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llvm-6502/lib/Target/SparcV9/SparcV9AsmPrinter.cpp
Reid Spencer 551ccae044 Changes For Bug 352 
Move include/Config and include/Support into include/llvm/Config,
include/llvm/ADT and include/llvm/Support. From here on out, all LLVM
public header files must be under include/llvm/.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16137 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-01 22:55:40 +00:00

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//===-- EmitAssembly.cpp - Emit SparcV9 Specific .s File -------------------==//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements all of the stuff necessary to output a .s file from
// LLVM. The code in this file assumes that the specified module has already
// been compiled into the internal data structures of the Module.
//
// This code largely consists of two LLVM Pass's: a FunctionPass and a Pass.
// The FunctionPass is pipelined together with all of the rest of the code
// generation stages, and the Pass runs at the end to emit code for global
// variables and such.
//
//===----------------------------------------------------------------------===//
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Support/Mangler.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Statistic.h"
#include "SparcV9Internals.h"
#include "MachineFunctionInfo.h"
#include <string>
using namespace llvm;
namespace {
Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
}
namespace {
struct SparcV9AsmPrinter : public AsmPrinter {
public:
enum Sections {
Unknown,
Text,
ReadOnlyData,
InitRWData,
ZeroInitRWData,
} CurSection;
SparcV9AsmPrinter(std::ostream &OS, TargetMachine &TM)
: AsmPrinter(OS, TM), CurSection(Unknown) {
ZeroDirective = 0; // No way to get zeros.
Data16bitsDirective = "\t.half\t";
Data32bitsDirective = "\t.word\t";
Data64bitsDirective = "\t.xword\t";
CommentString = "!";
}
const char *getPassName() const {
return "SparcV9 Assembly Printer";
}
// Print a constant (which may be an aggregate) prefixed by all the
// appropriate directives. Uses printConstantValueOnly() to print the
// value or values.
void printConstant(const Constant* CV, const std::string &valID) {
emitAlignment(TM.getTargetData().getTypeAlignmentShift(CV->getType()));
O << "\t.type" << "\t" << valID << ",#object\n";
unsigned constSize = TM.getTargetData().getTypeSize(CV->getType());
O << "\t.size" << "\t" << valID << "," << constSize << "\n";
O << valID << ":\n";
emitGlobalConstant(CV);
}
// enterSection - Use this method to enter a different section of the output
// executable. This is used to only output necessary section transitions.
//
void enterSection(enum Sections S) {
if (S == CurSection) return; // Only switch section if necessary
CurSection = S;
O << "\n\t.section ";
switch (S)
{
default: assert(0 && "Bad section name!");
case Text: O << "\".text\""; break;
case ReadOnlyData: O << "\".rodata\",#alloc"; break;
case InitRWData: O << "\".data\",#alloc,#write"; break;
case ZeroInitRWData: O << "\".bss\",#alloc,#write"; break;
}
O << "\n";
}
// getID Wrappers - Ensure consistent usage
// Symbol names in SparcV9 assembly language have these rules:
// (a) Must match { letter | _ | . | $ } { letter | _ | . | $ | digit }*
// (b) A name beginning in "." is treated as a local name.
std::string getID(const Function *F) {
return Mang->getValueName(F);
}
std::string getID(const BasicBlock *BB) {
return ".L_" + getID(BB->getParent()) + "_" + Mang->getValueName(BB);
}
std::string getID(const GlobalVariable *GV) {
return Mang->getValueName(GV);
}
std::string getID(const Constant *CV) {
return ".C_" + Mang->getValueName(CV);
}
std::string getID(const GlobalValue *GV) {
if (const GlobalVariable *V = dyn_cast<GlobalVariable>(GV))
return getID(V);
else if (const Function *F = dyn_cast<Function>(GV))
return getID(F);
assert(0 && "Unexpected type of GlobalValue!");
return "";
}
virtual bool runOnMachineFunction(MachineFunction &MF) {
setupMachineFunction(MF);
emitFunction(MF);
return false;
}
virtual bool doFinalization(Module &M) {
emitGlobals(M);
AsmPrinter::doFinalization(M);
return false;
}
void emitFunction(MachineFunction &F);
private :
void emitBasicBlock(const MachineBasicBlock &MBB);
void emitMachineInst(const MachineInstr *MI);
unsigned int printOperands(const MachineInstr *MI, unsigned int opNum);
void printOneOperand(const MachineOperand &Op, MachineOpCode opCode);
bool OpIsBranchTargetLabel(const MachineInstr *MI, unsigned int opNum);
bool OpIsMemoryAddressBase(const MachineInstr *MI, unsigned int opNum);
unsigned getOperandMask(unsigned Opcode) {
switch (Opcode) {
case V9::SUBccr:
case V9::SUBcci: return 1 << 3; // Remove CC argument
default: return 0; // By default, don't hack operands...
}
}
void emitGlobals(const Module &M);
void printGlobalVariable(const GlobalVariable *GV);
};
} // End anonymous namespace
inline bool
SparcV9AsmPrinter::OpIsBranchTargetLabel(const MachineInstr *MI,
unsigned int opNum) {
switch (MI->getOpcode()) {
case V9::JMPLCALLr:
case V9::JMPLCALLi:
case V9::JMPLRETr:
case V9::JMPLRETi:
return (opNum == 0);
default:
return false;
}
}
inline bool
SparcV9AsmPrinter::OpIsMemoryAddressBase(const MachineInstr *MI,
unsigned int opNum) {
if (TM.getInstrInfo()->isLoad(MI->getOpcode()))
return (opNum == 0);
else if (TM.getInstrInfo()->isStore(MI->getOpcode()))
return (opNum == 1);
else
return false;
}
unsigned int
SparcV9AsmPrinter::printOperands(const MachineInstr *MI, unsigned opNum) {
const MachineOperand& mop = MI->getOperand(opNum);
if (OpIsBranchTargetLabel(MI, opNum)) {
printOneOperand(mop, MI->getOpcode());
O << "+";
printOneOperand(MI->getOperand(opNum+1), MI->getOpcode());
return 2;
} else if (OpIsMemoryAddressBase(MI, opNum)) {
O << "[";
printOneOperand(mop, MI->getOpcode());
O << "+";
printOneOperand(MI->getOperand(opNum+1), MI->getOpcode());
O << "]";
return 2;
} else {
printOneOperand(mop, MI->getOpcode());
return 1;
}
}
void
SparcV9AsmPrinter::printOneOperand(const MachineOperand &mop,
MachineOpCode opCode)
{
bool needBitsFlag = true;
if (mop.isHiBits32())
O << "%lm(";
else if (mop.isLoBits32())
O << "%lo(";
else if (mop.isHiBits64())
O << "%hh(";
else if (mop.isLoBits64())
O << "%hm(";
else
needBitsFlag = false;
switch (mop.getType())
{
case MachineOperand::MO_VirtualRegister:
case MachineOperand::MO_CCRegister:
case MachineOperand::MO_MachineRegister:
{
int regNum = (int)mop.getReg();
if (regNum == TM.getRegInfo()->getInvalidRegNum()) {
// better to print code with NULL registers than to die
O << "<NULL VALUE>";
} else {
O << "%" << TM.getRegInfo()->getUnifiedRegName(regNum);
}
break;
}
case MachineOperand::MO_ConstantPoolIndex:
{
O << ".CPI_" << CurrentFnName << "_" << mop.getConstantPoolIndex();
break;
}
case MachineOperand::MO_PCRelativeDisp:
{
const Value *Val = mop.getVRegValue();
assert(Val && "\tNULL Value in SparcV9AsmPrinter");
if (const BasicBlock *BB = dyn_cast<BasicBlock>(Val))
O << getID(BB);
else if (const Function *F = dyn_cast<Function>(Val))
O << getID(F);
else if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(Val))
O << getID(GV);
else if (const Constant *CV = dyn_cast<Constant>(Val))
O << getID(CV);
else
assert(0 && "Unrecognized value in SparcV9AsmPrinter");
break;
}
case MachineOperand::MO_SignExtendedImmed:
O << mop.getImmedValue();
break;
case MachineOperand::MO_UnextendedImmed:
O << (uint64_t) mop.getImmedValue();
break;
default:
O << mop; // use dump field
break;
}
if (needBitsFlag)
O << ")";
}
void SparcV9AsmPrinter::emitMachineInst(const MachineInstr *MI) {
unsigned Opcode = MI->getOpcode();
if (Opcode == V9::PHI)
return; // Ignore Machine-PHI nodes.
O << "\t" << TM.getInstrInfo()->getName(Opcode) << "\t";
unsigned Mask = getOperandMask(Opcode);
bool NeedComma = false;
unsigned N = 1;
for (unsigned OpNum = 0; OpNum < MI->getNumOperands(); OpNum += N)
if (! ((1 << OpNum) & Mask)) { // Ignore this operand?
if (NeedComma) O << ", "; // Handle comma outputting
NeedComma = true;
N = printOperands(MI, OpNum);
} else
N = 1;
O << "\n";
++EmittedInsts;
}
void SparcV9AsmPrinter::emitBasicBlock(const MachineBasicBlock &MBB) {
// Emit a label for the basic block
O << getID(MBB.getBasicBlock()) << ":\n";
// Loop over all of the instructions in the basic block...
for (MachineBasicBlock::const_iterator MII = MBB.begin(), MIE = MBB.end();
MII != MIE; ++MII)
emitMachineInst(MII);
O << "\n"; // Separate BB's with newlines
}
void SparcV9AsmPrinter::emitFunction(MachineFunction &MF) {
O << "!****** Outputing Function: " << CurrentFnName << " ******\n";
// Emit constant pool for this function
const MachineConstantPool *MCP = MF.getConstantPool();
const std::vector<Constant*> &CP = MCP->getConstants();
enterSection(ReadOnlyData);
for (unsigned i = 0, e = CP.size(); i != e; ++i) {
std::string cpiName = ".CPI_" + CurrentFnName + "_" + utostr(i);
printConstant(CP[i], cpiName);
}
enterSection(Text);
O << "\t.align\t4\n\t.global\t" << CurrentFnName << "\n";
//O << "\t.type\t" << CurrentFnName << ",#function\n";
O << "\t.type\t" << CurrentFnName << ", 2\n";
O << CurrentFnName << ":\n";
// Output code for all of the basic blocks in the function...
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); I != E;++I)
emitBasicBlock(*I);
// Output a .size directive so the debugger knows the extents of the function
O << ".EndOf_" << CurrentFnName << ":\n\t.size "
<< CurrentFnName << ", .EndOf_"
<< CurrentFnName << "-" << CurrentFnName << "\n";
// Put some spaces between the functions
O << "\n\n";
}
void SparcV9AsmPrinter::printGlobalVariable(const GlobalVariable* GV) {
if (GV->hasExternalLinkage())
O << "\t.global\t" << getID(GV) << "\n";
if (GV->hasInitializer() && ! GV->getInitializer()->isNullValue()) {
printConstant(GV->getInitializer(), getID(GV));
} else {
const Type *ValTy = GV->getType()->getElementType();
emitAlignment(TM.getTargetData().getTypeAlignmentShift(ValTy));
O << "\t.type\t" << getID(GV) << ",#object\n";
O << "\t.reserve\t" << getID(GV) << ","
<< TM.getTargetData().getTypeSize(GV->getType()->getElementType())
<< "\n";
}
}
void SparcV9AsmPrinter::emitGlobals(const Module &M) {
// Output global variables...
for (Module::const_giterator GI = M.gbegin(), GE = M.gend(); GI != GE; ++GI)
if (! GI->isExternal()) {
assert(GI->hasInitializer());
if (GI->isConstant())
enterSection(ReadOnlyData); // read-only, initialized data
else if (GI->getInitializer()->isNullValue())
enterSection(ZeroInitRWData); // read-write zero data
else
enterSection(InitRWData); // read-write non-zero data
printGlobalVariable(GI);
}
O << "\n";
}
FunctionPass *llvm::createAsmPrinterPass(std::ostream &Out, TargetMachine &TM) {
return new SparcV9AsmPrinter(Out, TM);
}
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