1 //===-- X86AsmPrinter.cpp - Convert X86 LLVM IR to X86 assembly -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file the shared super class printer that converts from our internal
11 // representation of machine-dependent LLVM code to Intel and AT&T format
13 // This printer is the output mechanism used by `llc'.
15 //===----------------------------------------------------------------------===//
17 #include "X86ATTAsmPrinter.h"
18 #include "X86IntelAsmPrinter.h"
20 #include "llvm/Module.h"
21 #include "llvm/Assembly/Writer.h"
22 #include "llvm/CodeGen/MachineConstantPool.h"
23 #include "llvm/Support/Mangler.h"
24 #include "llvm/Support/CommandLine.h"
28 Statistic<> llvm::x86::EmittedInsts("asm-printer",
29 "Number of machine instrs printed");
31 enum AsmWriterFlavorTy { att, intel };
32 cl::opt<AsmWriterFlavorTy>
33 AsmWriterFlavor("x86-asm-syntax",
34 cl::desc("Choose style of code to emit from X86 backend:"),
36 clEnumVal(att, " Emit AT&T-style assembly"),
37 clEnumVal(intel, " Emit Intel-style assembly"),
42 bool X86SharedAsmPrinter::doInitialization(Module& M) {
43 bool leadingUnderscore = false;
45 const std::string& TT = M.getTargetTriple();
46 if (TT.length() > 5) {
47 forCygwin = TT.find("cygwin") != std::string::npos ||
48 TT.find("mingw") != std::string::npos;
49 forDarwin = TT.find("darwin") != std::string::npos;
50 } else if (TT.empty()) {
51 #if defined(__CYGWIN__) || defined(__MINGW32__)
53 #elif defined(__APPLE__)
56 leadingUnderscore = true;
58 leadingUnderscore = false;
61 if (leadingUnderscore || forCygwin || forDarwin)
65 AlignmentIsInBytes = false;
67 return AsmPrinter::doInitialization(M);
70 /// printConstantPool - Print to the current output stream assembly
71 /// representations of the constants in the constant pool MCP. This is
72 /// used to print out constants which have been "spilled to memory" by
73 /// the code generator.
75 void X86SharedAsmPrinter::printConstantPool(MachineConstantPool *MCP) {
76 const std::vector<Constant*> &CP = MCP->getConstants();
77 const TargetData &TD = TM.getTargetData();
79 if (CP.empty()) return;
81 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
85 O << "\t.section .rodata\n";
86 emitAlignment(TD.getTypeAlignmentShift(CP[i]->getType()));
87 O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t" << CommentString
89 emitGlobalConstant(CP[i]);
93 bool X86SharedAsmPrinter::doFinalization(Module &M) {
94 const TargetData &TD = TM.getTargetData();
95 std::string CurSection;
97 // Print out module-level global variables here.
98 for (Module::const_global_iterator I = M.global_begin(),
99 E = M.global_end(); I != E; ++I)
100 if (I->hasInitializer()) { // External global require no code
102 std::string name = Mang->getValueName(I);
103 Constant *C = I->getInitializer();
104 unsigned Size = TD.getTypeSize(C->getType());
105 unsigned Align = TD.getTypeAlignmentShift(C->getType());
107 if (C->isNullValue() &&
108 (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
109 I->hasWeakLinkage() /* FIXME: Verify correct */)) {
110 SwitchSection(O, CurSection, ".data");
111 if (!forCygwin && !forDarwin && I->hasInternalLinkage())
112 O << "\t.local " << name << "\n";
113 if (forDarwin && I->hasInternalLinkage())
114 O << "\t.lcomm " << name << "," << Size << "," << Align;
116 O << "\t.comm " << name << "," << Size;
117 if (!forCygwin && !forDarwin)
118 O << "," << (1 << Align);
120 WriteAsOperand(O, I, true, true, &M);
123 switch (I->getLinkage()) {
124 default: assert(0 && "Unknown linkage type!");
125 case GlobalValue::LinkOnceLinkage:
126 case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
127 // Nonnull linkonce -> weak
128 O << "\t.weak " << name << "\n";
129 SwitchSection(O, CurSection, "");
130 O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
132 case GlobalValue::AppendingLinkage:
133 // FIXME: appending linkage variables should go into a section of
134 // their name or something. For now, just emit them as external.
135 case GlobalValue::ExternalLinkage:
136 // If external or appending, declare as a global symbol
137 O << "\t.globl " << name << "\n";
139 case GlobalValue::InternalLinkage:
140 if (C->isNullValue())
141 SwitchSection(O, CurSection, ".bss");
143 SwitchSection(O, CurSection, ".data");
147 emitAlignment(Align);
148 if (!forCygwin && !forDarwin) {
149 O << "\t.type " << name << ",@object\n";
150 O << "\t.size " << name << "," << Size << "\n";
152 O << name << ":\t\t\t\t# ";
153 WriteAsOperand(O, I, true, true, &M);
155 WriteAsOperand(O, C, false, false, &M);
157 emitGlobalConstant(C);
162 // Output stubs for dynamically-linked functions
164 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
166 O << "\t.symbol_stub\n";
167 O << "L" << *i << "$stub:\n";
168 O << "\t.indirect_symbol " << *i << "\n";
169 O << "\tjmp\t*L" << j << "$lz\n";
170 O << "L" << *i << "$stub_binder:\n";
171 O << "\tpushl\t$L" << j << "$lz\n";
172 O << "\tjmp\tdyld_stub_binding_helper\n";
173 O << "\t.section __DATA, __la_sym_ptr3,lazy_symbol_pointers\n";
174 O << "L" << j << "$lz:\n";
175 O << "\t.indirect_symbol " << *i << "\n";
176 O << "\t.long\tL" << *i << "$stub_binder\n";
181 // Output stubs for external global variables
182 if (GVStubs.begin() != GVStubs.end())
183 O << ".data\n.non_lazy_symbol_pointer\n";
184 for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end();
186 O << "L" << *i << "$non_lazy_ptr:\n";
187 O << "\t.indirect_symbol " << *i << "\n";
191 // Output stubs for link-once variables
192 if (LinkOnceStubs.begin() != LinkOnceStubs.end())
193 O << ".data\n.align 2\n";
194 for (std::set<std::string>::iterator i = LinkOnceStubs.begin(),
195 e = LinkOnceStubs.end(); i != e; ++i) {
196 O << "L" << *i << "$non_lazy_ptr:\n"
197 << "\t.long\t" << *i << '\n';
201 AsmPrinter::doFinalization(M);
202 return false; // success
205 /// createX86CodePrinterPass - Returns a pass that prints the X86 assembly code
206 /// for a MachineFunction to the given output stream, using the given target
207 /// machine description.
209 FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,TargetMachine &tm){
210 switch (AsmWriterFlavor) {
212 assert(0 && "Unknown asm flavor!");
214 return new X86IntelAsmPrinter(o, tm);
216 return new X86ATTAsmPrinter(o, tm);