lib/Target/Sparc/SparcAsmPrinter.cpp - platform/external/llvm - Git at Google

 //===-- SparcAsmPrinter.cpp - Sparc 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 SPARC assembly language.
 //
 //===----------------------------------------------------------------------===//

 #define DEBUG_TYPE "asm-printer"
 #include "Sparc.h"
 #include "SparcInstrInfo.h"
 #include "llvm/Constants.h"
 #include "llvm/DerivedTypes.h"
 #include "llvm/Module.h"
 #include "llvm/CodeGen/AsmPrinter.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/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>
 using namespace llvm;

 STATISTIC(EmittedInsts, "Number of machine instrs printed");

 namespace {
   struct VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
     SparcAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
       : AsmPrinter(O, TM, T) {
     }

     /// 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 "Sparc Assembly Printer";
     }

     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 "SparcGenAsmWriter.inc"

 /// createSparcCodePrinterPass - Returns a pass that prints the SPARC
 /// 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::createSparcCodePrinterPass(std::ostream &o,
                                                TargetMachine &tm) {
   return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo());
 }

 /// runOnMachineFunction - This uses the printMachineInstruction()
 /// method to print assembly for each instruction.
 ///
 bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   SetupMachineFunction(MF);

   // Print out constants referenced by the function
   EmitConstantPool(MF.getConstantPool());

   // BBNumber is used here so that a given Printer will never give two
   // BBs the same name. (If you have a better way, please let me know!)
   static unsigned BBNumber = 0;

   O << "\n\n";
   // What's my mangled name?
   CurrentFnName = Mang->getValueName(MF.getFunction());

   // Print out the label for the function.
   const Function *F = MF.getFunction();
   SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
   EmitAlignment(4, F);
   O << "\t.globl\t" << CurrentFnName << "\n";
   O << "\t.type\t" << CurrentFnName << ", #function\n";
   O << CurrentFnName << ":\n";

   // Number each basic block so that we can consistently refer to them
   // in PC-relative references.
   // FIXME: Why not use the MBB numbers?
   NumberForBB.clear();
   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
        I != E; ++I) {
     NumberForBB[I->getBasicBlock()] = BBNumber++;
   }

   // 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);
       ++EmittedInsts;
     }
   }

   // We didn't modify anything.
   return false;
 }

 void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
   const MachineOperand &MO = MI->getOperand (opNum);
   const MRegisterInfo &RI = *TM.getRegisterInfo();
   bool CloseParen = false;
   if (MI->getOpcode() == SP::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
     O << "%hi(";
     CloseParen = true;
   } else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri)
              && !MO.isRegister() && !MO.isImmediate()) {
     O << "%lo(";
     CloseParen = true;
   }
   switch (MO.getType()) {
   case MachineOperand::MO_Register:
     if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
       O << "%" << LowercaseString (RI.get(MO.getReg()).Name);
     else
       O << "%reg" << MO.getReg();
     break;

   case MachineOperand::MO_Immediate:
     O << (int)MO.getImmedValue();
     break;
   case MachineOperand::MO_MachineBasicBlock:
     printBasicBlockLabel(MO.getMachineBasicBlock());
     return;
   case MachineOperand::MO_GlobalAddress:
     O << Mang->getValueName(MO.getGlobal());
     break;
   case MachineOperand::MO_ExternalSymbol:
     O << MO.getSymbolName();
     break;
   case MachineOperand::MO_ConstantPoolIndex:
     O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
       << MO.getConstantPoolIndex();
     break;
   default:
     O << "<unknown operand type>"; abort (); break;
   }
   if (CloseParen) O << ")";
 }

 void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
                                       const char *Modifier) {
   printOperand(MI, opNum);

   // If this is an ADD operand, emit it like normal operands.
   if (Modifier && !strcmp(Modifier, "arith")) {
     O << ", ";
     printOperand(MI, opNum+1);
     return;
   }

   if (MI->getOperand(opNum+1).isRegister() &&
       MI->getOperand(opNum+1).getReg() == SP::G0)
     return;   // don't print "+%g0"
   if (MI->getOperand(opNum+1).isImmediate() &&
       MI->getOperand(opNum+1).getImmedValue() == 0)
     return;   // don't print "+0"

   O << "+";
   if (MI->getOperand(opNum+1).isGlobalAddress() ||
       MI->getOperand(opNum+1).isConstantPoolIndex()) {
     O << "%lo(";
     printOperand(MI, opNum+1);
     O << ")";
   } else {
     printOperand(MI, opNum+1);
   }
 }

 void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
   int CC = (int)MI->getOperand(opNum).getImmedValue();
   O << SPARCCondCodeToString((SPCC::CondCodes)CC);
 }


 bool SparcAsmPrinter::doInitialization(Module &M) {
   Mang = new Mangler(M);
   return false; // success
 }

 bool SparcAsmPrinter::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->getABITypeSize(C->getType());
       unsigned Align = TD->getPrefTypeAlignment(C->getType());

       if (C->isNullValue() &&
           (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
            I->hasWeakLinkage() /* FIXME: Verify correct */)) {
         SwitchToDataSection(".data", I);
         if (I->hasInternalLinkage())
           O << "\t.local " << name << "\n";

         O << "\t.comm " << name << "," << TD->getABITypeSize(C->getType())
           << "," << Align;
         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";
           SwitchToDataSection("", I);
           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.globl " << name << "\n";
           // FALL THROUGH
         case GlobalValue::InternalLinkage:
           if (C->isNullValue())
             SwitchToDataSection(".bss", I);
           else
             SwitchToDataSection(".data", I);
           break;
         case GlobalValue::GhostLinkage:
           cerr << "Should not have any unmaterialized functions!\n";
           abort();
         case GlobalValue::DLLImportLinkage:
           cerr << "DLLImport linkage is not supported by this target!\n";
           abort();
         case GlobalValue::DLLExportLinkage:
           cerr << "DLLExport linkage is not supported by this target!\n";
           abort();
         default:
           assert(0 && "Unknown linkage type!");
         }

         O << "\t.align " << Align << "\n";
         O << "\t.type " << name << ",#object\n";
         O << "\t.size " << name << "," << Size << "\n";
         O << name << ":\n";
         EmitGlobalConstant(C);
       }
     }

   return AsmPrinter::doFinalization(M);
 }
	//===-- SparcAsmPrinter.cpp - Sparc 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 SPARC assembly language.
	//
	//===----------------------------------------------------------------------===//

	#define DEBUG_TYPE "asm-printer"
	#include "Sparc.h"
	#include "SparcInstrInfo.h"
	#include "llvm/Constants.h"
	#include "llvm/DerivedTypes.h"
	#include "llvm/Module.h"
	#include "llvm/CodeGen/AsmPrinter.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/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>
	using namespace llvm;

	STATISTIC(EmittedInsts, "Number of machine instrs printed");

	namespace {
	struct VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
	SparcAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
	: AsmPrinter(O, TM, T) {
	}

	/// 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 "Sparc Assembly Printer";
	}

	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 "SparcGenAsmWriter.inc"

	/// createSparcCodePrinterPass - Returns a pass that prints the SPARC
	/// 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::createSparcCodePrinterPass(std::ostream &o,
	TargetMachine &tm) {
	return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo());
	}

	/// runOnMachineFunction - This uses the printMachineInstruction()
	/// method to print assembly for each instruction.
	///
	bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
	SetupMachineFunction(MF);

	// Print out constants referenced by the function
	EmitConstantPool(MF.getConstantPool());

	// BBNumber is used here so that a given Printer will never give two
	// BBs the same name. (If you have a better way, please let me know!)
	static unsigned BBNumber = 0;

	O << "\n\n";
	// What's my mangled name?
	CurrentFnName = Mang->getValueName(MF.getFunction());

	// Print out the label for the function.
	const Function *F = MF.getFunction();
	SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
	EmitAlignment(4, F);
	O << "\t.globl\t" << CurrentFnName << "\n";
	O << "\t.type\t" << CurrentFnName << ", #function\n";
	O << CurrentFnName << ":\n";

	// Number each basic block so that we can consistently refer to them
	// in PC-relative references.
	// FIXME: Why not use the MBB numbers?
	NumberForBB.clear();
	for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
	I != E; ++I) {
	NumberForBB[I->getBasicBlock()] = BBNumber++;
	}

	// 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);
	++EmittedInsts;
	}
	}

	// We didn't modify anything.
	return false;
	}

	void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
	const MachineOperand &MO = MI->getOperand (opNum);
	const MRegisterInfo &RI = *TM.getRegisterInfo();
	bool CloseParen = false;
	if (MI->getOpcode() == SP::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
	O << "%hi(";
	CloseParen = true;
	} else if ((MI->getOpcode() == SP::ORri \|\| MI->getOpcode() == SP::ADDri)
	&& !MO.isRegister() && !MO.isImmediate()) {
	O << "%lo(";
	CloseParen = true;
	}
	switch (MO.getType()) {
	case MachineOperand::MO_Register:
	if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
	O << "%" << LowercaseString (RI.get(MO.getReg()).Name);
	else
	O << "%reg" << MO.getReg();
	break;

	case MachineOperand::MO_Immediate:
	O << (int)MO.getImmedValue();
	break;
	case MachineOperand::MO_MachineBasicBlock:
	printBasicBlockLabel(MO.getMachineBasicBlock());
	return;
	case MachineOperand::MO_GlobalAddress:
	O << Mang->getValueName(MO.getGlobal());
	break;
	case MachineOperand::MO_ExternalSymbol:
	O << MO.getSymbolName();
	break;
	case MachineOperand::MO_ConstantPoolIndex:
	O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
	<< MO.getConstantPoolIndex();
	break;
	default:
	O << "<unknown operand type>"; abort (); break;
	}
	if (CloseParen) O << ")";
	}

	void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
	const char *Modifier) {
	printOperand(MI, opNum);

	// If this is an ADD operand, emit it like normal operands.
	if (Modifier && !strcmp(Modifier, "arith")) {
	O << ", ";
	printOperand(MI, opNum+1);
	return;
	}

	if (MI->getOperand(opNum+1).isRegister() &&
	MI->getOperand(opNum+1).getReg() == SP::G0)
	return; // don't print "+%g0"
	if (MI->getOperand(opNum+1).isImmediate() &&
	MI->getOperand(opNum+1).getImmedValue() == 0)
	return; // don't print "+0"

	O << "+";
	if (MI->getOperand(opNum+1).isGlobalAddress() \|\|
	MI->getOperand(opNum+1).isConstantPoolIndex()) {
	O << "%lo(";
	printOperand(MI, opNum+1);
	O << ")";
	} else {
	printOperand(MI, opNum+1);
	}
	}

	void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
	int CC = (int)MI->getOperand(opNum).getImmedValue();
	O << SPARCCondCodeToString((SPCC::CondCodes)CC);
	}



	bool SparcAsmPrinter::doInitialization(Module &M) {
	Mang = new Mangler(M);
	return false; // success
	}

	bool SparcAsmPrinter::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->getABITypeSize(C->getType());
	unsigned Align = TD->getPrefTypeAlignment(C->getType());

	if (C->isNullValue() &&
	(I->hasLinkOnceLinkage() \|\| I->hasInternalLinkage() \|\|
	I->hasWeakLinkage() /* FIXME: Verify correct */)) {
	SwitchToDataSection(".data", I);
	if (I->hasInternalLinkage())
	O << "\t.local " << name << "\n";

	O << "\t.comm " << name << "," << TD->getABITypeSize(C->getType())
	<< "," << Align;
	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";
	SwitchToDataSection("", I);
	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.globl " << name << "\n";
	// FALL THROUGH
	case GlobalValue::InternalLinkage:
	if (C->isNullValue())
	SwitchToDataSection(".bss", I);
	else
	SwitchToDataSection(".data", I);
	break;
	case GlobalValue::GhostLinkage:
	cerr << "Should not have any unmaterialized functions!\n";
	abort();
	case GlobalValue::DLLImportLinkage:
	cerr << "DLLImport linkage is not supported by this target!\n";
	abort();
	case GlobalValue::DLLExportLinkage:
	cerr << "DLLExport linkage is not supported by this target!\n";
	abort();
	default:
	assert(0 && "Unknown linkage type!");
	}

	O << "\t.align " << Align << "\n";
	O << "\t.type " << name << ",#object\n";
	O << "\t.size " << name << "," << Size << "\n";
	O << name << ":\n";
	EmitGlobalConstant(C);
	}
	}

	return AsmPrinter::doFinalization(M);
	}