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llvm-6502/lib/Target/PowerPC/PPC64AsmPrinter.cpp
Chris Lattner 08eceec98d Zimm16 is now dead. Its entry is not removed from the enum, to avoid having 
to renumber everything.  Similar elimination should be applied to other
operand enum values that are only used to format printing in the .s file.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15755 91177308-0d34-0410-b5e6-96231b3b80d8
2004-08-15 05:48:47 +00:00

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//===-- PPC64AsmPrinter.cpp - Print machine instrs to PowerPC assembly ----===//
//
// 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 contains a printer that converts from our internal representation
// of machine-dependent LLVM code to PowerPC assembly language. This printer is
// the output mechanism used by `llc'.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asmprinter"
#include "PowerPC.h"
#include "PowerPCInstrInfo.h"
#include "PPC64TargetMachine.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Mangler.h"
#include "Support/CommandLine.h"
#include "Support/Debug.h"
#include "Support/MathExtras.h"
#include "Support/Statistic.h"
#include "Support/StringExtras.h"
#include <set>
namespace llvm {
namespace {
Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
struct Printer : public MachineFunctionPass {
/// Output stream on which we're printing assembly code.
///
std::ostream &O;
/// Target machine description which we query for reg. names, data
/// layout, etc.
///
PPC64TargetMachine &TM;
/// Name-mangler for global names.
///
Mangler *Mang;
/// Map for labels corresponding to global variables
///
std::map<const GlobalVariable*,std::string> GVToLabelMap;
Printer(std::ostream &o, TargetMachine &tm) : O(o),
TM(reinterpret_cast<PPC64TargetMachine&>(tm)), LabelNumber(0) {}
/// Cache of mangled name for current function. This is
/// recalculated at the beginning of each call to
/// runOnMachineFunction().
///
std::string CurrentFnName;
/// Unique incrementer for label values for referencing Global values.
///
unsigned LabelNumber;
virtual const char *getPassName() const {
return "PPC64 Assembly Printer";
}
void printMachineInstruction(const MachineInstr *MI);
void printOp(const MachineOperand &MO, bool elideOffsetKeyword = false);
void printImmOp(const MachineOperand &MO, unsigned ArgType);
void printConstantPool(MachineConstantPool *MCP);
bool runOnMachineFunction(MachineFunction &F);
bool doInitialization(Module &M);
bool doFinalization(Module &M);
void emitGlobalConstant(const Constant* CV);
void emitConstantValueOnly(const Constant *CV);
};
} // end of anonymous namespace
/// createPPC64AsmPrinterPass - Returns a pass that prints the PPC
/// 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 or not.
///
FunctionPass *createPPC64AsmPrinter(std::ostream &o,TargetMachine &tm) {
return new Printer(o, tm);
}
/// isStringCompatible - Can we treat the specified array as a string?
/// Only if it is an array of ubytes or non-negative sbytes.
///
static bool isStringCompatible(const ConstantArray *CVA) {
const Type *ETy = cast<ArrayType>(CVA->getType())->getElementType();
if (ETy == Type::UByteTy) return true;
if (ETy != Type::SByteTy) return false;
for (unsigned i = 0; i < CVA->getNumOperands(); ++i)
if (cast<ConstantSInt>(CVA->getOperand(i))->getValue() < 0)
return false;
return true;
}
/// toOctal - Convert the low order bits of X into an octal digit.
///
static inline char toOctal(int X) {
return (X&7)+'0';
}
// Possible states while outputting ASCII strings
namespace {
enum StringSection {
None,
Alpha,
Numeric
};
}
/// SwitchStringSection - manage the changes required to output bytes as
/// characters in a string vs. numeric decimal values
///
static inline void SwitchStringSection(std::ostream &O, StringSection NewSect,
StringSection &Current) {
if (Current == None) {
if (NewSect == Alpha)
O << "\t.byte \"";
else if (NewSect == Numeric)
O << "\t.byte ";
} else if (Current == Alpha) {
if (NewSect == None)
O << "\"";
else if (NewSect == Numeric)
O << "\"\n"
<< "\t.byte ";
} else if (Current == Numeric) {
if (NewSect == Alpha)
O << '\n'
<< "\t.byte \"";
else if (NewSect == Numeric)
O << ", ";
}
Current = NewSect;
}
/// getAsCString - Return the specified array as a C compatible
/// string, only if the predicate isStringCompatible is true.
///
static void printAsCString(std::ostream &O, const ConstantArray *CVA) {
assert(isStringCompatible(CVA) && "Array is not string compatible!");
if (CVA->getNumOperands() == 0)
return;
StringSection Current = None;
for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i) {
unsigned char C = cast<ConstantInt>(CVA->getOperand(i))->getRawValue();
if (C == '"') {
SwitchStringSection(O, Alpha, Current);
O << "\"\"";
} else if (isprint(C)) {
SwitchStringSection(O, Alpha, Current);
O << C;
} else {
SwitchStringSection(O, Numeric, Current);
O << utostr((unsigned)C);
}
}
SwitchStringSection(O, None, Current);
O << '\n';
}
// Print out the specified constant, without a storage class. Only the
// constants valid in constant expressions can occur here.
void Printer::emitConstantValueOnly(const Constant *CV) {
if (CV->isNullValue())
O << "0";
else if (const ConstantBool *CB = dyn_cast<ConstantBool>(CV)) {
assert(CB == ConstantBool::True);
O << "1";
} else if (const ConstantSInt *CI = dyn_cast<ConstantSInt>(CV))
O << CI->getValue();
else if (const ConstantUInt *CI = dyn_cast<ConstantUInt>(CV))
O << CI->getValue();
else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
// This is a constant address for a global variable or function. Use the
// name of the variable or function as the address value.
O << Mang->getValueName(GV);
else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
const TargetData &TD = TM.getTargetData();
switch (CE->getOpcode()) {
case Instruction::GetElementPtr: {
// generate a symbolic expression for the byte address
const Constant *ptrVal = CE->getOperand(0);
std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
if (unsigned Offset = TD.getIndexedOffset(ptrVal->getType(), idxVec)) {
O << "(";
emitConstantValueOnly(ptrVal);
O << ") + " << Offset;
} else {
emitConstantValueOnly(ptrVal);
}
break;
}
case Instruction::Cast: {
// Support only non-converting or widening casts for now, that is, ones
// that do not involve a change in value. This assertion is really gross,
// and may not even be a complete check.
Constant *Op = CE->getOperand(0);
const Type *OpTy = Op->getType(), *Ty = CE->getType();
// Remember, kids, pointers on x86 can be losslessly converted back and
// forth into 32-bit or wider integers, regardless of signedness. :-P
assert(((isa<PointerType>(OpTy)
&& (Ty == Type::LongTy || Ty == Type::ULongTy
|| Ty == Type::IntTy || Ty == Type::UIntTy))
|| (isa<PointerType>(Ty)
&& (OpTy == Type::LongTy || OpTy == Type::ULongTy
|| OpTy == Type::IntTy || OpTy == Type::UIntTy))
|| (((TD.getTypeSize(Ty) >= TD.getTypeSize(OpTy))
&& OpTy->isLosslesslyConvertibleTo(Ty))))
&& "FIXME: Don't yet support this kind of constant cast expr");
O << "(";
emitConstantValueOnly(Op);
O << ")";
break;
}
case Instruction::Add:
O << "(";
emitConstantValueOnly(CE->getOperand(0));
O << ") + (";
emitConstantValueOnly(CE->getOperand(1));
O << ")";
break;
default:
assert(0 && "Unsupported operator!");
}
} else {
assert(0 && "Unknown constant value!");
}
}
// Print a constant value or values, with the appropriate storage class as a
// prefix.
void Printer::emitGlobalConstant(const Constant *CV) {
const TargetData &TD = TM.getTargetData();
if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
if (isStringCompatible(CVA)) {
printAsCString(O, CVA);
} else { // Not a string. Print the values in successive locations
for (unsigned i=0, e = CVA->getNumOperands(); i != e; i++)
emitGlobalConstant(CVA->getOperand(i));
}
return;
} else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
// Print the fields in successive locations. Pad to align if needed!
const StructLayout *cvsLayout = TD.getStructLayout(CVS->getType());
unsigned sizeSoFar = 0;
for (unsigned i = 0, e = CVS->getNumOperands(); i != e; i++) {
const Constant* field = CVS->getOperand(i);
// Check if padding is needed and insert one or more 0s.
unsigned fieldSize = TD.getTypeSize(field->getType());
unsigned padSize = ((i == e-1? cvsLayout->StructSize
: cvsLayout->MemberOffsets[i+1])
- cvsLayout->MemberOffsets[i]) - fieldSize;
sizeSoFar += fieldSize + padSize;
// Now print the actual field value
emitGlobalConstant(field);
// Insert the field padding unless it's zero bytes...
if (padSize)
O << "\t.space\t " << padSize << "\n";
}
assert(sizeSoFar == cvsLayout->StructSize &&
"Layout of constant struct may be incorrect!");
return;
} else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
// FP Constants are printed as integer constants to avoid losing
// precision...
double Val = CFP->getValue();
switch (CFP->getType()->getTypeID()) {
default: assert(0 && "Unknown floating point type!");
case Type::FloatTyID: {
union FU { // Abide by C TBAA rules
float FVal;
unsigned UVal;
} U;
U.FVal = Val;
O << "\t.long " << U.UVal << "\t# float " << Val << "\n";
return;
}
case Type::DoubleTyID: {
union DU { // Abide by C TBAA rules
double FVal;
uint64_t UVal;
struct {
uint32_t MSWord;
uint32_t LSWord;
} T;
} U;
U.FVal = Val;
O << ".long " << U.T.MSWord << "\t# double most significant word "
<< Val << "\n";
O << ".long " << U.T.LSWord << "\t# double least significant word "
<< Val << "\n";
return;
}
}
} else if (CV->getType() == Type::ULongTy || CV->getType() == Type::LongTy) {
if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
union DU { // Abide by C TBAA rules
int64_t UVal;
struct {
uint32_t MSWord;
uint32_t LSWord;
} T;
} U;
U.UVal = CI->getRawValue();
O << ".long " << U.T.MSWord << "\t# Double-word most significant word "
<< U.UVal << "\n";
O << ".long " << U.T.LSWord << "\t# Double-word least significant word "
<< U.UVal << "\n";
return;
}
}
const Type *type = CV->getType();
O << "\t";
switch (type->getTypeID()) {
case Type::UByteTyID: case Type::SByteTyID:
O << "\t.byte";
break;
case Type::UShortTyID: case Type::ShortTyID:
O << "\t.short";
break;
case Type::BoolTyID:
case Type::PointerTyID:
case Type::UIntTyID: case Type::IntTyID:
O << "\t.long";
break;
case Type::ULongTyID: case Type::LongTyID:
assert (0 && "Should have already output double-word constant.");
case Type::FloatTyID: case Type::DoubleTyID:
assert (0 && "Should have already output floating point constant.");
default:
if (CV == Constant::getNullValue(type)) { // Zero initializer?
O << "\t.space " << TD.getTypeSize(type) << "\n";
return;
}
std::cerr << "Can't handle printing: " << *CV;
abort();
break;
}
O << ' ';
emitConstantValueOnly(CV);
O << '\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 Printer::printConstantPool(MachineConstantPool *MCP) {
const std::vector<Constant*> &CP = MCP->getConstants();
const TargetData &TD = TM.getTargetData();
if (CP.empty()) return;
for (unsigned i = 0, e = CP.size(); i != e; ++i) {
O << "\t.const\n";
O << "\t.align " << (unsigned)TD.getTypeAlignment(CP[i]->getType())
<< "\n";
O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t;"
<< *CP[i] << "\n";
emitGlobalConstant(CP[i]);
}
}
/// runOnMachineFunction - This uses the printMachineInstruction()
/// method to print assembly for each instruction.
///
bool Printer::runOnMachineFunction(MachineFunction &MF) {
CurrentFnName = MF.getFunction()->getName();
// Print out constants referenced by the function
printConstantPool(MF.getConstantPool());
// Print out header for the function.
O << "\t.csect .text[PR]\n"
<< "\t.align 2\n"
<< "\t.globl " << CurrentFnName << '\n'
<< "\t.globl ." << CurrentFnName << '\n'
<< "\t.csect " << CurrentFnName << "[DS],3\n"
<< CurrentFnName << ":\n"
<< "\t.llong ." << CurrentFnName << ", TOC[tc0], 0\n"
<< "\t.csect .text[PR]\n"
<< '.' << 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.
O << "LBB" << CurrentFnName << "_" << I->getNumber() << ":\t# "
<< 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);
}
}
++LabelNumber;
O << "LT.." << CurrentFnName << ":\n"
<< "\t.long 0\n"
<< "\t.byte 0,0,32,65,128,0,0,0\n"
<< "\t.long LT.." << CurrentFnName << "-." << CurrentFnName << '\n'
<< "\t.short 3\n"
<< "\t.byte \"" << CurrentFnName << "\"\n"
<< "\t.align 2\n";
// We didn't modify anything.
return false;
}
void Printer::printOp(const MachineOperand &MO,
bool elideOffsetKeyword /* = false */) {
const MRegisterInfo &RI = *TM.getRegisterInfo();
int new_symbol;
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: {
// On AIX, do not print out the 'R' (GPR) or 'F' (FPR) in reg names
const char *regName = RI.get(MO.getReg()).Name;
if (regName[0] == 'R' || regName[0] == 'F')
O << &regName[1];
else
O << regName;
return;
}
case MachineOperand::MO_SignExtendedImmed:
case MachineOperand::MO_UnextendedImmed:
std::cerr << "printOp() does not handle immediate values\n";
abort();
return;
case MachineOperand::MO_PCRelativeDisp:
std::cerr << "Shouldn't use addPCDisp() when building PPC MachineInstrs";
abort();
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_ConstantPoolIndex:
O << ".CPI" << CurrentFnName << "_" << MO.getConstantPoolIndex();
return;
case MachineOperand::MO_ExternalSymbol:
O << MO.getSymbolName();
return;
case MachineOperand::MO_GlobalAddress:
if (!elideOffsetKeyword) {
GlobalValue *GV = MO.getGlobal();
if (Function *F = dyn_cast<Function>(GV)) {
O << "." << F->getName();
} else if (GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) {
// output the label name
O << GVToLabelMap[GVar];
}
}
return;
default:
O << "<unknown operand type: " << MO.getType() << ">";
return;
}
}
void Printer::printImmOp(const MachineOperand &MO, unsigned ArgType) {
int Imm = MO.getImmedValue();
if (ArgType == PPCII::Simm16 || ArgType == PPCII::Disimm16) {
O << (short)Imm;
} else {
O << Imm;
}
}
/// printMachineInstruction -- Print out a single PPC LLVM instruction
/// MI in Darwin syntax to the current output stream.
///
void Printer::printMachineInstruction(const MachineInstr *MI) {
unsigned Opcode = MI->getOpcode();
const TargetInstrInfo &TII = *TM.getInstrInfo();
const TargetInstrDescriptor &Desc = TII.get(Opcode);
unsigned i;
unsigned ArgCount = MI->getNumOperands();
unsigned ArgType[] = {
(Desc.TSFlags >> PPCII::Arg0TypeShift) & PPCII::ArgTypeMask,
(Desc.TSFlags >> PPCII::Arg1TypeShift) & PPCII::ArgTypeMask,
(Desc.TSFlags >> PPCII::Arg2TypeShift) & PPCII::ArgTypeMask,
(Desc.TSFlags >> PPCII::Arg3TypeShift) & PPCII::ArgTypeMask,
(Desc.TSFlags >> PPCII::Arg4TypeShift) & PPCII::ArgTypeMask
};
assert(((Desc.TSFlags & PPCII::VMX) == 0) &&
"Instruction requires VMX support");
++EmittedInsts;
// CALLpcrel and CALLindirect are handled specially here to print only the
// appropriate number of args that the assembler expects. This is because
// may have many arguments appended to record the uses of registers that are
// holding arguments to the called function.
if (Opcode == PPC::COND_BRANCH) {
std::cerr << "Error: untranslated conditional branch psuedo instruction!\n";
abort();
} else if (Opcode == PPC::IMPLICIT_DEF) {
O << "# IMPLICIT DEF ";
printOp(MI->getOperand(0));
O << "\n";
return;
} else if (Opcode == PPC::CALLpcrel) {
O << TII.getName(Opcode) << " ";
printOp(MI->getOperand(0));
O << "\n";
return;
} else if (Opcode == PPC::CALLindirect) {
O << TII.getName(Opcode) << " ";
printImmOp(MI->getOperand(0), ArgType[0]);
O << ", ";
printImmOp(MI->getOperand(1), ArgType[0]);
O << "\n";
return;
} else if (Opcode == PPC::MovePCtoLR) {
// FIXME: should probably be converted to cout.width and cout.fill
O << "bl \"L0000" << LabelNumber << "$pb\"\n";
O << "\"L0000" << LabelNumber << "$pb\":\n";
O << "\tmflr ";
printOp(MI->getOperand(0));
O << "\n";
return;
}
O << TII.getName(Opcode) << " ";
if (Opcode == PPC::BLR || Opcode == PPC::NOP) {
O << "\n";
} else if (ArgCount == 3 &&
(ArgType[1] == PPCII::Disimm16 || ArgType[1] == PPCII::Disimm14)) {
printOp(MI->getOperand(0));
O << ", ";
MachineOperand MO = MI->getOperand(1);
if (MO.isImmediate())
printImmOp(MO, ArgType[1]);
else
printOp(MO);
O << "(";
printOp(MI->getOperand(2));
O << ")\n";
} else {
for (i = 0; i < ArgCount; ++i) {
// addi and friends
if (i == 1 && ArgCount == 3 && ArgType[2] == PPCII::Simm16 &&
MI->getOperand(1).hasAllocatedReg() &&
MI->getOperand(1).getReg() == PPC::R0) {
O << "0";
// for long branch support, bc $+8
} else if (i == 1 && ArgCount == 2 && MI->getOperand(1).isImmediate() &&
TII.isBranch(MI->getOpcode())) {
O << "$+8";
assert(8 == MI->getOperand(i).getImmedValue()
&& "branch off PC not to pc+8?");
//printOp(MI->getOperand(i));
} else if (MI->getOperand(i).isImmediate()) {
printImmOp(MI->getOperand(i), ArgType[i]);
} else {
printOp(MI->getOperand(i));
}
if (ArgCount - 1 == i)
O << "\n";
else
O << ", ";
}
}
}
// 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";
}
}
bool Printer::doInitialization(Module &M) {
const TargetData &TD = TM.getTargetData();
std::string CurSection;
O << "\t.machine \"ppc64\"\n"
<< "\t.toc\n"
<< "\t.csect .text[PR]\n";
// Print out module-level global variables
for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I) {
if (!I->hasInitializer())
continue;
std::string Name = I->getName();
Constant *C = I->getInitializer();
// N.B.: We are defaulting to writable strings
if (I->hasExternalLinkage()) {
O << "\t.globl " << Name << '\n'
<< "\t.csect .data[RW],3\n";
} else {
O << "\t.csect _global.rw_c[RW],3\n";
}
O << Name << ":\n";
emitGlobalConstant(C);
}
// Output labels for globals
if (M.gbegin() != M.gend()) O << "\t.toc\n";
for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I) {
const GlobalVariable *GV = I;
// Do not output labels for unused variables
if (GV->isExternal() && GV->use_begin() == GV->use_end())
continue;
std::string Name = GV->getName();
std::string Label = "LC.." + utostr(LabelNumber++);
GVToLabelMap[GV] = Label;
O << Label << ":\n"
<< "\t.tc " << Name << "[TC]," << Name;
if (GV->isExternal()) O << "[RW]";
O << '\n';
}
Mang = new Mangler(M, true);
return false; // success
}
bool Printer::doFinalization(Module &M) {
const TargetData &TD = TM.getTargetData();
// Print out module-level global variables
for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I) {
if (I->hasInitializer() || I->hasExternalLinkage())
continue;
std::string Name = I->getName();
if (I->hasInternalLinkage()) {
O << "\t.lcomm " << Name << ",16,_global.bss_c";
} else {
O << "\t.comm " << Name << "," << TD.getTypeSize(I->getType())
<< "," << log2((unsigned)TD.getTypeAlignment(I->getType()));
}
O << "\t\t# ";
WriteAsOperand(O, I, true, true, &M);
O << "\n";
}
O << "_section_.text:\n"
<< "\t.csect .data[RW],3\n"
<< "\t.llong _section_.text\n";
delete Mang;
return false; // success
}
} // End llvm namespace
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