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, const MDNode *MD) {
300 DIE *Die = new DIE(Tag);
301 Parent.addChild(Die);
303 insertDIE(DIDescriptor(MD), 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 = DIDerivedType(Ty);
596 TmpTy = resolve(DTy.getTypeDerivedFrom());
600 DICompositeType blockStruct = DICompositeType(TmpTy);
602 // Find the __forwarding field and the variable field in the __Block_byref
604 DIArray Fields = blockStruct.getTypeArray();
605 DIDescriptor varField = DIDescriptor();
606 DIDescriptor forwardingField = DIDescriptor();
608 for (unsigned i = 0, N = Fields.getNumElements(); i < N; ++i) {
609 DIDescriptor Element = Fields.getElement(i);
610 DIDerivedType DT = DIDerivedType(Element);
611 StringRef fieldName = DT.getName();
612 if (fieldName == "__forwarding")
613 forwardingField = Element;
614 else if (fieldName == varName)
618 // Get the offsets for the forwarding field and the variable field.
619 unsigned forwardingFieldOffset =
620 DIDerivedType(forwardingField).getOffsetInBits() >> 3;
621 unsigned varFieldOffset = DIDerivedType(varField).getOffsetInBits() >> 3;
623 // Decode the original location, and use that as the start of the byref
624 // variable's location.
625 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
627 if (Location.isReg())
628 addRegisterOp(Block, Location.getReg());
630 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
632 // If we started with a pointer to the __Block_byref... struct, then
633 // the first thing we need to do is dereference the pointer (DW_OP_deref).
635 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
637 // Next add the offset for the '__forwarding' field:
638 // DW_OP_plus_uconst ForwardingFieldOffset. Note there's no point in
639 // adding the offset if it's 0.
640 if (forwardingFieldOffset > 0) {
641 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
642 addUInt(Block, dwarf::DW_FORM_udata, forwardingFieldOffset);
645 // Now dereference the __forwarding field to get to the real __Block_byref
646 // struct: DW_OP_deref.
647 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
649 // Now that we've got the real __Block_byref... struct, add the offset
650 // for the variable's field to get to the location of the actual variable:
651 // DW_OP_plus_uconst varFieldOffset. Again, don't add if it's 0.
652 if (varFieldOffset > 0) {
653 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
654 addUInt(Block, dwarf::DW_FORM_udata, varFieldOffset);
657 // Now attach the location information to the DIE.
658 addBlock(Die, Attribute, Block);
661 /// isTypeSigned - Return true if the type is signed.
662 static bool isTypeSigned(DwarfDebug *DD, DIType Ty, int *SizeInBits) {
663 if (Ty.isDerivedType())
664 return isTypeSigned(DD, DD->resolve(DIDerivedType(Ty).getTypeDerivedFrom()),
666 if (Ty.isBasicType())
667 if (DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed ||
668 DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed_char) {
669 *SizeInBits = Ty.getSizeInBits();
675 /// Return true if type encoding is unsigned.
676 static bool isUnsignedDIType(DwarfDebug *DD, DIType Ty) {
677 DIDerivedType DTy(Ty);
678 if (DTy.isDerivedType())
679 return isUnsignedDIType(DD, DD->resolve(DTy.getTypeDerivedFrom()));
682 if (BTy.isBasicType()) {
683 unsigned Encoding = BTy.getEncoding();
684 if (Encoding == dwarf::DW_ATE_unsigned ||
685 Encoding == dwarf::DW_ATE_unsigned_char ||
686 Encoding == dwarf::DW_ATE_boolean)
692 /// If this type is derived from a base type then return base type size.
693 static uint64_t getBaseTypeSize(DwarfDebug *DD, DIDerivedType Ty) {
694 unsigned Tag = Ty.getTag();
696 if (Tag != dwarf::DW_TAG_member && Tag != dwarf::DW_TAG_typedef &&
697 Tag != dwarf::DW_TAG_const_type && Tag != dwarf::DW_TAG_volatile_type &&
698 Tag != dwarf::DW_TAG_restrict_type)
699 return Ty.getSizeInBits();
701 DIType BaseType = DD->resolve(Ty.getTypeDerivedFrom());
703 // If this type is not derived from any type then take conservative approach.
704 if (!BaseType.isValid())
705 return Ty.getSizeInBits();
707 // If this is a derived type, go ahead and get the base type, unless it's a
708 // reference then it's just the size of the field. Pointer types have no need
709 // of this since they're a different type of qualification on the type.
710 if (BaseType.getTag() == dwarf::DW_TAG_reference_type ||
711 BaseType.getTag() == dwarf::DW_TAG_rvalue_reference_type)
712 return Ty.getSizeInBits();
714 if (BaseType.isDerivedType())
715 return getBaseTypeSize(DD, DIDerivedType(BaseType));
717 return BaseType.getSizeInBits();
720 /// addConstantValue - Add constant value entry in variable DIE.
721 void CompileUnit::addConstantValue(DIE *Die, const MachineOperand &MO,
723 // FIXME: This is a bit conservative/simple - it emits negative values at
724 // their maximum bit width which is a bit unfortunate (& doesn't prefer
725 // udata/sdata over dataN as suggested by the DWARF spec)
726 assert(MO.isImm() && "Invalid machine operand!");
728 bool SignedConstant = isTypeSigned(DD, Ty, &SizeInBits);
731 // If we're a signed constant definitely use sdata.
732 if (SignedConstant) {
733 addSInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, MO.getImm());
737 // Else use data for now unless it's larger than we can deal with.
738 switch (SizeInBits) {
740 Form = dwarf::DW_FORM_data1;
743 Form = dwarf::DW_FORM_data2;
746 Form = dwarf::DW_FORM_data4;
749 Form = dwarf::DW_FORM_data8;
752 Form = dwarf::DW_FORM_udata;
753 addUInt(Die, dwarf::DW_AT_const_value, Form, MO.getImm());
756 addUInt(Die, dwarf::DW_AT_const_value, Form, MO.getImm());
759 /// addConstantFPValue - Add constant value entry in variable DIE.
760 void CompileUnit::addConstantFPValue(DIE *Die, const MachineOperand &MO) {
761 assert(MO.isFPImm() && "Invalid machine operand!");
762 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
763 APFloat FPImm = MO.getFPImm()->getValueAPF();
765 // Get the raw data form of the floating point.
766 const APInt FltVal = FPImm.bitcastToAPInt();
767 const char *FltPtr = (const char *)FltVal.getRawData();
769 int NumBytes = FltVal.getBitWidth() / 8; // 8 bits per byte.
770 bool LittleEndian = Asm->getDataLayout().isLittleEndian();
771 int Incr = (LittleEndian ? 1 : -1);
772 int Start = (LittleEndian ? 0 : NumBytes - 1);
773 int Stop = (LittleEndian ? NumBytes : -1);
775 // Output the constant to DWARF one byte at a time.
776 for (; Start != Stop; Start += Incr)
777 addUInt(Block, dwarf::DW_FORM_data1, (unsigned char)0xFF & FltPtr[Start]);
779 addBlock(Die, dwarf::DW_AT_const_value, Block);
782 /// addConstantFPValue - Add constant value entry in variable DIE.
783 void CompileUnit::addConstantFPValue(DIE *Die, const ConstantFP *CFP) {
784 // Pass this down to addConstantValue as an unsigned bag of bits.
785 addConstantValue(Die, CFP->getValueAPF().bitcastToAPInt(), true);
788 /// addConstantValue - Add constant value entry in variable DIE.
789 void CompileUnit::addConstantValue(DIE *Die, const ConstantInt *CI,
791 addConstantValue(Die, CI->getValue(), Unsigned);
794 // addConstantValue - Add constant value entry in variable DIE.
795 void CompileUnit::addConstantValue(DIE *Die, const APInt &Val, bool Unsigned) {
796 unsigned CIBitWidth = Val.getBitWidth();
797 if (CIBitWidth <= 64) {
798 // If we're a signed constant definitely use sdata.
800 addSInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata,
805 // Else use data for now unless it's larger than we can deal with.
807 switch (CIBitWidth) {
809 Form = dwarf::DW_FORM_data1;
812 Form = dwarf::DW_FORM_data2;
815 Form = dwarf::DW_FORM_data4;
818 Form = dwarf::DW_FORM_data8;
821 addUInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_udata,
825 addUInt(Die, dwarf::DW_AT_const_value, Form, Val.getZExtValue());
829 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
831 // Get the raw data form of the large APInt.
832 const uint64_t *Ptr64 = Val.getRawData();
834 int NumBytes = Val.getBitWidth() / 8; // 8 bits per byte.
835 bool LittleEndian = Asm->getDataLayout().isLittleEndian();
837 // Output the constant to DWARF one byte at a time.
838 for (int i = 0; i < NumBytes; i++) {
841 c = Ptr64[i / 8] >> (8 * (i & 7));
843 c = Ptr64[(NumBytes - 1 - i) / 8] >> (8 * ((NumBytes - 1 - i) & 7));
844 addUInt(Block, dwarf::DW_FORM_data1, c);
847 addBlock(Die, dwarf::DW_AT_const_value, Block);
850 /// addTemplateParams - Add template parameters into buffer.
851 void CompileUnit::addTemplateParams(DIE &Buffer, DIArray TParams) {
852 // Add template parameters.
853 for (unsigned i = 0, e = TParams.getNumElements(); i != e; ++i) {
854 DIDescriptor Element = TParams.getElement(i);
855 if (Element.isTemplateTypeParameter())
856 constructTemplateTypeParameterDIE(Buffer,
857 DITemplateTypeParameter(Element));
858 else if (Element.isTemplateValueParameter())
859 constructTemplateValueParameterDIE(Buffer,
860 DITemplateValueParameter(Element));
864 /// getOrCreateContextDIE - Get context owner's DIE.
865 DIE *CompileUnit::getOrCreateContextDIE(DIScope Context) {
866 if (!Context || Context.isFile())
868 if (Context.isType())
869 return getOrCreateTypeDIE(DIType(Context));
870 if (Context.isNameSpace())
871 return getOrCreateNameSpace(DINameSpace(Context));
872 if (Context.isSubprogram())
873 return getOrCreateSubprogramDIE(DISubprogram(Context));
874 return getDIE(Context);
877 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
879 DIE *CompileUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
886 // Construct the context before querying for the existence of the DIE in case
887 // such construction creates the DIE.
888 DIE *ContextDIE = getOrCreateContextDIE(resolve(Ty.getContext()));
891 DIE *TyDIE = getDIE(Ty);
896 TyDIE = createAndAddDIE(Ty.getTag(), *ContextDIE, Ty);
898 if (Ty.isBasicType())
899 constructTypeDIE(*TyDIE, DIBasicType(Ty));
900 else if (Ty.isCompositeType())
901 constructTypeDIE(*TyDIE, DICompositeType(Ty));
903 assert(Ty.isDerivedType() && "Unknown kind of DIType");
904 constructTypeDIE(*TyDIE, DIDerivedType(Ty));
906 // If this is a named finished type then include it in the list of types
907 // for the accelerator tables.
908 if (!Ty.getName().empty() && !Ty.isForwardDecl()) {
909 bool IsImplementation = 0;
910 if (Ty.isCompositeType()) {
911 DICompositeType CT(Ty);
912 // A runtime language of 0 actually means C/C++ and that any
913 // non-negative value is some version of Objective-C/C++.
914 IsImplementation = (CT.getRunTimeLang() == 0) || CT.isObjcClassComplete();
916 unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0;
917 addAccelType(Ty.getName(), std::make_pair(TyDIE, Flags));
923 /// addType - Add a new type attribute to the specified entity.
924 void CompileUnit::addType(DIE *Entity, DIType Ty, dwarf::Attribute Attribute) {
925 assert(Ty && "Trying to add a type that doesn't exist?");
927 // Check for pre-existence.
928 DIEEntry *Entry = getDIEEntry(Ty);
929 // If it exists then use the existing value.
931 addDIEEntry(Entity, Attribute, Entry);
936 DIE *Buffer = getOrCreateTypeDIE(Ty);
939 Entry = createDIEEntry(Buffer);
940 insertDIEEntry(Ty, Entry);
941 addDIEEntry(Entity, Attribute, Entry);
943 // If this is a complete composite type then include it in the
944 // list of global types.
948 // Accelerator table mutators - add each name along with its companion
949 // DIE to the proper table while ensuring that the name that we're going
950 // to reference is in the string table. We do this since the names we
951 // add may not only be identical to the names in the DIE.
952 void CompileUnit::addAccelName(StringRef Name, DIE *Die) {
953 DU->getStringPoolEntry(Name);
954 std::vector<DIE *> &DIEs = AccelNames[Name];
958 void CompileUnit::addAccelObjC(StringRef Name, DIE *Die) {
959 DU->getStringPoolEntry(Name);
960 std::vector<DIE *> &DIEs = AccelObjC[Name];
964 void CompileUnit::addAccelNamespace(StringRef Name, DIE *Die) {
965 DU->getStringPoolEntry(Name);
966 std::vector<DIE *> &DIEs = AccelNamespace[Name];
970 void CompileUnit::addAccelType(StringRef Name, std::pair<DIE *, unsigned> Die) {
971 DU->getStringPoolEntry(Name);
972 std::vector<std::pair<DIE *, unsigned> > &DIEs = AccelTypes[Name];
976 /// addGlobalName - Add a new global name to the compile unit.
977 void CompileUnit::addGlobalName(StringRef Name, DIE *Die, DIScope Context) {
978 std::string FullName = getParentContextString(Context) + Name.str();
979 GlobalNames[FullName] = Die;
982 /// addGlobalType - Add a new global type to the compile unit.
984 void CompileUnit::addGlobalType(DIType Ty) {
985 DIScope Context = resolve(Ty.getContext());
986 if (!Ty.getName().empty() && !Ty.isForwardDecl() &&
987 (!Context || Context.isCompileUnit() || Context.isFile() ||
988 Context.isNameSpace()))
989 if (DIEEntry *Entry = getDIEEntry(Ty)) {
990 std::string FullName =
991 getParentContextString(Context) + Ty.getName().str();
992 GlobalTypes[FullName] = Entry->getEntry();
996 /// getParentContextString - Walks the metadata parent chain in a language
997 /// specific manner (using the compile unit language) and returns
998 /// it as a string. This is done at the metadata level because DIEs may
999 /// not currently have been added to the parent context and walking the
1000 /// DIEs looking for names is more expensive than walking the metadata.
1001 std::string CompileUnit::getParentContextString(DIScope Context) const {
1005 // FIXME: Decide whether to implement this for non-C++ languages.
1006 if (getLanguage() != dwarf::DW_LANG_C_plus_plus)
1010 SmallVector<DIScope, 1> Parents;
1011 while (!Context.isCompileUnit()) {
1012 Parents.push_back(Context);
1013 if (Context.getContext())
1014 Context = resolve(Context.getContext());
1016 // Structure, etc types will have a NULL context if they're at the top
1021 // Reverse iterate over our list to go from the outermost construct to the
1023 for (SmallVectorImpl<DIScope>::reverse_iterator I = Parents.rbegin(),
1027 StringRef Name = Ctx.getName();
1028 if (!Name.empty()) {
1036 /// addPubTypes - Add subprogram argument types for pubtypes section.
1037 void CompileUnit::addPubTypes(DISubprogram SP) {
1038 DICompositeType SPTy = SP.getType();
1039 uint16_t SPTag = SPTy.getTag();
1040 if (SPTag != dwarf::DW_TAG_subroutine_type)
1043 DIArray Args = SPTy.getTypeArray();
1044 for (unsigned i = 0, e = Args.getNumElements(); i != e; ++i) {
1045 DIType ATy(Args.getElement(i));
1052 /// constructTypeDIE - Construct basic type die from DIBasicType.
1053 void CompileUnit::constructTypeDIE(DIE &Buffer, DIBasicType BTy) {
1054 // Get core information.
1055 StringRef Name = BTy.getName();
1056 // Add name if not anonymous or intermediate type.
1058 addString(&Buffer, dwarf::DW_AT_name, Name);
1060 // An unspecified type only has a name attribute.
1061 if (BTy.getTag() == dwarf::DW_TAG_unspecified_type)
1064 addUInt(&Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1067 uint64_t Size = BTy.getSizeInBits() >> 3;
1068 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1071 /// constructTypeDIE - Construct derived type die from DIDerivedType.
1072 void CompileUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
1073 // Get core information.
1074 StringRef Name = DTy.getName();
1075 uint64_t Size = DTy.getSizeInBits() >> 3;
1076 uint16_t Tag = Buffer.getTag();
1078 // Map to main type, void will not have a type.
1079 DIType FromTy = resolve(DTy.getTypeDerivedFrom());
1081 addType(&Buffer, FromTy);
1083 // Add name if not anonymous or intermediate type.
1085 addString(&Buffer, dwarf::DW_AT_name, Name);
1087 // Add size if non-zero (derived types might be zero-sized.)
1088 if (Size && Tag != dwarf::DW_TAG_pointer_type)
1089 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1091 if (Tag == dwarf::DW_TAG_ptr_to_member_type)
1092 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
1093 getOrCreateTypeDIE(resolve(DTy.getClassType())));
1094 // Add source line info if available and TyDesc is not a forward declaration.
1095 if (!DTy.isForwardDecl())
1096 addSourceLine(&Buffer, DTy);
1099 /// Return true if the type is appropriately scoped to be contained inside
1100 /// its own type unit.
1101 static bool isTypeUnitScoped(DIType Ty, const DwarfDebug *DD) {
1102 DIScope Parent = DD->resolve(Ty.getContext());
1104 // Don't generate a hash for anything scoped inside a function.
1105 if (Parent.isSubprogram())
1107 Parent = DD->resolve(Parent.getContext());
1112 /// Return true if the type should be split out into a type unit.
1113 static bool shouldCreateTypeUnit(DICompositeType CTy, const DwarfDebug *DD) {
1114 uint16_t Tag = CTy.getTag();
1117 case dwarf::DW_TAG_structure_type:
1118 case dwarf::DW_TAG_union_type:
1119 case dwarf::DW_TAG_enumeration_type:
1120 case dwarf::DW_TAG_class_type:
1121 // If this is a class, structure, union, or enumeration type
1122 // that is a definition (not a declaration), and not scoped
1123 // inside a function then separate this out as a type unit.
1124 return !CTy.isForwardDecl() && isTypeUnitScoped(CTy, DD);
1130 /// constructTypeDIE - Construct type DIE from DICompositeType.
1131 void CompileUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
1132 // Get core information.
1133 StringRef Name = CTy.getName();
1135 uint64_t Size = CTy.getSizeInBits() >> 3;
1136 uint16_t Tag = Buffer.getTag();
1139 case dwarf::DW_TAG_array_type:
1140 constructArrayTypeDIE(Buffer, CTy);
1142 case dwarf::DW_TAG_enumeration_type:
1143 constructEnumTypeDIE(Buffer, CTy);
1145 case dwarf::DW_TAG_subroutine_type: {
1146 // Add return type. A void return won't have a type.
1147 DIArray Elements = CTy.getTypeArray();
1148 DIDescriptor RTy = Elements.getElement(0);
1150 addType(&Buffer, DIType(RTy));
1152 bool isPrototyped = true;
1154 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
1155 DIDescriptor Ty = Elements.getElement(i);
1156 if (Ty.isUnspecifiedParameter()) {
1157 createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
1158 isPrototyped = false;
1160 DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
1161 addType(Arg, DIType(Ty));
1162 if (DIType(Ty).isArtificial())
1163 addFlag(Arg, dwarf::DW_AT_artificial);
1166 // Add prototype flag if we're dealing with a C language and the
1167 // function has been prototyped.
1168 uint16_t Language = getLanguage();
1170 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1171 Language == dwarf::DW_LANG_ObjC))
1172 addFlag(&Buffer, dwarf::DW_AT_prototyped);
1174 case dwarf::DW_TAG_structure_type:
1175 case dwarf::DW_TAG_union_type:
1176 case dwarf::DW_TAG_class_type: {
1177 // Add elements to structure type.
1178 DIArray Elements = CTy.getTypeArray();
1179 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1180 DIDescriptor Element = Elements.getElement(i);
1181 DIE *ElemDie = NULL;
1182 if (Element.isSubprogram()) {
1183 DISubprogram SP(Element);
1184 ElemDie = getOrCreateSubprogramDIE(DISubprogram(Element));
1185 if (SP.isProtected())
1186 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1187 dwarf::DW_ACCESS_protected);
1188 else if (SP.isPrivate())
1189 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1190 dwarf::DW_ACCESS_private);
1192 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1193 dwarf::DW_ACCESS_public);
1194 if (SP.isExplicit())
1195 addFlag(ElemDie, dwarf::DW_AT_explicit);
1196 } else if (Element.isDerivedType()) {
1197 DIDerivedType DDTy(Element);
1198 if (DDTy.getTag() == dwarf::DW_TAG_friend) {
1199 ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
1200 addType(ElemDie, resolve(DDTy.getTypeDerivedFrom()),
1201 dwarf::DW_AT_friend);
1202 } else if (DDTy.isStaticMember()) {
1203 getOrCreateStaticMemberDIE(DDTy);
1205 constructMemberDIE(Buffer, DDTy);
1207 } else if (Element.isObjCProperty()) {
1208 DIObjCProperty Property(Element);
1209 ElemDie = createAndAddDIE(Property.getTag(), Buffer);
1210 StringRef PropertyName = Property.getObjCPropertyName();
1211 addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
1212 addType(ElemDie, Property.getType());
1213 addSourceLine(ElemDie, Property);
1214 StringRef GetterName = Property.getObjCPropertyGetterName();
1215 if (!GetterName.empty())
1216 addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
1217 StringRef SetterName = Property.getObjCPropertySetterName();
1218 if (!SetterName.empty())
1219 addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
1220 unsigned PropertyAttributes = 0;
1221 if (Property.isReadOnlyObjCProperty())
1222 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readonly;
1223 if (Property.isReadWriteObjCProperty())
1224 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readwrite;
1225 if (Property.isAssignObjCProperty())
1226 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_assign;
1227 if (Property.isRetainObjCProperty())
1228 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_retain;
1229 if (Property.isCopyObjCProperty())
1230 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_copy;
1231 if (Property.isNonAtomicObjCProperty())
1232 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_nonatomic;
1233 if (PropertyAttributes)
1234 addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, None,
1235 PropertyAttributes);
1237 DIEEntry *Entry = getDIEEntry(Element);
1239 Entry = createDIEEntry(ElemDie);
1240 insertDIEEntry(Element, Entry);
1246 if (CTy.isAppleBlockExtension())
1247 addFlag(&Buffer, dwarf::DW_AT_APPLE_block);
1249 DICompositeType ContainingType(resolve(CTy.getContainingType()));
1250 if (DIDescriptor(ContainingType).isCompositeType())
1251 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
1252 getOrCreateTypeDIE(DIType(ContainingType)));
1254 if (CTy.isObjcClassComplete())
1255 addFlag(&Buffer, dwarf::DW_AT_APPLE_objc_complete_type);
1257 // Add template parameters to a class, structure or union types.
1258 // FIXME: The support isn't in the metadata for this yet.
1259 if (Tag == dwarf::DW_TAG_class_type ||
1260 Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type)
1261 addTemplateParams(Buffer, CTy.getTemplateParams());
1269 // Add name if not anonymous or intermediate type.
1271 addString(&Buffer, dwarf::DW_AT_name, Name);
1273 if (Tag == dwarf::DW_TAG_enumeration_type ||
1274 Tag == dwarf::DW_TAG_class_type || Tag == dwarf::DW_TAG_structure_type ||
1275 Tag == dwarf::DW_TAG_union_type) {
1276 // Add size if non-zero (derived types might be zero-sized.)
1277 // TODO: Do we care about size for enum forward declarations?
1279 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1280 else if (!CTy.isForwardDecl())
1281 // Add zero size if it is not a forward declaration.
1282 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, 0);
1284 // If we're a forward decl, say so.
1285 if (CTy.isForwardDecl())
1286 addFlag(&Buffer, dwarf::DW_AT_declaration);
1288 // Add source line info if available.
1289 if (!CTy.isForwardDecl())
1290 addSourceLine(&Buffer, CTy);
1292 // No harm in adding the runtime language to the declaration.
1293 unsigned RLang = CTy.getRunTimeLang();
1295 addUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class, dwarf::DW_FORM_data1,
1298 // If this is a type applicable to a type unit it then add it to the
1299 // list of types we'll compute a hash for later.
1300 if (shouldCreateTypeUnit(CTy, DD))
1301 DD->addTypeUnitType(&Buffer);
1304 /// constructTemplateTypeParameterDIE - Construct new DIE for the given
1305 /// DITemplateTypeParameter.
1307 CompileUnit::constructTemplateTypeParameterDIE(DIE &Buffer,
1308 DITemplateTypeParameter TP) {
1310 createAndAddDIE(dwarf::DW_TAG_template_type_parameter, Buffer);
1311 // Add the type if it exists, it could be void and therefore no type.
1313 addType(ParamDIE, resolve(TP.getType()));
1314 if (!TP.getName().empty())
1315 addString(ParamDIE, dwarf::DW_AT_name, TP.getName());
1318 /// constructTemplateValueParameterDIE - Construct new DIE for the given
1319 /// DITemplateValueParameter.
1321 CompileUnit::constructTemplateValueParameterDIE(DIE &Buffer,
1322 DITemplateValueParameter VP) {
1323 DIE *ParamDIE = createAndAddDIE(VP.getTag(), Buffer);
1325 // Add the type if there is one, template template and template parameter
1326 // packs will not have a type.
1327 if (VP.getTag() == dwarf::DW_TAG_template_value_parameter)
1328 addType(ParamDIE, resolve(VP.getType()));
1329 if (!VP.getName().empty())
1330 addString(ParamDIE, dwarf::DW_AT_name, VP.getName());
1331 if (Value *Val = VP.getValue()) {
1332 if (ConstantInt *CI = dyn_cast<ConstantInt>(Val))
1333 addConstantValue(ParamDIE, CI,
1334 isUnsignedDIType(DD, resolve(VP.getType())));
1335 else if (GlobalValue *GV = dyn_cast<GlobalValue>(Val)) {
1336 // For declaration non-type template parameters (such as global values and
1338 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1339 addOpAddress(Block, Asm->getSymbol(GV));
1340 // Emit DW_OP_stack_value to use the address as the immediate value of the
1341 // parameter, rather than a pointer to it.
1342 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
1343 addBlock(ParamDIE, dwarf::DW_AT_location, Block);
1344 } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_template_param) {
1345 assert(isa<MDString>(Val));
1346 addString(ParamDIE, dwarf::DW_AT_GNU_template_name,
1347 cast<MDString>(Val)->getString());
1348 } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_parameter_pack) {
1349 assert(isa<MDNode>(Val));
1350 DIArray A(cast<MDNode>(Val));
1351 addTemplateParams(*ParamDIE, A);
1356 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
1357 DIE *CompileUnit::getOrCreateNameSpace(DINameSpace NS) {
1358 // Construct the context before querying for the existence of the DIE in case
1359 // such construction creates the DIE.
1360 DIE *ContextDIE = getOrCreateContextDIE(NS.getContext());
1362 DIE *NDie = getDIE(NS);
1365 NDie = createAndAddDIE(dwarf::DW_TAG_namespace, *ContextDIE, NS);
1367 if (!NS.getName().empty()) {
1368 addString(NDie, dwarf::DW_AT_name, NS.getName());
1369 addAccelNamespace(NS.getName(), NDie);
1370 addGlobalName(NS.getName(), NDie, NS.getContext());
1372 addAccelNamespace("(anonymous namespace)", NDie);
1373 addSourceLine(NDie, NS);
1377 /// getOrCreateSubprogramDIE - Create new DIE using SP.
1378 DIE *CompileUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
1379 // Construct the context before querying for the existence of the DIE in case
1380 // such construction creates the DIE (as is the case for member function
1382 DIE *ContextDIE = getOrCreateContextDIE(resolve(SP.getContext()));
1384 DIE *SPDie = getDIE(SP);
1388 DISubprogram SPDecl = SP.getFunctionDeclaration();
1389 if (SPDecl.isSubprogram())
1390 // Add subprogram definitions to the CU die directly.
1391 ContextDIE = CUDie.get();
1393 // DW_TAG_inlined_subroutine may refer to this DIE.
1394 SPDie = createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, SP);
1396 DIE *DeclDie = NULL;
1397 if (SPDecl.isSubprogram())
1398 DeclDie = getOrCreateSubprogramDIE(SPDecl);
1400 // Add function template parameters.
1401 addTemplateParams(*SPDie, SP.getTemplateParams());
1403 // If this DIE is going to refer declaration info using AT_specification
1404 // then there is no need to add other attributes.
1406 // Refer function declaration directly.
1407 addDIEEntry(SPDie, dwarf::DW_AT_specification, DeclDie);
1412 // Add the linkage name if we have one.
1413 StringRef LinkageName = SP.getLinkageName();
1414 if (!LinkageName.empty())
1415 addString(SPDie, dwarf::DW_AT_MIPS_linkage_name,
1416 GlobalValue::getRealLinkageName(LinkageName));
1418 // Constructors and operators for anonymous aggregates do not have names.
1419 if (!SP.getName().empty())
1420 addString(SPDie, dwarf::DW_AT_name, SP.getName());
1422 addSourceLine(SPDie, SP);
1424 // Add the prototype if we have a prototype and we have a C like
1426 uint16_t Language = getLanguage();
1427 if (SP.isPrototyped() &&
1428 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1429 Language == dwarf::DW_LANG_ObjC))
1430 addFlag(SPDie, dwarf::DW_AT_prototyped);
1432 DICompositeType SPTy = SP.getType();
1433 assert(SPTy.getTag() == dwarf::DW_TAG_subroutine_type &&
1434 "the type of a subprogram should be a subroutine");
1436 DIArray Args = SPTy.getTypeArray();
1437 // Add a return type. If this is a type like a C/C++ void type we don't add a
1439 if (Args.getElement(0))
1440 addType(SPDie, DIType(Args.getElement(0)));
1442 unsigned VK = SP.getVirtuality();
1444 addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
1445 DIEBlock *Block = getDIEBlock();
1446 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1447 addUInt(Block, dwarf::DW_FORM_udata, SP.getVirtualIndex());
1448 addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, Block);
1449 ContainingTypeMap.insert(
1450 std::make_pair(SPDie, resolve(SP.getContainingType())));
1453 if (!SP.isDefinition()) {
1454 addFlag(SPDie, dwarf::DW_AT_declaration);
1456 // Add arguments. Do not add arguments for subprogram definition. They will
1457 // be handled while processing variables.
1458 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
1459 DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, *SPDie);
1460 DIType ATy = DIType(Args.getElement(i));
1462 if (ATy.isArtificial())
1463 addFlag(Arg, dwarf::DW_AT_artificial);
1467 if (SP.isArtificial())
1468 addFlag(SPDie, dwarf::DW_AT_artificial);
1470 if (!SP.isLocalToUnit())
1471 addFlag(SPDie, dwarf::DW_AT_external);
1473 if (SP.isOptimized())
1474 addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);
1476 if (unsigned isa = Asm->getISAEncoding()) {
1477 addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
1483 // Return const expression if value is a GEP to access merged global
1485 // i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
1486 static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
1487 const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
1488 if (!CE || CE->getNumOperands() != 3 ||
1489 CE->getOpcode() != Instruction::GetElementPtr)
1492 // First operand points to a global struct.
1493 Value *Ptr = CE->getOperand(0);
1494 if (!isa<GlobalValue>(Ptr) ||
1495 !isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
1498 // Second operand is zero.
1499 const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
1500 if (!CI || !CI->isZero())
1503 // Third operand is offset.
1504 if (!isa<ConstantInt>(CE->getOperand(2)))
1510 /// createGlobalVariableDIE - create global variable DIE.
1511 void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
1512 DIGlobalVariable GV(N);
1514 // Check for pre-existence.
1518 if (!GV.isGlobalVariable())
1521 DIScope GVContext = GV.getContext();
1522 DIType GTy = GV.getType();
1524 // If this is a static data member definition, some attributes belong
1525 // to the declaration DIE.
1526 DIE *VariableDIE = NULL;
1527 bool IsStaticMember = false;
1528 DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration();
1529 if (SDMDecl.Verify()) {
1530 assert(SDMDecl.isStaticMember() && "Expected static member decl");
1531 // We need the declaration DIE that is in the static member's class.
1532 VariableDIE = getOrCreateStaticMemberDIE(SDMDecl);
1533 IsStaticMember = true;
1536 // If this is not a static data member definition, create the variable
1537 // DIE and add the initial set of attributes to it.
1539 // Construct the context before querying for the existence of the DIE in
1540 // case such construction creates the DIE.
1541 DIE *ContextDIE = getOrCreateContextDIE(GVContext);
1544 VariableDIE = createAndAddDIE(GV.getTag(), *ContextDIE, N);
1546 // Add name and type.
1547 addString(VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
1548 addType(VariableDIE, GTy);
1550 // Add scoping info.
1551 if (!GV.isLocalToUnit())
1552 addFlag(VariableDIE, dwarf::DW_AT_external);
1554 // Add line number info.
1555 addSourceLine(VariableDIE, GV);
1559 bool addToAccelTable = false;
1560 DIE *VariableSpecDIE = NULL;
1561 bool isGlobalVariable = GV.getGlobal() != NULL;
1562 if (isGlobalVariable) {
1563 addToAccelTable = true;
1564 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1565 const MCSymbol *Sym = Asm->getSymbol(GV.getGlobal());
1566 if (GV.getGlobal()->isThreadLocal()) {
1567 // FIXME: Make this work with -gsplit-dwarf.
1568 unsigned PointerSize = Asm->getDataLayout().getPointerSize();
1569 assert((PointerSize == 4 || PointerSize == 8) &&
1570 "Add support for other sizes if necessary");
1571 const MCExpr *Expr =
1572 Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym);
1573 // Based on GCC's support for TLS:
1574 if (!DD->useSplitDwarf()) {
1575 // 1) Start with a constNu of the appropriate pointer size
1576 addUInt(Block, dwarf::DW_FORM_data1,
1577 PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
1578 // 2) containing the (relocated) offset of the TLS variable
1579 // within the module's TLS block.
1580 addExpr(Block, dwarf::DW_FORM_udata, Expr);
1582 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
1583 addUInt(Block, dwarf::DW_FORM_udata, DU->getAddrPoolIndex(Expr));
1585 // 3) followed by a custom OP to make the debugger do a TLS lookup.
1586 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
1588 addOpAddress(Block, Sym);
1589 // Do not create specification DIE if context is either compile unit
1591 if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
1592 !GVContext.isFile() && !DD->isSubprogramContext(GVContext)) {
1593 // Create specification DIE.
1594 VariableSpecDIE = createAndAddDIE(dwarf::DW_TAG_variable, *CUDie.get());
1595 addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification, VariableDIE);
1596 addBlock(VariableSpecDIE, dwarf::DW_AT_location, Block);
1597 // A static member's declaration is already flagged as such.
1598 if (!SDMDecl.Verify())
1599 addFlag(VariableDIE, dwarf::DW_AT_declaration);
1601 addBlock(VariableDIE, dwarf::DW_AT_location, Block);
1603 // Add the linkage name.
1604 StringRef LinkageName = GV.getLinkageName();
1605 if (!LinkageName.empty())
1606 // From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
1607 // TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
1609 addString(IsStaticMember && VariableSpecDIE ? VariableSpecDIE
1611 dwarf::DW_AT_MIPS_linkage_name,
1612 GlobalValue::getRealLinkageName(LinkageName));
1613 } else if (const ConstantInt *CI =
1614 dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
1615 // AT_const_value was added when the static member was created. To avoid
1616 // emitting AT_const_value multiple times, we only add AT_const_value when
1617 // it is not a static member.
1618 if (!IsStaticMember)
1619 addConstantValue(VariableDIE, CI, isUnsignedDIType(DD, GTy));
1620 } else if (const ConstantExpr *CE = getMergedGlobalExpr(N->getOperand(11))) {
1621 addToAccelTable = true;
1622 // GV is a merged global.
1623 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1624 Value *Ptr = CE->getOperand(0);
1625 addOpAddress(Block, Asm->getSymbol(cast<GlobalValue>(Ptr)));
1626 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1627 SmallVector<Value *, 3> Idx(CE->op_begin() + 1, CE->op_end());
1628 addUInt(Block, dwarf::DW_FORM_udata,
1629 Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx));
1630 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1631 addBlock(VariableDIE, dwarf::DW_AT_location, Block);
1634 if (addToAccelTable) {
1635 DIE *AddrDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
1636 addAccelName(GV.getName(), AddrDIE);
1638 // If the linkage name is different than the name, go ahead and output
1639 // that as well into the name table.
1640 if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
1641 addAccelName(GV.getLinkageName(), AddrDIE);
1644 if (!GV.isLocalToUnit())
1645 addGlobalName(GV.getName(), VariableSpecDIE ? VariableSpecDIE : VariableDIE,
1649 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
1650 void CompileUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR,
1652 DIE *DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
1653 addDIEEntry(DW_Subrange, dwarf::DW_AT_type, IndexTy);
1655 // The LowerBound value defines the lower bounds which is typically zero for
1656 // C/C++. The Count value is the number of elements. Values are 64 bit. If
1657 // Count == -1 then the array is unbounded and we do not emit
1658 // DW_AT_lower_bound and DW_AT_upper_bound attributes. If LowerBound == 0 and
1659 // Count == 0, then the array has zero elements in which case we do not emit
1661 int64_t LowerBound = SR.getLo();
1662 int64_t DefaultLowerBound = getDefaultLowerBound();
1663 int64_t Count = SR.getCount();
1665 if (DefaultLowerBound == -1 || LowerBound != DefaultLowerBound)
1666 addUInt(DW_Subrange, dwarf::DW_AT_lower_bound, None, LowerBound);
1668 if (Count != -1 && Count != 0)
1669 // FIXME: An unbounded array should reference the expression that defines
1671 addUInt(DW_Subrange, dwarf::DW_AT_upper_bound, None,
1672 LowerBound + Count - 1);
1675 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
1676 void CompileUnit::constructArrayTypeDIE(DIE &Buffer, DICompositeType CTy) {
1678 addFlag(&Buffer, dwarf::DW_AT_GNU_vector);
1680 // Emit the element type.
1681 addType(&Buffer, resolve(CTy.getTypeDerivedFrom()));
1683 // Get an anonymous type for index type.
1684 // FIXME: This type should be passed down from the front end
1685 // as different languages may have different sizes for indexes.
1686 DIE *IdxTy = getIndexTyDie();
1688 // Construct an anonymous type for index type.
1689 IdxTy = createAndAddDIE(dwarf::DW_TAG_base_type, *CUDie.get());
1690 addString(IdxTy, dwarf::DW_AT_name, "int");
1691 addUInt(IdxTy, dwarf::DW_AT_byte_size, None, sizeof(int32_t));
1692 addUInt(IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1693 dwarf::DW_ATE_signed);
1694 setIndexTyDie(IdxTy);
1697 // Add subranges to array type.
1698 DIArray Elements = CTy.getTypeArray();
1699 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1700 DIDescriptor Element = Elements.getElement(i);
1701 if (Element.getTag() == dwarf::DW_TAG_subrange_type)
1702 constructSubrangeDIE(Buffer, DISubrange(Element), IdxTy);
1706 /// constructEnumTypeDIE - Construct an enum type DIE from DICompositeType.
1707 void CompileUnit::constructEnumTypeDIE(DIE &Buffer, DICompositeType CTy) {
1708 DIArray Elements = CTy.getTypeArray();
1710 // Add enumerators to enumeration type.
1711 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1712 DIDescriptor Enum(Elements.getElement(i));
1713 DIEnumerator ETy = DIEnumerator(Enum);
1714 if (Enum.isEnumerator()) {
1715 DIE *Enumerator = createAndAddDIE(dwarf::DW_TAG_enumerator, Buffer);
1716 StringRef Name = ETy.getName();
1717 addString(Enumerator, dwarf::DW_AT_name, Name);
1718 int64_t Value = ETy.getEnumValue();
1719 addSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, Value);
1722 DIType DTy = resolve(CTy.getTypeDerivedFrom());
1724 addType(&Buffer, DTy);
1725 addFlag(&Buffer, dwarf::DW_AT_enum_class);
1729 /// constructContainingTypeDIEs - Construct DIEs for types that contain
1731 void CompileUnit::constructContainingTypeDIEs() {
1732 for (DenseMap<DIE *, const MDNode *>::iterator CI = ContainingTypeMap.begin(),
1733 CE = ContainingTypeMap.end();
1735 DIE *SPDie = CI->first;
1736 DIDescriptor D(CI->second);
1739 DIE *NDie = getDIE(D);
1742 addDIEEntry(SPDie, dwarf::DW_AT_containing_type, NDie);
1746 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
1747 DIE *CompileUnit::constructVariableDIE(DbgVariable &DV, bool isScopeAbstract) {
1748 StringRef Name = DV.getName();
1750 // Define variable debug information entry.
1751 DIE *VariableDie = new DIE(DV.getTag());
1752 DbgVariable *AbsVar = DV.getAbstractVariable();
1753 DIE *AbsDIE = AbsVar ? AbsVar->getDIE() : NULL;
1755 addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin, AbsDIE);
1758 addString(VariableDie, dwarf::DW_AT_name, Name);
1759 addSourceLine(VariableDie, DV.getVariable());
1760 addType(VariableDie, DV.getType());
1763 if (DV.isArtificial())
1764 addFlag(VariableDie, dwarf::DW_AT_artificial);
1766 if (isScopeAbstract) {
1767 DV.setDIE(VariableDie);
1771 // Add variable address.
1773 unsigned Offset = DV.getDotDebugLocOffset();
1774 if (Offset != ~0U) {
1775 addLabel(VariableDie, dwarf::DW_AT_location,
1776 DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
1777 : dwarf::DW_FORM_data4,
1778 Asm->GetTempSymbol("debug_loc", Offset));
1779 DV.setDIE(VariableDie);
1783 // Check if variable is described by a DBG_VALUE instruction.
1784 if (const MachineInstr *DVInsn = DV.getMInsn()) {
1785 assert(DVInsn->getNumOperands() == 3);
1786 if (DVInsn->getOperand(0).isReg()) {
1787 const MachineOperand RegOp = DVInsn->getOperand(0);
1788 // If the second operand is an immediate, this is an indirect value.
1789 if (DVInsn->getOperand(1).isImm()) {
1790 MachineLocation Location(RegOp.getReg(),
1791 DVInsn->getOperand(1).getImm());
1792 addVariableAddress(DV, VariableDie, Location);
1793 } else if (RegOp.getReg())
1794 addVariableAddress(DV, VariableDie, MachineLocation(RegOp.getReg()));
1795 } else if (DVInsn->getOperand(0).isImm())
1796 addConstantValue(VariableDie, DVInsn->getOperand(0), DV.getType());
1797 else if (DVInsn->getOperand(0).isFPImm())
1798 addConstantFPValue(VariableDie, DVInsn->getOperand(0));
1799 else if (DVInsn->getOperand(0).isCImm())
1800 addConstantValue(VariableDie, DVInsn->getOperand(0).getCImm(),
1801 isUnsignedDIType(DD, DV.getType()));
1803 DV.setDIE(VariableDie);
1806 // .. else use frame index.
1807 int FI = DV.getFrameIndex();
1809 unsigned FrameReg = 0;
1810 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
1811 int Offset = TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
1812 MachineLocation Location(FrameReg, Offset);
1813 addVariableAddress(DV, VariableDie, Location);
1817 DV.setDIE(VariableDie);
1821 /// constructMemberDIE - Construct member DIE from DIDerivedType.
1822 void CompileUnit::constructMemberDIE(DIE &Buffer, DIDerivedType DT) {
1823 DIE *MemberDie = createAndAddDIE(DT.getTag(), Buffer);
1824 StringRef Name = DT.getName();
1826 addString(MemberDie, dwarf::DW_AT_name, Name);
1828 addType(MemberDie, resolve(DT.getTypeDerivedFrom()));
1830 addSourceLine(MemberDie, DT);
1832 DIEBlock *MemLocationDie = new (DIEValueAllocator) DIEBlock();
1833 addUInt(MemLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
1835 if (DT.getTag() == dwarf::DW_TAG_inheritance && DT.isVirtual()) {
1837 // For C++, virtual base classes are not at fixed offset. Use following
1838 // expression to extract appropriate offset from vtable.
1839 // BaseAddr = ObAddr + *((*ObAddr) - Offset)
1841 DIEBlock *VBaseLocationDie = new (DIEValueAllocator) DIEBlock();
1842 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
1843 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1844 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1845 addUInt(VBaseLocationDie, dwarf::DW_FORM_udata, DT.getOffsetInBits());
1846 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
1847 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1848 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1850 addBlock(MemberDie, dwarf::DW_AT_data_member_location, VBaseLocationDie);
1852 uint64_t Size = DT.getSizeInBits();
1853 uint64_t FieldSize = getBaseTypeSize(DD, DT);
1854 uint64_t OffsetInBytes;
1856 if (Size != FieldSize) {
1858 addUInt(MemberDie, dwarf::DW_AT_byte_size, None,
1859 getBaseTypeSize(DD, DT) >> 3);
1860 addUInt(MemberDie, dwarf::DW_AT_bit_size, None, DT.getSizeInBits());
1862 uint64_t Offset = DT.getOffsetInBits();
1863 uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
1864 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1865 uint64_t FieldOffset = (HiMark - FieldSize);
1866 Offset -= FieldOffset;
1868 // Maybe we need to work from the other end.
1869 if (Asm->getDataLayout().isLittleEndian())
1870 Offset = FieldSize - (Offset + Size);
1871 addUInt(MemberDie, dwarf::DW_AT_bit_offset, None, Offset);
1873 // Here WD_AT_data_member_location points to the anonymous
1874 // field that includes this bit field.
1875 OffsetInBytes = FieldOffset >> 3;
1877 // This is not a bitfield.
1878 OffsetInBytes = DT.getOffsetInBits() >> 3;
1879 addUInt(MemberDie, dwarf::DW_AT_data_member_location, None, OffsetInBytes);
1882 if (DT.isProtected())
1883 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1884 dwarf::DW_ACCESS_protected);
1885 else if (DT.isPrivate())
1886 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1887 dwarf::DW_ACCESS_private);
1888 // Otherwise C++ member and base classes are considered public.
1890 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1891 dwarf::DW_ACCESS_public);
1893 addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1,
1894 dwarf::DW_VIRTUALITY_virtual);
1896 // Objective-C properties.
1897 if (MDNode *PNode = DT.getObjCProperty())
1898 if (DIEEntry *PropertyDie = getDIEEntry(PNode))
1899 MemberDie->addValue(dwarf::DW_AT_APPLE_property, dwarf::DW_FORM_ref4,
1902 if (DT.isArtificial())
1903 addFlag(MemberDie, dwarf::DW_AT_artificial);
1906 /// getOrCreateStaticMemberDIE - Create new DIE for C++ static member.
1907 DIE *CompileUnit::getOrCreateStaticMemberDIE(DIDerivedType DT) {
1911 // Construct the context before querying for the existence of the DIE in case
1912 // such construction creates the DIE.
1913 DIE *ContextDIE = getOrCreateContextDIE(resolve(DT.getContext()));
1914 assert(dwarf::isType(ContextDIE->getTag()) &&
1915 "Static member should belong to a type.");
1917 DIE *StaticMemberDIE = getDIE(DT);
1918 if (StaticMemberDIE)
1919 return StaticMemberDIE;
1921 StaticMemberDIE = createAndAddDIE(DT.getTag(), *ContextDIE, DT);
1923 DIType Ty = resolve(DT.getTypeDerivedFrom());
1925 addString(StaticMemberDIE, dwarf::DW_AT_name, DT.getName());
1926 addType(StaticMemberDIE, Ty);
1927 addSourceLine(StaticMemberDIE, DT);
1928 addFlag(StaticMemberDIE, dwarf::DW_AT_external);
1929 addFlag(StaticMemberDIE, dwarf::DW_AT_declaration);
1931 // FIXME: We could omit private if the parent is a class_type, and
1932 // public if the parent is something else.
1933 if (DT.isProtected())
1934 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1935 dwarf::DW_ACCESS_protected);
1936 else if (DT.isPrivate())
1937 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1938 dwarf::DW_ACCESS_private);
1940 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1941 dwarf::DW_ACCESS_public);
1943 if (const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(DT.getConstant()))
1944 addConstantValue(StaticMemberDIE, CI, isUnsignedDIType(DD, Ty));
1945 if (const ConstantFP *CFP = dyn_cast_or_null<ConstantFP>(DT.getConstant()))
1946 addConstantFPValue(StaticMemberDIE, CFP);
1948 return StaticMemberDIE;
1951 void CompileUnit::emitHeader(const MCSection *ASection,
1952 const MCSymbol *ASectionSym) {
1953 Asm->OutStreamer.AddComment("DWARF version number");
1954 Asm->EmitInt16(DD->getDwarfVersion());
1955 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
1956 Asm->EmitSectionOffset(Asm->GetTempSymbol(ASection->getLabelBeginName()),
1958 Asm->OutStreamer.AddComment("Address Size (in bytes)");
1959 Asm->EmitInt8(Asm->getDataLayout().getPointerSize());