// 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
+// report in bugzilla. FYI, the not too bad 'ias' assembler is bundled with
// the Intel C/C++ compiler for Itanium Linux.
//
//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "asm-printer"
#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/TargetAsmInfo.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
-}
+STATISTIC(EmittedInsts, "Number of machine instrs printed");
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=")";
+ struct IA64AsmPrinter : public AsmPrinter {
+ std::set<std::string> ExternalFunctionNames, ExternalObjectNames;
+ IA64AsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
+ : AsmPrinter(O, TM, T) {
}
virtual const char *getPassName() const {
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){
+ void printOperand(const MachineInstr *MI, unsigned OpNo){
const MachineOperand &MO = MI->getOperand(OpNo);
- if (MO.getType() == MachineOperand::MO_MachineRegister) {
+ if (MO.getType() == MachineOperand::MO_Register) {
assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physref??");
//XXX Bug Workaround: See note in Printer::doInitialization about %.
O << TM.getRegisterInfo()->get(MO.getReg()).Name;
}
}
- void printS8ImmOperand(const MachineInstr *MI, unsigned OpNo,
- MVT::ValueType VT) {
+ void printS8ImmOperand(const MachineInstr *MI, unsigned OpNo) {
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) {
+ void printS14ImmOperand(const MachineInstr *MI, unsigned OpNo) {
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) {
+ void printS22ImmOperand(const MachineInstr *MI, unsigned OpNo) {
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) {
+ void printU64ImmOperand(const MachineInstr *MI, unsigned OpNo) {
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 printS64ImmOperand(const MachineInstr *MI, unsigned OpNo) {
+// XXX : nasty hack to avoid GPREL22 "relocation truncated to fit" linker
+// errors - instead of add rX = @gprel(CPI<whatever>), r1;; we now
+// emit movl rX = @gprel(CPI<whatever);;
+// add rX = rX, r1;
+// this gives us 64 bits instead of 22 (for the add long imm) to play
+// with, which shuts up the linker. The problem is that the constant
+// pool entries aren't immediates at this stage, so we check here.
+// If it's an immediate, print it the old fashioned way. If it's
+// not, we print it as a constant pool index.
+ if(MI->getOperand(OpNo).isImmediate()) {
+ O << (int64_t)MI->getOperand(OpNo).getImmedValue();
+ } else { // this is a constant pool reference: FIXME: assert this
+ printOp(MI->getOperand(OpNo));
+ }
+ }
+
+ void printGlobalOperand(const MachineInstr *MI, unsigned OpNo) {
+ printOp(MI->getOperand(OpNo), false); // this is NOT a br.call instruction
}
- void printCallOperand(const MachineInstr *MI, unsigned OpNo,
- MVT::ValueType VT) {
+ void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
printOp(MI->getOperand(OpNo), true); // this is a br.call instruction
}
+ std::string getSectionForFunction(const Function &F) const;
+
void printMachineInstruction(const MachineInstr *MI);
void printOp(const MachineOperand &MO, bool isBRCALLinsn= false);
bool runOnMachineFunction(MachineFunction &F);
bool doInitialization(Module &M);
+ bool doFinalization(Module &M);
};
} // end of anonymous namespace
#include "IA64GenAsmWriter.inc"
+std::string IA64AsmPrinter::getSectionForFunction(const Function &F) const {
+ // This means "Allocated instruXions in mem, initialized".
+ return "\n\t.section .text, \"ax\", \"progbits\"\n";
+}
+
/// runOnMachineFunction - This uses the printMachineInstruction()
/// method to print assembly for each instruction.
///
bool IA64AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
- setupMachineFunction(MF);
+ SetupMachineFunction(MF);
O << "\n\n";
// Print out constants referenced by the function
- printConstantPool(MF.getConstantPool());
+ EmitConstantPool(MF.getConstantPool());
+
+ const Function *F = MF.getFunction();
+ SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
// Print out labels for the function.
- O << "\n\t.section .text, \"ax\", \"progbits\"\n";
- // ^^ means "Allocated instruXions in mem, initialized"
- emitAlignment(5);
+ EmitAlignment(5);
O << "\t.global\t" << CurrentFnName << "\n";
O << "\t.type\t" << CurrentFnName << ", @function\n";
O << CurrentFnName << ":\n";
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";
+ if (!I->pred_empty()) {
+ printBasicBlockLabel(I, true);
+ O << '\n';
+ }
for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
II != E; ++II) {
// Print the assembly for the instruction.
}
void IA64AsmPrinter::printOp(const MachineOperand &MO,
- bool isBRCALLinsn /* = false */) {
+ 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: {
+ case MachineOperand::MO_Register:
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 ();
+ case MachineOperand::MO_Immediate:
+ O << MO.getImmedValue();
return;
- }
- case MachineOperand::MO_PCRelativeDisp:
- std::cerr << "Shouldn't use addPCDisp() when building IA64 MachineInstrs";
- abort ();
+ case MachineOperand::MO_MachineBasicBlock:
+ printBasicBlockLabel(MO.getMachineBasicBlock());
return;
-
case MachineOperand::MO_ConstantPoolIndex: {
- O << "@gprel(.CPI" << CurrentFnName << "_"
+ O << "@gprel(" << TAI->getPrivateGlobalPrefix()
+ << "CPI" << getFunctionNumber() << "_"
<< MO.getConstantPoolIndex() << ")";
return;
}
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()*/)
+ // @ltoff(@fptr(X)) ?
+ if (F && !isBRCALLinsn /*&& F->isDeclaration()*/)
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())
+ if (F /*&& isBRCALLinsn*/ && F->isDeclaration())
ExternalFunctionNames.insert(Mang->getValueName(MO.getGlobal()));
else
- if(GV->isExternal()) // e.g. stuff like 'stdin'
- ExternalObjectNames.insert(Mang->getValueName(MO.getGlobal()));
+ if (GV->isDeclaration()) // 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(
+
+ if (Needfptr && !isBRCALLinsn)
+ O << "#))"; // close both fptr( and ltoff(
+ else {
+ if (Needfptr)
+ O << "#)"; // close only fptr(
+ if (!isBRCALLinsn)
+ O << "#)"; // close only ltoff(
+ }
+
int Offset = MO.getOffset();
if (Offset > 0)
O << " + " << Offset;
/// MI to the current output stream.
///
void IA64AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
-
++EmittedInsts;
// Call the autogenerated instruction printer routines.
}
bool IA64AsmPrinter::doInitialization(Module &M) {
- AsmPrinter::doInitialization(M);
+ bool Result = AsmPrinter::doInitialization(M);
O << "\n.ident \"LLVM-ia64\"\n\n"
- << "\t.psr lsb\n" // should be "msb" on HP-UX, for starters
+ << "\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;
+ << "\t.psr abi64\n"; // we only support 64 bits for now
+ return Result;
+}
+
+bool IA64AsmPrinter::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->getPreferredTypeAlignmentShift(C->getType());
+
+ if (C->isNullValue() &&
+ (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
+ I->hasWeakLinkage() /* FIXME: Verify correct */)) {
+ SwitchToDataSection(".data", I);
+ if (I->hasInternalLinkage()) {
+ O << "\t.lcomm " << name << "#," << TD->getABITypeSize(C->getType())
+ << "," << (1 << Align);
+ O << "\n";
+ } else {
+ O << "\t.common " << name << "#," << TD->getABITypeSize(C->getType())
+ << "," << (1 << 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";
+ O << "\t.section\t.llvm.linkonce.d." << name
+ << ", \"aw\", \"progbits\"\n";
+ SwitchToDataSection("", I);
+ 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:
+ SwitchToDataSection(C->isNullValue() ? ".bss" : ".data", I);
+ break;
+ case GlobalValue::GhostLinkage:
+ cerr << "GhostLinkage cannot appear in IA64AsmPrinter!\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!");
+ }
+
+ EmitAlignment(Align);
+ O << "\t.type " << name << ",@object\n";
+ O << "\t.size " << name << "," << Size << "\n";
+ O << name << ":\t\t\t\t// " << *C << "\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";
+
+ return AsmPrinter::doFinalization(M);
}
/// 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);
+FunctionPass *llvm::createIA64CodePrinterPass(std::ostream &o,
+ IA64TargetMachine &tm) {
+ return new IA64AsmPrinter(o, tm, tm.getTargetAsmInfo());
}
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