1 //===-- AlphaAsmPrinter.cpp - Alpha LLVM assembly writer ------------------===//
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 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(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??");
79 O << TM.getRegisterInfo()->get(MO.getReg()).Name;
80 } else if (MO.isImmediate()) {
81 O << MO.getImmedValue();
82 assert(MO.getImmedValue() < (1 << 30));
89 void AlphaAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) {
90 const MRegisterInfo &RI = *TM.getRegisterInfo();
92 switch (MO.getType()) {
93 case MachineOperand::MO_Register:
94 O << RI.get(MO.getReg()).Name;
97 case MachineOperand::MO_Immediate:
98 cerr << "printOp() does not handle immediate values\n";
102 case MachineOperand::MO_MachineBasicBlock:
103 printBasicBlockLabel(MO.getMachineBasicBlock());
106 case MachineOperand::MO_ConstantPoolIndex:
107 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
108 << MO.getConstantPoolIndex();
111 case MachineOperand::MO_ExternalSymbol:
112 O << MO.getSymbolName();
115 case MachineOperand::MO_GlobalAddress:
116 O << Mang->getValueName(MO.getGlobal());
119 case MachineOperand::MO_JumpTableIndex:
120 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
121 << '_' << MO.getJumpTableIndex();
125 O << "<unknown operand type: " << MO.getType() << ">";
130 /// runOnMachineFunction - This uses the printMachineInstruction()
131 /// method to print assembly for each instruction.
133 bool AlphaAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
134 SetupMachineFunction(MF);
137 // Print out constants referenced by the function
138 EmitConstantPool(MF.getConstantPool());
140 // Print out jump tables referenced by the function
141 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
143 // Print out labels for the function.
144 const Function *F = MF.getFunction();
145 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
148 switch (F->getLinkage()) {
149 default: assert(0 && "Unknown linkage type!");
150 case Function::InternalLinkage: // Symbols default to internal.
152 case Function::ExternalLinkage:
153 O << "\t.globl " << CurrentFnName << "\n";
155 case Function::WeakLinkage:
156 case Function::LinkOnceLinkage:
157 O << TAI->getWeakRefDirective() << CurrentFnName << "\n";
161 O << "\t.ent " << CurrentFnName << "\n";
163 O << CurrentFnName << ":\n";
165 // Print out code for the function.
166 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
168 if (I != MF.begin()) {
169 printBasicBlockLabel(I, true);
172 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
174 // Print the assembly for the instruction.
177 if (!printInstruction(II)) {
178 assert(0 && "Unhandled instruction in asm writer!");
184 O << "\t.end " << CurrentFnName << "\n";
186 // We didn't modify anything.
190 bool AlphaAsmPrinter::doInitialization(Module &M)
192 AsmPrinter::doInitialization(M);
193 if(TM.getSubtarget<AlphaSubtarget>().hasCT())
194 O << "\t.arch ev6\n"; //This might need to be ev67, so leave this test here
196 O << "\t.arch ev6\n";
197 O << "\t.set noat\n";
201 bool AlphaAsmPrinter::doFinalization(Module &M) {
202 const TargetData *TD = TM.getTargetData();
204 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
205 if (I->hasInitializer()) { // External global require no code
206 // Check to see if this is a special global used by LLVM, if so, emit it.
207 if (EmitSpecialLLVMGlobal(I))
211 std::string name = Mang->getValueName(I);
212 Constant *C = I->getInitializer();
213 unsigned Size = TD->getTypeSize(C->getType());
214 // unsigned Align = TD->getPreferredTypeAlignmentShift(C->getType());
215 unsigned Align = TD->getPreferredAlignmentLog(I);
217 if (C->isNullValue() &&
218 (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
219 I->hasWeakLinkage() /* FIXME: Verify correct */)) {
220 SwitchToDataSection("\t.section .data", I);
221 if (I->hasInternalLinkage())
222 O << "\t.local " << name << "\n";
224 O << "\t.comm " << name << "," << TD->getTypeSize(C->getType())
225 << "," << (1 << Align)
228 switch (I->getLinkage()) {
229 case GlobalValue::LinkOnceLinkage:
230 case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
231 // Nonnull linkonce -> weak
232 O << "\t.weak " << name << "\n";
233 O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
234 SwitchToDataSection("", I);
236 case GlobalValue::AppendingLinkage:
237 // FIXME: appending linkage variables should go into a section of
238 // their name or something. For now, just emit them as external.
239 case GlobalValue::ExternalLinkage:
240 // If external or appending, declare as a global symbol
241 O << "\t.globl " << name << "\n";
243 case GlobalValue::InternalLinkage:
244 SwitchToDataSection(C->isNullValue() ? "\t.section .bss" :
245 "\t.section .data", I);
247 case GlobalValue::GhostLinkage:
248 cerr << "GhostLinkage cannot appear in AlphaAsmPrinter!\n";
250 case GlobalValue::DLLImportLinkage:
251 cerr << "DLLImport linkage is not supported by this target!\n";
253 case GlobalValue::DLLExportLinkage:
254 cerr << "DLLExport linkage is not supported by this target!\n";
257 assert(0 && "Unknown linkage type!");
260 EmitAlignment(Align);
261 O << "\t.type " << name << ",@object\n";
262 O << "\t.size " << name << "," << Size << "\n";
264 EmitGlobalConstant(C);
268 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I)
269 if (I->hasExternalWeakLinkage()) {
271 std::string name = Mang->getValueName(I);
272 O << "\t.weak " << name << "\n";
275 AsmPrinter::doFinalization(M);
279 /// PrintAsmOperand - Print out an operand for an inline asm expression.
281 bool AlphaAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
283 const char *ExtraCode) {
284 printOperand(MI, OpNo);
288 bool AlphaAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
291 const char *ExtraCode) {
292 if (ExtraCode && ExtraCode[0])
293 return true; // Unknown modifier.
295 printOperand(MI, OpNo);