1 //===-- PIC16DebugInfo.cpp - Implementation for PIC16 Debug Information ======//
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 the helper functions for representing debug information.
12 //===----------------------------------------------------------------------===//
15 #include "PIC16DebugInfo.h"
16 #include "llvm/GlobalVariable.h"
17 #include "llvm/CodeGen/MachineFunction.h"
18 #include "llvm/Support/DebugLoc.h"
19 #include "llvm/Support/raw_ostream.h"
23 /// PopulateDebugInfo - Populate the TypeNo, Aux[] and TagName from Ty.
25 void PIC16DbgInfo::PopulateDebugInfo (DIType Ty, unsigned short &TypeNo,
26 bool &HasAux, int Aux[],
27 std::string &TagName) {
28 if (Ty.isBasicType(Ty.getTag()))
29 PopulateBasicTypeInfo (Ty, TypeNo);
30 else if (Ty.isDerivedType(Ty.getTag()))
31 PopulateDerivedTypeInfo (Ty, TypeNo, HasAux, Aux, TagName);
32 else if (Ty.isCompositeType(Ty.getTag()))
33 PopulateCompositeTypeInfo (Ty, TypeNo, HasAux, Aux, TagName);
35 TypeNo = PIC16Dbg::T_NULL;
41 /// PopulateBasicTypeInfo- Populate TypeNo for basic type from Ty.
43 void PIC16DbgInfo::PopulateBasicTypeInfo (DIType Ty, unsigned short &TypeNo) {
44 std::string Name = "";
46 unsigned short BaseTy = GetTypeDebugNumber(Name);
47 TypeNo = TypeNo << PIC16Dbg::S_BASIC;
48 TypeNo = TypeNo | (0xffff & BaseTy);
51 /// PopulateDerivedTypeInfo - Populate TypeNo, Aux[], TagName for derived type
52 /// from Ty. Derived types are mostly pointers.
54 void PIC16DbgInfo::PopulateDerivedTypeInfo (DIType Ty, unsigned short &TypeNo,
55 bool &HasAux, int Aux[],
56 std::string &TagName) {
60 case dwarf::DW_TAG_pointer_type:
61 TypeNo = TypeNo << PIC16Dbg::S_DERIVED;
62 TypeNo = TypeNo | PIC16Dbg::DT_PTR;
65 TypeNo = TypeNo << PIC16Dbg::S_DERIVED;
68 // We also need to encode the the information about the base type of
70 DIType BaseType = DIDerivedType(Ty.getGV()).getTypeDerivedFrom();
71 PopulateDebugInfo(BaseType, TypeNo, HasAux, Aux, TagName);
74 /// PopulateArrayTypeInfo - Populate TypeNo, Aux[] for array from Ty.
75 void PIC16DbgInfo::PopulateArrayTypeInfo (DIType Ty, unsigned short &TypeNo,
76 bool &HasAux, int Aux[],
77 std::string &TagName) {
79 DICompositeType CTy = DICompositeType(Ty.getGV());
80 DIArray Elements = CTy.getTypeArray();
81 unsigned short size = 1;
82 unsigned short Dimension[4]={0,0,0,0};
83 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
84 DIDescriptor Element = Elements.getElement(i);
85 if (Element.getTag() == dwarf::DW_TAG_subrange_type) {
86 TypeNo = TypeNo << PIC16Dbg::S_DERIVED;
87 TypeNo = TypeNo | PIC16Dbg::DT_ARY;
88 DISubrange SubRange = DISubrange(Element.getGV());
89 Dimension[i] = SubRange.getHi() - SubRange.getLo() + 1;
90 // Each dimension is represented by 2 bytes starting at byte 9.
91 Aux[8+i*2+0] = Dimension[i];
92 Aux[8+i*2+1] = Dimension[i] >> 8;
93 size = size * Dimension[i];
97 // In auxillary entry for array, 7th and 8th byte represent array size.
100 DIType BaseType = CTy.getTypeDerivedFrom();
101 PopulateDebugInfo(BaseType, TypeNo, HasAux, Aux, TagName);
104 /// PopulateStructOrUnionTypeInfo - Populate TypeNo, Aux[] , TagName for
105 /// structure or union.
107 void PIC16DbgInfo::PopulateStructOrUnionTypeInfo (DIType Ty,
108 unsigned short &TypeNo,
109 bool &HasAux, int Aux[],
110 std::string &TagName) {
111 DICompositeType CTy = DICompositeType(Ty.getGV());
112 TypeNo = TypeNo << PIC16Dbg::S_BASIC;
113 if (Ty.getTag() == dwarf::DW_TAG_structure_type)
114 TypeNo = TypeNo | PIC16Dbg::T_STRUCT;
116 TypeNo = TypeNo | PIC16Dbg::T_UNION;
117 CTy.getName(TagName);
118 // UniqueSuffix is .number where number is obtained from
119 // llvm.dbg.composite<number>.
120 std::string UniqueSuffix = "." + Ty.getGV()->getName().substr(18);
121 TagName += UniqueSuffix;
122 unsigned short size = CTy.getSizeInBits()/8;
123 // 7th and 8th byte represent size.
125 Aux[6] = size & 0xff;
129 /// PopulateEnumTypeInfo - Populate TypeNo for enum from Ty.
130 void PIC16DbgInfo::PopulateEnumTypeInfo (DIType Ty, unsigned short &TypeNo) {
131 TypeNo = TypeNo << PIC16Dbg::S_BASIC;
132 TypeNo = TypeNo | PIC16Dbg::T_ENUM;
135 /// PopulateCompositeTypeInfo - Populate TypeNo, Aux[] and TagName for
136 /// composite types from Ty.
138 void PIC16DbgInfo::PopulateCompositeTypeInfo (DIType Ty, unsigned short &TypeNo,
139 bool &HasAux, int Aux[],
140 std::string &TagName) {
141 switch (Ty.getTag()) {
142 case dwarf::DW_TAG_array_type: {
143 PopulateArrayTypeInfo (Ty, TypeNo, HasAux, Aux, TagName);
146 case dwarf:: DW_TAG_union_type:
147 case dwarf::DW_TAG_structure_type: {
148 PopulateStructOrUnionTypeInfo (Ty, TypeNo, HasAux, Aux, TagName);
151 case dwarf::DW_TAG_enumeration_type: {
152 PopulateEnumTypeInfo (Ty, TypeNo);
156 TypeNo = TypeNo << PIC16Dbg::S_DERIVED;
160 /// GetTypeDebugNumber - Get debug type number for given type.
162 unsigned PIC16DbgInfo::GetTypeDebugNumber(std::string &type) {
164 return PIC16Dbg::T_CHAR;
165 else if (type == "short")
166 return PIC16Dbg::T_SHORT;
167 else if (type == "int")
168 return PIC16Dbg::T_INT;
169 else if (type == "long")
170 return PIC16Dbg::T_LONG;
171 else if (type == "unsigned char")
172 return PIC16Dbg::T_UCHAR;
173 else if (type == "unsigned short")
174 return PIC16Dbg::T_USHORT;
175 else if (type == "unsigned int")
176 return PIC16Dbg::T_UINT;
177 else if (type == "unsigned long")
178 return PIC16Dbg::T_ULONG;
183 /// GetStorageClass - Get storage class for give debug variable.
185 short PIC16DbgInfo::getStorageClass(DIGlobalVariable DIGV) {
187 if (PAN::isLocalName(DIGV.getGlobal()->getName())) {
188 // Generating C_AUTO here fails due to error in linker. Change it once
190 ClassNo = PIC16Dbg::C_STAT;
192 else if (DIGV.isLocalToUnit())
193 ClassNo = PIC16Dbg::C_STAT;
195 ClassNo = PIC16Dbg::C_EXT;
199 /// BeginModule - Emit necessary debug info to start a Module and do other
200 /// required initializations.
201 void PIC16DbgInfo::BeginModule(Module &M) {
202 // Emit file directive for module.
203 // FIXME : What if more then one CUs are present in a module ?
204 GlobalVariable *CU = M.getNamedGlobal("llvm.dbg.compile_unit");
206 EmitDebugDirectives = true;
210 // Emit debug info for decls of composite types.
211 EmitCompositeTypeDecls(M);
214 /// Helper to find first valid debug loc for a function.
216 static const DebugLoc GetDebugLocForFunction(const MachineFunction &MF) {
218 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
220 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
222 DL = II->getDebugLoc();
230 /// BeginFunction - Emit necessary debug info to start a function.
232 void PIC16DbgInfo::BeginFunction(const MachineFunction &MF) {
233 if (! EmitDebugDirectives) return;
235 // Retreive the first valid debug Loc and process it.
236 const DebugLoc &DL = GetDebugLocForFunction(MF);
237 ChangeDebugLoc(MF, DL, true);
239 EmitFunctBeginDI(MF.getFunction());
241 // Set current line to 0 so that.line directive is genearted after .bf.
245 /// ChangeDebugLoc - Take necessary steps when DebugLoc changes.
246 /// CurFile and CurLine may change as a result of this.
248 void PIC16DbgInfo::ChangeDebugLoc(const MachineFunction &MF,
249 const DebugLoc &DL, bool IsInBeginFunction) {
250 if (! EmitDebugDirectives) return;
251 assert (! DL.isUnknown() && "can't change to invalid debug loc");
253 GlobalVariable *CU = MF.getDebugLocTuple(DL).CompileUnit;
254 unsigned line = MF.getDebugLocTuple(DL).Line;
257 SwitchToLine(line, IsInBeginFunction);
260 /// SwitchToLine - Emit line directive for a new line.
262 void PIC16DbgInfo::SwitchToLine(unsigned Line, bool IsInBeginFunction) {
263 if (CurLine == Line) return;
264 if (!IsInBeginFunction) O << "\n\t.line " << Line << "\n";
268 /// EndFunction - Emit .ef for end of function.
270 void PIC16DbgInfo::EndFunction(const MachineFunction &MF) {
271 if (! EmitDebugDirectives) return;
272 EmitFunctEndDI(MF.getFunction(), CurLine);
275 /// EndModule - Emit .eof for end of module.
277 void PIC16DbgInfo::EndModule(Module &M) {
278 if (! EmitDebugDirectives) return;
280 if (CurFile != "") O << "\n\t.eof";
283 /// EmitCompositeTypeElements - Emit debug information for members of a
286 void PIC16DbgInfo::EmitCompositeTypeElements (DICompositeType CTy,
287 std::string UniqueSuffix) {
288 unsigned long Value = 0;
289 DIArray Elements = CTy.getTypeArray();
290 for (unsigned i = 0, N = Elements.getNumElements(); i < N; i++) {
291 DIDescriptor Element = Elements.getElement(i);
292 unsigned short TypeNo = 0;
294 int ElementAux[PIC16Dbg::AuxSize] = { 0 };
295 std::string TagName = "";
296 std::string ElementName;
297 GlobalVariable *GV = Element.getGV();
298 DIDerivedType DITy(GV);
299 DITy.getName(ElementName);
300 unsigned short ElementSize = DITy.getSizeInBits()/8;
301 // Get mangleddd name for this structure/union element.
302 std::string MangMemName = ElementName + UniqueSuffix;
303 PopulateDebugInfo(DITy, TypeNo, HasAux, ElementAux, TagName);
305 if( CTy.getTag() == dwarf::DW_TAG_union_type)
306 Class = PIC16Dbg::C_MOU;
307 else if (CTy.getTag() == dwarf::DW_TAG_structure_type)
308 Class = PIC16Dbg::C_MOS;
309 EmitSymbol(MangMemName, Class, TypeNo, Value);
310 if (CTy.getTag() == dwarf::DW_TAG_structure_type)
311 Value += ElementSize;
313 EmitAuxEntry(MangMemName, ElementAux, PIC16Dbg::AuxSize, TagName);
317 /// EmitCompositeTypeDecls - Emit composite type declarations like structure
318 /// and union declarations.
320 void PIC16DbgInfo::EmitCompositeTypeDecls(Module &M) {
321 for(iplist<GlobalVariable>::iterator I = M.getGlobalList().begin(),
322 E = M.getGlobalList().end(); I != E; I++) {
323 // Structures and union declaration's debug info has llvm.dbg.composite
325 // FIXME: Checking and relying on llvm.dbg.composite name is not a good idea.
326 if(I->getName().find("llvm.dbg.composite") != std::string::npos) {
327 GlobalVariable *GV = cast<GlobalVariable >(I);
328 DICompositeType CTy(GV);
329 if (CTy.getTag() == dwarf::DW_TAG_union_type ||
330 CTy.getTag() == dwarf::DW_TAG_structure_type ) {
333 std::string DIVar = I->getName();
334 // Get the number after llvm.dbg.composite and make UniqueSuffix from
336 std::string UniqueSuffix = "." + DIVar.substr(18);
337 std::string MangledCTyName = name + UniqueSuffix;
338 unsigned short size = CTy.getSizeInBits()/8;
339 int Aux[PIC16Dbg::AuxSize] = {0};
340 // 7th and 8th byte represent size of structure/union.
341 Aux[6] = size & 0xff;
343 // Emit .def for structure/union tag.
344 if( CTy.getTag() == dwarf::DW_TAG_union_type)
345 EmitSymbol(MangledCTyName, PIC16Dbg::C_UNTAG);
346 else if (CTy.getTag() == dwarf::DW_TAG_structure_type)
347 EmitSymbol(MangledCTyName, PIC16Dbg::C_STRTAG);
349 // Emit auxiliary debug information for structure/union tag.
350 EmitAuxEntry(MangledCTyName, Aux, PIC16Dbg::AuxSize);
353 EmitCompositeTypeElements (CTy, UniqueSuffix);
355 // Emit mangled Symbol for end of structure/union.
356 std::string EOSSymbol = ".eos" + UniqueSuffix;
357 EmitSymbol(EOSSymbol, PIC16Dbg::C_EOS);
358 EmitAuxEntry(EOSSymbol, Aux, PIC16Dbg::AuxSize, MangledCTyName);
364 /// EmitFunctBeginDI - Emit .bf for function.
366 void PIC16DbgInfo::EmitFunctBeginDI(const Function *F) {
367 std::string FunctName = F->getName();
368 if (EmitDebugDirectives) {
369 std::string FunctBeginSym = ".bf." + FunctName;
370 std::string BlockBeginSym = ".bb." + FunctName;
372 int BFAux[PIC16Dbg::AuxSize] = {0};
374 BFAux[5] = CurLine >> 8;
376 // Emit debug directives for beginning of function.
377 EmitSymbol(FunctBeginSym, PIC16Dbg::C_FCN);
378 EmitAuxEntry(FunctBeginSym, BFAux, PIC16Dbg::AuxSize);
380 EmitSymbol(BlockBeginSym, PIC16Dbg::C_BLOCK);
381 EmitAuxEntry(BlockBeginSym, BFAux, PIC16Dbg::AuxSize);
385 /// EmitFunctEndDI - Emit .ef for function end.
387 void PIC16DbgInfo::EmitFunctEndDI(const Function *F, unsigned Line) {
388 std::string FunctName = F->getName();
389 if (EmitDebugDirectives) {
390 std::string FunctEndSym = ".ef." + FunctName;
391 std::string BlockEndSym = ".eb." + FunctName;
393 // Emit debug directives for end of function.
394 EmitSymbol(BlockEndSym, PIC16Dbg::C_BLOCK);
395 int EFAux[PIC16Dbg::AuxSize] = {0};
396 // 5th and 6th byte stand for line number.
398 EFAux[5] = CurLine >> 8;
399 EmitAuxEntry(BlockEndSym, EFAux, PIC16Dbg::AuxSize);
400 EmitSymbol(FunctEndSym, PIC16Dbg::C_FCN);
401 EmitAuxEntry(FunctEndSym, EFAux, PIC16Dbg::AuxSize);
405 /// EmitAuxEntry - Emit Auxiliary debug information.
407 void PIC16DbgInfo::EmitAuxEntry(const std::string VarName, int Aux[], int Num,
408 std::string TagName) {
409 O << "\n\t.dim " << VarName << ", 1" ;
410 // TagName is emitted in case of structure/union objects.
412 O << ", " << TagName;
413 for (int i = 0; i<Num; i++)
417 /// EmitSymbol - Emit .def for a symbol. Value is offset for the member.
419 void PIC16DbgInfo::EmitSymbol(std::string Name, short Class, unsigned short
420 Type, unsigned long Value) {
421 O << "\n\t" << ".def "<< Name << ", type = " << Type << ", class = "
424 O << ", value = " << Value;
427 /// EmitVarDebugInfo - Emit debug information for all variables.
429 void PIC16DbgInfo::EmitVarDebugInfo(Module &M) {
430 // FIXME : This anchor has been removed.
431 GlobalVariable *Root = M.getGlobalVariable("llvm.dbg.global_variables");
435 Constant *RootC = cast<Constant>(*Root->use_begin());
436 for (Value::use_iterator UI = RootC->use_begin(), UE = Root->use_end();
438 for (Value::use_iterator UUI = UI->use_begin(), UUE = UI->use_end();
440 DIGlobalVariable DIGV(cast<GlobalVariable>(*UUI));
441 DIType Ty = DIGV.getType();
442 unsigned short TypeNo = 0;
444 int Aux[PIC16Dbg::AuxSize] = { 0 };
445 std::string TagName = "";
446 std::string VarName = TAI->getGlobalPrefix()+DIGV.getGlobal()->getName();
447 PopulateDebugInfo(Ty, TypeNo, HasAux, Aux, TagName);
448 // Emit debug info only if type information is availaible.
449 if (TypeNo != PIC16Dbg::T_NULL) {
450 O << "\n\t.type " << VarName << ", " << TypeNo;
451 short ClassNo = getStorageClass(DIGV);
452 O << "\n\t.class " << VarName << ", " << ClassNo;
454 EmitAuxEntry(VarName, Aux, PIC16Dbg::AuxSize, TagName);
461 /// SwitchToCU - Switch to a new compilation unit.
463 void PIC16DbgInfo::SwitchToCU(GlobalVariable *CU) {
464 // Get the file path from CU.
465 DICompileUnit cu(CU);
466 std::string DirName, FileName;
467 std::string FilePath = cu.getDirectory(DirName) + "/" +
468 cu.getFilename(FileName);
470 // Nothing to do if source file is still same.
471 if ( FilePath == CurFile ) return;
473 // Else, close the current one and start a new.
474 if (CurFile != "") O << "\n\t.eof";
475 O << "\n\t.file\t\"" << FilePath << "\"\n" ;
480 /// EmitEOF - Emit .eof for end of file.
482 void PIC16DbgInfo::EmitEOF() {