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:
174 // For indirect load/store insns, the fsr name is printed as INDF.
175 std::string RegName = getRegisterName(MO.getReg());
176 if ((MI->getOpcode() == PIC16::load_indirect) ||
177 (MI->getOpcode() == PIC16::store_indirect))
179 RegName.replace (0, 3, "INDF");
185 case MachineOperand::MO_Immediate:
186 O << (int)MO.getImm();
189 case MachineOperand::MO_GlobalAddress: {
190 std::string Sname = Mang->getMangledName(MO.getGlobal());
191 // FIXME: currently we do not have a memcpy def coming in the module
192 // by any chance, as we do not link in those as .bc lib. So these calls
193 // are always external and it is safe to emit an extern.
194 if (PAN::isMemIntrinsic(Sname)) {
195 LibcallDecls.push_back(createESName(Sname));
201 case MachineOperand::MO_ExternalSymbol: {
202 const char *Sname = MO.getSymbolName();
204 // If its a libcall name, record it to decls section.
205 if (PAN::getSymbolTag(Sname) == PAN::LIBCALL) {
206 LibcallDecls.push_back(Sname);
209 // Record a call to intrinsic to print the extern declaration for it.
210 std::string Sym = Sname;
211 if (PAN::isMemIntrinsic(Sym)) {
212 Sym = PAN::addPrefix(Sym);
213 LibcallDecls.push_back(createESName(Sym));
219 case MachineOperand::MO_MachineBasicBlock:
220 GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
224 llvm_unreachable(" Operand type not supported.");
228 /// printCCOperand - Print the cond code operand.
230 void PIC16AsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
231 int CC = (int)MI->getOperand(opNum).getImm();
232 O << PIC16CondCodeToString((PIC16CC::CondCodes)CC);
235 // This function is used to sort the decls list.
236 // should return true if s1 should come before s2.
237 static bool is_before(const char *s1, const char *s2) {
238 return strcmp(s1, s2) <= 0;
241 // This is used by list::unique below.
242 // unique will filter out duplicates if it knows them.
243 static bool is_duplicate(const char *s1, const char *s2) {
244 return !strcmp(s1, s2);
247 /// printLibcallDecls - print the extern declarations for compiler
250 void PIC16AsmPrinter::printLibcallDecls() {
251 // If no libcalls used, return.
252 if (LibcallDecls.empty()) return;
254 O << MAI->getCommentString() << "External decls for libcalls - BEGIN." <<"\n";
255 // Remove duplicate entries.
256 LibcallDecls.sort(is_before);
257 LibcallDecls.unique(is_duplicate);
259 for (std::list<const char*>::const_iterator I = LibcallDecls.begin();
260 I != LibcallDecls.end(); I++) {
261 O << MAI->getExternDirective() << *I << "\n";
262 O << MAI->getExternDirective() << PAN::getArgsLabel(*I) << "\n";
263 O << MAI->getExternDirective() << PAN::getRetvalLabel(*I) << "\n";
265 O << MAI->getCommentString() << "External decls for libcalls - END." <<"\n";
268 /// doInitialization - Perform Module level initializations here.
269 /// One task that we do here is to sectionize all global variables.
270 /// The MemSelOptimizer pass depends on the sectionizing.
272 bool PIC16AsmPrinter::doInitialization(Module &M) {
273 bool Result = AsmPrinter::doInitialization(M);
275 // Every asmbly contains these std headers.
276 O << "\n#include p16f1xxx.inc";
277 O << "\n#include stdmacros.inc";
279 // Set the section names for all globals.
280 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
283 // Record External Var Decls.
284 if (I->isDeclaration()) {
285 ExternalVarDecls.push_back(I);
289 // Record Exteranl Var Defs.
290 if (I->hasExternalLinkage() || I->hasCommonLinkage()) {
291 ExternalVarDefs.push_back(I);
294 // Sectionify actual data.
295 if (!I->hasAvailableExternallyLinkage()) {
296 const MCSection *S = getObjFileLowering().SectionForGlobal(I, Mang, TM);
298 I->setSection(((const PIC16Section *)S)->getName());
302 DbgInfo.BeginModule(M);
303 EmitFunctionDecls(M);
304 EmitUndefinedVars(M);
314 /// Emit extern decls for functions imported from other modules, and emit
315 /// global declarations for function defined in this module and which are
316 /// available to other modules.
318 void PIC16AsmPrinter::EmitFunctionDecls(Module &M) {
319 // Emit declarations for external functions.
320 O <<"\n"<<MAI->getCommentString() << "Function Declarations - BEGIN." <<"\n";
321 for (Module::iterator I = M.begin(), E = M.end(); I != E; I++) {
322 if (I->isIntrinsic())
325 std::string Name = Mang->getMangledName(I);
326 if (Name.compare("@abort") == 0)
329 if (!I->isDeclaration() && !I->hasExternalLinkage())
332 // Do not emit memcpy, memset, and memmove here.
333 // Calls to these routines can be generated in two ways,
334 // 1. User calling the standard lib function
335 // 2. Codegen generating these calls for llvm intrinsics.
336 // In the first case a prototype is alread availale, while in
337 // second case the call is via and externalsym and the prototype is missing.
338 // So declarations for these are currently always getting printing by
339 // tracking both kind of references in printInstrunction.
340 if (I->isDeclaration() && PAN::isMemIntrinsic(Name)) continue;
342 const char *directive = I->isDeclaration() ? MAI->getExternDirective() :
343 MAI->getGlobalDirective();
345 O << directive << Name << "\n";
346 O << directive << PAN::getRetvalLabel(Name) << "\n";
347 O << directive << PAN::getArgsLabel(Name) << "\n";
350 O << MAI->getCommentString() << "Function Declarations - END." <<"\n";
353 // Emit variables imported from other Modules.
354 void PIC16AsmPrinter::EmitUndefinedVars(Module &M) {
355 std::vector<const GlobalVariable*> Items = ExternalVarDecls;
356 if (!Items.size()) return;
358 O << "\n" << MAI->getCommentString() << "Imported Variables - BEGIN" << "\n";
359 for (unsigned j = 0; j < Items.size(); j++) {
360 O << MAI->getExternDirective() << Mang->getMangledName(Items[j]) << "\n";
362 O << MAI->getCommentString() << "Imported Variables - END" << "\n";
365 // Emit variables defined in this module and are available to other modules.
366 void PIC16AsmPrinter::EmitDefinedVars(Module &M) {
367 std::vector<const GlobalVariable*> Items = ExternalVarDefs;
368 if (!Items.size()) return;
370 O << "\n" << MAI->getCommentString() << "Exported Variables - BEGIN" << "\n";
371 for (unsigned j = 0; j < Items.size(); j++) {
372 O << MAI->getGlobalDirective() << Mang->getMangledName(Items[j]) << "\n";
374 O << MAI->getCommentString() << "Exported Variables - END" << "\n";
377 // Emit initialized data placed in ROM.
378 void PIC16AsmPrinter::EmitRomData(Module &M) {
379 EmitSingleSection(PTOF->ROMDATASection());
382 // Emit Shared section udata.
383 void PIC16AsmPrinter::EmitSharedUdata(Module &M) {
384 EmitSingleSection(PTOF->SHAREDUDATASection());
387 bool PIC16AsmPrinter::doFinalization(Module &M) {
390 DbgInfo.EndModule(M);
391 O << "\n\t" << "END\n";
392 return AsmPrinter::doFinalization(M);
395 void PIC16AsmPrinter::EmitFunctionFrame(MachineFunction &MF) {
396 const Function *F = MF.getFunction();
397 std::string FuncName = Mang->getMangledName(F);
398 const TargetData *TD = TM.getTargetData();
399 // Emit the data section name.
402 PIC16Section *fPDataSection = const_cast<PIC16Section *>(getObjFileLowering().
403 SectionForFrame(CurrentFnName));
405 fPDataSection->setColor(getFunctionColor(F));
406 OutStreamer.SwitchSection(fPDataSection);
408 // Emit function frame label
409 O << PAN::getFrameLabel(CurrentFnName) << ":\n";
411 const Type *RetType = F->getReturnType();
412 unsigned RetSize = 0;
413 if (RetType->getTypeID() != Type::VoidTyID)
414 RetSize = TD->getTypeAllocSize(RetType);
416 //Emit function return value space
417 // FIXME: Do not emit RetvalLable when retsize is zero. To do this
418 // we will need to avoid printing a global directive for Retval label
419 // in emitExternandGloblas.
421 O << PAN::getRetvalLabel(CurrentFnName) << " RES " << RetSize << "\n";
423 O << PAN::getRetvalLabel(CurrentFnName) << ": \n";
425 // Emit variable to hold the space for function arguments
426 unsigned ArgSize = 0;
427 for (Function::const_arg_iterator argi = F->arg_begin(),
428 arge = F->arg_end(); argi != arge ; ++argi) {
429 const Type *Ty = argi->getType();
430 ArgSize += TD->getTypeAllocSize(Ty);
433 O << PAN::getArgsLabel(CurrentFnName) << " RES " << ArgSize << "\n";
435 // Emit temporary space
436 int TempSize = PTLI->GetTmpSize();
438 O << PAN::getTempdataLabel(CurrentFnName) << " RES " << TempSize << '\n';
442 void PIC16AsmPrinter::EmitInitializedDataSection(const PIC16Section *S) {
443 /// Emit Section header.
444 OutStreamer.SwitchSection(S);
446 std::vector<const GlobalVariable*> Items = S->Items;
447 for (unsigned j = 0; j < Items.size(); j++) {
448 std::string Name = Mang->getMangledName(Items[j]);
449 Constant *C = Items[j]->getInitializer();
450 int AddrSpace = Items[j]->getType()->getAddressSpace();
452 EmitGlobalConstant(C, AddrSpace);
456 // Print all IDATA sections.
457 void PIC16AsmPrinter::EmitIData(Module &M) {
458 EmitSectionList (M, PTOF->IDATASections());
461 void PIC16AsmPrinter::
462 EmitUninitializedDataSection(const PIC16Section *S) {
463 const TargetData *TD = TM.getTargetData();
464 OutStreamer.SwitchSection(S);
465 std::vector<const GlobalVariable*> Items = S->Items;
466 for (unsigned j = 0; j < Items.size(); j++) {
467 std::string Name = Mang->getMangledName(Items[j]);
468 Constant *C = Items[j]->getInitializer();
469 const Type *Ty = C->getType();
470 unsigned Size = TD->getTypeAllocSize(Ty);
471 O << Name << " RES " << Size << "\n";
475 // Print all UDATA sections.
476 void PIC16AsmPrinter::EmitUData(Module &M) {
477 EmitSectionList (M, PTOF->UDATASections());
480 // Print all USER sections.
481 void PIC16AsmPrinter::EmitUserSections(Module &M) {
482 EmitSectionList (M, PTOF->USERSections());
485 // Print all AUTO sections.
486 void PIC16AsmPrinter::EmitAllAutos(Module &M) {
487 EmitSectionList (M, PTOF->AUTOSections());
490 extern "C" void LLVMInitializePIC16AsmPrinter() {
491 RegisterAsmPrinter<PIC16AsmPrinter> X(ThePIC16Target);
494 // Emit one data section using correct section emitter based on section type.
495 void PIC16AsmPrinter::EmitSingleSection(const PIC16Section *S) {
496 if (S == NULL) return;
498 switch (S->getType()) {
499 default: llvm_unreachable ("unknow user section type");
503 EmitUninitializedDataSection(S);
507 EmitInitializedDataSection(S);
512 // Emit a list of sections.
513 void PIC16AsmPrinter::
514 EmitSectionList(Module &M, const std::vector<PIC16Section *> &SList) {
515 for (unsigned i = 0; i < SList.size(); i++) {
516 // Exclude llvm specific metadata sections.
517 if (SList[i]->getName().find("llvm.") != std::string::npos)
520 EmitSingleSection(SList[i]);