1 //===-- PIC16AsmPrinter.cpp - PIC16 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 PIC16 assembly language.
13 //===----------------------------------------------------------------------===//
15 #include "PIC16ABINames.h"
16 #include "PIC16AsmPrinter.h"
17 #include "PIC16Section.h"
18 #include "PIC16MCAsmInfo.h"
19 #include "llvm/DerivedTypes.h"
20 #include "llvm/Function.h"
21 #include "llvm/Module.h"
22 #include "llvm/CodeGen/DwarfWriter.h"
23 #include "llvm/CodeGen/MachineFrameInfo.h"
24 #include "llvm/CodeGen/DwarfWriter.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/MC/MCStreamer.h"
27 #include "llvm/MC/MCSymbol.h"
28 #include "llvm/Target/TargetRegistry.h"
29 #include "llvm/Target/TargetLoweringObjectFile.h"
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Support/FormattedStream.h"
32 #include "llvm/Support/Mangler.h"
36 #include "PIC16GenAsmWriter.inc"
38 PIC16AsmPrinter::PIC16AsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
39 const MCAsmInfo *T, bool V)
40 : AsmPrinter(O, TM, T, V), DbgInfo(O, T) {
41 PTLI = static_cast<PIC16TargetLowering*>(TM.getTargetLowering());
42 PMAI = static_cast<const PIC16MCAsmInfo*>(T);
43 PTOF = (PIC16TargetObjectFile *)&PTLI->getObjFileLowering();
46 bool PIC16AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
47 processDebugLoc(MI, true);
52 processDebugLoc(MI, false);
56 static int getFunctionColor(const Function *F) {
57 if (F->hasSection()) {
58 std::string Sectn = F->getSection();
59 std::string StrToFind = "Overlay=";
60 std::string::size_type Pos = Sectn.find(StrToFind);
62 // Retreive the color number if the key is found.
63 if (Pos != std::string::npos) {
64 Pos += StrToFind.length();
65 std::string Color = "";
66 char c = Sectn.at(Pos);
67 // A Color can only consist of digits.
68 while (c >= '0' && c<= '9') {
71 if (Pos >= Sectn.length())
75 return atoi(Color.c_str());
79 // Color was not set for function, so return -1.
83 // Color the Auto section of the given function.
84 void PIC16AsmPrinter::ColorAutoSection(const Function *F) {
85 std::string SectionName = PAN::getAutosSectionName(CurrentFnName);
86 PIC16Section* Section = PTOF->findPIC16Section(SectionName);
87 if (Section != NULL) {
88 int Color = getFunctionColor(F);
90 Section->setColor(Color);
95 /// runOnMachineFunction - This emits the frame section, autos section and
96 /// assembly for each instruction. Also takes care of function begin debug
97 /// directive and file begin debug directive (if required) for the function.
99 bool PIC16AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
102 // This calls the base class function required to be called at beginning
103 // of runOnMachineFunction.
104 SetupMachineFunction(MF);
106 // Get the mangled name.
107 const Function *F = MF.getFunction();
108 CurrentFnName = Mang->getMangledName(F);
110 // Put the color information from function to its auto section.
113 // Emit the function frame (args and temps).
114 EmitFunctionFrame(MF);
116 DbgInfo.BeginFunction(MF);
118 // Now emit the instructions of function in its code section.
119 const MCSection *fCodeSection
120 = getObjFileLowering().SectionForCode(CurrentFnName);
122 // Start the Code Section.
124 OutStreamer.SwitchSection(fCodeSection);
126 // Emit the frame address of the function at the beginning of code.
127 O << "\tretlw low(" << PAN::getFrameLabel(CurrentFnName) << ")\n";
128 O << "\tretlw high(" << PAN::getFrameLabel(CurrentFnName) << ")\n";
130 // Emit function start label.
131 O << CurrentFnName << ":\n";
135 // Print out code for the function.
136 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
139 // Print a label for the basic block.
140 if (I != MF.begin()) {
141 EmitBasicBlockStart(I);
144 // Print a basic block.
145 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
148 // Emit the line directive if source line changed.
149 const DebugLoc DL = II->getDebugLoc();
150 if (!DL.isUnknown() && DL != CurDL) {
151 DbgInfo.ChangeDebugLoc(MF, DL);
155 // Print the assembly for the instruction.
156 printMachineInstruction(II);
160 // Emit function end debug directives.
161 DbgInfo.EndFunction(MF);
163 return false; // we didn't modify anything.
167 // printOperand - print operand of insn.
168 void PIC16AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
169 const MachineOperand &MO = MI->getOperand(opNum);
171 switch (MO.getType()) {
172 case MachineOperand::MO_Register:
173 O << getRegisterName(MO.getReg());
176 case MachineOperand::MO_Immediate:
177 O << (int)MO.getImm();
180 case MachineOperand::MO_GlobalAddress: {
181 std::string Sname = Mang->getMangledName(MO.getGlobal());
182 // FIXME: currently we do not have a memcpy def coming in the module
183 // by any chance, as we do not link in those as .bc lib. So these calls
184 // are always external and it is safe to emit an extern.
185 if (PAN::isMemIntrinsic(Sname)) {
186 LibcallDecls.push_back(createESName(Sname));
192 case MachineOperand::MO_ExternalSymbol: {
193 const char *Sname = MO.getSymbolName();
195 // If its a libcall name, record it to decls section.
196 if (PAN::getSymbolTag(Sname) == PAN::LIBCALL) {
197 LibcallDecls.push_back(Sname);
200 // Record a call to intrinsic to print the extern declaration for it.
201 std::string Sym = Sname;
202 if (PAN::isMemIntrinsic(Sym)) {
203 Sym = PAN::addPrefix(Sym);
204 LibcallDecls.push_back(createESName(Sym));
210 case MachineOperand::MO_MachineBasicBlock:
211 GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
215 llvm_unreachable(" Operand type not supported.");
219 /// printCCOperand - Print the cond code operand.
221 void PIC16AsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
222 int CC = (int)MI->getOperand(opNum).getImm();
223 O << PIC16CondCodeToString((PIC16CC::CondCodes)CC);
226 // This function is used to sort the decls list.
227 // should return true if s1 should come before s2.
228 static bool is_before(const char *s1, const char *s2) {
229 return strcmp(s1, s2) <= 0;
232 // This is used by list::unique below.
233 // unique will filter out duplicates if it knows them.
234 static bool is_duplicate(const char *s1, const char *s2) {
235 return !strcmp(s1, s2);
238 /// printLibcallDecls - print the extern declarations for compiler
241 void PIC16AsmPrinter::printLibcallDecls() {
242 // If no libcalls used, return.
243 if (LibcallDecls.empty()) return;
245 O << MAI->getCommentString() << "External decls for libcalls - BEGIN." <<"\n";
246 // Remove duplicate entries.
247 LibcallDecls.sort(is_before);
248 LibcallDecls.unique(is_duplicate);
250 for (std::list<const char*>::const_iterator I = LibcallDecls.begin();
251 I != LibcallDecls.end(); I++) {
252 O << MAI->getExternDirective() << *I << "\n";
253 O << MAI->getExternDirective() << PAN::getArgsLabel(*I) << "\n";
254 O << MAI->getExternDirective() << PAN::getRetvalLabel(*I) << "\n";
256 O << MAI->getCommentString() << "External decls for libcalls - END." <<"\n";
259 /// doInitialization - Perform Module level initializations here.
260 /// One task that we do here is to sectionize all global variables.
261 /// The MemSelOptimizer pass depends on the sectionizing.
263 bool PIC16AsmPrinter::doInitialization(Module &M) {
264 bool Result = AsmPrinter::doInitialization(M);
266 // FIXME:: This is temporary solution to generate the include file.
267 // The processor should be passed to llc as in input and the header file
268 // should be generated accordingly.
269 O << "\n\t#include P16F1937.INC\n";
271 // Set the section names for all globals.
272 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
275 // Record External Var Decls.
276 if (I->isDeclaration()) {
277 ExternalVarDecls.push_back(I);
281 // Record Exteranl Var Defs.
282 if (I->hasExternalLinkage() || I->hasCommonLinkage()) {
283 ExternalVarDefs.push_back(I);
286 // Sectionify actual data.
287 if (!I->hasAvailableExternallyLinkage()) {
288 const MCSection *S = getObjFileLowering().SectionForGlobal(I, Mang, TM);
290 I->setSection(((const PIC16Section *)S)->getName());
294 DbgInfo.BeginModule(M);
295 EmitFunctionDecls(M);
296 EmitUndefinedVars(M);
306 /// Emit extern decls for functions imported from other modules, and emit
307 /// global declarations for function defined in this module and which are
308 /// available to other modules.
310 void PIC16AsmPrinter::EmitFunctionDecls(Module &M) {
311 // Emit declarations for external functions.
312 O <<"\n"<<MAI->getCommentString() << "Function Declarations - BEGIN." <<"\n";
313 for (Module::iterator I = M.begin(), E = M.end(); I != E; I++) {
314 if (I->isIntrinsic())
317 std::string Name = Mang->getMangledName(I);
318 if (Name.compare("@abort") == 0)
321 if (!I->isDeclaration() && !I->hasExternalLinkage())
324 // Do not emit memcpy, memset, and memmove here.
325 // Calls to these routines can be generated in two ways,
326 // 1. User calling the standard lib function
327 // 2. Codegen generating these calls for llvm intrinsics.
328 // In the first case a prototype is alread availale, while in
329 // second case the call is via and externalsym and the prototype is missing.
330 // So declarations for these are currently always getting printing by
331 // tracking both kind of references in printInstrunction.
332 if (I->isDeclaration() && PAN::isMemIntrinsic(Name)) continue;
334 const char *directive = I->isDeclaration() ? MAI->getExternDirective() :
335 MAI->getGlobalDirective();
337 O << directive << Name << "\n";
338 O << directive << PAN::getRetvalLabel(Name) << "\n";
339 O << directive << PAN::getArgsLabel(Name) << "\n";
342 O << MAI->getCommentString() << "Function Declarations - END." <<"\n";
345 // Emit variables imported from other Modules.
346 void PIC16AsmPrinter::EmitUndefinedVars(Module &M) {
347 std::vector<const GlobalVariable*> Items = ExternalVarDecls;
348 if (!Items.size()) return;
350 O << "\n" << MAI->getCommentString() << "Imported Variables - BEGIN" << "\n";
351 for (unsigned j = 0; j < Items.size(); j++) {
352 O << MAI->getExternDirective() << Mang->getMangledName(Items[j]) << "\n";
354 O << MAI->getCommentString() << "Imported Variables - END" << "\n";
357 // Emit variables defined in this module and are available to other modules.
358 void PIC16AsmPrinter::EmitDefinedVars(Module &M) {
359 std::vector<const GlobalVariable*> Items = ExternalVarDefs;
360 if (!Items.size()) return;
362 O << "\n" << MAI->getCommentString() << "Exported Variables - BEGIN" << "\n";
363 for (unsigned j = 0; j < Items.size(); j++) {
364 O << MAI->getGlobalDirective() << Mang->getMangledName(Items[j]) << "\n";
366 O << MAI->getCommentString() << "Exported Variables - END" << "\n";
369 // Emit initialized data placed in ROM.
370 void PIC16AsmPrinter::EmitRomData(Module &M) {
371 EmitSingleSection(PTOF->ROMDATASection());
374 // Emit Shared section udata.
375 void PIC16AsmPrinter::EmitSharedUdata(Module &M) {
376 EmitSingleSection(PTOF->SHAREDUDATASection());
379 bool PIC16AsmPrinter::doFinalization(Module &M) {
382 DbgInfo.EndModule(M);
383 O << "\n\t" << "END\n";
384 return AsmPrinter::doFinalization(M);
387 void PIC16AsmPrinter::EmitFunctionFrame(MachineFunction &MF) {
388 const Function *F = MF.getFunction();
389 std::string FuncName = Mang->getMangledName(F);
390 const TargetData *TD = TM.getTargetData();
391 // Emit the data section name.
394 PIC16Section *fPDataSection = const_cast<PIC16Section *>(getObjFileLowering().
395 SectionForFrame(CurrentFnName));
397 fPDataSection->setColor(getFunctionColor(F));
398 OutStreamer.SwitchSection(fPDataSection);
400 // Emit function frame label
401 O << PAN::getFrameLabel(CurrentFnName) << ":\n";
403 const Type *RetType = F->getReturnType();
404 unsigned RetSize = 0;
405 if (RetType->getTypeID() != Type::VoidTyID)
406 RetSize = TD->getTypeAllocSize(RetType);
408 //Emit function return value space
409 // FIXME: Do not emit RetvalLable when retsize is zero. To do this
410 // we will need to avoid printing a global directive for Retval label
411 // in emitExternandGloblas.
413 O << PAN::getRetvalLabel(CurrentFnName) << " RES " << RetSize << "\n";
415 O << PAN::getRetvalLabel(CurrentFnName) << ": \n";
417 // Emit variable to hold the space for function arguments
418 unsigned ArgSize = 0;
419 for (Function::const_arg_iterator argi = F->arg_begin(),
420 arge = F->arg_end(); argi != arge ; ++argi) {
421 const Type *Ty = argi->getType();
422 ArgSize += TD->getTypeAllocSize(Ty);
425 O << PAN::getArgsLabel(CurrentFnName) << " RES " << ArgSize << "\n";
427 // Emit temporary space
428 int TempSize = PTLI->GetTmpSize();
430 O << PAN::getTempdataLabel(CurrentFnName) << " RES " << TempSize << '\n';
434 void PIC16AsmPrinter::EmitInitializedDataSection(const PIC16Section *S) {
435 /// Emit Section header.
436 OutStreamer.SwitchSection(S);
438 std::vector<const GlobalVariable*> Items = S->Items;
439 for (unsigned j = 0; j < Items.size(); j++) {
440 std::string Name = Mang->getMangledName(Items[j]);
441 Constant *C = Items[j]->getInitializer();
442 int AddrSpace = Items[j]->getType()->getAddressSpace();
444 EmitGlobalConstant(C, AddrSpace);
448 // Print all IDATA sections.
449 void PIC16AsmPrinter::EmitIData(Module &M) {
450 EmitSectionList (M, PTOF->IDATASections());
453 void PIC16AsmPrinter::
454 EmitUninitializedDataSection(const PIC16Section *S) {
455 const TargetData *TD = TM.getTargetData();
456 OutStreamer.SwitchSection(S);
457 std::vector<const GlobalVariable*> Items = S->Items;
458 for (unsigned j = 0; j < Items.size(); j++) {
459 std::string Name = Mang->getMangledName(Items[j]);
460 Constant *C = Items[j]->getInitializer();
461 const Type *Ty = C->getType();
462 unsigned Size = TD->getTypeAllocSize(Ty);
463 O << Name << " RES " << Size << "\n";
467 // Print all UDATA sections.
468 void PIC16AsmPrinter::EmitUData(Module &M) {
469 EmitSectionList (M, PTOF->UDATASections());
472 // Print all USER sections.
473 void PIC16AsmPrinter::EmitUserSections(Module &M) {
474 EmitSectionList (M, PTOF->USERSections());
477 // Print all AUTO sections.
478 void PIC16AsmPrinter::EmitAllAutos(Module &M) {
479 EmitSectionList (M, PTOF->AUTOSections());
482 extern "C" void LLVMInitializePIC16AsmPrinter() {
483 RegisterAsmPrinter<PIC16AsmPrinter> X(ThePIC16Target);
486 // Emit one data section using correct section emitter based on section type.
487 void PIC16AsmPrinter::EmitSingleSection(const PIC16Section *S) {
488 if (S == NULL) return;
490 switch (S->getType()) {
491 default: llvm_unreachable ("unknow user section type");
495 EmitUninitializedDataSection(S);
499 EmitInitializedDataSection(S);
504 // Emit a list of sections.
505 void PIC16AsmPrinter::
506 EmitSectionList(Module &M, const std::vector<PIC16Section *> &SList) {
507 for (unsigned i = 0; i < SList.size(); i++) {
508 // Exclude llvm specific metadata sections.
509 if (SList[i]->getName().find("llvm.") != std::string::npos)
512 EmitSingleSection(SList[i]);