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"
32 #include "llvm/Support/CommandLine.h"
36 static cl::opt<bool> GenerateTypeUnits("generate-type-units", cl::Hidden,
37 cl::desc("Generate DWARF4 type units."),
40 /// CompileUnit - Compile unit constructor.
41 CompileUnit::CompileUnit(unsigned UID, DIE *D, DICompileUnit Node,
42 AsmPrinter *A, DwarfDebug *DW, DwarfUnits *DWU)
43 : UniqueID(UID), Node(Node), Language(Node.getLanguage()), CUDie(D),
44 DebugInfoOffset(0), Asm(A), DD(DW), DU(DWU), IndexTyDie(0) {
45 DIEIntegerOne = new (DIEValueAllocator) DIEInteger(1);
49 CompileUnit::CompileUnit(unsigned UID, DIE *D, uint16_t Language, AsmPrinter *A,
50 DwarfDebug *DD, DwarfUnits *DU)
51 : UniqueID(UID), Node(NULL), Language(Language), CUDie(D),
52 DebugInfoOffset(0), Asm(A), DD(DD), DU(DU), IndexTyDie(0) {
53 DIEIntegerOne = new (DIEValueAllocator) DIEInteger(1);
56 /// ~CompileUnit - Destructor for compile unit.
57 CompileUnit::~CompileUnit() {
58 for (unsigned j = 0, M = DIEBlocks.size(); j < M; ++j)
59 DIEBlocks[j]->~DIEBlock();
62 /// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
63 /// information entry.
64 DIEEntry *CompileUnit::createDIEEntry(DIE *Entry) {
65 DIEEntry *Value = new (DIEValueAllocator) DIEEntry(Entry);
69 /// getDefaultLowerBound - Return the default lower bound for an array. If the
70 /// DWARF version doesn't handle the language, return -1.
71 int64_t CompileUnit::getDefaultLowerBound() const {
72 switch (getLanguage()) {
76 case dwarf::DW_LANG_C89:
77 case dwarf::DW_LANG_C99:
78 case dwarf::DW_LANG_C:
79 case dwarf::DW_LANG_C_plus_plus:
80 case dwarf::DW_LANG_ObjC:
81 case dwarf::DW_LANG_ObjC_plus_plus:
84 case dwarf::DW_LANG_Fortran77:
85 case dwarf::DW_LANG_Fortran90:
86 case dwarf::DW_LANG_Fortran95:
89 // The languages below have valid values only if the DWARF version >= 4.
90 case dwarf::DW_LANG_Java:
91 case dwarf::DW_LANG_Python:
92 case dwarf::DW_LANG_UPC:
93 case dwarf::DW_LANG_D:
94 if (dwarf::DWARF_VERSION >= 4)
98 case dwarf::DW_LANG_Ada83:
99 case dwarf::DW_LANG_Ada95:
100 case dwarf::DW_LANG_Cobol74:
101 case dwarf::DW_LANG_Cobol85:
102 case dwarf::DW_LANG_Modula2:
103 case dwarf::DW_LANG_Pascal83:
104 case dwarf::DW_LANG_PLI:
105 if (dwarf::DWARF_VERSION >= 4)
113 /// Check whether the DIE for this MDNode can be shared across CUs.
114 static bool isShareableAcrossCUs(DIDescriptor D) {
115 // When the MDNode can be part of the type system, the DIE can be shared
117 // Combining type units and cross-CU DIE sharing is lower value (since
118 // cross-CU DIE sharing is used in LTO and removes type redundancy at that
119 // level already) but may be implementable for some value in projects
120 // building multiple independent libraries with LTO and then linking those
122 return (D.isType() ||
123 (D.isSubprogram() && !DISubprogram(D).isDefinition())) &&
127 /// getDIE - Returns the debug information entry map slot for the
128 /// specified debug variable. We delegate the request to DwarfDebug
129 /// when the DIE for this MDNode can be shared across CUs. The mappings
130 /// will be kept in DwarfDebug for shareable DIEs.
131 DIE *CompileUnit::getDIE(DIDescriptor D) const {
132 if (isShareableAcrossCUs(D))
133 return DD->getDIE(D);
134 return MDNodeToDieMap.lookup(D);
137 /// insertDIE - Insert DIE into the map. We delegate the request to DwarfDebug
138 /// when the DIE for this MDNode can be shared across CUs. The mappings
139 /// will be kept in DwarfDebug for shareable DIEs.
140 void CompileUnit::insertDIE(DIDescriptor Desc, DIE *D) {
141 if (isShareableAcrossCUs(Desc)) {
142 DD->insertDIE(Desc, D);
145 MDNodeToDieMap.insert(std::make_pair(Desc, D));
148 /// addFlag - Add a flag that is true.
149 void CompileUnit::addFlag(DIE *Die, dwarf::Attribute Attribute) {
150 if (DD->getDwarfVersion() >= 4)
151 Die->addValue(Attribute, dwarf::DW_FORM_flag_present, DIEIntegerOne);
153 Die->addValue(Attribute, dwarf::DW_FORM_flag, DIEIntegerOne);
156 /// addUInt - Add an unsigned integer attribute data and value.
158 void CompileUnit::addUInt(DIE *Die, dwarf::Attribute Attribute,
159 Optional<dwarf::Form> Form, uint64_t Integer) {
161 Form = DIEInteger::BestForm(false, Integer);
162 DIEValue *Value = Integer == 1 ? DIEIntegerOne : new (DIEValueAllocator)
164 Die->addValue(Attribute, *Form, Value);
167 void CompileUnit::addUInt(DIEBlock *Block, dwarf::Form Form, uint64_t Integer) {
168 addUInt(Block, (dwarf::Attribute)0, Form, Integer);
171 /// addSInt - Add an signed integer attribute data and value.
173 void CompileUnit::addSInt(DIE *Die, dwarf::Attribute Attribute,
174 Optional<dwarf::Form> Form, int64_t Integer) {
176 Form = DIEInteger::BestForm(true, Integer);
177 DIEValue *Value = new (DIEValueAllocator) DIEInteger(Integer);
178 Die->addValue(Attribute, *Form, Value);
181 void CompileUnit::addSInt(DIEBlock *Die, Optional<dwarf::Form> Form,
183 addSInt(Die, (dwarf::Attribute)0, Form, Integer);
186 /// addString - Add a string attribute data and value. We always emit a
187 /// reference to the string pool instead of immediate strings so that DIEs have
188 /// more predictable sizes. In the case of split dwarf we emit an index
189 /// into another table which gets us the static offset into the string
191 void CompileUnit::addString(DIE *Die, dwarf::Attribute Attribute,
195 if (!DD->useSplitDwarf()) {
196 MCSymbol *Symb = DU->getStringPoolEntry(String);
197 if (Asm->needsRelocationsForDwarfStringPool())
198 Value = new (DIEValueAllocator) DIELabel(Symb);
200 MCSymbol *StringPool = DU->getStringPoolSym();
201 Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool);
203 Form = dwarf::DW_FORM_strp;
205 unsigned idx = DU->getStringPoolIndex(String);
206 Value = new (DIEValueAllocator) DIEInteger(idx);
207 Form = dwarf::DW_FORM_GNU_str_index;
209 DIEValue *Str = new (DIEValueAllocator) DIEString(Value, String);
210 Die->addValue(Attribute, Form, Str);
213 /// addLocalString - Add a string attribute data and value. This is guaranteed
214 /// to be in the local string pool instead of indirected.
215 void CompileUnit::addLocalString(DIE *Die, dwarf::Attribute Attribute,
217 MCSymbol *Symb = DU->getStringPoolEntry(String);
219 if (Asm->needsRelocationsForDwarfStringPool())
220 Value = new (DIEValueAllocator) DIELabel(Symb);
222 MCSymbol *StringPool = DU->getStringPoolSym();
223 Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool);
225 Die->addValue(Attribute, dwarf::DW_FORM_strp, Value);
228 /// addExpr - Add a Dwarf expression attribute data and value.
230 void CompileUnit::addExpr(DIEBlock *Die, dwarf::Form Form, const MCExpr *Expr) {
231 DIEValue *Value = new (DIEValueAllocator) DIEExpr(Expr);
232 Die->addValue((dwarf::Attribute)0, Form, Value);
235 /// addLabel - Add a Dwarf label attribute data and value.
237 void CompileUnit::addLabel(DIE *Die, dwarf::Attribute Attribute,
238 dwarf::Form Form, const MCSymbol *Label) {
239 DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
240 Die->addValue(Attribute, Form, Value);
243 void CompileUnit::addLabel(DIEBlock *Die, dwarf::Form Form,
244 const MCSymbol *Label) {
245 addLabel(Die, (dwarf::Attribute)0, Form, Label);
248 /// addSectionLabel - Add a Dwarf section label attribute data and value.
250 void CompileUnit::addSectionLabel(DIE *Die, dwarf::Attribute Attribute,
251 const MCSymbol *Label) {
252 if (DD->getDwarfVersion() >= 4)
253 addLabel(Die, Attribute, dwarf::DW_FORM_sec_offset, Label);
255 addLabel(Die, Attribute, dwarf::DW_FORM_data4, Label);
258 /// addSectionOffset - Add an offset into a section attribute data and value.
260 void CompileUnit::addSectionOffset(DIE *Die, dwarf::Attribute Attribute,
262 if (DD->getDwarfVersion() >= 4)
263 addUInt(Die, Attribute, dwarf::DW_FORM_sec_offset, Integer);
265 addUInt(Die, Attribute, dwarf::DW_FORM_data4, Integer);
268 /// addLabelAddress - Add a dwarf label attribute data and value using
269 /// DW_FORM_addr or DW_FORM_GNU_addr_index.
271 void CompileUnit::addLabelAddress(DIE *Die, dwarf::Attribute Attribute,
274 DD->addArangeLabel(SymbolCU(this, Label));
276 if (!DD->useSplitDwarf()) {
278 DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
279 Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
281 DIEValue *Value = new (DIEValueAllocator) DIEInteger(0);
282 Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
285 unsigned idx = DU->getAddrPoolIndex(Label);
286 DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
287 Die->addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, Value);
291 /// addOpAddress - Add a dwarf op address data and value using the
292 /// form given and an op of either DW_FORM_addr or DW_FORM_GNU_addr_index.
294 void CompileUnit::addOpAddress(DIEBlock *Die, const MCSymbol *Sym) {
295 DD->addArangeLabel(SymbolCU(this, Sym));
296 if (!DD->useSplitDwarf()) {
297 addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
298 addLabel(Die, dwarf::DW_FORM_udata, Sym);
300 addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_addr_index);
301 addUInt(Die, dwarf::DW_FORM_GNU_addr_index, DU->getAddrPoolIndex(Sym));
305 /// addSectionDelta - Add a section label delta attribute data and value.
307 void CompileUnit::addSectionDelta(DIE *Die, dwarf::Attribute Attribute,
308 const MCSymbol *Hi, const MCSymbol *Lo) {
309 DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo);
310 if (DD->getDwarfVersion() >= 4)
311 Die->addValue(Attribute, dwarf::DW_FORM_sec_offset, Value);
313 Die->addValue(Attribute, dwarf::DW_FORM_data4, Value);
316 /// addDIEEntry - Add a DIE attribute data and value.
318 void CompileUnit::addDIEEntry(DIE *Die, dwarf::Attribute Attribute,
320 addDIEEntry(Die, Attribute, createDIEEntry(Entry));
323 void CompileUnit::addDIEEntry(DIE *Die, dwarf::Attribute Attribute,
325 const DIE *DieCU = Die->getUnitOrNull();
326 const DIE *EntryCU = Entry->getEntry()->getUnitOrNull();
328 // We assume that Die belongs to this CU, if it is not linked to any CU yet.
331 EntryCU = getCUDie();
332 Die->addValue(Attribute, EntryCU == DieCU ? dwarf::DW_FORM_ref4
333 : dwarf::DW_FORM_ref_addr,
337 /// Create a DIE with the given Tag, add the DIE to its parent, and
338 /// call insertDIE if MD is not null.
339 DIE *CompileUnit::createAndAddDIE(unsigned Tag, DIE &Parent, DIDescriptor N) {
340 DIE *Die = new DIE(Tag);
341 Parent.addChild(Die);
347 /// addBlock - Add block data.
349 void CompileUnit::addBlock(DIE *Die, dwarf::Attribute Attribute,
351 Block->ComputeSize(Asm);
352 DIEBlocks.push_back(Block); // Memoize so we can call the destructor later on.
353 Die->addValue(Attribute, Block->BestForm(), Block);
356 /// addSourceLine - Add location information to specified debug information
358 void CompileUnit::addSourceLine(DIE *Die, DIVariable V) {
363 unsigned Line = V.getLineNumber();
367 DD->getOrCreateSourceID(V.getContext().getFilename(),
368 V.getContext().getDirectory(), getUniqueID());
369 assert(FileID && "Invalid file id");
370 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
371 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
374 /// addSourceLine - Add location information to specified debug information
376 void CompileUnit::addSourceLine(DIE *Die, DIGlobalVariable G) {
377 // Verify global variable.
378 if (!G.isGlobalVariable())
381 unsigned Line = G.getLineNumber();
385 DD->getOrCreateSourceID(G.getFilename(), G.getDirectory(), getUniqueID());
386 assert(FileID && "Invalid file id");
387 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
388 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
391 /// addSourceLine - Add location information to specified debug information
393 void CompileUnit::addSourceLine(DIE *Die, DISubprogram SP) {
394 // Verify subprogram.
395 if (!SP.isSubprogram())
398 // If the line number is 0, don't add it.
399 unsigned Line = SP.getLineNumber();
403 unsigned FileID = DD->getOrCreateSourceID(SP.getFilename(), SP.getDirectory(),
405 assert(FileID && "Invalid file id");
406 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
407 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
410 /// addSourceLine - Add location information to specified debug information
412 void CompileUnit::addSourceLine(DIE *Die, DIType Ty) {
417 unsigned Line = Ty.getLineNumber();
420 unsigned FileID = DD->getOrCreateSourceID(Ty.getFilename(), Ty.getDirectory(),
422 assert(FileID && "Invalid file id");
423 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
424 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
427 /// addSourceLine - Add location information to specified debug information
429 void CompileUnit::addSourceLine(DIE *Die, DIObjCProperty Ty) {
431 if (!Ty.isObjCProperty())
434 unsigned Line = Ty.getLineNumber();
437 DIFile File = Ty.getFile();
438 unsigned FileID = DD->getOrCreateSourceID(File.getFilename(),
439 File.getDirectory(), getUniqueID());
440 assert(FileID && "Invalid file id");
441 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
442 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
445 /// addSourceLine - Add location information to specified debug information
447 void CompileUnit::addSourceLine(DIE *Die, DINameSpace NS) {
452 unsigned Line = NS.getLineNumber();
455 StringRef FN = NS.getFilename();
458 DD->getOrCreateSourceID(FN, NS.getDirectory(), getUniqueID());
459 assert(FileID && "Invalid file id");
460 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
461 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
464 /// addVariableAddress - Add DW_AT_location attribute for a
465 /// DbgVariable based on provided MachineLocation.
466 void CompileUnit::addVariableAddress(const DbgVariable &DV, DIE *Die,
467 MachineLocation Location) {
468 if (DV.variableHasComplexAddress())
469 addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
470 else if (DV.isBlockByrefVariable())
471 addBlockByrefAddress(DV, Die, dwarf::DW_AT_location, Location);
473 addAddress(Die, dwarf::DW_AT_location, Location,
474 DV.getVariable().isIndirect());
477 /// addRegisterOp - Add register operand.
478 void CompileUnit::addRegisterOp(DIEBlock *TheDie, unsigned Reg) {
479 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
480 unsigned DWReg = RI->getDwarfRegNum(Reg, false);
482 addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + DWReg);
484 addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_regx);
485 addUInt(TheDie, dwarf::DW_FORM_udata, DWReg);
489 /// addRegisterOffset - Add register offset.
490 void CompileUnit::addRegisterOffset(DIEBlock *TheDie, unsigned Reg,
492 const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
493 unsigned DWReg = RI->getDwarfRegNum(Reg, false);
494 const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
495 if (Reg == TRI->getFrameRegister(*Asm->MF))
496 // If variable offset is based in frame register then use fbreg.
497 addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_fbreg);
499 addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + DWReg);
501 addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
502 addUInt(TheDie, dwarf::DW_FORM_udata, DWReg);
504 addSInt(TheDie, dwarf::DW_FORM_sdata, Offset);
507 /// addAddress - Add an address attribute to a die based on the location
509 void CompileUnit::addAddress(DIE *Die, dwarf::Attribute Attribute,
510 const MachineLocation &Location, bool Indirect) {
511 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
513 if (Location.isReg() && !Indirect)
514 addRegisterOp(Block, Location.getReg());
516 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
517 if (Indirect && !Location.isReg()) {
518 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
522 // Now attach the location information to the DIE.
523 addBlock(Die, Attribute, Block);
526 /// addComplexAddress - Start with the address based on the location provided,
527 /// and generate the DWARF information necessary to find the actual variable
528 /// given the extra address information encoded in the DIVariable, starting from
529 /// the starting location. Add the DWARF information to the die.
531 void CompileUnit::addComplexAddress(const DbgVariable &DV, DIE *Die,
532 dwarf::Attribute Attribute,
533 const MachineLocation &Location) {
534 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
535 unsigned N = DV.getNumAddrElements();
537 if (Location.isReg()) {
538 if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
539 // If first address element is OpPlus then emit
540 // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
541 addRegisterOffset(Block, Location.getReg(), DV.getAddrElement(1));
544 addRegisterOp(Block, Location.getReg());
546 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
549 uint64_t Element = DV.getAddrElement(i);
550 if (Element == DIBuilder::OpPlus) {
551 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
552 addUInt(Block, dwarf::DW_FORM_udata, DV.getAddrElement(++i));
553 } else if (Element == DIBuilder::OpDeref) {
554 if (!Location.isReg())
555 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
557 llvm_unreachable("unknown DIBuilder Opcode");
560 // Now attach the location information to the DIE.
561 addBlock(Die, Attribute, Block);
564 /* Byref variables, in Blocks, are declared by the programmer as "SomeType
565 VarName;", but the compiler creates a __Block_byref_x_VarName struct, and
566 gives the variable VarName either the struct, or a pointer to the struct, as
567 its type. This is necessary for various behind-the-scenes things the
568 compiler needs to do with by-reference variables in Blocks.
570 However, as far as the original *programmer* is concerned, the variable
571 should still have type 'SomeType', as originally declared.
573 The function getBlockByrefType dives into the __Block_byref_x_VarName
574 struct to find the original type of the variable, which is then assigned to
575 the variable's Debug Information Entry as its real type. So far, so good.
576 However now the debugger will expect the variable VarName to have the type
577 SomeType. So we need the location attribute for the variable to be an
578 expression that explains to the debugger how to navigate through the
579 pointers and struct to find the actual variable of type SomeType.
581 The following function does just that. We start by getting
582 the "normal" location for the variable. This will be the location
583 of either the struct __Block_byref_x_VarName or the pointer to the
584 struct __Block_byref_x_VarName.
586 The struct will look something like:
588 struct __Block_byref_x_VarName {
590 struct __Block_byref_x_VarName *forwarding;
591 ... <various other fields>
593 ... <maybe more fields>
596 If we are given the struct directly (as our starting point) we
597 need to tell the debugger to:
599 1). Add the offset of the forwarding field.
601 2). Follow that pointer to get the real __Block_byref_x_VarName
602 struct to use (the real one may have been copied onto the heap).
604 3). Add the offset for the field VarName, to find the actual variable.
606 If we started with a pointer to the struct, then we need to
607 dereference that pointer first, before the other steps.
608 Translating this into DWARF ops, we will need to append the following
609 to the current location description for the variable:
611 DW_OP_deref -- optional, if we start with a pointer
612 DW_OP_plus_uconst <forward_fld_offset>
614 DW_OP_plus_uconst <varName_fld_offset>
616 That is what this function does. */
618 /// addBlockByrefAddress - Start with the address based on the location
619 /// provided, and generate the DWARF information necessary to find the
620 /// actual Block variable (navigating the Block struct) based on the
621 /// starting location. Add the DWARF information to the die. For
622 /// more information, read large comment just above here.
624 void CompileUnit::addBlockByrefAddress(const DbgVariable &DV, DIE *Die,
625 dwarf::Attribute Attribute,
626 const MachineLocation &Location) {
627 DIType Ty = DV.getType();
629 uint16_t Tag = Ty.getTag();
630 bool isPointer = false;
632 StringRef varName = DV.getName();
634 if (Tag == dwarf::DW_TAG_pointer_type) {
635 DIDerivedType DTy(Ty);
636 TmpTy = resolve(DTy.getTypeDerivedFrom());
640 DICompositeType blockStruct(TmpTy);
642 // Find the __forwarding field and the variable field in the __Block_byref
644 DIArray Fields = blockStruct.getTypeArray();
645 DIDerivedType varField;
646 DIDerivedType forwardingField;
648 for (unsigned i = 0, N = Fields.getNumElements(); i < N; ++i) {
649 DIDerivedType DT(Fields.getElement(i));
650 StringRef fieldName = DT.getName();
651 if (fieldName == "__forwarding")
652 forwardingField = DT;
653 else if (fieldName == varName)
657 // Get the offsets for the forwarding field and the variable field.
658 unsigned forwardingFieldOffset = forwardingField.getOffsetInBits() >> 3;
659 unsigned varFieldOffset = varField.getOffsetInBits() >> 2;
661 // Decode the original location, and use that as the start of the byref
662 // variable's location.
663 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
665 if (Location.isReg())
666 addRegisterOp(Block, Location.getReg());
668 addRegisterOffset(Block, Location.getReg(), Location.getOffset());
670 // If we started with a pointer to the __Block_byref... struct, then
671 // the first thing we need to do is dereference the pointer (DW_OP_deref).
673 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
675 // Next add the offset for the '__forwarding' field:
676 // DW_OP_plus_uconst ForwardingFieldOffset. Note there's no point in
677 // adding the offset if it's 0.
678 if (forwardingFieldOffset > 0) {
679 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
680 addUInt(Block, dwarf::DW_FORM_udata, forwardingFieldOffset);
683 // Now dereference the __forwarding field to get to the real __Block_byref
684 // struct: DW_OP_deref.
685 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
687 // Now that we've got the real __Block_byref... struct, add the offset
688 // for the variable's field to get to the location of the actual variable:
689 // DW_OP_plus_uconst varFieldOffset. Again, don't add if it's 0.
690 if (varFieldOffset > 0) {
691 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
692 addUInt(Block, dwarf::DW_FORM_udata, varFieldOffset);
695 // Now attach the location information to the DIE.
696 addBlock(Die, Attribute, Block);
699 /// isTypeSigned - Return true if the type is signed.
700 static bool isTypeSigned(DwarfDebug *DD, DIType Ty, int *SizeInBits) {
701 if (Ty.isDerivedType())
702 return isTypeSigned(DD, DD->resolve(DIDerivedType(Ty).getTypeDerivedFrom()),
704 if (Ty.isBasicType())
705 if (DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed ||
706 DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed_char) {
707 *SizeInBits = Ty.getSizeInBits();
713 /// Return true if type encoding is unsigned.
714 static bool isUnsignedDIType(DwarfDebug *DD, DIType Ty) {
715 DIDerivedType DTy(Ty);
716 if (DTy.isDerivedType())
717 return isUnsignedDIType(DD, DD->resolve(DTy.getTypeDerivedFrom()));
720 if (BTy.isBasicType()) {
721 unsigned Encoding = BTy.getEncoding();
722 if (Encoding == dwarf::DW_ATE_unsigned ||
723 Encoding == dwarf::DW_ATE_unsigned_char ||
724 Encoding == dwarf::DW_ATE_boolean)
730 /// If this type is derived from a base type then return base type size.
731 static uint64_t getBaseTypeSize(DwarfDebug *DD, DIDerivedType Ty) {
732 unsigned Tag = Ty.getTag();
734 if (Tag != dwarf::DW_TAG_member && Tag != dwarf::DW_TAG_typedef &&
735 Tag != dwarf::DW_TAG_const_type && Tag != dwarf::DW_TAG_volatile_type &&
736 Tag != dwarf::DW_TAG_restrict_type)
737 return Ty.getSizeInBits();
739 DIType BaseType = DD->resolve(Ty.getTypeDerivedFrom());
741 // If this type is not derived from any type then take conservative approach.
742 if (!BaseType.isValid())
743 return Ty.getSizeInBits();
745 // If this is a derived type, go ahead and get the base type, unless it's a
746 // reference then it's just the size of the field. Pointer types have no need
747 // of this since they're a different type of qualification on the type.
748 if (BaseType.getTag() == dwarf::DW_TAG_reference_type ||
749 BaseType.getTag() == dwarf::DW_TAG_rvalue_reference_type)
750 return Ty.getSizeInBits();
752 if (BaseType.isDerivedType())
753 return getBaseTypeSize(DD, DIDerivedType(BaseType));
755 return BaseType.getSizeInBits();
758 /// addConstantValue - Add constant value entry in variable DIE.
759 void CompileUnit::addConstantValue(DIE *Die, const MachineOperand &MO,
761 // FIXME: This is a bit conservative/simple - it emits negative values at
762 // their maximum bit width which is a bit unfortunate (& doesn't prefer
763 // udata/sdata over dataN as suggested by the DWARF spec)
764 assert(MO.isImm() && "Invalid machine operand!");
766 bool SignedConstant = isTypeSigned(DD, Ty, &SizeInBits);
769 // If we're a signed constant definitely use sdata.
770 if (SignedConstant) {
771 addSInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, MO.getImm());
775 // Else use data for now unless it's larger than we can deal with.
776 switch (SizeInBits) {
778 Form = dwarf::DW_FORM_data1;
781 Form = dwarf::DW_FORM_data2;
784 Form = dwarf::DW_FORM_data4;
787 Form = dwarf::DW_FORM_data8;
790 Form = dwarf::DW_FORM_udata;
791 addUInt(Die, dwarf::DW_AT_const_value, Form, MO.getImm());
794 addUInt(Die, dwarf::DW_AT_const_value, Form, MO.getImm());
797 /// addConstantFPValue - Add constant value entry in variable DIE.
798 void CompileUnit::addConstantFPValue(DIE *Die, const MachineOperand &MO) {
799 assert(MO.isFPImm() && "Invalid machine operand!");
800 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
801 APFloat FPImm = MO.getFPImm()->getValueAPF();
803 // Get the raw data form of the floating point.
804 const APInt FltVal = FPImm.bitcastToAPInt();
805 const char *FltPtr = (const char *)FltVal.getRawData();
807 int NumBytes = FltVal.getBitWidth() / 8; // 8 bits per byte.
808 bool LittleEndian = Asm->getDataLayout().isLittleEndian();
809 int Incr = (LittleEndian ? 1 : -1);
810 int Start = (LittleEndian ? 0 : NumBytes - 1);
811 int Stop = (LittleEndian ? NumBytes : -1);
813 // Output the constant to DWARF one byte at a time.
814 for (; Start != Stop; Start += Incr)
815 addUInt(Block, dwarf::DW_FORM_data1, (unsigned char)0xFF & FltPtr[Start]);
817 addBlock(Die, dwarf::DW_AT_const_value, Block);
820 /// addConstantFPValue - Add constant value entry in variable DIE.
821 void CompileUnit::addConstantFPValue(DIE *Die, const ConstantFP *CFP) {
822 // Pass this down to addConstantValue as an unsigned bag of bits.
823 addConstantValue(Die, CFP->getValueAPF().bitcastToAPInt(), true);
826 /// addConstantValue - Add constant value entry in variable DIE.
827 void CompileUnit::addConstantValue(DIE *Die, const ConstantInt *CI,
829 addConstantValue(Die, CI->getValue(), Unsigned);
832 // addConstantValue - Add constant value entry in variable DIE.
833 void CompileUnit::addConstantValue(DIE *Die, const APInt &Val, bool Unsigned) {
834 unsigned CIBitWidth = Val.getBitWidth();
835 if (CIBitWidth <= 64) {
836 // If we're a signed constant definitely use sdata.
838 addSInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata,
843 // Else use data for now unless it's larger than we can deal with.
845 switch (CIBitWidth) {
847 Form = dwarf::DW_FORM_data1;
850 Form = dwarf::DW_FORM_data2;
853 Form = dwarf::DW_FORM_data4;
856 Form = dwarf::DW_FORM_data8;
859 addUInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_udata,
863 addUInt(Die, dwarf::DW_AT_const_value, Form, Val.getZExtValue());
867 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
869 // Get the raw data form of the large APInt.
870 const uint64_t *Ptr64 = Val.getRawData();
872 int NumBytes = Val.getBitWidth() / 8; // 8 bits per byte.
873 bool LittleEndian = Asm->getDataLayout().isLittleEndian();
875 // Output the constant to DWARF one byte at a time.
876 for (int i = 0; i < NumBytes; i++) {
879 c = Ptr64[i / 8] >> (8 * (i & 7));
881 c = Ptr64[(NumBytes - 1 - i) / 8] >> (8 * ((NumBytes - 1 - i) & 7));
882 addUInt(Block, dwarf::DW_FORM_data1, c);
885 addBlock(Die, dwarf::DW_AT_const_value, Block);
888 /// addTemplateParams - Add template parameters into buffer.
889 void CompileUnit::addTemplateParams(DIE &Buffer, DIArray TParams) {
890 // Add template parameters.
891 for (unsigned i = 0, e = TParams.getNumElements(); i != e; ++i) {
892 DIDescriptor Element = TParams.getElement(i);
893 if (Element.isTemplateTypeParameter())
894 constructTemplateTypeParameterDIE(Buffer,
895 DITemplateTypeParameter(Element));
896 else if (Element.isTemplateValueParameter())
897 constructTemplateValueParameterDIE(Buffer,
898 DITemplateValueParameter(Element));
902 /// getOrCreateContextDIE - Get context owner's DIE.
903 DIE *CompileUnit::getOrCreateContextDIE(DIScope Context) {
904 if (!Context || Context.isFile())
906 if (Context.isType())
907 return getOrCreateTypeDIE(DIType(Context));
908 if (Context.isNameSpace())
909 return getOrCreateNameSpace(DINameSpace(Context));
910 if (Context.isSubprogram())
911 return getOrCreateSubprogramDIE(DISubprogram(Context));
912 return getDIE(Context);
915 DIE *CompileUnit::createTypeDIE(DICompositeType Ty) {
916 DIScope Context = resolve(Ty.getContext());
917 DIE *ContextDIE = getOrCreateContextDIE(Context);
919 DIE *TyDIE = getDIE(Ty);
924 TyDIE = createAndAddDIE(Ty.getTag(), *ContextDIE, Ty);
926 constructTypeDIE(*TyDIE, Ty);
928 updateAcceleratorTables(Context, Ty, TyDIE);
932 /// Return true if the type is appropriately scoped to be contained inside
933 /// its own type unit.
934 static bool isTypeUnitScoped(DIType Ty, const DwarfDebug *DD) {
935 DIScope Parent = DD->resolve(Ty.getContext());
937 // Don't generate a hash for anything scoped inside a function.
938 if (Parent.isSubprogram())
940 Parent = DD->resolve(Parent.getContext());
945 /// Return true if the type should be split out into a type unit.
946 static bool shouldCreateTypeUnit(DICompositeType CTy, const DwarfDebug *DD) {
947 if (!GenerateTypeUnits)
950 uint16_t Tag = CTy.getTag();
953 case dwarf::DW_TAG_structure_type:
954 case dwarf::DW_TAG_union_type:
955 case dwarf::DW_TAG_enumeration_type:
956 case dwarf::DW_TAG_class_type:
957 // If this is a class, structure, union, or enumeration type
958 // that is a definition (not a declaration), and not scoped
959 // inside a function then separate this out as a type unit.
960 return !CTy.isForwardDecl() && isTypeUnitScoped(CTy, DD);
966 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
968 DIE *CompileUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
975 // Construct the context before querying for the existence of the DIE in case
976 // such construction creates the DIE.
977 DIScope Context = resolve(Ty.getContext());
978 DIE *ContextDIE = getOrCreateContextDIE(Context);
981 DIE *TyDIE = getDIE(Ty);
986 TyDIE = createAndAddDIE(Ty.getTag(), *ContextDIE, Ty);
988 if (Ty.isBasicType())
989 constructTypeDIE(*TyDIE, DIBasicType(Ty));
990 else if (Ty.isCompositeType()) {
991 DICompositeType CTy(Ty);
992 if (shouldCreateTypeUnit(CTy, DD)) {
993 DD->addTypeUnitType(TyDIE, CTy);
994 // Skip updating the accellerator tables since this is not the full type
997 constructTypeDIE(*TyDIE, CTy);
999 assert(Ty.isDerivedType() && "Unknown kind of DIType");
1000 constructTypeDIE(*TyDIE, DIDerivedType(Ty));
1003 updateAcceleratorTables(Context, Ty, TyDIE);
1008 void CompileUnit::updateAcceleratorTables(DIScope Context, DIType Ty,
1010 if (!Ty.getName().empty() && !Ty.isForwardDecl()) {
1011 bool IsImplementation = 0;
1012 if (Ty.isCompositeType()) {
1013 DICompositeType CT(Ty);
1014 // A runtime language of 0 actually means C/C++ and that any
1015 // non-negative value is some version of Objective-C/C++.
1016 IsImplementation = (CT.getRunTimeLang() == 0) || CT.isObjcClassComplete();
1018 unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0;
1019 addAccelType(Ty.getName(), std::make_pair(TyDIE, Flags));
1021 if (!Context || Context.isCompileUnit() || Context.isFile() ||
1022 Context.isNameSpace())
1023 GlobalTypes[getParentContextString(Context) + Ty.getName().str()] = TyDIE;
1027 /// addType - Add a new type attribute to the specified entity.
1028 void CompileUnit::addType(DIE *Entity, DIType Ty, dwarf::Attribute Attribute) {
1029 assert(Ty && "Trying to add a type that doesn't exist?");
1031 // Check for pre-existence.
1032 DIEEntry *Entry = getDIEEntry(Ty);
1033 // If it exists then use the existing value.
1035 addDIEEntry(Entity, Attribute, Entry);
1040 DIE *Buffer = getOrCreateTypeDIE(Ty);
1043 Entry = createDIEEntry(Buffer);
1044 insertDIEEntry(Ty, Entry);
1045 addDIEEntry(Entity, Attribute, Entry);
1048 // Accelerator table mutators - add each name along with its companion
1049 // DIE to the proper table while ensuring that the name that we're going
1050 // to reference is in the string table. We do this since the names we
1051 // add may not only be identical to the names in the DIE.
1052 void CompileUnit::addAccelName(StringRef Name, const DIE *Die) {
1053 DU->getStringPoolEntry(Name);
1054 std::vector<const DIE *> &DIEs = AccelNames[Name];
1055 DIEs.push_back(Die);
1058 void CompileUnit::addAccelObjC(StringRef Name, const DIE *Die) {
1059 DU->getStringPoolEntry(Name);
1060 std::vector<const DIE *> &DIEs = AccelObjC[Name];
1061 DIEs.push_back(Die);
1064 void CompileUnit::addAccelNamespace(StringRef Name, const DIE *Die) {
1065 DU->getStringPoolEntry(Name);
1066 std::vector<const DIE *> &DIEs = AccelNamespace[Name];
1067 DIEs.push_back(Die);
1070 void CompileUnit::addAccelType(StringRef Name,
1071 std::pair<const DIE *, unsigned> Die) {
1072 DU->getStringPoolEntry(Name);
1073 std::vector<std::pair<const DIE *, unsigned> > &DIEs = AccelTypes[Name];
1074 DIEs.push_back(Die);
1077 /// addGlobalName - Add a new global name to the compile unit.
1078 void CompileUnit::addGlobalName(StringRef Name, DIE *Die, DIScope Context) {
1079 std::string FullName = getParentContextString(Context) + Name.str();
1080 GlobalNames[FullName] = Die;
1083 /// getParentContextString - Walks the metadata parent chain in a language
1084 /// specific manner (using the compile unit language) and returns
1085 /// it as a string. This is done at the metadata level because DIEs may
1086 /// not currently have been added to the parent context and walking the
1087 /// DIEs looking for names is more expensive than walking the metadata.
1088 std::string CompileUnit::getParentContextString(DIScope Context) const {
1092 // FIXME: Decide whether to implement this for non-C++ languages.
1093 if (getLanguage() != dwarf::DW_LANG_C_plus_plus)
1097 SmallVector<DIScope, 1> Parents;
1098 while (!Context.isCompileUnit()) {
1099 Parents.push_back(Context);
1100 if (Context.getContext())
1101 Context = resolve(Context.getContext());
1103 // Structure, etc types will have a NULL context if they're at the top
1108 // Reverse iterate over our list to go from the outermost construct to the
1110 for (SmallVectorImpl<DIScope>::reverse_iterator I = Parents.rbegin(),
1114 StringRef Name = Ctx.getName();
1115 if (!Name.empty()) {
1123 /// constructTypeDIE - Construct basic type die from DIBasicType.
1124 void CompileUnit::constructTypeDIE(DIE &Buffer, DIBasicType BTy) {
1125 // Get core information.
1126 StringRef Name = BTy.getName();
1127 // Add name if not anonymous or intermediate type.
1129 addString(&Buffer, dwarf::DW_AT_name, Name);
1131 // An unspecified type only has a name attribute.
1132 if (BTy.getTag() == dwarf::DW_TAG_unspecified_type)
1135 addUInt(&Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1138 uint64_t Size = BTy.getSizeInBits() >> 3;
1139 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1142 /// constructTypeDIE - Construct derived type die from DIDerivedType.
1143 void CompileUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
1144 // Get core information.
1145 StringRef Name = DTy.getName();
1146 uint64_t Size = DTy.getSizeInBits() >> 3;
1147 uint16_t Tag = Buffer.getTag();
1149 // Map to main type, void will not have a type.
1150 DIType FromTy = resolve(DTy.getTypeDerivedFrom());
1152 addType(&Buffer, FromTy);
1154 // Add name if not anonymous or intermediate type.
1156 addString(&Buffer, dwarf::DW_AT_name, Name);
1158 // Add size if non-zero (derived types might be zero-sized.)
1159 if (Size && Tag != dwarf::DW_TAG_pointer_type)
1160 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1162 if (Tag == dwarf::DW_TAG_ptr_to_member_type)
1163 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
1164 getOrCreateTypeDIE(resolve(DTy.getClassType())));
1165 // Add source line info if available and TyDesc is not a forward declaration.
1166 if (!DTy.isForwardDecl())
1167 addSourceLine(&Buffer, DTy);
1170 /// constructTypeDIE - Construct type DIE from DICompositeType.
1171 void CompileUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
1172 // Add name if not anonymous or intermediate type.
1173 StringRef Name = CTy.getName();
1175 uint64_t Size = CTy.getSizeInBits() >> 3;
1176 uint16_t Tag = Buffer.getTag();
1179 case dwarf::DW_TAG_array_type:
1180 constructArrayTypeDIE(Buffer, CTy);
1182 case dwarf::DW_TAG_enumeration_type:
1183 constructEnumTypeDIE(Buffer, CTy);
1185 case dwarf::DW_TAG_subroutine_type: {
1186 // Add return type. A void return won't have a type.
1187 DIArray Elements = CTy.getTypeArray();
1188 DIType RTy(Elements.getElement(0));
1190 addType(&Buffer, RTy);
1192 bool isPrototyped = true;
1194 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
1195 DIDescriptor Ty = Elements.getElement(i);
1196 if (Ty.isUnspecifiedParameter()) {
1197 createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
1198 isPrototyped = false;
1200 DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
1201 addType(Arg, DIType(Ty));
1202 if (DIType(Ty).isArtificial())
1203 addFlag(Arg, dwarf::DW_AT_artificial);
1206 // Add prototype flag if we're dealing with a C language and the
1207 // function has been prototyped.
1208 uint16_t Language = getLanguage();
1210 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1211 Language == dwarf::DW_LANG_ObjC))
1212 addFlag(&Buffer, dwarf::DW_AT_prototyped);
1214 case dwarf::DW_TAG_structure_type:
1215 case dwarf::DW_TAG_union_type:
1216 case dwarf::DW_TAG_class_type: {
1217 // Add elements to structure type.
1218 DIArray Elements = CTy.getTypeArray();
1219 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1220 DIDescriptor Element = Elements.getElement(i);
1221 DIE *ElemDie = NULL;
1222 if (Element.isSubprogram()) {
1223 DISubprogram SP(Element);
1224 ElemDie = getOrCreateSubprogramDIE(SP);
1225 if (SP.isProtected())
1226 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1227 dwarf::DW_ACCESS_protected);
1228 else if (SP.isPrivate())
1229 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1230 dwarf::DW_ACCESS_private);
1232 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1233 dwarf::DW_ACCESS_public);
1234 if (SP.isExplicit())
1235 addFlag(ElemDie, dwarf::DW_AT_explicit);
1236 } else if (Element.isDerivedType()) {
1237 DIDerivedType DDTy(Element);
1238 if (DDTy.getTag() == dwarf::DW_TAG_friend) {
1239 ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
1240 addType(ElemDie, resolve(DDTy.getTypeDerivedFrom()),
1241 dwarf::DW_AT_friend);
1242 } else if (DDTy.isStaticMember()) {
1243 getOrCreateStaticMemberDIE(DDTy);
1245 constructMemberDIE(Buffer, DDTy);
1247 } else if (Element.isObjCProperty()) {
1248 DIObjCProperty Property(Element);
1249 ElemDie = createAndAddDIE(Property.getTag(), Buffer);
1250 StringRef PropertyName = Property.getObjCPropertyName();
1251 addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
1252 addType(ElemDie, Property.getType());
1253 addSourceLine(ElemDie, Property);
1254 StringRef GetterName = Property.getObjCPropertyGetterName();
1255 if (!GetterName.empty())
1256 addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
1257 StringRef SetterName = Property.getObjCPropertySetterName();
1258 if (!SetterName.empty())
1259 addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
1260 unsigned PropertyAttributes = 0;
1261 if (Property.isReadOnlyObjCProperty())
1262 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readonly;
1263 if (Property.isReadWriteObjCProperty())
1264 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readwrite;
1265 if (Property.isAssignObjCProperty())
1266 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_assign;
1267 if (Property.isRetainObjCProperty())
1268 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_retain;
1269 if (Property.isCopyObjCProperty())
1270 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_copy;
1271 if (Property.isNonAtomicObjCProperty())
1272 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_nonatomic;
1273 if (PropertyAttributes)
1274 addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, None,
1275 PropertyAttributes);
1277 DIEEntry *Entry = getDIEEntry(Element);
1279 Entry = createDIEEntry(ElemDie);
1280 insertDIEEntry(Element, Entry);
1286 if (CTy.isAppleBlockExtension())
1287 addFlag(&Buffer, dwarf::DW_AT_APPLE_block);
1289 DICompositeType ContainingType(resolve(CTy.getContainingType()));
1291 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
1292 getOrCreateTypeDIE(ContainingType));
1294 if (CTy.isObjcClassComplete())
1295 addFlag(&Buffer, dwarf::DW_AT_APPLE_objc_complete_type);
1297 // Add template parameters to a class, structure or union types.
1298 // FIXME: The support isn't in the metadata for this yet.
1299 if (Tag == dwarf::DW_TAG_class_type ||
1300 Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type)
1301 addTemplateParams(Buffer, CTy.getTemplateParams());
1309 // Add name if not anonymous or intermediate type.
1311 addString(&Buffer, dwarf::DW_AT_name, Name);
1313 if (Tag == dwarf::DW_TAG_enumeration_type ||
1314 Tag == dwarf::DW_TAG_class_type || Tag == dwarf::DW_TAG_structure_type ||
1315 Tag == dwarf::DW_TAG_union_type) {
1316 // Add size if non-zero (derived types might be zero-sized.)
1317 // TODO: Do we care about size for enum forward declarations?
1319 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1320 else if (!CTy.isForwardDecl())
1321 // Add zero size if it is not a forward declaration.
1322 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, 0);
1324 // If we're a forward decl, say so.
1325 if (CTy.isForwardDecl())
1326 addFlag(&Buffer, dwarf::DW_AT_declaration);
1328 // Add source line info if available.
1329 if (!CTy.isForwardDecl())
1330 addSourceLine(&Buffer, CTy);
1332 // No harm in adding the runtime language to the declaration.
1333 unsigned RLang = CTy.getRunTimeLang();
1335 addUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class, dwarf::DW_FORM_data1,
1340 /// constructTemplateTypeParameterDIE - Construct new DIE for the given
1341 /// DITemplateTypeParameter.
1343 CompileUnit::constructTemplateTypeParameterDIE(DIE &Buffer,
1344 DITemplateTypeParameter TP) {
1346 createAndAddDIE(dwarf::DW_TAG_template_type_parameter, Buffer);
1347 // Add the type if it exists, it could be void and therefore no type.
1349 addType(ParamDIE, resolve(TP.getType()));
1350 if (!TP.getName().empty())
1351 addString(ParamDIE, dwarf::DW_AT_name, TP.getName());
1354 /// constructTemplateValueParameterDIE - Construct new DIE for the given
1355 /// DITemplateValueParameter.
1357 CompileUnit::constructTemplateValueParameterDIE(DIE &Buffer,
1358 DITemplateValueParameter VP) {
1359 DIE *ParamDIE = createAndAddDIE(VP.getTag(), Buffer);
1361 // Add the type if there is one, template template and template parameter
1362 // packs will not have a type.
1363 if (VP.getTag() == dwarf::DW_TAG_template_value_parameter)
1364 addType(ParamDIE, resolve(VP.getType()));
1365 if (!VP.getName().empty())
1366 addString(ParamDIE, dwarf::DW_AT_name, VP.getName());
1367 if (Value *Val = VP.getValue()) {
1368 if (ConstantInt *CI = dyn_cast<ConstantInt>(Val))
1369 addConstantValue(ParamDIE, CI,
1370 isUnsignedDIType(DD, resolve(VP.getType())));
1371 else if (GlobalValue *GV = dyn_cast<GlobalValue>(Val)) {
1372 // For declaration non-type template parameters (such as global values and
1374 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1375 addOpAddress(Block, Asm->getSymbol(GV));
1376 // Emit DW_OP_stack_value to use the address as the immediate value of the
1377 // parameter, rather than a pointer to it.
1378 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
1379 addBlock(ParamDIE, dwarf::DW_AT_location, Block);
1380 } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_template_param) {
1381 assert(isa<MDString>(Val));
1382 addString(ParamDIE, dwarf::DW_AT_GNU_template_name,
1383 cast<MDString>(Val)->getString());
1384 } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_parameter_pack) {
1385 assert(isa<MDNode>(Val));
1386 DIArray A(cast<MDNode>(Val));
1387 addTemplateParams(*ParamDIE, A);
1392 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
1393 DIE *CompileUnit::getOrCreateNameSpace(DINameSpace NS) {
1394 // Construct the context before querying for the existence of the DIE in case
1395 // such construction creates the DIE.
1396 DIE *ContextDIE = getOrCreateContextDIE(NS.getContext());
1398 DIE *NDie = getDIE(NS);
1401 NDie = createAndAddDIE(dwarf::DW_TAG_namespace, *ContextDIE, NS);
1403 if (!NS.getName().empty()) {
1404 addString(NDie, dwarf::DW_AT_name, NS.getName());
1405 addAccelNamespace(NS.getName(), NDie);
1406 addGlobalName(NS.getName(), NDie, NS.getContext());
1408 addAccelNamespace("(anonymous namespace)", NDie);
1409 addSourceLine(NDie, NS);
1413 /// getOrCreateSubprogramDIE - Create new DIE using SP.
1414 DIE *CompileUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
1415 // Construct the context before querying for the existence of the DIE in case
1416 // such construction creates the DIE (as is the case for member function
1418 DIE *ContextDIE = getOrCreateContextDIE(resolve(SP.getContext()));
1420 DIE *SPDie = getDIE(SP);
1424 DISubprogram SPDecl = SP.getFunctionDeclaration();
1425 if (SPDecl.isSubprogram())
1426 // Add subprogram definitions to the CU die directly.
1427 ContextDIE = CUDie.get();
1429 // DW_TAG_inlined_subroutine may refer to this DIE.
1430 SPDie = createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, SP);
1432 DIE *DeclDie = NULL;
1433 if (SPDecl.isSubprogram())
1434 DeclDie = getOrCreateSubprogramDIE(SPDecl);
1436 // Add function template parameters.
1437 addTemplateParams(*SPDie, SP.getTemplateParams());
1439 // If this DIE is going to refer declaration info using AT_specification
1440 // then there is no need to add other attributes.
1442 // Refer function declaration directly.
1443 addDIEEntry(SPDie, dwarf::DW_AT_specification, DeclDie);
1448 // Add the linkage name if we have one.
1449 StringRef LinkageName = SP.getLinkageName();
1450 if (!LinkageName.empty())
1451 addString(SPDie, dwarf::DW_AT_MIPS_linkage_name,
1452 GlobalValue::getRealLinkageName(LinkageName));
1454 // Constructors and operators for anonymous aggregates do not have names.
1455 if (!SP.getName().empty())
1456 addString(SPDie, dwarf::DW_AT_name, SP.getName());
1458 addSourceLine(SPDie, SP);
1460 // Add the prototype if we have a prototype and we have a C like
1462 uint16_t Language = getLanguage();
1463 if (SP.isPrototyped() &&
1464 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1465 Language == dwarf::DW_LANG_ObjC))
1466 addFlag(SPDie, dwarf::DW_AT_prototyped);
1468 DICompositeType SPTy = SP.getType();
1469 assert(SPTy.getTag() == dwarf::DW_TAG_subroutine_type &&
1470 "the type of a subprogram should be a subroutine");
1472 DIArray Args = SPTy.getTypeArray();
1473 // Add a return type. If this is a type like a C/C++ void type we don't add a
1475 if (Args.getElement(0))
1476 addType(SPDie, DIType(Args.getElement(0)));
1478 unsigned VK = SP.getVirtuality();
1480 addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
1481 DIEBlock *Block = getDIEBlock();
1482 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1483 addUInt(Block, dwarf::DW_FORM_udata, SP.getVirtualIndex());
1484 addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, Block);
1485 ContainingTypeMap.insert(
1486 std::make_pair(SPDie, resolve(SP.getContainingType())));
1489 if (!SP.isDefinition()) {
1490 addFlag(SPDie, dwarf::DW_AT_declaration);
1492 // Add arguments. Do not add arguments for subprogram definition. They will
1493 // be handled while processing variables.
1494 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
1495 DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, *SPDie);
1496 DIType ATy(Args.getElement(i));
1498 if (ATy.isArtificial())
1499 addFlag(Arg, dwarf::DW_AT_artificial);
1503 if (SP.isArtificial())
1504 addFlag(SPDie, dwarf::DW_AT_artificial);
1506 if (!SP.isLocalToUnit())
1507 addFlag(SPDie, dwarf::DW_AT_external);
1509 if (SP.isOptimized())
1510 addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);
1512 if (unsigned isa = Asm->getISAEncoding()) {
1513 addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
1519 // Return const expression if value is a GEP to access merged global
1521 // i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
1522 static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
1523 const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
1524 if (!CE || CE->getNumOperands() != 3 ||
1525 CE->getOpcode() != Instruction::GetElementPtr)
1528 // First operand points to a global struct.
1529 Value *Ptr = CE->getOperand(0);
1530 if (!isa<GlobalValue>(Ptr) ||
1531 !isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
1534 // Second operand is zero.
1535 const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
1536 if (!CI || !CI->isZero())
1539 // Third operand is offset.
1540 if (!isa<ConstantInt>(CE->getOperand(2)))
1546 /// createGlobalVariableDIE - create global variable DIE.
1547 void CompileUnit::createGlobalVariableDIE(DIGlobalVariable GV) {
1548 // Check for pre-existence.
1552 if (!GV.isGlobalVariable())
1555 DIScope GVContext = GV.getContext();
1556 DIType GTy = GV.getType();
1558 // If this is a static data member definition, some attributes belong
1559 // to the declaration DIE.
1560 DIE *VariableDIE = NULL;
1561 bool IsStaticMember = false;
1562 DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration();
1563 if (SDMDecl.Verify()) {
1564 assert(SDMDecl.isStaticMember() && "Expected static member decl");
1565 // We need the declaration DIE that is in the static member's class.
1566 VariableDIE = getOrCreateStaticMemberDIE(SDMDecl);
1567 IsStaticMember = true;
1570 // If this is not a static data member definition, create the variable
1571 // DIE and add the initial set of attributes to it.
1573 // Construct the context before querying for the existence of the DIE in
1574 // case such construction creates the DIE.
1575 DIE *ContextDIE = getOrCreateContextDIE(GVContext);
1578 VariableDIE = createAndAddDIE(GV.getTag(), *ContextDIE, GV);
1580 // Add name and type.
1581 addString(VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
1582 addType(VariableDIE, GTy);
1584 // Add scoping info.
1585 if (!GV.isLocalToUnit())
1586 addFlag(VariableDIE, dwarf::DW_AT_external);
1588 // Add line number info.
1589 addSourceLine(VariableDIE, GV);
1593 bool addToAccelTable = false;
1594 DIE *VariableSpecDIE = NULL;
1595 bool isGlobalVariable = GV.getGlobal() != NULL;
1596 if (isGlobalVariable) {
1597 addToAccelTable = true;
1598 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1599 const MCSymbol *Sym = Asm->getSymbol(GV.getGlobal());
1600 if (GV.getGlobal()->isThreadLocal()) {
1601 // FIXME: Make this work with -gsplit-dwarf.
1602 unsigned PointerSize = Asm->getDataLayout().getPointerSize();
1603 assert((PointerSize == 4 || PointerSize == 8) &&
1604 "Add support for other sizes if necessary");
1605 const MCExpr *Expr =
1606 Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym);
1607 // Based on GCC's support for TLS:
1608 if (!DD->useSplitDwarf()) {
1609 // 1) Start with a constNu of the appropriate pointer size
1610 addUInt(Block, dwarf::DW_FORM_data1,
1611 PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
1612 // 2) containing the (relocated) offset of the TLS variable
1613 // within the module's TLS block.
1614 addExpr(Block, dwarf::DW_FORM_udata, Expr);
1616 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
1617 addUInt(Block, dwarf::DW_FORM_udata, DU->getAddrPoolIndex(Expr));
1619 // 3) followed by a custom OP to make the debugger do a TLS lookup.
1620 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
1622 addOpAddress(Block, Sym);
1623 // Do not create specification DIE if context is either compile unit
1625 if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
1626 !GVContext.isFile() && !DD->isSubprogramContext(GVContext)) {
1627 // Create specification DIE.
1628 VariableSpecDIE = createAndAddDIE(dwarf::DW_TAG_variable, *CUDie);
1629 addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification, VariableDIE);
1630 addBlock(VariableSpecDIE, dwarf::DW_AT_location, Block);
1631 // A static member's declaration is already flagged as such.
1632 if (!SDMDecl.Verify())
1633 addFlag(VariableDIE, dwarf::DW_AT_declaration);
1635 addBlock(VariableDIE, dwarf::DW_AT_location, Block);
1637 // Add the linkage name.
1638 StringRef LinkageName = GV.getLinkageName();
1639 if (!LinkageName.empty())
1640 // From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
1641 // TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
1643 addString(IsStaticMember && VariableSpecDIE ? VariableSpecDIE
1645 dwarf::DW_AT_MIPS_linkage_name,
1646 GlobalValue::getRealLinkageName(LinkageName));
1647 } else if (const ConstantInt *CI =
1648 dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
1649 // AT_const_value was added when the static member was created. To avoid
1650 // emitting AT_const_value multiple times, we only add AT_const_value when
1651 // it is not a static member.
1652 if (!IsStaticMember)
1653 addConstantValue(VariableDIE, CI, isUnsignedDIType(DD, GTy));
1654 } else if (const ConstantExpr *CE = getMergedGlobalExpr(GV->getOperand(11))) {
1655 addToAccelTable = true;
1656 // GV is a merged global.
1657 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1658 Value *Ptr = CE->getOperand(0);
1659 addOpAddress(Block, Asm->getSymbol(cast<GlobalValue>(Ptr)));
1660 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1661 SmallVector<Value *, 3> Idx(CE->op_begin() + 1, CE->op_end());
1662 addUInt(Block, dwarf::DW_FORM_udata,
1663 Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx));
1664 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1665 addBlock(VariableDIE, dwarf::DW_AT_location, Block);
1668 if (addToAccelTable) {
1669 DIE *AddrDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
1670 addAccelName(GV.getName(), AddrDIE);
1672 // If the linkage name is different than the name, go ahead and output
1673 // that as well into the name table.
1674 if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
1675 addAccelName(GV.getLinkageName(), AddrDIE);
1678 if (!GV.isLocalToUnit())
1679 addGlobalName(GV.getName(), VariableSpecDIE ? VariableSpecDIE : VariableDIE,
1683 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
1684 void CompileUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR,
1686 DIE *DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
1687 addDIEEntry(DW_Subrange, dwarf::DW_AT_type, IndexTy);
1689 // The LowerBound value defines the lower bounds which is typically zero for
1690 // C/C++. The Count value is the number of elements. Values are 64 bit. If
1691 // Count == -1 then the array is unbounded and we do not emit
1692 // DW_AT_lower_bound and DW_AT_upper_bound attributes. If LowerBound == 0 and
1693 // Count == 0, then the array has zero elements in which case we do not emit
1695 int64_t LowerBound = SR.getLo();
1696 int64_t DefaultLowerBound = getDefaultLowerBound();
1697 int64_t Count = SR.getCount();
1699 if (DefaultLowerBound == -1 || LowerBound != DefaultLowerBound)
1700 addUInt(DW_Subrange, dwarf::DW_AT_lower_bound, None, LowerBound);
1702 if (Count != -1 && Count != 0)
1703 // FIXME: An unbounded array should reference the expression that defines
1705 addUInt(DW_Subrange, dwarf::DW_AT_upper_bound, None,
1706 LowerBound + Count - 1);
1709 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
1710 void CompileUnit::constructArrayTypeDIE(DIE &Buffer, DICompositeType CTy) {
1712 addFlag(&Buffer, dwarf::DW_AT_GNU_vector);
1714 // Emit the element type.
1715 addType(&Buffer, resolve(CTy.getTypeDerivedFrom()));
1717 // Get an anonymous type for index type.
1718 // FIXME: This type should be passed down from the front end
1719 // as different languages may have different sizes for indexes.
1720 DIE *IdxTy = getIndexTyDie();
1722 // Construct an anonymous type for index type.
1723 IdxTy = createAndAddDIE(dwarf::DW_TAG_base_type, *CUDie.get());
1724 addString(IdxTy, dwarf::DW_AT_name, "int");
1725 addUInt(IdxTy, dwarf::DW_AT_byte_size, None, sizeof(int32_t));
1726 addUInt(IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1727 dwarf::DW_ATE_signed);
1728 setIndexTyDie(IdxTy);
1731 // Add subranges to array type.
1732 DIArray Elements = CTy.getTypeArray();
1733 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1734 DIDescriptor Element = Elements.getElement(i);
1735 if (Element.getTag() == dwarf::DW_TAG_subrange_type)
1736 constructSubrangeDIE(Buffer, DISubrange(Element), IdxTy);
1740 /// constructEnumTypeDIE - Construct an enum type DIE from DICompositeType.
1741 void CompileUnit::constructEnumTypeDIE(DIE &Buffer, DICompositeType CTy) {
1742 DIArray Elements = CTy.getTypeArray();
1744 // Add enumerators to enumeration type.
1745 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1746 DIEnumerator Enum(Elements.getElement(i));
1747 if (Enum.isEnumerator()) {
1748 DIE *Enumerator = createAndAddDIE(dwarf::DW_TAG_enumerator, Buffer);
1749 StringRef Name = Enum.getName();
1750 addString(Enumerator, dwarf::DW_AT_name, Name);
1751 int64_t Value = Enum.getEnumValue();
1752 addSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata,
1756 DIType DTy = resolve(CTy.getTypeDerivedFrom());
1758 addType(&Buffer, DTy);
1759 addFlag(&Buffer, dwarf::DW_AT_enum_class);
1763 /// constructContainingTypeDIEs - Construct DIEs for types that contain
1765 void CompileUnit::constructContainingTypeDIEs() {
1766 for (DenseMap<DIE *, const MDNode *>::iterator CI = ContainingTypeMap.begin(),
1767 CE = ContainingTypeMap.end();
1769 DIE *SPDie = CI->first;
1770 DIDescriptor D(CI->second);
1773 DIE *NDie = getDIE(D);
1776 addDIEEntry(SPDie, dwarf::DW_AT_containing_type, NDie);
1780 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
1781 DIE *CompileUnit::constructVariableDIE(DbgVariable &DV, bool isScopeAbstract) {
1782 StringRef Name = DV.getName();
1784 // Define variable debug information entry.
1785 DIE *VariableDie = new DIE(DV.getTag());
1786 DbgVariable *AbsVar = DV.getAbstractVariable();
1787 DIE *AbsDIE = AbsVar ? AbsVar->getDIE() : NULL;
1789 addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin, AbsDIE);
1792 addString(VariableDie, dwarf::DW_AT_name, Name);
1793 addSourceLine(VariableDie, DV.getVariable());
1794 addType(VariableDie, DV.getType());
1797 if (DV.isArtificial())
1798 addFlag(VariableDie, dwarf::DW_AT_artificial);
1800 if (isScopeAbstract) {
1801 DV.setDIE(VariableDie);
1805 // Add variable address.
1807 unsigned Offset = DV.getDotDebugLocOffset();
1808 if (Offset != ~0U) {
1809 addSectionLabel(VariableDie, dwarf::DW_AT_location,
1810 Asm->GetTempSymbol("debug_loc", Offset));
1811 DV.setDIE(VariableDie);
1815 // Check if variable is described by a DBG_VALUE instruction.
1816 if (const MachineInstr *DVInsn = DV.getMInsn()) {
1817 assert(DVInsn->getNumOperands() == 3);
1818 if (DVInsn->getOperand(0).isReg()) {
1819 const MachineOperand RegOp = DVInsn->getOperand(0);
1820 // If the second operand is an immediate, this is an indirect value.
1821 if (DVInsn->getOperand(1).isImm()) {
1822 MachineLocation Location(RegOp.getReg(),
1823 DVInsn->getOperand(1).getImm());
1824 addVariableAddress(DV, VariableDie, Location);
1825 } else if (RegOp.getReg())
1826 addVariableAddress(DV, VariableDie, MachineLocation(RegOp.getReg()));
1827 } else if (DVInsn->getOperand(0).isImm())
1828 addConstantValue(VariableDie, DVInsn->getOperand(0), DV.getType());
1829 else if (DVInsn->getOperand(0).isFPImm())
1830 addConstantFPValue(VariableDie, DVInsn->getOperand(0));
1831 else if (DVInsn->getOperand(0).isCImm())
1832 addConstantValue(VariableDie, DVInsn->getOperand(0).getCImm(),
1833 isUnsignedDIType(DD, DV.getType()));
1835 DV.setDIE(VariableDie);
1838 // .. else use frame index.
1839 int FI = DV.getFrameIndex();
1841 unsigned FrameReg = 0;
1842 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
1843 int Offset = TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
1844 MachineLocation Location(FrameReg, Offset);
1845 addVariableAddress(DV, VariableDie, Location);
1849 DV.setDIE(VariableDie);
1853 /// constructMemberDIE - Construct member DIE from DIDerivedType.
1854 void CompileUnit::constructMemberDIE(DIE &Buffer, DIDerivedType DT) {
1855 DIE *MemberDie = createAndAddDIE(DT.getTag(), Buffer);
1856 StringRef Name = DT.getName();
1858 addString(MemberDie, dwarf::DW_AT_name, Name);
1860 addType(MemberDie, resolve(DT.getTypeDerivedFrom()));
1862 addSourceLine(MemberDie, DT);
1864 DIEBlock *MemLocationDie = new (DIEValueAllocator) DIEBlock();
1865 addUInt(MemLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
1867 if (DT.getTag() == dwarf::DW_TAG_inheritance && DT.isVirtual()) {
1869 // For C++, virtual base classes are not at fixed offset. Use following
1870 // expression to extract appropriate offset from vtable.
1871 // BaseAddr = ObAddr + *((*ObAddr) - Offset)
1873 DIEBlock *VBaseLocationDie = new (DIEValueAllocator) DIEBlock();
1874 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
1875 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1876 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1877 addUInt(VBaseLocationDie, dwarf::DW_FORM_udata, DT.getOffsetInBits());
1878 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
1879 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1880 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1882 addBlock(MemberDie, dwarf::DW_AT_data_member_location, VBaseLocationDie);
1884 uint64_t Size = DT.getSizeInBits();
1885 uint64_t FieldSize = getBaseTypeSize(DD, DT);
1886 uint64_t OffsetInBytes;
1888 if (Size != FieldSize) {
1890 addUInt(MemberDie, dwarf::DW_AT_byte_size, None,
1891 getBaseTypeSize(DD, DT) >> 3);
1892 addUInt(MemberDie, dwarf::DW_AT_bit_size, None, DT.getSizeInBits());
1894 uint64_t Offset = DT.getOffsetInBits();
1895 uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
1896 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1897 uint64_t FieldOffset = (HiMark - FieldSize);
1898 Offset -= FieldOffset;
1900 // Maybe we need to work from the other end.
1901 if (Asm->getDataLayout().isLittleEndian())
1902 Offset = FieldSize - (Offset + Size);
1903 addUInt(MemberDie, dwarf::DW_AT_bit_offset, None, Offset);
1905 // Here WD_AT_data_member_location points to the anonymous
1906 // field that includes this bit field.
1907 OffsetInBytes = FieldOffset >> 3;
1909 // This is not a bitfield.
1910 OffsetInBytes = DT.getOffsetInBits() >> 3;
1911 addUInt(MemberDie, dwarf::DW_AT_data_member_location, None, OffsetInBytes);
1914 if (DT.isProtected())
1915 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1916 dwarf::DW_ACCESS_protected);
1917 else if (DT.isPrivate())
1918 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1919 dwarf::DW_ACCESS_private);
1920 // Otherwise C++ member and base classes are considered public.
1922 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1923 dwarf::DW_ACCESS_public);
1925 addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1,
1926 dwarf::DW_VIRTUALITY_virtual);
1928 // Objective-C properties.
1929 if (MDNode *PNode = DT.getObjCProperty())
1930 if (DIEEntry *PropertyDie = getDIEEntry(PNode))
1931 MemberDie->addValue(dwarf::DW_AT_APPLE_property, dwarf::DW_FORM_ref4,
1934 if (DT.isArtificial())
1935 addFlag(MemberDie, dwarf::DW_AT_artificial);
1938 /// getOrCreateStaticMemberDIE - Create new DIE for C++ static member.
1939 DIE *CompileUnit::getOrCreateStaticMemberDIE(DIDerivedType DT) {
1943 // Construct the context before querying for the existence of the DIE in case
1944 // such construction creates the DIE.
1945 DIE *ContextDIE = getOrCreateContextDIE(resolve(DT.getContext()));
1946 assert(dwarf::isType(ContextDIE->getTag()) &&
1947 "Static member should belong to a type.");
1949 DIE *StaticMemberDIE = getDIE(DT);
1950 if (StaticMemberDIE)
1951 return StaticMemberDIE;
1953 StaticMemberDIE = createAndAddDIE(DT.getTag(), *ContextDIE, DT);
1955 DIType Ty = resolve(DT.getTypeDerivedFrom());
1957 addString(StaticMemberDIE, dwarf::DW_AT_name, DT.getName());
1958 addType(StaticMemberDIE, Ty);
1959 addSourceLine(StaticMemberDIE, DT);
1960 addFlag(StaticMemberDIE, dwarf::DW_AT_external);
1961 addFlag(StaticMemberDIE, dwarf::DW_AT_declaration);
1963 // FIXME: We could omit private if the parent is a class_type, and
1964 // public if the parent is something else.
1965 if (DT.isProtected())
1966 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1967 dwarf::DW_ACCESS_protected);
1968 else if (DT.isPrivate())
1969 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1970 dwarf::DW_ACCESS_private);
1972 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1973 dwarf::DW_ACCESS_public);
1975 if (const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(DT.getConstant()))
1976 addConstantValue(StaticMemberDIE, CI, isUnsignedDIType(DD, Ty));
1977 if (const ConstantFP *CFP = dyn_cast_or_null<ConstantFP>(DT.getConstant()))
1978 addConstantFPValue(StaticMemberDIE, CFP);
1980 return StaticMemberDIE;
1983 void CompileUnit::emitHeader(const MCSection *ASection,
1984 const MCSymbol *ASectionSym) {
1985 Asm->OutStreamer.AddComment("DWARF version number");
1986 Asm->EmitInt16(DD->getDwarfVersion());
1987 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
1988 Asm->EmitSectionOffset(Asm->GetTempSymbol(ASection->getLabelBeginName()),
1990 Asm->OutStreamer.AddComment("Address Size (in bytes)");
1991 Asm->EmitInt8(Asm->getDataLayout().getPointerSize());