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* Convert tabs to spaces llvm-svn: 21426
638 lines
20 KiB
C++
638 lines
20 KiB
C++
//===-- X86AsmPrinter.cpp - Convert X86 LLVM code to Intel assembly -------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a printer that converts from our internal representation
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// of machine-dependent LLVM code to Intel and AT&T format assembly
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// language. This printer is the output mechanism used by `llc' and `lli
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// -print-machineinstrs' on X86.
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//
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//===----------------------------------------------------------------------===//
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#include "X86.h"
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#include "X86TargetMachine.h"
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#include "llvm/Module.h"
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#include "llvm/Type.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/ValueTypes.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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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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cl::opt<AsmWriterFlavor>
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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 assembly"),
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clEnumVal(intel, " Emit Intel-style assembly"),
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clEnumValEnd),
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cl::init(att));
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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), forCygwin(false) { }
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bool doInitialization(Module &M);
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void printConstantPool(MachineConstantPool *MCP);
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bool doFinalization(Module &M);
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bool forCygwin;
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};
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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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MI->getOperand(Op+3).isGlobalAddress());
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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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/// doInitialization - determine
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bool X86SharedAsmPrinter::doInitialization(Module& M) {
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forCygwin = false;
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const std::string& TT = M.getTargetTriple();
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if (TT.length() > 5)
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forCygwin = TT.find("cygwin") != std::string::npos ||
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TT.find("mingw") != std::string::npos;
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else if (TT.empty()) {
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#if defined(__CYGWIN__) || defined(__MINGW32__)
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forCygwin = true;
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#else
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forCygwin = false;
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#endif
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}
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if (forCygwin)
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GlobalPrefix = "_";
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return AsmPrinter::doInitialization(M);
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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_global_iterator I = M.global_begin(), E = M.global_end(); 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 (!forCygwin && 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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if (!forCygwin)
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O << "," << (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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case GlobalValue::GhostLinkage:
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std::cerr << "GhostLinkage cannot appear in X86AsmPrinter!\n";
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abort();
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}
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emitAlignment(Align);
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if (!forCygwin) {
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O << "\t.type " << name << ",@object\n";
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O << "\t.size " << name << "," << Size << "\n";
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}
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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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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 Intel-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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const MachineOperand &MO = MI->getOperand(OpNo);
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if (MO.getType() == MachineOperand::MO_MachineRegister) {
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assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physref??");
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// Bug Workaround: See note in Printer::doInitialization about %.
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O << "%" << TM.getRegisterInfo()->get(MO.getReg()).Name;
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} else {
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printOp(MO);
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}
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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 "OFFSET".
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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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switch (VT) {
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default: assert(0 && "Unknown arg size!");
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case MVT::i8: O << "BYTE PTR "; break;
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case MVT::i16: O << "WORD PTR "; break;
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case MVT::i32:
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case MVT::f32: O << "DWORD PTR "; break;
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case MVT::i64:
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case MVT::f64: O << "QWORD PTR "; break;
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case MVT::f80: O << "XWORD PTR "; break;
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}
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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 elideOffsetKeyword = false);
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void printMemReference(const MachineInstr *MI, unsigned Op);
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bool runOnMachineFunction(MachineFunction &F);
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bool doInitialization(Module &M);
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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 "X86GenAsmWriter1.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 X86IntelAsmPrinter::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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if (!forCygwin)
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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 if there are any predecessors.
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if (I->pred_begin() != I->pred_end())
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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 X86IntelAsmPrinter::printOp(const MachineOperand &MO,
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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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if (Value *V = MO.getVRegValueOrNull()) {
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O << "<" << V->getName() << ">";
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return;
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}
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// FALLTHROUGH
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case MachineOperand::MO_MachineRegister:
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if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
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// Bug Workaround: See note in Printer::doInitialization about %.
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O << "%" << RI.get(MO.getReg()).Name;
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else
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O << "%reg" << MO.getReg();
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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 (!elideOffsetKeyword)
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O << "OFFSET ";
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O << Mang->getValueName(MO.getGlobal());
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int Offset = MO.getOffset();
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if (Offset > 0)
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O << " + " << Offset;
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else if (Offset < 0)
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O << " - " << -Offset;
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return;
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}
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case MachineOperand::MO_ExternalSymbol:
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O << GlobalPrefix << 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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void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op){
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assert(isMem(MI, Op) && "Invalid memory reference!");
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const MachineOperand &BaseReg = MI->getOperand(Op);
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int ScaleVal = MI->getOperand(Op+1).getImmedValue();
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const MachineOperand &IndexReg = MI->getOperand(Op+2);
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const MachineOperand &DispSpec = MI->getOperand(Op+3);
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if (BaseReg.isFrameIndex()) {
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O << "[frame slot #" << BaseReg.getFrameIndex();
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if (DispSpec.getImmedValue())
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O << " + " << DispSpec.getImmedValue();
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O << "]";
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return;
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} else if (BaseReg.isConstantPoolIndex()) {
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O << "[.CPI" << CurrentFnName << "_"
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<< BaseReg.getConstantPoolIndex();
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if (IndexReg.getReg()) {
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O << " + ";
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if (ScaleVal != 1)
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O << ScaleVal << "*";
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printOp(IndexReg);
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}
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if (DispSpec.getImmedValue())
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O << " + " << DispSpec.getImmedValue();
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O << "]";
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return;
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}
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O << "[";
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bool NeedPlus = false;
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if (BaseReg.getReg()) {
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printOp(BaseReg, true);
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NeedPlus = true;
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}
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if (IndexReg.getReg()) {
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if (NeedPlus) O << " + ";
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if (ScaleVal != 1)
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O << ScaleVal << "*";
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printOp(IndexReg);
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NeedPlus = true;
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}
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if (DispSpec.isGlobalAddress()) {
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if (NeedPlus)
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O << " + ";
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printOp(DispSpec, true);
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} else {
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int DispVal = DispSpec.getImmedValue();
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if (DispVal || (!BaseReg.getReg() && !IndexReg.getReg())) {
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if (NeedPlus)
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if (DispVal > 0)
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O << " + ";
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else {
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O << " - ";
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DispVal = -DispVal;
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}
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O << DispVal;
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}
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}
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O << "]";
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}
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/// printMachineInstruction -- Print out a single X86 LLVM instruction
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/// MI in Intel syntax to the current output stream.
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///
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void X86IntelAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
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++EmittedInsts;
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// Call the autogenerated instruction printer routines.
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printInstruction(MI);
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}
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bool X86IntelAsmPrinter::doInitialization(Module &M) {
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AsmPrinter::doInitialization(M);
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// Tell gas we are outputting Intel syntax (not AT&T syntax) assembly.
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//
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// Bug: gas in `intel_syntax noprefix' mode interprets the symbol `Sp' in an
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// instruction as a reference to the register named sp, and if you try to
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// reference a symbol `Sp' (e.g. `mov ECX, OFFSET Sp') then it gets lowercased
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// before being looked up in the symbol table. This creates spurious
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// `undefined symbol' errors when linking. Workaround: Do not use `noprefix'
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// mode, and decorate all register names with percent signs.
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O << "\t.intel_syntax\n";
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return false;
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}
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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 "X86GenAsmWriter.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);
|
|
O << "\t.globl\t" << CurrentFnName << "\n";
|
|
if (!forCygwin)
|
|
O << "\t.type\t" << CurrentFnName << ", @function\n";
|
|
O << 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.
|
|
if (I->pred_begin() != I->pred_end())
|
|
O << ".LBB" << CurrentFnName << "_" << I->getNumber() << ":\t"
|
|
<< CommentString << " " << 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);
|
|
}
|
|
}
|
|
|
|
// We didn't modify anything.
|
|
return false;
|
|
}
|
|
|
|
void X86ATTAsmPrinter::printOp(const MachineOperand &MO, bool isCallOp) {
|
|
const MRegisterInfo &RI = *TM.getRegisterInfo();
|
|
switch (MO.getType()) {
|
|
case MachineOperand::MO_VirtualRegister:
|
|
case MachineOperand::MO_MachineRegister:
|
|
assert(MRegisterInfo::isPhysicalRegister(MO.getReg()) &&
|
|
"Virtual registers should not make it this far!");
|
|
O << '%';
|
|
for (const char *Name = RI.get(MO.getReg()).Name; *Name; ++Name)
|
|
O << (char)tolower(*Name);
|
|
return;
|
|
|
|
case MachineOperand::MO_SignExtendedImmed:
|
|
case MachineOperand::MO_UnextendedImmed:
|
|
O << '$' << (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 ();
|
|
return;
|
|
}
|
|
case MachineOperand::MO_PCRelativeDisp:
|
|
std::cerr << "Shouldn't use addPCDisp() when building X86 MachineInstrs";
|
|
abort ();
|
|
return;
|
|
case MachineOperand::MO_GlobalAddress: {
|
|
if (!isCallOp) O << '$';
|
|
O << Mang->getValueName(MO.getGlobal());
|
|
int Offset = MO.getOffset();
|
|
if (Offset > 0)
|
|
O << "+" << Offset;
|
|
else if (Offset < 0)
|
|
O << Offset;
|
|
return;
|
|
}
|
|
case MachineOperand::MO_ExternalSymbol:
|
|
if (!isCallOp) O << '$';
|
|
O << GlobalPrefix << MO.getSymbolName();
|
|
return;
|
|
default:
|
|
O << "<unknown operand type>"; return;
|
|
}
|
|
}
|
|
|
|
void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op){
|
|
assert(isMem(MI, Op) && "Invalid memory reference!");
|
|
|
|
const MachineOperand &BaseReg = MI->getOperand(Op);
|
|
int ScaleVal = MI->getOperand(Op+1).getImmedValue();
|
|
const MachineOperand &IndexReg = MI->getOperand(Op+2);
|
|
const MachineOperand &DispSpec = MI->getOperand(Op+3);
|
|
|
|
if (BaseReg.isFrameIndex()) {
|
|
O << "[frame slot #" << BaseReg.getFrameIndex();
|
|
if (DispSpec.getImmedValue())
|
|
O << " + " << DispSpec.getImmedValue();
|
|
O << "]";
|
|
return;
|
|
} else if (BaseReg.isConstantPoolIndex()) {
|
|
O << ".CPI" << CurrentFnName << "_"
|
|
<< BaseReg.getConstantPoolIndex();
|
|
if (DispSpec.getImmedValue())
|
|
O << "+" << DispSpec.getImmedValue();
|
|
if (IndexReg.getReg()) {
|
|
O << "(,";
|
|
printOp(IndexReg);
|
|
if (ScaleVal != 1)
|
|
O << "," << ScaleVal;
|
|
O << ")";
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (DispSpec.isGlobalAddress()) {
|
|
printOp(DispSpec, true);
|
|
} else {
|
|
int DispVal = DispSpec.getImmedValue();
|
|
if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
|
|
O << DispVal;
|
|
}
|
|
|
|
if (IndexReg.getReg() || BaseReg.getReg()) {
|
|
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.
|
|
printInstruction(MI);
|
|
}
|
|
|
|
|
|
/// 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);
|
|
}
|
|
}
|