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, const MDNode *N, AsmPrinter *A,
37 DwarfDebug *DW, DwarfUnits *DWU)
38 : UniqueID(UID), Node(N), CUDie(D), Asm(A), DD(DW), DU(DWU), IndexTyDie(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 (DICompileUnit(Node).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(const MDNode *N) const {
114 if (isShareableAcrossCUs(DIDescriptor(N)))
115 return DD->getDIE(N);
116 return MDNodeToDieMap.lookup(N);
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(const MDNode *N, DIE *D) {
123 if (isShareableAcrossCUs(DIDescriptor(N))) {
127 MDNodeToDieMap.insert(std::make_pair(N, 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);
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()));
889 // TODO: Investigate if this beavior is intentional and possibly
890 // replace it with an assert.
892 ContextDIE = getCUDie();
894 DIE *TyDIE = getDIE(Ty);
899 TyDIE = createAndAddDIE(Ty.getTag(), *ContextDIE, Ty);
901 if (Ty.isBasicType())
902 constructTypeDIE(*TyDIE, DIBasicType(Ty));
903 else if (Ty.isCompositeType())
904 constructTypeDIE(*TyDIE, DICompositeType(Ty));
906 assert(Ty.isDerivedType() && "Unknown kind of DIType");
907 constructTypeDIE(*TyDIE, DIDerivedType(Ty));
909 // If this is a named finished type then include it in the list of types
910 // for the accelerator tables.
911 if (!Ty.getName().empty() && !Ty.isForwardDecl()) {
912 bool IsImplementation = 0;
913 if (Ty.isCompositeType()) {
914 DICompositeType CT(Ty);
915 // A runtime language of 0 actually means C/C++ and that any
916 // non-negative value is some version of Objective-C/C++.
917 IsImplementation = (CT.getRunTimeLang() == 0) || CT.isObjcClassComplete();
919 unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0;
920 addAccelType(Ty.getName(), std::make_pair(TyDIE, Flags));
926 /// addType - Add a new type attribute to the specified entity.
927 void CompileUnit::addType(DIE *Entity, DIType Ty, dwarf::Attribute Attribute) {
928 assert(Ty && "Trying to add a type that doesn't exist?");
930 // Check for pre-existence.
931 DIEEntry *Entry = getDIEEntry(Ty);
932 // If it exists then use the existing value.
934 addDIEEntry(Entity, Attribute, Entry);
939 DIE *Buffer = getOrCreateTypeDIE(Ty);
942 Entry = createDIEEntry(Buffer);
943 insertDIEEntry(Ty, Entry);
944 addDIEEntry(Entity, Attribute, Entry);
946 // If this is a complete composite type then include it in the
947 // list of global types.
951 // Accelerator table mutators - add each name along with its companion
952 // DIE to the proper table while ensuring that the name that we're going
953 // to reference is in the string table. We do this since the names we
954 // add may not only be identical to the names in the DIE.
955 void CompileUnit::addAccelName(StringRef Name, DIE *Die) {
956 DU->getStringPoolEntry(Name);
957 std::vector<DIE *> &DIEs = AccelNames[Name];
961 void CompileUnit::addAccelObjC(StringRef Name, DIE *Die) {
962 DU->getStringPoolEntry(Name);
963 std::vector<DIE *> &DIEs = AccelObjC[Name];
967 void CompileUnit::addAccelNamespace(StringRef Name, DIE *Die) {
968 DU->getStringPoolEntry(Name);
969 std::vector<DIE *> &DIEs = AccelNamespace[Name];
973 void CompileUnit::addAccelType(StringRef Name, std::pair<DIE *, unsigned> Die) {
974 DU->getStringPoolEntry(Name);
975 std::vector<std::pair<DIE *, unsigned> > &DIEs = AccelTypes[Name];
979 /// addGlobalName - Add a new global name to the compile unit.
980 void CompileUnit::addGlobalName(StringRef Name, DIE *Die, DIScope Context) {
981 std::string FullName = getParentContextString(Context) + Name.str();
982 GlobalNames[FullName] = Die;
985 /// addGlobalType - Add a new global type to the compile unit.
987 void CompileUnit::addGlobalType(DIType Ty) {
988 DIScope Context = resolve(Ty.getContext());
989 if (!Ty.getName().empty() && !Ty.isForwardDecl() &&
990 (!Context || Context.isCompileUnit() || Context.isFile() ||
991 Context.isNameSpace()))
992 if (DIEEntry *Entry = getDIEEntry(Ty)) {
993 std::string FullName =
994 getParentContextString(Context) + Ty.getName().str();
995 GlobalTypes[FullName] = Entry->getEntry();
999 /// getParentContextString - Walks the metadata parent chain in a language
1000 /// specific manner (using the compile unit language) and returns
1001 /// it as a string. This is done at the metadata level because DIEs may
1002 /// not currently have been added to the parent context and walking the
1003 /// DIEs looking for names is more expensive than walking the metadata.
1004 std::string CompileUnit::getParentContextString(DIScope Context) const {
1008 // FIXME: Decide whether to implement this for non-C++ languages.
1009 if (getLanguage() != dwarf::DW_LANG_C_plus_plus)
1013 SmallVector<DIScope, 1> Parents;
1014 while (!Context.isCompileUnit()) {
1015 Parents.push_back(Context);
1016 if (Context.getContext())
1017 Context = resolve(Context.getContext());
1019 // Structure, etc types will have a NULL context if they're at the top
1024 // Reverse iterate over our list to go from the outermost construct to the
1026 for (SmallVectorImpl<DIScope>::reverse_iterator I = Parents.rbegin(),
1030 StringRef Name = Ctx.getName();
1031 if (!Name.empty()) {
1039 /// addPubTypes - Add subprogram argument types for pubtypes section.
1040 void CompileUnit::addPubTypes(DISubprogram SP) {
1041 DICompositeType SPTy = SP.getType();
1042 uint16_t SPTag = SPTy.getTag();
1043 if (SPTag != dwarf::DW_TAG_subroutine_type)
1046 DIArray Args = SPTy.getTypeArray();
1047 for (unsigned i = 0, e = Args.getNumElements(); i != e; ++i) {
1048 DIType ATy(Args.getElement(i));
1055 /// constructTypeDIE - Construct basic type die from DIBasicType.
1056 void CompileUnit::constructTypeDIE(DIE &Buffer, DIBasicType BTy) {
1057 // Get core information.
1058 StringRef Name = BTy.getName();
1059 // Add name if not anonymous or intermediate type.
1061 addString(&Buffer, dwarf::DW_AT_name, Name);
1063 // An unspecified type only has a name attribute.
1064 if (BTy.getTag() == dwarf::DW_TAG_unspecified_type)
1067 addUInt(&Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1070 uint64_t Size = BTy.getSizeInBits() >> 3;
1071 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1074 /// constructTypeDIE - Construct derived type die from DIDerivedType.
1075 void CompileUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
1076 // Get core information.
1077 StringRef Name = DTy.getName();
1078 uint64_t Size = DTy.getSizeInBits() >> 3;
1079 uint16_t Tag = Buffer.getTag();
1081 // Map to main type, void will not have a type.
1082 DIType FromTy = resolve(DTy.getTypeDerivedFrom());
1084 addType(&Buffer, FromTy);
1086 // Add name if not anonymous or intermediate type.
1088 addString(&Buffer, dwarf::DW_AT_name, Name);
1090 // Add size if non-zero (derived types might be zero-sized.)
1091 if (Size && Tag != dwarf::DW_TAG_pointer_type)
1092 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1094 if (Tag == dwarf::DW_TAG_ptr_to_member_type)
1095 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
1096 getOrCreateTypeDIE(resolve(DTy.getClassType())));
1097 // Add source line info if available and TyDesc is not a forward declaration.
1098 if (!DTy.isForwardDecl())
1099 addSourceLine(&Buffer, DTy);
1102 /// Return true if the type is appropriately scoped to be contained inside
1103 /// its own type unit.
1104 static bool isTypeUnitScoped(DIType Ty, const DwarfDebug *DD) {
1105 DIScope Parent = DD->resolve(Ty.getContext());
1107 // Don't generate a hash for anything scoped inside a function.
1108 if (Parent.isSubprogram())
1110 Parent = DD->resolve(Parent.getContext());
1115 /// Return true if the type should be split out into a type unit.
1116 static bool shouldCreateTypeUnit(DICompositeType CTy, const DwarfDebug *DD) {
1117 uint16_t Tag = CTy.getTag();
1120 case dwarf::DW_TAG_structure_type:
1121 case dwarf::DW_TAG_union_type:
1122 case dwarf::DW_TAG_enumeration_type:
1123 case dwarf::DW_TAG_class_type:
1124 // If this is a class, structure, union, or enumeration type
1125 // that is a definition (not a declaration), and not scoped
1126 // inside a function then separate this out as a type unit.
1127 return !CTy.isForwardDecl() && isTypeUnitScoped(CTy, DD);
1133 /// constructTypeDIE - Construct type DIE from DICompositeType.
1134 void CompileUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
1135 // Get core information.
1136 StringRef Name = CTy.getName();
1138 uint64_t Size = CTy.getSizeInBits() >> 3;
1139 uint16_t Tag = Buffer.getTag();
1142 case dwarf::DW_TAG_array_type:
1143 constructArrayTypeDIE(Buffer, CTy);
1145 case dwarf::DW_TAG_enumeration_type:
1146 constructEnumTypeDIE(Buffer, CTy);
1148 case dwarf::DW_TAG_subroutine_type: {
1149 // Add return type. A void return won't have a type.
1150 DIArray Elements = CTy.getTypeArray();
1151 DIDescriptor RTy = Elements.getElement(0);
1153 addType(&Buffer, DIType(RTy));
1155 bool isPrototyped = true;
1157 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
1158 DIDescriptor Ty = Elements.getElement(i);
1159 if (Ty.isUnspecifiedParameter()) {
1160 createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
1161 isPrototyped = false;
1163 DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
1164 addType(Arg, DIType(Ty));
1165 if (DIType(Ty).isArtificial())
1166 addFlag(Arg, dwarf::DW_AT_artificial);
1169 // Add prototype flag if we're dealing with a C language and the
1170 // function has been prototyped.
1171 uint16_t Language = DICompileUnit(Node).getLanguage();
1173 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1174 Language == dwarf::DW_LANG_ObjC))
1175 addFlag(&Buffer, dwarf::DW_AT_prototyped);
1177 case dwarf::DW_TAG_structure_type:
1178 case dwarf::DW_TAG_union_type:
1179 case dwarf::DW_TAG_class_type: {
1180 // Add elements to structure type.
1181 DIArray Elements = CTy.getTypeArray();
1182 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1183 DIDescriptor Element = Elements.getElement(i);
1184 DIE *ElemDie = NULL;
1185 if (Element.isSubprogram()) {
1186 DISubprogram SP(Element);
1187 ElemDie = getOrCreateSubprogramDIE(DISubprogram(Element));
1188 if (SP.isProtected())
1189 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1190 dwarf::DW_ACCESS_protected);
1191 else if (SP.isPrivate())
1192 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1193 dwarf::DW_ACCESS_private);
1195 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1196 dwarf::DW_ACCESS_public);
1197 if (SP.isExplicit())
1198 addFlag(ElemDie, dwarf::DW_AT_explicit);
1199 } else if (Element.isDerivedType()) {
1200 DIDerivedType DDTy(Element);
1201 if (DDTy.getTag() == dwarf::DW_TAG_friend) {
1202 ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
1203 addType(ElemDie, resolve(DDTy.getTypeDerivedFrom()),
1204 dwarf::DW_AT_friend);
1205 } else if (DDTy.isStaticMember()) {
1206 getOrCreateStaticMemberDIE(DDTy);
1208 constructMemberDIE(Buffer, DDTy);
1210 } else if (Element.isObjCProperty()) {
1211 DIObjCProperty Property(Element);
1212 ElemDie = createAndAddDIE(Property.getTag(), Buffer);
1213 StringRef PropertyName = Property.getObjCPropertyName();
1214 addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
1215 addType(ElemDie, Property.getType());
1216 addSourceLine(ElemDie, Property);
1217 StringRef GetterName = Property.getObjCPropertyGetterName();
1218 if (!GetterName.empty())
1219 addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
1220 StringRef SetterName = Property.getObjCPropertySetterName();
1221 if (!SetterName.empty())
1222 addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
1223 unsigned PropertyAttributes = 0;
1224 if (Property.isReadOnlyObjCProperty())
1225 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readonly;
1226 if (Property.isReadWriteObjCProperty())
1227 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readwrite;
1228 if (Property.isAssignObjCProperty())
1229 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_assign;
1230 if (Property.isRetainObjCProperty())
1231 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_retain;
1232 if (Property.isCopyObjCProperty())
1233 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_copy;
1234 if (Property.isNonAtomicObjCProperty())
1235 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_nonatomic;
1236 if (PropertyAttributes)
1237 addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, None,
1238 PropertyAttributes);
1240 DIEEntry *Entry = getDIEEntry(Element);
1242 Entry = createDIEEntry(ElemDie);
1243 insertDIEEntry(Element, Entry);
1249 if (CTy.isAppleBlockExtension())
1250 addFlag(&Buffer, dwarf::DW_AT_APPLE_block);
1252 DICompositeType ContainingType(resolve(CTy.getContainingType()));
1253 if (DIDescriptor(ContainingType).isCompositeType())
1254 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
1255 getOrCreateTypeDIE(DIType(ContainingType)));
1257 if (CTy.isObjcClassComplete())
1258 addFlag(&Buffer, dwarf::DW_AT_APPLE_objc_complete_type);
1260 // Add template parameters to a class, structure or union types.
1261 // FIXME: The support isn't in the metadata for this yet.
1262 if (Tag == dwarf::DW_TAG_class_type ||
1263 Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type)
1264 addTemplateParams(Buffer, CTy.getTemplateParams());
1272 // Add name if not anonymous or intermediate type.
1274 addString(&Buffer, dwarf::DW_AT_name, Name);
1276 if (Tag == dwarf::DW_TAG_enumeration_type ||
1277 Tag == dwarf::DW_TAG_class_type || Tag == dwarf::DW_TAG_structure_type ||
1278 Tag == dwarf::DW_TAG_union_type) {
1279 // Add size if non-zero (derived types might be zero-sized.)
1280 // TODO: Do we care about size for enum forward declarations?
1282 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1283 else if (!CTy.isForwardDecl())
1284 // Add zero size if it is not a forward declaration.
1285 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, 0);
1287 // If we're a forward decl, say so.
1288 if (CTy.isForwardDecl())
1289 addFlag(&Buffer, dwarf::DW_AT_declaration);
1291 // Add source line info if available.
1292 if (!CTy.isForwardDecl())
1293 addSourceLine(&Buffer, CTy);
1295 // No harm in adding the runtime language to the declaration.
1296 unsigned RLang = CTy.getRunTimeLang();
1298 addUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class, dwarf::DW_FORM_data1,
1301 // If this is a type applicable to a type unit it then add it to the
1302 // list of types we'll compute a hash for later.
1303 if (shouldCreateTypeUnit(CTy, DD))
1304 DD->addTypeUnitType(&Buffer);
1307 /// constructTemplateTypeParameterDIE - Construct new DIE for the given
1308 /// DITemplateTypeParameter.
1310 CompileUnit::constructTemplateTypeParameterDIE(DIE &Buffer,
1311 DITemplateTypeParameter TP) {
1313 createAndAddDIE(dwarf::DW_TAG_template_type_parameter, Buffer);
1314 // Add the type if it exists, it could be void and therefore no type.
1316 addType(ParamDIE, resolve(TP.getType()));
1317 if (!TP.getName().empty())
1318 addString(ParamDIE, dwarf::DW_AT_name, TP.getName());
1321 /// constructTemplateValueParameterDIE - Construct new DIE for the given
1322 /// DITemplateValueParameter.
1324 CompileUnit::constructTemplateValueParameterDIE(DIE &Buffer,
1325 DITemplateValueParameter VP) {
1326 DIE *ParamDIE = createAndAddDIE(VP.getTag(), Buffer);
1328 // Add the type if there is one, template template and template parameter
1329 // packs will not have a type.
1330 if (VP.getTag() == dwarf::DW_TAG_template_value_parameter)
1331 addType(ParamDIE, resolve(VP.getType()));
1332 if (!VP.getName().empty())
1333 addString(ParamDIE, dwarf::DW_AT_name, VP.getName());
1334 if (Value *Val = VP.getValue()) {
1335 if (ConstantInt *CI = dyn_cast<ConstantInt>(Val))
1336 addConstantValue(ParamDIE, CI,
1337 isUnsignedDIType(DD, resolve(VP.getType())));
1338 else if (GlobalValue *GV = dyn_cast<GlobalValue>(Val)) {
1339 // For declaration non-type template parameters (such as global values and
1341 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1342 addOpAddress(Block, Asm->getSymbol(GV));
1343 // Emit DW_OP_stack_value to use the address as the immediate value of the
1344 // parameter, rather than a pointer to it.
1345 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
1346 addBlock(ParamDIE, dwarf::DW_AT_location, Block);
1347 } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_template_param) {
1348 assert(isa<MDString>(Val));
1349 addString(ParamDIE, dwarf::DW_AT_GNU_template_name,
1350 cast<MDString>(Val)->getString());
1351 } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_parameter_pack) {
1352 assert(isa<MDNode>(Val));
1353 DIArray A(cast<MDNode>(Val));
1354 addTemplateParams(*ParamDIE, A);
1359 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
1360 DIE *CompileUnit::getOrCreateNameSpace(DINameSpace NS) {
1361 // Construct the context before querying for the existence of the DIE in case
1362 // such construction creates the DIE.
1363 DIE *ContextDIE = getOrCreateContextDIE(NS.getContext());
1365 DIE *NDie = getDIE(NS);
1368 NDie = createAndAddDIE(dwarf::DW_TAG_namespace, *ContextDIE, NS);
1370 if (!NS.getName().empty()) {
1371 addString(NDie, dwarf::DW_AT_name, NS.getName());
1372 addAccelNamespace(NS.getName(), NDie);
1373 addGlobalName(NS.getName(), NDie, NS.getContext());
1375 addAccelNamespace("(anonymous namespace)", NDie);
1376 addSourceLine(NDie, NS);
1380 /// getOrCreateSubprogramDIE - Create new DIE using SP.
1381 DIE *CompileUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
1382 // Construct the context before querying for the existence of the DIE in case
1383 // such construction creates the DIE (as is the case for member function
1385 DIE *ContextDIE = getOrCreateContextDIE(resolve(SP.getContext()));
1387 DIE *SPDie = getDIE(SP);
1391 DISubprogram SPDecl = SP.getFunctionDeclaration();
1392 if (SPDecl.isSubprogram())
1393 // Add subprogram definitions to the CU die directly.
1394 ContextDIE = CUDie.get();
1396 // DW_TAG_inlined_subroutine may refer to this DIE.
1397 SPDie = createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, SP);
1399 DIE *DeclDie = NULL;
1400 if (SPDecl.isSubprogram())
1401 DeclDie = getOrCreateSubprogramDIE(SPDecl);
1403 // Add function template parameters.
1404 addTemplateParams(*SPDie, SP.getTemplateParams());
1406 // If this DIE is going to refer declaration info using AT_specification
1407 // then there is no need to add other attributes.
1409 // Refer function declaration directly.
1410 addDIEEntry(SPDie, dwarf::DW_AT_specification, DeclDie);
1415 // Add the linkage name if we have one.
1416 StringRef LinkageName = SP.getLinkageName();
1417 if (!LinkageName.empty())
1418 addString(SPDie, dwarf::DW_AT_MIPS_linkage_name,
1419 GlobalValue::getRealLinkageName(LinkageName));
1421 // Constructors and operators for anonymous aggregates do not have names.
1422 if (!SP.getName().empty())
1423 addString(SPDie, dwarf::DW_AT_name, SP.getName());
1425 addSourceLine(SPDie, SP);
1427 // Add the prototype if we have a prototype and we have a C like
1429 uint16_t Language = DICompileUnit(Node).getLanguage();
1430 if (SP.isPrototyped() &&
1431 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1432 Language == dwarf::DW_LANG_ObjC))
1433 addFlag(SPDie, dwarf::DW_AT_prototyped);
1435 DICompositeType SPTy = SP.getType();
1436 assert(SPTy.getTag() == dwarf::DW_TAG_subroutine_type &&
1437 "the type of a subprogram should be a subroutine");
1439 DIArray Args = SPTy.getTypeArray();
1440 // Add a return type. If this is a type like a C/C++ void type we don't add a
1442 if (Args.getElement(0))
1443 addType(SPDie, DIType(Args.getElement(0)));
1445 unsigned VK = SP.getVirtuality();
1447 addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
1448 DIEBlock *Block = getDIEBlock();
1449 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1450 addUInt(Block, dwarf::DW_FORM_udata, SP.getVirtualIndex());
1451 addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, Block);
1452 ContainingTypeMap.insert(
1453 std::make_pair(SPDie, resolve(SP.getContainingType())));
1456 if (!SP.isDefinition()) {
1457 addFlag(SPDie, dwarf::DW_AT_declaration);
1459 // Add arguments. Do not add arguments for subprogram definition. They will
1460 // be handled while processing variables.
1461 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
1462 DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, *SPDie);
1463 DIType ATy = DIType(Args.getElement(i));
1465 if (ATy.isArtificial())
1466 addFlag(Arg, dwarf::DW_AT_artificial);
1470 if (SP.isArtificial())
1471 addFlag(SPDie, dwarf::DW_AT_artificial);
1473 if (!SP.isLocalToUnit())
1474 addFlag(SPDie, dwarf::DW_AT_external);
1476 if (SP.isOptimized())
1477 addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);
1479 if (unsigned isa = Asm->getISAEncoding()) {
1480 addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
1486 // Return const expression if value is a GEP to access merged global
1488 // i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
1489 static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
1490 const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
1491 if (!CE || CE->getNumOperands() != 3 ||
1492 CE->getOpcode() != Instruction::GetElementPtr)
1495 // First operand points to a global struct.
1496 Value *Ptr = CE->getOperand(0);
1497 if (!isa<GlobalValue>(Ptr) ||
1498 !isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
1501 // Second operand is zero.
1502 const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
1503 if (!CI || !CI->isZero())
1506 // Third operand is offset.
1507 if (!isa<ConstantInt>(CE->getOperand(2)))
1513 /// createGlobalVariableDIE - create global variable DIE.
1514 void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
1515 // Check for pre-existence.
1519 DIGlobalVariable GV(N);
1520 if (!GV.isGlobalVariable())
1523 DIScope GVContext = GV.getContext();
1524 DIType GTy = GV.getType();
1526 // If this is a static data member definition, some attributes belong
1527 // to the declaration DIE.
1528 DIE *VariableDIE = NULL;
1529 bool IsStaticMember = false;
1530 DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration();
1531 if (SDMDecl.Verify()) {
1532 assert(SDMDecl.isStaticMember() && "Expected static member decl");
1533 // We need the declaration DIE that is in the static member's class.
1534 VariableDIE = getOrCreateStaticMemberDIE(SDMDecl);
1535 IsStaticMember = true;
1538 // If this is not a static data member definition, create the variable
1539 // DIE and add the initial set of attributes to it.
1541 // Construct the context before querying for the existence of the DIE in
1542 // case such construction creates the DIE.
1543 DIE *ContextDIE = getOrCreateContextDIE(GVContext);
1546 VariableDIE = createAndAddDIE(GV.getTag(), *ContextDIE, N);
1548 // Add name and type.
1549 addString(VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
1550 addType(VariableDIE, GTy);
1552 // Add scoping info.
1553 if (!GV.isLocalToUnit())
1554 addFlag(VariableDIE, dwarf::DW_AT_external);
1556 // Add line number info.
1557 addSourceLine(VariableDIE, GV);
1561 bool addToAccelTable = false;
1562 DIE *VariableSpecDIE = NULL;
1563 bool isGlobalVariable = GV.getGlobal() != NULL;
1564 if (isGlobalVariable) {
1565 addToAccelTable = true;
1566 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1567 const MCSymbol *Sym = Asm->getSymbol(GV.getGlobal());
1568 if (GV.getGlobal()->isThreadLocal()) {
1569 // FIXME: Make this work with -gsplit-dwarf.
1570 unsigned PointerSize = Asm->getDataLayout().getPointerSize();
1571 assert((PointerSize == 4 || PointerSize == 8) &&
1572 "Add support for other sizes if necessary");
1573 const MCExpr *Expr =
1574 Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym);
1575 // Based on GCC's support for TLS:
1576 if (!DD->useSplitDwarf()) {
1577 // 1) Start with a constNu of the appropriate pointer size
1578 addUInt(Block, dwarf::DW_FORM_data1,
1579 PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
1580 // 2) containing the (relocated) offset of the TLS variable
1581 // within the module's TLS block.
1582 addExpr(Block, dwarf::DW_FORM_udata, Expr);
1584 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
1585 addUInt(Block, dwarf::DW_FORM_udata, DU->getAddrPoolIndex(Expr));
1587 // 3) followed by a custom OP to make the debugger do a TLS lookup.
1588 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
1590 addOpAddress(Block, Sym);
1591 // Do not create specification DIE if context is either compile unit
1593 if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
1594 !GVContext.isFile() && !DD->isSubprogramContext(GVContext)) {
1595 // Create specification DIE.
1596 VariableSpecDIE = createAndAddDIE(dwarf::DW_TAG_variable, *CUDie.get());
1597 addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification, VariableDIE);
1598 addBlock(VariableSpecDIE, dwarf::DW_AT_location, Block);
1599 // A static member's declaration is already flagged as such.
1600 if (!SDMDecl.Verify())
1601 addFlag(VariableDIE, dwarf::DW_AT_declaration);
1603 addBlock(VariableDIE, dwarf::DW_AT_location, Block);
1605 // Add the linkage name.
1606 StringRef LinkageName = GV.getLinkageName();
1607 if (!LinkageName.empty())
1608 // From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
1609 // TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
1611 addString(IsStaticMember && VariableSpecDIE ? VariableSpecDIE
1613 dwarf::DW_AT_MIPS_linkage_name,
1614 GlobalValue::getRealLinkageName(LinkageName));
1615 } else if (const ConstantInt *CI =
1616 dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
1617 // AT_const_value was added when the static member was created. To avoid
1618 // emitting AT_const_value multiple times, we only add AT_const_value when
1619 // it is not a static member.
1620 if (!IsStaticMember)
1621 addConstantValue(VariableDIE, CI, isUnsignedDIType(DD, GTy));
1622 } else if (const ConstantExpr *CE = getMergedGlobalExpr(N->getOperand(11))) {
1623 addToAccelTable = true;
1624 // GV is a merged global.
1625 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1626 Value *Ptr = CE->getOperand(0);
1627 addOpAddress(Block, Asm->getSymbol(cast<GlobalValue>(Ptr)));
1628 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1629 SmallVector<Value *, 3> Idx(CE->op_begin() + 1, CE->op_end());
1630 addUInt(Block, dwarf::DW_FORM_udata,
1631 Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx));
1632 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1633 addBlock(VariableDIE, dwarf::DW_AT_location, Block);
1636 if (addToAccelTable) {
1637 DIE *AddrDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
1638 addAccelName(GV.getName(), AddrDIE);
1640 // If the linkage name is different than the name, go ahead and output
1641 // that as well into the name table.
1642 if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
1643 addAccelName(GV.getLinkageName(), AddrDIE);
1646 if (!GV.isLocalToUnit())
1647 addGlobalName(GV.getName(), VariableSpecDIE ? VariableSpecDIE : VariableDIE,
1651 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
1652 void CompileUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR,
1654 DIE *DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
1655 addDIEEntry(DW_Subrange, dwarf::DW_AT_type, IndexTy);
1657 // The LowerBound value defines the lower bounds which is typically zero for
1658 // C/C++. The Count value is the number of elements. Values are 64 bit. If
1659 // Count == -1 then the array is unbounded and we do not emit
1660 // DW_AT_lower_bound and DW_AT_upper_bound attributes. If LowerBound == 0 and
1661 // Count == 0, then the array has zero elements in which case we do not emit
1663 int64_t LowerBound = SR.getLo();
1664 int64_t DefaultLowerBound = getDefaultLowerBound();
1665 int64_t Count = SR.getCount();
1667 if (DefaultLowerBound == -1 || LowerBound != DefaultLowerBound)
1668 addUInt(DW_Subrange, dwarf::DW_AT_lower_bound, None, LowerBound);
1670 if (Count != -1 && Count != 0)
1671 // FIXME: An unbounded array should reference the expression that defines
1673 addUInt(DW_Subrange, dwarf::DW_AT_upper_bound, None,
1674 LowerBound + Count - 1);
1677 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
1678 void CompileUnit::constructArrayTypeDIE(DIE &Buffer, DICompositeType CTy) {
1680 addFlag(&Buffer, dwarf::DW_AT_GNU_vector);
1682 // Emit the element type.
1683 addType(&Buffer, resolve(CTy.getTypeDerivedFrom()));
1685 // Get an anonymous type for index type.
1686 // FIXME: This type should be passed down from the front end
1687 // as different languages may have different sizes for indexes.
1688 DIE *IdxTy = getIndexTyDie();
1690 // Construct an anonymous type for index type.
1691 IdxTy = createAndAddDIE(dwarf::DW_TAG_base_type, *CUDie.get());
1692 addString(IdxTy, dwarf::DW_AT_name, "int");
1693 addUInt(IdxTy, dwarf::DW_AT_byte_size, None, sizeof(int32_t));
1694 addUInt(IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1695 dwarf::DW_ATE_signed);
1696 setIndexTyDie(IdxTy);
1699 // Add subranges to array type.
1700 DIArray Elements = CTy.getTypeArray();
1701 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1702 DIDescriptor Element = Elements.getElement(i);
1703 if (Element.getTag() == dwarf::DW_TAG_subrange_type)
1704 constructSubrangeDIE(Buffer, DISubrange(Element), IdxTy);
1708 /// constructEnumTypeDIE - Construct an enum type DIE from DICompositeType.
1709 void CompileUnit::constructEnumTypeDIE(DIE &Buffer, DICompositeType CTy) {
1710 DIArray Elements = CTy.getTypeArray();
1712 // Add enumerators to enumeration type.
1713 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1714 DIDescriptor Enum(Elements.getElement(i));
1715 DIEnumerator ETy = DIEnumerator(Enum);
1716 if (Enum.isEnumerator()) {
1717 DIE *Enumerator = createAndAddDIE(dwarf::DW_TAG_enumerator, Buffer);
1718 StringRef Name = ETy.getName();
1719 addString(Enumerator, dwarf::DW_AT_name, Name);
1720 int64_t Value = ETy.getEnumValue();
1721 addSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, Value);
1724 DIType DTy = resolve(CTy.getTypeDerivedFrom());
1726 addType(&Buffer, DTy);
1727 addFlag(&Buffer, dwarf::DW_AT_enum_class);
1731 /// constructContainingTypeDIEs - Construct DIEs for types that contain
1733 void CompileUnit::constructContainingTypeDIEs() {
1734 for (DenseMap<DIE *, const MDNode *>::iterator CI = ContainingTypeMap.begin(),
1735 CE = ContainingTypeMap.end();
1737 DIE *SPDie = CI->first;
1738 const MDNode *N = CI->second;
1741 DIE *NDie = getDIE(N);
1744 addDIEEntry(SPDie, dwarf::DW_AT_containing_type, NDie);
1748 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
1749 DIE *CompileUnit::constructVariableDIE(DbgVariable &DV, bool isScopeAbstract) {
1750 StringRef Name = DV.getName();
1752 // Define variable debug information entry.
1753 DIE *VariableDie = new DIE(DV.getTag());
1754 DbgVariable *AbsVar = DV.getAbstractVariable();
1755 DIE *AbsDIE = AbsVar ? AbsVar->getDIE() : NULL;
1757 addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin, AbsDIE);
1760 addString(VariableDie, dwarf::DW_AT_name, Name);
1761 addSourceLine(VariableDie, DV.getVariable());
1762 addType(VariableDie, DV.getType());
1765 if (DV.isArtificial())
1766 addFlag(VariableDie, dwarf::DW_AT_artificial);
1768 if (isScopeAbstract) {
1769 DV.setDIE(VariableDie);
1773 // Add variable address.
1775 unsigned Offset = DV.getDotDebugLocOffset();
1776 if (Offset != ~0U) {
1777 addLabel(VariableDie, dwarf::DW_AT_location, 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(const 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());