1 //===-- AlphaAsmPrinter.cpp - Alpha LLVM assembly writer ------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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 GAS-format Alpha assembly language.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "asm-printer"
17 #include "AlphaInstrInfo.h"
18 #include "AlphaTargetMachine.h"
19 #include "llvm/Module.h"
20 #include "llvm/Type.h"
21 #include "llvm/Assembly/Writer.h"
22 #include "llvm/CodeGen/AsmPrinter.h"
23 #include "llvm/Target/TargetAsmInfo.h"
24 #include "llvm/Target/TargetMachine.h"
25 #include "llvm/Support/Compiler.h"
26 #include "llvm/Support/Mangler.h"
27 #include "llvm/ADT/Statistic.h"
30 STATISTIC(EmittedInsts, "Number of machine instrs printed");
33 struct VISIBILITY_HIDDEN AlphaAsmPrinter : public AsmPrinter {
35 /// Unique incrementer for label values for referencing Global values.
38 AlphaAsmPrinter(std::ostream &o, TargetMachine &tm, const TargetAsmInfo *T)
39 : AsmPrinter(o, tm, T) {
42 virtual const char *getPassName() const {
43 return "Alpha Assembly Printer";
45 bool printInstruction(const MachineInstr *MI);
46 void printOp(const MachineOperand &MO, bool IsCallOp = false);
47 void printOperand(const MachineInstr *MI, int opNum);
48 void printBaseOffsetPair (const MachineInstr *MI, int i, bool brackets=true);
49 bool runOnMachineFunction(MachineFunction &F);
50 bool doInitialization(Module &M);
51 bool doFinalization(Module &M);
53 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
54 unsigned AsmVariant, const char *ExtraCode);
55 bool PrintAsmMemoryOperand(const MachineInstr *MI,
58 const char *ExtraCode);
60 } // end of anonymous namespace
62 /// createAlphaCodePrinterPass - Returns a pass that prints the Alpha
63 /// assembly code for a MachineFunction to the given output stream,
64 /// using the given target machine description. This should work
65 /// regardless of whether the function is in SSA form.
67 FunctionPass *llvm::createAlphaCodePrinterPass(std::ostream &o,
69 return new AlphaAsmPrinter(o, tm, tm.getTargetAsmInfo());
72 #include "AlphaGenAsmWriter.inc"
74 void AlphaAsmPrinter::printOperand(const MachineInstr *MI, int opNum)
76 const MachineOperand &MO = MI->getOperand(opNum);
77 if (MO.getType() == MachineOperand::MO_Register) {
78 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
80 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
81 } else if (MO.isImmediate()) {
83 assert(MO.getImm() < (1 << 30));
90 void AlphaAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) {
91 const TargetRegisterInfo &RI = *TM.getRegisterInfo();
93 switch (MO.getType()) {
94 case MachineOperand::MO_Register:
95 O << RI.get(MO.getReg()).AsmName;
98 case MachineOperand::MO_Immediate:
99 cerr << "printOp() does not handle immediate values\n";
103 case MachineOperand::MO_MachineBasicBlock:
104 printBasicBlockLabel(MO.getMBB());
107 case MachineOperand::MO_ConstantPoolIndex:
108 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
112 case MachineOperand::MO_ExternalSymbol:
113 O << MO.getSymbolName();
116 case MachineOperand::MO_GlobalAddress: {
117 GlobalValue *GV = MO.getGlobal();
118 O << Mang->getValueName(GV);
119 if (GV->isDeclaration() && GV->hasExternalWeakLinkage())
120 ExtWeakSymbols.insert(GV);
124 case MachineOperand::MO_JumpTableIndex:
125 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
126 << '_' << MO.getIndex();
130 O << "<unknown operand type: " << MO.getType() << ">";
135 /// runOnMachineFunction - This uses the printMachineInstruction()
136 /// method to print assembly for each instruction.
138 bool AlphaAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
139 SetupMachineFunction(MF);
142 // Print out constants referenced by the function
143 EmitConstantPool(MF.getConstantPool());
145 // Print out jump tables referenced by the function
146 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
148 // Print out labels for the function.
149 const Function *F = MF.getFunction();
150 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
153 switch (F->getLinkage()) {
154 default: assert(0 && "Unknown linkage type!");
155 case Function::InternalLinkage: // Symbols default to internal.
157 case Function::ExternalLinkage:
158 O << "\t.globl " << CurrentFnName << "\n";
160 case Function::WeakLinkage:
161 case Function::LinkOnceLinkage:
162 O << TAI->getWeakRefDirective() << CurrentFnName << "\n";
166 O << "\t.ent " << CurrentFnName << "\n";
168 O << CurrentFnName << ":\n";
170 // Print out code for the function.
171 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
173 if (I != MF.begin()) {
174 printBasicBlockLabel(I, true, true);
177 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
179 // Print the assembly for the instruction.
181 if (!printInstruction(II)) {
182 assert(0 && "Unhandled instruction in asm writer!");
188 O << "\t.end " << CurrentFnName << "\n";
190 // We didn't modify anything.
194 bool AlphaAsmPrinter::doInitialization(Module &M)
196 if(TM.getSubtarget<AlphaSubtarget>().hasCT())
197 O << "\t.arch ev6\n"; //This might need to be ev67, so leave this test here
199 O << "\t.arch ev6\n";
200 O << "\t.set noat\n";
201 return AsmPrinter::doInitialization(M);
204 bool AlphaAsmPrinter::doFinalization(Module &M) {
205 const TargetData *TD = TM.getTargetData();
207 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) {
209 if (!I->hasInitializer()) continue; // External global require no code
211 // Check to see if this is a special global used by LLVM, if so, emit it.
212 if (EmitSpecialLLVMGlobal(I))
215 std::string name = Mang->getValueName(I);
216 Constant *C = I->getInitializer();
217 unsigned Size = TD->getABITypeSize(C->getType());
218 unsigned Align = TD->getPreferredAlignmentLog(I);
221 if (I->hasHiddenVisibility())
222 O << TAI->getHiddenDirective() << name << "\n";
225 switch (I->getLinkage()) {
226 case GlobalValue::LinkOnceLinkage:
227 case GlobalValue::WeakLinkage:
228 case GlobalValue::CommonLinkage:
229 O << TAI->getWeakRefDirective() << name << '\n';
231 case GlobalValue::AppendingLinkage:
232 case GlobalValue::ExternalLinkage:
233 O << "\t.globl " << name << "\n";
235 case GlobalValue::InternalLinkage:
238 assert(0 && "Unknown linkage type!");
239 cerr << "Unknown linkage type!\n";
243 //3: Section (if changed)
244 if (I->hasSection() &&
245 (I->getSection() == ".ctors" ||
246 I->getSection() == ".dtors")) {
247 std::string SectionName = ".section\t" + I->getSection()
248 + ",\"aw\",@progbits";
249 SwitchToDataSection(SectionName.c_str());
251 if (C->isNullValue())
252 SwitchToDataSection("\t.section\t.bss", I);
254 SwitchToDataSection("\t.section\t.data", I);
257 //4: Type, Size, Align
258 O << "\t.type\t" << name << ", @object\n";
259 O << "\t.size\t" << name << ", " << Size << "\n";
260 EmitAlignment(Align, I);
264 // If the initializer is a extern weak symbol, remember to emit the weak
266 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
267 if (GV->hasExternalWeakLinkage())
268 ExtWeakSymbols.insert(GV);
270 EmitGlobalConstant(C);
274 return AsmPrinter::doFinalization(M);
277 /// PrintAsmOperand - Print out an operand for an inline asm expression.
279 bool AlphaAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
281 const char *ExtraCode) {
282 printOperand(MI, OpNo);
286 bool AlphaAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
289 const char *ExtraCode) {
290 if (ExtraCode && ExtraCode[0])
291 return true; // Unknown modifier.
293 printOperand(MI, OpNo);