1 //===-- XCoreAsmPrinter.cpp - XCore 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 the XAS-format XCore assembly language.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "asm-printer"
17 #include "XCoreInstrInfo.h"
18 #include "XCoreSubtarget.h"
19 #include "XCoreTargetMachine.h"
20 #include "llvm/Constants.h"
21 #include "llvm/DerivedTypes.h"
22 #include "llvm/Module.h"
23 #include "llvm/CodeGen/AsmPrinter.h"
24 #include "llvm/CodeGen/DwarfWriter.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/CodeGen/MachineFunctionPass.h"
27 #include "llvm/CodeGen/MachineConstantPool.h"
28 #include "llvm/CodeGen/MachineInstr.h"
29 #include "llvm/Target/TargetAsmInfo.h"
30 #include "llvm/Target/TargetData.h"
31 #include "llvm/Support/Mangler.h"
32 #include "llvm/ADT/Statistic.h"
33 #include "llvm/ADT/StringExtras.h"
34 #include "llvm/Support/CommandLine.h"
35 #include "llvm/Support/MathExtras.h"
36 #include "llvm/Support/raw_ostream.h"
41 STATISTIC(EmittedInsts, "Number of machine instrs printed");
43 static cl::opt<std::string> FileDirective("xcore-file-directive", cl::Optional,
44 cl::desc("Output a file directive into the assembly file"),
46 cl::value_desc("filename"),
49 static cl::opt<unsigned> MaxThreads("xcore-max-threads", cl::Optional,
50 cl::desc("Maximum number of threads (for emulation thread-local storage)"),
52 cl::value_desc("number"),
56 class VISIBILITY_HIDDEN XCoreAsmPrinter : public AsmPrinter {
58 const XCoreSubtarget &Subtarget;
60 explicit XCoreAsmPrinter(raw_ostream &O, XCoreTargetMachine &TM,
61 const TargetAsmInfo *T, CodeGenOpt::Level OL,
63 : AsmPrinter(O, TM, T, OL, V), DW(0),
64 Subtarget(*TM.getSubtargetImpl()) {}
66 virtual const char *getPassName() const {
67 return "XCore Assembly Printer";
70 void printMemOperand(const MachineInstr *MI, int opNum);
71 void printOperand(const MachineInstr *MI, int opNum);
72 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
73 unsigned AsmVariant, const char *ExtraCode);
75 void emitFileDirective(const std::string &filename);
76 void emitGlobalDirective(const std::string &name);
77 void emitExternDirective(const std::string &name);
79 void emitArrayBound(const std::string &name, const GlobalVariable *GV);
80 void emitGlobal(const GlobalVariable *GV);
82 void emitFunctionStart(MachineFunction &MF);
83 void emitFunctionEnd(MachineFunction &MF);
85 bool printInstruction(const MachineInstr *MI); // autogenerated.
86 void printMachineInstruction(const MachineInstr *MI);
87 bool runOnMachineFunction(MachineFunction &F);
88 bool doInitialization(Module &M);
89 bool doFinalization(Module &M);
91 void getAnalysisUsage(AnalysisUsage &AU) const {
92 AsmPrinter::getAnalysisUsage(AU);
94 AU.addRequired<MachineModuleInfo>();
95 AU.addRequired<DwarfWriter>();
98 } // end of anonymous namespace
100 #include "XCoreGenAsmWriter.inc"
102 /// createXCoreCodePrinterPass - Returns a pass that prints the XCore
103 /// assembly code for a MachineFunction to the given output stream,
104 /// using the given target machine description. This should work
105 /// regardless of whether the function is in SSA form.
107 FunctionPass *llvm::createXCoreCodePrinterPass(raw_ostream &o,
108 XCoreTargetMachine &tm,
109 CodeGenOpt::Level OptLevel,
111 return new XCoreAsmPrinter(o, tm, tm.getTargetAsmInfo(), OptLevel, verbose);
114 // PrintEscapedString - Print each character of the specified string, escaping
115 // it if it is not printable or if it is an escape char.
116 static void PrintEscapedString(const std::string &Str, raw_ostream &Out) {
117 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
118 unsigned char C = Str[i];
119 if (isprint(C) && C != '"' && C != '\\') {
123 << (char) ((C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'))
124 << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
129 void XCoreAsmPrinter::
130 emitFileDirective(const std::string &name)
133 PrintEscapedString(name, O);
137 void XCoreAsmPrinter::
138 emitGlobalDirective(const std::string &name)
140 O << TAI->getGlobalDirective() << name;
144 void XCoreAsmPrinter::
145 emitExternDirective(const std::string &name)
147 O << "\t.extern\t" << name;
151 void XCoreAsmPrinter::
152 emitArrayBound(const std::string &name, const GlobalVariable *GV)
154 assert(((GV->hasExternalLinkage() ||
155 GV->hasWeakLinkage()) ||
156 GV->hasLinkOnceLinkage()) && "Unexpected linkage");
157 if (const ArrayType *ATy = dyn_cast<ArrayType>(
158 cast<PointerType>(GV->getType())->getElementType()))
160 O << TAI->getGlobalDirective() << name << ".globound" << "\n";
161 O << TAI->getSetDirective() << name << ".globound" << ","
162 << ATy->getNumElements() << "\n";
163 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
164 // TODO Use COMDAT groups for LinkOnceLinkage
165 O << TAI->getWeakDefDirective() << name << ".globound" << "\n";
170 void XCoreAsmPrinter::
171 emitGlobal(const GlobalVariable *GV)
173 const TargetData *TD = TM.getTargetData();
175 if (GV->hasInitializer()) {
176 // Check to see if this is a special global used by LLVM, if so, emit it.
177 if (EmitSpecialLLVMGlobal(GV))
180 SwitchToSection(TAI->SectionForGlobal(GV));
182 std::string name = Mang->getValueName(GV);
183 Constant *C = GV->getInitializer();
184 unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
186 // Mark the start of the global
187 O << "\t.cc_top " << name << ".data," << name << "\n";
189 switch (GV->getLinkage()) {
190 case GlobalValue::AppendingLinkage:
191 cerr << "AppendingLinkage is not supported by this target!\n";
193 case GlobalValue::LinkOnceAnyLinkage:
194 case GlobalValue::LinkOnceODRLinkage:
195 case GlobalValue::WeakAnyLinkage:
196 case GlobalValue::WeakODRLinkage:
197 case GlobalValue::ExternalLinkage:
198 emitArrayBound(name, GV);
199 emitGlobalDirective(name);
200 // TODO Use COMDAT groups for LinkOnceLinkage
201 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
202 O << TAI->getWeakDefDirective() << name << "\n";
205 case GlobalValue::InternalLinkage:
206 case GlobalValue::PrivateLinkage:
208 case GlobalValue::GhostLinkage:
209 cerr << "Should not have any unmaterialized functions!\n";
211 case GlobalValue::DLLImportLinkage:
212 cerr << "DLLImport linkage is not supported by this target!\n";
214 case GlobalValue::DLLExportLinkage:
215 cerr << "DLLExport linkage is not supported by this target!\n";
218 assert(0 && "Unknown linkage type!");
221 EmitAlignment(Align, GV, 2);
223 unsigned Size = TD->getTypeAllocSize(C->getType());
224 if (GV->isThreadLocal()) {
227 if (TAI->hasDotTypeDotSizeDirective()) {
228 O << "\t.type " << name << ",@object\n";
229 O << "\t.size " << name << "," << Size << "\n";
233 EmitGlobalConstant(C);
234 if (GV->isThreadLocal()) {
235 for (unsigned i = 1; i < MaxThreads; ++i) {
236 EmitGlobalConstant(C);
240 // The ABI requires that unsigned scalar types smaller than 32 bits
241 // are are padded to 32 bits.
245 // Mark the end of the global
246 O << "\t.cc_bottom " << name << ".data\n";
250 /// Emit the directives on the start of functions
251 void XCoreAsmPrinter::
252 emitFunctionStart(MachineFunction &MF)
254 // Print out the label for the function.
255 const Function *F = MF.getFunction();
257 SwitchToSection(TAI->SectionForGlobal(F));
259 // Mark the start of the function
260 O << "\t.cc_top " << CurrentFnName << ".function," << CurrentFnName << "\n";
262 switch (F->getLinkage()) {
263 default: assert(0 && "Unknown linkage type!");
264 case Function::InternalLinkage: // Symbols default to internal.
265 case Function::PrivateLinkage:
267 case Function::ExternalLinkage:
268 emitGlobalDirective(CurrentFnName);
270 case Function::LinkOnceAnyLinkage:
271 case Function::LinkOnceODRLinkage:
272 case Function::WeakAnyLinkage:
273 case Function::WeakODRLinkage:
274 // TODO Use COMDAT groups for LinkOnceLinkage
275 O << TAI->getGlobalDirective() << CurrentFnName << "\n";
276 O << TAI->getWeakDefDirective() << CurrentFnName << "\n";
279 // (1 << 1) byte aligned
280 EmitAlignment(MF.getAlignment(), F, 1);
281 if (TAI->hasDotTypeDotSizeDirective()) {
282 O << "\t.type " << CurrentFnName << ",@function\n";
284 O << CurrentFnName << ":\n";
287 /// Emit the directives on the end of functions
288 void XCoreAsmPrinter::
289 emitFunctionEnd(MachineFunction &MF)
291 // Mark the end of the function
292 O << "\t.cc_bottom " << CurrentFnName << ".function\n";
295 /// runOnMachineFunction - This uses the printMachineInstruction()
296 /// method to print assembly for each instruction.
298 bool XCoreAsmPrinter::runOnMachineFunction(MachineFunction &MF)
302 SetupMachineFunction(MF);
304 // Print out constants referenced by the function
305 EmitConstantPool(MF.getConstantPool());
307 // Print out jump tables referenced by the function
308 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
310 // Emit the function start directives
311 emitFunctionStart(MF);
313 // Emit pre-function debug information.
314 DW->BeginFunction(&MF);
316 // Print out code for the function.
317 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
320 // Print a label for the basic block.
321 if (I != MF.begin()) {
322 printBasicBlockLabel(I, true , true);
326 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
328 // Print the assembly for the instruction.
330 printMachineInstruction(II);
333 // Each Basic Block is separated by a newline
337 // Emit function end directives
340 // Emit post-function debug information.
341 DW->EndFunction(&MF);
343 // We didn't modify anything.
347 void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum)
349 printOperand(MI, opNum);
351 if (MI->getOperand(opNum+1).isImm()
352 && MI->getOperand(opNum+1).getImm() == 0)
356 printOperand(MI, opNum+1);
359 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
360 const MachineOperand &MO = MI->getOperand(opNum);
361 switch (MO.getType()) {
362 case MachineOperand::MO_Register:
363 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
364 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
366 assert(0 && "not implemented");
368 case MachineOperand::MO_Immediate:
371 case MachineOperand::MO_MachineBasicBlock:
372 printBasicBlockLabel(MO.getMBB());
374 case MachineOperand::MO_GlobalAddress:
375 O << Mang->getValueName(MO.getGlobal());
377 case MachineOperand::MO_ExternalSymbol:
378 O << MO.getSymbolName();
380 case MachineOperand::MO_ConstantPoolIndex:
381 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
382 << '_' << MO.getIndex();
384 case MachineOperand::MO_JumpTableIndex:
385 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
386 << '_' << MO.getIndex();
389 assert(0 && "not implemented");
393 /// PrintAsmOperand - Print out an operand for an inline asm expression.
395 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
397 const char *ExtraCode) {
398 printOperand(MI, OpNo);
402 void XCoreAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
405 // Check for mov mnemonic
406 unsigned src, dst, srcSR, dstSR;
407 if (TM.getInstrInfo()->isMoveInstr(*MI, src, dst, srcSR, dstSR)) {
409 O << TM.getRegisterInfo()->get(dst).AsmName;
411 O << TM.getRegisterInfo()->get(src).AsmName;
415 if (printInstruction(MI)) {
418 assert(0 && "Unhandled instruction in asm writer!");
421 bool XCoreAsmPrinter::doInitialization(Module &M) {
422 bool Result = AsmPrinter::doInitialization(M);
423 DW = getAnalysisIfAvailable<DwarfWriter>();
425 if (!FileDirective.empty())
426 emitFileDirective(FileDirective);
431 bool XCoreAsmPrinter::doFinalization(Module &M) {
433 // Print out module-level global variables.
434 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
439 return AsmPrinter::doFinalization(M);