mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-19 03:29:22 +00:00
Add support for emitting AT&T style .s files, and make it the default. Users
may now choose their output format with the -x86-asm-syntax={intel|att} flag.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16646 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
8f99eff156
commit
ac5701c562
@ -34,6 +34,127 @@
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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static bool isScale(const MachineOperand &MO) {
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return MO.isImmediate() &&
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(MO.getImmedValue() == 1 || MO.getImmedValue() == 2 ||
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MO.getImmedValue() == 4 || MO.getImmedValue() == 8);
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}
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static bool isMem(const MachineInstr *MI, unsigned Op) {
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if (MI->getOperand(Op).isFrameIndex()) return true;
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if (MI->getOperand(Op).isConstantPoolIndex()) return true;
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return Op+4 <= MI->getNumOperands() &&
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MI->getOperand(Op ).isRegister() && isScale(MI->getOperand(Op+1)) &&
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MI->getOperand(Op+2).isRegister() && MI->getOperand(Op+3).isImmediate();
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}
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// SwitchSection - Switch to the specified section of the executable if we are
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// not already in it!
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//
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static void SwitchSection(std::ostream &OS, std::string &CurSection,
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const char *NewSection) {
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if (CurSection != NewSection) {
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CurSection = NewSection;
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if (!CurSection.empty())
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OS << "\t" << NewSection << "\n";
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}
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}
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namespace {
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struct X86SharedAsmPrinter : public AsmPrinter {
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X86SharedAsmPrinter(std::ostream &O, TargetMachine &TM)
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: AsmPrinter(O, TM) { }
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void printConstantPool(MachineConstantPool *MCP);
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bool doFinalization(Module &M);
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};
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}
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/// printConstantPool - Print to the current output stream assembly
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/// representations of the constants in the constant pool MCP. This is
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/// used to print out constants which have been "spilled to memory" by
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/// the code generator.
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///
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void X86SharedAsmPrinter::printConstantPool(MachineConstantPool *MCP) {
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const std::vector<Constant*> &CP = MCP->getConstants();
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const TargetData &TD = TM.getTargetData();
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if (CP.empty()) return;
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for (unsigned i = 0, e = CP.size(); i != e; ++i) {
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O << "\t.section .rodata\n";
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emitAlignment(TD.getTypeAlignmentShift(CP[i]->getType()));
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O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t" << CommentString
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<< *CP[i] << "\n";
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emitGlobalConstant(CP[i]);
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}
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}
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bool X86SharedAsmPrinter::doFinalization(Module &M) {
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const TargetData &TD = TM.getTargetData();
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std::string CurSection;
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// Print out module-level global variables here.
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for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
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if (I->hasInitializer()) { // External global require no code
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O << "\n\n";
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std::string name = Mang->getValueName(I);
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Constant *C = I->getInitializer();
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unsigned Size = TD.getTypeSize(C->getType());
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unsigned Align = TD.getTypeAlignmentShift(C->getType());
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if (C->isNullValue() &&
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(I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
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I->hasWeakLinkage() /* FIXME: Verify correct */)) {
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SwitchSection(O, CurSection, ".data");
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if (I->hasInternalLinkage())
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O << "\t.local " << name << "\n";
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O << "\t.comm " << name << "," << TD.getTypeSize(C->getType())
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<< "," << (1 << Align);
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O << "\t\t# ";
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WriteAsOperand(O, I, true, true, &M);
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O << "\n";
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} else {
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switch (I->getLinkage()) {
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case GlobalValue::LinkOnceLinkage:
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case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
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// Nonnull linkonce -> weak
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O << "\t.weak " << name << "\n";
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SwitchSection(O, CurSection, "");
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O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
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break;
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case GlobalValue::AppendingLinkage:
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// FIXME: appending linkage variables should go into a section of
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// their name or something. For now, just emit them as external.
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case GlobalValue::ExternalLinkage:
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// If external or appending, declare as a global symbol
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O << "\t.globl " << name << "\n";
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// FALL THROUGH
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case GlobalValue::InternalLinkage:
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if (C->isNullValue())
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SwitchSection(O, CurSection, ".bss");
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else
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SwitchSection(O, CurSection, ".data");
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break;
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}
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emitAlignment(Align);
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O << "\t.type " << name << ",@object\n";
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O << "\t.size " << name << "," << Size << "\n";
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O << name << ":\t\t\t\t# ";
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WriteAsOperand(O, I, true, true, &M);
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O << " = ";
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WriteAsOperand(O, C, false, false, &M);
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O << "\n";
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emitGlobalConstant(C);
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}
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}
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AsmPrinter::doFinalization(M);
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return false; // success
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}
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namespace {
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Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
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enum AsmWriterFlavor { att, intel };
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@ -42,10 +163,10 @@ namespace {
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AsmWriterFlavor("x86-asm-syntax",
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cl::desc("Choose style of code to emit from X86 backend:"),
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cl::values(
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clEnumVal(att, " Emit AT&T Style"),
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clEnumVal(intel, " Emit Intel Style"),
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clEnumVal(att, " Emit AT&T-style assembly"),
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clEnumVal(intel, " Emit Intel-style assembly"),
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clEnumValEnd),
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cl::init(intel));
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cl::init(att));
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struct GasBugWorkaroundEmitter : public MachineCodeEmitter {
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GasBugWorkaroundEmitter(std::ostream& o)
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@ -77,11 +198,12 @@ namespace {
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bool firstByte;
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};
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struct X86IntelAsmPrinter : public AsmPrinter {
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X86IntelAsmPrinter(std::ostream &O, TargetMachine &TM) : AsmPrinter(O, TM) { }
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struct X86IntelAsmPrinter : public X86SharedAsmPrinter {
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X86IntelAsmPrinter(std::ostream &O, TargetMachine &TM)
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: X86SharedAsmPrinter(O, TM) { }
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virtual const char *getPassName() const {
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return "X86 Assembly Printer";
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return "X86 Intel-Style Assembly Printer";
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}
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/// printInstruction - This method is automatically generated by tablegen
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@ -125,52 +247,16 @@ namespace {
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void printMachineInstruction(const MachineInstr *MI);
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void printOp(const MachineOperand &MO, bool elideOffsetKeyword = false);
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void printMemReference(const MachineInstr *MI, unsigned Op);
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void printConstantPool(MachineConstantPool *MCP);
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bool runOnMachineFunction(MachineFunction &F);
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bool doInitialization(Module &M);
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bool doFinalization(Module &M);
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};
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} // end of anonymous namespace
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/// createX86CodePrinterPass - Returns a pass that prints the X86
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/// assembly code for a MachineFunction to the given output stream,
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/// using the given target machine description. This should work
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/// regardless of whether the function is in SSA form.
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///
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FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,TargetMachine &tm){
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if (AsmWriterFlavor != intel) {
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std::cerr << "AT&T syntax not fully implemented yet!\n";
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abort();
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}
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return new X86IntelAsmPrinter(o, tm);
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}
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// Include the auto-generated portion of the assembly writer.
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#include "X86GenIntelAsmWriter.inc"
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/// printConstantPool - Print to the current output stream assembly
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/// representations of the constants in the constant pool MCP. This is
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/// used to print out constants which have been "spilled to memory" by
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/// the code generator.
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///
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void X86IntelAsmPrinter::printConstantPool(MachineConstantPool *MCP) {
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const std::vector<Constant*> &CP = MCP->getConstants();
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const TargetData &TD = TM.getTargetData();
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if (CP.empty()) return;
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for (unsigned i = 0, e = CP.size(); i != e; ++i) {
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O << "\t.section .rodata\n";
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emitAlignment(TD.getTypeAlignmentShift(CP[i]->getType()));
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O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t" << CommentString
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<< *CP[i] << "\n";
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emitGlobalConstant(CP[i]);
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}
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}
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/// runOnMachineFunction - This uses the printMachineInstruction()
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/// method to print assembly for each instruction.
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///
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@ -206,24 +292,8 @@ bool X86IntelAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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return false;
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}
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static bool isScale(const MachineOperand &MO) {
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return MO.isImmediate() &&
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(MO.getImmedValue() == 1 || MO.getImmedValue() == 2 ||
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MO.getImmedValue() == 4 || MO.getImmedValue() == 8);
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}
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static bool isMem(const MachineInstr *MI, unsigned Op) {
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if (MI->getOperand(Op).isFrameIndex()) return true;
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if (MI->getOperand(Op).isConstantPoolIndex()) return true;
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return Op+4 <= MI->getNumOperands() &&
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MI->getOperand(Op ).isRegister() && isScale(MI->getOperand(Op+1)) &&
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MI->getOperand(Op+2).isRegister() && MI->getOperand(Op+3).isImmediate();
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}
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void X86IntelAsmPrinter::printOp(const MachineOperand &MO,
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bool elideOffsetKeyword /* = false */) {
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bool elideOffsetKeyword /* = false */) {
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const MRegisterInfo &RI = *TM.getRegisterInfo();
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switch (MO.getType()) {
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case MachineOperand::MO_VirtualRegister:
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@ -268,7 +338,7 @@ void X86IntelAsmPrinter::printOp(const MachineOperand &MO,
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}
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}
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void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op) {
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void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op){
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assert(isMem(MI, Op) && "Invalid memory reference!");
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if (MI->getOperand(Op).isFrameIndex()) {
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@ -378,79 +448,188 @@ bool X86IntelAsmPrinter::doInitialization(Module &M) {
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return false;
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}
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// SwitchSection - Switch to the specified section of the executable if we are
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// not already in it!
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//
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static void SwitchSection(std::ostream &OS, std::string &CurSection,
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const char *NewSection) {
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if (CurSection != NewSection) {
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CurSection = NewSection;
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if (!CurSection.empty())
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OS << "\t" << NewSection << "\n";
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namespace {
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struct X86ATTAsmPrinter : public X86SharedAsmPrinter {
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X86ATTAsmPrinter(std::ostream &O, TargetMachine &TM)
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: X86SharedAsmPrinter(O, TM) { }
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virtual const char *getPassName() const {
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return "X86 AT&T-Style Assembly Printer";
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}
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/// printInstruction - This method is automatically generated by tablegen
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/// from the instruction set description. This method returns true if the
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/// machine instruction was sufficiently described to print it, otherwise it
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/// returns false.
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bool printInstruction(const MachineInstr *MI);
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// This method is used by the tablegen'erated instruction printer.
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void printOperand(const MachineInstr *MI, unsigned OpNo, MVT::ValueType VT){
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printOp(MI->getOperand(OpNo));
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}
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void printCallOperand(const MachineInstr *MI, unsigned OpNo,
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MVT::ValueType VT) {
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printOp(MI->getOperand(OpNo), true); // Don't print '$' prefix.
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}
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void printMemoryOperand(const MachineInstr *MI, unsigned OpNo,
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MVT::ValueType VT) {
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printMemReference(MI, OpNo);
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}
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void printMachineInstruction(const MachineInstr *MI);
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void printOp(const MachineOperand &MO, bool isCallOperand = false);
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void printMemReference(const MachineInstr *MI, unsigned Op);
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bool runOnMachineFunction(MachineFunction &F);
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};
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} // end of anonymous namespace
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// Include the auto-generated portion of the assembly writer.
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#include "X86GenATTAsmWriter.inc"
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/// runOnMachineFunction - This uses the printMachineInstruction()
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/// method to print assembly for each instruction.
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///
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bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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setupMachineFunction(MF);
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O << "\n\n";
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// Print out constants referenced by the function
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printConstantPool(MF.getConstantPool());
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// Print out labels for the function.
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O << "\t.text\n";
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emitAlignment(4);
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O << "\t.globl\t" << CurrentFnName << "\n";
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O << "\t.type\t" << CurrentFnName << ", @function\n";
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O << CurrentFnName << ":\n";
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// Print out code for the function.
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for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
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I != E; ++I) {
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// Print a label for the basic block.
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O << ".LBB" << CurrentFnName << "_" << I->getNumber() << ":\t"
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<< CommentString << " " << I->getBasicBlock()->getName() << "\n";
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for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
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II != E; ++II) {
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// Print the assembly for the instruction.
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O << "\t";
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printMachineInstruction(II);
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}
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}
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// We didn't modify anything.
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return false;
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}
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void X86ATTAsmPrinter::printOp(const MachineOperand &MO, bool isCallOp) {
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const MRegisterInfo &RI = *TM.getRegisterInfo();
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switch (MO.getType()) {
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case MachineOperand::MO_VirtualRegister:
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case MachineOperand::MO_MachineRegister:
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assert(MRegisterInfo::isPhysicalRegister(MO.getReg()) &&
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"Virtual registers should not make it this far!");
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O << '%';
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for (const char *Name = RI.get(MO.getReg()).Name; *Name; ++Name)
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O << (char)tolower(*Name);
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return;
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case MachineOperand::MO_SignExtendedImmed:
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case MachineOperand::MO_UnextendedImmed:
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O << '$' << (int)MO.getImmedValue();
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return;
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case MachineOperand::MO_MachineBasicBlock: {
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MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
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O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction())
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<< "_" << MBBOp->getNumber () << "\t# "
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<< MBBOp->getBasicBlock ()->getName ();
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return;
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}
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case MachineOperand::MO_PCRelativeDisp:
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std::cerr << "Shouldn't use addPCDisp() when building X86 MachineInstrs";
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abort ();
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return;
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case MachineOperand::MO_GlobalAddress:
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if (!isCallOp) O << '$';
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O << Mang->getValueName(MO.getGlobal());
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return;
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case MachineOperand::MO_ExternalSymbol:
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if (!isCallOp) O << '$';
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O << MO.getSymbolName();
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return;
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default:
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O << "<unknown operand type>"; return;
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}
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}
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bool X86IntelAsmPrinter::doFinalization(Module &M) {
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const TargetData &TD = TM.getTargetData();
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std::string CurSection;
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void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op){
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assert(isMem(MI, Op) && "Invalid memory reference!");
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// Print out module-level global variables here.
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for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
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if (I->hasInitializer()) { // External global require no code
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O << "\n\n";
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std::string name = Mang->getValueName(I);
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Constant *C = I->getInitializer();
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unsigned Size = TD.getTypeSize(C->getType());
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unsigned Align = TD.getTypeAlignmentShift(C->getType());
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if (MI->getOperand(Op).isFrameIndex()) {
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O << "[frame slot #" << MI->getOperand(Op).getFrameIndex();
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if (MI->getOperand(Op+3).getImmedValue())
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O << " + " << MI->getOperand(Op+3).getImmedValue();
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O << "]";
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return;
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} else if (MI->getOperand(Op).isConstantPoolIndex()) {
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O << ".CPI" << CurrentFnName << "_"
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<< MI->getOperand(Op).getConstantPoolIndex();
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if (MI->getOperand(Op+3).getImmedValue())
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O << " + " << MI->getOperand(Op+3).getImmedValue();
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return;
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}
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if (C->isNullValue() &&
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(I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
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I->hasWeakLinkage() /* FIXME: Verify correct */)) {
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SwitchSection(O, CurSection, ".data");
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if (I->hasInternalLinkage())
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O << "\t.local " << name << "\n";
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O << "\t.comm " << name << "," << TD.getTypeSize(C->getType())
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<< "," << (1 << Align);
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O << "\t\t# ";
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WriteAsOperand(O, I, true, true, &M);
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O << "\n";
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} else {
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switch (I->getLinkage()) {
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case GlobalValue::LinkOnceLinkage:
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case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
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// Nonnull linkonce -> weak
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O << "\t.weak " << name << "\n";
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SwitchSection(O, CurSection, "");
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O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
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break;
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case GlobalValue::AppendingLinkage:
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// FIXME: appending linkage variables should go into a section of
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// their name or something. For now, just emit them as external.
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case GlobalValue::ExternalLinkage:
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// If external or appending, declare as a global symbol
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O << "\t.globl " << name << "\n";
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// FALL THROUGH
|
||||
case GlobalValue::InternalLinkage:
|
||||
if (C->isNullValue())
|
||||
SwitchSection(O, CurSection, ".bss");
|
||||
else
|
||||
SwitchSection(O, CurSection, ".data");
|
||||
break;
|
||||
}
|
||||
const MachineOperand &BaseReg = MI->getOperand(Op);
|
||||
int ScaleVal = MI->getOperand(Op+1).getImmedValue();
|
||||
const MachineOperand &IndexReg = MI->getOperand(Op+2);
|
||||
int DispVal = MI->getOperand(Op+3).getImmedValue();
|
||||
|
||||
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);
|
||||
}
|
||||
}
|
||||
if (DispVal) O << DispVal;
|
||||
|
||||
AsmPrinter::doFinalization(M);
|
||||
return false; // success
|
||||
O << "(";
|
||||
if (BaseReg.getReg())
|
||||
printOp(BaseReg);
|
||||
|
||||
if (IndexReg.getReg()) {
|
||||
O << ",";
|
||||
printOp(IndexReg);
|
||||
if (ScaleVal != 1)
|
||||
O << "," << ScaleVal;
|
||||
}
|
||||
|
||||
O << ")";
|
||||
}
|
||||
|
||||
|
||||
/// printMachineInstruction -- Print out a single X86 LLVM instruction
|
||||
/// MI in Intel syntax to the current output stream.
|
||||
///
|
||||
void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
|
||||
++EmittedInsts;
|
||||
// Call the autogenerated instruction printer routines.
|
||||
if (!printInstruction(MI)) {
|
||||
MI->dump();
|
||||
assert(0 && "Do not know how to print this instruction!");
|
||||
abort();
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/// createX86CodePrinterPass - Returns a pass that prints the X86 assembly code
|
||||
/// for a MachineFunction to the given output stream, using the given target
|
||||
/// machine description.
|
||||
///
|
||||
FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,TargetMachine &tm){
|
||||
switch (AsmWriterFlavor) {
|
||||
default: assert(0 && "Unknown asm flavor!");
|
||||
case intel:
|
||||
return new X86IntelAsmPrinter(o, tm);
|
||||
case att:
|
||||
return new X86ATTAsmPrinter(o, tm);
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user