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llvm-6502/lib/Target/SystemZ/AsmPrinter/SystemZAsmPrinter.cpp
Chris Lattner e53a600f06 pass the mangler down into the various SectionForGlobal methods. 
No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77432 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-29 05:09:30 +00:00

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//===-- SystemZAsmPrinter.cpp - SystemZ 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 the SystemZ assembly language.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "SystemZ.h"
#include "SystemZInstrInfo.h"
#include "SystemZTargetMachine.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/CodeGen/MachineModuleInfo.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/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Mangler.h"
using namespace llvm;
STATISTIC(EmittedInsts, "Number of machine instrs printed");
namespace {
class VISIBILITY_HIDDEN SystemZAsmPrinter : public AsmPrinter {
public:
SystemZAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
const TargetAsmInfo *TAI, bool V)
: AsmPrinter(O, TM, TAI, V) {}
virtual const char *getPassName() const {
return "SystemZ Assembly Printer";
}
void printOperand(const MachineInstr *MI, int OpNum,
const char* Modifier = 0);
void printPCRelImmOperand(const MachineInstr *MI, int OpNum);
void printRIAddrOperand(const MachineInstr *MI, int OpNum,
const char* Modifier = 0);
void printRRIAddrOperand(const MachineInstr *MI, int OpNum,
const char* Modifier = 0);
void printS16ImmOperand(const MachineInstr *MI, int OpNum) {
O << (int16_t)MI->getOperand(OpNum).getImm();
}
void printS32ImmOperand(const MachineInstr *MI, int OpNum) {
O << (int32_t)MI->getOperand(OpNum).getImm();
}
bool printInstruction(const MachineInstr *MI); // autogenerated.
void printMachineInstruction(const MachineInstr * MI);
void emitFunctionHeader(const MachineFunction &MF);
bool runOnMachineFunction(MachineFunction &F);
void PrintGlobalVariable(const GlobalVariable* GVar);
void getAnalysisUsage(AnalysisUsage &AU) const {
AsmPrinter::getAnalysisUsage(AU);
AU.setPreservesAll();
}
};
} // end of anonymous namespace
#include "SystemZGenAsmWriter.inc"
void SystemZAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
unsigned FnAlign = MF.getAlignment();
const Function *F = MF.getFunction();
SwitchToSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
EmitAlignment(FnAlign, F);
switch (F->getLinkage()) {
default: assert(0 && "Unknown linkage type!");
case Function::InternalLinkage: // Symbols default to internal.
case Function::PrivateLinkage:
case Function::LinkerPrivateLinkage:
break;
case Function::ExternalLinkage:
O << "\t.globl\t" << CurrentFnName << '\n';
break;
case Function::LinkOnceAnyLinkage:
case Function::LinkOnceODRLinkage:
case Function::WeakAnyLinkage:
case Function::WeakODRLinkage:
O << "\t.weak\t" << CurrentFnName << '\n';
break;
}
printVisibility(CurrentFnName, F->getVisibility());
O << "\t.type\t" << CurrentFnName << ",@function\n"
<< CurrentFnName << ":\n";
}
bool SystemZAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
SetupMachineFunction(MF);
O << "\n\n";
// Print out constants referenced by the function
EmitConstantPool(MF.getConstantPool());
// Print the 'header' of function
emitFunctionHeader(MF);
// 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 (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
// This is an entry block or a block that's only reachable via a
// fallthrough edge. In non-VerboseAsm mode, don't print the label.
} else {
printBasicBlockLabel(I, true, true, VerboseAsm);
O << '\n';
}
for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
II != E; ++II)
// Print the assembly for the instruction.
printMachineInstruction(II);
}
if (TAI->hasDotTypeDotSizeDirective())
O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
// Print out jump tables referenced by the function.
EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
O.flush();
// We didn't modify anything
return false;
}
void SystemZAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
++EmittedInsts;
// Call the autogenerated instruction printer routines.
if (printInstruction(MI))
return;
llvm_unreachable("Unreachable!");
}
void SystemZAsmPrinter::printPCRelImmOperand(const MachineInstr *MI, int OpNum) {
const MachineOperand &MO = MI->getOperand(OpNum);
switch (MO.getType()) {
case MachineOperand::MO_Immediate:
O << MO.getImm();
return;
case MachineOperand::MO_MachineBasicBlock:
printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm);
return;
case MachineOperand::MO_GlobalAddress: {
const GlobalValue *GV = MO.getGlobal();
std::string Name = Mang->getMangledName(GV);
O << Name;
// Assemble calls via PLT for externally visible symbols if PIC.
if (TM.getRelocationModel() == Reloc::PIC_ &&
!GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
!GV->hasLocalLinkage())
O << "@PLT";
printOffset(MO.getOffset());
return;
}
case MachineOperand::MO_ExternalSymbol: {
std::string Name(TAI->getGlobalPrefix());
Name += MO.getSymbolName();
O << Name;
if (TM.getRelocationModel() == Reloc::PIC_)
O << "@PLT";
return;
}
default:
assert(0 && "Not implemented yet!");
}
}
void SystemZAsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
const char* Modifier) {
const MachineOperand &MO = MI->getOperand(OpNum);
switch (MO.getType()) {
case MachineOperand::MO_Register: {
assert (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
"Virtual registers should be already mapped!");
unsigned Reg = MO.getReg();
if (Modifier && strncmp(Modifier, "subreg", 6) == 0) {
if (strncmp(Modifier + 7, "even", 4) == 0)
Reg = TRI->getSubReg(Reg, SystemZ::SUBREG_EVEN);
else if (strncmp(Modifier + 7, "odd", 3) == 0)
Reg = TRI->getSubReg(Reg, SystemZ::SUBREG_ODD);
else
assert(0 && "Invalid subreg modifier");
}
O << '%' << TRI->getAsmName(Reg);
return;
}
case MachineOperand::MO_Immediate:
O << MO.getImm();
return;
case MachineOperand::MO_MachineBasicBlock:
printBasicBlockLabel(MO.getMBB());
return;
case MachineOperand::MO_JumpTableIndex:
O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
<< MO.getIndex();
return;
case MachineOperand::MO_ConstantPoolIndex:
O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
<< MO.getIndex();
printOffset(MO.getOffset());
break;
case MachineOperand::MO_GlobalAddress: {
const GlobalValue *GV = MO.getGlobal();
std::string Name = Mang->getMangledName(GV);
O << Name;
break;
}
case MachineOperand::MO_ExternalSymbol: {
std::string Name(TAI->getGlobalPrefix());
Name += MO.getSymbolName();
O << Name;
break;
}
default:
assert(0 && "Not implemented yet!");
}
switch (MO.getTargetFlags()) {
default:
llvm_unreachable("Unknown target flag on GV operand");
case SystemZII::MO_NO_FLAG:
break;
case SystemZII::MO_GOTENT: O << "@GOTENT"; break;
case SystemZII::MO_PLT: O << "@PLT"; break;
}
printOffset(MO.getOffset());
}
void SystemZAsmPrinter::printRIAddrOperand(const MachineInstr *MI, int OpNum,
const char* Modifier) {
const MachineOperand &Base = MI->getOperand(OpNum);
// Print displacement operand.
printOperand(MI, OpNum+1);
// Print base operand (if any)
if (Base.getReg()) {
O << '(';
printOperand(MI, OpNum);
O << ')';
}
}
void SystemZAsmPrinter::printRRIAddrOperand(const MachineInstr *MI, int OpNum,
const char* Modifier) {
const MachineOperand &Base = MI->getOperand(OpNum);
const MachineOperand &Index = MI->getOperand(OpNum+2);
// Print displacement operand.
printOperand(MI, OpNum+1);
// Print base operand (if any)
if (Base.getReg()) {
O << '(';
printOperand(MI, OpNum);
if (Index.getReg()) {
O << ',';
printOperand(MI, OpNum+2);
}
O << ')';
} else
assert(!Index.getReg() && "Should allocate base register first!");
}
/// PrintUnmangledNameSafely - Print out the printable characters in the name.
/// Don't print things like \\n or \\0.
static void PrintUnmangledNameSafely(const Value *V,
formatted_raw_ostream &OS) {
for (StringRef::iterator it = V->getName().begin(),
ie = V->getName().end(); it != ie; ++it)
if (isprint(*it))
OS << *it;
}
void SystemZAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
const TargetData *TD = TM.getTargetData();
if (!GVar->hasInitializer())
return; // External global require no code
// Check to see if this is a special global used by LLVM, if so, emit it.
if (EmitSpecialLLVMGlobal(GVar))
return;
std::string name = Mang->getMangledName(GVar);
Constant *C = GVar->getInitializer();
unsigned Size = TD->getTypeAllocSize(C->getType());
unsigned Align = std::max(1U, TD->getPreferredAlignmentLog(GVar));
printVisibility(name, GVar->getVisibility());
O << "\t.type\t" << name << ",@object\n";
SwitchToSection(getObjFileLowering().SectionForGlobal(GVar, Mang, TM));
if (C->isNullValue() && !GVar->hasSection() &&
!GVar->isThreadLocal() &&
(GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
if (GVar->hasLocalLinkage())
O << "\t.local\t" << name << '\n';
O << TAI->getCOMMDirective() << name << ',' << Size;
if (TAI->getCOMMDirectiveTakesAlignment())
O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
if (VerboseAsm) {
O << "\t\t" << TAI->getCommentString() << ' ';
PrintUnmangledNameSafely(GVar, O);
}
O << '\n';
return;
}
switch (GVar->getLinkage()) {
case GlobalValue::CommonLinkage:
case GlobalValue::LinkOnceAnyLinkage:
case GlobalValue::LinkOnceODRLinkage:
case GlobalValue::WeakAnyLinkage:
case GlobalValue::WeakODRLinkage:
O << "\t.weak\t" << name << '\n';
break;
case GlobalValue::DLLExportLinkage:
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::PrivateLinkage:
case GlobalValue::LinkerPrivateLinkage:
case GlobalValue::InternalLinkage:
break;
default:
assert(0 && "Unknown linkage type!");
}
// Use 16-bit alignment by default to simplify bunch of stuff
EmitAlignment(Align, GVar, 1);
O << name << ":";
if (VerboseAsm) {
O << "\t\t\t\t" << TAI->getCommentString() << ' ';
PrintUnmangledNameSafely(GVar, O);
}
O << '\n';
if (TAI->hasDotTypeDotSizeDirective())
O << "\t.size\t" << name << ", " << Size << '\n';
EmitGlobalConstant(C);
}
// Force static initialization.
extern "C" void LLVMInitializeSystemZAsmPrinter() {
RegisterAsmPrinter<SystemZAsmPrinter> X(TheSystemZTarget);
}
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