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 XCoreAsmPrinter(raw_ostream &O, XCoreTargetMachine &TM,
61 const TargetAsmInfo *T, bool F)
62 : AsmPrinter(O, TM, T, F), DW(0),
63 Subtarget(*TM.getSubtargetImpl()) {}
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,
109 return new XCoreAsmPrinter(o, tm, tm.getTargetAsmInfo(), fast);
112 // PrintEscapedString - Print each character of the specified string, escaping
113 // it if it is not printable or if it is an escape char.
114 static void PrintEscapedString(const std::string &Str, raw_ostream &Out) {
115 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
116 unsigned char C = Str[i];
117 if (isprint(C) && C != '"' && C != '\\') {
121 << (char) ((C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'))
122 << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
127 void XCoreAsmPrinter::
128 emitFileDirective(const std::string &name)
131 PrintEscapedString(name, O);
135 void XCoreAsmPrinter::
136 emitGlobalDirective(const std::string &name)
138 O << TAI->getGlobalDirective() << name;
142 void XCoreAsmPrinter::
143 emitExternDirective(const std::string &name)
145 O << "\t.extern\t" << name;
149 void XCoreAsmPrinter::
150 emitArrayBound(const std::string &name, const GlobalVariable *GV)
152 assert(((GV->hasExternalLinkage() ||
153 GV->hasWeakLinkage()) ||
154 GV->hasLinkOnceLinkage()) && "Unexpected linkage");
155 if (const ArrayType *ATy = dyn_cast<ArrayType>(
156 cast<PointerType>(GV->getType())->getElementType()))
158 O << TAI->getGlobalDirective() << name << ".globound" << "\n";
159 O << TAI->getSetDirective() << name << ".globound" << ","
160 << ATy->getNumElements() << "\n";
161 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
162 // TODO Use COMDAT groups for LinkOnceLinkage
163 O << TAI->getWeakDefDirective() << name << ".globound" << "\n";
168 void XCoreAsmPrinter::
169 emitGlobal(const GlobalVariable *GV)
171 const TargetData *TD = TM.getTargetData();
173 if (GV->hasInitializer()) {
174 // Check to see if this is a special global used by LLVM, if so, emit it.
175 if (EmitSpecialLLVMGlobal(GV))
178 SwitchToSection(TAI->SectionForGlobal(GV));
180 std::string name = Mang->getValueName(GV);
181 Constant *C = GV->getInitializer();
182 unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
184 // Mark the start of the global
185 O << "\t.cc_top " << name << ".data," << name << "\n";
187 switch (GV->getLinkage()) {
188 case GlobalValue::AppendingLinkage:
189 cerr << "AppendingLinkage is not supported by this target!\n";
191 case GlobalValue::LinkOnceLinkage:
192 case GlobalValue::WeakLinkage:
193 case GlobalValue::ExternalLinkage:
194 emitArrayBound(name, GV);
195 emitGlobalDirective(name);
196 // TODO Use COMDAT groups for LinkOnceLinkage
197 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
198 O << TAI->getWeakDefDirective() << name << "\n";
201 case GlobalValue::InternalLinkage:
202 case GlobalValue::PrivateLinkage:
204 case GlobalValue::GhostLinkage:
205 cerr << "Should not have any unmaterialized functions!\n";
207 case GlobalValue::DLLImportLinkage:
208 cerr << "DLLImport linkage is not supported by this target!\n";
210 case GlobalValue::DLLExportLinkage:
211 cerr << "DLLExport linkage is not supported by this target!\n";
214 assert(0 && "Unknown linkage type!");
217 EmitAlignment(Align, GV, 2);
219 unsigned Size = TD->getTypePaddedSize(C->getType());
220 if (GV->isThreadLocal()) {
223 if (TAI->hasDotTypeDotSizeDirective()) {
224 O << "\t.type " << name << ",@object\n";
225 O << "\t.size " << name << "," << Size << "\n";
229 EmitGlobalConstant(C);
230 if (GV->isThreadLocal()) {
231 for (unsigned i = 1; i < MaxThreads; ++i) {
232 EmitGlobalConstant(C);
236 // The ABI requires that unsigned scalar types smaller than 32 bits
237 // are are padded to 32 bits.
241 // Mark the end of the global
242 O << "\t.cc_bottom " << name << ".data\n";
244 if (GV->hasExternalWeakLinkage())
245 ExtWeakSymbols.insert(GV);
249 /// Emit the directives on the start of functions
250 void XCoreAsmPrinter::
251 emitFunctionStart(MachineFunction &MF)
253 // Print out the label for the function.
254 const Function *F = MF.getFunction();
256 SwitchToSection(TAI->SectionForGlobal(F));
258 // Mark the start of the function
259 O << "\t.cc_top " << CurrentFnName << ".function," << CurrentFnName << "\n";
261 switch (F->getLinkage()) {
262 default: assert(0 && "Unknown linkage type!");
263 case Function::InternalLinkage: // Symbols default to internal.
264 case Function::PrivateLinkage:
266 case Function::ExternalLinkage:
267 emitGlobalDirective(CurrentFnName);
269 case Function::LinkOnceLinkage:
270 case Function::WeakLinkage:
271 // TODO Use COMDAT groups for LinkOnceLinkage
272 O << TAI->getGlobalDirective() << CurrentFnName << "\n";
273 O << TAI->getWeakDefDirective() << CurrentFnName << "\n";
276 // (1 << 1) byte aligned
277 EmitAlignment(1, F, 1);
278 if (TAI->hasDotTypeDotSizeDirective()) {
279 O << "\t.type " << CurrentFnName << ",@function\n";
281 O << CurrentFnName << ":\n";
284 /// Emit the directives on the end of functions
285 void XCoreAsmPrinter::
286 emitFunctionEnd(MachineFunction &MF)
288 // Mark the end of the function
289 O << "\t.cc_bottom " << CurrentFnName << ".function\n";
292 /// runOnMachineFunction - This uses the printMachineInstruction()
293 /// method to print assembly for each instruction.
295 bool XCoreAsmPrinter::runOnMachineFunction(MachineFunction &MF)
299 SetupMachineFunction(MF);
301 // Print out constants referenced by the function
302 EmitConstantPool(MF.getConstantPool());
304 // Print out jump tables referenced by the function
305 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
307 // Emit the function start directives
308 emitFunctionStart(MF);
310 // Emit pre-function debug information.
311 DW->BeginFunction(&MF);
313 // Print out code for the function.
314 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
317 // Print a label for the basic block.
318 if (I != MF.begin()) {
319 printBasicBlockLabel(I, true , true);
323 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
325 // Print the assembly for the instruction.
327 printMachineInstruction(II);
330 // Each Basic Block is separated by a newline
334 // Emit function end directives
337 // Emit post-function debug information.
338 DW->EndFunction(&MF);
340 // We didn't modify anything.
344 void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum)
346 printOperand(MI, opNum);
348 if (MI->getOperand(opNum+1).isImm()
349 && MI->getOperand(opNum+1).getImm() == 0)
353 printOperand(MI, opNum+1);
356 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
357 const MachineOperand &MO = MI->getOperand(opNum);
358 switch (MO.getType()) {
359 case MachineOperand::MO_Register:
360 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
361 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
363 assert(0 && "not implemented");
365 case MachineOperand::MO_Immediate:
368 case MachineOperand::MO_MachineBasicBlock:
369 printBasicBlockLabel(MO.getMBB());
371 case MachineOperand::MO_GlobalAddress:
373 const GlobalValue *GV = MO.getGlobal();
374 O << Mang->getValueName(GV);
375 if (GV->hasExternalWeakLinkage())
376 ExtWeakSymbols.insert(GV);
379 case MachineOperand::MO_ExternalSymbol:
380 O << MO.getSymbolName();
382 case MachineOperand::MO_ConstantPoolIndex:
383 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
384 << '_' << MO.getIndex();
386 case MachineOperand::MO_JumpTableIndex:
387 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
388 << '_' << MO.getIndex();
391 assert(0 && "not implemented");
395 /// PrintAsmOperand - Print out an operand for an inline asm expression.
397 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
399 const char *ExtraCode) {
400 printOperand(MI, OpNo);
404 void XCoreAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
407 // Check for mov mnemonic
408 unsigned src, dst, srcSR, dstSR;
409 if (TM.getInstrInfo()->isMoveInstr(*MI, src, dst, srcSR, dstSR)) {
411 O << TM.getRegisterInfo()->get(dst).AsmName;
413 O << TM.getRegisterInfo()->get(src).AsmName;
417 if (printInstruction(MI)) {
420 assert(0 && "Unhandled instruction in asm writer!");
423 bool XCoreAsmPrinter::doInitialization(Module &M) {
424 bool Result = AsmPrinter::doInitialization(M);
426 if (!FileDirective.empty()) {
427 emitFileDirective(FileDirective);
430 // Print out type strings for external functions here
431 for (Module::const_iterator I = M.begin(), E = M.end();
433 if (I->isDeclaration() && !I->isIntrinsic()) {
434 switch (I->getLinkage()) {
436 assert(0 && "Unexpected linkage");
437 case Function::ExternalWeakLinkage:
438 ExtWeakSymbols.insert(I);
440 case Function::ExternalLinkage:
446 // Emit initial debug information.
447 DW = getAnalysisIfAvailable<DwarfWriter>();
448 assert(DW && "Dwarf Writer is not available");
449 DW->BeginModule(&M, getAnalysisIfAvailable<MachineModuleInfo>(),
454 bool XCoreAsmPrinter::doFinalization(Module &M) {
456 // Print out module-level global variables.
457 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
462 // Emit final debug information.
465 return AsmPrinter::doFinalization(M);