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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22388 91177308-0d34-0410-b5e6-96231b3b80d8
220 lines
7.6 KiB
C++
220 lines
7.6 KiB
C++
//===-- X86AsmPrinter.cpp - Convert X86 LLVM IR to X86 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 the shared super class printer that converts from our internal
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// representation of machine-dependent LLVM code to Intel and AT&T format
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// assembly language.
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// This printer is the output mechanism used by `llc'.
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//
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//===----------------------------------------------------------------------===//
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#include "X86ATTAsmPrinter.h"
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#include "X86IntelAsmPrinter.h"
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#include "X86.h"
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#include "llvm/Module.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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using namespace x86;
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Statistic<> llvm::x86::EmittedInsts("asm-printer",
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"Number of machine instrs printed");
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enum AsmWriterFlavorTy { att, intel };
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cl::opt<AsmWriterFlavorTy>
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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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/// doInitialization
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bool X86SharedAsmPrinter::doInitialization(Module& M) {
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bool leadingUnderscore = false;
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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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forDarwin = TT.find("darwin") != 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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#elif defined(__APPLE__)
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forDarwin = true;
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#elif defined(_WIN32)
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leadingUnderscore = true;
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#else
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leadingUnderscore = false;
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#endif
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}
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if (leadingUnderscore || forCygwin || forDarwin)
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GlobalPrefix = "_";
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if (forDarwin)
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AlignmentIsInBytes = false;
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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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if (forDarwin)
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O << "\t.data\n";
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else
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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(),
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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 && !forDarwin && I->hasInternalLinkage())
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O << "\t.local " << name << "\n";
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if (forDarwin && I->hasInternalLinkage())
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O << "\t.lcomm " << name << "," << Size << "," << Align;
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else
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O << "\t.comm " << name << "," << Size;
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if (!forCygwin && !forDarwin)
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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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default: assert(0 && "Unknown linkage type!");
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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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if (!forCygwin && !forDarwin) {
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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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if (forDarwin) {
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// Output stubs for external global variables
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if (GVStubs.begin() != GVStubs.end())
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O << "\t.non_lazy_symbol_pointer\n";
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for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end();
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i != e; ++i) {
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O << "L" << *i << "$non_lazy_ptr:\n";
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O << "\t.indirect_symbol " << *i << "\n";
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O << "\t.long\t0\n";
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}
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// Output stubs for dynamically-linked functions
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unsigned j = 1;
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for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
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i != e; ++i, ++j) {
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O << "\t.symbol_stub\n";
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O << "L" << *i << "$stub:\n";
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O << "\t.indirect_symbol " << *i << "\n";
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O << "\tjmp\t*L" << j << "$lz\n";
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O << "L" << *i << "$stub_binder:\n";
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O << "\tpushl\t$L" << j << "$lz\n";
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O << "\tjmp\tdyld_stub_binding_helper\n";
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O << "\t.section __DATA, __la_sym_ptr3,lazy_symbol_pointers\n";
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O << "L" << j << "$lz:\n";
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O << "\t.indirect_symbol " << *i << "\n";
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O << "\t.long\tL" << *i << "$stub_binder\n";
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}
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O << "\n";
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// Output stubs for link-once variables
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if (LinkOnceStubs.begin() != LinkOnceStubs.end())
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O << ".data\n.align 2\n";
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for (std::set<std::string>::iterator i = LinkOnceStubs.begin(),
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e = LinkOnceStubs.end(); i != e; ++i) {
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O << "L" << *i << "$non_lazy_ptr:\n"
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<< "\t.long\t" << *i << '\n';
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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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/// createX86CodePrinterPass - Returns a pass that prints the X86 assembly code
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/// for a MachineFunction to the given output stream, using the given target
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/// machine description.
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///
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FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,TargetMachine &tm){
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switch (AsmWriterFlavor) {
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default:
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assert(0 && "Unknown asm flavor!");
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case intel:
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return new X86IntelAsmPrinter(o, tm);
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case att:
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return new X86ATTAsmPrinter(o, tm);
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}
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}
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