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) {
93 // This calls the base class function required to be called at beginning
94 // of runOnMachineFunction.
95 SetupMachineFunction(MF);
97 // Get the mangled name.
98 const Function *F = MF.getFunction();
99 CurrentFnName = Mang->getValueName(F);
101 // Emit the function variables.
102 emitFunctionData(MF);
103 std::string codeSection;
104 codeSection = "code." + CurrentFnName + ".# " + "CODE";
105 const Section *fCodeSection = TAI->getNamedSection(codeSection.c_str(),
108 SwitchToSection (fCodeSection);
110 // Print out code for the function.
111 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
113 // Print a label for the basic block.
114 if (I != MF.begin()) {
115 printBasicBlockLabel(I, true);
119 O << CurrentFnName << ":\n";
120 CurrentBankselLabelInBasicBlock = "";
121 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
123 // Print the assembly for the instruction.
124 printMachineInstruction(II);
127 return false; // we didn't modify anything.
130 /// createPIC16CodePrinterPass - Returns a pass that prints the PIC16
131 /// assembly code for a MachineFunction to the given output stream,
132 /// using the given target machine description. This should work
133 /// regardless of whether the function is in SSA form.
135 FunctionPass *llvm::createPIC16CodePrinterPass(raw_ostream &o,
136 PIC16TargetMachine &tm) {
137 return new PIC16AsmPrinter(o, tm, tm.getTargetAsmInfo());
140 void PIC16AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
141 const MachineOperand &MO = MI->getOperand(opNum);
143 switch (MO.getType()) {
144 case MachineOperand::MO_Register:
145 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
146 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
148 assert(0 && "not implemented");
151 case MachineOperand::MO_Immediate:
152 O << (int)MO.getImm();
155 case MachineOperand::MO_GlobalAddress:
156 O << Mang->getValueName(MO.getGlobal());
159 case MachineOperand::MO_ExternalSymbol:
160 O << MO.getSymbolName();
163 case MachineOperand::MO_MachineBasicBlock:
164 printBasicBlockLabel(MO.getMBB());
168 assert(0 && " Operand type not supported.");
172 void PIC16AsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
173 int CC = (int)MI->getOperand(opNum).getImm();
174 O << PIC16CondCodeToString((PIC16CC::CondCodes)CC);
178 bool PIC16AsmPrinter::doInitialization (Module &M) {
179 bool Result = AsmPrinter::doInitialization(M);
180 // FIXME:: This is temporary solution to generate the include file.
181 // The processor should be passed to llc as in input and the header file
182 // should be generated accordingly.
183 O << "\t#include P16F1937.INC\n";
184 EmitExternsAndGlobals (M);
191 void PIC16AsmPrinter::EmitExternsAndGlobals (Module &M) {
192 // Emit declarations for external functions.
193 O << "section.0" <<"\n";
194 for (Module::iterator I = M.begin(), E = M.end(); I != E; I++) {
195 std::string Name = Mang->getValueName(I);
196 if (Name.compare("abort") == 0)
198 if (I->isDeclaration()) {
199 O << "\textern " <<Name << "\n";
200 O << "\textern " << Name << ".retval\n";
201 O << "\textern " << Name << ".args\n";
203 else if (I->hasExternalLinkage()) {
204 O << "\tglobal " << Name << "\n";
205 O << "\tglobal " << Name << ".retval\n";
206 O << "\tglobal " << Name << ".args\n";
210 // Emit header file to include declaration of library functions
211 O << "\t#include C16IntrinsicCalls.INC\n";
213 // Emit declarations for external globals.
214 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
216 // Any variables reaching here with ".auto." in its name is a local scope
217 // variable and should not be printed in global data section.
218 std::string Name = Mang->getValueName(I);
219 if (Name.find(".auto.") != std::string::npos)
222 if (I->isDeclaration())
223 O << "\textern "<< Name << "\n";
224 else if (I->hasCommonLinkage() || I->hasExternalLinkage())
225 O << "\tglobal "<< Name << "\n";
229 void PIC16AsmPrinter::EmitInitData (Module &M) {
230 SwitchToSection(TAI->getDataSection());
231 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
233 if (!I->hasInitializer()) // External global require no code.
236 Constant *C = I->getInitializer();
237 const PointerType *PtrTy = I->getType();
238 int AddrSpace = PtrTy->getAddressSpace();
240 if ((!C->isNullValue()) && (AddrSpace == PIC16ISD::RAM_SPACE)) {
242 if (EmitSpecialLLVMGlobal(I))
245 // Any variables reaching here with "." in its name is a local scope
246 // variable and should not be printed in global data section.
247 std::string name = Mang->getValueName(I);
248 if (name.find(".auto.") != std::string::npos)
252 EmitGlobalConstant(C, AddrSpace);
257 void PIC16AsmPrinter::EmitRomData (Module &M)
259 SwitchToSection(TAI->getReadOnlySection());
261 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
263 if (!I->hasInitializer()) // External global require no code.
266 Constant *C = I->getInitializer();
267 const PointerType *PtrTy = I->getType();
268 int AddrSpace = PtrTy->getAddressSpace();
269 if ((!C->isNullValue()) && (AddrSpace == PIC16ISD::ROM_SPACE)) {
271 if (EmitSpecialLLVMGlobal(I))
274 // Any variables reaching here with "." in its name is a local scope
275 // variable and should not be printed in global data section.
276 std::string name = Mang->getValueName(I);
277 if (name.find(".") != std::string::npos)
281 EmitGlobalConstant(C, AddrSpace);
288 void PIC16AsmPrinter::EmitUnInitData (Module &M)
290 SwitchToSection(TAI->getBSSSection_());
291 const TargetData *TD = TM.getTargetData();
293 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
295 if (!I->hasInitializer()) // External global require no code.
298 Constant *C = I->getInitializer();
299 if (C->isNullValue()) {
301 if (EmitSpecialLLVMGlobal(I))
304 // Any variables reaching here with "." in its name is a local scope
305 // variable and should not be printed in global data section.
306 std::string name = Mang->getValueName(I);
307 if (name.find(".") != std::string::npos)
310 const Type *Ty = C->getType();
311 unsigned Size = TD->getTypePaddedSize(Ty);
313 O << name << " " <<"RES"<< " " << Size ;
319 bool PIC16AsmPrinter::doFinalization(Module &M) {
320 O << "\t" << "END\n";
321 bool Result = AsmPrinter::doFinalization(M);
325 void PIC16AsmPrinter::emitFunctionData(MachineFunction &MF) {
326 const Function *F = MF.getFunction();
327 std::string FuncName = Mang->getValueName(F);
328 const Module *M = F->getParent();
329 const TargetData *TD = TM.getTargetData();
330 unsigned FrameSize = 0;
331 // Emit the data section name.
333 std::string SectionName = "fdata." + CurrentFnName + ".# " + "UDATA";
335 const Section *fDataSection = TAI->getNamedSection(SectionName.c_str(),
336 SectionFlags::Writeable);
337 SwitchToSection(fDataSection);
339 //Emit function return value.
340 O << CurrentFnName << ".retval:\n";
341 const Type *RetType = F->getReturnType();
342 unsigned RetSize = 0;
343 if (RetType->getTypeID() != Type::VoidTyID)
344 RetSize = TD->getTypePaddedSize(RetType);
346 // Emit function arguments.
347 O << CurrentFnName << ".args:\n";
348 // Emit the function variables.
350 // In PIC16 all the function arguments and local variables are global.
351 // Therefore to get the variable belonging to this function entire
352 // global list will be traversed and variables belonging to this function
353 // will be emitted in the current data section.
354 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
356 std::string VarName = Mang->getValueName(I);
358 // The variables of a function are of form FuncName.* . If this variable
359 // does not belong to this function then continue.
360 // Static local varilabes of a function does not have .auto. in their
361 // name. They are not printed as part of function data but module
362 // level global data.
363 if (!(VarName.find(FuncName + ".auto.") == 0 ? true : false))
366 Constant *C = I->getInitializer();
367 const Type *Ty = C->getType();
368 unsigned Size = TD->getTypePaddedSize(Ty);
370 // Emit memory reserve directive.
371 O << VarName << " RES " << Size << "\n";
374 // Return value can not overlap with temp data, becasue a temp slot
375 // may be read/written after a return value is calculated and saved
376 // within the function.
377 if (RetSize > FrameSize)
378 O << CurrentFnName << ".dummy" << " RES " << (RetSize - FrameSize) << "\n";
380 emitFunctionTempData(MF, FrameSize);
383 void PIC16AsmPrinter::emitFunctionTempData(MachineFunction &MF,
384 unsigned &FrameSize) {
385 // Emit temporary variables.
386 MachineFrameInfo *FrameInfo = MF.getFrameInfo();
387 if (FrameInfo->hasStackObjects()) {
388 int indexBegin = FrameInfo->getObjectIndexBegin();
389 int indexEnd = FrameInfo->getObjectIndexEnd();
391 if (indexBegin < indexEnd) {
392 FrameSize += indexEnd - indexBegin;
393 O << CurrentFnName << ".tmp RES"<< " "
394 <<indexEnd - indexBegin <<"\n";
397 while (indexBegin < indexEnd) {
398 O << CurrentFnName << "_tmp_" << indexBegin << " " << "RES"<< " "