1 //===-- X86ATTAsmPrinter.cpp - Convert X86 LLVM code to Intel 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 contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to AT&T format assembly
12 // language. This printer is the output mechanism used by `llc'.
14 //===----------------------------------------------------------------------===//
16 #include "X86ATTAsmPrinter.h"
18 #include "X86TargetMachine.h"
19 #include "llvm/Module.h"
20 #include "llvm/Support/Mangler.h"
24 /// runOnMachineFunction - This uses the printMachineInstruction()
25 /// method to print assembly for each instruction.
27 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
28 SetupMachineFunction(MF);
31 // Print out constants referenced by the function
32 EmitConstantPool(MF.getConstantPool());
34 // Print out labels for the function.
35 SwitchSection("\t.text\n", MF.getFunction());
36 EmitAlignment(4); // FIXME: This should be parameterized somewhere.
37 O << "\t.globl\t" << CurrentFnName << "\n";
38 if (HasDotTypeDotSizeDirective)
39 O << "\t.type\t" << CurrentFnName << ", @function\n";
40 O << CurrentFnName << ":\n";
42 // Print out code for the function.
43 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
45 // Print a label for the basic block.
46 if (I->pred_begin() != I->pred_end())
47 O << PrivateGlobalPrefix << "BB" << CurrentFnName << "_" << I->getNumber()
48 << ":\t" << CommentString << " " << I->getBasicBlock()->getName()
50 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
52 // Print the assembly for the instruction.
54 printMachineInstruction(II);
57 if (HasDotTypeDotSizeDirective)
58 O << "\t.size " << CurrentFnName << ", .-" << CurrentFnName << "\n";
60 // We didn't modify anything.
64 void X86ATTAsmPrinter::printOp(const MachineOperand &MO, bool isCallOp) {
65 const MRegisterInfo &RI = *TM.getRegisterInfo();
66 switch (MO.getType()) {
67 case MachineOperand::MO_VirtualRegister:
68 case MachineOperand::MO_MachineRegister:
69 assert(MRegisterInfo::isPhysicalRegister(MO.getReg()) &&
70 "Virtual registers should not make it this far!");
72 for (const char *Name = RI.get(MO.getReg()).Name; *Name; ++Name)
73 O << (char)tolower(*Name);
76 case MachineOperand::MO_SignExtendedImmed:
77 case MachineOperand::MO_UnextendedImmed:
78 O << '$' << (int)MO.getImmedValue();
80 case MachineOperand::MO_MachineBasicBlock: {
81 MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
82 O << PrivateGlobalPrefix << "BB"
83 << Mang->getValueName(MBBOp->getParent()->getFunction())
84 << "_" << MBBOp->getNumber () << "\t# "
85 << MBBOp->getBasicBlock ()->getName ();
88 case MachineOperand::MO_PCRelativeDisp:
89 std::cerr << "Shouldn't use addPCDisp() when building X86 MachineInstrs";
92 case MachineOperand::MO_GlobalAddress: {
93 // Darwin block shameless ripped from PowerPCAsmPrinter.cpp
95 if (!isCallOp) O << '$';
96 GlobalValue *GV = MO.getGlobal();
97 std::string Name = Mang->getValueName(GV);
99 // Dynamically-resolved functions need a stub for the function. Be
100 // wary however not to output $stub for external functions whose addresses
101 // are taken. Those should be emitted as $non_lazy_ptr below.
102 Function *F = dyn_cast<Function>(GV);
103 if (F && isCallOp && F->isExternal()) {
104 FnStubs.insert(Name);
105 O << "L" << Name << "$stub";
106 } else if (GV->hasLinkOnceLinkage()) {
107 // Link-once, External, or Weakly-linked global variables need
108 // non-lazily-resolved stubs
109 LinkOnceStubs.insert(Name);
110 O << "L" << Name << "$non_lazy_ptr";
111 } else if (GV->isExternal() || GV->hasWeakLinkage()) {
112 GVStubs.insert(Name);
113 O << "L" << Name << "$non_lazy_ptr";
115 O << Mang->getValueName(GV);
117 int Offset = MO.getOffset();
124 if (!isCallOp) O << '$';
125 O << Mang->getValueName(MO.getGlobal());
126 int Offset = MO.getOffset();
133 case MachineOperand::MO_ExternalSymbol:
134 if (isCallOp && forDarwin) {
135 std::string Name(GlobalPrefix); Name += MO.getSymbolName();
136 FnStubs.insert(Name);
137 O << "L" << Name << "$stub";
140 if (!isCallOp) O << '$';
141 O << GlobalPrefix << MO.getSymbolName();
144 O << "<unknown operand type>"; return;
148 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op,
150 unsigned char value = MI->getOperand(Op).getImmedValue();
151 assert(value <= 7 && "Invalid ssecc argument!");
153 case 0: O << "eq"; break;
154 case 1: O << "lt"; break;
155 case 2: O << "le"; break;
156 case 3: O << "unord"; break;
157 case 4: O << "neq"; break;
158 case 5: O << "nlt"; break;
159 case 6: O << "nle"; break;
160 case 7: O << "ord"; break;
164 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op){
165 assert(isMem(MI, Op) && "Invalid memory reference!");
167 const MachineOperand &BaseReg = MI->getOperand(Op);
168 int ScaleVal = MI->getOperand(Op+1).getImmedValue();
169 const MachineOperand &IndexReg = MI->getOperand(Op+2);
170 const MachineOperand &DispSpec = MI->getOperand(Op+3);
172 if (BaseReg.isFrameIndex()) {
173 O << "[frame slot #" << BaseReg.getFrameIndex();
174 if (DispSpec.getImmedValue())
175 O << " + " << DispSpec.getImmedValue();
178 } else if (BaseReg.isConstantPoolIndex()) {
179 O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << "_"
180 << BaseReg.getConstantPoolIndex();
181 if (DispSpec.getImmedValue())
182 O << "+" << DispSpec.getImmedValue();
183 if (IndexReg.getReg()) {
187 O << "," << ScaleVal;
193 if (DispSpec.isGlobalAddress()) {
194 printOp(DispSpec, true);
196 int DispVal = DispSpec.getImmedValue();
197 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
201 if (IndexReg.getReg() || BaseReg.getReg()) {
203 if (BaseReg.getReg())
206 if (IndexReg.getReg()) {
210 O << "," << ScaleVal;
217 /// printMachineInstruction -- Print out a single X86 LLVM instruction
218 /// MI in Intel syntax to the current output stream.
220 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
222 // Call the autogenerated instruction printer routines.
223 printInstruction(MI);
226 // Include the auto-generated portion of the assembly writer.
227 #include "X86GenAsmWriter.inc"