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llvm-mirror/lib/Target/IA64/IA64AsmPrinter.cpp
Misha Brukman 66d3c6e020 Convert tabs to spaces 
llvm-svn: 21452
2005-04-22 17:54:37 +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 excellent '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/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Mangler.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
namespace {
Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
struct IA64SharedAsmPrinter : public AsmPrinter {
std::set<std::string> ExternalFunctionNames, ExternalObjectNames;
IA64SharedAsmPrinter(std::ostream &O, TargetMachine &TM)
: AsmPrinter(O, TM) { }
void printConstantPool(MachineConstantPool *MCP);
bool doFinalization(Module &M);
};
}
static bool isScale(const MachineOperand &MO) {
return MO.isImmediate() &&
(MO.getImmedValue() == 1 || MO.getImmedValue() == 2 ||
MO.getImmedValue() == 4 || MO.getImmedValue() == 8);
}
static bool isMem(const MachineInstr *MI, unsigned Op) {
if (MI->getOperand(Op).isFrameIndex()) return true;
if (MI->getOperand(Op).isConstantPoolIndex()) return true;
return Op+4 <= MI->getNumOperands() &&
MI->getOperand(Op ).isRegister() && isScale(MI->getOperand(Op+1)) &&
MI->getOperand(Op+2).isRegister() && (MI->getOperand(Op+3).isImmediate() ||
MI->getOperand(Op+3).isGlobalAddress());
}
// SwitchSection - Switch to the specified section of the executable if we are
// not already in it!
//
static void SwitchSection(std::ostream &OS, std::string &CurSection,
const char *NewSection) {
if (CurSection != NewSection) {
CurSection = NewSection;
if (!CurSection.empty())
OS << "\t" << NewSection << "\n";
}
}
/// printConstantPool - Print to the current output stream assembly
/// representations of the constants in the constant pool MCP. This is
/// used to print out constants which have been "spilled to memory" by
/// the code generator.
///
void IA64SharedAsmPrinter::printConstantPool(MachineConstantPool *MCP) {
const std::vector<Constant*> &CP = MCP->getConstants();
const TargetData &TD = TM.getTargetData();
if (CP.empty()) return;
O << "\n\t.section .data, \"aw\", \"progbits\"\n";
// FIXME: would be nice to have rodata (no 'w') when appropriate?
for (unsigned i = 0, e = CP.size(); i != e; ++i) {
emitAlignment(TD.getTypeAlignmentShift(CP[i]->getType()));
O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t" << CommentString
<< *CP[i] << "\n";
emitGlobalConstant(CP[i]);
}
}
bool IA64SharedAsmPrinter::doFinalization(Module &M) {
const TargetData &TD = TM.getTargetData();
std::string CurSection;
// 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
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 */)) {
SwitchSection(O, CurSection, ".data");
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";
SwitchSection(O, CurSection, "");
O << "\t.section\t.llvm.linkonce.d." << name
<< ", \"aw\", \"progbits\"\n";
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:
if (C->isNullValue())
SwitchSection(O, CurSection, ".bss");
else
SwitchSection(O, CurSection, ".data");
break;
case GlobalValue::GhostLinkage:
std::cerr << "GhostLinkage cannot appear in IA64AsmPrinter!\n";
abort();
}
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
}
namespace {
struct IA64AsmPrinter : public IA64SharedAsmPrinter {
IA64AsmPrinter(std::ostream &O, TargetMachine &TM)
: IA64SharedAsmPrinter(O, TM) {
CommentString = "//";
Data8bitsDirective = "\tdata1\t"; // FIXME: check that we are
Data16bitsDirective = "\tdata2.ua\t"; // disabling auto-alignment
Data32bitsDirective = "\tdata4.ua\t"; // properly
Data64bitsDirective = "\tdata8.ua\t";
ZeroDirective = "\t.skip\t";
AsciiDirective = "\tstring\t";
GlobalVarAddrPrefix="";
GlobalVarAddrSuffix="";
FunctionAddrPrefix="@fptr(";
FunctionAddrSuffix=")";
}
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, MVT::ValueType VT){
const MachineOperand &MO = MI->getOperand(OpNo);
if (MO.getType() == MachineOperand::MO_MachineRegister) {
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,
MVT::ValueType VT) {
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,
MVT::ValueType VT) {
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,
MVT::ValueType VT) {
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,
MVT::ValueType VT) {
O << (uint64_t)MI->getOperand(OpNo).getImmedValue();
}
void printS64ImmOperand(const MachineInstr *MI, unsigned OpNo,
MVT::ValueType VT) {
O << (int64_t)MI->getOperand(OpNo).getImmedValue();
}
void printCallOperand(const MachineInstr *MI, unsigned OpNo,
MVT::ValueType VT) {
printOp(MI->getOperand(OpNo), true); // this is a br.call instruction
}
void printMachineInstruction(const MachineInstr *MI);
void printOp(const MachineOperand &MO, bool isBRCALLinsn= false);
bool runOnMachineFunction(MachineFunction &F);
bool doInitialization(Module &M);
};
} // end of anonymous namespace
// Include the auto-generated portion of the assembly writer.
#include "IA64GenAsmWriter.inc"
/// 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
printConstantPool(MF.getConstantPool());
// Print out labels for the function.
O << "\n\t.section .text, \"ax\", \"progbits\"\n";
// ^^ means "Allocated instruXions in mem, initialized"
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())
O << ".LBB" << CurrentFnName << "_" << I->getNumber() << ":\t"
<< CommentString << " " << I->getBasicBlock()->getName() << "\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_VirtualRegister:
if (Value *V = MO.getVRegValueOrNull()) {
O << "<" << V->getName() << ">";
return;
}
// FALLTHROUGH
case MachineOperand::MO_MachineRegister:
case MachineOperand::MO_CCRegister: {
O << RI.get(MO.getReg()).Name;
return;
}
case MachineOperand::MO_SignExtendedImmed:
case MachineOperand::MO_UnextendedImmed:
O << /*(unsigned int)*/MO.getImmedValue();
return;
case MachineOperand::MO_MachineBasicBlock: {
MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction())
<< "_" << MBBOp->getNumber () << "\t// "
<< MBBOp->getBasicBlock ()->getName ();
return;
}
case MachineOperand::MO_PCRelativeDisp:
std::cerr << "Shouldn't use addPCDisp() when building IA64 MachineInstrs";
abort ();
return;
case MachineOperand::MO_ConstantPoolIndex: {
O << "@gprel(.CPI" << CurrentFnName << "_"
<< 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)
O << ")"; // close fptr(
if (!isBRCALLinsn)
O << ")"; // close 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;
}
/// 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,TargetMachine &tm){
return new IA64AsmPrinter(o, tm);
}
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