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 "DwarfAccelTable.h"
17 #include "DwarfCompileUnit.h"
18 #include "DwarfDebug.h"
19 #include "llvm/Constants.h"
20 #include "llvm/GlobalVariable.h"
21 #include "llvm/Instructions.h"
22 #include "llvm/Analysis/DIBuilder.h"
23 #include "llvm/Support/Debug.h"
24 #include "llvm/Target/Mangler.h"
25 #include "llvm/Target/TargetData.h"
26 #include "llvm/Target/TargetFrameLowering.h"
27 #include "llvm/Target/TargetMachine.h"
28 #include "llvm/Target/TargetRegisterInfo.h"
29 #include "llvm/ADT/APFloat.h"
30 #include "llvm/Support/ErrorHandling.h"
34 /// CompileUnit - Compile unit constructor.
35 CompileUnit::CompileUnit(unsigned I, unsigned L, DIE *D, AsmPrinter *A,
37 : ID(I), Language(L), CUDie(D), Asm(A), DD(DW), IndexTyDie(0) {
38 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 /// addUInt - Add an unsigned integer attribute data and value.
56 void CompileUnit::addUInt(DIE *Die, unsigned Attribute,
57 unsigned Form, uint64_t Integer) {
58 if (!Form) Form = DIEInteger::BestForm(false, Integer);
59 DIEValue *Value = Integer == 1 ?
60 DIEIntegerOne : new (DIEValueAllocator) DIEInteger(Integer);
61 Die->addValue(Attribute, Form, Value);
64 /// addSInt - Add an signed integer attribute data and value.
66 void CompileUnit::addSInt(DIE *Die, unsigned Attribute,
67 unsigned Form, int64_t Integer) {
68 if (!Form) Form = DIEInteger::BestForm(true, Integer);
69 DIEValue *Value = new (DIEValueAllocator) DIEInteger(Integer);
70 Die->addValue(Attribute, Form, Value);
73 /// addString - Add a string attribute data and value. We always emit a
74 /// reference to the string pool instead of immediate strings so that DIEs have
75 /// more predictable sizes.
76 void CompileUnit::addString(DIE *Die, unsigned Attribute, StringRef String) {
77 MCSymbol *Symb = DD->getStringPoolEntry(String);
79 if (Asm->needsRelocationsForDwarfStringPool())
80 Value = new (DIEValueAllocator) DIELabel(Symb);
82 MCSymbol *StringPool = DD->getStringPool();
83 Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool);
85 Die->addValue(Attribute, dwarf::DW_FORM_strp, Value);
88 /// addLabel - Add a Dwarf label attribute data and value.
90 void CompileUnit::addLabel(DIE *Die, unsigned Attribute, unsigned Form,
91 const MCSymbol *Label) {
92 DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
93 Die->addValue(Attribute, Form, Value);
96 /// addDelta - Add a label delta attribute data and value.
98 void CompileUnit::addDelta(DIE *Die, unsigned Attribute, unsigned Form,
99 const MCSymbol *Hi, const MCSymbol *Lo) {
100 DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo);
101 Die->addValue(Attribute, Form, Value);
104 /// addDIEEntry - Add a DIE attribute data and value.
106 void CompileUnit::addDIEEntry(DIE *Die, unsigned Attribute, unsigned Form,
108 Die->addValue(Attribute, Form, createDIEEntry(Entry));
111 /// addBlock - Add block data.
113 void CompileUnit::addBlock(DIE *Die, unsigned Attribute, unsigned Form,
115 Block->ComputeSize(Asm);
116 DIEBlocks.push_back(Block); // Memoize so we can call the destructor later on.
117 Die->addValue(Attribute, Block->BestForm(), Block);
120 /// addSourceLine - Add location information to specified debug information
122 void CompileUnit::addSourceLine(DIE *Die, DIVariable V) {
127 unsigned Line = V.getLineNumber();
130 unsigned FileID = DD->GetOrCreateSourceID(V.getContext().getFilename(),
131 V.getContext().getDirectory());
132 assert(FileID && "Invalid file id");
133 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
134 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
137 /// addSourceLine - Add location information to specified debug information
139 void CompileUnit::addSourceLine(DIE *Die, DIGlobalVariable G) {
140 // Verify global variable.
144 unsigned Line = G.getLineNumber();
147 unsigned FileID = DD->GetOrCreateSourceID(G.getFilename(), G.getDirectory());
148 assert(FileID && "Invalid file id");
149 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
150 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
153 /// addSourceLine - Add location information to specified debug information
155 void CompileUnit::addSourceLine(DIE *Die, DISubprogram SP) {
156 // Verify subprogram.
160 // If the line number is 0, don't add it.
161 unsigned Line = SP.getLineNumber();
165 unsigned FileID = DD->GetOrCreateSourceID(SP.getFilename(),
167 assert(FileID && "Invalid file id");
168 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
169 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
172 /// addSourceLine - Add location information to specified debug information
174 void CompileUnit::addSourceLine(DIE *Die, DIType Ty) {
179 unsigned Line = Ty.getLineNumber();
182 unsigned FileID = DD->GetOrCreateSourceID(Ty.getFilename(),
184 assert(FileID && "Invalid file id");
185 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
186 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
189 /// addSourceLine - Add location information to specified debug information
191 void CompileUnit::addSourceLine(DIE *Die, DIObjCProperty Ty) {
196 unsigned Line = Ty.getLineNumber();
199 DIFile File = Ty.getFile();
200 unsigned FileID = DD->GetOrCreateSourceID(File.getFilename(),
201 File.getDirectory());
202 assert(FileID && "Invalid file id");
203 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
204 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
207 /// addSourceLine - Add location information to specified debug information
209 void CompileUnit::addSourceLine(DIE *Die, DINameSpace NS) {
214 unsigned Line = NS.getLineNumber();
217 StringRef FN = NS.getFilename();
219 unsigned FileID = DD->GetOrCreateSourceID(FN, NS.getDirectory());
220 assert(FileID && "Invalid file id");
221 addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
222 addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
225 /// addVariableAddress - Add DW_AT_location attribute for a
226 /// DbgVariable based on provided MachineLocation.
227 void CompileUnit::addVariableAddress(DbgVariable *&DV, DIE *Die,
228 MachineLocation Location) {
229 if (DV->variableHasComplexAddress())
230 addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
231 else if (DV->isBlockByrefVariable())
232 addBlockByrefAddress(DV, Die, dwarf::DW_AT_location, Location);
234 addAddress(Die, dwarf::DW_AT_location, Location);
237 /// addRegisterOp - Add register operand.
238 void CompileUnit::addRegisterOp(DIE *TheDie, unsigned Reg) {
239 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
240 unsigned DWReg = RI->getDwarfRegNum(Reg, false);
242 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + DWReg);
244 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_regx);
245 addUInt(TheDie, 0, dwarf::DW_FORM_udata, DWReg);
249 /// addRegisterOffset - Add register offset.
250 void CompileUnit::addRegisterOffset(DIE *TheDie, unsigned Reg,
252 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
253 unsigned DWReg = RI->getDwarfRegNum(Reg, false);
254 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
255 if (Reg == TRI->getFrameRegister(*Asm->MF))
256 // If variable offset is based in frame register then use fbreg.
257 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_fbreg);
259 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + DWReg);
261 addUInt(TheDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
262 addUInt(TheDie, 0, dwarf::DW_FORM_udata, DWReg);
264 addSInt(TheDie, 0, dwarf::DW_FORM_sdata, Offset);
267 /// addAddress - Add an address attribute to a die based on the location
269 void CompileUnit::addAddress(DIE *Die, unsigned Attribute,
270 const MachineLocation &Location) {
271 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
273 if (Location.isReg())
274 addRegisterOp(Block, Location.getReg());
276 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
278 // Now attach the location information to the DIE.
279 addBlock(Die, Attribute, 0, Block);
282 /// addComplexAddress - Start with the address based on the location provided,
283 /// and generate the DWARF information necessary to find the actual variable
284 /// given the extra address information encoded in the DIVariable, starting from
285 /// the starting location. Add the DWARF information to the die.
287 void CompileUnit::addComplexAddress(DbgVariable *&DV, DIE *Die,
289 const MachineLocation &Location) {
290 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
291 unsigned N = DV->getNumAddrElements();
293 if (Location.isReg()) {
294 if (N >= 2 && DV->getAddrElement(0) == DIBuilder::OpPlus) {
295 // If first address element is OpPlus then emit
296 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
297 addRegisterOffset(Block, Location.getReg(), DV->getAddrElement(1));
300 addRegisterOp(Block, Location.getReg());
303 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
306 uint64_t Element = DV->getAddrElement(i);
307 if (Element == DIBuilder::OpPlus) {
308 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
309 addUInt(Block, 0, dwarf::DW_FORM_udata, DV->getAddrElement(++i));
310 } else if (Element == DIBuilder::OpDeref) {
311 if (!Location.isReg())
312 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
313 } else llvm_unreachable("unknown DIBuilder Opcode");
316 // Now attach the location information to the DIE.
317 addBlock(Die, Attribute, 0, Block);
320 /* Byref variables, in Blocks, are declared by the programmer as "SomeType
321 VarName;", but the compiler creates a __Block_byref_x_VarName struct, and
322 gives the variable VarName either the struct, or a pointer to the struct, as
323 its type. This is necessary for various behind-the-scenes things the
324 compiler needs to do with by-reference variables in Blocks.
326 However, as far as the original *programmer* is concerned, the variable
327 should still have type 'SomeType', as originally declared.
329 The function getBlockByrefType dives into the __Block_byref_x_VarName
330 struct to find the original type of the variable, which is then assigned to
331 the variable's Debug Information Entry as its real type. So far, so good.
332 However now the debugger will expect the variable VarName to have the type
333 SomeType. So we need the location attribute for the variable to be an
334 expression that explains to the debugger how to navigate through the
335 pointers and struct to find the actual variable of type SomeType.
337 The following function does just that. We start by getting
338 the "normal" location for the variable. This will be the location
339 of either the struct __Block_byref_x_VarName or the pointer to the
340 struct __Block_byref_x_VarName.
342 The struct will look something like:
344 struct __Block_byref_x_VarName {
346 struct __Block_byref_x_VarName *forwarding;
347 ... <various other fields>
349 ... <maybe more fields>
352 If we are given the struct directly (as our starting point) we
353 need to tell the debugger to:
355 1). Add the offset of the forwarding field.
357 2). Follow that pointer to get the real __Block_byref_x_VarName
358 struct to use (the real one may have been copied onto the heap).
360 3). Add the offset for the field VarName, to find the actual variable.
362 If we started with a pointer to the struct, then we need to
363 dereference that pointer first, before the other steps.
364 Translating this into DWARF ops, we will need to append the following
365 to the current location description for the variable:
367 DW_OP_deref -- optional, if we start with a pointer
368 DW_OP_plus_uconst <forward_fld_offset>
370 DW_OP_plus_uconst <varName_fld_offset>
372 That is what this function does. */
374 /// addBlockByrefAddress - Start with the address based on the location
375 /// provided, and generate the DWARF information necessary to find the
376 /// actual Block variable (navigating the Block struct) based on the
377 /// starting location. Add the DWARF information to the die. For
378 /// more information, read large comment just above here.
380 void CompileUnit::addBlockByrefAddress(DbgVariable *&DV, DIE *Die,
382 const MachineLocation &Location) {
383 DIType Ty = DV->getType();
385 unsigned Tag = Ty.getTag();
386 bool isPointer = false;
388 StringRef varName = DV->getName();
390 if (Tag == dwarf::DW_TAG_pointer_type) {
391 DIDerivedType DTy = DIDerivedType(Ty);
392 TmpTy = DTy.getTypeDerivedFrom();
396 DICompositeType blockStruct = DICompositeType(TmpTy);
398 // Find the __forwarding field and the variable field in the __Block_byref
400 DIArray Fields = blockStruct.getTypeArray();
401 DIDescriptor varField = DIDescriptor();
402 DIDescriptor forwardingField = DIDescriptor();
404 for (unsigned i = 0, N = Fields.getNumElements(); i < N; ++i) {
405 DIDescriptor Element = Fields.getElement(i);
406 DIDerivedType DT = DIDerivedType(Element);
407 StringRef fieldName = DT.getName();
408 if (fieldName == "__forwarding")
409 forwardingField = Element;
410 else if (fieldName == varName)
414 // Get the offsets for the forwarding field and the variable field.
415 unsigned forwardingFieldOffset =
416 DIDerivedType(forwardingField).getOffsetInBits() >> 3;
417 unsigned varFieldOffset =
418 DIDerivedType(varField).getOffsetInBits() >> 3;
420 // Decode the original location, and use that as the start of the byref
421 // variable's location.
422 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
423 unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
424 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
426 if (Location.isReg()) {
428 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + Reg);
430 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_regx);
431 addUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
435 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
437 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
438 addUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
441 addUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset());
444 // If we started with a pointer to the __Block_byref... struct, then
445 // the first thing we need to do is dereference the pointer (DW_OP_deref).
447 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
449 // Next add the offset for the '__forwarding' field:
450 // DW_OP_plus_uconst ForwardingFieldOffset. Note there's no point in
451 // adding the offset if it's 0.
452 if (forwardingFieldOffset > 0) {
453 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
454 addUInt(Block, 0, dwarf::DW_FORM_udata, forwardingFieldOffset);
457 // Now dereference the __forwarding field to get to the real __Block_byref
458 // struct: DW_OP_deref.
459 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
461 // Now that we've got the real __Block_byref... struct, add the offset
462 // for the variable's field to get to the location of the actual variable:
463 // DW_OP_plus_uconst varFieldOffset. Again, don't add if it's 0.
464 if (varFieldOffset > 0) {
465 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
466 addUInt(Block, 0, dwarf::DW_FORM_udata, varFieldOffset);
469 // Now attach the location information to the DIE.
470 addBlock(Die, Attribute, 0, Block);
473 /// isTypeSigned - Return true if the type is signed.
474 static bool isTypeSigned(DIType Ty, int *SizeInBits) {
475 if (Ty.isDerivedType())
476 return isTypeSigned(DIDerivedType(Ty).getTypeDerivedFrom(), SizeInBits);
477 if (Ty.isBasicType())
478 if (DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed
479 || DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed_char) {
480 *SizeInBits = Ty.getSizeInBits();
486 /// addConstantValue - Add constant value entry in variable DIE.
487 bool CompileUnit::addConstantValue(DIE *Die, const MachineOperand &MO,
489 assert(MO.isImm() && "Invalid machine operand!");
490 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
492 bool SignedConstant = isTypeSigned(Ty, &SizeInBits);
493 unsigned Form = SignedConstant ? dwarf::DW_FORM_sdata : dwarf::DW_FORM_udata;
494 switch (SizeInBits) {
495 case 8: Form = dwarf::DW_FORM_data1; break;
496 case 16: Form = dwarf::DW_FORM_data2; break;
497 case 32: Form = dwarf::DW_FORM_data4; break;
498 case 64: Form = dwarf::DW_FORM_data8; break;
501 SignedConstant ? addSInt(Block, 0, Form, MO.getImm())
502 : addUInt(Block, 0, Form, MO.getImm());
504 addBlock(Die, dwarf::DW_AT_const_value, 0, Block);
508 /// addConstantFPValue - Add constant value entry in variable DIE.
509 bool CompileUnit::addConstantFPValue(DIE *Die, const MachineOperand &MO) {
510 assert (MO.isFPImm() && "Invalid machine operand!");
511 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
512 APFloat FPImm = MO.getFPImm()->getValueAPF();
514 // Get the raw data form of the floating point.
515 const APInt FltVal = FPImm.bitcastToAPInt();
516 const char *FltPtr = (const char*)FltVal.getRawData();
518 int NumBytes = FltVal.getBitWidth() / 8; // 8 bits per byte.
519 bool LittleEndian = Asm->getTargetData().isLittleEndian();
520 int Incr = (LittleEndian ? 1 : -1);
521 int Start = (LittleEndian ? 0 : NumBytes - 1);
522 int Stop = (LittleEndian ? NumBytes : -1);
524 // Output the constant to DWARF one byte at a time.
525 for (; Start != Stop; Start += Incr)
526 addUInt(Block, 0, dwarf::DW_FORM_data1,
527 (unsigned char)0xFF & FltPtr[Start]);
529 addBlock(Die, dwarf::DW_AT_const_value, 0, Block);
533 /// addConstantValue - Add constant value entry in variable DIE.
534 bool CompileUnit::addConstantValue(DIE *Die, const ConstantInt *CI,
536 unsigned CIBitWidth = CI->getBitWidth();
537 if (CIBitWidth <= 64) {
539 switch (CIBitWidth) {
540 case 8: form = dwarf::DW_FORM_data1; break;
541 case 16: form = dwarf::DW_FORM_data2; break;
542 case 32: form = dwarf::DW_FORM_data4; break;
543 case 64: form = dwarf::DW_FORM_data8; break;
545 form = Unsigned ? dwarf::DW_FORM_udata : dwarf::DW_FORM_sdata;
548 addUInt(Die, dwarf::DW_AT_const_value, form, CI->getZExtValue());
550 addSInt(Die, dwarf::DW_AT_const_value, form, CI->getSExtValue());
554 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
556 // Get the raw data form of the large APInt.
557 const APInt Val = CI->getValue();
558 const uint64_t *Ptr64 = Val.getRawData();
560 int NumBytes = Val.getBitWidth() / 8; // 8 bits per byte.
561 bool LittleEndian = Asm->getTargetData().isLittleEndian();
563 // Output the constant to DWARF one byte at a time.
564 for (int i = 0; i < NumBytes; i++) {
567 c = Ptr64[i / 8] >> (8 * (i & 7));
569 c = Ptr64[(NumBytes - 1 - i) / 8] >> (8 * ((NumBytes - 1 - i) & 7));
570 addUInt(Block, 0, dwarf::DW_FORM_data1, c);
573 addBlock(Die, dwarf::DW_AT_const_value, 0, Block);
577 /// addTemplateParams - Add template parameters in buffer.
578 void CompileUnit::addTemplateParams(DIE &Buffer, DIArray TParams) {
579 // Add template parameters.
580 for (unsigned i = 0, e = TParams.getNumElements(); i != e; ++i) {
581 DIDescriptor Element = TParams.getElement(i);
582 if (Element.isTemplateTypeParameter())
583 Buffer.addChild(getOrCreateTemplateTypeParameterDIE(
584 DITemplateTypeParameter(Element)));
585 else if (Element.isTemplateValueParameter())
586 Buffer.addChild(getOrCreateTemplateValueParameterDIE(
587 DITemplateValueParameter(Element)));
591 /// addToContextOwner - Add Die into the list of its context owner's children.
592 void CompileUnit::addToContextOwner(DIE *Die, DIDescriptor Context) {
593 if (Context.isType()) {
594 DIE *ContextDIE = getOrCreateTypeDIE(DIType(Context));
595 ContextDIE->addChild(Die);
596 } else if (Context.isNameSpace()) {
597 DIE *ContextDIE = getOrCreateNameSpace(DINameSpace(Context));
598 ContextDIE->addChild(Die);
599 } else if (Context.isSubprogram()) {
600 DIE *ContextDIE = getOrCreateSubprogramDIE(DISubprogram(Context));
601 ContextDIE->addChild(Die);
602 } else if (DIE *ContextDIE = getDIE(Context))
603 ContextDIE->addChild(Die);
608 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
610 DIE *CompileUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
614 DIE *TyDIE = getDIE(Ty);
619 TyDIE = new DIE(dwarf::DW_TAG_base_type);
620 insertDIE(Ty, TyDIE);
621 if (Ty.isBasicType())
622 constructTypeDIE(*TyDIE, DIBasicType(Ty));
623 else if (Ty.isCompositeType())
624 constructTypeDIE(*TyDIE, DICompositeType(Ty));
626 assert(Ty.isDerivedType() && "Unknown kind of DIType");
627 constructTypeDIE(*TyDIE, DIDerivedType(Ty));
629 // If this is a named finished type then include it in the list of types
630 // for the accelerator tables.
631 if (!Ty.getName().empty() && !Ty.isForwardDecl()) {
632 bool IsImplementation = 0;
633 if (Ty.isCompositeType()) {
634 DICompositeType CT(Ty);
635 // A runtime language of 0 actually means C/C++ and that any
636 // non-negative value is some version of Objective-C/C++.
637 IsImplementation = (CT.getRunTimeLang() == 0) ||
638 CT.isObjcClassComplete();
640 unsigned Flags = IsImplementation ?
641 DwarfAccelTable::eTypeFlagClassIsImplementation : 0;
642 addAccelType(Ty.getName(), std::make_pair(TyDIE, Flags));
645 addToContextOwner(TyDIE, Ty.getContext());
649 /// addType - Add a new type attribute to the specified entity.
650 void CompileUnit::addType(DIE *Entity, DIType Ty,
651 unsigned Attribute) {
655 // Check for pre-existence.
656 DIEEntry *Entry = getDIEEntry(Ty);
657 // If it exists then use the existing value.
659 Entity->addValue(Attribute, dwarf::DW_FORM_ref4, Entry);
664 DIE *Buffer = getOrCreateTypeDIE(Ty);
667 Entry = createDIEEntry(Buffer);
668 insertDIEEntry(Ty, Entry);
669 Entity->addValue(Attribute, dwarf::DW_FORM_ref4, Entry);
671 // If this is a complete composite type then include it in the
672 // list of global types.
676 /// addGlobalType - Add a new global type to the compile unit.
678 void CompileUnit::addGlobalType(DIType Ty) {
679 DIDescriptor Context = Ty.getContext();
680 if (Ty.isCompositeType() && !Ty.getName().empty() && !Ty.isForwardDecl()
681 && (!Context || Context.isCompileUnit() || Context.isFile()
682 || Context.isNameSpace()))
683 if (DIEEntry *Entry = getDIEEntry(Ty))
684 GlobalTypes[Ty.getName()] = Entry->getEntry();
687 /// addPubTypes - Add type for pubtypes section.
688 void CompileUnit::addPubTypes(DISubprogram SP) {
689 DICompositeType SPTy = SP.getType();
690 unsigned SPTag = SPTy.getTag();
691 if (SPTag != dwarf::DW_TAG_subroutine_type)
694 DIArray Args = SPTy.getTypeArray();
695 for (unsigned i = 0, e = Args.getNumElements(); i != e; ++i) {
696 DIType ATy(Args.getElement(i));
703 /// constructTypeDIE - Construct basic type die from DIBasicType.
704 void CompileUnit::constructTypeDIE(DIE &Buffer, DIBasicType BTy) {
705 // Get core information.
706 StringRef Name = BTy.getName();
707 // Add name if not anonymous or intermediate type.
709 addString(&Buffer, dwarf::DW_AT_name, Name);
711 if (BTy.getTag() == dwarf::DW_TAG_unspecified_type) {
712 Buffer.setTag(dwarf::DW_TAG_unspecified_type);
713 // Unspecified types has only name, nothing else.
717 Buffer.setTag(dwarf::DW_TAG_base_type);
718 addUInt(&Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
721 uint64_t Size = BTy.getSizeInBits() >> 3;
722 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
725 /// constructTypeDIE - Construct derived type die from DIDerivedType.
726 void CompileUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
727 // Get core information.
728 StringRef Name = DTy.getName();
729 uint64_t Size = DTy.getSizeInBits() >> 3;
730 unsigned Tag = DTy.getTag();
732 // FIXME - Workaround for templates.
733 if (Tag == dwarf::DW_TAG_inheritance) Tag = dwarf::DW_TAG_reference_type;
737 // Map to main type, void will not have a type.
738 DIType FromTy = DTy.getTypeDerivedFrom();
739 addType(&Buffer, FromTy);
741 // Add name if not anonymous or intermediate type.
743 addString(&Buffer, dwarf::DW_AT_name, Name);
745 // Add size if non-zero (derived types might be zero-sized.)
746 if (Size && Tag != dwarf::DW_TAG_pointer_type)
747 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
749 // Add source line info if available and TyDesc is not a forward declaration.
750 if (!DTy.isForwardDecl())
751 addSourceLine(&Buffer, DTy);
754 /// constructTypeDIE - Construct type DIE from DICompositeType.
755 void CompileUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
756 // Get core information.
757 StringRef Name = CTy.getName();
759 uint64_t Size = CTy.getSizeInBits() >> 3;
760 unsigned Tag = CTy.getTag();
764 case dwarf::DW_TAG_vector_type:
765 case dwarf::DW_TAG_array_type:
766 constructArrayTypeDIE(Buffer, &CTy);
768 case dwarf::DW_TAG_enumeration_type: {
769 DIArray Elements = CTy.getTypeArray();
771 // Add enumerators to enumeration type.
772 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
774 DIDescriptor Enum(Elements.getElement(i));
775 if (Enum.isEnumerator()) {
776 ElemDie = constructEnumTypeDIE(DIEnumerator(Enum));
777 Buffer.addChild(ElemDie);
782 case dwarf::DW_TAG_subroutine_type: {
784 DIArray Elements = CTy.getTypeArray();
785 DIDescriptor RTy = Elements.getElement(0);
786 addType(&Buffer, DIType(RTy));
788 bool isPrototyped = true;
790 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
791 DIDescriptor Ty = Elements.getElement(i);
792 if (Ty.isUnspecifiedParameter()) {
793 DIE *Arg = new DIE(dwarf::DW_TAG_unspecified_parameters);
794 Buffer.addChild(Arg);
795 isPrototyped = false;
797 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
798 addType(Arg, DIType(Ty));
799 Buffer.addChild(Arg);
802 // Add prototype flag if we're dealing with a C language and the
803 // function has been prototyped.
805 (Language == dwarf::DW_LANG_C89 ||
806 Language == dwarf::DW_LANG_C99 ||
807 Language == dwarf::DW_LANG_ObjC))
808 addUInt(&Buffer, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
811 case dwarf::DW_TAG_structure_type:
812 case dwarf::DW_TAG_union_type:
813 case dwarf::DW_TAG_class_type: {
814 // Add elements to structure type.
815 DIArray Elements = CTy.getTypeArray();
817 // A forward struct declared type may not have elements available.
818 unsigned N = Elements.getNumElements();
822 // Add elements to structure type.
823 for (unsigned i = 0; i < N; ++i) {
824 DIDescriptor Element = Elements.getElement(i);
826 if (Element.isSubprogram()) {
827 DISubprogram SP(Element);
828 ElemDie = getOrCreateSubprogramDIE(DISubprogram(Element));
829 if (SP.isProtected())
830 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
831 dwarf::DW_ACCESS_protected);
832 else if (SP.isPrivate())
833 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
834 dwarf::DW_ACCESS_private);
836 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
837 dwarf::DW_ACCESS_public);
839 addUInt(ElemDie, dwarf::DW_AT_explicit, dwarf::DW_FORM_flag, 1);
841 else if (Element.isVariable()) {
842 DIVariable DV(Element);
843 ElemDie = new DIE(dwarf::DW_TAG_variable);
844 addString(ElemDie, dwarf::DW_AT_name, DV.getName());
845 addType(ElemDie, DV.getType());
846 addUInt(ElemDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
847 addUInt(ElemDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
848 addSourceLine(ElemDie, DV);
849 } else if (Element.isDerivedType()) {
850 DIDerivedType DDTy(Element);
851 if (DDTy.getTag() == dwarf::DW_TAG_friend) {
852 ElemDie = new DIE(dwarf::DW_TAG_friend);
853 addType(ElemDie, DDTy.getTypeDerivedFrom(), dwarf::DW_AT_friend);
855 ElemDie = createMemberDIE(DIDerivedType(Element));
856 } else if (Element.isObjCProperty()) {
857 DIObjCProperty Property(Element);
858 ElemDie = new DIE(Property.getTag());
859 StringRef PropertyName = Property.getObjCPropertyName();
860 addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
861 addType(ElemDie, Property.getType());
862 addSourceLine(ElemDie, Property);
863 StringRef GetterName = Property.getObjCPropertyGetterName();
864 if (!GetterName.empty())
865 addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
866 StringRef SetterName = Property.getObjCPropertySetterName();
867 if (!SetterName.empty())
868 addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
869 unsigned PropertyAttributes = 0;
870 if (Property.isReadOnlyObjCProperty())
871 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readonly;
872 if (Property.isReadWriteObjCProperty())
873 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readwrite;
874 if (Property.isAssignObjCProperty())
875 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_assign;
876 if (Property.isRetainObjCProperty())
877 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_retain;
878 if (Property.isCopyObjCProperty())
879 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_copy;
880 if (Property.isNonAtomicObjCProperty())
881 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_nonatomic;
882 if (PropertyAttributes)
883 addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, 0,
886 DIEEntry *Entry = getDIEEntry(Element);
888 Entry = createDIEEntry(ElemDie);
889 insertDIEEntry(Element, Entry);
893 Buffer.addChild(ElemDie);
896 if (CTy.isAppleBlockExtension())
897 addUInt(&Buffer, dwarf::DW_AT_APPLE_block, dwarf::DW_FORM_flag, 1);
899 DICompositeType ContainingType = CTy.getContainingType();
900 if (DIDescriptor(ContainingType).isCompositeType())
901 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4,
902 getOrCreateTypeDIE(DIType(ContainingType)));
904 DIDescriptor Context = CTy.getContext();
905 addToContextOwner(&Buffer, Context);
908 if (CTy.isObjcClassComplete())
909 addUInt(&Buffer, dwarf::DW_AT_APPLE_objc_complete_type,
910 dwarf::DW_FORM_flag, 1);
912 // Add template parameters to a class, structure or union types.
913 // FIXME: The support isn't in the metadata for this yet.
914 if (Tag == dwarf::DW_TAG_class_type ||
915 Tag == dwarf::DW_TAG_structure_type ||
916 Tag == dwarf::DW_TAG_union_type)
917 addTemplateParams(Buffer, CTy.getTemplateParams());
925 // Add name if not anonymous or intermediate type.
927 addString(&Buffer, dwarf::DW_AT_name, Name);
929 if (Tag == dwarf::DW_TAG_enumeration_type || Tag == dwarf::DW_TAG_class_type
930 || Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type)
932 // Add size if non-zero (derived types might be zero-sized.)
934 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
936 // Add zero size if it is not a forward declaration.
937 if (CTy.isForwardDecl())
938 addUInt(&Buffer, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
940 addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, 0);
943 // Add source line info if available.
944 if (!CTy.isForwardDecl())
945 addSourceLine(&Buffer, CTy);
947 // No harm in adding the runtime language to the declaration.
948 unsigned RLang = CTy.getRunTimeLang();
950 addUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class,
951 dwarf::DW_FORM_data1, RLang);
955 /// getOrCreateTemplateTypeParameterDIE - Find existing DIE or create new DIE
956 /// for the given DITemplateTypeParameter.
958 CompileUnit::getOrCreateTemplateTypeParameterDIE(DITemplateTypeParameter TP) {
959 DIE *ParamDIE = getDIE(TP);
963 ParamDIE = new DIE(dwarf::DW_TAG_template_type_parameter);
964 addType(ParamDIE, TP.getType());
965 addString(ParamDIE, dwarf::DW_AT_name, TP.getName());
969 /// getOrCreateTemplateValueParameterDIE - Find existing DIE or create new DIE
970 /// for the given DITemplateValueParameter.
972 CompileUnit::getOrCreateTemplateValueParameterDIE(DITemplateValueParameter TPV) {
973 DIE *ParamDIE = getDIE(TPV);
977 ParamDIE = new DIE(dwarf::DW_TAG_template_value_parameter);
978 addType(ParamDIE, TPV.getType());
979 if (!TPV.getName().empty())
980 addString(ParamDIE, dwarf::DW_AT_name, TPV.getName());
981 addUInt(ParamDIE, dwarf::DW_AT_const_value, dwarf::DW_FORM_udata,
986 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
987 DIE *CompileUnit::getOrCreateNameSpace(DINameSpace NS) {
988 DIE *NDie = getDIE(NS);
991 NDie = new DIE(dwarf::DW_TAG_namespace);
993 if (!NS.getName().empty()) {
994 addString(NDie, dwarf::DW_AT_name, NS.getName());
995 addAccelNamespace(NS.getName(), NDie);
997 addAccelNamespace("(anonymous namespace)", NDie);
998 addSourceLine(NDie, NS);
999 addToContextOwner(NDie, NS.getContext());
1003 /// getRealLinkageName - If special LLVM prefix that is used to inform the asm
1004 /// printer to not emit usual symbol prefix before the symbol name is used then
1005 /// return linkage name after skipping this special LLVM prefix.
1006 static StringRef getRealLinkageName(StringRef LinkageName) {
1008 if (LinkageName.startswith(StringRef(&One, 1)))
1009 return LinkageName.substr(1);
1013 /// getOrCreateSubprogramDIE - Create new DIE using SP.
1014 DIE *CompileUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
1015 DIE *SPDie = getDIE(SP);
1019 DISubprogram SPDecl = SP.getFunctionDeclaration();
1020 DIE *DeclDie = NULL;
1021 if (SPDecl.isSubprogram()) {
1022 DeclDie = getOrCreateSubprogramDIE(SPDecl);
1025 SPDie = new DIE(dwarf::DW_TAG_subprogram);
1027 // DW_TAG_inlined_subroutine may refer to this DIE.
1028 insertDIE(SP, SPDie);
1030 // Add to context owner.
1031 addToContextOwner(SPDie, SP.getContext());
1033 // Add function template parameters.
1034 addTemplateParams(*SPDie, SP.getTemplateParams());
1036 // Unfortunately this code needs to stay here instead of below the
1037 // AT_specification code in order to work around a bug in older
1038 // gdbs that requires the linkage name to resolve multiple template
1040 StringRef LinkageName = SP.getLinkageName();
1041 if (!LinkageName.empty())
1042 addString(SPDie, dwarf::DW_AT_MIPS_linkage_name,
1043 getRealLinkageName(LinkageName));
1045 // If this DIE is going to refer declaration info using AT_specification
1046 // then there is no need to add other attributes.
1048 // Refer function declaration directly.
1049 addDIEEntry(SPDie, dwarf::DW_AT_specification, dwarf::DW_FORM_ref4,
1055 // Constructors and operators for anonymous aggregates do not have names.
1056 if (!SP.getName().empty())
1057 addString(SPDie, dwarf::DW_AT_name, SP.getName());
1059 addSourceLine(SPDie, SP);
1061 // Add the prototype if we have a prototype and we have a C like
1063 if (SP.isPrototyped() &&
1064 (Language == dwarf::DW_LANG_C89 ||
1065 Language == dwarf::DW_LANG_C99 ||
1066 Language == dwarf::DW_LANG_ObjC))
1067 addUInt(SPDie, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
1070 DICompositeType SPTy = SP.getType();
1071 DIArray Args = SPTy.getTypeArray();
1072 unsigned SPTag = SPTy.getTag();
1074 if (Args.getNumElements() == 0 || SPTag != dwarf::DW_TAG_subroutine_type)
1075 addType(SPDie, SPTy);
1077 addType(SPDie, DIType(Args.getElement(0)));
1079 unsigned VK = SP.getVirtuality();
1081 addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
1082 DIEBlock *Block = getDIEBlock();
1083 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1084 addUInt(Block, 0, dwarf::DW_FORM_udata, SP.getVirtualIndex());
1085 addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, 0, Block);
1086 ContainingTypeMap.insert(std::make_pair(SPDie,
1087 SP.getContainingType()));
1090 if (!SP.isDefinition()) {
1091 addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
1093 // Add arguments. Do not add arguments for subprogram definition. They will
1094 // be handled while processing variables.
1095 DICompositeType SPTy = SP.getType();
1096 DIArray Args = SPTy.getTypeArray();
1097 unsigned SPTag = SPTy.getTag();
1099 if (SPTag == dwarf::DW_TAG_subroutine_type)
1100 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
1101 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
1102 DIType ATy = DIType(DIType(Args.getElement(i)));
1104 if (ATy.isArtificial())
1105 addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
1106 SPDie->addChild(Arg);
1110 if (SP.isArtificial())
1111 addUInt(SPDie, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
1113 if (!SP.isLocalToUnit())
1114 addUInt(SPDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
1116 if (SP.isOptimized())
1117 addUInt(SPDie, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1);
1119 if (unsigned isa = Asm->getISAEncoding()) {
1120 addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
1126 // Return const expression if value is a GEP to access merged global
1128 // i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
1129 static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
1130 const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
1131 if (!CE || CE->getNumOperands() != 3 ||
1132 CE->getOpcode() != Instruction::GetElementPtr)
1135 // First operand points to a global struct.
1136 Value *Ptr = CE->getOperand(0);
1137 if (!isa<GlobalValue>(Ptr) ||
1138 !isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
1141 // Second operand is zero.
1142 const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
1143 if (!CI || !CI->isZero())
1146 // Third operand is offset.
1147 if (!isa<ConstantInt>(CE->getOperand(2)))
1153 /// createGlobalVariableDIE - create global variable DIE.
1154 void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
1155 // Check for pre-existence.
1159 DIGlobalVariable GV(N);
1163 DIE *VariableDIE = new DIE(GV.getTag());
1165 insertDIE(N, VariableDIE);
1168 addString(VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
1169 StringRef LinkageName = GV.getLinkageName();
1170 bool isGlobalVariable = GV.getGlobal() != NULL;
1171 if (!LinkageName.empty() && isGlobalVariable)
1172 addString(VariableDIE, dwarf::DW_AT_MIPS_linkage_name,
1173 getRealLinkageName(LinkageName));
1175 DIType GTy = GV.getType();
1176 addType(VariableDIE, GTy);
1178 // Add scoping info.
1179 if (!GV.isLocalToUnit())
1180 addUInt(VariableDIE, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
1182 // Add line number info.
1183 addSourceLine(VariableDIE, GV);
1184 // Add to context owner.
1185 DIDescriptor GVContext = GV.getContext();
1186 addToContextOwner(VariableDIE, GVContext);
1188 bool addToAccelTable = false;
1189 DIE *VariableSpecDIE = NULL;
1190 if (isGlobalVariable) {
1191 addToAccelTable = true;
1192 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1193 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
1194 addLabel(Block, 0, dwarf::DW_FORM_udata,
1195 Asm->Mang->getSymbol(GV.getGlobal()));
1196 // Do not create specification DIE if context is either compile unit
1198 if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
1199 !GVContext.isFile() && !isSubprogramContext(GVContext)) {
1200 // Create specification DIE.
1201 VariableSpecDIE = new DIE(dwarf::DW_TAG_variable);
1202 addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification,
1203 dwarf::DW_FORM_ref4, VariableDIE);
1204 addBlock(VariableSpecDIE, dwarf::DW_AT_location, 0, Block);
1205 addUInt(VariableDIE, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag,
1207 addDie(VariableSpecDIE);
1209 addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
1211 } else if (const ConstantInt *CI =
1212 dyn_cast_or_null<ConstantInt>(GV.getConstant()))
1213 addConstantValue(VariableDIE, CI, GTy.isUnsignedDIType());
1214 else if (const ConstantExpr *CE = getMergedGlobalExpr(N->getOperand(11))) {
1215 addToAccelTable = true;
1216 // GV is a merged global.
1217 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1218 Value *Ptr = CE->getOperand(0);
1219 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
1220 addLabel(Block, 0, dwarf::DW_FORM_udata,
1221 Asm->Mang->getSymbol(cast<GlobalValue>(Ptr)));
1222 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1223 SmallVector<Value*, 3> Idx(CE->op_begin()+1, CE->op_end());
1224 addUInt(Block, 0, dwarf::DW_FORM_udata,
1225 Asm->getTargetData().getIndexedOffset(Ptr->getType(), Idx));
1226 addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1227 addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
1230 if (addToAccelTable) {
1231 DIE *AddrDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
1232 addAccelName(GV.getName(), AddrDIE);
1234 // If the linkage name is different than the name, go ahead and output
1235 // that as well into the name table.
1236 if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
1237 addAccelName(GV.getLinkageName(), AddrDIE);
1243 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
1244 void CompileUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy){
1245 DIE *DW_Subrange = new DIE(dwarf::DW_TAG_subrange_type);
1246 addDIEEntry(DW_Subrange, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, IndexTy);
1247 uint64_t L = SR.getLo();
1248 uint64_t H = SR.getHi();
1250 // The L value defines the lower bounds which is typically zero for C/C++. The
1251 // H value is the upper bounds. Values are 64 bit. H - L + 1 is the size
1252 // of the array. If L > H then do not emit DW_AT_lower_bound and
1253 // DW_AT_upper_bound attributes. If L is zero and H is also zero then the
1254 // array has one element and in such case do not emit lower bound.
1257 Buffer.addChild(DW_Subrange);
1261 addUInt(DW_Subrange, dwarf::DW_AT_lower_bound, 0, L);
1262 addUInt(DW_Subrange, dwarf::DW_AT_upper_bound, 0, H);
1263 Buffer.addChild(DW_Subrange);
1266 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
1267 void CompileUnit::constructArrayTypeDIE(DIE &Buffer,
1268 DICompositeType *CTy) {
1269 Buffer.setTag(dwarf::DW_TAG_array_type);
1270 if (CTy->getTag() == dwarf::DW_TAG_vector_type)
1271 addUInt(&Buffer, dwarf::DW_AT_GNU_vector, dwarf::DW_FORM_flag, 1);
1273 // Emit derived type.
1274 addType(&Buffer, CTy->getTypeDerivedFrom());
1275 DIArray Elements = CTy->getTypeArray();
1277 // Get an anonymous type for index type.
1278 DIE *IdxTy = getIndexTyDie();
1280 // Construct an anonymous type for index type.
1281 IdxTy = new DIE(dwarf::DW_TAG_base_type);
1282 addUInt(IdxTy, dwarf::DW_AT_byte_size, 0, sizeof(int32_t));
1283 addUInt(IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1284 dwarf::DW_ATE_signed);
1286 setIndexTyDie(IdxTy);
1289 // Add subranges to array type.
1290 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1291 DIDescriptor Element = Elements.getElement(i);
1292 if (Element.getTag() == dwarf::DW_TAG_subrange_type)
1293 constructSubrangeDIE(Buffer, DISubrange(Element), IdxTy);
1297 /// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
1298 DIE *CompileUnit::constructEnumTypeDIE(DIEnumerator ETy) {
1299 DIE *Enumerator = new DIE(dwarf::DW_TAG_enumerator);
1300 StringRef Name = ETy.getName();
1301 addString(Enumerator, dwarf::DW_AT_name, Name);
1302 int64_t Value = ETy.getEnumValue();
1303 addSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, Value);
1307 /// constructContainingTypeDIEs - Construct DIEs for types that contain
1309 void CompileUnit::constructContainingTypeDIEs() {
1310 for (DenseMap<DIE *, const MDNode *>::iterator CI = ContainingTypeMap.begin(),
1311 CE = ContainingTypeMap.end(); CI != CE; ++CI) {
1312 DIE *SPDie = CI->first;
1313 const MDNode *N = CI->second;
1315 DIE *NDie = getDIE(N);
1316 if (!NDie) continue;
1317 addDIEEntry(SPDie, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4, NDie);
1321 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
1322 DIE *CompileUnit::constructVariableDIE(DbgVariable *DV, bool isScopeAbstract) {
1323 StringRef Name = DV->getName();
1327 // Translate tag to proper Dwarf tag.
1328 unsigned Tag = DV->getTag();
1330 // Define variable debug information entry.
1331 DIE *VariableDie = new DIE(Tag);
1332 DbgVariable *AbsVar = DV->getAbstractVariable();
1333 DIE *AbsDIE = AbsVar ? AbsVar->getDIE() : NULL;
1335 addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin,
1336 dwarf::DW_FORM_ref4, AbsDIE);
1338 addString(VariableDie, dwarf::DW_AT_name, Name);
1339 addSourceLine(VariableDie, DV->getVariable());
1340 addType(VariableDie, DV->getType());
1343 if (DV->isArtificial())
1344 addUInt(VariableDie, dwarf::DW_AT_artificial,
1345 dwarf::DW_FORM_flag, 1);
1347 if (isScopeAbstract) {
1348 DV->setDIE(VariableDie);
1352 // Add variable address.
1354 unsigned Offset = DV->getDotDebugLocOffset();
1355 if (Offset != ~0U) {
1356 addLabel(VariableDie, dwarf::DW_AT_location,
1357 dwarf::DW_FORM_data4,
1358 Asm->GetTempSymbol("debug_loc", Offset));
1359 DV->setDIE(VariableDie);
1363 // Check if variable is described by a DBG_VALUE instruction.
1364 if (const MachineInstr *DVInsn = DV->getMInsn()) {
1365 bool updated = false;
1366 if (DVInsn->getNumOperands() == 3) {
1367 if (DVInsn->getOperand(0).isReg()) {
1368 const MachineOperand RegOp = DVInsn->getOperand(0);
1369 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
1370 if (DVInsn->getOperand(1).isImm() &&
1371 TRI->getFrameRegister(*Asm->MF) == RegOp.getReg()) {
1372 unsigned FrameReg = 0;
1373 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
1375 TFI->getFrameIndexReference(*Asm->MF,
1376 DVInsn->getOperand(1).getImm(),
1378 MachineLocation Location(FrameReg, Offset);
1379 addVariableAddress(DV, VariableDie, Location);
1381 } else if (RegOp.getReg())
1382 addVariableAddress(DV, VariableDie,
1383 MachineLocation(RegOp.getReg()));
1386 else if (DVInsn->getOperand(0).isImm())
1388 addConstantValue(VariableDie, DVInsn->getOperand(0),
1390 else if (DVInsn->getOperand(0).isFPImm())
1392 addConstantFPValue(VariableDie, DVInsn->getOperand(0));
1393 else if (DVInsn->getOperand(0).isCImm())
1395 addConstantValue(VariableDie,
1396 DVInsn->getOperand(0).getCImm(),
1397 DV->getType().isUnsignedDIType());
1399 addVariableAddress(DV, VariableDie,
1400 Asm->getDebugValueLocation(DVInsn));
1404 // If variableDie is not updated then DBG_VALUE instruction does not
1405 // have valid variable info.
1409 DV->setDIE(VariableDie);
1412 // .. else use frame index.
1413 int FI = DV->getFrameIndex();
1415 unsigned FrameReg = 0;
1416 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
1418 TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
1419 MachineLocation Location(FrameReg, Offset);
1420 addVariableAddress(DV, VariableDie, Location);
1424 DV->setDIE(VariableDie);
1428 /// createMemberDIE - Create new member DIE.
1429 DIE *CompileUnit::createMemberDIE(DIDerivedType DT) {
1430 DIE *MemberDie = new DIE(DT.getTag());
1431 StringRef Name = DT.getName();
1433 addString(MemberDie, dwarf::DW_AT_name, Name);
1435 addType(MemberDie, DT.getTypeDerivedFrom());
1437 addSourceLine(MemberDie, DT);
1439 DIEBlock *MemLocationDie = new (DIEValueAllocator) DIEBlock();
1440 addUInt(MemLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
1442 uint64_t Size = DT.getSizeInBits();
1443 uint64_t FieldSize = DT.getOriginalTypeSize();
1445 if (Size != FieldSize) {
1447 addUInt(MemberDie, dwarf::DW_AT_byte_size, 0, DT.getOriginalTypeSize()>>3);
1448 addUInt(MemberDie, dwarf::DW_AT_bit_size, 0, DT.getSizeInBits());
1450 uint64_t Offset = DT.getOffsetInBits();
1451 uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
1452 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1453 uint64_t FieldOffset = (HiMark - FieldSize);
1454 Offset -= FieldOffset;
1456 // Maybe we need to work from the other end.
1457 if (Asm->getTargetData().isLittleEndian())
1458 Offset = FieldSize - (Offset + Size);
1459 addUInt(MemberDie, dwarf::DW_AT_bit_offset, 0, Offset);
1461 // Here WD_AT_data_member_location points to the anonymous
1462 // field that includes this bit field.
1463 addUInt(MemLocationDie, 0, dwarf::DW_FORM_udata, FieldOffset >> 3);
1466 // This is not a bitfield.
1467 addUInt(MemLocationDie, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits() >> 3);
1469 if (DT.getTag() == dwarf::DW_TAG_inheritance
1470 && DT.isVirtual()) {
1472 // For C++, virtual base classes are not at fixed offset. Use following
1473 // expression to extract appropriate offset from vtable.
1474 // BaseAddr = ObAddr + *((*ObAddr) - Offset)
1476 DIEBlock *VBaseLocationDie = new (DIEValueAllocator) DIEBlock();
1477 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
1478 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1479 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1480 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits());
1481 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
1482 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1483 addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1485 addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0,
1488 addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0, MemLocationDie);
1490 if (DT.isProtected())
1491 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1492 dwarf::DW_ACCESS_protected);
1493 else if (DT.isPrivate())
1494 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1495 dwarf::DW_ACCESS_private);
1496 // Otherwise C++ member and base classes are considered public.
1498 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1499 dwarf::DW_ACCESS_public);
1501 addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1,
1502 dwarf::DW_VIRTUALITY_virtual);
1504 // Objective-C properties.
1505 if (MDNode *PNode = DT.getObjCProperty())
1506 if (DIEEntry *PropertyDie = getDIEEntry(PNode))
1507 MemberDie->addValue(dwarf::DW_AT_APPLE_property, dwarf::DW_FORM_ref4,
1510 // This is only for backward compatibility.
1511 StringRef PropertyName = DT.getObjCPropertyName();
1512 if (!PropertyName.empty()) {
1513 addString(MemberDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
1514 StringRef GetterName = DT.getObjCPropertyGetterName();
1515 if (!GetterName.empty())
1516 addString(MemberDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
1517 StringRef SetterName = DT.getObjCPropertySetterName();
1518 if (!SetterName.empty())
1519 addString(MemberDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
1520 unsigned PropertyAttributes = 0;
1521 if (DT.isReadOnlyObjCProperty())
1522 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readonly;
1523 if (DT.isReadWriteObjCProperty())
1524 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readwrite;
1525 if (DT.isAssignObjCProperty())
1526 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_assign;
1527 if (DT.isRetainObjCProperty())
1528 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_retain;
1529 if (DT.isCopyObjCProperty())
1530 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_copy;
1531 if (DT.isNonAtomicObjCProperty())
1532 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_nonatomic;
1533 if (PropertyAttributes)
1534 addUInt(MemberDie, dwarf::DW_AT_APPLE_property_attribute, 0,
1535 PropertyAttributes);