lib/Target/PIC16/PIC16DebugInfo.cpp

   1
   2 //===-- PIC16DebugInfo.cpp - Implementation for PIC16 Debug Information ======//
   3 //
   4 //                     The LLVM Compiler Infrastructure
   5 //
   6 // This file is distributed under the University of Illinois Open Source
   7 // License. See LICENSE.TXT for details.
   8 //
   9 //===----------------------------------------------------------------------===//
  10 //
  11 // This file contains the helper functions for representing debug information.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "PIC16.h"
  16 #include "PIC16DebugInfo.h"
  17 #include "llvm/GlobalVariable.h"
  18 #include "llvm/CodeGen/MachineFunction.h"
  19 #include "llvm/MC/MCAsmInfo.h"
  20 #include "llvm/Support/DebugLoc.h"
  21 #include "llvm/Support/FormattedStream.h"
  22 #include "llvm/ADT/SmallString.h"
  23
  24 using namespace llvm;
  25
  26 /// PopulateDebugInfo - Populate the TypeNo, Aux[] and TagName from Ty.
  27 ///
  28 void PIC16DbgInfo::PopulateDebugInfo (DIType Ty, unsigned short &TypeNo,
  29                                       bool &HasAux, int Aux[],
  30                                       std::string &TagName) {
  31   if (Ty.isBasicType())
  32     PopulateBasicTypeInfo (Ty, TypeNo);
  33   else if (Ty.isDerivedType())
  34     PopulateDerivedTypeInfo (Ty, TypeNo, HasAux, Aux, TagName);
  35   else if (Ty.isCompositeType())
  36     PopulateCompositeTypeInfo (Ty, TypeNo, HasAux, Aux, TagName);
  37   else {
  38     TypeNo = PIC16Dbg::T_NULL;
  39     HasAux = false;
  40   }
  41   return;
  42 }
  43
  44 /// PopulateBasicTypeInfo- Populate TypeNo for basic type from Ty.
  45 ///
  46 void PIC16DbgInfo::PopulateBasicTypeInfo (DIType Ty, unsigned short &TypeNo) {
  47   std::string Name = "";
  48   Ty.getName(Name);
  49   unsigned short BaseTy = GetTypeDebugNumber(Name);
  50   TypeNo = TypeNo << PIC16Dbg::S_BASIC;
  51   TypeNo = TypeNo | (0xffff & BaseTy);
  52 }
  53
  54 /// PopulateDerivedTypeInfo - Populate TypeNo, Aux[], TagName for derived type
  55 /// from Ty. Derived types are mostly pointers.
  56 ///
  57 void PIC16DbgInfo::PopulateDerivedTypeInfo (DIType Ty, unsigned short &TypeNo,
  58                                             bool &HasAux, int Aux[],
  59                                             std::string &TagName) {
  60
  61   switch(Ty.getTag())
  62   {
  63     case dwarf::DW_TAG_pointer_type:
  64       TypeNo = TypeNo << PIC16Dbg::S_DERIVED;
  65       TypeNo = TypeNo | PIC16Dbg::DT_PTR;
  66       break;
  67     default:
  68       TypeNo = TypeNo << PIC16Dbg::S_DERIVED;
  69   }
  70
  71   // We also need to encode the the information about the base type of
  72   // pointer in TypeNo.
  73   DIType BaseType = DIDerivedType(Ty.getNode()).getTypeDerivedFrom();
  74   PopulateDebugInfo(BaseType, TypeNo, HasAux, Aux, TagName);
  75 }
  76
  77 /// PopulateArrayTypeInfo - Populate TypeNo, Aux[] for array from Ty.
  78 void PIC16DbgInfo::PopulateArrayTypeInfo (DIType Ty, unsigned short &TypeNo,
  79                                           bool &HasAux, int Aux[],
  80                                           std::string &TagName) {
  81
  82   DICompositeType CTy = DICompositeType(Ty.getNode());
  83   DIArray Elements = CTy.getTypeArray();
  84   unsigned short size = 1;
  85   unsigned short Dimension[4]={0,0,0,0};
  86   for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
  87     DIDescriptor Element = Elements.getElement(i);
  88     if (Element.getTag() == dwarf::DW_TAG_subrange_type) {
  89       TypeNo = TypeNo << PIC16Dbg::S_DERIVED;
  90       TypeNo = TypeNo | PIC16Dbg::DT_ARY;
  91       DISubrange SubRange = DISubrange(Element.getNode());
  92       Dimension[i] = SubRange.getHi() - SubRange.getLo() + 1;
  93       // Each dimension is represented by 2 bytes starting at byte 9.
  94       Aux[8+i*2+0] = Dimension[i];
  95       Aux[8+i*2+1] = Dimension[i] >> 8;
  96       size = size * Dimension[i];
  97     }
  98   }
  99   HasAux = true;
 100   // In auxillary entry for array, 7th and 8th byte represent array size.
 101   Aux[6] = size & 0xff;
 102   Aux[7] = size >> 8;
 103   DIType BaseType = CTy.getTypeDerivedFrom();
 104   PopulateDebugInfo(BaseType, TypeNo, HasAux, Aux, TagName);
 105 }
 106
 107 /// PopulateStructOrUnionTypeInfo - Populate TypeNo, Aux[] , TagName for
 108 /// structure or union.
 109 ///
 110 void PIC16DbgInfo::PopulateStructOrUnionTypeInfo (DIType Ty,
 111                                                   unsigned short &TypeNo,
 112                                                   bool &HasAux, int Aux[],
 113                                                   std::string &TagName) {
 114   DICompositeType CTy = DICompositeType(Ty.getNode());
 115   TypeNo = TypeNo << PIC16Dbg::S_BASIC;
 116   if (Ty.getTag() == dwarf::DW_TAG_structure_type)
 117     TypeNo = TypeNo | PIC16Dbg::T_STRUCT;
 118   else
 119     TypeNo = TypeNo | PIC16Dbg::T_UNION;
 120   CTy.getName(TagName);
 121   // UniqueSuffix is .number where number is obtained from
 122   // llvm.dbg.composite<number>.
 123   // FIXME: This will break when composite type is not represented by
 124   // llvm.dbg.composite* global variable. Since we need to revisit
 125   // PIC16DebugInfo implementation anyways after the MDNodes based
 126   // framework is done, let us continue with the way it is.
 127   std::string UniqueSuffix = "." + Ty.getNode()->getNameStr().substr(18);
 128   TagName += UniqueSuffix;
 129   unsigned short size = CTy.getSizeInBits()/8;
 130   // 7th and 8th byte represent size.
 131   HasAux = true;
 132   Aux[6] = size & 0xff;
 133   Aux[7] = size >> 8;
 134 }
 135
 136 /// PopulateEnumTypeInfo - Populate TypeNo for enum from Ty.
 137 void PIC16DbgInfo::PopulateEnumTypeInfo (DIType Ty, unsigned short &TypeNo) {
 138   TypeNo = TypeNo << PIC16Dbg::S_BASIC;
 139   TypeNo = TypeNo | PIC16Dbg::T_ENUM;
 140 }
 141
 142 /// PopulateCompositeTypeInfo - Populate TypeNo, Aux[] and TagName for
 143 /// composite types from Ty.
 144 ///
 145 void PIC16DbgInfo::PopulateCompositeTypeInfo (DIType Ty, unsigned short &TypeNo,
 146                                               bool &HasAux, int Aux[],
 147                                               std::string &TagName) {
 148   switch (Ty.getTag()) {
 149     case dwarf::DW_TAG_array_type: {
 150       PopulateArrayTypeInfo (Ty, TypeNo, HasAux, Aux, TagName);
 151       break;
 152     }
 153     case dwarf:: DW_TAG_union_type:
 154     case dwarf::DW_TAG_structure_type: {
 155       PopulateStructOrUnionTypeInfo (Ty, TypeNo, HasAux, Aux, TagName);
 156       break;
 157     }
 158     case dwarf::DW_TAG_enumeration_type: {
 159       PopulateEnumTypeInfo (Ty, TypeNo);
 160       break;
 161     }
 162     default:
 163       TypeNo = TypeNo << PIC16Dbg::S_DERIVED;
 164   }
 165 }
 166
 167 /// GetTypeDebugNumber - Get debug type number for given type.
 168 ///
 169 unsigned PIC16DbgInfo::GetTypeDebugNumber(std::string &type)  {
 170   if (type == "char")
 171     return PIC16Dbg::T_CHAR;
 172   else if (type == "short")
 173     return PIC16Dbg::T_SHORT;
 174   else if (type == "int")
 175     return PIC16Dbg::T_INT;
 176   else if (type == "long")
 177     return PIC16Dbg::T_LONG;
 178   else if (type == "unsigned char")
 179     return PIC16Dbg::T_UCHAR;
 180   else if (type == "unsigned short")
 181     return PIC16Dbg::T_USHORT;
 182   else if (type == "unsigned int")
 183     return PIC16Dbg::T_UINT;
 184   else if (type == "unsigned long")
 185     return PIC16Dbg::T_ULONG;
 186   else
 187     return 0;
 188 }
 189
 190 /// GetStorageClass - Get storage class for give debug variable.
 191 ///
 192 short PIC16DbgInfo::getStorageClass(DIGlobalVariable DIGV) {
 193   short ClassNo;
 194   if (PAN::isLocalName(DIGV.getGlobal()->getName())) {
 195     // Generating C_AUTO here fails due to error in linker. Change it once
 196     // linker is fixed.
 197     ClassNo = PIC16Dbg::C_STAT;
 198   }
 199   else if (DIGV.isLocalToUnit())
 200     ClassNo = PIC16Dbg::C_STAT;
 201   else
 202     ClassNo = PIC16Dbg::C_EXT;
 203   return ClassNo;
 204 }
 205
 206 /// BeginModule - Emit necessary debug info to start a Module and do other
 207 /// required initializations.
 208 void PIC16DbgInfo::BeginModule(Module &M) {
 209   // Emit file directive for module.
 210   DebugInfoFinder DbgFinder;
 211   DbgFinder.processModule(M);
 212   if (DbgFinder.compile_unit_count() != 0) {
 213     // FIXME : What if more then one CUs are present in a module ?
 214     MDNode *CU = *DbgFinder.compile_unit_begin();
 215     EmitDebugDirectives = true;
 216     SwitchToCU(CU);
 217   }
 218   // Emit debug info for decls of composite types.
 219   EmitCompositeTypeDecls(M);
 220 }
 221
 222 /// Helper to find first valid debug loc for a function.
 223 ///
 224 static const DebugLoc GetDebugLocForFunction(const MachineFunction &MF) {
 225   DebugLoc DL;
 226   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
 227        I != E; ++I) {
 228     for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
 229          II != E; ++II) {
 230       DL = II->getDebugLoc();
 231       if (!DL.isUnknown())
 232         return DL;
 233     }
 234   }
 235   return DL;
 236 }
 237
 238 /// BeginFunction - Emit necessary debug info to start a function.
 239 ///
 240 void PIC16DbgInfo::BeginFunction(const MachineFunction &MF) {
 241   if (! EmitDebugDirectives) return;
 242
 243   // Retreive the first valid debug Loc and process it.
 244   const DebugLoc &DL = GetDebugLocForFunction(MF);
 245   // Emit debug info only if valid debug info is available.
 246   if (!DL.isUnknown()) {
 247     ChangeDebugLoc(MF, DL, true);
 248     EmitFunctBeginDI(MF.getFunction());
 249   }
 250   // Set current line to 0 so that.line directive is genearted after .bf.
 251   CurLine = 0;
 252 }
 253
 254 /// ChangeDebugLoc - Take necessary steps when DebugLoc changes.
 255 /// CurFile and CurLine may change as a result of this.
 256 ///
 257 void PIC16DbgInfo::ChangeDebugLoc(const MachineFunction &MF,
 258                                   const DebugLoc &DL, bool IsInBeginFunction) {
 259   if (! EmitDebugDirectives) return;
 260   assert (! DL.isUnknown()  && "can't change to invalid debug loc");
 261
 262   MDNode *CU = MF.getDebugLocTuple(DL).CompileUnit;
 263   unsigned line = MF.getDebugLocTuple(DL).Line;
 264
 265   SwitchToCU(CU);
 266   SwitchToLine(line, IsInBeginFunction);
 267 }
 268
 269 /// SwitchToLine - Emit line directive for a new line.
 270 ///
 271 void PIC16DbgInfo::SwitchToLine(unsigned Line, bool IsInBeginFunction) {
 272   if (CurLine == Line) return;
 273   if (!IsInBeginFunction)  O << "\n\t.line " << Line << "\n";
 274   CurLine = Line;
 275 }
 276
 277 /// EndFunction - Emit .ef for end of function.
 278 ///
 279 void PIC16DbgInfo::EndFunction(const MachineFunction &MF) {
 280   if (! EmitDebugDirectives) return;
 281   const DebugLoc &DL = GetDebugLocForFunction(MF);
 282   // Emit debug info only if valid debug info is available.
 283   if (!DL.isUnknown())
 284     EmitFunctEndDI(MF.getFunction(), CurLine);
 285 }
 286
 287 /// EndModule - Emit .eof for end of module.
 288 ///
 289 void PIC16DbgInfo::EndModule(Module &M) {
 290   if (! EmitDebugDirectives) return;
 291   EmitVarDebugInfo(M);
 292   if (CurFile != "") O << "\n\t.eof";
 293 }
 294
 295 /// EmitCompositeTypeElements - Emit debug information for members of a
 296 /// composite type.
 297 ///
 298 void PIC16DbgInfo::EmitCompositeTypeElements (DICompositeType CTy,
 299                                               std::string SuffixNo) {
 300   unsigned long Value = 0;
 301   DIArray Elements = CTy.getTypeArray();
 302   for (unsigned i = 0, N = Elements.getNumElements(); i < N; i++) {
 303     DIDescriptor Element = Elements.getElement(i);
 304     unsigned short TypeNo = 0;
 305     bool HasAux = false;
 306     int ElementAux[PIC16Dbg::AuxSize] = { 0 };
 307     std::string TagName = "";
 308     std::string ElementName;
 309     DIDerivedType DITy(Element.getNode());
 310     DITy.getName(ElementName);
 311     unsigned short ElementSize = DITy.getSizeInBits()/8;
 312     // Get mangleddd name for this structure/union  element.
 313     std::string MangMemName = ElementName + SuffixNo;
 314     PopulateDebugInfo(DITy, TypeNo, HasAux, ElementAux, TagName);
 315     short Class = 0;
 316     if( CTy.getTag() == dwarf::DW_TAG_union_type)
 317       Class = PIC16Dbg::C_MOU;
 318     else if  (CTy.getTag() == dwarf::DW_TAG_structure_type)
 319       Class = PIC16Dbg::C_MOS;
 320     EmitSymbol(MangMemName.c_str(), Class, TypeNo, Value);
 321     if (CTy.getTag() == dwarf::DW_TAG_structure_type)
 322       Value += ElementSize;
 323     if (HasAux)
 324       EmitAuxEntry(MangMemName.c_str(), ElementAux, PIC16Dbg::AuxSize, TagName);
 325   }
 326 }
 327
 328 /// EmitCompositeTypeDecls - Emit composite type declarations like structure
 329 /// and union declarations.
 330 ///
 331 void PIC16DbgInfo::EmitCompositeTypeDecls(Module &M) {
 332   DebugInfoFinder DbgFinder;
 333   DbgFinder.processModule(M);
 334   for (DebugInfoFinder::iterator I = DbgFinder.type_begin(),
 335          E = DbgFinder.type_end(); I != E; ++I) {
 336     DICompositeType CTy(*I);
 337     if (CTy.isNull())
 338       continue;
 339     if (CTy.getTag() == dwarf::DW_TAG_union_type ||
 340         CTy.getTag() == dwarf::DW_TAG_structure_type ) {
 341       std::string Name;
 342       CTy.getName(Name);
 343       // Get the number after llvm.dbg.composite and make UniqueSuffix from
 344       // it.
 345       std::string DIVar = CTy.getNode()->getNameStr();
 346       std::string UniqueSuffix = "." + DIVar.substr(18);
 347       std::string MangledCTyName = Name + UniqueSuffix;
 348       unsigned short size = CTy.getSizeInBits()/8;
 349       int Aux[PIC16Dbg::AuxSize] = {0};
 350       // 7th and 8th byte represent size of structure/union.
 351       Aux[6] = size & 0xff;
 352       Aux[7] = size >> 8;
 353       // Emit .def for structure/union tag.
 354       if( CTy.getTag() == dwarf::DW_TAG_union_type)
 355         EmitSymbol(MangledCTyName.c_str(), PIC16Dbg::C_UNTAG);
 356       else if  (CTy.getTag() == dwarf::DW_TAG_structure_type)
 357         EmitSymbol(MangledCTyName.c_str(), PIC16Dbg::C_STRTAG);
 358
 359       // Emit auxiliary debug information for structure/union tag.
 360       EmitAuxEntry(MangledCTyName.c_str(), Aux, PIC16Dbg::AuxSize);
 361
 362       // Emit members.
 363       EmitCompositeTypeElements (CTy, UniqueSuffix);
 364
 365       // Emit mangled Symbol for end of structure/union.
 366       std::string EOSSymbol = ".eos" + UniqueSuffix;
 367       EmitSymbol(EOSSymbol.c_str(), PIC16Dbg::C_EOS);
 368       EmitAuxEntry(EOSSymbol.c_str(), Aux, PIC16Dbg::AuxSize,
 369                    MangledCTyName.c_str());
 370     }
 371   }
 372 }
 373
 374
 375 /// EmitFunctBeginDI - Emit .bf for function.
 376 ///
 377 void PIC16DbgInfo::EmitFunctBeginDI(const Function *F) {
 378   std::string FunctName = F->getName();
 379   if (EmitDebugDirectives) {
 380     std::string FunctBeginSym = ".bf." + FunctName;
 381     std::string BlockBeginSym = ".bb." + FunctName;
 382
 383     int BFAux[PIC16Dbg::AuxSize] = {0};
 384     BFAux[4] = CurLine;
 385     BFAux[5] = CurLine >> 8;
 386
 387     // Emit debug directives for beginning of function.
 388     EmitSymbol(FunctBeginSym, PIC16Dbg::C_FCN);
 389     EmitAuxEntry(FunctBeginSym, BFAux, PIC16Dbg::AuxSize);
 390
 391     EmitSymbol(BlockBeginSym, PIC16Dbg::C_BLOCK);
 392     EmitAuxEntry(BlockBeginSym, BFAux, PIC16Dbg::AuxSize);
 393   }
 394 }
 395
 396 /// EmitFunctEndDI - Emit .ef for function end.
 397 ///
 398 void PIC16DbgInfo::EmitFunctEndDI(const Function *F, unsigned Line) {
 399   std::string FunctName = F->getName();
 400   if (EmitDebugDirectives) {
 401     std::string FunctEndSym = ".ef." + FunctName;
 402     std::string BlockEndSym = ".eb." + FunctName;
 403
 404     // Emit debug directives for end of function.
 405     EmitSymbol(BlockEndSym, PIC16Dbg::C_BLOCK);
 406     int EFAux[PIC16Dbg::AuxSize] = {0};
 407     // 5th and 6th byte stand for line number.
 408     EFAux[4] = CurLine;
 409     EFAux[5] = CurLine >> 8;
 410     EmitAuxEntry(BlockEndSym, EFAux, PIC16Dbg::AuxSize);
 411     EmitSymbol(FunctEndSym, PIC16Dbg::C_FCN);
 412     EmitAuxEntry(FunctEndSym, EFAux, PIC16Dbg::AuxSize);
 413   }
 414 }
 415
 416 /// EmitAuxEntry - Emit Auxiliary debug information.
 417 ///
 418 void PIC16DbgInfo::EmitAuxEntry(const std::string VarName, int Aux[], int Num,
 419                                 std::string TagName) {
 420   O << "\n\t.dim " << VarName << ", 1" ;
 421   // TagName is emitted in case of structure/union objects.
 422   if (TagName != "")
 423     O << ", " << TagName;
 424   for (int i = 0; i<Num; i++)
 425     O << "," << Aux[i];
 426 }
 427
 428 /// EmitSymbol - Emit .def for a symbol. Value is offset for the member.
 429 ///
 430 void PIC16DbgInfo::EmitSymbol(std::string Name, short Class, unsigned short
 431                               Type, unsigned long Value) {
 432   O << "\n\t" << ".def "<< Name << ", type = " << Type << ", class = "
 433     << Class;
 434   if (Value > 0)
 435     O  << ", value = " << Value;
 436 }
 437
 438 /// EmitVarDebugInfo - Emit debug information for all variables.
 439 ///
 440 void PIC16DbgInfo::EmitVarDebugInfo(Module &M) {
 441   DebugInfoFinder DbgFinder;
 442   DbgFinder.processModule(M);
 443
 444   for (DebugInfoFinder::iterator I = DbgFinder.global_variable_begin(),
 445          E = DbgFinder.global_variable_end(); I != E; ++I) {
 446     DIGlobalVariable DIGV(*I);
 447     DIType Ty = DIGV.getType();
 448     unsigned short TypeNo = 0;
 449     bool HasAux = false;
 450     int Aux[PIC16Dbg::AuxSize] = { 0 };
 451     std::string TagName = "";
 452     std::string VarName = MAI->getGlobalPrefix()+DIGV.getGlobal()->getNameStr();
 453     PopulateDebugInfo(Ty, TypeNo, HasAux, Aux, TagName);
 454     // Emit debug info only if type information is availaible.
 455     if (TypeNo != PIC16Dbg::T_NULL) {
 456       O << "\n\t.type " << VarName << ", " << TypeNo;
 457       short ClassNo = getStorageClass(DIGV);
 458       O << "\n\t.class " << VarName << ", " << ClassNo;
 459       if (HasAux)
 460         EmitAuxEntry(VarName, Aux, PIC16Dbg::AuxSize, TagName);
 461     }
 462   }
 463   O << "\n";
 464 }
 465
 466 /// SwitchToCU - Switch to a new compilation unit.
 467 ///
 468 void PIC16DbgInfo::SwitchToCU(MDNode *CU) {
 469   // Get the file path from CU.
 470   DICompileUnit cu(CU);
 471   std::string DirName, FileName;
 472   std::string FilePath = cu.getDirectory(DirName) + "/" +
 473                          cu.getFilename(FileName);
 474
 475   // Nothing to do if source file is still same.
 476   if ( FilePath == CurFile ) return;
 477
 478   // Else, close the current one and start a new.
 479   if (CurFile != "") O << "\n\t.eof";
 480   O << "\n\t.file\t\"" << FilePath << "\"\n" ;
 481   CurFile = FilePath;
 482   CurLine = 0;
 483 }
 484
 485 /// EmitEOF - Emit .eof for end of file.
 486 ///
 487 void PIC16DbgInfo::EmitEOF() {
 488   if (CurFile != "")
 489     O << "\n\t.EOF";
 490 }
 491