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 constructTypeDIEImpl(*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 constructTypeDIEImpl(*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 // If this is a type applicable to a type unit it then add it to the
1173 // list of types we'll compute a hash for later.
1174 if (shouldCreateTypeUnit(CTy, DD))
1175 DD->addTypeUnitType(&Buffer, CTy);
1177 constructTypeDIEImpl(Buffer, CTy);
1180 void CompileUnit::constructTypeDIEImpl(DIE &Buffer, DICompositeType CTy) {
1181 // Add name if not anonymous or intermediate type.
1182 StringRef Name = CTy.getName();
1184 uint64_t Size = CTy.getSizeInBits() >> 3;
1185 uint16_t Tag = Buffer.getTag();
1188 case dwarf::DW_TAG_array_type:
1189 constructArrayTypeDIE(Buffer, CTy);
1191 case dwarf::DW_TAG_enumeration_type:
1192 constructEnumTypeDIE(Buffer, CTy);
1194 case dwarf::DW_TAG_subroutine_type: {
1195 // Add return type. A void return won't have a type.
1196 DIArray Elements = CTy.getTypeArray();
1197 DIType RTy(Elements.getElement(0));
1199 addType(&Buffer, RTy);
1201 bool isPrototyped = true;
1203 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
1204 DIDescriptor Ty = Elements.getElement(i);
1205 if (Ty.isUnspecifiedParameter()) {
1206 createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
1207 isPrototyped = false;
1209 DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
1210 addType(Arg, DIType(Ty));
1211 if (DIType(Ty).isArtificial())
1212 addFlag(Arg, dwarf::DW_AT_artificial);
1215 // Add prototype flag if we're dealing with a C language and the
1216 // function has been prototyped.
1217 uint16_t Language = getLanguage();
1219 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1220 Language == dwarf::DW_LANG_ObjC))
1221 addFlag(&Buffer, dwarf::DW_AT_prototyped);
1223 case dwarf::DW_TAG_structure_type:
1224 case dwarf::DW_TAG_union_type:
1225 case dwarf::DW_TAG_class_type: {
1226 // Add elements to structure type.
1227 DIArray Elements = CTy.getTypeArray();
1228 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1229 DIDescriptor Element = Elements.getElement(i);
1230 DIE *ElemDie = NULL;
1231 if (Element.isSubprogram()) {
1232 DISubprogram SP(Element);
1233 ElemDie = getOrCreateSubprogramDIE(SP);
1234 if (SP.isProtected())
1235 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1236 dwarf::DW_ACCESS_protected);
1237 else if (SP.isPrivate())
1238 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1239 dwarf::DW_ACCESS_private);
1241 addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1242 dwarf::DW_ACCESS_public);
1243 if (SP.isExplicit())
1244 addFlag(ElemDie, dwarf::DW_AT_explicit);
1245 } else if (Element.isDerivedType()) {
1246 DIDerivedType DDTy(Element);
1247 if (DDTy.getTag() == dwarf::DW_TAG_friend) {
1248 ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
1249 addType(ElemDie, resolve(DDTy.getTypeDerivedFrom()),
1250 dwarf::DW_AT_friend);
1251 } else if (DDTy.isStaticMember()) {
1252 getOrCreateStaticMemberDIE(DDTy);
1254 constructMemberDIE(Buffer, DDTy);
1256 } else if (Element.isObjCProperty()) {
1257 DIObjCProperty Property(Element);
1258 ElemDie = createAndAddDIE(Property.getTag(), Buffer);
1259 StringRef PropertyName = Property.getObjCPropertyName();
1260 addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
1261 addType(ElemDie, Property.getType());
1262 addSourceLine(ElemDie, Property);
1263 StringRef GetterName = Property.getObjCPropertyGetterName();
1264 if (!GetterName.empty())
1265 addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
1266 StringRef SetterName = Property.getObjCPropertySetterName();
1267 if (!SetterName.empty())
1268 addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
1269 unsigned PropertyAttributes = 0;
1270 if (Property.isReadOnlyObjCProperty())
1271 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readonly;
1272 if (Property.isReadWriteObjCProperty())
1273 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readwrite;
1274 if (Property.isAssignObjCProperty())
1275 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_assign;
1276 if (Property.isRetainObjCProperty())
1277 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_retain;
1278 if (Property.isCopyObjCProperty())
1279 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_copy;
1280 if (Property.isNonAtomicObjCProperty())
1281 PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_nonatomic;
1282 if (PropertyAttributes)
1283 addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, None,
1284 PropertyAttributes);
1286 DIEEntry *Entry = getDIEEntry(Element);
1288 Entry = createDIEEntry(ElemDie);
1289 insertDIEEntry(Element, Entry);
1295 if (CTy.isAppleBlockExtension())
1296 addFlag(&Buffer, dwarf::DW_AT_APPLE_block);
1298 DICompositeType ContainingType(resolve(CTy.getContainingType()));
1300 addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
1301 getOrCreateTypeDIE(ContainingType));
1303 if (CTy.isObjcClassComplete())
1304 addFlag(&Buffer, dwarf::DW_AT_APPLE_objc_complete_type);
1306 // Add template parameters to a class, structure or union types.
1307 // FIXME: The support isn't in the metadata for this yet.
1308 if (Tag == dwarf::DW_TAG_class_type ||
1309 Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type)
1310 addTemplateParams(Buffer, CTy.getTemplateParams());
1318 // Add name if not anonymous or intermediate type.
1320 addString(&Buffer, dwarf::DW_AT_name, Name);
1322 if (Tag == dwarf::DW_TAG_enumeration_type ||
1323 Tag == dwarf::DW_TAG_class_type || Tag == dwarf::DW_TAG_structure_type ||
1324 Tag == dwarf::DW_TAG_union_type) {
1325 // Add size if non-zero (derived types might be zero-sized.)
1326 // TODO: Do we care about size for enum forward declarations?
1328 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
1329 else if (!CTy.isForwardDecl())
1330 // Add zero size if it is not a forward declaration.
1331 addUInt(&Buffer, dwarf::DW_AT_byte_size, None, 0);
1333 // If we're a forward decl, say so.
1334 if (CTy.isForwardDecl())
1335 addFlag(&Buffer, dwarf::DW_AT_declaration);
1337 // Add source line info if available.
1338 if (!CTy.isForwardDecl())
1339 addSourceLine(&Buffer, CTy);
1341 // No harm in adding the runtime language to the declaration.
1342 unsigned RLang = CTy.getRunTimeLang();
1344 addUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class, dwarf::DW_FORM_data1,
1349 /// constructTemplateTypeParameterDIE - Construct new DIE for the given
1350 /// DITemplateTypeParameter.
1352 CompileUnit::constructTemplateTypeParameterDIE(DIE &Buffer,
1353 DITemplateTypeParameter TP) {
1355 createAndAddDIE(dwarf::DW_TAG_template_type_parameter, Buffer);
1356 // Add the type if it exists, it could be void and therefore no type.
1358 addType(ParamDIE, resolve(TP.getType()));
1359 if (!TP.getName().empty())
1360 addString(ParamDIE, dwarf::DW_AT_name, TP.getName());
1363 /// constructTemplateValueParameterDIE - Construct new DIE for the given
1364 /// DITemplateValueParameter.
1366 CompileUnit::constructTemplateValueParameterDIE(DIE &Buffer,
1367 DITemplateValueParameter VP) {
1368 DIE *ParamDIE = createAndAddDIE(VP.getTag(), Buffer);
1370 // Add the type if there is one, template template and template parameter
1371 // packs will not have a type.
1372 if (VP.getTag() == dwarf::DW_TAG_template_value_parameter)
1373 addType(ParamDIE, resolve(VP.getType()));
1374 if (!VP.getName().empty())
1375 addString(ParamDIE, dwarf::DW_AT_name, VP.getName());
1376 if (Value *Val = VP.getValue()) {
1377 if (ConstantInt *CI = dyn_cast<ConstantInt>(Val))
1378 addConstantValue(ParamDIE, CI,
1379 isUnsignedDIType(DD, resolve(VP.getType())));
1380 else if (GlobalValue *GV = dyn_cast<GlobalValue>(Val)) {
1381 // For declaration non-type template parameters (such as global values and
1383 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1384 addOpAddress(Block, Asm->getSymbol(GV));
1385 // Emit DW_OP_stack_value to use the address as the immediate value of the
1386 // parameter, rather than a pointer to it.
1387 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
1388 addBlock(ParamDIE, dwarf::DW_AT_location, Block);
1389 } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_template_param) {
1390 assert(isa<MDString>(Val));
1391 addString(ParamDIE, dwarf::DW_AT_GNU_template_name,
1392 cast<MDString>(Val)->getString());
1393 } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_parameter_pack) {
1394 assert(isa<MDNode>(Val));
1395 DIArray A(cast<MDNode>(Val));
1396 addTemplateParams(*ParamDIE, A);
1401 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
1402 DIE *CompileUnit::getOrCreateNameSpace(DINameSpace NS) {
1403 // Construct the context before querying for the existence of the DIE in case
1404 // such construction creates the DIE.
1405 DIE *ContextDIE = getOrCreateContextDIE(NS.getContext());
1407 DIE *NDie = getDIE(NS);
1410 NDie = createAndAddDIE(dwarf::DW_TAG_namespace, *ContextDIE, NS);
1412 if (!NS.getName().empty()) {
1413 addString(NDie, dwarf::DW_AT_name, NS.getName());
1414 addAccelNamespace(NS.getName(), NDie);
1415 addGlobalName(NS.getName(), NDie, NS.getContext());
1417 addAccelNamespace("(anonymous namespace)", NDie);
1418 addSourceLine(NDie, NS);
1422 /// getOrCreateSubprogramDIE - Create new DIE using SP.
1423 DIE *CompileUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
1424 // Construct the context before querying for the existence of the DIE in case
1425 // such construction creates the DIE (as is the case for member function
1427 DIE *ContextDIE = getOrCreateContextDIE(resolve(SP.getContext()));
1429 DIE *SPDie = getDIE(SP);
1433 DISubprogram SPDecl = SP.getFunctionDeclaration();
1434 if (SPDecl.isSubprogram())
1435 // Add subprogram definitions to the CU die directly.
1436 ContextDIE = CUDie.get();
1438 // DW_TAG_inlined_subroutine may refer to this DIE.
1439 SPDie = createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, SP);
1441 DIE *DeclDie = NULL;
1442 if (SPDecl.isSubprogram())
1443 DeclDie = getOrCreateSubprogramDIE(SPDecl);
1445 // Add function template parameters.
1446 addTemplateParams(*SPDie, SP.getTemplateParams());
1448 // If this DIE is going to refer declaration info using AT_specification
1449 // then there is no need to add other attributes.
1451 // Refer function declaration directly.
1452 addDIEEntry(SPDie, dwarf::DW_AT_specification, DeclDie);
1457 // Add the linkage name if we have one.
1458 StringRef LinkageName = SP.getLinkageName();
1459 if (!LinkageName.empty())
1460 addString(SPDie, dwarf::DW_AT_MIPS_linkage_name,
1461 GlobalValue::getRealLinkageName(LinkageName));
1463 // Constructors and operators for anonymous aggregates do not have names.
1464 if (!SP.getName().empty())
1465 addString(SPDie, dwarf::DW_AT_name, SP.getName());
1467 addSourceLine(SPDie, SP);
1469 // Add the prototype if we have a prototype and we have a C like
1471 uint16_t Language = getLanguage();
1472 if (SP.isPrototyped() &&
1473 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1474 Language == dwarf::DW_LANG_ObjC))
1475 addFlag(SPDie, dwarf::DW_AT_prototyped);
1477 DICompositeType SPTy = SP.getType();
1478 assert(SPTy.getTag() == dwarf::DW_TAG_subroutine_type &&
1479 "the type of a subprogram should be a subroutine");
1481 DIArray Args = SPTy.getTypeArray();
1482 // Add a return type. If this is a type like a C/C++ void type we don't add a
1484 if (Args.getElement(0))
1485 addType(SPDie, DIType(Args.getElement(0)));
1487 unsigned VK = SP.getVirtuality();
1489 addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
1490 DIEBlock *Block = getDIEBlock();
1491 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1492 addUInt(Block, dwarf::DW_FORM_udata, SP.getVirtualIndex());
1493 addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, Block);
1494 ContainingTypeMap.insert(
1495 std::make_pair(SPDie, resolve(SP.getContainingType())));
1498 if (!SP.isDefinition()) {
1499 addFlag(SPDie, dwarf::DW_AT_declaration);
1501 // Add arguments. Do not add arguments for subprogram definition. They will
1502 // be handled while processing variables.
1503 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
1504 DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, *SPDie);
1505 DIType ATy(Args.getElement(i));
1507 if (ATy.isArtificial())
1508 addFlag(Arg, dwarf::DW_AT_artificial);
1512 if (SP.isArtificial())
1513 addFlag(SPDie, dwarf::DW_AT_artificial);
1515 if (!SP.isLocalToUnit())
1516 addFlag(SPDie, dwarf::DW_AT_external);
1518 if (SP.isOptimized())
1519 addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);
1521 if (unsigned isa = Asm->getISAEncoding()) {
1522 addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
1528 // Return const expression if value is a GEP to access merged global
1530 // i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
1531 static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
1532 const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
1533 if (!CE || CE->getNumOperands() != 3 ||
1534 CE->getOpcode() != Instruction::GetElementPtr)
1537 // First operand points to a global struct.
1538 Value *Ptr = CE->getOperand(0);
1539 if (!isa<GlobalValue>(Ptr) ||
1540 !isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
1543 // Second operand is zero.
1544 const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
1545 if (!CI || !CI->isZero())
1548 // Third operand is offset.
1549 if (!isa<ConstantInt>(CE->getOperand(2)))
1555 /// createGlobalVariableDIE - create global variable DIE.
1556 void CompileUnit::createGlobalVariableDIE(DIGlobalVariable GV) {
1557 // Check for pre-existence.
1561 if (!GV.isGlobalVariable())
1564 DIScope GVContext = GV.getContext();
1565 DIType GTy = GV.getType();
1567 // If this is a static data member definition, some attributes belong
1568 // to the declaration DIE.
1569 DIE *VariableDIE = NULL;
1570 bool IsStaticMember = false;
1571 DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration();
1572 if (SDMDecl.Verify()) {
1573 assert(SDMDecl.isStaticMember() && "Expected static member decl");
1574 // We need the declaration DIE that is in the static member's class.
1575 VariableDIE = getOrCreateStaticMemberDIE(SDMDecl);
1576 IsStaticMember = true;
1579 // If this is not a static data member definition, create the variable
1580 // DIE and add the initial set of attributes to it.
1582 // Construct the context before querying for the existence of the DIE in
1583 // case such construction creates the DIE.
1584 DIE *ContextDIE = getOrCreateContextDIE(GVContext);
1587 VariableDIE = createAndAddDIE(GV.getTag(), *ContextDIE, GV);
1589 // Add name and type.
1590 addString(VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
1591 addType(VariableDIE, GTy);
1593 // Add scoping info.
1594 if (!GV.isLocalToUnit())
1595 addFlag(VariableDIE, dwarf::DW_AT_external);
1597 // Add line number info.
1598 addSourceLine(VariableDIE, GV);
1602 bool addToAccelTable = false;
1603 DIE *VariableSpecDIE = NULL;
1604 bool isGlobalVariable = GV.getGlobal() != NULL;
1605 if (isGlobalVariable) {
1606 addToAccelTable = true;
1607 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1608 const MCSymbol *Sym = Asm->getSymbol(GV.getGlobal());
1609 if (GV.getGlobal()->isThreadLocal()) {
1610 // FIXME: Make this work with -gsplit-dwarf.
1611 unsigned PointerSize = Asm->getDataLayout().getPointerSize();
1612 assert((PointerSize == 4 || PointerSize == 8) &&
1613 "Add support for other sizes if necessary");
1614 const MCExpr *Expr =
1615 Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym);
1616 // Based on GCC's support for TLS:
1617 if (!DD->useSplitDwarf()) {
1618 // 1) Start with a constNu of the appropriate pointer size
1619 addUInt(Block, dwarf::DW_FORM_data1,
1620 PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
1621 // 2) containing the (relocated) offset of the TLS variable
1622 // within the module's TLS block.
1623 addExpr(Block, dwarf::DW_FORM_udata, Expr);
1625 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
1626 addUInt(Block, dwarf::DW_FORM_udata, DU->getAddrPoolIndex(Expr));
1628 // 3) followed by a custom OP to make the debugger do a TLS lookup.
1629 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
1631 addOpAddress(Block, Sym);
1632 // Do not create specification DIE if context is either compile unit
1634 if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
1635 !GVContext.isFile() && !DD->isSubprogramContext(GVContext)) {
1636 // Create specification DIE.
1637 VariableSpecDIE = createAndAddDIE(dwarf::DW_TAG_variable, *CUDie);
1638 addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification, VariableDIE);
1639 addBlock(VariableSpecDIE, dwarf::DW_AT_location, Block);
1640 // A static member's declaration is already flagged as such.
1641 if (!SDMDecl.Verify())
1642 addFlag(VariableDIE, dwarf::DW_AT_declaration);
1644 addBlock(VariableDIE, dwarf::DW_AT_location, Block);
1646 // Add the linkage name.
1647 StringRef LinkageName = GV.getLinkageName();
1648 if (!LinkageName.empty())
1649 // From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
1650 // TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
1652 addString(IsStaticMember && VariableSpecDIE ? VariableSpecDIE
1654 dwarf::DW_AT_MIPS_linkage_name,
1655 GlobalValue::getRealLinkageName(LinkageName));
1656 } else if (const ConstantInt *CI =
1657 dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
1658 // AT_const_value was added when the static member was created. To avoid
1659 // emitting AT_const_value multiple times, we only add AT_const_value when
1660 // it is not a static member.
1661 if (!IsStaticMember)
1662 addConstantValue(VariableDIE, CI, isUnsignedDIType(DD, GTy));
1663 } else if (const ConstantExpr *CE = getMergedGlobalExpr(GV->getOperand(11))) {
1664 addToAccelTable = true;
1665 // GV is a merged global.
1666 DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
1667 Value *Ptr = CE->getOperand(0);
1668 addOpAddress(Block, Asm->getSymbol(cast<GlobalValue>(Ptr)));
1669 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1670 SmallVector<Value *, 3> Idx(CE->op_begin() + 1, CE->op_end());
1671 addUInt(Block, dwarf::DW_FORM_udata,
1672 Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx));
1673 addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1674 addBlock(VariableDIE, dwarf::DW_AT_location, Block);
1677 if (addToAccelTable) {
1678 DIE *AddrDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
1679 addAccelName(GV.getName(), AddrDIE);
1681 // If the linkage name is different than the name, go ahead and output
1682 // that as well into the name table.
1683 if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
1684 addAccelName(GV.getLinkageName(), AddrDIE);
1687 if (!GV.isLocalToUnit())
1688 addGlobalName(GV.getName(), VariableSpecDIE ? VariableSpecDIE : VariableDIE,
1692 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
1693 void CompileUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR,
1695 DIE *DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
1696 addDIEEntry(DW_Subrange, dwarf::DW_AT_type, IndexTy);
1698 // The LowerBound value defines the lower bounds which is typically zero for
1699 // C/C++. The Count value is the number of elements. Values are 64 bit. If
1700 // Count == -1 then the array is unbounded and we do not emit
1701 // DW_AT_lower_bound and DW_AT_upper_bound attributes. If LowerBound == 0 and
1702 // Count == 0, then the array has zero elements in which case we do not emit
1704 int64_t LowerBound = SR.getLo();
1705 int64_t DefaultLowerBound = getDefaultLowerBound();
1706 int64_t Count = SR.getCount();
1708 if (DefaultLowerBound == -1 || LowerBound != DefaultLowerBound)
1709 addUInt(DW_Subrange, dwarf::DW_AT_lower_bound, None, LowerBound);
1711 if (Count != -1 && Count != 0)
1712 // FIXME: An unbounded array should reference the expression that defines
1714 addUInt(DW_Subrange, dwarf::DW_AT_upper_bound, None,
1715 LowerBound + Count - 1);
1718 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
1719 void CompileUnit::constructArrayTypeDIE(DIE &Buffer, DICompositeType CTy) {
1721 addFlag(&Buffer, dwarf::DW_AT_GNU_vector);
1723 // Emit the element type.
1724 addType(&Buffer, resolve(CTy.getTypeDerivedFrom()));
1726 // Get an anonymous type for index type.
1727 // FIXME: This type should be passed down from the front end
1728 // as different languages may have different sizes for indexes.
1729 DIE *IdxTy = getIndexTyDie();
1731 // Construct an anonymous type for index type.
1732 IdxTy = createAndAddDIE(dwarf::DW_TAG_base_type, *CUDie.get());
1733 addString(IdxTy, dwarf::DW_AT_name, "int");
1734 addUInt(IdxTy, dwarf::DW_AT_byte_size, None, sizeof(int32_t));
1735 addUInt(IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1736 dwarf::DW_ATE_signed);
1737 setIndexTyDie(IdxTy);
1740 // Add subranges to array type.
1741 DIArray Elements = CTy.getTypeArray();
1742 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1743 DIDescriptor Element = Elements.getElement(i);
1744 if (Element.getTag() == dwarf::DW_TAG_subrange_type)
1745 constructSubrangeDIE(Buffer, DISubrange(Element), IdxTy);
1749 /// constructEnumTypeDIE - Construct an enum type DIE from DICompositeType.
1750 void CompileUnit::constructEnumTypeDIE(DIE &Buffer, DICompositeType CTy) {
1751 DIArray Elements = CTy.getTypeArray();
1753 // Add enumerators to enumeration type.
1754 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1755 DIEnumerator Enum(Elements.getElement(i));
1756 if (Enum.isEnumerator()) {
1757 DIE *Enumerator = createAndAddDIE(dwarf::DW_TAG_enumerator, Buffer);
1758 StringRef Name = Enum.getName();
1759 addString(Enumerator, dwarf::DW_AT_name, Name);
1760 int64_t Value = Enum.getEnumValue();
1761 addSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata,
1765 DIType DTy = resolve(CTy.getTypeDerivedFrom());
1767 addType(&Buffer, DTy);
1768 addFlag(&Buffer, dwarf::DW_AT_enum_class);
1772 /// constructContainingTypeDIEs - Construct DIEs for types that contain
1774 void CompileUnit::constructContainingTypeDIEs() {
1775 for (DenseMap<DIE *, const MDNode *>::iterator CI = ContainingTypeMap.begin(),
1776 CE = ContainingTypeMap.end();
1778 DIE *SPDie = CI->first;
1779 DIDescriptor D(CI->second);
1782 DIE *NDie = getDIE(D);
1785 addDIEEntry(SPDie, dwarf::DW_AT_containing_type, NDie);
1789 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
1790 DIE *CompileUnit::constructVariableDIE(DbgVariable &DV, bool isScopeAbstract) {
1791 StringRef Name = DV.getName();
1793 // Define variable debug information entry.
1794 DIE *VariableDie = new DIE(DV.getTag());
1795 DbgVariable *AbsVar = DV.getAbstractVariable();
1796 DIE *AbsDIE = AbsVar ? AbsVar->getDIE() : NULL;
1798 addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin, AbsDIE);
1801 addString(VariableDie, dwarf::DW_AT_name, Name);
1802 addSourceLine(VariableDie, DV.getVariable());
1803 addType(VariableDie, DV.getType());
1806 if (DV.isArtificial())
1807 addFlag(VariableDie, dwarf::DW_AT_artificial);
1809 if (isScopeAbstract) {
1810 DV.setDIE(VariableDie);
1814 // Add variable address.
1816 unsigned Offset = DV.getDotDebugLocOffset();
1817 if (Offset != ~0U) {
1818 addSectionLabel(VariableDie, dwarf::DW_AT_location,
1819 Asm->GetTempSymbol("debug_loc", Offset));
1820 DV.setDIE(VariableDie);
1824 // Check if variable is described by a DBG_VALUE instruction.
1825 if (const MachineInstr *DVInsn = DV.getMInsn()) {
1826 assert(DVInsn->getNumOperands() == 3);
1827 if (DVInsn->getOperand(0).isReg()) {
1828 const MachineOperand RegOp = DVInsn->getOperand(0);
1829 // If the second operand is an immediate, this is an indirect value.
1830 if (DVInsn->getOperand(1).isImm()) {
1831 MachineLocation Location(RegOp.getReg(),
1832 DVInsn->getOperand(1).getImm());
1833 addVariableAddress(DV, VariableDie, Location);
1834 } else if (RegOp.getReg())
1835 addVariableAddress(DV, VariableDie, MachineLocation(RegOp.getReg()));
1836 } else if (DVInsn->getOperand(0).isImm())
1837 addConstantValue(VariableDie, DVInsn->getOperand(0), DV.getType());
1838 else if (DVInsn->getOperand(0).isFPImm())
1839 addConstantFPValue(VariableDie, DVInsn->getOperand(0));
1840 else if (DVInsn->getOperand(0).isCImm())
1841 addConstantValue(VariableDie, DVInsn->getOperand(0).getCImm(),
1842 isUnsignedDIType(DD, DV.getType()));
1844 DV.setDIE(VariableDie);
1847 // .. else use frame index.
1848 int FI = DV.getFrameIndex();
1850 unsigned FrameReg = 0;
1851 const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
1852 int Offset = TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
1853 MachineLocation Location(FrameReg, Offset);
1854 addVariableAddress(DV, VariableDie, Location);
1858 DV.setDIE(VariableDie);
1862 /// constructMemberDIE - Construct member DIE from DIDerivedType.
1863 void CompileUnit::constructMemberDIE(DIE &Buffer, DIDerivedType DT) {
1864 DIE *MemberDie = createAndAddDIE(DT.getTag(), Buffer);
1865 StringRef Name = DT.getName();
1867 addString(MemberDie, dwarf::DW_AT_name, Name);
1869 addType(MemberDie, resolve(DT.getTypeDerivedFrom()));
1871 addSourceLine(MemberDie, DT);
1873 DIEBlock *MemLocationDie = new (DIEValueAllocator) DIEBlock();
1874 addUInt(MemLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
1876 if (DT.getTag() == dwarf::DW_TAG_inheritance && DT.isVirtual()) {
1878 // For C++, virtual base classes are not at fixed offset. Use following
1879 // expression to extract appropriate offset from vtable.
1880 // BaseAddr = ObAddr + *((*ObAddr) - Offset)
1882 DIEBlock *VBaseLocationDie = new (DIEValueAllocator) DIEBlock();
1883 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
1884 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1885 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1886 addUInt(VBaseLocationDie, dwarf::DW_FORM_udata, DT.getOffsetInBits());
1887 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
1888 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1889 addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1891 addBlock(MemberDie, dwarf::DW_AT_data_member_location, VBaseLocationDie);
1893 uint64_t Size = DT.getSizeInBits();
1894 uint64_t FieldSize = getBaseTypeSize(DD, DT);
1895 uint64_t OffsetInBytes;
1897 if (Size != FieldSize) {
1899 addUInt(MemberDie, dwarf::DW_AT_byte_size, None,
1900 getBaseTypeSize(DD, DT) >> 3);
1901 addUInt(MemberDie, dwarf::DW_AT_bit_size, None, DT.getSizeInBits());
1903 uint64_t Offset = DT.getOffsetInBits();
1904 uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
1905 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1906 uint64_t FieldOffset = (HiMark - FieldSize);
1907 Offset -= FieldOffset;
1909 // Maybe we need to work from the other end.
1910 if (Asm->getDataLayout().isLittleEndian())
1911 Offset = FieldSize - (Offset + Size);
1912 addUInt(MemberDie, dwarf::DW_AT_bit_offset, None, Offset);
1914 // Here WD_AT_data_member_location points to the anonymous
1915 // field that includes this bit field.
1916 OffsetInBytes = FieldOffset >> 3;
1918 // This is not a bitfield.
1919 OffsetInBytes = DT.getOffsetInBits() >> 3;
1920 addUInt(MemberDie, dwarf::DW_AT_data_member_location, None, OffsetInBytes);
1923 if (DT.isProtected())
1924 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1925 dwarf::DW_ACCESS_protected);
1926 else if (DT.isPrivate())
1927 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1928 dwarf::DW_ACCESS_private);
1929 // Otherwise C++ member and base classes are considered public.
1931 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1932 dwarf::DW_ACCESS_public);
1934 addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1,
1935 dwarf::DW_VIRTUALITY_virtual);
1937 // Objective-C properties.
1938 if (MDNode *PNode = DT.getObjCProperty())
1939 if (DIEEntry *PropertyDie = getDIEEntry(PNode))
1940 MemberDie->addValue(dwarf::DW_AT_APPLE_property, dwarf::DW_FORM_ref4,
1943 if (DT.isArtificial())
1944 addFlag(MemberDie, dwarf::DW_AT_artificial);
1947 /// getOrCreateStaticMemberDIE - Create new DIE for C++ static member.
1948 DIE *CompileUnit::getOrCreateStaticMemberDIE(DIDerivedType DT) {
1952 // Construct the context before querying for the existence of the DIE in case
1953 // such construction creates the DIE.
1954 DIE *ContextDIE = getOrCreateContextDIE(resolve(DT.getContext()));
1955 assert(dwarf::isType(ContextDIE->getTag()) &&
1956 "Static member should belong to a type.");
1958 DIE *StaticMemberDIE = getDIE(DT);
1959 if (StaticMemberDIE)
1960 return StaticMemberDIE;
1962 StaticMemberDIE = createAndAddDIE(DT.getTag(), *ContextDIE, DT);
1964 DIType Ty = resolve(DT.getTypeDerivedFrom());
1966 addString(StaticMemberDIE, dwarf::DW_AT_name, DT.getName());
1967 addType(StaticMemberDIE, Ty);
1968 addSourceLine(StaticMemberDIE, DT);
1969 addFlag(StaticMemberDIE, dwarf::DW_AT_external);
1970 addFlag(StaticMemberDIE, dwarf::DW_AT_declaration);
1972 // FIXME: We could omit private if the parent is a class_type, and
1973 // public if the parent is something else.
1974 if (DT.isProtected())
1975 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1976 dwarf::DW_ACCESS_protected);
1977 else if (DT.isPrivate())
1978 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1979 dwarf::DW_ACCESS_private);
1981 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1982 dwarf::DW_ACCESS_public);
1984 if (const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(DT.getConstant()))
1985 addConstantValue(StaticMemberDIE, CI, isUnsignedDIType(DD, Ty));
1986 if (const ConstantFP *CFP = dyn_cast_or_null<ConstantFP>(DT.getConstant()))
1987 addConstantFPValue(StaticMemberDIE, CFP);
1989 return StaticMemberDIE;
1992 void CompileUnit::emitHeader(const MCSection *ASection,
1993 const MCSymbol *ASectionSym) {
1994 Asm->OutStreamer.AddComment("DWARF version number");
1995 Asm->EmitInt16(DD->getDwarfVersion());
1996 Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
1997 Asm->EmitSectionOffset(Asm->GetTempSymbol(ASection->getLabelBeginName()),
1999 Asm->OutStreamer.AddComment("Address Size (in bytes)");
2000 Asm->EmitInt8(Asm->getDataLayout().getPointerSize());