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 writing dwarf compile unit.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "dwarfdebug"
16 #include "DwarfCompileUnit.h"
17 #include "DwarfDebug.h"
18 #include "llvm/Constants.h"
19 #include "llvm/GlobalVariable.h"
20 #include "llvm/Instructions.h"
21 #include "llvm/Analysis/DIBuilder.h"
22 #include "llvm/Target/Mangler.h"
23 #include "llvm/Target/TargetData.h"
24 #include "llvm/Target/TargetFrameLowering.h"
25 #include "llvm/Target/TargetMachine.h"
26 #include "llvm/Target/TargetRegisterInfo.h"
27 #include "llvm/ADT/APFloat.h"
28 #include "llvm/Support/ErrorHandling.h"
32 /// CompileUnit - Compile unit constructor.
33 CompileUnit::CompileUnit(unsigned I, DIE *D, AsmPrinter *A, DwarfDebug *DW)
34 : ID(I), CUDie(D), Asm(A), DD(DW), IndexTyDie(0) {
35 DIEIntegerOne = new (DIEValueAllocator) DIEInteger(1);
38 /// ~CompileUnit - Destructor for compile unit.
39 CompileUnit::~CompileUnit() {
40 for (unsigned j = 0, M = DIEBlocks.size(); j < M; ++j)
41 DIEBlocks[j]->~DIEBlock();
44 /// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
45 /// information entry.
46 DIEEntry *CompileUnit::createDIEEntry(DIE *Entry) {
47 DIEEntry *Value = new (DIEValueAllocator) DIEEntry(Entry);
51 /// addUInt - Add an unsigned integer attribute data and value.
53 void CompileUnit::addUInt(DIE *Die, unsigned Attribute,
54 unsigned Form, uint64_t Integer) {
55 if (!Form) Form = DIEInteger::BestForm(false, Integer);
56 DIEValue *Value = Integer == 1 ?
57 DIEIntegerOne : new (DIEValueAllocator) DIEInteger(Integer);
58 Die->addValue(Attribute, Form, Value);
61 /// addSInt - Add an signed integer attribute data and value.
63 void CompileUnit::addSInt(DIE *Die, unsigned Attribute,
64 unsigned Form, int64_t Integer) {
65 if (!Form) Form = DIEInteger::BestForm(true, Integer);
66 DIEValue *Value = new (DIEValueAllocator) DIEInteger(Integer);
67 Die->addValue(Attribute, Form, Value);
70 /// addString - Add a string attribute data and value. DIEString only
71 /// keeps string reference.
72 void CompileUnit::addString(DIE *Die, unsigned Attribute, unsigned Form,
74 DIEValue *Value = new (DIEValueAllocator) DIEString(String);
75 Die->addValue(Attribute, Form, Value);
78 /// addLabel - Add a Dwarf label attribute data and value.
80 void CompileUnit::addLabel(DIE *Die, unsigned Attribute, unsigned Form,
81 const MCSymbol *Label) {
82 DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
83 Die->addValue(Attribute, Form, Value);
86 /// addDelta - Add a label delta attribute data and value.
88 void CompileUnit::addDelta(DIE *Die, unsigned Attribute, unsigned Form,
89 const MCSymbol *Hi, const MCSymbol *Lo) {
90 DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo);
91 Die->addValue(Attribute, Form, Value);
94 /// addDIEEntry - Add a DIE attribute data and value.
96 void CompileUnit::addDIEEntry(DIE *Die, unsigned Attribute, unsigned Form,
98 Die->addValue(Attribute, Form, createDIEEntry(Entry));
102 /// addBlock - Add block data.
104 void CompileUnit::addBlock(DIE *Die, unsigned Attribute, unsigned Form,
106 Block->ComputeSize(Asm);
107 DIEBlocks.push_back(Block); // Memoize so we can call the destructor later on.
108 Die->addValue(Attribute, Block->BestForm(), Block);
111 /// addSourceLine - Add location information to specified debug information
113 void CompileUnit::addSourceLine(DIE *Die, DIVariable V) {
118 unsigned Line = V.getLineNumber();
121 unsigned FileID = DD->GetOrCreateSourceID(V.getContext().getFilename(),
122 V.getContext().getDirectory());
123 assert(FileID && "Invalid file id");
124 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
125 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
128 /// addSourceLine - Add location information to specified debug information
130 void CompileUnit::addSourceLine(DIE *Die, DIGlobalVariable G) {
131 // Verify global variable.
135 unsigned Line = G.getLineNumber();
138 unsigned FileID = DD->GetOrCreateSourceID(G.getFilename(),
140 assert(FileID && "Invalid file id");
141 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
142 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
145 /// addSourceLine - Add location information to specified debug information
147 void CompileUnit::addSourceLine(DIE *Die, DISubprogram SP) {
148 // Verify subprogram.
151 // If the line number is 0, don't add it.
152 if (SP.getLineNumber() == 0)
155 unsigned Line = SP.getLineNumber();
156 if (!SP.getContext().Verify())
158 unsigned FileID = DD->GetOrCreateSourceID(SP.getFilename(), SP.getDirectory());
159 assert(FileID && "Invalid file id");
160 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
161 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
164 /// addSourceLine - Add location information to specified debug information
166 void CompileUnit::addSourceLine(DIE *Die, DIType Ty) {
171 unsigned Line = Ty.getLineNumber();
172 if (Line == 0 || !Ty.getContext().Verify())
174 unsigned FileID = DD->GetOrCreateSourceID(Ty.getFilename(), Ty.getDirectory());
175 assert(FileID && "Invalid file id");
176 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
177 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
180 /// addSourceLine - Add location information to specified debug information
182 void CompileUnit::addSourceLine(DIE *Die, DINameSpace NS) {
187 unsigned Line = NS.getLineNumber();
190 StringRef FN = NS.getFilename();
192 unsigned FileID = DD->GetOrCreateSourceID(FN, NS.getDirectory());
193 assert(FileID && "Invalid file id");
194 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
195 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
198 /// addVariableAddress - Add DW_AT_location attribute for a
199 /// DbgVariable based on provided MachineLocation.
200 void CompileUnit::addVariableAddress(DbgVariable *&DV, DIE *Die,
201 MachineLocation Location) {
202 if (DV->variableHasComplexAddress())
203 addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
204 else if (DV->isBlockByrefVariable())
205 addBlockByrefAddress(DV, Die, dwarf::DW_AT_location, Location);
207 addAddress(Die, dwarf::DW_AT_location, Location);
210 /// addRegisterOp - Add register operand.
211 void CompileUnit::addRegisterOp(DIE *TheDie, unsigned Reg) {
212 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
213 unsigned DWReg = RI->getDwarfRegNum(Reg, false);
215 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + DWReg);
217 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_regx);
218 addUInt(TheDie, 0, dwarf::DW_FORM_udata, DWReg);
222 /// addRegisterOffset - Add register offset.
223 void CompileUnit::addRegisterOffset(DIE *TheDie, unsigned Reg,
225 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
226 unsigned DWReg = RI->getDwarfRegNum(Reg, false);
227 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
228 if (Reg == TRI->getFrameRegister(*Asm->MF))
229 // If variable offset is based in frame register then use fbreg.
230 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_fbreg);
232 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + DWReg);
234 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
235 addUInt(TheDie, 0, dwarf::DW_FORM_udata, DWReg);
237 addSInt(TheDie, 0, dwarf::DW_FORM_sdata, Offset);
240 /// addAddress - Add an address attribute to a die based on the location
242 void CompileUnit::addAddress(DIE *Die, unsigned Attribute,
243 const MachineLocation &Location) {
244 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
246 if (Location.isReg())
247 addRegisterOp(Block, Location.getReg());
249 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
251 // Now attach the location information to the DIE.
252 addBlock(Die, Attribute, 0, Block);
255 /// addComplexAddress - Start with the address based on the location provided,
256 /// and generate the DWARF information necessary to find the actual variable
257 /// given the extra address information encoded in the DIVariable, starting from
258 /// the starting location. Add the DWARF information to the die.
260 void CompileUnit::addComplexAddress(DbgVariable *&DV, DIE *Die,
262 const MachineLocation &Location) {
263 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
264 unsigned N = DV->getNumAddrElements();
266 if (Location.isReg()) {
267 if (N >= 2 && DV->getAddrElement(0) == DIBuilder::OpPlus) {
268 // If first address element is OpPlus then emit
269 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
270 addRegisterOffset(Block, Location.getReg(), DV->getAddrElement(1));
273 addRegisterOp(Block, Location.getReg());
276 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
279 uint64_t Element = DV->getAddrElement(i);
280 if (Element == DIBuilder::OpPlus) {
281 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
282 addUInt(Block, 0, dwarf::DW_FORM_udata, DV->getAddrElement(++i));
283 } else if (Element == DIBuilder::OpDeref) {
284 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
285 } else llvm_unreachable("unknown DIBuilder Opcode");
288 // Now attach the location information to the DIE.
289 addBlock(Die, Attribute, 0, Block);
292 /* Byref variables, in Blocks, are declared by the programmer as "SomeType
293 VarName;", but the compiler creates a __Block_byref_x_VarName struct, and
294 gives the variable VarName either the struct, or a pointer to the struct, as
295 its type. This is necessary for various behind-the-scenes things the
296 compiler needs to do with by-reference variables in Blocks.
298 However, as far as the original *programmer* is concerned, the variable
299 should still have type 'SomeType', as originally declared.
301 The function getBlockByrefType dives into the __Block_byref_x_VarName
302 struct to find the original type of the variable, which is then assigned to
303 the variable's Debug Information Entry as its real type. So far, so good.
304 However now the debugger will expect the variable VarName to have the type
305 SomeType. So we need the location attribute for the variable to be an
306 expression that explains to the debugger how to navigate through the
307 pointers and struct to find the actual variable of type SomeType.
309 The following function does just that. We start by getting
310 the "normal" location for the variable. This will be the location
311 of either the struct __Block_byref_x_VarName or the pointer to the
312 struct __Block_byref_x_VarName.
314 The struct will look something like:
316 struct __Block_byref_x_VarName {
318 struct __Block_byref_x_VarName *forwarding;
319 ... <various other fields>
321 ... <maybe more fields>
324 If we are given the struct directly (as our starting point) we
325 need to tell the debugger to:
327 1). Add the offset of the forwarding field.
329 2). Follow that pointer to get the real __Block_byref_x_VarName
330 struct to use (the real one may have been copied onto the heap).
332 3). Add the offset for the field VarName, to find the actual variable.
334 If we started with a pointer to the struct, then we need to
335 dereference that pointer first, before the other steps.
336 Translating this into DWARF ops, we will need to append the following
337 to the current location description for the variable:
339 DW_OP_deref -- optional, if we start with a pointer
340 DW_OP_plus_uconst <forward_fld_offset>
342 DW_OP_plus_uconst <varName_fld_offset>
344 That is what this function does. */
346 /// addBlockByrefAddress - Start with the address based on the location
347 /// provided, and generate the DWARF information necessary to find the
348 /// actual Block variable (navigating the Block struct) based on the
349 /// starting location. Add the DWARF information to the die. For
350 /// more information, read large comment just above here.
352 void CompileUnit::addBlockByrefAddress(DbgVariable *&DV, DIE *Die,
354 const MachineLocation &Location) {
355 DIType Ty = DV->getType();
357 unsigned Tag = Ty.getTag();
358 bool isPointer = false;
360 StringRef varName = DV->getName();
362 if (Tag == dwarf::DW_TAG_pointer_type) {
363 DIDerivedType DTy = DIDerivedType(Ty);
364 TmpTy = DTy.getTypeDerivedFrom();
368 DICompositeType blockStruct = DICompositeType(TmpTy);
370 // Find the __forwarding field and the variable field in the __Block_byref
372 DIArray Fields = blockStruct.getTypeArray();
373 DIDescriptor varField = DIDescriptor();
374 DIDescriptor forwardingField = DIDescriptor();
376 for (unsigned i = 0, N = Fields.getNumElements(); i < N; ++i) {
377 DIDescriptor Element = Fields.getElement(i);
378 DIDerivedType DT = DIDerivedType(Element);
379 StringRef fieldName = DT.getName();
380 if (fieldName == "__forwarding")
381 forwardingField = Element;
382 else if (fieldName == varName)
386 // Get the offsets for the forwarding field and the variable field.
387 unsigned forwardingFieldOffset =
388 DIDerivedType(forwardingField).getOffsetInBits() >> 3;
389 unsigned varFieldOffset =
390 DIDerivedType(varField).getOffsetInBits() >> 3;
392 // Decode the original location, and use that as the start of the byref
393 // variable's location.
394 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
395 unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
396 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
398 if (Location.isReg()) {
400 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + Reg);
402 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_regx);
403 addUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
407 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
409 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
410 addUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
413 addUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset());
416 // If we started with a pointer to the __Block_byref... struct, then
417 // the first thing we need to do is dereference the pointer (DW_OP_deref).
419 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
421 // Next add the offset for the '__forwarding' field:
422 // DW_OP_plus_uconst ForwardingFieldOffset. Note there's no point in
423 // adding the offset if it's 0.
424 if (forwardingFieldOffset > 0) {
425 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
426 addUInt(Block, 0, dwarf::DW_FORM_udata, forwardingFieldOffset);
429 // Now dereference the __forwarding field to get to the real __Block_byref
430 // struct: DW_OP_deref.
431 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
433 // Now that we've got the real __Block_byref... struct, add the offset
434 // for the variable's field to get to the location of the actual variable:
435 // DW_OP_plus_uconst varFieldOffset. Again, don't add if it's 0.
436 if (varFieldOffset > 0) {
437 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
438 addUInt(Block, 0, dwarf::DW_FORM_udata, varFieldOffset);
441 // Now attach the location information to the DIE.
442 addBlock(Die, Attribute, 0, Block);
445 /// isTypeSigned - Return true if the type is signed.
446 static bool isTypeSigned(DIType Ty, int *SizeInBits) {
447 if (Ty.isDerivedType())
448 return isTypeSigned(DIDerivedType(Ty).getTypeDerivedFrom(), SizeInBits);
449 if (Ty.isBasicType())
450 if (DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed
451 || DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed_char) {
452 *SizeInBits = Ty.getSizeInBits();
458 /// addConstantValue - Add constant value entry in variable DIE.
459 bool CompileUnit::addConstantValue(DIE *Die, const MachineOperand &MO,
461 assert (MO.isImm() && "Invalid machine operand!");
462 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
464 bool SignedConstant = isTypeSigned(Ty, &SizeInBits);
465 unsigned Form = SignedConstant ? dwarf::DW_FORM_sdata : dwarf::DW_FORM_udata;
466 switch (SizeInBits) {
467 case 8: Form = dwarf::DW_FORM_data1; break;
468 case 16: Form = dwarf::DW_FORM_data2; break;
469 case 32: Form = dwarf::DW_FORM_data4; break;
470 case 64: Form = dwarf::DW_FORM_data8; break;
473 SignedConstant ? addSInt(Block, 0, Form, MO.getImm())
474 : addUInt(Block, 0, Form, MO.getImm());
476 addBlock(Die, dwarf::DW_AT_const_value, 0, Block);
480 /// addConstantFPValue - Add constant value entry in variable DIE.
481 bool CompileUnit::addConstantFPValue(DIE *Die, const MachineOperand &MO) {
482 assert (MO.isFPImm() && "Invalid machine operand!");
483 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
484 APFloat FPImm = MO.getFPImm()->getValueAPF();
486 // Get the raw data form of the floating point.
487 const APInt FltVal = FPImm.bitcastToAPInt();
488 const char *FltPtr = (const char*)FltVal.getRawData();
490 int NumBytes = FltVal.getBitWidth() / 8; // 8 bits per byte.
491 bool LittleEndian = Asm->getTargetData().isLittleEndian();
492 int Incr = (LittleEndian ? 1 : -1);
493 int Start = (LittleEndian ? 0 : NumBytes - 1);
494 int Stop = (LittleEndian ? NumBytes : -1);
496 // Output the constant to DWARF one byte at a time.
497 for (; Start != Stop; Start += Incr)
498 addUInt(Block, 0, dwarf::DW_FORM_data1,
499 (unsigned char)0xFF & FltPtr[Start]);
501 addBlock(Die, dwarf::DW_AT_const_value, 0, Block);
505 /// addConstantValue - Add constant value entry in variable DIE.
506 bool CompileUnit::addConstantValue(DIE *Die, const ConstantInt *CI,
508 unsigned CIBitWidth = CI->getBitWidth();
509 if (CIBitWidth <= 64) {
511 switch (CIBitWidth) {
512 case 8: form = dwarf::DW_FORM_data1; break;
513 case 16: form = dwarf::DW_FORM_data2; break;
514 case 32: form = dwarf::DW_FORM_data4; break;
515 case 64: form = dwarf::DW_FORM_data8; break;
517 form = Unsigned ? dwarf::DW_FORM_udata : dwarf::DW_FORM_sdata;
520 addUInt(Die, dwarf::DW_AT_const_value, form, CI->getZExtValue());
522 addSInt(Die, dwarf::DW_AT_const_value, form, CI->getSExtValue());
526 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
528 // Get the raw data form of the large APInt.
529 const APInt Val = CI->getValue();
530 const uint64_t *Ptr64 = Val.getRawData();
532 int NumBytes = Val.getBitWidth() / 8; // 8 bits per byte.
533 bool LittleEndian = Asm->getTargetData().isLittleEndian();
535 // Output the constant to DWARF one byte at a time.
536 for (int i = 0; i < NumBytes; i++) {
539 c = Ptr64[i / 8] >> (8 * (i & 7));
541 c = Ptr64[(NumBytes - 1 - i) / 8] >> (8 * ((NumBytes - 1 - i) & 7));
542 addUInt(Block, 0, dwarf::DW_FORM_data1, c);
545 addBlock(Die, dwarf::DW_AT_const_value, 0, Block);
549 /// addTemplateParams - Add template parameters in buffer.
550 void CompileUnit::addTemplateParams(DIE &Buffer, DIArray TParams) {
551 // Add template parameters.
552 for (unsigned i = 0, e = TParams.getNumElements(); i != e; ++i) {
553 DIDescriptor Element = TParams.getElement(i);
554 if (Element.isTemplateTypeParameter())
555 Buffer.addChild(getOrCreateTemplateTypeParameterDIE(
556 DITemplateTypeParameter(Element)));
557 else if (Element.isTemplateValueParameter())
558 Buffer.addChild(getOrCreateTemplateValueParameterDIE(
559 DITemplateValueParameter(Element)));
563 /// addToContextOwner - Add Die into the list of its context owner's children.
564 void CompileUnit::addToContextOwner(DIE *Die, DIDescriptor Context) {
565 if (Context.isType()) {
566 DIE *ContextDIE = getOrCreateTypeDIE(DIType(Context));
567 ContextDIE->addChild(Die);
568 } else if (Context.isNameSpace()) {
569 DIE *ContextDIE = getOrCreateNameSpace(DINameSpace(Context));
570 ContextDIE->addChild(Die);
571 } else if (Context.isSubprogram()) {
572 DIE *ContextDIE = getOrCreateSubprogramDIE(DISubprogram(Context));
573 ContextDIE->addChild(Die);
574 } else if (DIE *ContextDIE = getDIE(Context))
575 ContextDIE->addChild(Die);
580 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
582 DIE *CompileUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
586 DIE *TyDIE = getDIE(Ty);
591 TyDIE = new DIE(dwarf::DW_TAG_base_type);
592 insertDIE(Ty, TyDIE);
593 if (Ty.isBasicType())
594 constructTypeDIE(*TyDIE, DIBasicType(Ty));
595 else if (Ty.isCompositeType())
596 constructTypeDIE(*TyDIE, DICompositeType(Ty));
598 assert(Ty.isDerivedType() && "Unknown kind of DIType");
599 constructTypeDIE(*TyDIE, DIDerivedType(Ty));
602 addToContextOwner(TyDIE, Ty.getContext());
606 /// addType - Add a new type attribute to the specified entity.
607 void CompileUnit::addType(DIE *Entity, DIType Ty) {
611 // Check for pre-existence.
612 DIEEntry *Entry = getDIEEntry(Ty);
613 // If it exists then use the existing value.
615 Entity->addValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, Entry);
620 DIE *Buffer = getOrCreateTypeDIE(Ty);
623 Entry = createDIEEntry(Buffer);
624 insertDIEEntry(Ty, Entry);
625 Entity->addValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, Entry);
627 // If this is a complete composite type then include it in the
628 // list of global types.
632 /// addGlobalType - Add a new global type to the compile unit.
634 void CompileUnit::addGlobalType(DIType Ty) {
635 DIDescriptor Context = Ty.getContext();
636 if (Ty.isCompositeType() && !Ty.getName().empty() && !Ty.isForwardDecl()
637 && (!Context || Context.isCompileUnit() || Context.isFile()
638 || Context.isNameSpace()))
639 if (DIEEntry *Entry = getDIEEntry(Ty))
640 GlobalTypes[Ty.getName()] = Entry->getEntry();
643 /// addPubTypes - Add type for pubtypes section.
644 void CompileUnit::addPubTypes(DISubprogram SP) {
645 DICompositeType SPTy = SP.getType();
646 unsigned SPTag = SPTy.getTag();
647 if (SPTag != dwarf::DW_TAG_subroutine_type)
650 DIArray Args = SPTy.getTypeArray();
651 for (unsigned i = 0, e = Args.getNumElements(); i != e; ++i) {
652 DIType ATy(Args.getElement(i));
659 /// constructTypeDIE - Construct basic type die from DIBasicType.
660 void CompileUnit::constructTypeDIE(DIE &Buffer, DIBasicType BTy) {
661 // Get core information.
662 StringRef Name = BTy.getName();
663 // Add name if not anonymous or intermediate type.
665 addString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
667 if (BTy.getTag() == dwarf::DW_TAG_unspecified_type) {
668 Buffer.setTag(dwarf::DW_TAG_unspecified_type);
669 // Unspecified types has only name, nothing else.
673 Buffer.setTag(dwarf::DW_TAG_base_type);
674 addUInt(&Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
677 uint64_t Size = BTy.getSizeInBits() >> 3;
678 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
681 /// constructTypeDIE - Construct derived type die from DIDerivedType.
682 void CompileUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
683 // Get core information.
684 StringRef Name = DTy.getName();
685 uint64_t Size = DTy.getSizeInBits() >> 3;
686 unsigned Tag = DTy.getTag();
688 // FIXME - Workaround for templates.
689 if (Tag == dwarf::DW_TAG_inheritance) Tag = dwarf::DW_TAG_reference_type;
693 // Map to main type, void will not have a type.
694 DIType FromTy = DTy.getTypeDerivedFrom();
695 addType(&Buffer, FromTy);
697 // Add name if not anonymous or intermediate type.
699 addString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
701 // Add size if non-zero (derived types might be zero-sized.)
703 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
705 // Add source line info if available and TyDesc is not a forward declaration.
706 if (!DTy.isForwardDecl())
707 addSourceLine(&Buffer, DTy);
710 /// constructTypeDIE - Construct type DIE from DICompositeType.
711 void CompileUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
712 // Get core information.
713 StringRef Name = CTy.getName();
715 uint64_t Size = CTy.getSizeInBits() >> 3;
716 unsigned Tag = CTy.getTag();
720 case dwarf::DW_TAG_vector_type:
721 case dwarf::DW_TAG_array_type:
722 constructArrayTypeDIE(Buffer, &CTy);
724 case dwarf::DW_TAG_enumeration_type: {
725 DIArray Elements = CTy.getTypeArray();
727 // Add enumerators to enumeration type.
728 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
730 DIDescriptor Enum(Elements.getElement(i));
731 if (Enum.isEnumerator()) {
732 ElemDie = constructEnumTypeDIE(DIEnumerator(Enum));
733 Buffer.addChild(ElemDie);
738 case dwarf::DW_TAG_subroutine_type: {
740 DIArray Elements = CTy.getTypeArray();
741 DIDescriptor RTy = Elements.getElement(0);
742 addType(&Buffer, DIType(RTy));
744 bool isPrototyped = true;
746 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
747 DIDescriptor Ty = Elements.getElement(i);
748 if (Ty.isUnspecifiedParameter()) {
749 DIE *Arg = new DIE(dwarf::DW_TAG_unspecified_parameters);
750 Buffer.addChild(Arg);
751 isPrototyped = false;
753 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
754 addType(Arg, DIType(Ty));
755 Buffer.addChild(Arg);
758 // Add prototype flag.
760 addUInt(&Buffer, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
763 case dwarf::DW_TAG_structure_type:
764 case dwarf::DW_TAG_union_type:
765 case dwarf::DW_TAG_class_type: {
766 // Add elements to structure type.
767 DIArray Elements = CTy.getTypeArray();
769 // A forward struct declared type may not have elements available.
770 unsigned N = Elements.getNumElements();
774 // Add elements to structure type.
775 for (unsigned i = 0; i < N; ++i) {
776 DIDescriptor Element = Elements.getElement(i);
778 if (Element.isSubprogram()) {
779 DISubprogram SP(Element);
780 ElemDie = getOrCreateSubprogramDIE(DISubprogram(Element));
781 if (SP.isProtected())
782 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag,
783 dwarf::DW_ACCESS_protected);
784 else if (SP.isPrivate())
785 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag,
786 dwarf::DW_ACCESS_private);
788 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag,
789 dwarf::DW_ACCESS_public);
791 addUInt(ElemDie, dwarf::DW_AT_explicit, dwarf::DW_FORM_flag, 1);
793 else if (Element.isVariable()) {
794 DIVariable DV(Element);
795 ElemDie = new DIE(dwarf::DW_TAG_variable);
796 addString(ElemDie, dwarf::DW_AT_name, dwarf::DW_FORM_string,
798 addType(ElemDie, DV.getType());
799 addUInt(ElemDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
800 addUInt(ElemDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
801 addSourceLine(ElemDie, DV);
802 } else if (Element.isDerivedType())
803 ElemDie = createMemberDIE(DIDerivedType(Element));
806 Buffer.addChild(ElemDie);
809 if (CTy.isAppleBlockExtension())
810 addUInt(&Buffer, dwarf::DW_AT_APPLE_block, dwarf::DW_FORM_flag, 1);
812 unsigned RLang = CTy.getRunTimeLang();
814 addUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class,
815 dwarf::DW_FORM_data1, RLang);
817 DICompositeType ContainingType = CTy.getContainingType();
818 if (DIDescriptor(ContainingType).isCompositeType())
819 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4,
820 getOrCreateTypeDIE(DIType(ContainingType)));
822 DIDescriptor Context = CTy.getContext();
823 addToContextOwner(&Buffer, Context);
826 if (CTy.isObjcClassComplete())
827 addUInt(&Buffer, dwarf::DW_AT_APPLE_objc_complete_type,
828 dwarf::DW_FORM_flag, 1);
830 if (Tag == dwarf::DW_TAG_class_type)
831 addTemplateParams(Buffer, CTy.getTemplateParams());
839 // Add name if not anonymous or intermediate type.
841 addString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
843 if (Tag == dwarf::DW_TAG_enumeration_type || Tag == dwarf::DW_TAG_class_type
844 || Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type)
846 // Add size if non-zero (derived types might be zero-sized.)
848 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
850 // Add zero size if it is not a forward declaration.
851 if (CTy.isForwardDecl())
852 addUInt(&Buffer, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
854 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, 0);
857 // Add source line info if available.
858 if (!CTy.isForwardDecl())
859 addSourceLine(&Buffer, CTy);
863 /// getOrCreateTemplateTypeParameterDIE - Find existing DIE or create new DIE
864 /// for the given DITemplateTypeParameter.
866 CompileUnit::getOrCreateTemplateTypeParameterDIE(DITemplateTypeParameter TP) {
867 DIE *ParamDIE = getDIE(TP);
871 ParamDIE = new DIE(dwarf::DW_TAG_template_type_parameter);
872 addType(ParamDIE, TP.getType());
873 addString(ParamDIE, dwarf::DW_AT_name, dwarf::DW_FORM_string, TP.getName());
877 /// getOrCreateTemplateValueParameterDIE - Find existing DIE or create new DIE
878 /// for the given DITemplateValueParameter.
880 CompileUnit::getOrCreateTemplateValueParameterDIE(DITemplateValueParameter TPV) {
881 DIE *ParamDIE = getDIE(TPV);
885 ParamDIE = new DIE(dwarf::DW_TAG_template_value_parameter);
886 addType(ParamDIE, TPV.getType());
887 if (!TPV.getName().empty())
888 addString(ParamDIE, dwarf::DW_AT_name, dwarf::DW_FORM_string, TPV.getName());
889 addUInt(ParamDIE, dwarf::DW_AT_const_value, dwarf::DW_FORM_udata,
894 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
895 DIE *CompileUnit::getOrCreateNameSpace(DINameSpace NS) {
896 DIE *NDie = getDIE(NS);
899 NDie = new DIE(dwarf::DW_TAG_namespace);
901 if (!NS.getName().empty())
902 addString(NDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, NS.getName());
903 addSourceLine(NDie, NS);
904 addToContextOwner(NDie, NS.getContext());
908 /// getRealLinkageName - If special LLVM prefix that is used to inform the asm
909 /// printer to not emit usual symbol prefix before the symbol name is used then
910 /// return linkage name after skipping this special LLVM prefix.
911 static StringRef getRealLinkageName(StringRef LinkageName) {
913 if (LinkageName.startswith(StringRef(&One, 1)))
914 return LinkageName.substr(1);
918 /// getOrCreateSubprogramDIE - Create new DIE using SP.
919 DIE *CompileUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
920 DIE *SPDie = getDIE(SP);
924 SPDie = new DIE(dwarf::DW_TAG_subprogram);
926 // DW_TAG_inlined_subroutine may refer to this DIE.
927 insertDIE(SP, SPDie);
929 // Add to context owner.
930 addToContextOwner(SPDie, SP.getContext());
932 // Add function template parameters.
933 addTemplateParams(*SPDie, SP.getTemplateParams());
935 StringRef LinkageName = SP.getLinkageName();
936 if (!LinkageName.empty())
937 addString(SPDie, dwarf::DW_AT_MIPS_linkage_name,
938 dwarf::DW_FORM_string,
939 getRealLinkageName(LinkageName));
941 // If this DIE is going to refer declaration info using AT_specification
942 // then there is no need to add other attributes.
943 if (SP.getFunctionDeclaration().isSubprogram())
946 // Constructors and operators for anonymous aggregates do not have names.
947 if (!SP.getName().empty())
948 addString(SPDie, dwarf::DW_AT_name, dwarf::DW_FORM_string,
951 addSourceLine(SPDie, SP);
953 if (SP.isPrototyped())
954 addUInt(SPDie, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
957 DICompositeType SPTy = SP.getType();
958 DIArray Args = SPTy.getTypeArray();
959 unsigned SPTag = SPTy.getTag();
961 if (Args.getNumElements() == 0 || SPTag != dwarf::DW_TAG_subroutine_type)
962 addType(SPDie, SPTy);
964 addType(SPDie, DIType(Args.getElement(0)));
966 unsigned VK = SP.getVirtuality();
968 addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_flag, VK);
969 DIEBlock *Block = getDIEBlock();
970 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
971 addUInt(Block, 0, dwarf::DW_FORM_udata, SP.getVirtualIndex());
972 addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, 0, Block);
973 ContainingTypeMap.insert(std::make_pair(SPDie,
974 SP.getContainingType()));
977 if (!SP.isDefinition()) {
978 addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
980 // Add arguments. Do not add arguments for subprogram definition. They will
981 // be handled while processing variables.
982 DICompositeType SPTy = SP.getType();
983 DIArray Args = SPTy.getTypeArray();
984 unsigned SPTag = SPTy.getTag();
986 if (SPTag == dwarf::DW_TAG_subroutine_type)
987 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
988 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
989 DIType ATy = DIType(DIType(Args.getElement(i)));
991 if (ATy.isArtificial())
992 addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
993 SPDie->addChild(Arg);
997 if (SP.isArtificial())
998 addUInt(SPDie, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
1000 if (!SP.isLocalToUnit())
1001 addUInt(SPDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
1003 if (SP.isOptimized())
1004 addUInt(SPDie, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1);
1006 if (unsigned isa = Asm->getISAEncoding()) {
1007 addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
1013 // Return const expression if value is a GEP to access merged global
1015 // i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
1016 static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
1017 const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
1018 if (!CE || CE->getNumOperands() != 3 ||
1019 CE->getOpcode() != Instruction::GetElementPtr)
1022 // First operand points to a global struct.
1023 Value *Ptr = CE->getOperand(0);
1024 if (!isa<GlobalValue>(Ptr) ||
1025 !isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
1028 // Second operand is zero.
1029 const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
1030 if (!CI || !CI->isZero())
1033 // Third operand is offset.
1034 if (!isa<ConstantInt>(CE->getOperand(2)))
1040 /// createGlobalVariableDIE - create global variable DIE.
1041 void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
1042 // Check for pre-existence.
1046 DIGlobalVariable GV(N);
1050 DIE *VariableDIE = new DIE(GV.getTag());
1052 insertDIE(N, VariableDIE);
1055 addString(VariableDIE, dwarf::DW_AT_name, dwarf::DW_FORM_string,
1056 GV.getDisplayName());
1057 StringRef LinkageName = GV.getLinkageName();
1058 bool isGlobalVariable = GV.getGlobal() != NULL;
1059 if (!LinkageName.empty() && isGlobalVariable)
1060 addString(VariableDIE, dwarf::DW_AT_MIPS_linkage_name,
1061 dwarf::DW_FORM_string,
1062 getRealLinkageName(LinkageName));
1064 DIType GTy = GV.getType();
1065 addType(VariableDIE, GTy);
1067 // Add scoping info.
1068 if (!GV.isLocalToUnit()) {
1069 addUInt(VariableDIE, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
1070 // Expose as global.
1071 addGlobal(GV.getName(), VariableDIE);
1073 // Add line number info.
1074 addSourceLine(VariableDIE, GV);
1075 // Add to context owner.
1076 DIDescriptor GVContext = GV.getContext();
1077 addToContextOwner(VariableDIE, GVContext);
1079 if (isGlobalVariable) {
1080 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1081 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
1082 addLabel(Block, 0, dwarf::DW_FORM_udata,
1083 Asm->Mang->getSymbol(GV.getGlobal()));
1084 // Do not create specification DIE if context is either compile unit
1086 if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
1087 !GVContext.isFile() && !isSubprogramContext(GVContext)) {
1088 // Create specification DIE.
1089 DIE *VariableSpecDIE = new DIE(dwarf::DW_TAG_variable);
1090 addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification,
1091 dwarf::DW_FORM_ref4, VariableDIE);
1092 addBlock(VariableSpecDIE, dwarf::DW_AT_location, 0, Block);
1093 addUInt(VariableDIE, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag,
1095 addDie(VariableSpecDIE);
1097 addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
1099 } else if (const ConstantInt *CI =
1100 dyn_cast_or_null<ConstantInt>(GV.getConstant()))
1101 addConstantValue(VariableDIE, CI, GTy.isUnsignedDIType());
1102 else if (const ConstantExpr *CE = getMergedGlobalExpr(N->getOperand(11))) {
1103 // GV is a merged global.
1104 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1105 Value *Ptr = CE->getOperand(0);
1106 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
1107 addLabel(Block, 0, dwarf::DW_FORM_udata,
1108 Asm->Mang->getSymbol(cast<GlobalValue>(Ptr)));
1109 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1110 SmallVector<Value*, 3> Idx(CE->op_begin()+1, CE->op_end());
1111 addUInt(Block, 0, dwarf::DW_FORM_udata,
1112 Asm->getTargetData().getIndexedOffset(Ptr->getType(), Idx));
1113 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1114 addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
1120 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
1121 void CompileUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy){
1122 DIE *DW_Subrange = new DIE(dwarf::DW_TAG_subrange_type);
1123 addDIEEntry(DW_Subrange, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, IndexTy);
1124 int64_t L = SR.getLo();
1125 int64_t H = SR.getHi();
1127 // The L value defines the lower bounds which is typically zero for C/C++. The
1128 // H value is the upper bounds. Values are 64 bit. H - L + 1 is the size
1129 // of the array. If L > H then do not emit DW_AT_lower_bound and
1130 // DW_AT_upper_bound attributes. If L is zero and H is also zero then the
1131 // array has one element and in such case do not emit lower bound.
1134 Buffer.addChild(DW_Subrange);
1138 addSInt(DW_Subrange, dwarf::DW_AT_lower_bound, 0, L);
1139 addSInt(DW_Subrange, dwarf::DW_AT_upper_bound, 0, H);
1140 Buffer.addChild(DW_Subrange);
1143 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
1144 void CompileUnit::constructArrayTypeDIE(DIE &Buffer,
1145 DICompositeType *CTy) {
1146 Buffer.setTag(dwarf::DW_TAG_array_type);
1147 if (CTy->getTag() == dwarf::DW_TAG_vector_type)
1148 addUInt(&Buffer, dwarf::DW_AT_GNU_vector, dwarf::DW_FORM_flag, 1);
1150 // Emit derived type.
1151 addType(&Buffer, CTy->getTypeDerivedFrom());
1152 DIArray Elements = CTy->getTypeArray();
1154 // Get an anonymous type for index type.
1155 DIE *IdxTy = getIndexTyDie();
1157 // Construct an anonymous type for index type.
1158 IdxTy = new DIE(dwarf::DW_TAG_base_type);
1159 addUInt(IdxTy, dwarf::DW_AT_byte_size, 0, sizeof(int32_t));
1160 addUInt(IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1161 dwarf::DW_ATE_signed);
1163 setIndexTyDie(IdxTy);
1166 // Add subranges to array type.
1167 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1168 DIDescriptor Element = Elements.getElement(i);
1169 if (Element.getTag() == dwarf::DW_TAG_subrange_type)
1170 constructSubrangeDIE(Buffer, DISubrange(Element), IdxTy);
1174 /// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
1175 DIE *CompileUnit::constructEnumTypeDIE(DIEnumerator ETy) {
1176 DIE *Enumerator = new DIE(dwarf::DW_TAG_enumerator);
1177 StringRef Name = ETy.getName();
1178 addString(Enumerator, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
1179 int64_t Value = ETy.getEnumValue();
1180 addSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, Value);
1184 /// constructContainingTypeDIEs - Construct DIEs for types that contain
1186 void CompileUnit::constructContainingTypeDIEs() {
1187 for (DenseMap<DIE *, const MDNode *>::iterator CI = ContainingTypeMap.begin(),
1188 CE = ContainingTypeMap.end(); CI != CE; ++CI) {
1189 DIE *SPDie = CI->first;
1190 const MDNode *N = CI->second;
1192 DIE *NDie = getDIE(N);
1193 if (!NDie) continue;
1194 addDIEEntry(SPDie, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4, NDie);
1198 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
1199 DIE *CompileUnit::constructVariableDIE(DbgVariable *DV, bool isScopeAbstract) {
1200 StringRef Name = DV->getName();
1204 // Translate tag to proper Dwarf tag.
1205 unsigned Tag = DV->getTag();
1207 // Define variable debug information entry.
1208 DIE *VariableDie = new DIE(Tag);
1209 DbgVariable *AbsVar = DV->getAbstractVariable();
1210 DIE *AbsDIE = AbsVar ? AbsVar->getDIE() : NULL;
1212 addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin,
1213 dwarf::DW_FORM_ref4, AbsDIE);
1215 addString(VariableDie, dwarf::DW_AT_name,
1216 dwarf::DW_FORM_string, Name);
1217 addSourceLine(VariableDie, DV->getVariable());
1218 addType(VariableDie, DV->getType());
1221 if (DV->isArtificial())
1222 addUInt(VariableDie, dwarf::DW_AT_artificial,
1223 dwarf::DW_FORM_flag, 1);
1225 if (isScopeAbstract) {
1226 DV->setDIE(VariableDie);
1230 // Add variable address.
1232 unsigned Offset = DV->getDotDebugLocOffset();
1233 if (Offset != ~0U) {
1234 addLabel(VariableDie, dwarf::DW_AT_location,
1235 dwarf::DW_FORM_data4,
1236 Asm->GetTempSymbol("debug_loc", Offset));
1237 DV->setDIE(VariableDie);
1241 // Check if variable is described by a DBG_VALUE instruction.
1242 if (const MachineInstr *DVInsn = DV->getMInsn()) {
1243 bool updated = false;
1244 if (DVInsn->getNumOperands() == 3) {
1245 if (DVInsn->getOperand(0).isReg()) {
1246 const MachineOperand RegOp = DVInsn->getOperand(0);
1247 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1248 if (DVInsn->getOperand(1).isImm() &&
1249 TRI->getFrameRegister(*Asm->MF) == RegOp.getReg()) {
1250 unsigned FrameReg = 0;
1251 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
1253 TFI->getFrameIndexReference(*Asm->MF,
1254 DVInsn->getOperand(1).getImm(),
1256 MachineLocation Location(FrameReg, Offset);
1257 addVariableAddress(DV, VariableDie, Location);
1259 } else if (RegOp.getReg())
1260 addVariableAddress(DV, VariableDie,
1261 MachineLocation(RegOp.getReg()));
1264 else if (DVInsn->getOperand(0).isImm())
1266 addConstantValue(VariableDie, DVInsn->getOperand(0),
1268 else if (DVInsn->getOperand(0).isFPImm())
1270 addConstantFPValue(VariableDie, DVInsn->getOperand(0));
1271 else if (DVInsn->getOperand(0).isCImm())
1273 addConstantValue(VariableDie,
1274 DVInsn->getOperand(0).getCImm(),
1275 DV->getType().isUnsignedDIType());
1277 addVariableAddress(DV, VariableDie,
1278 Asm->getDebugValueLocation(DVInsn));
1282 // If variableDie is not updated then DBG_VALUE instruction does not
1283 // have valid variable info.
1287 DV->setDIE(VariableDie);
1290 // .. else use frame index.
1291 int FI = DV->getFrameIndex();
1293 unsigned FrameReg = 0;
1294 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
1296 TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
1297 MachineLocation Location(FrameReg, Offset);
1298 addVariableAddress(DV, VariableDie, Location);
1302 DV->setDIE(VariableDie);
1306 /// createMemberDIE - Create new member DIE.
1307 DIE *CompileUnit::createMemberDIE(DIDerivedType DT) {
1308 DIE *MemberDie = new DIE(DT.getTag());
1309 StringRef Name = DT.getName();
1311 addString(MemberDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
1313 addType(MemberDie, DT.getTypeDerivedFrom());
1315 addSourceLine(MemberDie, DT);
1317 DIEBlock *MemLocationDie = new (DIEValueAllocator) DIEBlock();
1318 addUInt(MemLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
1320 uint64_t Size = DT.getSizeInBits();
1321 uint64_t FieldSize = DT.getOriginalTypeSize();
1323 if (Size != FieldSize) {
1325 addUInt(MemberDie, dwarf::DW_AT_byte_size, 0, DT.getOriginalTypeSize()>>3);
1326 addUInt(MemberDie, dwarf::DW_AT_bit_size, 0, DT.getSizeInBits());
1328 uint64_t Offset = DT.getOffsetInBits();
1329 uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
1330 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1331 uint64_t FieldOffset = (HiMark - FieldSize);
1332 Offset -= FieldOffset;
1334 // Maybe we need to work from the other end.
1335 if (Asm->getTargetData().isLittleEndian())
1336 Offset = FieldSize - (Offset + Size);
1337 addUInt(MemberDie, dwarf::DW_AT_bit_offset, 0, Offset);
1339 // Here WD_AT_data_member_location points to the anonymous
1340 // field that includes this bit field.
1341 addUInt(MemLocationDie, 0, dwarf::DW_FORM_udata, FieldOffset >> 3);
1344 // This is not a bitfield.
1345 addUInt(MemLocationDie, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits() >> 3);
1347 if (DT.getTag() == dwarf::DW_TAG_inheritance
1348 && DT.isVirtual()) {
1350 // For C++, virtual base classes are not at fixed offset. Use following
1351 // expression to extract appropriate offset from vtable.
1352 // BaseAddr = ObAddr + *((*ObAddr) - Offset)
1354 DIEBlock *VBaseLocationDie = new (DIEValueAllocator) DIEBlock();
1355 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
1356 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1357 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1358 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits());
1359 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
1360 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1361 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1363 addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0,
1366 addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0, MemLocationDie);
1368 if (DT.isProtected())
1369 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag,
1370 dwarf::DW_ACCESS_protected);
1371 else if (DT.isPrivate())
1372 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag,
1373 dwarf::DW_ACCESS_private);
1374 // Otherwise C++ member and base classes are considered public.
1376 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag,
1377 dwarf::DW_ACCESS_public);
1379 addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_flag,
1380 dwarf::DW_VIRTUALITY_virtual);
1382 // Objective-C properties.
1383 StringRef PropertyName = DT.getObjCPropertyName();
1384 if (!PropertyName.empty()) {
1385 addString(MemberDie, dwarf::DW_AT_APPLE_property_name, dwarf::DW_FORM_string,
1387 StringRef GetterName = DT.getObjCPropertyGetterName();
1388 if (!GetterName.empty())
1389 addString(MemberDie, dwarf::DW_AT_APPLE_property_getter,
1390 dwarf::DW_FORM_string, GetterName);
1391 StringRef SetterName = DT.getObjCPropertySetterName();
1392 if (!SetterName.empty())
1393 addString(MemberDie, dwarf::DW_AT_APPLE_property_setter,
1394 dwarf::DW_FORM_string, SetterName);
1395 unsigned PropertyAttributes = 0;
1396 if (DT.isReadOnlyObjCProperty())
1397 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readonly;
1398 if (DT.isReadWriteObjCProperty())
1399 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readwrite;
1400 if (DT.isAssignObjCProperty())
1401 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_assign;
1402 if (DT.isRetainObjCProperty())
1403 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_retain;
1404 if (DT.isCopyObjCProperty())
1405 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_copy;
1406 if (DT.isNonAtomicObjCProperty())
1407 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_nonatomic;
1408 if (PropertyAttributes)
1409 addUInt(MemberDie, dwarf::DW_AT_APPLE_property_attribute, 0,
1410 PropertyAttributes);