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"
27 #include "PIC16GenAsmWriter.inc"
28 bool PIC16AsmPrinter::inSameBank (char *s1, char *s2){
30 assert (s1 && s2 && "Null pointer assignment");
32 if ((*s1 == '.') && (*s2 == '.')) { //skip if they both start with '.'
40 if ((*s1 == '.') && (*s2 == '.')) //both symbols in same function
41 goto _InSameBank; //in the same bank
56 bool PIC16AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
57 std::string NewBankselLabel;
58 unsigned Operands = MI->getNumOperands();
60 // Global address or external symbol should be second operand from last
61 // if we want to print banksel for it.
62 const MachineOperand &Op = MI->getOperand(Operands-2);
63 unsigned OpType = Op.getType();
64 if (OpType == MachineOperand::MO_GlobalAddress ||
65 OpType == MachineOperand::MO_ExternalSymbol) {
66 if (OpType == MachineOperand::MO_GlobalAddress )
67 NewBankselLabel = Mang->getValueName(Op.getGlobal());
69 NewBankselLabel = Op.getSymbolName();
71 // Operand after global address or external symbol should be banksel.
72 // Value 1 for this operand means we need to generate banksel else do not
74 const MachineOperand &BS = MI->getOperand(Operands-1);
75 if (((int)BS.getImm() == 1) &&
76 (!inSameBank ((char *)CurrentBankselLabelInBasicBlock.c_str(),
77 (char *)NewBankselLabel.c_str()))) {
78 CurrentBankselLabelInBasicBlock = NewBankselLabel;
80 printOperand(MI, Operands-2);
89 /// runOnMachineFunction - This uses the printInstruction()
90 /// method to print assembly for each instruction.
92 bool PIC16AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
95 // This calls the base class function required to be called at beginning
96 // of runOnMachineFunction.
97 SetupMachineFunction(MF);
99 // Get the mangled name.
100 const Function *F = MF.getFunction();
101 CurrentFnName = Mang->getValueName(F);
103 // Emit the function variables.
104 emitFunctionData(MF);
105 std::string codeSection;
106 codeSection = "code." + CurrentFnName + ".# " + "CODE";
107 const Section *fCodeSection = TAI->getNamedSection(codeSection.c_str(),
110 SwitchToSection (fCodeSection);
112 // Print out code for the function.
113 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
115 // Print a label for the basic block.
116 if (I != MF.begin()) {
117 printBasicBlockLabel(I, true);
121 O << CurrentFnName << ":\n";
122 CurrentBankselLabelInBasicBlock = "";
123 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
125 // Print the assembly for the instruction.
126 printMachineInstruction(II);
129 return false; // we didn't modify anything.
132 /// createPIC16CodePrinterPass - Returns a pass that prints the PIC16
133 /// assembly code for a MachineFunction to the given output stream,
134 /// using the given target machine description. This should work
135 /// regardless of whether the function is in SSA form.
137 FunctionPass *llvm::createPIC16CodePrinterPass(raw_ostream &o,
138 PIC16TargetMachine &tm,
140 return new PIC16AsmPrinter(o, tm, tm.getTargetAsmInfo(), fast);
143 void PIC16AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
144 const MachineOperand &MO = MI->getOperand(opNum);
146 switch (MO.getType()) {
147 case MachineOperand::MO_Register:
148 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
149 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
151 assert(0 && "not implemented");
154 case MachineOperand::MO_Immediate:
155 O << (int)MO.getImm();
158 case MachineOperand::MO_GlobalAddress:
159 O << Mang->getValueName(MO.getGlobal());
162 case MachineOperand::MO_ExternalSymbol:
163 O << MO.getSymbolName();
166 case MachineOperand::MO_MachineBasicBlock:
167 printBasicBlockLabel(MO.getMBB());
171 assert(0 && " Operand type not supported.");
175 void PIC16AsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
176 int CC = (int)MI->getOperand(opNum).getImm();
177 O << PIC16CondCodeToString((PIC16CC::CondCodes)CC);
181 bool PIC16AsmPrinter::doInitialization (Module &M) {
182 bool Result = AsmPrinter::doInitialization(M);
183 // FIXME:: This is temporary solution to generate the include file.
184 // The processor should be passed to llc as in input and the header file
185 // should be generated accordingly.
186 O << "\t#include P16F1937.INC\n";
187 EmitExternsAndGlobals (M);
194 void PIC16AsmPrinter::EmitExternsAndGlobals (Module &M) {
195 // Emit declarations for external functions.
196 O << "section.0" <<"\n";
197 for (Module::iterator I = M.begin(), E = M.end(); I != E; I++) {
198 std::string Name = Mang->getValueName(I);
199 if (Name.compare("abort") == 0)
201 if (I->isDeclaration()) {
202 O << "\textern " <<Name << "\n";
203 O << "\textern " << Name << ".retval\n";
204 O << "\textern " << Name << ".args\n";
206 else if (I->hasExternalLinkage()) {
207 O << "\tglobal " << Name << "\n";
208 O << "\tglobal " << Name << ".retval\n";
209 O << "\tglobal " << Name << ".args\n";
213 // Emit header file to include declaration of library functions
214 O << "\t#include C16IntrinsicCalls.INC\n";
216 // Emit declarations for external globals.
217 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
219 // Any variables reaching here with ".auto." in its name is a local scope
220 // variable and should not be printed in global data section.
221 std::string Name = Mang->getValueName(I);
222 if (Name.find(".auto.") != std::string::npos)
225 if (I->isDeclaration())
226 O << "\textern "<< Name << "\n";
227 else if (I->hasCommonLinkage() || I->hasExternalLinkage())
228 O << "\tglobal "<< Name << "\n";
232 void PIC16AsmPrinter::EmitInitData (Module &M) {
233 SwitchToSection(TAI->getDataSection());
234 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
236 if (!I->hasInitializer()) // External global require no code.
239 Constant *C = I->getInitializer();
240 const PointerType *PtrTy = I->getType();
241 int AddrSpace = PtrTy->getAddressSpace();
243 if ((!C->isNullValue()) && (AddrSpace == PIC16ISD::RAM_SPACE)) {
245 if (EmitSpecialLLVMGlobal(I))
248 // Any variables reaching here with "." in its name is a local scope
249 // variable and should not be printed in global data section.
250 std::string name = Mang->getValueName(I);
251 if (name.find(".auto.") != std::string::npos)
255 EmitGlobalConstant(C, AddrSpace);
260 void PIC16AsmPrinter::EmitRomData (Module &M)
262 SwitchToSection(TAI->getReadOnlySection());
264 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
266 if (!I->hasInitializer()) // External global require no code.
269 Constant *C = I->getInitializer();
270 const PointerType *PtrTy = I->getType();
271 int AddrSpace = PtrTy->getAddressSpace();
272 if ((!C->isNullValue()) && (AddrSpace == PIC16ISD::ROM_SPACE)) {
274 if (EmitSpecialLLVMGlobal(I))
277 // Any variables reaching here with "." in its name is a local scope
278 // variable and should not be printed in global data section.
279 std::string name = Mang->getValueName(I);
280 if (name.find(".") != std::string::npos)
284 EmitGlobalConstant(C, AddrSpace);
291 void PIC16AsmPrinter::EmitUnInitData (Module &M)
293 SwitchToSection(TAI->getBSSSection_());
294 const TargetData *TD = TM.getTargetData();
296 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
298 if (!I->hasInitializer()) // External global require no code.
301 Constant *C = I->getInitializer();
302 if (C->isNullValue()) {
304 if (EmitSpecialLLVMGlobal(I))
307 // Any variables reaching here with "." in its name is a local scope
308 // variable and should not be printed in global data section.
309 std::string name = Mang->getValueName(I);
310 if (name.find(".") != std::string::npos)
313 const Type *Ty = C->getType();
314 unsigned Size = TD->getTypePaddedSize(Ty);
316 O << name << " " <<"RES"<< " " << Size ;
322 bool PIC16AsmPrinter::doFinalization(Module &M) {
323 O << "\t" << "END\n";
324 bool Result = AsmPrinter::doFinalization(M);
328 void PIC16AsmPrinter::emitFunctionData(MachineFunction &MF) {
329 const Function *F = MF.getFunction();
330 std::string FuncName = Mang->getValueName(F);
331 const Module *M = F->getParent();
332 const TargetData *TD = TM.getTargetData();
333 unsigned FrameSize = 0;
334 // Emit the data section name.
336 std::string SectionName = "fdata." + CurrentFnName + ".# " + "UDATA";
338 const Section *fDataSection = TAI->getNamedSection(SectionName.c_str(),
339 SectionFlags::Writeable);
340 SwitchToSection(fDataSection);
342 //Emit function return value.
343 O << CurrentFnName << ".retval:\n";
344 const Type *RetType = F->getReturnType();
345 unsigned RetSize = 0;
346 if (RetType->getTypeID() != Type::VoidTyID)
347 RetSize = TD->getTypePaddedSize(RetType);
349 // Emit function arguments.
350 O << CurrentFnName << ".args:\n";
351 // Emit the function variables.
353 // In PIC16 all the function arguments and local variables are global.
354 // Therefore to get the variable belonging to this function entire
355 // global list will be traversed and variables belonging to this function
356 // will be emitted in the current data section.
357 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
359 std::string VarName = Mang->getValueName(I);
361 // The variables of a function are of form FuncName.* . If this variable
362 // does not belong to this function then continue.
363 // Static local varilabes of a function does not have .auto. in their
364 // name. They are not printed as part of function data but module
365 // level global data.
366 if (!(VarName.find(FuncName + ".auto.") == 0 ? true : false))
369 Constant *C = I->getInitializer();
370 const Type *Ty = C->getType();
371 unsigned Size = TD->getTypePaddedSize(Ty);
373 // Emit memory reserve directive.
374 O << VarName << " RES " << Size << "\n";
377 // Return value can not overlap with temp data, becasue a temp slot
378 // may be read/written after a return value is calculated and saved
379 // within the function.
380 if (RetSize > FrameSize)
381 O << CurrentFnName << ".dummy" << " RES " << (RetSize - FrameSize) << "\n";
383 emitFunctionTempData(MF, FrameSize);
386 void PIC16AsmPrinter::emitFunctionTempData(MachineFunction &MF,
387 unsigned &FrameSize) {
388 // Emit temporary variables.
389 MachineFrameInfo *FrameInfo = MF.getFrameInfo();
390 if (FrameInfo->hasStackObjects()) {
391 int indexBegin = FrameInfo->getObjectIndexBegin();
392 int indexEnd = FrameInfo->getObjectIndexEnd();
394 if (indexBegin < indexEnd) {
395 FrameSize += indexEnd - indexBegin;
396 O << CurrentFnName << ".tmp RES"<< " "
397 <<indexEnd - indexBegin <<"\n";
400 while (indexBegin < indexEnd) {
401 O << CurrentFnName << "_tmp_" << indexBegin << " " << "RES"<< " "