1 //===-- llvm/CodeGen/DwarfCompileUnit.cpp - Dwarf Compile Unit ------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains support for constructing a dwarf compile unit.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "dwarfdebug"
16 #include "DwarfCompileUnit.h"
17 #include "DwarfAccelTable.h"
18 #include "DwarfDebug.h"
19 #include "llvm/ADT/APFloat.h"
20 #include "llvm/DIBuilder.h"
21 #include "llvm/IR/Constants.h"
22 #include "llvm/IR/DataLayout.h"
23 #include "llvm/IR/GlobalVariable.h"
24 #include "llvm/IR/Instructions.h"
25 #include "llvm/MC/MCSection.h"
26 #include "llvm/MC/MCStreamer.h"
27 #include "llvm/Target/Mangler.h"
28 #include "llvm/Target/TargetFrameLowering.h"
29 #include "llvm/Target/TargetMachine.h"
30 #include "llvm/Target/TargetLoweringObjectFile.h"
31 #include "llvm/Target/TargetRegisterInfo.h"
35 /// CompileUnit - Compile unit constructor.
36 CompileUnit::CompileUnit(unsigned UID, DIE *D, DICompileUnit Node,
37 AsmPrinter *A, DwarfDebug *DW, DwarfUnits *DWU)
38 : UniqueID(UID), Node(Node), CUDie(D), Asm(A), DD(DW), DU(DWU),
39 IndexTyDie(0), DebugInfoOffset(0) {
40 DIEIntegerOne = new (DIEValueAllocator) DIEInteger(1);
44 /// ~CompileUnit - Destructor for compile unit.
45 CompileUnit::~CompileUnit() {
46 for (unsigned j = 0, M = DIEBlocks.size(); j < M; ++j)
47 DIEBlocks[j]->~DIEBlock();
50 /// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
51 /// information entry.
52 DIEEntry *CompileUnit::createDIEEntry(DIE *Entry) {
53 DIEEntry *Value = new (DIEValueAllocator) DIEEntry(Entry);
57 /// getDefaultLowerBound - Return the default lower bound for an array. If the
58 /// DWARF version doesn't handle the language, return -1.
59 int64_t CompileUnit::getDefaultLowerBound() const {
60 switch (getLanguage()) {
64 case dwarf::DW_LANG_C89:
65 case dwarf::DW_LANG_C99:
66 case dwarf::DW_LANG_C:
67 case dwarf::DW_LANG_C_plus_plus:
68 case dwarf::DW_LANG_ObjC:
69 case dwarf::DW_LANG_ObjC_plus_plus:
72 case dwarf::DW_LANG_Fortran77:
73 case dwarf::DW_LANG_Fortran90:
74 case dwarf::DW_LANG_Fortran95:
77 // The languages below have valid values only if the DWARF version >= 4.
78 case dwarf::DW_LANG_Java:
79 case dwarf::DW_LANG_Python:
80 case dwarf::DW_LANG_UPC:
81 case dwarf::DW_LANG_D:
82 if (dwarf::DWARF_VERSION >= 4)
86 case dwarf::DW_LANG_Ada83:
87 case dwarf::DW_LANG_Ada95:
88 case dwarf::DW_LANG_Cobol74:
89 case dwarf::DW_LANG_Cobol85:
90 case dwarf::DW_LANG_Modula2:
91 case dwarf::DW_LANG_Pascal83:
92 case dwarf::DW_LANG_PLI:
93 if (dwarf::DWARF_VERSION >= 4)
101 /// Check whether the DIE for this MDNode can be shared across CUs.
102 static bool isShareableAcrossCUs(DIDescriptor D) {
103 // When the MDNode can be part of the type system, the DIE can be
104 // shared across CUs.
106 (D.isSubprogram() && !DISubprogram(D).isDefinition());
109 /// getDIE - Returns the debug information entry map slot for the
110 /// specified debug variable. We delegate the request to DwarfDebug
111 /// when the DIE for this MDNode can be shared across CUs. The mappings
112 /// will be kept in DwarfDebug for shareable DIEs.
113 DIE *CompileUnit::getDIE(DIDescriptor D) const {
114 if (isShareableAcrossCUs(D))
115 return DD->getDIE(D);
116 return MDNodeToDieMap.lookup(D);
119 /// insertDIE - Insert DIE into the map. We delegate the request to DwarfDebug
120 /// when the DIE for this MDNode can be shared across CUs. The mappings
121 /// will be kept in DwarfDebug for shareable DIEs.
122 void CompileUnit::insertDIE(DIDescriptor Desc, DIE *D) {
123 if (isShareableAcrossCUs(Desc)) {
124 DD->insertDIE(Desc, D);
127 MDNodeToDieMap.insert(std::make_pair(Desc, D));
130 /// addFlag - Add a flag that is true.
131 void CompileUnit::addFlag(DIE *Die, dwarf::Attribute Attribute) {
132 if (DD->getDwarfVersion() >= 4)
133 Die->addValue(Attribute, dwarf::DW_FORM_flag_present, DIEIntegerOne);
135 Die->addValue(Attribute, dwarf::DW_FORM_flag, DIEIntegerOne);
138 /// addUInt - Add an unsigned integer attribute data and value.
140 void CompileUnit::addUInt(DIE *Die, dwarf::Attribute Attribute,
141 Optional<dwarf::Form> Form, uint64_t Integer) {
143 Form = DIEInteger::BestForm(false, Integer);
144 DIEValue *Value = Integer == 1 ? DIEIntegerOne : new (DIEValueAllocator)
146 Die->addValue(Attribute, *Form, Value);
149 void CompileUnit::addUInt(DIEBlock *Block, dwarf::Form Form, uint64_t Integer) {
150 addUInt(Block, (dwarf::Attribute)0, Form, Integer);
153 /// addSInt - Add an signed integer attribute data and value.
155 void CompileUnit::addSInt(DIE *Die, dwarf::Attribute Attribute,
156 Optional<dwarf::Form> Form, int64_t Integer) {
158 Form = DIEInteger::BestForm(true, Integer);
159 DIEValue *Value = new (DIEValueAllocator) DIEInteger(Integer);
160 Die->addValue(Attribute, *Form, Value);
163 void CompileUnit::addSInt(DIEBlock *Die, Optional<dwarf::Form> Form,
165 addSInt(Die, (dwarf::Attribute)0, Form, Integer);
168 /// addString - Add a string attribute data and value. We always emit a
169 /// reference to the string pool instead of immediate strings so that DIEs have
170 /// more predictable sizes. In the case of split dwarf we emit an index
171 /// into another table which gets us the static offset into the string
173 void CompileUnit::addString(DIE *Die, dwarf::Attribute Attribute,
177 if (!DD->useSplitDwarf()) {
178 MCSymbol *Symb = DU->getStringPoolEntry(String);
179 if (Asm->needsRelocationsForDwarfStringPool())
180 Value = new (DIEValueAllocator) DIELabel(Symb);
182 MCSymbol *StringPool = DU->getStringPoolSym();
183 Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool);
185 Form = dwarf::DW_FORM_strp;
187 unsigned idx = DU->getStringPoolIndex(String);
188 Value = new (DIEValueAllocator) DIEInteger(idx);
189 Form = dwarf::DW_FORM_GNU_str_index;
191 DIEValue *Str = new (DIEValueAllocator) DIEString(Value, String);
192 Die->addValue(Attribute, Form, Str);
195 /// addLocalString - Add a string attribute data and value. This is guaranteed
196 /// to be in the local string pool instead of indirected.
197 void CompileUnit::addLocalString(DIE *Die, dwarf::Attribute Attribute,
199 MCSymbol *Symb = DU->getStringPoolEntry(String);
201 if (Asm->needsRelocationsForDwarfStringPool())
202 Value = new (DIEValueAllocator) DIELabel(Symb);
204 MCSymbol *StringPool = DU->getStringPoolSym();
205 Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool);
207 Die->addValue(Attribute, dwarf::DW_FORM_strp, Value);
210 /// addExpr - Add a Dwarf expression attribute data and value.
212 void CompileUnit::addExpr(DIEBlock *Die, dwarf::Form Form, const MCExpr *Expr) {
213 DIEValue *Value = new (DIEValueAllocator) DIEExpr(Expr);
214 Die->addValue((dwarf::Attribute)0, Form, Value);
217 /// addLabel - Add a Dwarf label attribute data and value.
219 void CompileUnit::addLabel(DIE *Die, dwarf::Attribute Attribute,
220 dwarf::Form Form, const MCSymbol *Label) {
221 DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
222 Die->addValue(Attribute, Form, Value);
225 void CompileUnit::addLabel(DIEBlock *Die, dwarf::Form Form,
226 const MCSymbol *Label) {
227 addLabel(Die, (dwarf::Attribute)0, Form, Label);
230 /// addLabelAddress - Add a dwarf label attribute data and value using
231 /// DW_FORM_addr or DW_FORM_GNU_addr_index.
233 void CompileUnit::addLabelAddress(DIE *Die, dwarf::Attribute Attribute,
236 DD->addArangeLabel(SymbolCU(this, Label));
238 if (!DD->useSplitDwarf()) {
240 DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
241 Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
243 DIEValue *Value = new (DIEValueAllocator) DIEInteger(0);
244 Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
247 unsigned idx = DU->getAddrPoolIndex(Label);
248 DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
249 Die->addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, Value);
253 /// addOpAddress - Add a dwarf op address data and value using the
254 /// form given and an op of either DW_FORM_addr or DW_FORM_GNU_addr_index.
256 void CompileUnit::addOpAddress(DIEBlock *Die, const MCSymbol *Sym) {
257 DD->addArangeLabel(SymbolCU(this, Sym));
258 if (!DD->useSplitDwarf()) {
259 addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
260 addLabel(Die, dwarf::DW_FORM_udata, Sym);
262 addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_addr_index);
263 addUInt(Die, dwarf::DW_FORM_GNU_addr_index, DU->getAddrPoolIndex(Sym));
267 /// addDelta - Add a label delta attribute data and value.
269 void CompileUnit::addDelta(DIE *Die, dwarf::Attribute Attribute,
270 dwarf::Form Form, const MCSymbol *Hi,
271 const MCSymbol *Lo) {
272 DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo);
273 Die->addValue(Attribute, Form, Value);
276 /// addDIEEntry - Add a DIE attribute data and value.
278 void CompileUnit::addDIEEntry(DIE *Die, dwarf::Attribute Attribute,
280 addDIEEntry(Die, Attribute, createDIEEntry(Entry));
283 void CompileUnit::addDIEEntry(DIE *Die, dwarf::Attribute Attribute,
285 const DIE *DieCU = Die->getCompileUnitOrNull();
286 const DIE *EntryCU = Entry->getEntry()->getCompileUnitOrNull();
288 // We assume that Die belongs to this CU, if it is not linked to any CU yet.
291 EntryCU = getCUDie();
292 Die->addValue(Attribute, EntryCU == DieCU ? dwarf::DW_FORM_ref4
293 : dwarf::DW_FORM_ref_addr,
297 /// Create a DIE with the given Tag, add the DIE to its parent, and
298 /// call insertDIE if MD is not null.
299 DIE *CompileUnit::createAndAddDIE(unsigned Tag, DIE &Parent, DIDescriptor N) {
300 DIE *Die = new DIE(Tag);
301 Parent.addChild(Die);
307 /// addBlock - Add block data.
309 void CompileUnit::addBlock(DIE *Die, dwarf::Attribute Attribute,
311 Block->ComputeSize(Asm);
312 DIEBlocks.push_back(Block); // Memoize so we can call the destructor later on.
313 Die->addValue(Attribute, Block->BestForm(), Block);
316 /// addSourceLine - Add location information to specified debug information
318 void CompileUnit::addSourceLine(DIE *Die, DIVariable V) {
323 unsigned Line = V.getLineNumber();
327 DD->getOrCreateSourceID(V.getContext().getFilename(),
328 V.getContext().getDirectory(), getUniqueID());
329 assert(FileID && "Invalid file id");
330 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
331 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
334 /// addSourceLine - Add location information to specified debug information
336 void CompileUnit::addSourceLine(DIE *Die, DIGlobalVariable G) {
337 // Verify global variable.
338 if (!G.isGlobalVariable())
341 unsigned Line = G.getLineNumber();
345 DD->getOrCreateSourceID(G.getFilename(), G.getDirectory(), getUniqueID());
346 assert(FileID && "Invalid file id");
347 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
348 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
351 /// addSourceLine - Add location information to specified debug information
353 void CompileUnit::addSourceLine(DIE *Die, DISubprogram SP) {
354 // Verify subprogram.
355 if (!SP.isSubprogram())
358 // If the line number is 0, don't add it.
359 unsigned Line = SP.getLineNumber();
363 unsigned FileID = DD->getOrCreateSourceID(SP.getFilename(), SP.getDirectory(),
365 assert(FileID && "Invalid file id");
366 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
367 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
370 /// addSourceLine - Add location information to specified debug information
372 void CompileUnit::addSourceLine(DIE *Die, DIType Ty) {
377 unsigned Line = Ty.getLineNumber();
380 unsigned FileID = DD->getOrCreateSourceID(Ty.getFilename(), Ty.getDirectory(),
382 assert(FileID && "Invalid file id");
383 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
384 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
387 /// addSourceLine - Add location information to specified debug information
389 void CompileUnit::addSourceLine(DIE *Die, DIObjCProperty Ty) {
391 if (!Ty.isObjCProperty())
394 unsigned Line = Ty.getLineNumber();
397 DIFile File = Ty.getFile();
398 unsigned FileID = DD->getOrCreateSourceID(File.getFilename(),
399 File.getDirectory(), getUniqueID());
400 assert(FileID && "Invalid file id");
401 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
402 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
405 /// addSourceLine - Add location information to specified debug information
407 void CompileUnit::addSourceLine(DIE *Die, DINameSpace NS) {
412 unsigned Line = NS.getLineNumber();
415 StringRef FN = NS.getFilename();
418 DD->getOrCreateSourceID(FN, NS.getDirectory(), getUniqueID());
419 assert(FileID && "Invalid file id");
420 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
421 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
424 /// addVariableAddress - Add DW_AT_location attribute for a
425 /// DbgVariable based on provided MachineLocation.
426 void CompileUnit::addVariableAddress(const DbgVariable &DV, DIE *Die,
427 MachineLocation Location) {
428 if (DV.variableHasComplexAddress())
429 addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
430 else if (DV.isBlockByrefVariable())
431 addBlockByrefAddress(DV, Die, dwarf::DW_AT_location, Location);
433 addAddress(Die, dwarf::DW_AT_location, Location,
434 DV.getVariable().isIndirect());
437 /// addRegisterOp - Add register operand.
438 void CompileUnit::addRegisterOp(DIEBlock *TheDie, unsigned Reg) {
439 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
440 unsigned DWReg = RI->getDwarfRegNum(Reg, false);
442 addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + DWReg);
444 addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_regx);
445 addUInt(TheDie, dwarf::DW_FORM_udata, DWReg);
449 /// addRegisterOffset - Add register offset.
450 void CompileUnit::addRegisterOffset(DIEBlock *TheDie, unsigned Reg,
452 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
453 unsigned DWReg = RI->getDwarfRegNum(Reg, false);
454 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
455 if (Reg == TRI->getFrameRegister(*Asm->MF))
456 // If variable offset is based in frame register then use fbreg.
457 addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_fbreg);
459 addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + DWReg);
461 addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
462 addUInt(TheDie, dwarf::DW_FORM_udata, DWReg);
464 addSInt(TheDie, dwarf::DW_FORM_sdata, Offset);
467 /// addAddress - Add an address attribute to a die based on the location
469 void CompileUnit::addAddress(DIE *Die, dwarf::Attribute Attribute,
470 const MachineLocation &Location, bool Indirect) {
471 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
473 if (Location.isReg() && !Indirect)
474 addRegisterOp(Block, Location.getReg());
476 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
477 if (Indirect && !Location.isReg()) {
478 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
482 // Now attach the location information to the DIE.
483 addBlock(Die, Attribute, Block);
486 /// addComplexAddress - Start with the address based on the location provided,
487 /// and generate the DWARF information necessary to find the actual variable
488 /// given the extra address information encoded in the DIVariable, starting from
489 /// the starting location. Add the DWARF information to the die.
491 void CompileUnit::addComplexAddress(const DbgVariable &DV, DIE *Die,
492 dwarf::Attribute Attribute,
493 const MachineLocation &Location) {
494 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
495 unsigned N = DV.getNumAddrElements();
497 if (Location.isReg()) {
498 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
499 // If first address element is OpPlus then emit
500 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
501 addRegisterOffset(Block, Location.getReg(), DV.getAddrElement(1));
504 addRegisterOp(Block, Location.getReg());
506 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
509 uint64_t Element = DV.getAddrElement(i);
510 if (Element == DIBuilder::OpPlus) {
511 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
512 addUInt(Block, dwarf::DW_FORM_udata, DV.getAddrElement(++i));
513 } else if (Element == DIBuilder::OpDeref) {
514 if (!Location.isReg())
515 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
517 llvm_unreachable("unknown DIBuilder Opcode");
520 // Now attach the location information to the DIE.
521 addBlock(Die, Attribute, Block);
524 /* Byref variables, in Blocks, are declared by the programmer as "SomeType
525 VarName;", but the compiler creates a __Block_byref_x_VarName struct, and
526 gives the variable VarName either the struct, or a pointer to the struct, as
527 its type. This is necessary for various behind-the-scenes things the
528 compiler needs to do with by-reference variables in Blocks.
530 However, as far as the original *programmer* is concerned, the variable
531 should still have type 'SomeType', as originally declared.
533 The function getBlockByrefType dives into the __Block_byref_x_VarName
534 struct to find the original type of the variable, which is then assigned to
535 the variable's Debug Information Entry as its real type. So far, so good.
536 However now the debugger will expect the variable VarName to have the type
537 SomeType. So we need the location attribute for the variable to be an
538 expression that explains to the debugger how to navigate through the
539 pointers and struct to find the actual variable of type SomeType.
541 The following function does just that. We start by getting
542 the "normal" location for the variable. This will be the location
543 of either the struct __Block_byref_x_VarName or the pointer to the
544 struct __Block_byref_x_VarName.
546 The struct will look something like:
548 struct __Block_byref_x_VarName {
550 struct __Block_byref_x_VarName *forwarding;
551 ... <various other fields>
553 ... <maybe more fields>
556 If we are given the struct directly (as our starting point) we
557 need to tell the debugger to:
559 1). Add the offset of the forwarding field.
561 2). Follow that pointer to get the real __Block_byref_x_VarName
562 struct to use (the real one may have been copied onto the heap).
564 3). Add the offset for the field VarName, to find the actual variable.
566 If we started with a pointer to the struct, then we need to
567 dereference that pointer first, before the other steps.
568 Translating this into DWARF ops, we will need to append the following
569 to the current location description for the variable:
571 DW_OP_deref -- optional, if we start with a pointer
572 DW_OP_plus_uconst <forward_fld_offset>
574 DW_OP_plus_uconst <varName_fld_offset>
576 That is what this function does. */
578 /// addBlockByrefAddress - Start with the address based on the location
579 /// provided, and generate the DWARF information necessary to find the
580 /// actual Block variable (navigating the Block struct) based on the
581 /// starting location. Add the DWARF information to the die. For
582 /// more information, read large comment just above here.
584 void CompileUnit::addBlockByrefAddress(const DbgVariable &DV, DIE *Die,
585 dwarf::Attribute Attribute,
586 const MachineLocation &Location) {
587 DIType Ty = DV.getType();
589 uint16_t Tag = Ty.getTag();
590 bool isPointer = false;
592 StringRef varName = DV.getName();
594 if (Tag == dwarf::DW_TAG_pointer_type) {
595 DIDerivedType DTy(Ty);
596 TmpTy = resolve(DTy.getTypeDerivedFrom());
600 DICompositeType blockStruct(TmpTy);
602 // Find the __forwarding field and the variable field in the __Block_byref
604 DIArray Fields = blockStruct.getTypeArray();
605 DIDerivedType varField;
606 DIDerivedType forwardingField;
608 for (unsigned i = 0, N = Fields.getNumElements(); i < N; ++i) {
609 DIDerivedType DT(Fields.getElement(i));
610 StringRef fieldName = DT.getName();
611 if (fieldName == "__forwarding")
612 forwardingField = DT;
613 else if (fieldName == varName)
617 // Get the offsets for the forwarding field and the variable field.
618 unsigned forwardingFieldOffset = forwardingField.getOffsetInBits() >> 3;
619 unsigned varFieldOffset = varField.getOffsetInBits() >> 2;
621 // Decode the original location, and use that as the start of the byref
622 // variable's location.
623 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
625 if (Location.isReg())
626 addRegisterOp(Block, Location.getReg());
628 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
630 // If we started with a pointer to the __Block_byref... struct, then
631 // the first thing we need to do is dereference the pointer (DW_OP_deref).
633 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
635 // Next add the offset for the '__forwarding' field:
636 // DW_OP_plus_uconst ForwardingFieldOffset. Note there's no point in
637 // adding the offset if it's 0.
638 if (forwardingFieldOffset > 0) {
639 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
640 addUInt(Block, dwarf::DW_FORM_udata, forwardingFieldOffset);
643 // Now dereference the __forwarding field to get to the real __Block_byref
644 // struct: DW_OP_deref.
645 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
647 // Now that we've got the real __Block_byref... struct, add the offset
648 // for the variable's field to get to the location of the actual variable:
649 // DW_OP_plus_uconst varFieldOffset. Again, don't add if it's 0.
650 if (varFieldOffset > 0) {
651 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
652 addUInt(Block, dwarf::DW_FORM_udata, varFieldOffset);
655 // Now attach the location information to the DIE.
656 addBlock(Die, Attribute, Block);
659 /// isTypeSigned - Return true if the type is signed.
660 static bool isTypeSigned(DwarfDebug *DD, DIType Ty, int *SizeInBits) {
661 if (Ty.isDerivedType())
662 return isTypeSigned(DD, DD->resolve(DIDerivedType(Ty).getTypeDerivedFrom()),
664 if (Ty.isBasicType())
665 if (DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed ||
666 DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed_char) {
667 *SizeInBits = Ty.getSizeInBits();
673 /// Return true if type encoding is unsigned.
674 static bool isUnsignedDIType(DwarfDebug *DD, DIType Ty) {
675 DIDerivedType DTy(Ty);
676 if (DTy.isDerivedType())
677 return isUnsignedDIType(DD, DD->resolve(DTy.getTypeDerivedFrom()));
680 if (BTy.isBasicType()) {
681 unsigned Encoding = BTy.getEncoding();
682 if (Encoding == dwarf::DW_ATE_unsigned ||
683 Encoding == dwarf::DW_ATE_unsigned_char ||
684 Encoding == dwarf::DW_ATE_boolean)
690 /// If this type is derived from a base type then return base type size.
691 static uint64_t getBaseTypeSize(DwarfDebug *DD, DIDerivedType Ty) {
692 unsigned Tag = Ty.getTag();
694 if (Tag != dwarf::DW_TAG_member && Tag != dwarf::DW_TAG_typedef &&
695 Tag != dwarf::DW_TAG_const_type && Tag != dwarf::DW_TAG_volatile_type &&
696 Tag != dwarf::DW_TAG_restrict_type)
697 return Ty.getSizeInBits();
699 DIType BaseType = DD->resolve(Ty.getTypeDerivedFrom());
701 // If this type is not derived from any type then take conservative approach.
702 if (!BaseType.isValid())
703 return Ty.getSizeInBits();
705 // If this is a derived type, go ahead and get the base type, unless it's a
706 // reference then it's just the size of the field. Pointer types have no need
707 // of this since they're a different type of qualification on the type.
708 if (BaseType.getTag() == dwarf::DW_TAG_reference_type ||
709 BaseType.getTag() == dwarf::DW_TAG_rvalue_reference_type)
710 return Ty.getSizeInBits();
712 if (BaseType.isDerivedType())
713 return getBaseTypeSize(DD, DIDerivedType(BaseType));
715 return BaseType.getSizeInBits();
718 /// addConstantValue - Add constant value entry in variable DIE.
719 void CompileUnit::addConstantValue(DIE *Die, const MachineOperand &MO,
721 // FIXME: This is a bit conservative/simple - it emits negative values at
722 // their maximum bit width which is a bit unfortunate (& doesn't prefer
723 // udata/sdata over dataN as suggested by the DWARF spec)
724 assert(MO.isImm() && "Invalid machine operand!");
726 bool SignedConstant = isTypeSigned(DD, Ty, &SizeInBits);
729 // If we're a signed constant definitely use sdata.
730 if (SignedConstant) {
731 addSInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, MO.getImm());
735 // Else use data for now unless it's larger than we can deal with.
736 switch (SizeInBits) {
738 Form = dwarf::DW_FORM_data1;
741 Form = dwarf::DW_FORM_data2;
744 Form = dwarf::DW_FORM_data4;
747 Form = dwarf::DW_FORM_data8;
750 Form = dwarf::DW_FORM_udata;
751 addUInt(Die, dwarf::DW_AT_const_value, Form, MO.getImm());
754 addUInt(Die, dwarf::DW_AT_const_value, Form, MO.getImm());
757 /// addConstantFPValue - Add constant value entry in variable DIE.
758 void CompileUnit::addConstantFPValue(DIE *Die, const MachineOperand &MO) {
759 assert(MO.isFPImm() && "Invalid machine operand!");
760 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
761 APFloat FPImm = MO.getFPImm()->getValueAPF();
763 // Get the raw data form of the floating point.
764 const APInt FltVal = FPImm.bitcastToAPInt();
765 const char *FltPtr = (const char *)FltVal.getRawData();
767 int NumBytes = FltVal.getBitWidth() / 8; // 8 bits per byte.
768 bool LittleEndian = Asm->getDataLayout().isLittleEndian();
769 int Incr = (LittleEndian ? 1 : -1);
770 int Start = (LittleEndian ? 0 : NumBytes - 1);
771 int Stop = (LittleEndian ? NumBytes : -1);
773 // Output the constant to DWARF one byte at a time.
774 for (; Start != Stop; Start += Incr)
775 addUInt(Block, dwarf::DW_FORM_data1, (unsigned char)0xFF & FltPtr[Start]);
777 addBlock(Die, dwarf::DW_AT_const_value, Block);
780 /// addConstantFPValue - Add constant value entry in variable DIE.
781 void CompileUnit::addConstantFPValue(DIE *Die, const ConstantFP *CFP) {
782 // Pass this down to addConstantValue as an unsigned bag of bits.
783 addConstantValue(Die, CFP->getValueAPF().bitcastToAPInt(), true);
786 /// addConstantValue - Add constant value entry in variable DIE.
787 void CompileUnit::addConstantValue(DIE *Die, const ConstantInt *CI,
789 addConstantValue(Die, CI->getValue(), Unsigned);
792 // addConstantValue - Add constant value entry in variable DIE.
793 void CompileUnit::addConstantValue(DIE *Die, const APInt &Val, bool Unsigned) {
794 unsigned CIBitWidth = Val.getBitWidth();
795 if (CIBitWidth <= 64) {
796 // If we're a signed constant definitely use sdata.
798 addSInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata,
803 // Else use data for now unless it's larger than we can deal with.
805 switch (CIBitWidth) {
807 Form = dwarf::DW_FORM_data1;
810 Form = dwarf::DW_FORM_data2;
813 Form = dwarf::DW_FORM_data4;
816 Form = dwarf::DW_FORM_data8;
819 addUInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_udata,
823 addUInt(Die, dwarf::DW_AT_const_value, Form, Val.getZExtValue());
827 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
829 // Get the raw data form of the large APInt.
830 const uint64_t *Ptr64 = Val.getRawData();
832 int NumBytes = Val.getBitWidth() / 8; // 8 bits per byte.
833 bool LittleEndian = Asm->getDataLayout().isLittleEndian();
835 // Output the constant to DWARF one byte at a time.
836 for (int i = 0; i < NumBytes; i++) {
839 c = Ptr64[i / 8] >> (8 * (i & 7));
841 c = Ptr64[(NumBytes - 1 - i) / 8] >> (8 * ((NumBytes - 1 - i) & 7));
842 addUInt(Block, dwarf::DW_FORM_data1, c);
845 addBlock(Die, dwarf::DW_AT_const_value, Block);
848 /// addTemplateParams - Add template parameters into buffer.
849 void CompileUnit::addTemplateParams(DIE &Buffer, DIArray TParams) {
850 // Add template parameters.
851 for (unsigned i = 0, e = TParams.getNumElements(); i != e; ++i) {
852 DIDescriptor Element = TParams.getElement(i);
853 if (Element.isTemplateTypeParameter())
854 constructTemplateTypeParameterDIE(Buffer,
855 DITemplateTypeParameter(Element));
856 else if (Element.isTemplateValueParameter())
857 constructTemplateValueParameterDIE(Buffer,
858 DITemplateValueParameter(Element));
862 /// getOrCreateContextDIE - Get context owner's DIE.
863 DIE *CompileUnit::getOrCreateContextDIE(DIScope Context) {
864 if (!Context || Context.isFile())
866 if (Context.isType())
867 return getOrCreateTypeDIE(DIType(Context));
868 if (Context.isNameSpace())
869 return getOrCreateNameSpace(DINameSpace(Context));
870 if (Context.isSubprogram())
871 return getOrCreateSubprogramDIE(DISubprogram(Context));
872 return getDIE(Context);
875 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
877 DIE *CompileUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
884 // Construct the context before querying for the existence of the DIE in case
885 // such construction creates the DIE.
886 DIE *ContextDIE = getOrCreateContextDIE(resolve(Ty.getContext()));
889 DIE *TyDIE = getDIE(Ty);
894 TyDIE = createAndAddDIE(Ty.getTag(), *ContextDIE, Ty);
896 if (Ty.isBasicType())
897 constructTypeDIE(*TyDIE, DIBasicType(Ty));
898 else if (Ty.isCompositeType())
899 constructTypeDIE(*TyDIE, DICompositeType(Ty));
901 assert(Ty.isDerivedType() && "Unknown kind of DIType");
902 constructTypeDIE(*TyDIE, DIDerivedType(Ty));
904 // If this is a named finished type then include it in the list of types
905 // for the accelerator tables.
906 if (!Ty.getName().empty() && !Ty.isForwardDecl()) {
907 bool IsImplementation = 0;
908 if (Ty.isCompositeType()) {
909 DICompositeType CT(Ty);
910 // A runtime language of 0 actually means C/C++ and that any
911 // non-negative value is some version of Objective-C/C++.
912 IsImplementation = (CT.getRunTimeLang() == 0) || CT.isObjcClassComplete();
914 unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0;
915 addAccelType(Ty.getName(), std::make_pair(TyDIE, Flags));
921 /// addType - Add a new type attribute to the specified entity.
922 void CompileUnit::addType(DIE *Entity, DIType Ty, dwarf::Attribute Attribute) {
923 assert(Ty && "Trying to add a type that doesn't exist?");
925 // Check for pre-existence.
926 DIEEntry *Entry = getDIEEntry(Ty);
927 // If it exists then use the existing value.
929 addDIEEntry(Entity, Attribute, Entry);
934 DIE *Buffer = getOrCreateTypeDIE(Ty);
937 Entry = createDIEEntry(Buffer);
938 insertDIEEntry(Ty, Entry);
939 addDIEEntry(Entity, Attribute, Entry);
941 // If this is a complete composite type then include it in the
942 // list of global types.
946 // Accelerator table mutators - add each name along with its companion
947 // DIE to the proper table while ensuring that the name that we're going
948 // to reference is in the string table. We do this since the names we
949 // add may not only be identical to the names in the DIE.
950 void CompileUnit::addAccelName(StringRef Name, DIE *Die) {
951 DU->getStringPoolEntry(Name);
952 std::vector<DIE *> &DIEs = AccelNames[Name];
956 void CompileUnit::addAccelObjC(StringRef Name, DIE *Die) {
957 DU->getStringPoolEntry(Name);
958 std::vector<DIE *> &DIEs = AccelObjC[Name];
962 void CompileUnit::addAccelNamespace(StringRef Name, DIE *Die) {
963 DU->getStringPoolEntry(Name);
964 std::vector<DIE *> &DIEs = AccelNamespace[Name];
968 void CompileUnit::addAccelType(StringRef Name, std::pair<DIE *, unsigned> Die) {
969 DU->getStringPoolEntry(Name);
970 std::vector<std::pair<DIE *, unsigned> > &DIEs = AccelTypes[Name];
974 /// addGlobalName - Add a new global name to the compile unit.
975 void CompileUnit::addGlobalName(StringRef Name, DIE *Die, DIScope Context) {
976 std::string FullName = getParentContextString(Context) + Name.str();
977 GlobalNames[FullName] = Die;
980 /// addGlobalType - Add a new global type to the compile unit.
982 void CompileUnit::addGlobalType(DIType Ty) {
983 DIScope Context = resolve(Ty.getContext());
984 if (!Ty.getName().empty() && !Ty.isForwardDecl() &&
985 (!Context || Context.isCompileUnit() || Context.isFile() ||
986 Context.isNameSpace()))
987 if (DIEEntry *Entry = getDIEEntry(Ty)) {
988 std::string FullName =
989 getParentContextString(Context) + Ty.getName().str();
990 GlobalTypes[FullName] = Entry->getEntry();
994 /// getParentContextString - Walks the metadata parent chain in a language
995 /// specific manner (using the compile unit language) and returns
996 /// it as a string. This is done at the metadata level because DIEs may
997 /// not currently have been added to the parent context and walking the
998 /// DIEs looking for names is more expensive than walking the metadata.
999 std::string CompileUnit::getParentContextString(DIScope Context) const {
1003 // FIXME: Decide whether to implement this for non-C++ languages.
1004 if (getLanguage() != dwarf::DW_LANG_C_plus_plus)
1008 SmallVector<DIScope, 1> Parents;
1009 while (!Context.isCompileUnit()) {
1010 Parents.push_back(Context);
1011 if (Context.getContext())
1012 Context = resolve(Context.getContext());
1014 // Structure, etc types will have a NULL context if they're at the top
1019 // Reverse iterate over our list to go from the outermost construct to the
1021 for (SmallVectorImpl<DIScope>::reverse_iterator I = Parents.rbegin(),
1025 StringRef Name = Ctx.getName();
1026 if (!Name.empty()) {
1034 /// addPubTypes - Add subprogram argument types for pubtypes section.
1035 void CompileUnit::addPubTypes(DISubprogram SP) {
1036 DICompositeType SPTy = SP.getType();
1037 uint16_t SPTag = SPTy.getTag();
1038 if (SPTag != dwarf::DW_TAG_subroutine_type)
1041 DIArray Args = SPTy.getTypeArray();
1042 for (unsigned i = 0, e = Args.getNumElements(); i != e; ++i) {
1043 DIType ATy(Args.getElement(i));
1050 /// constructTypeDIE - Construct basic type die from DIBasicType.
1051 void CompileUnit::constructTypeDIE(DIE &Buffer, DIBasicType BTy) {
1052 // Get core information.
1053 StringRef Name = BTy.getName();
1054 // Add name if not anonymous or intermediate type.
1056 addString(&Buffer, dwarf::DW_AT_name, Name);
1058 // An unspecified type only has a name attribute.
1059 if (BTy.getTag() == dwarf::DW_TAG_unspecified_type)
1062 addUInt(&Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1065 uint64_t Size = BTy.getSizeInBits() >> 3;
1066 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1069 /// constructTypeDIE - Construct derived type die from DIDerivedType.
1070 void CompileUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
1071 // Get core information.
1072 StringRef Name = DTy.getName();
1073 uint64_t Size = DTy.getSizeInBits() >> 3;
1074 uint16_t Tag = Buffer.getTag();
1076 // Map to main type, void will not have a type.
1077 DIType FromTy = resolve(DTy.getTypeDerivedFrom());
1079 addType(&Buffer, FromTy);
1081 // Add name if not anonymous or intermediate type.
1083 addString(&Buffer, dwarf::DW_AT_name, Name);
1085 // Add size if non-zero (derived types might be zero-sized.)
1086 if (Size && Tag != dwarf::DW_TAG_pointer_type)
1087 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1089 if (Tag == dwarf::DW_TAG_ptr_to_member_type)
1090 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
1091 getOrCreateTypeDIE(resolve(DTy.getClassType())));
1092 // Add source line info if available and TyDesc is not a forward declaration.
1093 if (!DTy.isForwardDecl())
1094 addSourceLine(&Buffer, DTy);
1097 /// Return true if the type is appropriately scoped to be contained inside
1098 /// its own type unit.
1099 static bool isTypeUnitScoped(DIType Ty, const DwarfDebug *DD) {
1100 DIScope Parent = DD->resolve(Ty.getContext());
1102 // Don't generate a hash for anything scoped inside a function.
1103 if (Parent.isSubprogram())
1105 Parent = DD->resolve(Parent.getContext());
1110 /// Return true if the type should be split out into a type unit.
1111 static bool shouldCreateTypeUnit(DICompositeType CTy, const DwarfDebug *DD) {
1112 uint16_t Tag = CTy.getTag();
1115 case dwarf::DW_TAG_structure_type:
1116 case dwarf::DW_TAG_union_type:
1117 case dwarf::DW_TAG_enumeration_type:
1118 case dwarf::DW_TAG_class_type:
1119 // If this is a class, structure, union, or enumeration type
1120 // that is a definition (not a declaration), and not scoped
1121 // inside a function then separate this out as a type unit.
1122 return !CTy.isForwardDecl() && isTypeUnitScoped(CTy, DD);
1128 /// constructTypeDIE - Construct type DIE from DICompositeType.
1129 void CompileUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
1130 // Get core information.
1131 StringRef Name = CTy.getName();
1133 uint64_t Size = CTy.getSizeInBits() >> 3;
1134 uint16_t Tag = Buffer.getTag();
1137 case dwarf::DW_TAG_array_type:
1138 constructArrayTypeDIE(Buffer, CTy);
1140 case dwarf::DW_TAG_enumeration_type:
1141 constructEnumTypeDIE(Buffer, CTy);
1143 case dwarf::DW_TAG_subroutine_type: {
1144 // Add return type. A void return won't have a type.
1145 DIArray Elements = CTy.getTypeArray();
1146 DIType RTy(Elements.getElement(0));
1148 addType(&Buffer, RTy);
1150 bool isPrototyped = true;
1152 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
1153 DIDescriptor Ty = Elements.getElement(i);
1154 if (Ty.isUnspecifiedParameter()) {
1155 createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
1156 isPrototyped = false;
1158 DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
1159 addType(Arg, DIType(Ty));
1160 if (DIType(Ty).isArtificial())
1161 addFlag(Arg, dwarf::DW_AT_artificial);
1164 // Add prototype flag if we're dealing with a C language and the
1165 // function has been prototyped.
1166 uint16_t Language = getLanguage();
1168 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1169 Language == dwarf::DW_LANG_ObjC))
1170 addFlag(&Buffer, dwarf::DW_AT_prototyped);
1172 case dwarf::DW_TAG_structure_type:
1173 case dwarf::DW_TAG_union_type:
1174 case dwarf::DW_TAG_class_type: {
1175 // Add elements to structure type.
1176 DIArray Elements = CTy.getTypeArray();
1177 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1178 DIDescriptor Element = Elements.getElement(i);
1179 DIE *ElemDie = NULL;
1180 if (Element.isSubprogram()) {
1181 DISubprogram SP(Element);
1182 ElemDie = getOrCreateSubprogramDIE(SP);
1183 if (SP.isProtected())
1184 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1185 dwarf::DW_ACCESS_protected);
1186 else if (SP.isPrivate())
1187 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1188 dwarf::DW_ACCESS_private);
1190 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1191 dwarf::DW_ACCESS_public);
1192 if (SP.isExplicit())
1193 addFlag(ElemDie, dwarf::DW_AT_explicit);
1194 } else if (Element.isDerivedType()) {
1195 DIDerivedType DDTy(Element);
1196 if (DDTy.getTag() == dwarf::DW_TAG_friend) {
1197 ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
1198 addType(ElemDie, resolve(DDTy.getTypeDerivedFrom()),
1199 dwarf::DW_AT_friend);
1200 } else if (DDTy.isStaticMember()) {
1201 getOrCreateStaticMemberDIE(DDTy);
1203 constructMemberDIE(Buffer, DDTy);
1205 } else if (Element.isObjCProperty()) {
1206 DIObjCProperty Property(Element);
1207 ElemDie = createAndAddDIE(Property.getTag(), Buffer);
1208 StringRef PropertyName = Property.getObjCPropertyName();
1209 addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
1210 addType(ElemDie, Property.getType());
1211 addSourceLine(ElemDie, Property);
1212 StringRef GetterName = Property.getObjCPropertyGetterName();
1213 if (!GetterName.empty())
1214 addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
1215 StringRef SetterName = Property.getObjCPropertySetterName();
1216 if (!SetterName.empty())
1217 addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
1218 unsigned PropertyAttributes = 0;
1219 if (Property.isReadOnlyObjCProperty())
1220 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readonly;
1221 if (Property.isReadWriteObjCProperty())
1222 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readwrite;
1223 if (Property.isAssignObjCProperty())
1224 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_assign;
1225 if (Property.isRetainObjCProperty())
1226 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_retain;
1227 if (Property.isCopyObjCProperty())
1228 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_copy;
1229 if (Property.isNonAtomicObjCProperty())
1230 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_nonatomic;
1231 if (PropertyAttributes)
1232 addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, None,
1233 PropertyAttributes);
1235 DIEEntry *Entry = getDIEEntry(Element);
1237 Entry = createDIEEntry(ElemDie);
1238 insertDIEEntry(Element, Entry);
1244 if (CTy.isAppleBlockExtension())
1245 addFlag(&Buffer, dwarf::DW_AT_APPLE_block);
1247 DICompositeType ContainingType(resolve(CTy.getContainingType()));
1249 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
1250 getOrCreateTypeDIE(ContainingType));
1252 if (CTy.isObjcClassComplete())
1253 addFlag(&Buffer, dwarf::DW_AT_APPLE_objc_complete_type);
1255 // Add template parameters to a class, structure or union types.
1256 // FIXME: The support isn't in the metadata for this yet.
1257 if (Tag == dwarf::DW_TAG_class_type ||
1258 Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type)
1259 addTemplateParams(Buffer, CTy.getTemplateParams());
1267 // Add name if not anonymous or intermediate type.
1269 addString(&Buffer, dwarf::DW_AT_name, Name);
1271 if (Tag == dwarf::DW_TAG_enumeration_type ||
1272 Tag == dwarf::DW_TAG_class_type || Tag == dwarf::DW_TAG_structure_type ||
1273 Tag == dwarf::DW_TAG_union_type) {
1274 // Add size if non-zero (derived types might be zero-sized.)
1275 // TODO: Do we care about size for enum forward declarations?
1277 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1278 else if (!CTy.isForwardDecl())
1279 // Add zero size if it is not a forward declaration.
1280 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, 0);
1282 // If we're a forward decl, say so.
1283 if (CTy.isForwardDecl())
1284 addFlag(&Buffer, dwarf::DW_AT_declaration);
1286 // Add source line info if available.
1287 if (!CTy.isForwardDecl())
1288 addSourceLine(&Buffer, CTy);
1290 // No harm in adding the runtime language to the declaration.
1291 unsigned RLang = CTy.getRunTimeLang();
1293 addUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class, dwarf::DW_FORM_data1,
1296 // If this is a type applicable to a type unit it then add it to the
1297 // list of types we'll compute a hash for later.
1298 if (shouldCreateTypeUnit(CTy, DD))
1299 DD->addTypeUnitType(&Buffer);
1302 /// constructTemplateTypeParameterDIE - Construct new DIE for the given
1303 /// DITemplateTypeParameter.
1305 CompileUnit::constructTemplateTypeParameterDIE(DIE &Buffer,
1306 DITemplateTypeParameter TP) {
1308 createAndAddDIE(dwarf::DW_TAG_template_type_parameter, Buffer);
1309 // Add the type if it exists, it could be void and therefore no type.
1311 addType(ParamDIE, resolve(TP.getType()));
1312 if (!TP.getName().empty())
1313 addString(ParamDIE, dwarf::DW_AT_name, TP.getName());
1316 /// constructTemplateValueParameterDIE - Construct new DIE for the given
1317 /// DITemplateValueParameter.
1319 CompileUnit::constructTemplateValueParameterDIE(DIE &Buffer,
1320 DITemplateValueParameter VP) {
1321 DIE *ParamDIE = createAndAddDIE(VP.getTag(), Buffer);
1323 // Add the type if there is one, template template and template parameter
1324 // packs will not have a type.
1325 if (VP.getTag() == dwarf::DW_TAG_template_value_parameter)
1326 addType(ParamDIE, resolve(VP.getType()));
1327 if (!VP.getName().empty())
1328 addString(ParamDIE, dwarf::DW_AT_name, VP.getName());
1329 if (Value *Val = VP.getValue()) {
1330 if (ConstantInt *CI = dyn_cast<ConstantInt>(Val))
1331 addConstantValue(ParamDIE, CI,
1332 isUnsignedDIType(DD, resolve(VP.getType())));
1333 else if (GlobalValue *GV = dyn_cast<GlobalValue>(Val)) {
1334 // For declaration non-type template parameters (such as global values and
1336 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1337 addOpAddress(Block, Asm->getSymbol(GV));
1338 // Emit DW_OP_stack_value to use the address as the immediate value of the
1339 // parameter, rather than a pointer to it.
1340 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
1341 addBlock(ParamDIE, dwarf::DW_AT_location, Block);
1342 } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_template_param) {
1343 assert(isa<MDString>(Val));
1344 addString(ParamDIE, dwarf::DW_AT_GNU_template_name,
1345 cast<MDString>(Val)->getString());
1346 } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_parameter_pack) {
1347 assert(isa<MDNode>(Val));
1348 DIArray A(cast<MDNode>(Val));
1349 addTemplateParams(*ParamDIE, A);
1354 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
1355 DIE *CompileUnit::getOrCreateNameSpace(DINameSpace NS) {
1356 // Construct the context before querying for the existence of the DIE in case
1357 // such construction creates the DIE.
1358 DIE *ContextDIE = getOrCreateContextDIE(NS.getContext());
1360 DIE *NDie = getDIE(NS);
1363 NDie = createAndAddDIE(dwarf::DW_TAG_namespace, *ContextDIE, NS);
1365 if (!NS.getName().empty()) {
1366 addString(NDie, dwarf::DW_AT_name, NS.getName());
1367 addAccelNamespace(NS.getName(), NDie);
1368 addGlobalName(NS.getName(), NDie, NS.getContext());
1370 addAccelNamespace("(anonymous namespace)", NDie);
1371 addSourceLine(NDie, NS);
1375 /// getOrCreateSubprogramDIE - Create new DIE using SP.
1376 DIE *CompileUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
1377 // Construct the context before querying for the existence of the DIE in case
1378 // such construction creates the DIE (as is the case for member function
1380 DIE *ContextDIE = getOrCreateContextDIE(resolve(SP.getContext()));
1382 DIE *SPDie = getDIE(SP);
1386 DISubprogram SPDecl = SP.getFunctionDeclaration();
1387 if (SPDecl.isSubprogram())
1388 // Add subprogram definitions to the CU die directly.
1389 ContextDIE = CUDie.get();
1391 // DW_TAG_inlined_subroutine may refer to this DIE.
1392 SPDie = createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, SP);
1394 DIE *DeclDie = NULL;
1395 if (SPDecl.isSubprogram())
1396 DeclDie = getOrCreateSubprogramDIE(SPDecl);
1398 // Add function template parameters.
1399 addTemplateParams(*SPDie, SP.getTemplateParams());
1401 // If this DIE is going to refer declaration info using AT_specification
1402 // then there is no need to add other attributes.
1404 // Refer function declaration directly.
1405 addDIEEntry(SPDie, dwarf::DW_AT_specification, DeclDie);
1410 // Add the linkage name if we have one.
1411 StringRef LinkageName = SP.getLinkageName();
1412 if (!LinkageName.empty())
1413 addString(SPDie, dwarf::DW_AT_MIPS_linkage_name,
1414 GlobalValue::getRealLinkageName(LinkageName));
1416 // Constructors and operators for anonymous aggregates do not have names.
1417 if (!SP.getName().empty())
1418 addString(SPDie, dwarf::DW_AT_name, SP.getName());
1420 addSourceLine(SPDie, SP);
1422 // Add the prototype if we have a prototype and we have a C like
1424 uint16_t Language = getLanguage();
1425 if (SP.isPrototyped() &&
1426 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1427 Language == dwarf::DW_LANG_ObjC))
1428 addFlag(SPDie, dwarf::DW_AT_prototyped);
1430 DICompositeType SPTy = SP.getType();
1431 assert(SPTy.getTag() == dwarf::DW_TAG_subroutine_type &&
1432 "the type of a subprogram should be a subroutine");
1434 DIArray Args = SPTy.getTypeArray();
1435 // Add a return type. If this is a type like a C/C++ void type we don't add a
1437 if (Args.getElement(0))
1438 addType(SPDie, DIType(Args.getElement(0)));
1440 unsigned VK = SP.getVirtuality();
1442 addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
1443 DIEBlock *Block = getDIEBlock();
1444 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1445 addUInt(Block, dwarf::DW_FORM_udata, SP.getVirtualIndex());
1446 addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, Block);
1447 ContainingTypeMap.insert(
1448 std::make_pair(SPDie, resolve(SP.getContainingType())));
1451 if (!SP.isDefinition()) {
1452 addFlag(SPDie, dwarf::DW_AT_declaration);
1454 // Add arguments. Do not add arguments for subprogram definition. They will
1455 // be handled while processing variables.
1456 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
1457 DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, *SPDie);
1458 DIType ATy(Args.getElement(i));
1460 if (ATy.isArtificial())
1461 addFlag(Arg, dwarf::DW_AT_artificial);
1465 if (SP.isArtificial())
1466 addFlag(SPDie, dwarf::DW_AT_artificial);
1468 if (!SP.isLocalToUnit())
1469 addFlag(SPDie, dwarf::DW_AT_external);
1471 if (SP.isOptimized())
1472 addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);
1474 if (unsigned isa = Asm->getISAEncoding()) {
1475 addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
1481 // Return const expression if value is a GEP to access merged global
1483 // i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
1484 static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
1485 const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
1486 if (!CE || CE->getNumOperands() != 3 ||
1487 CE->getOpcode() != Instruction::GetElementPtr)
1490 // First operand points to a global struct.
1491 Value *Ptr = CE->getOperand(0);
1492 if (!isa<GlobalValue>(Ptr) ||
1493 !isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
1496 // Second operand is zero.
1497 const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
1498 if (!CI || !CI->isZero())
1501 // Third operand is offset.
1502 if (!isa<ConstantInt>(CE->getOperand(2)))
1508 /// createGlobalVariableDIE - create global variable DIE.
1509 void CompileUnit::createGlobalVariableDIE(DIGlobalVariable GV) {
1511 // Check for pre-existence.
1515 if (!GV.isGlobalVariable())
1518 DIScope GVContext = GV.getContext();
1519 DIType GTy = GV.getType();
1521 // If this is a static data member definition, some attributes belong
1522 // to the declaration DIE.
1523 DIE *VariableDIE = NULL;
1524 bool IsStaticMember = false;
1525 DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration();
1526 if (SDMDecl.Verify()) {
1527 assert(SDMDecl.isStaticMember() && "Expected static member decl");
1528 // We need the declaration DIE that is in the static member's class.
1529 VariableDIE = getOrCreateStaticMemberDIE(SDMDecl);
1530 IsStaticMember = true;
1533 // If this is not a static data member definition, create the variable
1534 // DIE and add the initial set of attributes to it.
1536 // Construct the context before querying for the existence of the DIE in
1537 // case such construction creates the DIE.
1538 DIE *ContextDIE = getOrCreateContextDIE(GVContext);
1541 VariableDIE = createAndAddDIE(GV.getTag(), *ContextDIE, GV);
1543 // Add name and type.
1544 addString(VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
1545 addType(VariableDIE, GTy);
1547 // Add scoping info.
1548 if (!GV.isLocalToUnit())
1549 addFlag(VariableDIE, dwarf::DW_AT_external);
1551 // Add line number info.
1552 addSourceLine(VariableDIE, GV);
1556 bool addToAccelTable = false;
1557 DIE *VariableSpecDIE = NULL;
1558 bool isGlobalVariable = GV.getGlobal() != NULL;
1559 if (isGlobalVariable) {
1560 addToAccelTable = true;
1561 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1562 const MCSymbol *Sym = Asm->getSymbol(GV.getGlobal());
1563 if (GV.getGlobal()->isThreadLocal()) {
1564 // FIXME: Make this work with -gsplit-dwarf.
1565 unsigned PointerSize = Asm->getDataLayout().getPointerSize();
1566 assert((PointerSize == 4 || PointerSize == 8) &&
1567 "Add support for other sizes if necessary");
1568 const MCExpr *Expr =
1569 Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym);
1570 // Based on GCC's support for TLS:
1571 if (!DD->useSplitDwarf()) {
1572 // 1) Start with a constNu of the appropriate pointer size
1573 addUInt(Block, dwarf::DW_FORM_data1,
1574 PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
1575 // 2) containing the (relocated) offset of the TLS variable
1576 // within the module's TLS block.
1577 addExpr(Block, dwarf::DW_FORM_udata, Expr);
1579 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
1580 addUInt(Block, dwarf::DW_FORM_udata, DU->getAddrPoolIndex(Expr));
1582 // 3) followed by a custom OP to make the debugger do a TLS lookup.
1583 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
1585 addOpAddress(Block, Sym);
1586 // Do not create specification DIE if context is either compile unit
1588 if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
1589 !GVContext.isFile() && !DD->isSubprogramContext(GVContext)) {
1590 // Create specification DIE.
1591 VariableSpecDIE = createAndAddDIE(dwarf::DW_TAG_variable, *CUDie);
1592 addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification, VariableDIE);
1593 addBlock(VariableSpecDIE, dwarf::DW_AT_location, Block);
1594 // A static member's declaration is already flagged as such.
1595 if (!SDMDecl.Verify())
1596 addFlag(VariableDIE, dwarf::DW_AT_declaration);
1598 addBlock(VariableDIE, dwarf::DW_AT_location, Block);
1600 // Add the linkage name.
1601 StringRef LinkageName = GV.getLinkageName();
1602 if (!LinkageName.empty())
1603 // From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
1604 // TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
1606 addString(IsStaticMember && VariableSpecDIE ? VariableSpecDIE
1608 dwarf::DW_AT_MIPS_linkage_name,
1609 GlobalValue::getRealLinkageName(LinkageName));
1610 } else if (const ConstantInt *CI =
1611 dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
1612 // AT_const_value was added when the static member was created. To avoid
1613 // emitting AT_const_value multiple times, we only add AT_const_value when
1614 // it is not a static member.
1615 if (!IsStaticMember)
1616 addConstantValue(VariableDIE, CI, isUnsignedDIType(DD, GTy));
1617 } else if (const ConstantExpr *CE = getMergedGlobalExpr(GV->getOperand(11))) {
1618 addToAccelTable = true;
1619 // GV is a merged global.
1620 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1621 Value *Ptr = CE->getOperand(0);
1622 addOpAddress(Block, Asm->getSymbol(cast<GlobalValue>(Ptr)));
1623 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1624 SmallVector<Value *, 3> Idx(CE->op_begin() + 1, CE->op_end());
1625 addUInt(Block, dwarf::DW_FORM_udata,
1626 Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx));
1627 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1628 addBlock(VariableDIE, dwarf::DW_AT_location, Block);
1631 if (addToAccelTable) {
1632 DIE *AddrDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
1633 addAccelName(GV.getName(), AddrDIE);
1635 // If the linkage name is different than the name, go ahead and output
1636 // that as well into the name table.
1637 if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
1638 addAccelName(GV.getLinkageName(), AddrDIE);
1641 if (!GV.isLocalToUnit())
1642 addGlobalName(GV.getName(), VariableSpecDIE ? VariableSpecDIE : VariableDIE,
1646 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
1647 void CompileUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR,
1649 DIE *DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
1650 addDIEEntry(DW_Subrange, dwarf::DW_AT_type, IndexTy);
1652 // The LowerBound value defines the lower bounds which is typically zero for
1653 // C/C++. The Count value is the number of elements. Values are 64 bit. If
1654 // Count == -1 then the array is unbounded and we do not emit
1655 // DW_AT_lower_bound and DW_AT_upper_bound attributes. If LowerBound == 0 and
1656 // Count == 0, then the array has zero elements in which case we do not emit
1658 int64_t LowerBound = SR.getLo();
1659 int64_t DefaultLowerBound = getDefaultLowerBound();
1660 int64_t Count = SR.getCount();
1662 if (DefaultLowerBound == -1 || LowerBound != DefaultLowerBound)
1663 addUInt(DW_Subrange, dwarf::DW_AT_lower_bound, None, LowerBound);
1665 if (Count != -1 && Count != 0)
1666 // FIXME: An unbounded array should reference the expression that defines
1668 addUInt(DW_Subrange, dwarf::DW_AT_upper_bound, None,
1669 LowerBound + Count - 1);
1672 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
1673 void CompileUnit::constructArrayTypeDIE(DIE &Buffer, DICompositeType CTy) {
1675 addFlag(&Buffer, dwarf::DW_AT_GNU_vector);
1677 // Emit the element type.
1678 addType(&Buffer, resolve(CTy.getTypeDerivedFrom()));
1680 // Get an anonymous type for index type.
1681 // FIXME: This type should be passed down from the front end
1682 // as different languages may have different sizes for indexes.
1683 DIE *IdxTy = getIndexTyDie();
1685 // Construct an anonymous type for index type.
1686 IdxTy = createAndAddDIE(dwarf::DW_TAG_base_type, *CUDie.get());
1687 addString(IdxTy, dwarf::DW_AT_name, "int");
1688 addUInt(IdxTy, dwarf::DW_AT_byte_size, None, sizeof(int32_t));
1689 addUInt(IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1690 dwarf::DW_ATE_signed);
1691 setIndexTyDie(IdxTy);
1694 // Add subranges to array type.
1695 DIArray Elements = CTy.getTypeArray();
1696 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1697 DIDescriptor Element = Elements.getElement(i);
1698 if (Element.getTag() == dwarf::DW_TAG_subrange_type)
1699 constructSubrangeDIE(Buffer, DISubrange(Element), IdxTy);
1703 /// constructEnumTypeDIE - Construct an enum type DIE from DICompositeType.
1704 void CompileUnit::constructEnumTypeDIE(DIE &Buffer, DICompositeType CTy) {
1705 DIArray Elements = CTy.getTypeArray();
1707 // Add enumerators to enumeration type.
1708 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1709 DIEnumerator Enum(Elements.getElement(i));
1710 if (Enum.isEnumerator()) {
1711 DIE *Enumerator = createAndAddDIE(dwarf::DW_TAG_enumerator, Buffer);
1712 StringRef Name = Enum.getName();
1713 addString(Enumerator, dwarf::DW_AT_name, Name);
1714 int64_t Value = Enum.getEnumValue();
1715 addSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, Value);
1718 DIType DTy = resolve(CTy.getTypeDerivedFrom());
1720 addType(&Buffer, DTy);
1721 addFlag(&Buffer, dwarf::DW_AT_enum_class);
1725 /// constructContainingTypeDIEs - Construct DIEs for types that contain
1727 void CompileUnit::constructContainingTypeDIEs() {
1728 for (DenseMap<DIE *, const MDNode *>::iterator CI = ContainingTypeMap.begin(),
1729 CE = ContainingTypeMap.end();
1731 DIE *SPDie = CI->first;
1732 DIDescriptor D(CI->second);
1735 DIE *NDie = getDIE(D);
1738 addDIEEntry(SPDie, dwarf::DW_AT_containing_type, NDie);
1742 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
1743 DIE *CompileUnit::constructVariableDIE(DbgVariable &DV, bool isScopeAbstract) {
1744 StringRef Name = DV.getName();
1746 // Define variable debug information entry.
1747 DIE *VariableDie = new DIE(DV.getTag());
1748 DbgVariable *AbsVar = DV.getAbstractVariable();
1749 DIE *AbsDIE = AbsVar ? AbsVar->getDIE() : NULL;
1751 addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin, AbsDIE);
1754 addString(VariableDie, dwarf::DW_AT_name, Name);
1755 addSourceLine(VariableDie, DV.getVariable());
1756 addType(VariableDie, DV.getType());
1759 if (DV.isArtificial())
1760 addFlag(VariableDie, dwarf::DW_AT_artificial);
1762 if (isScopeAbstract) {
1763 DV.setDIE(VariableDie);
1767 // Add variable address.
1769 unsigned Offset = DV.getDotDebugLocOffset();
1770 if (Offset != ~0U) {
1771 addLabel(VariableDie, dwarf::DW_AT_location,
1772 DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
1773 : dwarf::DW_FORM_data4,
1774 Asm->GetTempSymbol("debug_loc", Offset));
1775 DV.setDIE(VariableDie);
1779 // Check if variable is described by a DBG_VALUE instruction.
1780 if (const MachineInstr *DVInsn = DV.getMInsn()) {
1781 assert(DVInsn->getNumOperands() == 3);
1782 if (DVInsn->getOperand(0).isReg()) {
1783 const MachineOperand RegOp = DVInsn->getOperand(0);
1784 // If the second operand is an immediate, this is an indirect value.
1785 if (DVInsn->getOperand(1).isImm()) {
1786 MachineLocation Location(RegOp.getReg(),
1787 DVInsn->getOperand(1).getImm());
1788 addVariableAddress(DV, VariableDie, Location);
1789 } else if (RegOp.getReg())
1790 addVariableAddress(DV, VariableDie, MachineLocation(RegOp.getReg()));
1791 } else if (DVInsn->getOperand(0).isImm())
1792 addConstantValue(VariableDie, DVInsn->getOperand(0), DV.getType());
1793 else if (DVInsn->getOperand(0).isFPImm())
1794 addConstantFPValue(VariableDie, DVInsn->getOperand(0));
1795 else if (DVInsn->getOperand(0).isCImm())
1796 addConstantValue(VariableDie, DVInsn->getOperand(0).getCImm(),
1797 isUnsignedDIType(DD, DV.getType()));
1799 DV.setDIE(VariableDie);
1802 // .. else use frame index.
1803 int FI = DV.getFrameIndex();
1805 unsigned FrameReg = 0;
1806 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
1807 int Offset = TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
1808 MachineLocation Location(FrameReg, Offset);
1809 addVariableAddress(DV, VariableDie, Location);
1813 DV.setDIE(VariableDie);
1817 /// constructMemberDIE - Construct member DIE from DIDerivedType.
1818 void CompileUnit::constructMemberDIE(DIE &Buffer, DIDerivedType DT) {
1819 DIE *MemberDie = createAndAddDIE(DT.getTag(), Buffer);
1820 StringRef Name = DT.getName();
1822 addString(MemberDie, dwarf::DW_AT_name, Name);
1824 addType(MemberDie, resolve(DT.getTypeDerivedFrom()));
1826 addSourceLine(MemberDie, DT);
1828 DIEBlock *MemLocationDie = new (DIEValueAllocator) DIEBlock();
1829 addUInt(MemLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
1831 if (DT.getTag() == dwarf::DW_TAG_inheritance && DT.isVirtual()) {
1833 // For C++, virtual base classes are not at fixed offset. Use following
1834 // expression to extract appropriate offset from vtable.
1835 // BaseAddr = ObAddr + *((*ObAddr) - Offset)
1837 DIEBlock *VBaseLocationDie = new (DIEValueAllocator) DIEBlock();
1838 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
1839 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1840 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1841 addUInt(VBaseLocationDie, dwarf::DW_FORM_udata, DT.getOffsetInBits());
1842 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
1843 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1844 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1846 addBlock(MemberDie, dwarf::DW_AT_data_member_location, VBaseLocationDie);
1848 uint64_t Size = DT.getSizeInBits();
1849 uint64_t FieldSize = getBaseTypeSize(DD, DT);
1850 uint64_t OffsetInBytes;
1852 if (Size != FieldSize) {
1854 addUInt(MemberDie, dwarf::DW_AT_byte_size, None,
1855 getBaseTypeSize(DD, DT) >> 3);
1856 addUInt(MemberDie, dwarf::DW_AT_bit_size, None, DT.getSizeInBits());
1858 uint64_t Offset = DT.getOffsetInBits();
1859 uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
1860 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1861 uint64_t FieldOffset = (HiMark - FieldSize);
1862 Offset -= FieldOffset;
1864 // Maybe we need to work from the other end.
1865 if (Asm->getDataLayout().isLittleEndian())
1866 Offset = FieldSize - (Offset + Size);
1867 addUInt(MemberDie, dwarf::DW_AT_bit_offset, None, Offset);
1869 // Here WD_AT_data_member_location points to the anonymous
1870 // field that includes this bit field.
1871 OffsetInBytes = FieldOffset >> 3;
1873 // This is not a bitfield.
1874 OffsetInBytes = DT.getOffsetInBits() >> 3;
1875 addUInt(MemberDie, dwarf::DW_AT_data_member_location, None, OffsetInBytes);
1878 if (DT.isProtected())
1879 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1880 dwarf::DW_ACCESS_protected);
1881 else if (DT.isPrivate())
1882 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1883 dwarf::DW_ACCESS_private);
1884 // Otherwise C++ member and base classes are considered public.
1886 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1887 dwarf::DW_ACCESS_public);
1889 addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1,
1890 dwarf::DW_VIRTUALITY_virtual);
1892 // Objective-C properties.
1893 if (MDNode *PNode = DT.getObjCProperty())
1894 if (DIEEntry *PropertyDie = getDIEEntry(PNode))
1895 MemberDie->addValue(dwarf::DW_AT_APPLE_property, dwarf::DW_FORM_ref4,
1898 if (DT.isArtificial())
1899 addFlag(MemberDie, dwarf::DW_AT_artificial);
1902 /// getOrCreateStaticMemberDIE - Create new DIE for C++ static member.
1903 DIE *CompileUnit::getOrCreateStaticMemberDIE(DIDerivedType DT) {
1907 // Construct the context before querying for the existence of the DIE in case
1908 // such construction creates the DIE.
1909 DIE *ContextDIE = getOrCreateContextDIE(resolve(DT.getContext()));
1910 assert(dwarf::isType(ContextDIE->getTag()) &&
1911 "Static member should belong to a type.");
1913 DIE *StaticMemberDIE = getDIE(DT);
1914 if (StaticMemberDIE)
1915 return StaticMemberDIE;
1917 StaticMemberDIE = createAndAddDIE(DT.getTag(), *ContextDIE, DT);
1919 DIType Ty = resolve(DT.getTypeDerivedFrom());
1921 addString(StaticMemberDIE, dwarf::DW_AT_name, DT.getName());
1922 addType(StaticMemberDIE, Ty);
1923 addSourceLine(StaticMemberDIE, DT);
1924 addFlag(StaticMemberDIE, dwarf::DW_AT_external);
1925 addFlag(StaticMemberDIE, dwarf::DW_AT_declaration);
1927 // FIXME: We could omit private if the parent is a class_type, and
1928 // public if the parent is something else.
1929 if (DT.isProtected())
1930 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1931 dwarf::DW_ACCESS_protected);
1932 else if (DT.isPrivate())
1933 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1934 dwarf::DW_ACCESS_private);
1936 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1937 dwarf::DW_ACCESS_public);
1939 if (const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(DT.getConstant()))
1940 addConstantValue(StaticMemberDIE, CI, isUnsignedDIType(DD, Ty));
1941 if (const ConstantFP *CFP = dyn_cast_or_null<ConstantFP>(DT.getConstant()))
1942 addConstantFPValue(StaticMemberDIE, CFP);
1944 return StaticMemberDIE;
1947 void CompileUnit::emitHeader(const MCSection *ASection,
1948 const MCSymbol *ASectionSym) {
1949 Asm->OutStreamer.AddComment("DWARF version number");
1950 Asm->EmitInt16(DD->getDwarfVersion());
1951 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
1952 Asm->EmitSectionOffset(Asm->GetTempSymbol(ASection->getLabelBeginName()),
1954 Asm->OutStreamer.AddComment("Address Size (in bytes)");
1955 Asm->EmitInt8(Asm->getDataLayout().getPointerSize());