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//===-- BlackfinAsmPrinter.cpp - Blackfin 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 GAS-format BLACKFIN assembly language.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "Blackfin.h"
#include "BlackfinInstrInfo.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/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Support/Mangler.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/FormattedStream.h"
using namespace llvm;
STATISTIC(EmittedInsts, "Number of machine instrs printed");
namespace {
class VISIBILITY_HIDDEN BlackfinAsmPrinter : public AsmPrinter {
public:
BlackfinAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
const TargetAsmInfo *TAI, bool V)
: AsmPrinter(O, TM, TAI, V) {}
virtual const char *getPassName() const {
return "Blackfin Assembly Printer";
}
void printOperand(const MachineInstr *MI, int opNum);
void printMemoryOperand(const MachineInstr *MI, int opNum);
void printInstruction(const MachineInstr *MI); // autogenerated.
void emitLinkage(const std::string &n, GlobalValue::LinkageTypes l);
bool runOnMachineFunction(MachineFunction &F);
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode);
bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode);
void PrintGlobalVariable(const GlobalVariable* GVar);
};
} // end of anonymous namespace
#include "BlackfinGenAsmWriter.inc"
extern "C" void LLVMInitializeBlackfinAsmPrinter() {
RegisterAsmPrinter<BlackfinAsmPrinter> X(TheBlackfinTarget);
}
void BlackfinAsmPrinter::emitLinkage(const std::string &name,
GlobalValue::LinkageTypes l) {
switch (l) {
default: llvm_unreachable("Unknown linkage type!");
case GlobalValue::InternalLinkage: // Symbols default to internal.
case GlobalValue::PrivateLinkage:
case GlobalValue::LinkerPrivateLinkage:
break;
case GlobalValue::ExternalLinkage:
O << TAI->getGlobalDirective() << name << "\n";
break;
case GlobalValue::LinkOnceAnyLinkage:
case GlobalValue::LinkOnceODRLinkage:
case GlobalValue::WeakAnyLinkage:
case GlobalValue::WeakODRLinkage:
O << TAI->getGlobalDirective() << name << "\n";
O << TAI->getWeakDefDirective() << name << "\n";
break;
}
}
void BlackfinAsmPrinter::PrintGlobalVariable(const GlobalVariable* GV) {
const TargetData *TD = TM.getTargetData();
if (!GV->hasInitializer() || EmitSpecialLLVMGlobal(GV))
return;
std::string name = Mang->getMangledName(GV);
Constant *C = GV->getInitializer();
SwitchToSection(getObjFileLowering().SectionForGlobal(GV, Mang, TM));
emitLinkage(name, GV->getLinkage());
EmitAlignment(TD->getPreferredAlignmentLog(GV), GV);
printVisibility(name, GV->getVisibility());
O << "\t.type " << name << ", STT_OBJECT\n";
O << "\t.size " << name << ',' << TD->getTypeAllocSize(C->getType()) << '\n';
O << name << ":\n";
EmitGlobalConstant(C);
}
/// runOnMachineFunction - This uses the printInstruction()
/// method to print assembly for each instruction.
///
bool BlackfinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
SetupMachineFunction(MF);
EmitConstantPool(MF.getConstantPool());
EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
const Function *F = MF.getFunction();
SwitchToSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
EmitAlignment(2, F);
emitLinkage(CurrentFnName, F->getLinkage());
printVisibility(CurrentFnName, F->getVisibility());
O << "\t.type\t" << CurrentFnName << ", STT_FUNC\n"
<< CurrentFnName << ":\n";
if (DW)
DW->BeginFunction(&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.
printInstruction(II);
++EmittedInsts;
}
}
O << "\t.size " << CurrentFnName << ", .-" << CurrentFnName << "\n";
if (DW)
DW->EndFunction(&MF);
return false;
}
void BlackfinAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
const MachineOperand &MO = MI->getOperand (opNum);
const TargetRegisterInfo &RI = *TM.getRegisterInfo();
switch (MO.getType()) {
case MachineOperand::MO_Register:
assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
"Virtual registers should be already mapped!");
O << RI.get(MO.getReg()).AsmName;
break;
case MachineOperand::MO_Immediate:
O << MO.getImm();
break;
case MachineOperand::MO_MachineBasicBlock:
printBasicBlockLabel(MO.getMBB(), false, false, false);
return;
case MachineOperand::MO_GlobalAddress:
O << Mang->getMangledName(MO.getGlobal());
printOffset(MO.getOffset());
break;
case MachineOperand::MO_ExternalSymbol:
O << Mang->makeNameProper(MO.getSymbolName());
break;
case MachineOperand::MO_ConstantPoolIndex:
O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
<< MO.getIndex();
break;
case MachineOperand::MO_JumpTableIndex:
O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
<< '_' << MO.getIndex();
break;
default:
llvm_unreachable("<unknown operand type>");
break;
}
}
void BlackfinAsmPrinter::printMemoryOperand(const MachineInstr *MI, int opNum) {
printOperand(MI, opNum);
if (MI->getOperand(opNum+1).isImm() && MI->getOperand(opNum+1).getImm() == 0)
return;
O << " + ";
printOperand(MI, opNum+1);
}
/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool BlackfinAsmPrinter::PrintAsmOperand(const MachineInstr *MI,
unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode) {
if (ExtraCode && ExtraCode[0]) {
if (ExtraCode[1] != 0) return true; // Unknown modifier.
switch (ExtraCode[0]) {
default: return true; // Unknown modifier.
case 'r':
break;
}
}
printOperand(MI, OpNo);
return false;
}
bool BlackfinAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode) {
if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier
O << '[';
printOperand(MI, OpNo);
O << ']';
return false;
}
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