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, bool V)
62 : AsmPrinter(O, TM, T, V), 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(), verbose);
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::LinkOnceAnyLinkage:
192 case GlobalValue::LinkOnceODRLinkage:
193 case GlobalValue::WeakAnyLinkage:
194 case GlobalValue::WeakODRLinkage:
195 case GlobalValue::ExternalLinkage:
196 emitArrayBound(name, GV);
197 emitGlobalDirective(name);
198 // TODO Use COMDAT groups for LinkOnceLinkage
199 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
200 O << TAI->getWeakDefDirective() << name << "\n";
203 case GlobalValue::InternalLinkage:
204 case GlobalValue::PrivateLinkage:
206 case GlobalValue::GhostLinkage:
207 cerr << "Should not have any unmaterialized functions!\n";
209 case GlobalValue::DLLImportLinkage:
210 cerr << "DLLImport linkage is not supported by this target!\n";
212 case GlobalValue::DLLExportLinkage:
213 cerr << "DLLExport linkage is not supported by this target!\n";
216 assert(0 && "Unknown linkage type!");
219 EmitAlignment(Align, GV, 2);
221 unsigned Size = TD->getTypeAllocSize(C->getType());
222 if (GV->isThreadLocal()) {
225 if (TAI->hasDotTypeDotSizeDirective()) {
226 O << "\t.type " << name << ",@object\n";
227 O << "\t.size " << name << "," << Size << "\n";
231 EmitGlobalConstant(C);
232 if (GV->isThreadLocal()) {
233 for (unsigned i = 1; i < MaxThreads; ++i) {
234 EmitGlobalConstant(C);
238 // The ABI requires that unsigned scalar types smaller than 32 bits
239 // are are padded to 32 bits.
243 // Mark the end of the global
244 O << "\t.cc_bottom " << name << ".data\n";
248 /// Emit the directives on the start of functions
249 void XCoreAsmPrinter::
250 emitFunctionStart(MachineFunction &MF)
252 // Print out the label for the function.
253 const Function *F = MF.getFunction();
255 SwitchToSection(TAI->SectionForGlobal(F));
257 // Mark the start of the function
258 O << "\t.cc_top " << CurrentFnName << ".function," << CurrentFnName << "\n";
260 switch (F->getLinkage()) {
261 default: assert(0 && "Unknown linkage type!");
262 case Function::InternalLinkage: // Symbols default to internal.
263 case Function::PrivateLinkage:
265 case Function::ExternalLinkage:
266 emitGlobalDirective(CurrentFnName);
268 case Function::LinkOnceAnyLinkage:
269 case Function::LinkOnceODRLinkage:
270 case Function::WeakAnyLinkage:
271 case Function::WeakODRLinkage:
272 // TODO Use COMDAT groups for LinkOnceLinkage
273 O << TAI->getGlobalDirective() << CurrentFnName << "\n";
274 O << TAI->getWeakDefDirective() << CurrentFnName << "\n";
277 // (1 << 1) byte aligned
278 EmitAlignment(MF.getAlignment(), F, 1);
279 if (TAI->hasDotTypeDotSizeDirective()) {
280 O << "\t.type " << CurrentFnName << ",@function\n";
282 O << CurrentFnName << ":\n";
285 /// Emit the directives on the end of functions
286 void XCoreAsmPrinter::
287 emitFunctionEnd(MachineFunction &MF)
289 // Mark the end of the function
290 O << "\t.cc_bottom " << CurrentFnName << ".function\n";
293 /// runOnMachineFunction - This uses the printMachineInstruction()
294 /// method to print assembly for each instruction.
296 bool XCoreAsmPrinter::runOnMachineFunction(MachineFunction &MF)
300 SetupMachineFunction(MF);
302 // Print out constants referenced by the function
303 EmitConstantPool(MF.getConstantPool());
305 // Print out jump tables referenced by the function
306 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
308 // Emit the function start directives
309 emitFunctionStart(MF);
311 // Emit pre-function debug information.
312 DW->BeginFunction(&MF);
314 // Print out code for the function.
315 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
318 // Print a label for the basic block.
319 if (I != MF.begin()) {
320 printBasicBlockLabel(I, true , true);
324 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
326 // Print the assembly for the instruction.
328 printMachineInstruction(II);
331 // Each Basic Block is separated by a newline
335 // Emit function end directives
338 // Emit post-function debug information.
339 DW->EndFunction(&MF);
341 // We didn't modify anything.
345 void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum)
347 printOperand(MI, opNum);
349 if (MI->getOperand(opNum+1).isImm()
350 && MI->getOperand(opNum+1).getImm() == 0)
354 printOperand(MI, opNum+1);
357 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
358 const MachineOperand &MO = MI->getOperand(opNum);
359 switch (MO.getType()) {
360 case MachineOperand::MO_Register:
361 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
362 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
364 assert(0 && "not implemented");
366 case MachineOperand::MO_Immediate:
369 case MachineOperand::MO_MachineBasicBlock:
370 printBasicBlockLabel(MO.getMBB());
372 case MachineOperand::MO_GlobalAddress:
373 O << Mang->getValueName(MO.getGlobal());
375 case MachineOperand::MO_ExternalSymbol:
376 O << MO.getSymbolName();
378 case MachineOperand::MO_ConstantPoolIndex:
379 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
380 << '_' << MO.getIndex();
382 case MachineOperand::MO_JumpTableIndex:
383 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
384 << '_' << MO.getIndex();
387 assert(0 && "not implemented");
391 /// PrintAsmOperand - Print out an operand for an inline asm expression.
393 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
395 const char *ExtraCode) {
396 printOperand(MI, OpNo);
400 void XCoreAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
403 // Check for mov mnemonic
404 unsigned src, dst, srcSR, dstSR;
405 if (TM.getInstrInfo()->isMoveInstr(*MI, src, dst, srcSR, dstSR)) {
407 O << TM.getRegisterInfo()->get(dst).AsmName;
409 O << TM.getRegisterInfo()->get(src).AsmName;
413 if (printInstruction(MI)) {
416 assert(0 && "Unhandled instruction in asm writer!");
419 bool XCoreAsmPrinter::doInitialization(Module &M) {
420 bool Result = AsmPrinter::doInitialization(M);
421 DW = getAnalysisIfAvailable<DwarfWriter>();
423 if (!FileDirective.empty())
424 emitFileDirective(FileDirective);
429 bool XCoreAsmPrinter::doFinalization(Module &M) {
431 // Print out module-level global variables.
432 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
437 return AsmPrinter::doFinalization(M);