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llvm-mirror/lib/Target/IA64/IA64AsmPrinter.cpp
Chris Lattner 75e572ab20 implement and use getSectionForFunction 
llvm-svn: 30741
2006-10-05 02:51:36 +00:00

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//===-- IA64AsmPrinter.cpp - Print out IA64 LLVM as assembly --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Duraid Madina 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 assembly accepted by the GNU binutils 'gas'
// assembler. The Intel 'ias' and HP-UX 'as' assemblers *may* choke on this
// output, but if so that's a bug I'd like to hear about: please file a bug
// report in bugzilla. FYI, the not too bad 'ias' assembler is bundled with
// the Intel C/C++ compiler for Itanium Linux.
//
//===----------------------------------------------------------------------===//
#include "IA64.h"
#include "IA64TargetMachine.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Target/TargetAsmInfo.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 IA64AsmPrinter : public AsmPrinter {
std::set<std::string> ExternalFunctionNames, ExternalObjectNames;
IA64AsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
: AsmPrinter(O, TM, T) {
}
virtual const char *getPassName() const {
return "IA64 Assembly Printer";
}
/// printInstruction - This method is automatically generated by tablegen
/// from the instruction set description. This method returns true if the
/// machine instruction was sufficiently described to print it, otherwise it
/// returns false.
bool printInstruction(const MachineInstr *MI);
// This method is used by the tablegen'erated instruction printer.
void printOperand(const MachineInstr *MI, unsigned OpNo){
const MachineOperand &MO = MI->getOperand(OpNo);
if (MO.getType() == MachineOperand::MO_Register) {
assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physref??");
//XXX Bug Workaround: See note in Printer::doInitialization about %.
O << TM.getRegisterInfo()->get(MO.getReg()).Name;
} else {
printOp(MO);
}
}
void printS8ImmOperand(const MachineInstr *MI, unsigned OpNo) {
int val=(unsigned int)MI->getOperand(OpNo).getImmedValue();
if(val>=128) val=val-256; // if negative, flip sign
O << val;
}
void printS14ImmOperand(const MachineInstr *MI, unsigned OpNo) {
int val=(unsigned int)MI->getOperand(OpNo).getImmedValue();
if(val>=8192) val=val-16384; // if negative, flip sign
O << val;
}
void printS22ImmOperand(const MachineInstr *MI, unsigned OpNo) {
int val=(unsigned int)MI->getOperand(OpNo).getImmedValue();
if(val>=2097152) val=val-4194304; // if negative, flip sign
O << val;
}
void printU64ImmOperand(const MachineInstr *MI, unsigned OpNo) {
O << (uint64_t)MI->getOperand(OpNo).getImmedValue();
}
void printS64ImmOperand(const MachineInstr *MI, unsigned OpNo) {
// XXX : nasty hack to avoid GPREL22 "relocation truncated to fit" linker
// errors - instead of add rX = @gprel(CPI<whatever>), r1;; we now
// emit movl rX = @gprel(CPI<whatever);;
// add rX = rX, r1;
// this gives us 64 bits instead of 22 (for the add long imm) to play
// with, which shuts up the linker. The problem is that the constant
// pool entries aren't immediates at this stage, so we check here.
// If it's an immediate, print it the old fashioned way. If it's
// not, we print it as a constant pool index.
if(MI->getOperand(OpNo).isImmediate()) {
O << (int64_t)MI->getOperand(OpNo).getImmedValue();
} else { // this is a constant pool reference: FIXME: assert this
printOp(MI->getOperand(OpNo));
}
}
void printGlobalOperand(const MachineInstr *MI, unsigned OpNo) {
printOp(MI->getOperand(OpNo), false); // this is NOT a br.call instruction
}
void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
printOp(MI->getOperand(OpNo), true); // this is a br.call instruction
}
std::string getSectionForFunction(const Function &F) const;
void printMachineInstruction(const MachineInstr *MI);
void printOp(const MachineOperand &MO, bool isBRCALLinsn= false);
bool runOnMachineFunction(MachineFunction &F);
bool doInitialization(Module &M);
bool doFinalization(Module &M);
};
} // end of anonymous namespace
// Include the auto-generated portion of the assembly writer.
#include "IA64GenAsmWriter.inc"
std::string IA64AsmPrinter::getSectionForFunction(const Function &F) const {
// This means "Allocated instruXions in mem, initialized".
return "\n\t.section .text, \"ax\", \"progbits\"\n";
}
/// runOnMachineFunction - This uses the printMachineInstruction()
/// method to print assembly for each instruction.
///
bool IA64AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
SetupMachineFunction(MF);
O << "\n\n";
// Print out constants referenced by the function
EmitConstantPool(MF.getConstantPool());
const Function *F = MF.getFunction();
SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
// Print out labels for the function.
EmitAlignment(5);
O << "\t.global\t" << CurrentFnName << "\n";
O << "\t.type\t" << CurrentFnName << ", @function\n";
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 there are any predecessors.
if (I->pred_begin() != I->pred_end()) {
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);
}
}
// We didn't modify anything.
return false;
}
void IA64AsmPrinter::printOp(const MachineOperand &MO,
bool isBRCALLinsn /* = false */) {
const MRegisterInfo &RI = *TM.getRegisterInfo();
switch (MO.getType()) {
case MachineOperand::MO_Register:
O << RI.get(MO.getReg()).Name;
return;
case MachineOperand::MO_Immediate:
O << MO.getImmedValue();
return;
case MachineOperand::MO_MachineBasicBlock:
printBasicBlockLabel(MO.getMachineBasicBlock());
return;
case MachineOperand::MO_ConstantPoolIndex: {
O << "@gprel(" << TAI->getPrivateGlobalPrefix()
<< "CPI" << getFunctionNumber() << "_"
<< MO.getConstantPoolIndex() << ")";
return;
}
case MachineOperand::MO_GlobalAddress: {
// functions need @ltoff(@fptr(fn_name)) form
GlobalValue *GV = MO.getGlobal();
Function *F = dyn_cast<Function>(GV);
bool Needfptr=false; // if we're computing an address @ltoff(X), do
// we need to decorate it so it becomes
// @ltoff(@fptr(X)) ?
if (F && !isBRCALLinsn /*&& F->isExternal()*/)
Needfptr=true;
// if this is the target of a call instruction, we should define
// the function somewhere (GNU gas has no problem without this, but
// Intel ias rightly complains of an 'undefined symbol')
if (F /*&& isBRCALLinsn*/ && F->isExternal())
ExternalFunctionNames.insert(Mang->getValueName(MO.getGlobal()));
else
if (GV->isExternal()) // e.g. stuff like 'stdin'
ExternalObjectNames.insert(Mang->getValueName(MO.getGlobal()));
if (!isBRCALLinsn)
O << "@ltoff(";
if (Needfptr)
O << "@fptr(";
O << Mang->getValueName(MO.getGlobal());
if (Needfptr && !isBRCALLinsn)
O << "#))"; // close both fptr( and ltoff(
else {
if (Needfptr)
O << "#)"; // close only fptr(
if (!isBRCALLinsn)
O << "#)"; // close only ltoff(
}
int Offset = MO.getOffset();
if (Offset > 0)
O << " + " << Offset;
else if (Offset < 0)
O << " - " << -Offset;
return;
}
case MachineOperand::MO_ExternalSymbol:
O << MO.getSymbolName();
ExternalFunctionNames.insert(MO.getSymbolName());
return;
default:
O << "<AsmPrinter: unknown operand type: " << MO.getType() << " >"; return;
}
}
/// printMachineInstruction -- Print out a single IA64 LLVM instruction
/// MI to the current output stream.
///
void IA64AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
++EmittedInsts;
// Call the autogenerated instruction printer routines.
printInstruction(MI);
}
bool IA64AsmPrinter::doInitialization(Module &M) {
AsmPrinter::doInitialization(M);
O << "\n.ident \"LLVM-ia64\"\n\n"
<< "\t.psr lsb\n" // should be "msb" on HP-UX, for starters
<< "\t.radix C\n"
<< "\t.psr abi64\n"; // we only support 64 bits for now
return false;
}
bool IA64AsmPrinter::doFinalization(Module &M) {
const TargetData *TD = TM.getTargetData();
// Print out module-level global variables here.
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());
if (C->isNullValue() &&
(I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
I->hasWeakLinkage() /* FIXME: Verify correct */)) {
SwitchToDataSection(".data", I);
if (I->hasInternalLinkage()) {
O << "\t.lcomm " << name << "#," << TD->getTypeSize(C->getType())
<< "," << (1 << Align);
O << "\t\t// ";
} else {
O << "\t.common " << name << "#," << TD->getTypeSize(C->getType())
<< "," << (1 << Align);
O << "\t\t// ";
}
WriteAsOperand(O, I, true, true, &M);
O << "\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.global " << name << "\n";
// FALL THROUGH
case GlobalValue::InternalLinkage:
SwitchToDataSection(C->isNullValue() ? ".bss" : ".data", I);
break;
case GlobalValue::GhostLinkage:
std::cerr << "GhostLinkage cannot appear in IA64AsmPrinter!\n";
abort();
case GlobalValue::DLLImportLinkage:
std::cerr << "DLLImport linkage is not supported by this target!\n";
abort();
case GlobalValue::DLLExportLinkage:
std::cerr << "DLLExport linkage is not supported by this target!\n";
abort();
default:
assert(0 && "Unknown linkage type!");
}
EmitAlignment(Align);
O << "\t.type " << name << ",@object\n";
O << "\t.size " << name << "," << Size << "\n";
O << name << ":\t\t\t\t// ";
WriteAsOperand(O, I, true, true, &M);
O << " = ";
WriteAsOperand(O, C, false, false, &M);
O << "\n";
EmitGlobalConstant(C);
}
}
// we print out ".global X \n .type X, @function" for each external function
O << "\n\n// br.call targets referenced (and not defined) above: \n";
for (std::set<std::string>::iterator i = ExternalFunctionNames.begin(),
e = ExternalFunctionNames.end(); i!=e; ++i) {
O << "\t.global " << *i << "\n\t.type " << *i << ", @function\n";
}
O << "\n\n";
// we print out ".global X \n .type X, @object" for each external object
O << "\n\n// (external) symbols referenced (and not defined) above: \n";
for (std::set<std::string>::iterator i = ExternalObjectNames.begin(),
e = ExternalObjectNames.end(); i!=e; ++i) {
O << "\t.global " << *i << "\n\t.type " << *i << ", @object\n";
}
O << "\n\n";
AsmPrinter::doFinalization(M);
return false; // success
}
/// createIA64CodePrinterPass - Returns a pass that prints the IA64
/// assembly code for a MachineFunction to the given output stream, using
/// the given target machine description.
///
FunctionPass *llvm::createIA64CodePrinterPass(std::ostream &o,
IA64TargetMachine &tm) {
return new IA64AsmPrinter(o, tm, tm.getTargetAsmInfo());
}
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