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//===-- ARMAsmPrinter.cpp - ARM LLVM assembly writer ----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the "Instituto Nokia de Tecnologia" 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 ARM assembly language.
//
//===----------------------------------------------------------------------===//
#include "ARM.h"
#include "ARMInstrInfo.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Mangler.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/MathExtras.h"
#include <cctype>
#include <iostream>
using namespace llvm;
namespace {
Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
struct ARMAsmPrinter : public AsmPrinter {
ARMAsmPrinter(std::ostream &O, TargetMachine &TM) : AsmPrinter(O, TM) {
Data16bitsDirective = "\t.half\t";
Data32bitsDirective = "\t.word\t";
Data64bitsDirective = 0;
ZeroDirective = "\t.skip\t";
CommentString = "!";
ConstantPoolSection = "\t.section \".rodata\",#alloc\n";
AlignmentIsInBytes = false;
}
/// 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;
virtual const char *getPassName() const {
return "ARM Assembly Printer";
}
void printMemRegImm(const MachineInstr *MI, unsigned OpNo) {
printOperand(MI, OpNo + 1);
O << ", ";
printOperand(MI, OpNo);
}
void printOperand(const MachineInstr *MI, int opNum);
void printMemOperand(const MachineInstr *MI, int opNum,
const char *Modifier = 0);
void printCCOperand(const MachineInstr *MI, int opNum);
bool printInstruction(const MachineInstr *MI); // autogenerated.
bool runOnMachineFunction(MachineFunction &F);
bool doInitialization(Module &M);
bool doFinalization(Module &M);
};
} // end of anonymous namespace
#include "ARMGenAsmWriter.inc"
/// createARMCodePrinterPass - Returns a pass that prints the ARM
/// 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::createARMCodePrinterPass(std::ostream &o,
TargetMachine &tm) {
return new ARMAsmPrinter(o, tm);
}
/// runOnMachineFunction - This uses the printMachineInstruction()
/// method to print assembly for each instruction.
///
bool ARMAsmPrinter::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());
// Print out labels for the function.
const Function *F = MF.getFunction();
switch (F->getLinkage()) {
default: assert(0 && "Unknown linkage type!");
case Function::InternalLinkage:
SwitchToTextSection("\t.text", F);
break;
case Function::ExternalLinkage:
SwitchToTextSection("\t.text", F);
O << "\t.globl\t" << CurrentFnName << "\n";
break;
case Function::WeakLinkage:
case Function::LinkOnceLinkage:
assert(0 && "Not implemented");
break;
}
EmitAlignment(2, F);
O << CurrentFnName << ":\n";
// 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 (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.
O << "\t";
printInstruction(II);
}
}
return false;
}
void ARMAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
const MachineOperand &MO = MI->getOperand (opNum);
const MRegisterInfo &RI = *TM.getRegisterInfo();
switch (MO.getType()) {
case MachineOperand::MO_Register:
if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
O << LowercaseString (RI.get(MO.getReg()).Name);
else
assert(0 && "not implemented");
break;
case MachineOperand::MO_Immediate:
O << "#" << (int)MO.getImmedValue();
break;
case MachineOperand::MO_MachineBasicBlock:
assert(0 && "not implemented");
abort();
return;
case MachineOperand::MO_GlobalAddress:
assert(0 && "not implemented");
abort();
break;
case MachineOperand::MO_ExternalSymbol:
assert(0 && "not implemented");
abort();
break;
case MachineOperand::MO_ConstantPoolIndex:
assert(0 && "not implemented");
abort();
break;
default:
O << "<unknown operand type>"; abort (); break;
}
}
void ARMAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
const char *Modifier) {
assert(0 && "not implemented");
}
void ARMAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
assert(0 && "not implemented");
}
bool ARMAsmPrinter::doInitialization(Module &M) {
Mang = new Mangler(M);
return false; // success
}
bool ARMAsmPrinter::doFinalization(Module &M) {
AsmPrinter::doFinalization(M);
return false; // success
}
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