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(O, this, T),
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>();
96 } // end of anonymous namespace
98 #include "XCoreGenAsmWriter.inc"
100 /// createXCoreCodePrinterPass - Returns a pass that prints the XCore
101 /// assembly code for a MachineFunction to the given output stream,
102 /// using the given target machine description. This should work
103 /// regardless of whether the function is in SSA form.
105 FunctionPass *llvm::createXCoreCodePrinterPass(raw_ostream &o,
106 XCoreTargetMachine &tm) {
107 return new XCoreAsmPrinter(o, tm, tm.getTargetAsmInfo());
110 // PrintEscapedString - Print each character of the specified string, escaping
111 // it if it is not printable or if it is an escape char.
112 static void PrintEscapedString(const std::string &Str, raw_ostream &Out) {
113 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
114 unsigned char C = Str[i];
115 if (isprint(C) && C != '"' && C != '\\') {
119 << (char) ((C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'))
120 << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
125 void XCoreAsmPrinter::
126 emitFileDirective(const std::string &name)
129 PrintEscapedString(name, O);
133 void XCoreAsmPrinter::
134 emitGlobalDirective(const std::string &name)
136 O << TAI->getGlobalDirective() << name;
140 void XCoreAsmPrinter::
141 emitExternDirective(const std::string &name)
143 O << "\t.extern\t" << name;
147 void XCoreAsmPrinter::
148 emitArrayBound(const std::string &name, const GlobalVariable *GV)
150 assert(((GV->hasExternalLinkage() ||
151 GV->hasWeakLinkage()) ||
152 GV->hasLinkOnceLinkage()) && "Unexpected linkage");
153 if (const ArrayType *ATy = dyn_cast<ArrayType>(
154 cast<PointerType>(GV->getType())->getElementType()))
156 O << TAI->getGlobalDirective() << name << ".globound" << "\n";
157 O << TAI->getSetDirective() << name << ".globound" << ","
158 << ATy->getNumElements() << "\n";
159 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
160 // TODO Use COMDAT groups for LinkOnceLinkage
161 O << TAI->getWeakDefDirective() << name << ".globound" << "\n";
166 void XCoreAsmPrinter::
167 emitGlobal(const GlobalVariable *GV)
169 const TargetData *TD = TM.getTargetData();
171 if (GV->hasInitializer()) {
172 // Check to see if this is a special global used by LLVM, if so, emit it.
173 if (EmitSpecialLLVMGlobal(GV))
176 SwitchToSection(TAI->SectionForGlobal(GV));
178 std::string name = Mang->getValueName(GV);
179 Constant *C = GV->getInitializer();
180 unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
182 // Mark the start of the global
183 O << "\t.cc_top " << name << ".data," << name << "\n";
185 switch (GV->getLinkage()) {
186 case GlobalValue::AppendingLinkage:
187 cerr << "AppendingLinkage is not supported by this target!\n";
189 case GlobalValue::LinkOnceLinkage:
190 case GlobalValue::WeakLinkage:
191 case GlobalValue::ExternalLinkage:
192 emitArrayBound(name, GV);
193 emitGlobalDirective(name);
194 // TODO Use COMDAT groups for LinkOnceLinkage
195 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
196 O << TAI->getWeakDefDirective() << name << "\n";
199 case GlobalValue::InternalLinkage:
201 case GlobalValue::GhostLinkage:
202 cerr << "Should not have any unmaterialized functions!\n";
204 case GlobalValue::DLLImportLinkage:
205 cerr << "DLLImport linkage is not supported by this target!\n";
207 case GlobalValue::DLLExportLinkage:
208 cerr << "DLLExport linkage is not supported by this target!\n";
211 assert(0 && "Unknown linkage type!");
214 EmitAlignment(Align, GV, 2);
216 unsigned Size = TD->getABITypeSize(C->getType());
217 if (GV->isThreadLocal()) {
220 if (TAI->hasDotTypeDotSizeDirective()) {
221 O << "\t.type " << name << ",@object\n";
222 O << "\t.size " << name << "," << Size << "\n";
226 EmitGlobalConstant(C);
227 if (GV->isThreadLocal()) {
228 for (unsigned i = 1; i < MaxThreads; ++i) {
229 EmitGlobalConstant(C);
233 // The ABI requires that unsigned scalar types smaller than 32 bits
234 // are are padded to 32 bits.
238 // Mark the end of the global
239 O << "\t.cc_bottom " << name << ".data\n";
241 if (GV->hasExternalWeakLinkage())
242 ExtWeakSymbols.insert(GV);
246 /// Emit the directives on the start of functions
247 void XCoreAsmPrinter::
248 emitFunctionStart(MachineFunction &MF)
250 // Print out the label for the function.
251 const Function *F = MF.getFunction();
253 SwitchToSection(TAI->SectionForGlobal(F));
255 // Mark the start of the function
256 O << "\t.cc_top " << CurrentFnName << ".function," << CurrentFnName << "\n";
258 switch (F->getLinkage()) {
259 default: assert(0 && "Unknown linkage type!");
260 case Function::InternalLinkage: // Symbols default to internal.
262 case Function::ExternalLinkage:
263 emitGlobalDirective(CurrentFnName);
265 case Function::LinkOnceLinkage:
266 case Function::WeakLinkage:
267 // TODO Use COMDAT groups for LinkOnceLinkage
268 O << TAI->getGlobalDirective() << CurrentFnName << "\n";
269 O << TAI->getWeakDefDirective() << CurrentFnName << "\n";
272 // (1 << 1) byte aligned
273 EmitAlignment(1, F, 1);
274 if (TAI->hasDotTypeDotSizeDirective()) {
275 O << "\t.type " << CurrentFnName << ",@function\n";
277 O << CurrentFnName << ":\n";
280 /// Emit the directives on the end of functions
281 void XCoreAsmPrinter::
282 emitFunctionEnd(MachineFunction &MF)
284 // Mark the end of the function
285 O << "\t.cc_bottom " << CurrentFnName << ".function\n";
288 /// runOnMachineFunction - This uses the printMachineInstruction()
289 /// method to print assembly for each instruction.
291 bool XCoreAsmPrinter::runOnMachineFunction(MachineFunction &MF)
293 SetupMachineFunction(MF);
295 // Print out constants referenced by the function
296 EmitConstantPool(MF.getConstantPool());
298 // Print out jump tables referenced by the function
299 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
301 // What's my mangled name?
302 CurrentFnName = Mang->getValueName(MF.getFunction());
304 // Emit the function start directives
305 emitFunctionStart(MF);
307 // Emit pre-function debug information.
308 DW.BeginFunction(&MF);
310 // Print out code for the function.
311 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
314 // Print a label for the basic block.
315 if (I != MF.begin()) {
316 printBasicBlockLabel(I, true , true);
320 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
322 // Print the assembly for the instruction.
324 printMachineInstruction(II);
327 // Each Basic Block is separated by a newline
331 // Emit function end directives
334 // Emit post-function debug information.
337 // We didn't modify anything.
341 void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum)
343 printOperand(MI, opNum);
345 if (MI->getOperand(opNum+1).isImm()
346 && MI->getOperand(opNum+1).getImm() == 0)
350 printOperand(MI, opNum+1);
353 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
354 const MachineOperand &MO = MI->getOperand(opNum);
355 switch (MO.getType()) {
356 case MachineOperand::MO_Register:
357 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
358 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
360 assert(0 && "not implemented");
362 case MachineOperand::MO_Immediate:
365 case MachineOperand::MO_MachineBasicBlock:
366 printBasicBlockLabel(MO.getMBB());
368 case MachineOperand::MO_GlobalAddress:
369 O << Mang->getValueName(MO.getGlobal());
370 if (MO.getGlobal()->hasExternalWeakLinkage())
371 ExtWeakSymbols.insert(MO.getGlobal());
373 case MachineOperand::MO_ExternalSymbol:
374 O << MO.getSymbolName();
376 case MachineOperand::MO_ConstantPoolIndex:
377 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
378 << '_' << MO.getIndex();
380 case MachineOperand::MO_JumpTableIndex:
381 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
382 << '_' << MO.getIndex();
385 assert(0 && "not implemented");
389 /// PrintAsmOperand - Print out an operand for an inline asm expression.
391 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
393 const char *ExtraCode) {
394 printOperand(MI, OpNo);
398 void XCoreAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
401 // Check for mov mnemonic
403 if (TM.getInstrInfo()->isMoveInstr(*MI, src, dst)) {
405 O << TM.getRegisterInfo()->get(dst).AsmName;
407 O << TM.getRegisterInfo()->get(src).AsmName;
411 if (printInstruction(MI)) {
414 assert(0 && "Unhandled instruction in asm writer!");
417 bool XCoreAsmPrinter::doInitialization(Module &M) {
418 bool Result = AsmPrinter::doInitialization(M);
420 if (!FileDirective.empty()) {
421 emitFileDirective(FileDirective);
424 // Print out type strings for external functions here
425 for (Module::const_iterator I = M.begin(), E = M.end();
427 if (I->isDeclaration() && !I->isIntrinsic()) {
428 switch (I->getLinkage()) {
430 assert(0 && "Unexpected linkage");
431 case Function::ExternalWeakLinkage:
432 ExtWeakSymbols.insert(I);
434 case Function::ExternalLinkage:
440 // Emit initial debug information.
443 DW.SetModuleInfo(getAnalysisToUpdate<MachineModuleInfo>());
447 bool XCoreAsmPrinter::doFinalization(Module &M) {
449 // Print out module-level global variables.
450 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
455 // Emit final debug information.
458 return AsmPrinter::doFinalization(M);