << CurrentFnName << '\n';
break;
case Function::LinkOnceAnyLinkage:
case Function::LinkOnceODRLinkage:
case Function::WeakAnyLinkage:
case Function::WeakODRLinkage:
O << "\t.weak\t" << CurrentFnName << '\n';
break;
}
printVisibility(CurrentFnName, F->getVisibility());
O << "\t.type\t" << CurrentFnName << ",@function\n"
<< CurrentFnName << ":\n";
}
bool MSP430AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
SetupMachineFunction(MF);
O << "\n\n";
// Print the 'header' of function
emitFunctionHeader(MF);
// Print out code for the function.
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
I != E; ++I) {
// Print a label for the basic block.
if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
// This is an entry block or a block that's only reachable via a
// fallthrough edge. In non-VerboseAsm mode, don't print the label.
} else {
printBasicBlockLabel(I, true, true, VerboseAsm);
O << '\n';
}
for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
II != E; ++II)
// Print the assembly for the instruction.
printMachineInstruction(II);
}
if (TAI->hasDotTypeDotSizeDirective())
O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
O.flush();
// We didn't modify anything
return false;
}
void MSP430AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
++EmittedInsts;
// Call the autogenerated instruction printer routines.
if (printInstruction(MI))
return;
assert(0 && "Should not happen");
}
void MSP430AsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
const char* Modifier) {
const MachineOperand &MO = MI->getOperand(OpNum);
switch (MO.getType()) {
case MachineOperand::MO_Register:
assert (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
"Virtual registers should be already mapped!");
O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
return;
case MachineOperand::MO_Immediate:
if (!Modifier || strcmp(Modifier, "nohash"))
O << '#';
O << MO.getImm();
return;
case MachineOperand::MO_MachineBasicBlock:
printBasicBlockLabel(MO.getMBB());
return;
case MachineOperand::MO_GlobalAddress: {
bool isMemOp = Modifier && !strcmp(Modifier, "mem");
bool isCallOp = Modifier && !strcmp(Modifier, "call");
std::string Name = Mang->getValueName(MO.getGlobal());
assert(MO.getOffset() == 0 && "No offsets allowed!");
if (isCallOp)
O << '#';
else if (isMemOp)
O << '&';
O << Name;
return;
}
case MachineOperand::MO_ExternalSymbol: {
bool isCallOp = Modifier && !strcmp(Modifier, "call");
std::string Name(TAI->getGlobalPrefix());
Name += MO.getSymbolName();
if (isCallOp)
O << '#';
O << Name;
return;
}
default:
assert(0 && "Not implemented yet!");
}
}
void MSP430AsmPrinter::printSrcMemOperand(const MachineInstr *MI, int OpNum,
const char* Modifier) {
const MachineOperand &Base = MI->getOperand(OpNum);
const MachineOperand &Disp = MI->getOperand(OpNum+1);
if (Base.isGlobal())
printOperand(MI, OpNum, "mem");
else if (Disp.isImm() && !Base.getReg())
printOperand(MI, OpNum);
else if (Base.getReg()) {
if (Disp.getImm()) {
printOperand(MI, OpNum + 1, "nohash");
O << '(';
printOperand(MI, OpNum);
O << ')';
} else {
O << '@';
printOperand(MI, OpNum);
}
} else
assert(0 && "Unsupported memory operand");
}
void MSP430AsmPrinter::printCCOperand(const MachineInstr *MI, int OpNum) {
unsigned CC = MI->getOperand(OpNum).getImm();
switch (CC) {
default:
assert(0 && "Unsupported CC code");
break;
case MSP430::COND_E:
O << "eq";
break;
case MSP430::COND_NE:
O << "ne";
break;
case MSP430::COND_HS:
O << "hs";
break;
case MSP430::COND_LO:
O << "lo";
break;
case MSP430::COND_GE:
O << "ge";
break;
case MSP430::COND_L:
O << 'l';
break;
}
}