1 //===-- llvm/CodeGen/DwarfCompileUnit.cpp - Dwarf Compile Unit ------------===//
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 support for constructing a dwarf compile unit.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "dwarfdebug"
16 #include "DwarfCompileUnit.h"
17 #include "DwarfAccelTable.h"
18 #include "DwarfDebug.h"
19 #include "llvm/ADT/APFloat.h"
20 #include "llvm/DIBuilder.h"
21 #include "llvm/IR/Constants.h"
22 #include "llvm/IR/DataLayout.h"
23 #include "llvm/IR/GlobalVariable.h"
24 #include "llvm/IR/Instructions.h"
25 #include "llvm/Target/Mangler.h"
26 #include "llvm/Target/TargetFrameLowering.h"
27 #include "llvm/Target/TargetMachine.h"
28 #include "llvm/Target/TargetLoweringObjectFile.h"
29 #include "llvm/Target/TargetRegisterInfo.h"
33 /// CompileUnit - Compile unit constructor.
34 CompileUnit::CompileUnit(unsigned UID, DIE *D, const MDNode *N, AsmPrinter *A,
35 DwarfDebug *DW, DwarfUnits *DWU)
36 : UniqueID(UID), Node(N), CUDie(D), Asm(A), DD(DW), DU(DWU), IndexTyDie(0) {
37 DIEIntegerOne = new (DIEValueAllocator) DIEInteger(1);
41 /// ~CompileUnit - Destructor for compile unit.
42 CompileUnit::~CompileUnit() {
43 for (unsigned j = 0, M = DIEBlocks.size(); j < M; ++j)
44 DIEBlocks[j]->~DIEBlock();
47 /// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
48 /// information entry.
49 DIEEntry *CompileUnit::createDIEEntry(DIE *Entry) {
50 DIEEntry *Value = new (DIEValueAllocator) DIEEntry(Entry);
54 /// getDefaultLowerBound - Return the default lower bound for an array. If the
55 /// DWARF version doesn't handle the language, return -1.
56 int64_t CompileUnit::getDefaultLowerBound() const {
57 switch (DICompileUnit(Node).getLanguage()) {
61 case dwarf::DW_LANG_C89:
62 case dwarf::DW_LANG_C99:
63 case dwarf::DW_LANG_C:
64 case dwarf::DW_LANG_C_plus_plus:
65 case dwarf::DW_LANG_ObjC:
66 case dwarf::DW_LANG_ObjC_plus_plus:
69 case dwarf::DW_LANG_Fortran77:
70 case dwarf::DW_LANG_Fortran90:
71 case dwarf::DW_LANG_Fortran95:
74 // The languages below have valid values only if the DWARF version >= 4.
75 case dwarf::DW_LANG_Java:
76 case dwarf::DW_LANG_Python:
77 case dwarf::DW_LANG_UPC:
78 case dwarf::DW_LANG_D:
79 if (dwarf::DWARF_VERSION >= 4)
83 case dwarf::DW_LANG_Ada83:
84 case dwarf::DW_LANG_Ada95:
85 case dwarf::DW_LANG_Cobol74:
86 case dwarf::DW_LANG_Cobol85:
87 case dwarf::DW_LANG_Modula2:
88 case dwarf::DW_LANG_Pascal83:
89 case dwarf::DW_LANG_PLI:
90 if (dwarf::DWARF_VERSION >= 4)
98 /// addFlag - Add a flag that is true.
99 void CompileUnit::addFlag(DIE *Die, uint16_t Attribute) {
100 if (DD->getDwarfVersion() >= 4)
101 Die->addValue(Attribute, dwarf::DW_FORM_flag_present, DIEIntegerOne);
103 Die->addValue(Attribute, dwarf::DW_FORM_flag, DIEIntegerOne);
106 /// addUInt - Add an unsigned integer attribute data and value.
108 void CompileUnit::addUInt(DIE *Die, uint16_t Attribute,
109 uint16_t Form, uint64_t Integer) {
110 if (!Form) Form = DIEInteger::BestForm(false, Integer);
111 DIEValue *Value = Integer == 1 ?
112 DIEIntegerOne : new (DIEValueAllocator) DIEInteger(Integer);
113 Die->addValue(Attribute, Form, Value);
116 /// addSInt - Add an signed integer attribute data and value.
118 void CompileUnit::addSInt(DIE *Die, uint16_t Attribute,
119 uint16_t Form, int64_t Integer) {
120 if (!Form) Form = DIEInteger::BestForm(true, Integer);
121 DIEValue *Value = new (DIEValueAllocator) DIEInteger(Integer);
122 Die->addValue(Attribute, Form, Value);
125 /// addString - Add a string attribute data and value. We always emit a
126 /// reference to the string pool instead of immediate strings so that DIEs have
127 /// more predictable sizes. In the case of split dwarf we emit an index
128 /// into another table which gets us the static offset into the string
130 void CompileUnit::addString(DIE *Die, uint16_t Attribute, StringRef String) {
133 if (!DD->useSplitDwarf()) {
134 MCSymbol *Symb = DU->getStringPoolEntry(String);
135 if (Asm->needsRelocationsForDwarfStringPool())
136 Value = new (DIEValueAllocator) DIELabel(Symb);
138 MCSymbol *StringPool = DU->getStringPoolSym();
139 Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool);
141 Form = dwarf::DW_FORM_strp;
143 unsigned idx = DU->getStringPoolIndex(String);
144 Value = new (DIEValueAllocator) DIEInteger(idx);
145 Form = dwarf::DW_FORM_GNU_str_index;
147 DIEValue *Str = new (DIEValueAllocator) DIEString(Value, String);
148 Die->addValue(Attribute, Form, Str);
151 /// addLocalString - Add a string attribute data and value. This is guaranteed
152 /// to be in the local string pool instead of indirected.
153 void CompileUnit::addLocalString(DIE *Die, uint16_t Attribute,
155 MCSymbol *Symb = DU->getStringPoolEntry(String);
157 if (Asm->needsRelocationsForDwarfStringPool())
158 Value = new (DIEValueAllocator) DIELabel(Symb);
160 MCSymbol *StringPool = DU->getStringPoolSym();
161 Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool);
163 Die->addValue(Attribute, dwarf::DW_FORM_strp, Value);
166 /// addExpr - Add a Dwarf expression attribute data and value.
168 void CompileUnit::addExpr(DIE *Die, uint16_t Attribute, uint16_t Form,
169 const MCExpr *Expr) {
170 DIEValue *Value = new (DIEValueAllocator) DIEExpr(Expr);
171 Die->addValue(Attribute, Form, Value);
174 /// addLabel - Add a Dwarf label attribute data and value.
176 void CompileUnit::addLabel(DIE *Die, uint16_t Attribute, uint16_t Form,
177 const MCSymbol *Label) {
178 DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
179 Die->addValue(Attribute, Form, Value);
182 /// addLabelAddress - Add a dwarf label attribute data and value using
183 /// DW_FORM_addr or DW_FORM_GNU_addr_index.
185 void CompileUnit::addLabelAddress(DIE *Die, uint16_t Attribute,
188 DD->addArangeLabel(SymbolCU(this, Label));
190 if (!DD->useSplitDwarf()) {
192 DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
193 Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
195 DIEValue *Value = new (DIEValueAllocator) DIEInteger(0);
196 Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
199 unsigned idx = DU->getAddrPoolIndex(Label);
200 DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
201 Die->addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, Value);
205 /// addOpAddress - Add a dwarf op address data and value using the
206 /// form given and an op of either DW_FORM_addr or DW_FORM_GNU_addr_index.
208 void CompileUnit::addOpAddress(DIE *Die, const MCSymbol *Sym) {
209 DD->addArangeLabel(SymbolCU(this, Sym));
210 if (!DD->useSplitDwarf()) {
211 addUInt(Die, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
212 addLabel(Die, 0, dwarf::DW_FORM_udata, Sym);
214 addUInt(Die, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_addr_index);
215 addUInt(Die, 0, dwarf::DW_FORM_GNU_addr_index, DU->getAddrPoolIndex(Sym));
219 /// addDelta - Add a label delta attribute data and value.
221 void CompileUnit::addDelta(DIE *Die, uint16_t Attribute, uint16_t Form,
222 const MCSymbol *Hi, const MCSymbol *Lo) {
223 DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo);
224 Die->addValue(Attribute, Form, Value);
227 /// addDIEEntry - Add a DIE attribute data and value.
229 void CompileUnit::addDIEEntry(DIE *Die, uint16_t Attribute, DIE *Entry) {
230 // We currently only use ref4.
231 Die->addValue(Attribute, dwarf::DW_FORM_ref4, createDIEEntry(Entry));
234 /// addBlock - Add block data.
236 void CompileUnit::addBlock(DIE *Die, uint16_t Attribute, uint16_t Form,
238 Block->ComputeSize(Asm);
239 DIEBlocks.push_back(Block); // Memoize so we can call the destructor later on.
240 Die->addValue(Attribute, Block->BestForm(), Block);
243 /// addSourceLine - Add location information to specified debug information
245 void CompileUnit::addSourceLine(DIE *Die, DIVariable V) {
250 unsigned Line = V.getLineNumber();
253 unsigned FileID = DD->getOrCreateSourceID(V.getContext().getFilename(),
254 V.getContext().getDirectory(),
256 assert(FileID && "Invalid file id");
257 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
258 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
261 /// addSourceLine - Add location information to specified debug information
263 void CompileUnit::addSourceLine(DIE *Die, DIGlobalVariable G) {
264 // Verify global variable.
265 if (!G.isGlobalVariable())
268 unsigned Line = G.getLineNumber();
271 unsigned FileID = DD->getOrCreateSourceID(G.getFilename(), G.getDirectory(),
273 assert(FileID && "Invalid file id");
274 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
275 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
278 /// addSourceLine - Add location information to specified debug information
280 void CompileUnit::addSourceLine(DIE *Die, DISubprogram SP) {
281 // Verify subprogram.
282 if (!SP.isSubprogram())
285 // If the line number is 0, don't add it.
286 unsigned Line = SP.getLineNumber();
290 unsigned FileID = DD->getOrCreateSourceID(SP.getFilename(),
291 SP.getDirectory(), getUniqueID());
292 assert(FileID && "Invalid file id");
293 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
294 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
297 /// addSourceLine - Add location information to specified debug information
299 void CompileUnit::addSourceLine(DIE *Die, DIType Ty) {
304 unsigned Line = Ty.getLineNumber();
307 unsigned FileID = DD->getOrCreateSourceID(Ty.getFilename(),
308 Ty.getDirectory(), getUniqueID());
309 assert(FileID && "Invalid file id");
310 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
311 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
314 /// addSourceLine - Add location information to specified debug information
316 void CompileUnit::addSourceLine(DIE *Die, DIObjCProperty Ty) {
318 if (!Ty.isObjCProperty())
321 unsigned Line = Ty.getLineNumber();
324 DIFile File = Ty.getFile();
325 unsigned FileID = DD->getOrCreateSourceID(File.getFilename(),
326 File.getDirectory(), getUniqueID());
327 assert(FileID && "Invalid file id");
328 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
329 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
332 /// addSourceLine - Add location information to specified debug information
334 void CompileUnit::addSourceLine(DIE *Die, DINameSpace NS) {
339 unsigned Line = NS.getLineNumber();
342 StringRef FN = NS.getFilename();
344 unsigned FileID = DD->getOrCreateSourceID(FN, NS.getDirectory(),
346 assert(FileID && "Invalid file id");
347 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
348 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
351 /// addVariableAddress - Add DW_AT_location attribute for a
352 /// DbgVariable based on provided MachineLocation.
353 void CompileUnit::addVariableAddress(const DbgVariable &DV, DIE *Die,
354 MachineLocation Location) {
355 if (DV.variableHasComplexAddress())
356 addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
357 else if (DV.isBlockByrefVariable())
358 addBlockByrefAddress(DV, Die, dwarf::DW_AT_location, Location);
360 addAddress(Die, dwarf::DW_AT_location, Location,
361 DV.getVariable().isIndirect());
364 /// addRegisterOp - Add register operand.
365 void CompileUnit::addRegisterOp(DIE *TheDie, unsigned Reg) {
366 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
367 unsigned DWReg = RI->getDwarfRegNum(Reg, false);
369 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + DWReg);
371 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_regx);
372 addUInt(TheDie, 0, dwarf::DW_FORM_udata, DWReg);
376 /// addRegisterOffset - Add register offset.
377 void CompileUnit::addRegisterOffset(DIE *TheDie, unsigned Reg,
379 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
380 unsigned DWReg = RI->getDwarfRegNum(Reg, false);
381 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
382 if (Reg == TRI->getFrameRegister(*Asm->MF))
383 // If variable offset is based in frame register then use fbreg.
384 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_fbreg);
386 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + DWReg);
388 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
389 addUInt(TheDie, 0, dwarf::DW_FORM_udata, DWReg);
391 addSInt(TheDie, 0, dwarf::DW_FORM_sdata, Offset);
394 /// addAddress - Add an address attribute to a die based on the location
396 void CompileUnit::addAddress(DIE *Die, uint16_t Attribute,
397 const MachineLocation &Location, bool Indirect) {
398 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
400 if (Location.isReg() && !Indirect)
401 addRegisterOp(Block, Location.getReg());
403 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
404 if (Indirect && !Location.isReg()) {
405 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
409 // Now attach the location information to the DIE.
410 addBlock(Die, Attribute, 0, Block);
413 /// addComplexAddress - Start with the address based on the location provided,
414 /// and generate the DWARF information necessary to find the actual variable
415 /// given the extra address information encoded in the DIVariable, starting from
416 /// the starting location. Add the DWARF information to the die.
418 void CompileUnit::addComplexAddress(const DbgVariable &DV, DIE *Die,
420 const MachineLocation &Location) {
421 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
422 unsigned N = DV.getNumAddrElements();
424 if (Location.isReg()) {
425 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
426 // If first address element is OpPlus then emit
427 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
428 addRegisterOffset(Block, Location.getReg(), DV.getAddrElement(1));
431 addRegisterOp(Block, Location.getReg());
434 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
437 uint64_t Element = DV.getAddrElement(i);
438 if (Element == DIBuilder::OpPlus) {
439 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
440 addUInt(Block, 0, dwarf::DW_FORM_udata, DV.getAddrElement(++i));
441 } else if (Element == DIBuilder::OpDeref) {
442 if (!Location.isReg())
443 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
444 } else llvm_unreachable("unknown DIBuilder Opcode");
447 // Now attach the location information to the DIE.
448 addBlock(Die, Attribute, 0, Block);
451 /* Byref variables, in Blocks, are declared by the programmer as "SomeType
452 VarName;", but the compiler creates a __Block_byref_x_VarName struct, and
453 gives the variable VarName either the struct, or a pointer to the struct, as
454 its type. This is necessary for various behind-the-scenes things the
455 compiler needs to do with by-reference variables in Blocks.
457 However, as far as the original *programmer* is concerned, the variable
458 should still have type 'SomeType', as originally declared.
460 The function getBlockByrefType dives into the __Block_byref_x_VarName
461 struct to find the original type of the variable, which is then assigned to
462 the variable's Debug Information Entry as its real type. So far, so good.
463 However now the debugger will expect the variable VarName to have the type
464 SomeType. So we need the location attribute for the variable to be an
465 expression that explains to the debugger how to navigate through the
466 pointers and struct to find the actual variable of type SomeType.
468 The following function does just that. We start by getting
469 the "normal" location for the variable. This will be the location
470 of either the struct __Block_byref_x_VarName or the pointer to the
471 struct __Block_byref_x_VarName.
473 The struct will look something like:
475 struct __Block_byref_x_VarName {
477 struct __Block_byref_x_VarName *forwarding;
478 ... <various other fields>
480 ... <maybe more fields>
483 If we are given the struct directly (as our starting point) we
484 need to tell the debugger to:
486 1). Add the offset of the forwarding field.
488 2). Follow that pointer to get the real __Block_byref_x_VarName
489 struct to use (the real one may have been copied onto the heap).
491 3). Add the offset for the field VarName, to find the actual variable.
493 If we started with a pointer to the struct, then we need to
494 dereference that pointer first, before the other steps.
495 Translating this into DWARF ops, we will need to append the following
496 to the current location description for the variable:
498 DW_OP_deref -- optional, if we start with a pointer
499 DW_OP_plus_uconst <forward_fld_offset>
501 DW_OP_plus_uconst <varName_fld_offset>
503 That is what this function does. */
505 /// addBlockByrefAddress - Start with the address based on the location
506 /// provided, and generate the DWARF information necessary to find the
507 /// actual Block variable (navigating the Block struct) based on the
508 /// starting location. Add the DWARF information to the die. For
509 /// more information, read large comment just above here.
511 void CompileUnit::addBlockByrefAddress(const DbgVariable &DV, DIE *Die,
513 const MachineLocation &Location) {
514 DIType Ty = DV.getType();
516 uint16_t Tag = Ty.getTag();
517 bool isPointer = false;
519 StringRef varName = DV.getName();
521 if (Tag == dwarf::DW_TAG_pointer_type) {
522 DIDerivedType DTy = DIDerivedType(Ty);
523 TmpTy = resolve(DTy.getTypeDerivedFrom());
527 DICompositeType blockStruct = DICompositeType(TmpTy);
529 // Find the __forwarding field and the variable field in the __Block_byref
531 DIArray Fields = blockStruct.getTypeArray();
532 DIDescriptor varField = DIDescriptor();
533 DIDescriptor forwardingField = DIDescriptor();
535 for (unsigned i = 0, N = Fields.getNumElements(); i < N; ++i) {
536 DIDescriptor Element = Fields.getElement(i);
537 DIDerivedType DT = DIDerivedType(Element);
538 StringRef fieldName = DT.getName();
539 if (fieldName == "__forwarding")
540 forwardingField = Element;
541 else if (fieldName == varName)
545 // Get the offsets for the forwarding field and the variable field.
546 unsigned forwardingFieldOffset =
547 DIDerivedType(forwardingField).getOffsetInBits() >> 3;
548 unsigned varFieldOffset =
549 DIDerivedType(varField).getOffsetInBits() >> 3;
551 // Decode the original location, and use that as the start of the byref
552 // variable's location.
553 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
555 if (Location.isReg())
556 addRegisterOp(Block, Location.getReg());
558 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
560 // If we started with a pointer to the __Block_byref... struct, then
561 // the first thing we need to do is dereference the pointer (DW_OP_deref).
563 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
565 // Next add the offset for the '__forwarding' field:
566 // DW_OP_plus_uconst ForwardingFieldOffset. Note there's no point in
567 // adding the offset if it's 0.
568 if (forwardingFieldOffset > 0) {
569 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
570 addUInt(Block, 0, dwarf::DW_FORM_udata, forwardingFieldOffset);
573 // Now dereference the __forwarding field to get to the real __Block_byref
574 // struct: DW_OP_deref.
575 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
577 // Now that we've got the real __Block_byref... struct, add the offset
578 // for the variable's field to get to the location of the actual variable:
579 // DW_OP_plus_uconst varFieldOffset. Again, don't add if it's 0.
580 if (varFieldOffset > 0) {
581 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
582 addUInt(Block, 0, dwarf::DW_FORM_udata, varFieldOffset);
585 // Now attach the location information to the DIE.
586 addBlock(Die, Attribute, 0, Block);
589 /// isTypeSigned - Return true if the type is signed.
590 static bool isTypeSigned(DwarfDebug *DD, DIType Ty, int *SizeInBits) {
591 if (Ty.isDerivedType())
592 return isTypeSigned(DD, DD->resolve(DIDerivedType(Ty).getTypeDerivedFrom()),
594 if (Ty.isBasicType())
595 if (DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed
596 || DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed_char) {
597 *SizeInBits = Ty.getSizeInBits();
603 /// Return true if type encoding is unsigned.
604 static bool isUnsignedDIType(DwarfDebug *DD, DIType Ty) {
605 DIDerivedType DTy(Ty);
606 if (DTy.isDerivedType())
607 return isUnsignedDIType(DD, DD->resolve(DTy.getTypeDerivedFrom()));
610 if (BTy.isBasicType()) {
611 unsigned Encoding = BTy.getEncoding();
612 if (Encoding == dwarf::DW_ATE_unsigned ||
613 Encoding == dwarf::DW_ATE_unsigned_char ||
614 Encoding == dwarf::DW_ATE_boolean)
620 /// If this type is derived from a base type then return base type size.
621 static uint64_t getBaseTypeSize(DwarfDebug *DD, DIDerivedType Ty) {
622 unsigned Tag = Ty.getTag();
624 if (Tag != dwarf::DW_TAG_member && Tag != dwarf::DW_TAG_typedef &&
625 Tag != dwarf::DW_TAG_const_type && Tag != dwarf::DW_TAG_volatile_type &&
626 Tag != dwarf::DW_TAG_restrict_type)
627 return Ty.getSizeInBits();
629 DIType BaseType = DD->resolve(Ty.getTypeDerivedFrom());
631 // If this type is not derived from any type then take conservative approach.
632 if (!BaseType.isValid())
633 return Ty.getSizeInBits();
635 // If this is a derived type, go ahead and get the base type, unless it's a
636 // reference then it's just the size of the field. Pointer types have no need
637 // of this since they're a different type of qualification on the type.
638 if (BaseType.getTag() == dwarf::DW_TAG_reference_type ||
639 BaseType.getTag() == dwarf::DW_TAG_rvalue_reference_type)
640 return Ty.getSizeInBits();
642 if (BaseType.isDerivedType())
643 return getBaseTypeSize(DD, DIDerivedType(BaseType));
645 return BaseType.getSizeInBits();
648 /// addConstantValue - Add constant value entry in variable DIE.
649 void CompileUnit::addConstantValue(DIE *Die, const MachineOperand &MO,
651 // FIXME: This is a bit conservative/simple - it emits negative values at
652 // their maximum bit width which is a bit unfortunate (& doesn't prefer
653 // udata/sdata over dataN as suggested by the DWARF spec)
654 assert(MO.isImm() && "Invalid machine operand!");
656 bool SignedConstant = isTypeSigned(DD, Ty, &SizeInBits);
659 // If we're a signed constant definitely use sdata.
660 if (SignedConstant) {
661 addSInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, MO.getImm());
665 // Else use data for now unless it's larger than we can deal with.
666 switch (SizeInBits) {
668 Form = dwarf::DW_FORM_data1;
671 Form = dwarf::DW_FORM_data2;
674 Form = dwarf::DW_FORM_data4;
677 Form = dwarf::DW_FORM_data8;
680 Form = dwarf::DW_FORM_udata;
681 addUInt(Die, dwarf::DW_AT_const_value, Form, MO.getImm());
684 addUInt(Die, dwarf::DW_AT_const_value, Form, MO.getImm());
687 /// addConstantFPValue - Add constant value entry in variable DIE.
688 void CompileUnit::addConstantFPValue(DIE *Die, const MachineOperand &MO) {
689 assert (MO.isFPImm() && "Invalid machine operand!");
690 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
691 APFloat FPImm = MO.getFPImm()->getValueAPF();
693 // Get the raw data form of the floating point.
694 const APInt FltVal = FPImm.bitcastToAPInt();
695 const char *FltPtr = (const char*)FltVal.getRawData();
697 int NumBytes = FltVal.getBitWidth() / 8; // 8 bits per byte.
698 bool LittleEndian = Asm->getDataLayout().isLittleEndian();
699 int Incr = (LittleEndian ? 1 : -1);
700 int Start = (LittleEndian ? 0 : NumBytes - 1);
701 int Stop = (LittleEndian ? NumBytes : -1);
703 // Output the constant to DWARF one byte at a time.
704 for (; Start != Stop; Start += Incr)
705 addUInt(Block, 0, dwarf::DW_FORM_data1,
706 (unsigned char)0xFF & FltPtr[Start]);
708 addBlock(Die, dwarf::DW_AT_const_value, 0, Block);
711 /// addConstantFPValue - Add constant value entry in variable DIE.
712 void CompileUnit::addConstantFPValue(DIE *Die, const ConstantFP *CFP) {
713 // Pass this down to addConstantValue as an unsigned bag of bits.
714 addConstantValue(Die, CFP->getValueAPF().bitcastToAPInt(), true);
717 /// addConstantValue - Add constant value entry in variable DIE.
718 void CompileUnit::addConstantValue(DIE *Die, const ConstantInt *CI,
720 addConstantValue(Die, CI->getValue(), Unsigned);
723 // addConstantValue - Add constant value entry in variable DIE.
724 void CompileUnit::addConstantValue(DIE *Die, const APInt &Val, bool Unsigned) {
725 unsigned CIBitWidth = Val.getBitWidth();
726 if (CIBitWidth <= 64) {
727 // If we're a signed constant definitely use sdata.
729 addSInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata,
734 // Else use data for now unless it's larger than we can deal with.
736 switch (CIBitWidth) {
738 Form = dwarf::DW_FORM_data1;
741 Form = dwarf::DW_FORM_data2;
744 Form = dwarf::DW_FORM_data4;
747 Form = dwarf::DW_FORM_data8;
750 addUInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_udata,
754 addUInt(Die, dwarf::DW_AT_const_value, Form, Val.getZExtValue());
758 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
760 // Get the raw data form of the large APInt.
761 const uint64_t *Ptr64 = Val.getRawData();
763 int NumBytes = Val.getBitWidth() / 8; // 8 bits per byte.
764 bool LittleEndian = Asm->getDataLayout().isLittleEndian();
766 // Output the constant to DWARF one byte at a time.
767 for (int i = 0; i < NumBytes; i++) {
770 c = Ptr64[i / 8] >> (8 * (i & 7));
772 c = Ptr64[(NumBytes - 1 - i) / 8] >> (8 * ((NumBytes - 1 - i) & 7));
773 addUInt(Block, 0, dwarf::DW_FORM_data1, c);
776 addBlock(Die, dwarf::DW_AT_const_value, 0, Block);
779 /// addTemplateParams - Add template parameters into buffer.
780 void CompileUnit::addTemplateParams(DIE &Buffer, DIArray TParams) {
781 // Add template parameters.
782 for (unsigned i = 0, e = TParams.getNumElements(); i != e; ++i) {
783 DIDescriptor Element = TParams.getElement(i);
784 if (Element.isTemplateTypeParameter())
785 getOrCreateTemplateTypeParameterDIE(
786 DITemplateTypeParameter(Element), Buffer);
787 else if (Element.isTemplateValueParameter())
788 getOrCreateTemplateValueParameterDIE(
789 DITemplateValueParameter(Element), Buffer);
793 /// getOrCreateContextDIE - Get context owner's DIE.
794 DIE *CompileUnit::getOrCreateContextDIE(DIScope Context) {
795 if (Context.isType())
796 return getOrCreateTypeDIE(DIType(Context));
797 else if (Context.isNameSpace())
798 return getOrCreateNameSpace(DINameSpace(Context));
799 else if (Context.isSubprogram())
800 return getOrCreateSubprogramDIE(DISubprogram(Context));
802 return getDIE(Context);
805 /// addToContextOwner - Add Die into the list of its context owner's children.
806 void CompileUnit::addToContextOwner(DIE *Die, DIScope Context) {
807 assert(!Die->getParent());
808 if (DIE *ContextDIE = getOrCreateContextDIE(Context)) {
809 if (Die->getParent()) {
810 // While creating the context, if this is a type member, we will have
811 // added the child to the context already.
812 assert(Die->getParent() == ContextDIE);
815 ContextDIE->addChild(Die);
820 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
822 DIE *CompileUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
826 DIE *TyDIE = getDIE(Ty);
831 TyDIE = new DIE(Ty.getTag());
832 insertDIE(Ty, TyDIE);
833 if (Ty.isBasicType())
834 constructTypeDIE(*TyDIE, DIBasicType(Ty));
835 else if (Ty.isCompositeType())
836 constructTypeDIE(*TyDIE, DICompositeType(Ty));
838 assert(Ty.isDerivedType() && "Unknown kind of DIType");
839 constructTypeDIE(*TyDIE, DIDerivedType(Ty));
841 // If this is a named finished type then include it in the list of types
842 // for the accelerator tables.
843 if (!Ty.getName().empty() && !Ty.isForwardDecl()) {
844 bool IsImplementation = 0;
845 if (Ty.isCompositeType()) {
846 DICompositeType CT(Ty);
847 // A runtime language of 0 actually means C/C++ and that any
848 // non-negative value is some version of Objective-C/C++.
849 IsImplementation = (CT.getRunTimeLang() == 0) ||
850 CT.isObjcClassComplete();
852 unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0;
853 addAccelType(Ty.getName(), std::make_pair(TyDIE, Flags));
856 addToContextOwner(TyDIE, resolve(Ty.getContext()));
860 /// addType - Add a new type attribute to the specified entity.
861 void CompileUnit::addType(DIE *Entity, DIType Ty, uint16_t Attribute) {
862 assert(Ty && "Trying to add a type that doesn't exist?");
864 // Check for pre-existence.
865 DIEEntry *Entry = getDIEEntry(Ty);
866 // If it exists then use the existing value.
868 Entity->addValue(Attribute, dwarf::DW_FORM_ref4, Entry);
873 DIE *Buffer = getOrCreateTypeDIE(Ty);
876 Entry = createDIEEntry(Buffer);
877 insertDIEEntry(Ty, Entry);
878 Entity->addValue(Attribute, dwarf::DW_FORM_ref4, Entry);
880 // If this is a complete composite type then include it in the
881 // list of global types.
885 // Accelerator table mutators - add each name along with its companion
886 // DIE to the proper table while ensuring that the name that we're going
887 // to reference is in the string table. We do this since the names we
888 // add may not only be identical to the names in the DIE.
889 void CompileUnit::addAccelName(StringRef Name, DIE *Die) {
890 DU->getStringPoolEntry(Name);
891 std::vector<DIE *> &DIEs = AccelNames[Name];
895 void CompileUnit::addAccelObjC(StringRef Name, DIE *Die) {
896 DU->getStringPoolEntry(Name);
897 std::vector<DIE *> &DIEs = AccelObjC[Name];
901 void CompileUnit::addAccelNamespace(StringRef Name, DIE *Die) {
902 DU->getStringPoolEntry(Name);
903 std::vector<DIE *> &DIEs = AccelNamespace[Name];
907 void CompileUnit::addAccelType(StringRef Name, std::pair<DIE *, unsigned> Die) {
908 DU->getStringPoolEntry(Name);
909 std::vector<std::pair<DIE *, unsigned> > &DIEs = AccelTypes[Name];
913 /// addGlobalName - Add a new global name to the compile unit.
914 void CompileUnit::addGlobalName(StringRef Name, DIE *Die, DIScope Context) {
915 std::string FullName = getParentContextString(Context) + Name.str();
916 GlobalNames[FullName] = Die;
919 /// addGlobalType - Add a new global type to the compile unit.
921 void CompileUnit::addGlobalType(DIType Ty) {
922 DIScope Context = resolve(Ty.getContext());
923 if (!Ty.getName().empty() && !Ty.isForwardDecl() &&
924 (!Context || Context.isCompileUnit() || Context.isFile() ||
925 Context.isNameSpace()))
926 if (DIEEntry *Entry = getDIEEntry(Ty)) {
927 std::string FullName =
928 getParentContextString(Context) + Ty.getName().str();
929 GlobalTypes[FullName] = Entry->getEntry();
933 /// getParentContextString - Walks the metadata parent chain in a language
934 /// specific manner (using the compile unit language) and returns
935 /// it as a string. This is done at the metadata level because DIEs may
936 /// not currently have been added to the parent context and walking the
937 /// DIEs looking for names is more expensive than walking the metadata.
938 std::string CompileUnit::getParentContextString(DIScope Context) const {
942 // FIXME: Decide whether to implement this for non-C++ languages.
943 if (getLanguage() != dwarf::DW_LANG_C_plus_plus)
947 SmallVector<DIScope, 1> Parents;
948 while (!Context.isCompileUnit()) {
949 Parents.push_back(Context);
950 if (Context.getContext())
951 Context = resolve(Context.getContext());
953 // Structure, etc types will have a NULL context if they're at the top
958 // Reverse iterate over our list to go from the outermost construct to the
960 for (SmallVectorImpl<DIScope>::reverse_iterator I = Parents.rbegin(),
964 StringRef Name = Ctx.getName();
973 /// addPubTypes - Add subprogram argument types for pubtypes section.
974 void CompileUnit::addPubTypes(DISubprogram SP) {
975 DICompositeType SPTy = SP.getType();
976 uint16_t SPTag = SPTy.getTag();
977 if (SPTag != dwarf::DW_TAG_subroutine_type)
980 DIArray Args = SPTy.getTypeArray();
981 for (unsigned i = 0, e = Args.getNumElements(); i != e; ++i) {
982 DIType ATy(Args.getElement(i));
989 /// constructTypeDIE - Construct basic type die from DIBasicType.
990 void CompileUnit::constructTypeDIE(DIE &Buffer, DIBasicType BTy) {
991 // Get core information.
992 StringRef Name = BTy.getName();
993 // Add name if not anonymous or intermediate type.
995 addString(&Buffer, dwarf::DW_AT_name, Name);
997 // An unspecified type only has a name attribute.
998 if (BTy.getTag() == dwarf::DW_TAG_unspecified_type)
1001 addUInt(&Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1004 uint64_t Size = BTy.getSizeInBits() >> 3;
1005 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
1008 /// constructTypeDIE - Construct derived type die from DIDerivedType.
1009 void CompileUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
1010 // Get core information.
1011 StringRef Name = DTy.getName();
1012 uint64_t Size = DTy.getSizeInBits() >> 3;
1013 uint16_t Tag = Buffer.getTag();
1015 // Map to main type, void will not have a type.
1016 DIType FromTy = resolve(DTy.getTypeDerivedFrom());
1018 addType(&Buffer, FromTy);
1020 // Add name if not anonymous or intermediate type.
1022 addString(&Buffer, dwarf::DW_AT_name, Name);
1024 // Add size if non-zero (derived types might be zero-sized.)
1025 if (Size && Tag != dwarf::DW_TAG_pointer_type)
1026 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
1028 if (Tag == dwarf::DW_TAG_ptr_to_member_type)
1029 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
1030 getOrCreateTypeDIE(resolve(DTy.getClassType())));
1031 // Add source line info if available and TyDesc is not a forward declaration.
1032 if (!DTy.isForwardDecl())
1033 addSourceLine(&Buffer, DTy);
1036 /// Return true if the type is appropriately scoped to be contained inside
1037 /// its own type unit.
1038 static bool isTypeUnitScoped(DIType Ty, const DwarfDebug *DD) {
1039 DIScope Parent = DD->resolve(Ty.getContext());
1041 // Don't generate a hash for anything scoped inside a function.
1042 if (Parent.isSubprogram())
1044 Parent = DD->resolve(Parent.getContext());
1049 /// Return true if the type should be split out into a type unit.
1050 static bool shouldCreateTypeUnit(DICompositeType CTy, const DwarfDebug *DD) {
1051 uint16_t Tag = CTy.getTag();
1054 case dwarf::DW_TAG_structure_type:
1055 case dwarf::DW_TAG_union_type:
1056 case dwarf::DW_TAG_enumeration_type:
1057 case dwarf::DW_TAG_class_type:
1058 // If this is a class, structure, union, or enumeration type
1059 // that is a definition (not a declaration), and not scoped
1060 // inside a function then separate this out as a type unit.
1061 return !CTy.isForwardDecl() && isTypeUnitScoped(CTy, DD);
1067 /// constructTypeDIE - Construct type DIE from DICompositeType.
1068 void CompileUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
1069 // Get core information.
1070 StringRef Name = CTy.getName();
1072 uint64_t Size = CTy.getSizeInBits() >> 3;
1073 uint16_t Tag = Buffer.getTag();
1076 case dwarf::DW_TAG_array_type:
1077 constructArrayTypeDIE(Buffer, &CTy);
1079 case dwarf::DW_TAG_enumeration_type: {
1080 DIArray Elements = CTy.getTypeArray();
1082 // Add enumerators to enumeration type.
1083 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1084 DIE *ElemDie = NULL;
1085 DIDescriptor Enum(Elements.getElement(i));
1086 if (Enum.isEnumerator())
1087 ElemDie = constructEnumTypeDIE(DIEnumerator(Enum), Buffer);
1089 DIType DTy = resolve(CTy.getTypeDerivedFrom());
1091 addType(&Buffer, DTy);
1092 addFlag(&Buffer, dwarf::DW_AT_enum_class);
1096 case dwarf::DW_TAG_subroutine_type: {
1097 // Add return type. A void return won't have a type.
1098 DIArray Elements = CTy.getTypeArray();
1099 DIDescriptor RTy = Elements.getElement(0);
1101 addType(&Buffer, DIType(RTy));
1103 bool isPrototyped = true;
1105 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
1106 DIDescriptor Ty = Elements.getElement(i);
1107 if (Ty.isUnspecifiedParameter()) {
1108 DIE *Arg = new DIE(dwarf::DW_TAG_unspecified_parameters);
1109 Buffer.addChild(Arg);
1110 isPrototyped = false;
1112 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
1113 addType(Arg, DIType(Ty));
1114 if (DIType(Ty).isArtificial())
1115 addFlag(Arg, dwarf::DW_AT_artificial);
1116 Buffer.addChild(Arg);
1119 // Add prototype flag if we're dealing with a C language and the
1120 // function has been prototyped.
1121 uint16_t Language = DICompileUnit(Node).getLanguage();
1123 (Language == dwarf::DW_LANG_C89 ||
1124 Language == dwarf::DW_LANG_C99 ||
1125 Language == dwarf::DW_LANG_ObjC))
1126 addFlag(&Buffer, dwarf::DW_AT_prototyped);
1129 case dwarf::DW_TAG_structure_type:
1130 case dwarf::DW_TAG_union_type:
1131 case dwarf::DW_TAG_class_type: {
1132 // Add elements to structure type.
1133 DIArray Elements = CTy.getTypeArray();
1134 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1135 DIDescriptor Element = Elements.getElement(i);
1136 DIE *ElemDie = NULL;
1137 if (Element.isSubprogram()) {
1138 DISubprogram SP(Element);
1139 ElemDie = getOrCreateSubprogramDIE(DISubprogram(Element));
1140 if (SP.isProtected())
1141 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1142 dwarf::DW_ACCESS_protected);
1143 else if (SP.isPrivate())
1144 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1145 dwarf::DW_ACCESS_private);
1147 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1148 dwarf::DW_ACCESS_public);
1149 if (SP.isExplicit())
1150 addFlag(ElemDie, dwarf::DW_AT_explicit);
1151 } else if (Element.isDerivedType()) {
1152 DIDerivedType DDTy(Element);
1153 if (DDTy.getTag() == dwarf::DW_TAG_friend) {
1154 ElemDie = new DIE(dwarf::DW_TAG_friend);
1155 addType(ElemDie, resolve(DDTy.getTypeDerivedFrom()),
1156 dwarf::DW_AT_friend);
1157 Buffer.addChild(ElemDie);
1158 } else if (DDTy.isStaticMember()) {
1159 ElemDie = getOrCreateStaticMemberDIE(DDTy);
1161 ElemDie = createMemberDIE(DDTy, Buffer);
1163 } else if (Element.isObjCProperty()) {
1164 DIObjCProperty Property(Element);
1165 ElemDie = new DIE(Property.getTag());
1166 StringRef PropertyName = Property.getObjCPropertyName();
1167 addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
1168 addType(ElemDie, Property.getType());
1169 addSourceLine(ElemDie, Property);
1170 StringRef GetterName = Property.getObjCPropertyGetterName();
1171 if (!GetterName.empty())
1172 addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
1173 StringRef SetterName = Property.getObjCPropertySetterName();
1174 if (!SetterName.empty())
1175 addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
1176 unsigned PropertyAttributes = 0;
1177 if (Property.isReadOnlyObjCProperty())
1178 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readonly;
1179 if (Property.isReadWriteObjCProperty())
1180 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readwrite;
1181 if (Property.isAssignObjCProperty())
1182 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_assign;
1183 if (Property.isRetainObjCProperty())
1184 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_retain;
1185 if (Property.isCopyObjCProperty())
1186 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_copy;
1187 if (Property.isNonAtomicObjCProperty())
1188 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_nonatomic;
1189 if (PropertyAttributes)
1190 addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, 0,
1191 PropertyAttributes);
1193 DIEEntry *Entry = getDIEEntry(Element);
1195 Entry = createDIEEntry(ElemDie);
1196 insertDIEEntry(Element, Entry);
1198 Buffer.addChild(ElemDie);
1203 if (CTy.isAppleBlockExtension())
1204 addFlag(&Buffer, dwarf::DW_AT_APPLE_block);
1206 DICompositeType ContainingType(resolve(CTy.getContainingType()));
1207 if (DIDescriptor(ContainingType).isCompositeType())
1208 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
1209 getOrCreateTypeDIE(DIType(ContainingType)));
1211 if (CTy.isObjcClassComplete())
1212 addFlag(&Buffer, dwarf::DW_AT_APPLE_objc_complete_type);
1214 // Add template parameters to a class, structure or union types.
1215 // FIXME: The support isn't in the metadata for this yet.
1216 if (Tag == dwarf::DW_TAG_class_type ||
1217 Tag == dwarf::DW_TAG_structure_type ||
1218 Tag == dwarf::DW_TAG_union_type)
1219 addTemplateParams(Buffer, CTy.getTemplateParams());
1227 // Add name if not anonymous or intermediate type.
1229 addString(&Buffer, dwarf::DW_AT_name, Name);
1231 if (Tag == dwarf::DW_TAG_enumeration_type ||
1232 Tag == dwarf::DW_TAG_class_type ||
1233 Tag == dwarf::DW_TAG_structure_type ||
1234 Tag == dwarf::DW_TAG_union_type) {
1235 // Add size if non-zero (derived types might be zero-sized.)
1236 // TODO: Do we care about size for enum forward declarations?
1238 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
1239 else if (!CTy.isForwardDecl())
1240 // Add zero size if it is not a forward declaration.
1241 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, 0);
1243 // If we're a forward decl, say so.
1244 if (CTy.isForwardDecl())
1245 addFlag(&Buffer, dwarf::DW_AT_declaration);
1247 // Add source line info if available.
1248 if (!CTy.isForwardDecl())
1249 addSourceLine(&Buffer, CTy);
1251 // No harm in adding the runtime language to the declaration.
1252 unsigned RLang = CTy.getRunTimeLang();
1254 addUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class,
1255 dwarf::DW_FORM_data1, RLang);
1257 // If this is a type applicable to a type unit it then add it to the
1258 // list of types we'll compute a hash for later.
1259 if (shouldCreateTypeUnit(CTy, DD))
1260 DD->addTypeUnitType(&Buffer);
1263 /// getOrCreateTemplateTypeParameterDIE - Find existing DIE or create new DIE
1264 /// for the given DITemplateTypeParameter.
1266 CompileUnit::getOrCreateTemplateTypeParameterDIE(DITemplateTypeParameter TP,
1268 DIE *ParamDIE = getDIE(TP);
1272 ParamDIE = new DIE(dwarf::DW_TAG_template_type_parameter);
1273 Buffer.addChild(ParamDIE);
1274 // Add the type if it exists, it could be void and therefore no type.
1276 addType(ParamDIE, resolve(TP.getType()));
1277 if (!TP.getName().empty())
1278 addString(ParamDIE, dwarf::DW_AT_name, TP.getName());
1282 /// getOrCreateTemplateValueParameterDIE - Find existing DIE or create new DIE
1283 /// for the given DITemplateValueParameter.
1285 CompileUnit::getOrCreateTemplateValueParameterDIE(DITemplateValueParameter VP,
1287 DIE *ParamDIE = getDIE(VP);
1291 ParamDIE = new DIE(VP.getTag());
1292 Buffer.addChild(ParamDIE);
1294 // Add the type if there is one, template template and template parameter
1295 // packs will not have a type.
1297 addType(ParamDIE, resolve(VP.getType()));
1298 if (!VP.getName().empty())
1299 addString(ParamDIE, dwarf::DW_AT_name, VP.getName());
1300 if (Value *Val = VP.getValue()) {
1301 if (ConstantInt *CI = dyn_cast<ConstantInt>(Val))
1302 addConstantValue(ParamDIE, CI,
1303 isUnsignedDIType(DD, resolve(VP.getType())));
1304 else if (GlobalValue *GV = dyn_cast<GlobalValue>(Val)) {
1305 // For declaration non-type template parameters (such as global values and
1307 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1308 addOpAddress(Block, Asm->Mang->getSymbol(GV));
1309 // Emit DW_OP_stack_value to use the address as the immediate value of the
1310 // parameter, rather than a pointer to it.
1311 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
1312 addBlock(ParamDIE, dwarf::DW_AT_location, 0, Block);
1313 } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_template_param) {
1314 assert(isa<MDString>(Val));
1315 addString(ParamDIE, dwarf::DW_AT_GNU_template_name,
1316 cast<MDString>(Val)->getString());
1317 } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_parameter_pack) {
1318 assert(isa<MDNode>(Val));
1319 DIArray A(cast<MDNode>(Val));
1320 addTemplateParams(*ParamDIE, A);
1327 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
1328 DIE *CompileUnit::getOrCreateNameSpace(DINameSpace NS) {
1329 DIE *NDie = getDIE(NS);
1332 NDie = new DIE(dwarf::DW_TAG_namespace);
1333 insertDIE(NS, NDie);
1334 if (!NS.getName().empty()) {
1335 addString(NDie, dwarf::DW_AT_name, NS.getName());
1336 addAccelNamespace(NS.getName(), NDie);
1337 addGlobalName(NS.getName(), NDie, NS.getContext());
1339 addAccelNamespace("(anonymous namespace)", NDie);
1340 addSourceLine(NDie, NS);
1341 addToContextOwner(NDie, NS.getContext());
1345 /// getOrCreateSubprogramDIE - Create new DIE using SP.
1346 DIE *CompileUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
1347 // Construct the context before querying for the existence of the DIE in case
1348 // such construction creates the DIE (as is the case for member function
1350 DIE *ContextDIE = getOrCreateContextDIE(resolve(SP.getContext()));
1352 ContextDIE = CUDie.get();
1354 DIE *SPDie = getDIE(SP);
1358 SPDie = new DIE(dwarf::DW_TAG_subprogram);
1360 // DW_TAG_inlined_subroutine may refer to this DIE.
1361 insertDIE(SP, SPDie);
1363 DISubprogram SPDecl = SP.getFunctionDeclaration();
1364 DIE *DeclDie = NULL;
1365 if (SPDecl.isSubprogram()) {
1366 DeclDie = getOrCreateSubprogramDIE(SPDecl);
1369 // Add function template parameters.
1370 addTemplateParams(*SPDie, SP.getTemplateParams());
1372 // If this DIE is going to refer declaration info using AT_specification
1373 // then there is no need to add other attributes.
1375 // Refer function declaration directly.
1376 addDIEEntry(SPDie, dwarf::DW_AT_specification, DeclDie);
1378 // Add subprogram definitions to the CU die directly.
1384 // Add to context owner.
1385 ContextDIE->addChild(SPDie);
1387 // Add the linkage name if we have one.
1388 StringRef LinkageName = SP.getLinkageName();
1389 if (!LinkageName.empty())
1390 addString(SPDie, dwarf::DW_AT_MIPS_linkage_name,
1391 GlobalValue::getRealLinkageName(LinkageName));
1393 // Constructors and operators for anonymous aggregates do not have names.
1394 if (!SP.getName().empty())
1395 addString(SPDie, dwarf::DW_AT_name, SP.getName());
1397 addSourceLine(SPDie, SP);
1399 // Add the prototype if we have a prototype and we have a C like
1401 uint16_t Language = DICompileUnit(Node).getLanguage();
1402 if (SP.isPrototyped() &&
1403 (Language == dwarf::DW_LANG_C89 ||
1404 Language == dwarf::DW_LANG_C99 ||
1405 Language == dwarf::DW_LANG_ObjC))
1406 addFlag(SPDie, dwarf::DW_AT_prototyped);
1408 // Add Return Type. A void return type will not have a type.
1409 DICompositeType SPTy = SP.getType();
1410 assert(SPTy.getTag() == dwarf::DW_TAG_subroutine_type &&
1411 "the type of a subprogram should be a subroutine");
1413 DIArray Args = SPTy.getTypeArray();
1414 if (Args.getElement(0))
1415 addType(SPDie, DIType(Args.getElement(0)));
1417 unsigned VK = SP.getVirtuality();
1419 addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
1420 DIEBlock *Block = getDIEBlock();
1421 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1422 addUInt(Block, 0, dwarf::DW_FORM_udata, SP.getVirtualIndex());
1423 addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, 0, Block);
1424 ContainingTypeMap.insert(std::make_pair(SPDie,
1425 resolve(SP.getContainingType())));
1428 if (!SP.isDefinition()) {
1429 addFlag(SPDie, dwarf::DW_AT_declaration);
1431 // Add arguments. Do not add arguments for subprogram definition. They will
1432 // be handled while processing variables.
1433 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
1434 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
1435 DIType ATy = DIType(Args.getElement(i));
1437 if (ATy.isArtificial())
1438 addFlag(Arg, dwarf::DW_AT_artificial);
1439 SPDie->addChild(Arg);
1443 if (SP.isArtificial())
1444 addFlag(SPDie, dwarf::DW_AT_artificial);
1446 if (!SP.isLocalToUnit())
1447 addFlag(SPDie, dwarf::DW_AT_external);
1449 if (SP.isOptimized())
1450 addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);
1452 if (unsigned isa = Asm->getISAEncoding()) {
1453 addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
1459 // Return const expression if value is a GEP to access merged global
1461 // i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
1462 static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
1463 const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
1464 if (!CE || CE->getNumOperands() != 3 ||
1465 CE->getOpcode() != Instruction::GetElementPtr)
1468 // First operand points to a global struct.
1469 Value *Ptr = CE->getOperand(0);
1470 if (!isa<GlobalValue>(Ptr) ||
1471 !isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
1474 // Second operand is zero.
1475 const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
1476 if (!CI || !CI->isZero())
1479 // Third operand is offset.
1480 if (!isa<ConstantInt>(CE->getOperand(2)))
1486 /// createGlobalVariableDIE - create global variable DIE.
1487 void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
1488 // Check for pre-existence.
1492 DIGlobalVariable GV(N);
1493 if (!GV.isGlobalVariable())
1496 DIScope GVContext = GV.getContext();
1497 DIType GTy = GV.getType();
1499 // If this is a static data member definition, some attributes belong
1500 // to the declaration DIE.
1501 DIE *VariableDIE = NULL;
1502 bool IsStaticMember = false;
1503 DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration();
1504 if (SDMDecl.Verify()) {
1505 assert(SDMDecl.isStaticMember() && "Expected static member decl");
1506 // We need the declaration DIE that is in the static member's class.
1507 VariableDIE = getOrCreateStaticMemberDIE(SDMDecl);
1508 IsStaticMember = true;
1511 // If this is not a static data member definition, create the variable
1512 // DIE and add the initial set of attributes to it.
1514 VariableDIE = new DIE(GV.getTag());
1516 insertDIE(N, VariableDIE);
1518 // Add name and type.
1519 addString(VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
1520 addType(VariableDIE, GTy);
1522 // Add scoping info.
1523 if (!GV.isLocalToUnit())
1524 addFlag(VariableDIE, dwarf::DW_AT_external);
1526 // Add line number info.
1527 addSourceLine(VariableDIE, GV);
1528 // Add to context owner.
1529 addToContextOwner(VariableDIE, GVContext);
1533 bool addToAccelTable = false;
1534 DIE *VariableSpecDIE = NULL;
1535 bool isGlobalVariable = GV.getGlobal() != NULL;
1536 if (isGlobalVariable) {
1537 addToAccelTable = true;
1538 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1539 const MCSymbol *Sym = Asm->Mang->getSymbol(GV.getGlobal());
1540 if (GV.getGlobal()->isThreadLocal()) {
1541 // FIXME: Make this work with -gsplit-dwarf.
1542 unsigned PointerSize = Asm->getDataLayout().getPointerSize();
1543 assert((PointerSize == 4 || PointerSize == 8) &&
1544 "Add support for other sizes if necessary");
1545 const MCExpr *Expr =
1546 Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym);
1547 // Based on GCC's support for TLS:
1548 if (!DD->useSplitDwarf()) {
1549 // 1) Start with a constNu of the appropriate pointer size
1550 addUInt(Block, 0, dwarf::DW_FORM_data1,
1551 PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
1552 // 2) containing the (relocated) offset of the TLS variable
1553 // within the module's TLS block.
1554 addExpr(Block, 0, dwarf::DW_FORM_udata, Expr);
1556 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
1557 addUInt(Block, 0, dwarf::DW_FORM_udata, DU->getAddrPoolIndex(Expr));
1559 // 3) followed by a custom OP to make the debugger do a TLS lookup.
1560 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
1562 addOpAddress(Block, Sym);
1563 // Do not create specification DIE if context is either compile unit
1565 if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
1566 !GVContext.isFile() && !DD->isSubprogramContext(GVContext)) {
1567 // Create specification DIE.
1568 VariableSpecDIE = new DIE(dwarf::DW_TAG_variable);
1569 addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification, VariableDIE);
1570 addBlock(VariableSpecDIE, dwarf::DW_AT_location, 0, Block);
1571 // A static member's declaration is already flagged as such.
1572 if (!SDMDecl.Verify())
1573 addFlag(VariableDIE, dwarf::DW_AT_declaration);
1574 addDie(VariableSpecDIE);
1576 addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
1578 // Add the linkage name.
1579 StringRef LinkageName = GV.getLinkageName();
1580 if (!LinkageName.empty())
1581 // From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
1582 // TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
1584 addString(IsStaticMember && VariableSpecDIE ?
1585 VariableSpecDIE : VariableDIE, dwarf::DW_AT_MIPS_linkage_name,
1586 GlobalValue::getRealLinkageName(LinkageName));
1587 } else if (const ConstantInt *CI =
1588 dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
1589 // AT_const_value was added when the static member was created. To avoid
1590 // emitting AT_const_value multiple times, we only add AT_const_value when
1591 // it is not a static member.
1592 if (!IsStaticMember)
1593 addConstantValue(VariableDIE, CI, isUnsignedDIType(DD, GTy));
1594 } else if (const ConstantExpr *CE = getMergedGlobalExpr(N->getOperand(11))) {
1595 addToAccelTable = true;
1596 // GV is a merged global.
1597 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1598 Value *Ptr = CE->getOperand(0);
1599 addOpAddress(Block, Asm->Mang->getSymbol(cast<GlobalValue>(Ptr)));
1600 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1601 SmallVector<Value*, 3> Idx(CE->op_begin()+1, CE->op_end());
1602 addUInt(Block, 0, dwarf::DW_FORM_udata,
1603 Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx));
1604 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1605 addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
1608 if (addToAccelTable) {
1609 DIE *AddrDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
1610 addAccelName(GV.getName(), AddrDIE);
1612 // If the linkage name is different than the name, go ahead and output
1613 // that as well into the name table.
1614 if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
1615 addAccelName(GV.getLinkageName(), AddrDIE);
1618 if (!GV.isLocalToUnit())
1619 addGlobalName(GV.getName(), VariableSpecDIE ? VariableSpecDIE : VariableDIE,
1623 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
1624 void CompileUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR,
1626 DIE *DW_Subrange = new DIE(dwarf::DW_TAG_subrange_type);
1627 addDIEEntry(DW_Subrange, dwarf::DW_AT_type, IndexTy);
1629 // The LowerBound value defines the lower bounds which is typically zero for
1630 // C/C++. The Count value is the number of elements. Values are 64 bit. If
1631 // Count == -1 then the array is unbounded and we do not emit
1632 // DW_AT_lower_bound and DW_AT_upper_bound attributes. If LowerBound == 0 and
1633 // Count == 0, then the array has zero elements in which case we do not emit
1635 int64_t LowerBound = SR.getLo();
1636 int64_t DefaultLowerBound = getDefaultLowerBound();
1637 int64_t Count = SR.getCount();
1639 if (DefaultLowerBound == -1 || LowerBound != DefaultLowerBound)
1640 addUInt(DW_Subrange, dwarf::DW_AT_lower_bound, 0, LowerBound);
1642 if (Count != -1 && Count != 0)
1643 // FIXME: An unbounded array should reference the expression that defines
1645 addUInt(DW_Subrange, dwarf::DW_AT_upper_bound, 0, LowerBound + Count - 1);
1647 Buffer.addChild(DW_Subrange);
1650 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
1651 void CompileUnit::constructArrayTypeDIE(DIE &Buffer,
1652 DICompositeType *CTy) {
1653 if (CTy->isVector())
1654 addFlag(&Buffer, dwarf::DW_AT_GNU_vector);
1656 // Emit the element type.
1657 addType(&Buffer, resolve(CTy->getTypeDerivedFrom()));
1659 // Get an anonymous type for index type.
1660 // FIXME: This type should be passed down from the front end
1661 // as different languages may have different sizes for indexes.
1662 DIE *IdxTy = getIndexTyDie();
1664 // Construct an anonymous type for index type.
1665 IdxTy = new DIE(dwarf::DW_TAG_base_type);
1666 addString(IdxTy, dwarf::DW_AT_name, "int");
1667 addUInt(IdxTy, dwarf::DW_AT_byte_size, 0, sizeof(int32_t));
1668 addUInt(IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1669 dwarf::DW_ATE_signed);
1671 setIndexTyDie(IdxTy);
1674 // Add subranges to array type.
1675 DIArray Elements = CTy->getTypeArray();
1676 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1677 DIDescriptor Element = Elements.getElement(i);
1678 if (Element.getTag() == dwarf::DW_TAG_subrange_type)
1679 constructSubrangeDIE(Buffer, DISubrange(Element), IdxTy);
1683 /// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
1684 DIE *CompileUnit::constructEnumTypeDIE(DIEnumerator ETy, DIE &Buffer) {
1685 DIE *Enumerator = new DIE(dwarf::DW_TAG_enumerator);
1686 Buffer.addChild(Enumerator);
1687 StringRef Name = ETy.getName();
1688 addString(Enumerator, dwarf::DW_AT_name, Name);
1689 int64_t Value = ETy.getEnumValue();
1690 addSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, Value);
1694 /// constructContainingTypeDIEs - Construct DIEs for types that contain
1696 void CompileUnit::constructContainingTypeDIEs() {
1697 for (DenseMap<DIE *, const MDNode *>::iterator CI = ContainingTypeMap.begin(),
1698 CE = ContainingTypeMap.end(); CI != CE; ++CI) {
1699 DIE *SPDie = CI->first;
1700 const MDNode *N = CI->second;
1702 DIE *NDie = getDIE(N);
1703 if (!NDie) continue;
1704 addDIEEntry(SPDie, dwarf::DW_AT_containing_type, NDie);
1708 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
1709 DIE *CompileUnit::constructVariableDIE(DbgVariable *DV,
1710 bool isScopeAbstract) {
1711 StringRef Name = DV->getName();
1713 // Define variable debug information entry.
1714 DIE *VariableDie = new DIE(DV->getTag());
1715 DbgVariable *AbsVar = DV->getAbstractVariable();
1716 DIE *AbsDIE = AbsVar ? AbsVar->getDIE() : NULL;
1718 addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin, AbsDIE);
1721 addString(VariableDie, dwarf::DW_AT_name, Name);
1722 addSourceLine(VariableDie, DV->getVariable());
1723 addType(VariableDie, DV->getType());
1726 if (DV->isArtificial())
1727 addFlag(VariableDie, dwarf::DW_AT_artificial);
1729 if (isScopeAbstract) {
1730 DV->setDIE(VariableDie);
1734 // Add variable address.
1736 unsigned Offset = DV->getDotDebugLocOffset();
1737 if (Offset != ~0U) {
1738 addLabel(VariableDie, dwarf::DW_AT_location, dwarf::DW_FORM_data4,
1739 Asm->GetTempSymbol("debug_loc", Offset));
1740 DV->setDIE(VariableDie);
1744 // Check if variable is described by a DBG_VALUE instruction.
1745 if (const MachineInstr *DVInsn = DV->getMInsn()) {
1746 assert(DVInsn->getNumOperands() == 3);
1747 if (DVInsn->getOperand(0).isReg()) {
1748 const MachineOperand RegOp = DVInsn->getOperand(0);
1749 // If the second operand is an immediate, this is an indirect value.
1750 if (DVInsn->getOperand(1).isImm()) {
1751 MachineLocation Location(RegOp.getReg(), DVInsn->getOperand(1).getImm());
1752 addVariableAddress(*DV, VariableDie, Location);
1753 } else if (RegOp.getReg())
1754 addVariableAddress(*DV, VariableDie, MachineLocation(RegOp.getReg()));
1755 } else if (DVInsn->getOperand(0).isImm())
1756 addConstantValue(VariableDie, DVInsn->getOperand(0), DV->getType());
1757 else if (DVInsn->getOperand(0).isFPImm())
1758 addConstantFPValue(VariableDie, DVInsn->getOperand(0));
1759 else if (DVInsn->getOperand(0).isCImm())
1760 addConstantValue(VariableDie, DVInsn->getOperand(0).getCImm(),
1761 isUnsignedDIType(DD, DV->getType()));
1763 DV->setDIE(VariableDie);
1766 // .. else use frame index.
1767 int FI = DV->getFrameIndex();
1769 unsigned FrameReg = 0;
1770 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
1772 TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
1773 MachineLocation Location(FrameReg, Offset);
1774 addVariableAddress(*DV, VariableDie, Location);
1778 DV->setDIE(VariableDie);
1782 /// createMemberDIE - Create new member DIE.
1783 DIE *CompileUnit::createMemberDIE(DIDerivedType DT, DIE &Buffer) {
1784 DIE *MemberDie = new DIE(DT.getTag());
1785 Buffer.addChild(MemberDie);
1786 StringRef Name = DT.getName();
1788 addString(MemberDie, dwarf::DW_AT_name, Name);
1790 addType(MemberDie, resolve(DT.getTypeDerivedFrom()));
1792 addSourceLine(MemberDie, DT);
1794 DIEBlock *MemLocationDie = new (DIEValueAllocator) DIEBlock();
1795 addUInt(MemLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
1797 uint64_t Size = DT.getSizeInBits();
1798 uint64_t FieldSize = getBaseTypeSize(DD, DT);
1800 if (Size != FieldSize) {
1802 addUInt(MemberDie, dwarf::DW_AT_byte_size, 0,
1803 getBaseTypeSize(DD, DT)>>3);
1804 addUInt(MemberDie, dwarf::DW_AT_bit_size, 0, DT.getSizeInBits());
1806 uint64_t Offset = DT.getOffsetInBits();
1807 uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
1808 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1809 uint64_t FieldOffset = (HiMark - FieldSize);
1810 Offset -= FieldOffset;
1812 // Maybe we need to work from the other end.
1813 if (Asm->getDataLayout().isLittleEndian())
1814 Offset = FieldSize - (Offset + Size);
1815 addUInt(MemberDie, dwarf::DW_AT_bit_offset, 0, Offset);
1817 // Here WD_AT_data_member_location points to the anonymous
1818 // field that includes this bit field.
1819 addUInt(MemLocationDie, 0, dwarf::DW_FORM_udata, FieldOffset >> 3);
1822 // This is not a bitfield.
1823 addUInt(MemLocationDie, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits() >> 3);
1825 if (DT.getTag() == dwarf::DW_TAG_inheritance
1826 && DT.isVirtual()) {
1828 // For C++, virtual base classes are not at fixed offset. Use following
1829 // expression to extract appropriate offset from vtable.
1830 // BaseAddr = ObAddr + *((*ObAddr) - Offset)
1832 DIEBlock *VBaseLocationDie = new (DIEValueAllocator) DIEBlock();
1833 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
1834 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1835 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1836 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits());
1837 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
1838 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1839 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1841 addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0,
1844 addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0, MemLocationDie);
1846 if (DT.isProtected())
1847 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1848 dwarf::DW_ACCESS_protected);
1849 else if (DT.isPrivate())
1850 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1851 dwarf::DW_ACCESS_private);
1852 // Otherwise C++ member and base classes are considered public.
1854 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1855 dwarf::DW_ACCESS_public);
1857 addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1,
1858 dwarf::DW_VIRTUALITY_virtual);
1860 // Objective-C properties.
1861 if (MDNode *PNode = DT.getObjCProperty())
1862 if (DIEEntry *PropertyDie = getDIEEntry(PNode))
1863 MemberDie->addValue(dwarf::DW_AT_APPLE_property, dwarf::DW_FORM_ref4,
1866 if (DT.isArtificial())
1867 addFlag(MemberDie, dwarf::DW_AT_artificial);
1872 /// getOrCreateStaticMemberDIE - Create new DIE for C++ static member.
1873 DIE *CompileUnit::getOrCreateStaticMemberDIE(const DIDerivedType DT) {
1877 // Construct the context before querying for the existence of the DIE in case
1878 // such construction creates the DIE.
1879 DIE *ContextDIE = getOrCreateContextDIE(resolve(DT.getContext()));
1880 assert(ContextDIE && "Static member should belong to a non-CU context.");
1882 DIE *StaticMemberDIE = getDIE(DT);
1883 if (StaticMemberDIE)
1884 return StaticMemberDIE;
1886 StaticMemberDIE = new DIE(DT.getTag());
1887 // Add to context owner.
1888 ContextDIE->addChild(StaticMemberDIE);
1890 DIType Ty = resolve(DT.getTypeDerivedFrom());
1892 addString(StaticMemberDIE, dwarf::DW_AT_name, DT.getName());
1893 addType(StaticMemberDIE, Ty);
1894 addSourceLine(StaticMemberDIE, DT);
1895 addFlag(StaticMemberDIE, dwarf::DW_AT_external);
1896 addFlag(StaticMemberDIE, dwarf::DW_AT_declaration);
1898 // FIXME: We could omit private if the parent is a class_type, and
1899 // public if the parent is something else.
1900 if (DT.isProtected())
1901 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1902 dwarf::DW_ACCESS_protected);
1903 else if (DT.isPrivate())
1904 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1905 dwarf::DW_ACCESS_private);
1907 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1908 dwarf::DW_ACCESS_public);
1910 if (const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(DT.getConstant()))
1911 addConstantValue(StaticMemberDIE, CI, isUnsignedDIType(DD, Ty));
1912 if (const ConstantFP *CFP = dyn_cast_or_null<ConstantFP>(DT.getConstant()))
1913 addConstantFPValue(StaticMemberDIE, CFP);
1915 insertDIE(DT, StaticMemberDIE);
1916 return StaticMemberDIE;