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 "PIC16AsmPrinter.h"
16 #include "PIC16TargetAsmInfo.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/Function.h"
19 #include "llvm/Module.h"
20 #include "llvm/CodeGen/DwarfWriter.h"
21 #include "llvm/CodeGen/MachineFrameInfo.h"
22 #include "llvm/Support/raw_ostream.h"
23 #include "llvm/Support/Mangler.h"
24 #include "llvm/CodeGen/DwarfWriter.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
29 #include "PIC16GenAsmWriter.inc"
31 bool PIC16AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
36 /// runOnMachineFunction - This emits the frame section, autos section and
37 /// assembly for each instruction. Also takes care of function begin debug
38 /// directive and file begin debug directive (if required) for the function.
40 bool PIC16AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
43 // This calls the base class function required to be called at beginning
44 // of runOnMachineFunction.
45 SetupMachineFunction(MF);
47 // Get the mangled name.
48 const Function *F = MF.getFunction();
49 CurrentFnName = Mang->getValueName(F);
51 // Emit .file directive.
52 DbgInfo.EmitFileDirective(F);
54 // Emit the function frame (args and temps).
55 EmitFunctionFrame(MF);
57 // Emit function begin debug directive.
58 DbgInfo.EmitFunctBeginDI(F);
60 // Emit the autos section of function.
61 EmitAutos(CurrentFnName);
63 // Now emit the instructions of function in its code section.
64 const char *codeSection = PAN::getCodeSectionName(CurrentFnName).c_str();
66 const Section *fCodeSection = TAI->getNamedSection(codeSection,
68 // Start the Code Section.
70 SwitchToSection (fCodeSection);
72 // Emit the frame address of the function at the beginning of code.
73 O << "\tretlw low(" << PAN::getFrameLabel(CurrentFnName) << ")\n";
74 O << "\tretlw high(" << PAN::getFrameLabel(CurrentFnName) << ")\n";
76 // Emit function start label.
77 O << CurrentFnName << ":\n";
79 // For emitting line directives, we need to keep track of the current
80 // source line. When it changes then only emit the line directive.
83 // Print out code for the function.
84 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
87 // Print a label for the basic block.
88 if (I != MF.begin()) {
89 printBasicBlockLabel(I, true);
93 // Print a basic block.
94 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
97 // Emit the line directive if source line changed.
98 const DebugLoc DL = II->getDebugLoc();
99 if (!DL.isUnknown()) {
100 unsigned line = MF.getDebugLocTuple(DL).Line;
101 if (line != CurLine) {
102 O << "\t.line " << line << "\n";
107 // Print the assembly for the instruction.
108 printMachineInstruction(II);
112 // Emit function end debug directives.
113 DbgInfo.EmitFunctEndDI(F, CurLine);
115 return false; // we didn't modify anything.
118 /// createPIC16CodePrinterPass - Returns a pass that prints the PIC16
119 /// assembly code for a MachineFunction to the given output stream,
120 /// using the given target machine description. This should work
121 /// regardless of whether the function is in SSA form.
123 FunctionPass *llvm::createPIC16CodePrinterPass(raw_ostream &o,
124 PIC16TargetMachine &tm,
125 CodeGenOpt::Level OptLevel,
127 return new PIC16AsmPrinter(o, tm, tm.getTargetAsmInfo(), OptLevel, verbose);
131 // printOperand - print operand of insn.
132 void PIC16AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
133 const MachineOperand &MO = MI->getOperand(opNum);
135 switch (MO.getType()) {
136 case MachineOperand::MO_Register:
137 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
138 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
140 assert(0 && "not implemented");
143 case MachineOperand::MO_Immediate:
144 O << (int)MO.getImm();
147 case MachineOperand::MO_GlobalAddress: {
148 O << Mang->getValueName(MO.getGlobal());
151 case MachineOperand::MO_ExternalSymbol: {
152 const char *Sname = MO.getSymbolName();
154 // If its a libcall name, record it to decls section.
155 if (PAN::getSymbolTag(Sname) == PAN::LIBCALL) {
156 LibcallDecls.push_back(Sname);
162 case MachineOperand::MO_MachineBasicBlock:
163 printBasicBlockLabel(MO.getMBB());
167 assert(0 && " Operand type not supported.");
171 void PIC16AsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
172 int CC = (int)MI->getOperand(opNum).getImm();
173 O << PIC16CondCodeToString((PIC16CC::CondCodes)CC);
176 void PIC16AsmPrinter::printLibcallDecls(void) {
177 // If no libcalls used, return.
178 if (LibcallDecls.empty()) return;
180 O << TAI->getCommentString() << "External decls for libcalls - BEGIN." <<"\n";
181 // Remove duplicate entries.
183 LibcallDecls.unique();
184 for (std::list<const char*>::const_iterator I = LibcallDecls.begin();
185 I != LibcallDecls.end(); I++) {
186 O << TAI->getExternDirective() << *I << "\n";
187 O << TAI->getExternDirective() << PAN::getArgsLabel(*I) << "\n";
188 O << TAI->getExternDirective() << PAN::getRetvalLabel(*I) << "\n";
190 O << TAI->getCommentString() << "External decls for libcalls - END." <<"\n";
193 bool PIC16AsmPrinter::doInitialization (Module &M) {
194 bool Result = AsmPrinter::doInitialization(M);
196 // FIXME:: This is temporary solution to generate the include file.
197 // The processor should be passed to llc as in input and the header file
198 // should be generated accordingly.
199 O << "\n\t#include P16F1937.INC\n";
201 // Set the section names for all globals.
202 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
204 I->setSection(TAI->SectionForGlobal(I)->getName());
207 DbgInfo.EmitFileDirective(M);
208 EmitFunctionDecls(M);
209 EmitUndefinedVars(M);
214 DbgInfo.PopulateFunctsDI(M);
218 // Emit extern decls for functions imported from other modules, and emit
219 // global declarations for function defined in this module and which are
220 // available to other modules.
221 void PIC16AsmPrinter::EmitFunctionDecls (Module &M) {
222 // Emit declarations for external functions.
223 O << TAI->getCommentString() << "Function Declarations - BEGIN." <<"\n";
224 for (Module::iterator I = M.begin(), E = M.end(); I != E; I++) {
225 std::string Name = Mang->getValueName(I);
226 if (Name.compare("@abort") == 0)
229 // If it is llvm intrinsic call then don't emit
230 if (Name.find("llvm.") != std::string::npos)
233 if (! (I->isDeclaration() || I->hasExternalLinkage()))
236 const char *directive = I->isDeclaration() ? TAI->getExternDirective() :
237 TAI->getGlobalDirective();
239 O << directive << Name << "\n";
240 O << directive << PAN::getRetvalLabel(Name) << "\n";
241 O << directive << PAN::getArgsLabel(Name) << "\n";
244 O << TAI->getCommentString() << "Function Declarations - END." <<"\n";
247 // Emit variables imported from other Modules.
248 void PIC16AsmPrinter::EmitUndefinedVars (Module &M)
250 std::vector<const GlobalVariable*> Items = PTAI->ExternalVarDecls->Items;
251 if (! Items.size()) return;
253 O << "\n" << TAI->getCommentString() << "Imported Variables - BEGIN" << "\n";
254 for (unsigned j = 0; j < Items.size(); j++) {
255 O << TAI->getExternDirective() << Mang->getValueName(Items[j]) << "\n";
257 O << TAI->getCommentString() << "Imported Variables - END" << "\n";
260 // Emit variables defined in this module and are available to other modules.
261 void PIC16AsmPrinter::EmitDefinedVars (Module &M)
263 std::vector<const GlobalVariable*> Items = PTAI->ExternalVarDefs->Items;
264 if (! Items.size()) return;
266 O << "\n" << TAI->getCommentString() << "Exported Variables - BEGIN" << "\n";
267 for (unsigned j = 0; j < Items.size(); j++) {
268 O << TAI->getGlobalDirective() << Mang->getValueName(Items[j]) << "\n";
270 O << TAI->getCommentString() << "Exported Variables - END" << "\n";
273 // Emit initialized data placed in ROM.
274 void PIC16AsmPrinter::EmitRomData (Module &M)
277 std::vector<const GlobalVariable*> Items = PTAI->ROSection->Items;
278 if (! Items.size()) return;
280 // Print ROData ection.
282 SwitchToSection(PTAI->ROSection->S_);
283 for (unsigned j = 0; j < Items.size(); j++) {
284 O << Mang->getValueName(Items[j]);
285 Constant *C = Items[j]->getInitializer();
286 int AddrSpace = Items[j]->getType()->getAddressSpace();
287 EmitGlobalConstant(C, AddrSpace);
291 bool PIC16AsmPrinter::doFinalization(Module &M) {
293 EmitRemainingAutos();
294 DbgInfo.EmitVarDebugInfo(M);
296 O << "\n\t" << "END\n";
297 bool Result = AsmPrinter::doFinalization(M);
301 void PIC16AsmPrinter::EmitFunctionFrame(MachineFunction &MF) {
302 const Function *F = MF.getFunction();
303 std::string FuncName = Mang->getValueName(F);
304 const TargetData *TD = TM.getTargetData();
305 // Emit the data section name.
307 const char *SectionName = PAN::getFrameSectionName(CurrentFnName).c_str();
309 const Section *fPDataSection = TAI->getNamedSection(SectionName,
310 SectionFlags::Writeable);
311 SwitchToSection(fPDataSection);
313 // Emit function frame label
314 O << PAN::getFrameLabel(CurrentFnName) << ":\n";
316 const Type *RetType = F->getReturnType();
317 unsigned RetSize = 0;
318 if (RetType->getTypeID() != Type::VoidTyID)
319 RetSize = TD->getTypeAllocSize(RetType);
321 //Emit function return value space
322 // FIXME: Do not emit RetvalLable when retsize is zero. To do this
323 // we will need to avoid printing a global directive for Retval label
324 // in emitExternandGloblas.
326 O << PAN::getRetvalLabel(CurrentFnName) << " RES " << RetSize << "\n";
328 O << PAN::getRetvalLabel(CurrentFnName) << ": \n";
330 // Emit variable to hold the space for function arguments
331 unsigned ArgSize = 0;
332 for (Function::const_arg_iterator argi = F->arg_begin(),
333 arge = F->arg_end(); argi != arge ; ++argi) {
334 const Type *Ty = argi->getType();
335 ArgSize += TD->getTypeAllocSize(Ty);
338 O << PAN::getArgsLabel(CurrentFnName) << " RES " << ArgSize << "\n";
340 // Emit temporary space
341 int TempSize = PTLI->GetTmpSize();
343 O << PAN::getTempdataLabel(CurrentFnName) << " RES " << TempSize <<"\n";
346 void PIC16AsmPrinter::EmitIData (Module &M) {
348 // Print all IDATA sections.
349 std::vector <PIC16Section *>IDATASections = PTAI->IDATASections;
350 for (unsigned i = 0; i < IDATASections.size(); i++) {
352 SwitchToSection(IDATASections[i]->S_);
353 std::vector<const GlobalVariable*> Items = IDATASections[i]->Items;
354 for (unsigned j = 0; j < Items.size(); j++) {
355 std::string Name = Mang->getValueName(Items[j]);
356 Constant *C = Items[j]->getInitializer();
357 int AddrSpace = Items[j]->getType()->getAddressSpace();
359 EmitGlobalConstant(C, AddrSpace);
364 void PIC16AsmPrinter::EmitUData (Module &M) {
365 const TargetData *TD = TM.getTargetData();
367 // Print all BSS sections.
368 std::vector <PIC16Section *>BSSSections = PTAI->BSSSections;
369 for (unsigned i = 0; i < BSSSections.size(); i++) {
371 SwitchToSection(BSSSections[i]->S_);
372 std::vector<const GlobalVariable*> Items = BSSSections[i]->Items;
373 for (unsigned j = 0; j < Items.size(); j++) {
374 std::string Name = Mang->getValueName(Items[j]);
375 Constant *C = Items[j]->getInitializer();
376 const Type *Ty = C->getType();
377 unsigned Size = TD->getTypeAllocSize(Ty);
379 O << Name << " " <<"RES"<< " " << Size ;
385 void PIC16AsmPrinter::EmitAutos (std::string FunctName)
387 // Section names for all globals are already set.
389 const TargetData *TD = TM.getTargetData();
391 // Now print Autos section for this function.
392 std::string SectionName = PAN::getAutosSectionName(FunctName);
393 std::vector <PIC16Section *>AutosSections = PTAI->AutosSections;
394 for (unsigned i = 0; i < AutosSections.size(); i++) {
396 if (AutosSections[i]->S_->getName() == SectionName) {
397 // Set the printing status to true
398 AutosSections[i]->setPrintedStatus(true);
399 SwitchToSection(AutosSections[i]->S_);
400 std::vector<const GlobalVariable*> Items = AutosSections[i]->Items;
401 for (unsigned j = 0; j < Items.size(); j++) {
402 std::string VarName = Mang->getValueName(Items[j]);
403 Constant *C = Items[j]->getInitializer();
404 const Type *Ty = C->getType();
405 unsigned Size = TD->getTypeAllocSize(Ty);
406 // Emit memory reserve directive.
407 O << VarName << " RES " << Size << "\n";
414 // Print autos that were not printed during the code printing of functions.
415 // As the functions might themselves would have got deleted by the optimizer.
416 void PIC16AsmPrinter::EmitRemainingAutos()
418 const TargetData *TD = TM.getTargetData();
420 // Now print Autos section for this function.
421 std::vector <PIC16Section *>AutosSections = PTAI->AutosSections;
422 for (unsigned i = 0; i < AutosSections.size(); i++) {
424 // if the section is already printed then don't print again
425 if (AutosSections[i]->isPrinted())
428 // Set status as printed
429 AutosSections[i]->setPrintedStatus(true);
432 SwitchToSection(AutosSections[i]->S_);
433 std::vector<const GlobalVariable*> Items = AutosSections[i]->Items;
434 for (unsigned j = 0; j < Items.size(); j++) {
435 std::string VarName = Mang->getValueName(Items[j]);
436 Constant *C = Items[j]->getInitializer();
437 const Type *Ty = C->getType();
438 unsigned Size = TD->getTypeAllocSize(Ty);
439 // Emit memory reserve directive.
440 O << VarName << " RES " << Size << "\n";