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 struct VISIBILITY_HIDDEN XCoreAsmPrinter : public AsmPrinter {
57 XCoreAsmPrinter(raw_ostream &O, XCoreTargetMachine &TM,
58 const TargetAsmInfo *T)
59 : AsmPrinter(O, TM, T), DW(0),
60 Subtarget(*TM.getSubtargetImpl()) { }
63 const XCoreSubtarget &Subtarget;
65 virtual const char *getPassName() const {
66 return "XCore Assembly Printer";
69 void printMemOperand(const MachineInstr *MI, int opNum);
70 void printOperand(const MachineInstr *MI, int opNum);
71 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
72 unsigned AsmVariant, const char *ExtraCode);
74 void emitFileDirective(const std::string &filename);
75 void emitGlobalDirective(const std::string &name);
76 void emitExternDirective(const std::string &name);
78 void emitArrayBound(const std::string &name, const GlobalVariable *GV);
79 void emitGlobal(const GlobalVariable *GV);
81 void emitFunctionStart(MachineFunction &MF);
82 void emitFunctionEnd(MachineFunction &MF);
84 bool printInstruction(const MachineInstr *MI); // autogenerated.
85 void printMachineInstruction(const MachineInstr *MI);
86 bool runOnMachineFunction(MachineFunction &F);
87 bool doInitialization(Module &M);
88 bool doFinalization(Module &M);
90 void getAnalysisUsage(AnalysisUsage &AU) const {
91 AsmPrinter::getAnalysisUsage(AU);
93 AU.addRequired<MachineModuleInfo>();
94 AU.addRequired<DwarfWriter>();
97 } // end of anonymous namespace
99 #include "XCoreGenAsmWriter.inc"
101 /// createXCoreCodePrinterPass - Returns a pass that prints the XCore
102 /// assembly code for a MachineFunction to the given output stream,
103 /// using the given target machine description. This should work
104 /// regardless of whether the function is in SSA form.
106 FunctionPass *llvm::createXCoreCodePrinterPass(raw_ostream &o,
107 XCoreTargetMachine &tm) {
108 return new XCoreAsmPrinter(o, tm, tm.getTargetAsmInfo());
111 // PrintEscapedString - Print each character of the specified string, escaping
112 // it if it is not printable or if it is an escape char.
113 static void PrintEscapedString(const std::string &Str, raw_ostream &Out) {
114 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
115 unsigned char C = Str[i];
116 if (isprint(C) && C != '"' && C != '\\') {
120 << (char) ((C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'))
121 << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
126 void XCoreAsmPrinter::
127 emitFileDirective(const std::string &name)
130 PrintEscapedString(name, O);
134 void XCoreAsmPrinter::
135 emitGlobalDirective(const std::string &name)
137 O << TAI->getGlobalDirective() << name;
141 void XCoreAsmPrinter::
142 emitExternDirective(const std::string &name)
144 O << "\t.extern\t" << name;
148 void XCoreAsmPrinter::
149 emitArrayBound(const std::string &name, const GlobalVariable *GV)
151 assert(((GV->hasExternalLinkage() ||
152 GV->hasWeakLinkage()) ||
153 GV->hasLinkOnceLinkage()) && "Unexpected linkage");
154 if (const ArrayType *ATy = dyn_cast<ArrayType>(
155 cast<PointerType>(GV->getType())->getElementType()))
157 O << TAI->getGlobalDirective() << name << ".globound" << "\n";
158 O << TAI->getSetDirective() << name << ".globound" << ","
159 << ATy->getNumElements() << "\n";
160 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
161 // TODO Use COMDAT groups for LinkOnceLinkage
162 O << TAI->getWeakDefDirective() << name << ".globound" << "\n";
167 void XCoreAsmPrinter::
168 emitGlobal(const GlobalVariable *GV)
170 const TargetData *TD = TM.getTargetData();
172 if (GV->hasInitializer()) {
173 // Check to see if this is a special global used by LLVM, if so, emit it.
174 if (EmitSpecialLLVMGlobal(GV))
177 SwitchToSection(TAI->SectionForGlobal(GV));
179 std::string name = Mang->getValueName(GV);
180 Constant *C = GV->getInitializer();
181 unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
183 // Mark the start of the global
184 O << "\t.cc_top " << name << ".data," << name << "\n";
186 switch (GV->getLinkage()) {
187 case GlobalValue::AppendingLinkage:
188 cerr << "AppendingLinkage is not supported by this target!\n";
190 case GlobalValue::LinkOnceLinkage:
191 case GlobalValue::WeakLinkage:
192 case GlobalValue::ExternalLinkage:
193 emitArrayBound(name, GV);
194 emitGlobalDirective(name);
195 // TODO Use COMDAT groups for LinkOnceLinkage
196 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
197 O << TAI->getWeakDefDirective() << name << "\n";
200 case GlobalValue::InternalLinkage:
202 case GlobalValue::GhostLinkage:
203 cerr << "Should not have any unmaterialized functions!\n";
205 case GlobalValue::DLLImportLinkage:
206 cerr << "DLLImport linkage is not supported by this target!\n";
208 case GlobalValue::DLLExportLinkage:
209 cerr << "DLLExport linkage is not supported by this target!\n";
212 assert(0 && "Unknown linkage type!");
215 EmitAlignment(Align, GV, 2);
217 unsigned Size = TD->getABITypeSize(C->getType());
218 if (GV->isThreadLocal()) {
221 if (TAI->hasDotTypeDotSizeDirective()) {
222 O << "\t.type " << name << ",@object\n";
223 O << "\t.size " << name << "," << Size << "\n";
227 EmitGlobalConstant(C);
228 if (GV->isThreadLocal()) {
229 for (unsigned i = 1; i < MaxThreads; ++i) {
230 EmitGlobalConstant(C);
234 // The ABI requires that unsigned scalar types smaller than 32 bits
235 // are are padded to 32 bits.
239 // Mark the end of the global
240 O << "\t.cc_bottom " << name << ".data\n";
242 if (GV->hasExternalWeakLinkage())
243 ExtWeakSymbols.insert(GV);
247 /// Emit the directives on the start of functions
248 void XCoreAsmPrinter::
249 emitFunctionStart(MachineFunction &MF)
251 // Print out the label for the function.
252 const Function *F = MF.getFunction();
254 SwitchToSection(TAI->SectionForGlobal(F));
256 // Mark the start of the function
257 O << "\t.cc_top " << CurrentFnName << ".function," << CurrentFnName << "\n";
259 switch (F->getLinkage()) {
260 default: assert(0 && "Unknown linkage type!");
261 case Function::InternalLinkage: // Symbols default to internal.
263 case Function::ExternalLinkage:
264 emitGlobalDirective(CurrentFnName);
266 case Function::LinkOnceLinkage:
267 case Function::WeakLinkage:
268 // TODO Use COMDAT groups for LinkOnceLinkage
269 O << TAI->getGlobalDirective() << CurrentFnName << "\n";
270 O << TAI->getWeakDefDirective() << CurrentFnName << "\n";
273 // (1 << 1) byte aligned
274 EmitAlignment(1, F, 1);
275 if (TAI->hasDotTypeDotSizeDirective()) {
276 O << "\t.type " << CurrentFnName << ",@function\n";
278 O << CurrentFnName << ":\n";
281 /// Emit the directives on the end of functions
282 void XCoreAsmPrinter::
283 emitFunctionEnd(MachineFunction &MF)
285 // Mark the end of the function
286 O << "\t.cc_bottom " << CurrentFnName << ".function\n";
289 /// runOnMachineFunction - This uses the printMachineInstruction()
290 /// method to print assembly for each instruction.
292 bool XCoreAsmPrinter::runOnMachineFunction(MachineFunction &MF)
294 SetupMachineFunction(MF);
296 // Print out constants referenced by the function
297 EmitConstantPool(MF.getConstantPool());
299 // Print out jump tables referenced by the function
300 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
302 // What's my mangled name?
303 CurrentFnName = Mang->getValueName(MF.getFunction());
305 // Emit the function start directives
306 emitFunctionStart(MF);
308 // Emit pre-function debug information.
309 DW->BeginFunction(&MF);
311 // Print out code for the function.
312 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
315 // Print a label for the basic block.
316 if (I != MF.begin()) {
317 printBasicBlockLabel(I, true , true);
321 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
323 // Print the assembly for the instruction.
325 printMachineInstruction(II);
328 // Each Basic Block is separated by a newline
332 // Emit function end directives
335 // Emit post-function debug information.
336 DW->EndFunction(&MF);
338 // We didn't modify anything.
342 void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum)
344 printOperand(MI, opNum);
346 if (MI->getOperand(opNum+1).isImm()
347 && MI->getOperand(opNum+1).getImm() == 0)
351 printOperand(MI, opNum+1);
354 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
355 const MachineOperand &MO = MI->getOperand(opNum);
356 switch (MO.getType()) {
357 case MachineOperand::MO_Register:
358 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
359 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
361 assert(0 && "not implemented");
363 case MachineOperand::MO_Immediate:
366 case MachineOperand::MO_MachineBasicBlock:
367 printBasicBlockLabel(MO.getMBB());
369 case MachineOperand::MO_GlobalAddress:
370 O << Mang->getValueName(MO.getGlobal());
371 if (MO.getGlobal()->hasExternalWeakLinkage())
372 ExtWeakSymbols.insert(MO.getGlobal());
374 case MachineOperand::MO_ExternalSymbol:
375 O << MO.getSymbolName();
377 case MachineOperand::MO_ConstantPoolIndex:
378 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
379 << '_' << MO.getIndex();
381 case MachineOperand::MO_JumpTableIndex:
382 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
383 << '_' << MO.getIndex();
386 assert(0 && "not implemented");
390 /// PrintAsmOperand - Print out an operand for an inline asm expression.
392 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
394 const char *ExtraCode) {
395 printOperand(MI, OpNo);
399 void XCoreAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
402 // Check for mov mnemonic
404 if (TM.getInstrInfo()->isMoveInstr(*MI, src, dst)) {
406 O << TM.getRegisterInfo()->get(dst).AsmName;
408 O << TM.getRegisterInfo()->get(src).AsmName;
412 if (printInstruction(MI)) {
415 assert(0 && "Unhandled instruction in asm writer!");
418 bool XCoreAsmPrinter::doInitialization(Module &M) {
419 bool Result = AsmPrinter::doInitialization(M);
421 if (!FileDirective.empty()) {
422 emitFileDirective(FileDirective);
425 // Print out type strings for external functions here
426 for (Module::const_iterator I = M.begin(), E = M.end();
428 if (I->isDeclaration() && !I->isIntrinsic()) {
429 switch (I->getLinkage()) {
431 assert(0 && "Unexpected linkage");
432 case Function::ExternalWeakLinkage:
433 ExtWeakSymbols.insert(I);
435 case Function::ExternalLinkage:
441 // Emit initial debug information.
442 DW = getAnalysisToUpdate<DwarfWriter>();
443 assert(DW && "Dwarf Writer is not available");
444 DW->BeginModule(&M, getAnalysisToUpdate<MachineModuleInfo>(),
449 bool XCoreAsmPrinter::doFinalization(Module &M) {
451 // Print out module-level global variables.
452 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
457 // Emit final debug information.
460 return AsmPrinter::doFinalization(M);