1 //===--- DebugInfo.cpp - Debug Information Helper Classes -----------------===//
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 implements the helper classes used to build and interpret debug
11 // information in LLVM IR form.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/IR/DebugInfo.h"
16 #include "LLVMContextImpl.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/SmallPtrSet.h"
19 #include "llvm/ADT/SmallString.h"
20 #include "llvm/Analysis/ValueTracking.h"
21 #include "llvm/IR/Constants.h"
22 #include "llvm/IR/DIBuilder.h"
23 #include "llvm/IR/DerivedTypes.h"
24 #include "llvm/IR/Instructions.h"
25 #include "llvm/IR/IntrinsicInst.h"
26 #include "llvm/IR/Intrinsics.h"
27 #include "llvm/IR/Module.h"
28 #include "llvm/IR/ValueHandle.h"
29 #include "llvm/Support/Debug.h"
30 #include "llvm/Support/Dwarf.h"
31 #include "llvm/Support/raw_ostream.h"
33 using namespace llvm::dwarf;
35 //===----------------------------------------------------------------------===//
37 //===----------------------------------------------------------------------===//
39 bool DIDescriptor::Verify() const {
41 (DIDerivedType(DbgNode).Verify() ||
42 DICompositeType(DbgNode).Verify() || DIBasicType(DbgNode).Verify() ||
43 DIVariable(DbgNode).Verify() || DISubprogram(DbgNode).Verify() ||
44 DIGlobalVariable(DbgNode).Verify() || DIFile(DbgNode).Verify() ||
45 DICompileUnit(DbgNode).Verify() || DINameSpace(DbgNode).Verify() ||
46 DILexicalBlock(DbgNode).Verify() ||
47 DILexicalBlockFile(DbgNode).Verify() ||
48 DISubrange(DbgNode).Verify() || DIEnumerator(DbgNode).Verify() ||
49 DIObjCProperty(DbgNode).Verify() ||
50 DITemplateTypeParameter(DbgNode).Verify() ||
51 DITemplateValueParameter(DbgNode).Verify() ||
52 DIImportedEntity(DbgNode).Verify() || DIExpression(DbgNode).Verify());
55 static Metadata *getField(const MDNode *DbgNode, unsigned Elt) {
56 if (!DbgNode || Elt >= DbgNode->getNumOperands())
58 return DbgNode->getOperand(Elt);
61 static MDNode *getNodeField(const MDNode *DbgNode, unsigned Elt) {
62 return dyn_cast_or_null<MDNode>(getField(DbgNode, Elt));
65 static StringRef getStringField(const MDNode *DbgNode, unsigned Elt) {
66 if (MDString *MDS = dyn_cast_or_null<MDString>(getField(DbgNode, Elt)))
67 return MDS->getString();
71 StringRef DIDescriptor::getStringField(unsigned Elt) const {
72 return ::getStringField(DbgNode, Elt);
75 uint64_t DIDescriptor::getUInt64Field(unsigned Elt) const {
76 if (auto *C = getConstantField(Elt))
77 if (ConstantInt *CI = dyn_cast<ConstantInt>(C))
78 return CI->getZExtValue();
83 int64_t DIDescriptor::getInt64Field(unsigned Elt) const {
84 if (auto *C = getConstantField(Elt))
85 if (ConstantInt *CI = dyn_cast<ConstantInt>(C))
86 return CI->getZExtValue();
91 DIDescriptor DIDescriptor::getDescriptorField(unsigned Elt) const {
92 MDNode *Field = getNodeField(DbgNode, Elt);
93 return DIDescriptor(Field);
96 GlobalVariable *DIDescriptor::getGlobalVariableField(unsigned Elt) const {
97 return dyn_cast_or_null<GlobalVariable>(getConstantField(Elt));
100 Constant *DIDescriptor::getConstantField(unsigned Elt) const {
104 if (Elt < DbgNode->getNumOperands())
106 dyn_cast_or_null<ConstantAsMetadata>(DbgNode->getOperand(Elt)))
107 return C->getValue();
111 Function *DIDescriptor::getFunctionField(unsigned Elt) const {
112 return dyn_cast_or_null<Function>(getConstantField(Elt));
115 void DIDescriptor::replaceFunctionField(unsigned Elt, Function *F) {
119 if (Elt < DbgNode->getNumOperands()) {
120 MDNode *Node = const_cast<MDNode *>(DbgNode);
121 Node->replaceOperandWith(Elt, F ? ConstantAsMetadata::get(F) : nullptr);
125 static unsigned DIVariableInlinedAtIndex = 4;
126 MDNode *DIVariable::getInlinedAt() const {
127 return getNodeField(DbgNode, DIVariableInlinedAtIndex);
130 /// \brief Return the size reported by the variable's type.
131 unsigned DIVariable::getSizeInBits(const DITypeIdentifierMap &Map) {
132 DIType Ty = getType().resolve(Map);
133 // Follow derived types until we reach a type that
134 // reports back a size.
135 while (Ty.isDerivedType() && !Ty.getSizeInBits()) {
136 DIDerivedType DT(&*Ty);
137 Ty = DT.getTypeDerivedFrom().resolve(Map);
139 assert(Ty.getSizeInBits() && "type with size 0");
140 return Ty.getSizeInBits();
143 uint64_t DIExpression::getElement(unsigned Idx) const {
144 unsigned I = Idx + 1;
145 assert(I < getNumHeaderFields() &&
146 "non-existing complex address element requested");
147 return getHeaderFieldAs<int64_t>(I);
150 bool DIExpression::isBitPiece() const {
151 unsigned N = getNumElements();
152 return N >=3 && getElement(N-3) == dwarf::DW_OP_bit_piece;
155 uint64_t DIExpression::getBitPieceOffset() const {
156 assert(isBitPiece() && "not a piece");
157 return getElement(getNumElements()-2);
160 uint64_t DIExpression::getBitPieceSize() const {
161 assert(isBitPiece() && "not a piece");
162 return getElement(getNumElements()-1);
165 DIExpression::iterator DIExpression::begin() const {
166 return DIExpression::iterator(*this);
169 DIExpression::iterator DIExpression::end() const {
170 return DIExpression::iterator();
173 DIExpression::Operand DIExpression::Operand::getNext() const {
178 //===----------------------------------------------------------------------===//
180 //===----------------------------------------------------------------------===//
182 bool DIDescriptor::isSubroutineType() const {
183 return DbgNode && getTag() == dwarf::DW_TAG_subroutine_type;
186 bool DIDescriptor::isBasicType() const {
190 case dwarf::DW_TAG_base_type:
191 case dwarf::DW_TAG_unspecified_type:
198 bool DIDescriptor::isDerivedType() const {
202 case dwarf::DW_TAG_typedef:
203 case dwarf::DW_TAG_pointer_type:
204 case dwarf::DW_TAG_ptr_to_member_type:
205 case dwarf::DW_TAG_reference_type:
206 case dwarf::DW_TAG_rvalue_reference_type:
207 case dwarf::DW_TAG_const_type:
208 case dwarf::DW_TAG_volatile_type:
209 case dwarf::DW_TAG_restrict_type:
210 case dwarf::DW_TAG_member:
211 case dwarf::DW_TAG_inheritance:
212 case dwarf::DW_TAG_friend:
215 // CompositeTypes are currently modelled as DerivedTypes.
216 return isCompositeType();
220 bool DIDescriptor::isCompositeType() const {
224 case dwarf::DW_TAG_array_type:
225 case dwarf::DW_TAG_structure_type:
226 case dwarf::DW_TAG_union_type:
227 case dwarf::DW_TAG_enumeration_type:
228 case dwarf::DW_TAG_subroutine_type:
229 case dwarf::DW_TAG_class_type:
236 bool DIDescriptor::isVariable() const {
240 case dwarf::DW_TAG_auto_variable:
241 case dwarf::DW_TAG_arg_variable:
248 bool DIDescriptor::isType() const {
249 return isBasicType() || isCompositeType() || isDerivedType();
252 bool DIDescriptor::isSubprogram() const {
253 return DbgNode && getTag() == dwarf::DW_TAG_subprogram;
256 bool DIDescriptor::isGlobalVariable() const {
257 return DbgNode && getTag() == dwarf::DW_TAG_variable;
260 bool DIDescriptor::isScope() const {
264 case dwarf::DW_TAG_compile_unit:
265 case dwarf::DW_TAG_lexical_block:
266 case dwarf::DW_TAG_subprogram:
267 case dwarf::DW_TAG_namespace:
268 case dwarf::DW_TAG_file_type:
276 bool DIDescriptor::isTemplateTypeParameter() const {
277 return DbgNode && getTag() == dwarf::DW_TAG_template_type_parameter;
280 bool DIDescriptor::isTemplateValueParameter() const {
281 return DbgNode && (getTag() == dwarf::DW_TAG_template_value_parameter ||
282 getTag() == dwarf::DW_TAG_GNU_template_template_param ||
283 getTag() == dwarf::DW_TAG_GNU_template_parameter_pack);
286 bool DIDescriptor::isCompileUnit() const {
287 return DbgNode && getTag() == dwarf::DW_TAG_compile_unit;
290 bool DIDescriptor::isFile() const {
291 return DbgNode && getTag() == dwarf::DW_TAG_file_type;
294 bool DIDescriptor::isNameSpace() const {
295 return DbgNode && getTag() == dwarf::DW_TAG_namespace;
298 bool DIDescriptor::isLexicalBlockFile() const {
299 return DbgNode && getTag() == dwarf::DW_TAG_lexical_block &&
300 DbgNode->getNumOperands() == 3 && getNumHeaderFields() == 2;
303 bool DIDescriptor::isLexicalBlock() const {
304 // FIXME: There are always exactly 4 header fields in DILexicalBlock, but
305 // something relies on this returning true for DILexicalBlockFile.
306 return DbgNode && getTag() == dwarf::DW_TAG_lexical_block &&
307 DbgNode->getNumOperands() == 3 &&
308 (getNumHeaderFields() == 2 || getNumHeaderFields() == 4);
311 bool DIDescriptor::isSubrange() const {
312 return DbgNode && getTag() == dwarf::DW_TAG_subrange_type;
315 bool DIDescriptor::isEnumerator() const {
316 return DbgNode && getTag() == dwarf::DW_TAG_enumerator;
319 bool DIDescriptor::isObjCProperty() const {
320 return DbgNode && getTag() == dwarf::DW_TAG_APPLE_property;
323 bool DIDescriptor::isImportedEntity() const {
324 return DbgNode && (getTag() == dwarf::DW_TAG_imported_module ||
325 getTag() == dwarf::DW_TAG_imported_declaration);
328 bool DIDescriptor::isExpression() const {
329 return DbgNode && (getTag() == dwarf::DW_TAG_expression);
332 //===----------------------------------------------------------------------===//
333 // Simple Descriptor Constructors and other Methods
334 //===----------------------------------------------------------------------===//
336 void DIDescriptor::replaceAllUsesWith(LLVMContext &VMContext, DIDescriptor D) {
338 assert(DbgNode && "Trying to replace an unverified type!");
340 // Since we use a TrackingVH for the node, its easy for clients to manufacture
341 // legitimate situations where they want to replaceAllUsesWith() on something
342 // which, due to uniquing, has merged with the source. We shield clients from
343 // this detail by allowing a value to be replaced with replaceAllUsesWith()
345 const MDNode *DN = D;
347 SmallVector<Metadata *, 10> Ops(DbgNode->op_begin(), DbgNode->op_end());
348 DN = MDNode::get(VMContext, Ops);
351 assert(DbgNode->isTemporary() && "Expected temporary node");
352 auto *Node = const_cast<MDNode *>(DbgNode);
353 Node->replaceAllUsesWith(const_cast<MDNode *>(DN));
354 MDNode::deleteTemporary(Node);
358 void DIDescriptor::replaceAllUsesWith(MDNode *D) {
359 assert(DbgNode && "Trying to replace an unverified type!");
360 assert(DbgNode != D && "This replacement should always happen");
361 assert(DbgNode->isTemporary() && "Expected temporary node");
362 auto *Node = const_cast<MDNode *>(DbgNode);
363 Node->replaceAllUsesWith(D);
364 MDNode::deleteTemporary(Node);
367 bool DICompileUnit::Verify() const {
368 if (!isCompileUnit())
371 // Don't bother verifying the compilation directory or producer string
372 // as those could be empty.
373 if (getFilename().empty())
376 return DbgNode->getNumOperands() == 7 && getNumHeaderFields() == 8;
379 bool DIObjCProperty::Verify() const {
380 if (!isObjCProperty())
383 // Don't worry about the rest of the strings for now.
384 return DbgNode->getNumOperands() == 3 && getNumHeaderFields() == 6;
387 /// \brief Check if a field at position Elt of a MDNode is a MDNode.
388 static bool fieldIsMDNode(const MDNode *DbgNode, unsigned Elt) {
389 Metadata *Fld = getField(DbgNode, Elt);
390 return !Fld || isa<MDNode>(Fld);
393 /// \brief Check if a field at position Elt of a MDNode is a MDString.
394 static bool fieldIsMDString(const MDNode *DbgNode, unsigned Elt) {
395 Metadata *Fld = getField(DbgNode, Elt);
396 return !Fld || isa<MDString>(Fld);
399 /// \brief Check if a value can be a reference to a type.
400 static bool isTypeRef(const Metadata *MD) {
403 if (auto *S = dyn_cast<MDString>(MD))
404 return !S->getString().empty();
405 if (auto *N = dyn_cast<MDNode>(MD))
406 return DIType(N).isType();
410 /// \brief Check if referenced field might be a type.
411 static bool fieldIsTypeRef(const MDNode *DbgNode, unsigned Elt) {
412 return isTypeRef(dyn_cast_or_null<Metadata>(getField(DbgNode, Elt)));
415 /// \brief Check if a value can be a ScopeRef.
416 static bool isScopeRef(const Metadata *MD) {
419 if (auto *S = dyn_cast<MDString>(MD))
420 return !S->getString().empty();
421 return isa<MDNode>(MD);
424 /// \brief Check if a field at position Elt of a MDNode can be a ScopeRef.
425 static bool fieldIsScopeRef(const MDNode *DbgNode, unsigned Elt) {
426 return isScopeRef(dyn_cast_or_null<Metadata>(getField(DbgNode, Elt)));
429 /// \brief Check if a value can be a DescriptorRef.
430 static bool isDescriptorRef(const Metadata *MD) {
433 if (auto *S = dyn_cast<MDString>(MD))
434 return !S->getString().empty();
435 return isa<MDNode>(MD);
438 bool DIType::Verify() const {
441 // Make sure Context @ field 2 is MDNode.
442 if (!fieldIsScopeRef(DbgNode, 2))
445 // FIXME: Sink this into the various subclass verifies.
446 uint16_t Tag = getTag();
447 if (!isBasicType() && Tag != dwarf::DW_TAG_const_type &&
448 Tag != dwarf::DW_TAG_volatile_type && Tag != dwarf::DW_TAG_pointer_type &&
449 Tag != dwarf::DW_TAG_ptr_to_member_type &&
450 Tag != dwarf::DW_TAG_reference_type &&
451 Tag != dwarf::DW_TAG_rvalue_reference_type &&
452 Tag != dwarf::DW_TAG_restrict_type && Tag != dwarf::DW_TAG_array_type &&
453 Tag != dwarf::DW_TAG_enumeration_type &&
454 Tag != dwarf::DW_TAG_subroutine_type &&
455 Tag != dwarf::DW_TAG_inheritance && Tag != dwarf::DW_TAG_friend &&
456 getFilename().empty())
459 // DIType is abstract, it should be a BasicType, a DerivedType or
462 return DIBasicType(DbgNode).Verify();
463 else if (isCompositeType())
464 return DICompositeType(DbgNode).Verify();
465 else if (isDerivedType())
466 return DIDerivedType(DbgNode).Verify();
471 bool DIBasicType::Verify() const {
472 return isBasicType() && DbgNode->getNumOperands() == 3 &&
473 getNumHeaderFields() == 8;
476 bool DIDerivedType::Verify() const {
477 // Make sure DerivedFrom @ field 3 is TypeRef.
478 if (!fieldIsTypeRef(DbgNode, 3))
480 if (getTag() == dwarf::DW_TAG_ptr_to_member_type)
481 // Make sure ClassType @ field 4 is a TypeRef.
482 if (!fieldIsTypeRef(DbgNode, 4))
485 return isDerivedType() && DbgNode->getNumOperands() >= 4 &&
486 DbgNode->getNumOperands() <= 8 && getNumHeaderFields() >= 7 &&
487 getNumHeaderFields() <= 8;
490 bool DICompositeType::Verify() const {
491 if (!isCompositeType())
494 // Make sure DerivedFrom @ field 3 and ContainingType @ field 5 are TypeRef.
495 if (!fieldIsTypeRef(DbgNode, 3))
497 if (!fieldIsTypeRef(DbgNode, 5))
500 // Make sure the type identifier at field 7 is MDString, it can be null.
501 if (!fieldIsMDString(DbgNode, 7))
504 // A subroutine type can't be both & and &&.
505 if (isLValueReference() && isRValueReference())
508 return DbgNode->getNumOperands() == 8 && getNumHeaderFields() == 8;
511 bool DISubprogram::Verify() const {
515 // Make sure context @ field 2 is a ScopeRef and type @ field 3 is a MDNode.
516 if (!fieldIsScopeRef(DbgNode, 2))
518 if (!fieldIsMDNode(DbgNode, 3))
520 // Containing type @ field 4.
521 if (!fieldIsTypeRef(DbgNode, 4))
524 // A subprogram can't be both & and &&.
525 if (isLValueReference() && isRValueReference())
528 // If a DISubprogram has an llvm::Function*, then scope chains from all
529 // instructions within the function should lead to this DISubprogram.
530 if (auto *F = getFunction()) {
531 for (auto &BB : *F) {
533 DebugLoc DL = I.getDebugLoc();
537 MDNode *Scope = nullptr;
538 MDNode *IA = nullptr;
539 // walk the inlined-at scopes
540 while ((IA = DL.getInlinedAt()))
541 DL = DebugLoc::getFromDILocation(IA);
542 DL.getScopeAndInlinedAt(Scope, IA);
546 while (!DIDescriptor(Scope).isSubprogram()) {
547 DILexicalBlockFile D(Scope);
548 Scope = D.isLexicalBlockFile()
550 : DebugLoc::getFromDILexicalBlock(Scope).getScope();
554 if (!DISubprogram(Scope).describes(F))
559 return DbgNode->getNumOperands() == 9 && getNumHeaderFields() == 12;
562 bool DIGlobalVariable::Verify() const {
563 if (!isGlobalVariable())
566 if (getDisplayName().empty())
568 // Make sure context @ field 1 is an MDNode.
569 if (!fieldIsMDNode(DbgNode, 1))
571 // Make sure that type @ field 3 is a DITypeRef.
572 if (!fieldIsTypeRef(DbgNode, 3))
574 // Make sure StaticDataMemberDeclaration @ field 5 is MDNode.
575 if (!fieldIsMDNode(DbgNode, 5))
578 return DbgNode->getNumOperands() == 6 && getNumHeaderFields() == 7;
581 bool DIVariable::Verify() const {
585 // Make sure context @ field 1 is an MDNode.
586 if (!fieldIsMDNode(DbgNode, 1))
588 // Make sure that type @ field 3 is a DITypeRef.
589 if (!fieldIsTypeRef(DbgNode, 3))
592 // Check the number of header fields, which is common between complex and
594 if (getNumHeaderFields() != 4)
597 // Variable without an inline location.
598 if (DbgNode->getNumOperands() == 4)
601 // Variable with an inline location.
602 return getInlinedAt() != nullptr && DbgNode->getNumOperands() == 5;
605 bool DIExpression::Verify() const {
606 // Empty DIExpressions may be represented as a nullptr.
610 if (!(isExpression() && DbgNode->getNumOperands() == 1))
613 for (auto Op : *this)
615 case DW_OP_bit_piece:
616 // Must be the last element of the expression.
617 return std::distance(Op.getBase(), DIHeaderFieldIterator()) == 3;
619 if (std::distance(Op.getBase(), DIHeaderFieldIterator()) < 2)
625 // Other operators are not yet supported by the backend.
631 bool DILocation::Verify() const {
632 return DbgNode && isa<MDLocation>(DbgNode);
635 bool DINameSpace::Verify() const {
638 return DbgNode->getNumOperands() == 3 && getNumHeaderFields() == 3;
641 MDNode *DIFile::getFileNode() const { return getNodeField(DbgNode, 1); }
643 bool DIFile::Verify() const {
644 return isFile() && DbgNode->getNumOperands() == 2;
647 bool DIEnumerator::Verify() const {
648 return isEnumerator() && DbgNode->getNumOperands() == 1 &&
649 getNumHeaderFields() == 3;
652 bool DISubrange::Verify() const {
653 return isSubrange() && DbgNode->getNumOperands() == 1 &&
654 getNumHeaderFields() == 3;
657 bool DILexicalBlock::Verify() const {
658 return isLexicalBlock() && DbgNode->getNumOperands() == 3 &&
659 getNumHeaderFields() == 4;
662 bool DILexicalBlockFile::Verify() const {
663 return isLexicalBlockFile() && DbgNode->getNumOperands() == 3 &&
664 getNumHeaderFields() == 2;
667 bool DITemplateTypeParameter::Verify() const {
668 return isTemplateTypeParameter() && DbgNode->getNumOperands() == 4 &&
669 getNumHeaderFields() == 4;
672 bool DITemplateValueParameter::Verify() const {
673 return isTemplateValueParameter() && DbgNode->getNumOperands() == 5 &&
674 getNumHeaderFields() == 4;
677 bool DIImportedEntity::Verify() const {
678 return isImportedEntity() && DbgNode->getNumOperands() == 3 &&
679 getNumHeaderFields() == 3;
682 MDNode *DIDerivedType::getObjCProperty() const {
683 return getNodeField(DbgNode, 4);
686 MDString *DICompositeType::getIdentifier() const {
687 return cast_or_null<MDString>(getField(DbgNode, 7));
691 static void VerifySubsetOf(const MDNode *LHS, const MDNode *RHS) {
692 for (unsigned i = 0; i != LHS->getNumOperands(); ++i) {
693 // Skip the 'empty' list (that's a single i32 0, rather than truly empty).
694 if (i == 0 && mdconst::hasa<ConstantInt>(LHS->getOperand(i)))
696 const MDNode *E = cast<MDNode>(LHS->getOperand(i));
698 for (unsigned j = 0; !found && j != RHS->getNumOperands(); ++j)
699 found = (E == cast<MDNode>(RHS->getOperand(j)));
700 assert(found && "Losing a member during member list replacement");
705 void DICompositeType::setArraysHelper(MDNode *Elements, MDNode *TParams) {
706 TrackingMDNodeRef N(*this);
709 // Check that the new list of members contains all the old members as well.
710 if (const MDNode *El = cast_or_null<MDNode>(N->getOperand(4)))
711 VerifySubsetOf(El, Elements);
713 N->replaceOperandWith(4, Elements);
716 N->replaceOperandWith(6, TParams);
720 DIScopeRef DIScope::getRef() const {
721 if (!isCompositeType())
722 return DIScopeRef(*this);
723 DICompositeType DTy(DbgNode);
724 if (!DTy.getIdentifier())
725 return DIScopeRef(*this);
726 return DIScopeRef(DTy.getIdentifier());
729 void DICompositeType::setContainingType(DICompositeType ContainingType) {
730 TrackingMDNodeRef N(*this);
731 N->replaceOperandWith(5, ContainingType.getRef());
735 bool DIVariable::isInlinedFnArgument(const Function *CurFn) {
736 assert(CurFn && "Invalid function");
737 if (!getContext().isSubprogram())
739 // This variable is not inlined function argument if its scope
740 // does not describe current function.
741 return !DISubprogram(getContext()).describes(CurFn);
744 bool DISubprogram::describes(const Function *F) {
745 assert(F && "Invalid function");
746 if (F == getFunction())
748 StringRef Name = getLinkageName();
751 if (F->getName() == Name)
756 MDNode *DISubprogram::getVariablesNodes() const {
757 return getNodeField(DbgNode, 8);
760 DIArray DISubprogram::getVariables() const {
761 return DIArray(getNodeField(DbgNode, 8));
764 Metadata *DITemplateValueParameter::getValue() const {
765 return DbgNode->getOperand(3);
768 DIScopeRef DIScope::getContext() const {
771 return DIType(DbgNode).getContext();
774 return DIScopeRef(DISubprogram(DbgNode).getContext());
776 if (isLexicalBlock())
777 return DIScopeRef(DILexicalBlock(DbgNode).getContext());
779 if (isLexicalBlockFile())
780 return DIScopeRef(DILexicalBlockFile(DbgNode).getContext());
783 return DIScopeRef(DINameSpace(DbgNode).getContext());
785 assert((isFile() || isCompileUnit()) && "Unhandled type of scope.");
786 return DIScopeRef(nullptr);
789 StringRef DIScope::getName() const {
791 return DIType(DbgNode).getName();
793 return DISubprogram(DbgNode).getName();
795 return DINameSpace(DbgNode).getName();
796 assert((isLexicalBlock() || isLexicalBlockFile() || isFile() ||
798 "Unhandled type of scope.");
802 StringRef DIScope::getFilename() const {
805 return ::getStringField(getNodeField(DbgNode, 1), 0);
808 StringRef DIScope::getDirectory() const {
811 return ::getStringField(getNodeField(DbgNode, 1), 1);
814 DIArray DICompileUnit::getEnumTypes() const {
815 if (!DbgNode || DbgNode->getNumOperands() < 7)
818 return DIArray(getNodeField(DbgNode, 2));
821 DIArray DICompileUnit::getRetainedTypes() const {
822 if (!DbgNode || DbgNode->getNumOperands() < 7)
825 return DIArray(getNodeField(DbgNode, 3));
828 DIArray DICompileUnit::getSubprograms() const {
829 if (!DbgNode || DbgNode->getNumOperands() < 7)
832 return DIArray(getNodeField(DbgNode, 4));
835 DIArray DICompileUnit::getGlobalVariables() const {
836 if (!DbgNode || DbgNode->getNumOperands() < 7)
839 return DIArray(getNodeField(DbgNode, 5));
842 DIArray DICompileUnit::getImportedEntities() const {
843 if (!DbgNode || DbgNode->getNumOperands() < 7)
846 return DIArray(getNodeField(DbgNode, 6));
849 void DICompileUnit::replaceSubprograms(DIArray Subprograms) {
850 assert(Verify() && "Expected compile unit");
851 if (Subprograms == getSubprograms())
854 const_cast<MDNode *>(DbgNode)->replaceOperandWith(4, Subprograms);
857 void DICompileUnit::replaceGlobalVariables(DIArray GlobalVariables) {
858 assert(Verify() && "Expected compile unit");
859 if (GlobalVariables == getGlobalVariables())
862 const_cast<MDNode *>(DbgNode)->replaceOperandWith(5, GlobalVariables);
865 DILocation DILocation::copyWithNewScope(LLVMContext &Ctx,
866 DILexicalBlockFile NewScope) {
868 assert(NewScope && "Expected valid scope");
870 const auto *Old = cast<MDLocation>(DbgNode);
871 return DILocation(MDLocation::get(Ctx, Old->getLine(), Old->getColumn(),
872 NewScope, Old->getInlinedAt()));
875 unsigned DILocation::computeNewDiscriminator(LLVMContext &Ctx) {
876 std::pair<const char *, unsigned> Key(getFilename().data(), getLineNumber());
877 return ++Ctx.pImpl->DiscriminatorTable[Key];
880 DIVariable llvm::createInlinedVariable(MDNode *DV, MDNode *InlinedScope,
881 LLVMContext &VMContext) {
882 assert(DIVariable(DV).Verify() && "Expected a DIVariable");
884 return cleanseInlinedVariable(DV, VMContext);
886 // Insert inlined scope.
887 SmallVector<Metadata *, 8> Elts(DV->op_begin(),
888 DV->op_begin() + DIVariableInlinedAtIndex);
889 Elts.push_back(InlinedScope);
891 DIVariable Inlined(MDNode::get(VMContext, Elts));
892 assert(Inlined.Verify() && "Expected to create a DIVariable");
896 DIVariable llvm::cleanseInlinedVariable(MDNode *DV, LLVMContext &VMContext) {
897 assert(DIVariable(DV).Verify() && "Expected a DIVariable");
898 if (!DIVariable(DV).getInlinedAt())
899 return DIVariable(DV);
901 // Remove inlined scope.
902 SmallVector<Metadata *, 8> Elts(DV->op_begin(),
903 DV->op_begin() + DIVariableInlinedAtIndex);
905 DIVariable Cleansed(MDNode::get(VMContext, Elts));
906 assert(Cleansed.Verify() && "Expected to create a DIVariable");
910 DISubprogram llvm::getDISubprogram(const MDNode *Scope) {
911 DIDescriptor D(Scope);
912 if (D.isSubprogram())
913 return DISubprogram(Scope);
915 if (D.isLexicalBlockFile())
916 return getDISubprogram(DILexicalBlockFile(Scope).getContext());
918 if (D.isLexicalBlock())
919 return getDISubprogram(DILexicalBlock(Scope).getContext());
921 return DISubprogram();
924 DISubprogram llvm::getDISubprogram(const Function *F) {
925 // We look for the first instr that has a debug annotation leading back to F.
926 for (auto &BB : *F) {
927 auto Inst = std::find_if(BB.begin(), BB.end(), [](const Instruction &Inst) {
928 return !Inst.getDebugLoc().isUnknown();
930 if (Inst == BB.end())
932 DebugLoc DLoc = Inst->getDebugLoc();
933 const MDNode *Scope = DLoc.getScopeNode();
934 DISubprogram Subprogram = getDISubprogram(Scope);
935 return Subprogram.describes(F) ? Subprogram : DISubprogram();
938 return DISubprogram();
941 DICompositeType llvm::getDICompositeType(DIType T) {
942 if (T.isCompositeType())
943 return DICompositeType(T);
945 if (T.isDerivedType()) {
946 // This function is currently used by dragonegg and dragonegg does
947 // not generate identifier for types, so using an empty map to resolve
948 // DerivedFrom should be fine.
949 DITypeIdentifierMap EmptyMap;
950 return getDICompositeType(
951 DIDerivedType(T).getTypeDerivedFrom().resolve(EmptyMap));
954 return DICompositeType();
958 llvm::generateDITypeIdentifierMap(const NamedMDNode *CU_Nodes) {
959 DITypeIdentifierMap Map;
960 for (unsigned CUi = 0, CUe = CU_Nodes->getNumOperands(); CUi != CUe; ++CUi) {
961 DICompileUnit CU(CU_Nodes->getOperand(CUi));
962 DIArray Retain = CU.getRetainedTypes();
963 for (unsigned Ti = 0, Te = Retain.getNumElements(); Ti != Te; ++Ti) {
964 if (!Retain.getElement(Ti).isCompositeType())
966 DICompositeType Ty(Retain.getElement(Ti));
967 if (MDString *TypeId = Ty.getIdentifier()) {
968 // Definition has priority over declaration.
969 // Try to insert (TypeId, Ty) to Map.
970 std::pair<DITypeIdentifierMap::iterator, bool> P =
971 Map.insert(std::make_pair(TypeId, Ty));
972 // If TypeId already exists in Map and this is a definition, replace
973 // whatever we had (declaration or definition) with the definition.
974 if (!P.second && !Ty.isForwardDecl())
975 P.first->second = Ty;
982 //===----------------------------------------------------------------------===//
983 // DebugInfoFinder implementations.
984 //===----------------------------------------------------------------------===//
986 void DebugInfoFinder::reset() {
993 TypeIdentifierMap.clear();
994 TypeMapInitialized = false;
997 void DebugInfoFinder::InitializeTypeMap(const Module &M) {
998 if (!TypeMapInitialized)
999 if (NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu")) {
1000 TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
1001 TypeMapInitialized = true;
1005 void DebugInfoFinder::processModule(const Module &M) {
1006 InitializeTypeMap(M);
1007 if (NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu")) {
1008 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
1009 DICompileUnit CU(CU_Nodes->getOperand(i));
1011 DIArray GVs = CU.getGlobalVariables();
1012 for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i) {
1013 DIGlobalVariable DIG(GVs.getElement(i));
1014 if (addGlobalVariable(DIG)) {
1015 processScope(DIG.getContext());
1016 processType(DIG.getType().resolve(TypeIdentifierMap));
1019 DIArray SPs = CU.getSubprograms();
1020 for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i)
1021 processSubprogram(DISubprogram(SPs.getElement(i)));
1022 DIArray EnumTypes = CU.getEnumTypes();
1023 for (unsigned i = 0, e = EnumTypes.getNumElements(); i != e; ++i)
1024 processType(DIType(EnumTypes.getElement(i)));
1025 DIArray RetainedTypes = CU.getRetainedTypes();
1026 for (unsigned i = 0, e = RetainedTypes.getNumElements(); i != e; ++i)
1027 processType(DIType(RetainedTypes.getElement(i)));
1028 DIArray Imports = CU.getImportedEntities();
1029 for (unsigned i = 0, e = Imports.getNumElements(); i != e; ++i) {
1030 DIImportedEntity Import = DIImportedEntity(Imports.getElement(i));
1031 DIDescriptor Entity = Import.getEntity().resolve(TypeIdentifierMap);
1032 if (Entity.isType())
1033 processType(DIType(Entity));
1034 else if (Entity.isSubprogram())
1035 processSubprogram(DISubprogram(Entity));
1036 else if (Entity.isNameSpace())
1037 processScope(DINameSpace(Entity).getContext());
1043 void DebugInfoFinder::processLocation(const Module &M, DILocation Loc) {
1046 InitializeTypeMap(M);
1047 processScope(Loc.getScope());
1048 processLocation(M, Loc.getOrigLocation());
1051 void DebugInfoFinder::processType(DIType DT) {
1054 processScope(DT.getContext().resolve(TypeIdentifierMap));
1055 if (DT.isCompositeType()) {
1056 DICompositeType DCT(DT);
1057 processType(DCT.getTypeDerivedFrom().resolve(TypeIdentifierMap));
1058 if (DT.isSubroutineType()) {
1059 DITypeArray DTA = DISubroutineType(DT).getTypeArray();
1060 for (unsigned i = 0, e = DTA.getNumElements(); i != e; ++i)
1061 processType(DTA.getElement(i).resolve(TypeIdentifierMap));
1064 DIArray DA = DCT.getElements();
1065 for (unsigned i = 0, e = DA.getNumElements(); i != e; ++i) {
1066 DIDescriptor D = DA.getElement(i);
1068 processType(DIType(D));
1069 else if (D.isSubprogram())
1070 processSubprogram(DISubprogram(D));
1072 } else if (DT.isDerivedType()) {
1073 DIDerivedType DDT(DT);
1074 processType(DDT.getTypeDerivedFrom().resolve(TypeIdentifierMap));
1078 void DebugInfoFinder::processScope(DIScope Scope) {
1079 if (Scope.isType()) {
1084 if (Scope.isCompileUnit()) {
1085 addCompileUnit(DICompileUnit(Scope));
1088 if (Scope.isSubprogram()) {
1089 processSubprogram(DISubprogram(Scope));
1092 if (!addScope(Scope))
1094 if (Scope.isLexicalBlock()) {
1095 DILexicalBlock LB(Scope);
1096 processScope(LB.getContext());
1097 } else if (Scope.isLexicalBlockFile()) {
1098 DILexicalBlockFile LBF = DILexicalBlockFile(Scope);
1099 processScope(LBF.getScope());
1100 } else if (Scope.isNameSpace()) {
1101 DINameSpace NS(Scope);
1102 processScope(NS.getContext());
1106 void DebugInfoFinder::processSubprogram(DISubprogram SP) {
1107 if (!addSubprogram(SP))
1109 processScope(SP.getContext().resolve(TypeIdentifierMap));
1110 processType(SP.getType());
1111 DIArray TParams = SP.getTemplateParams();
1112 for (unsigned I = 0, E = TParams.getNumElements(); I != E; ++I) {
1113 DIDescriptor Element = TParams.getElement(I);
1114 if (Element.isTemplateTypeParameter()) {
1115 DITemplateTypeParameter TType(Element);
1116 processScope(TType.getContext().resolve(TypeIdentifierMap));
1117 processType(TType.getType().resolve(TypeIdentifierMap));
1118 } else if (Element.isTemplateValueParameter()) {
1119 DITemplateValueParameter TVal(Element);
1120 processScope(TVal.getContext().resolve(TypeIdentifierMap));
1121 processType(TVal.getType().resolve(TypeIdentifierMap));
1126 void DebugInfoFinder::processDeclare(const Module &M,
1127 const DbgDeclareInst *DDI) {
1128 MDNode *N = dyn_cast<MDNode>(DDI->getVariable());
1131 InitializeTypeMap(M);
1134 if (!DV.isVariable())
1137 if (!NodesSeen.insert(DV).second)
1139 processScope(DIVariable(N).getContext());
1140 processType(DIVariable(N).getType().resolve(TypeIdentifierMap));
1143 void DebugInfoFinder::processValue(const Module &M, const DbgValueInst *DVI) {
1144 MDNode *N = dyn_cast<MDNode>(DVI->getVariable());
1147 InitializeTypeMap(M);
1150 if (!DV.isVariable())
1153 if (!NodesSeen.insert(DV).second)
1155 processScope(DIVariable(N).getContext());
1156 processType(DIVariable(N).getType().resolve(TypeIdentifierMap));
1159 bool DebugInfoFinder::addType(DIType DT) {
1163 if (!NodesSeen.insert(DT).second)
1170 bool DebugInfoFinder::addCompileUnit(DICompileUnit CU) {
1173 if (!NodesSeen.insert(CU).second)
1180 bool DebugInfoFinder::addGlobalVariable(DIGlobalVariable DIG) {
1184 if (!NodesSeen.insert(DIG).second)
1191 bool DebugInfoFinder::addSubprogram(DISubprogram SP) {
1195 if (!NodesSeen.insert(SP).second)
1202 bool DebugInfoFinder::addScope(DIScope Scope) {
1205 // FIXME: Ocaml binding generates a scope with no content, we treat it
1207 if (Scope->getNumOperands() == 0)
1209 if (!NodesSeen.insert(Scope).second)
1211 Scopes.push_back(Scope);
1215 //===----------------------------------------------------------------------===//
1216 // DIDescriptor: dump routines for all descriptors.
1217 //===----------------------------------------------------------------------===//
1219 void DIDescriptor::dump() const {
1224 void DIDescriptor::print(raw_ostream &OS) const {
1228 if (const char *Tag = dwarf::TagString(getTag()))
1229 OS << "[ " << Tag << " ]";
1231 if (this->isSubrange()) {
1232 DISubrange(DbgNode).printInternal(OS);
1233 } else if (this->isCompileUnit()) {
1234 DICompileUnit(DbgNode).printInternal(OS);
1235 } else if (this->isFile()) {
1236 DIFile(DbgNode).printInternal(OS);
1237 } else if (this->isEnumerator()) {
1238 DIEnumerator(DbgNode).printInternal(OS);
1239 } else if (this->isBasicType()) {
1240 DIType(DbgNode).printInternal(OS);
1241 } else if (this->isDerivedType()) {
1242 DIDerivedType(DbgNode).printInternal(OS);
1243 } else if (this->isCompositeType()) {
1244 DICompositeType(DbgNode).printInternal(OS);
1245 } else if (this->isSubprogram()) {
1246 DISubprogram(DbgNode).printInternal(OS);
1247 } else if (this->isGlobalVariable()) {
1248 DIGlobalVariable(DbgNode).printInternal(OS);
1249 } else if (this->isVariable()) {
1250 DIVariable(DbgNode).printInternal(OS);
1251 } else if (this->isObjCProperty()) {
1252 DIObjCProperty(DbgNode).printInternal(OS);
1253 } else if (this->isNameSpace()) {
1254 DINameSpace(DbgNode).printInternal(OS);
1255 } else if (this->isScope()) {
1256 DIScope(DbgNode).printInternal(OS);
1257 } else if (this->isExpression()) {
1258 DIExpression(DbgNode).printInternal(OS);
1262 void DISubrange::printInternal(raw_ostream &OS) const {
1263 int64_t Count = getCount();
1265 OS << " [" << getLo() << ", " << Count - 1 << ']';
1267 OS << " [unbounded]";
1270 void DIScope::printInternal(raw_ostream &OS) const {
1271 OS << " [" << getDirectory() << "/" << getFilename() << ']';
1274 void DICompileUnit::printInternal(raw_ostream &OS) const {
1275 DIScope::printInternal(OS);
1277 unsigned Lang = getLanguage();
1278 if (const char *LangStr = dwarf::LanguageString(Lang))
1281 (OS << "lang 0x").write_hex(Lang);
1285 void DIEnumerator::printInternal(raw_ostream &OS) const {
1286 OS << " [" << getName() << " :: " << getEnumValue() << ']';
1289 void DIType::printInternal(raw_ostream &OS) const {
1293 StringRef Res = getName();
1295 OS << " [" << Res << "]";
1297 // TODO: Print context?
1299 OS << " [line " << getLineNumber() << ", size " << getSizeInBits()
1300 << ", align " << getAlignInBits() << ", offset " << getOffsetInBits();
1302 if (const char *Enc =
1303 dwarf::AttributeEncodingString(DIBasicType(DbgNode).getEncoding()))
1304 OS << ", enc " << Enc;
1309 else if (isProtected())
1310 OS << " [protected]";
1311 else if (isPublic())
1315 OS << " [artificial]";
1317 if (isForwardDecl())
1319 else if (getTag() == dwarf::DW_TAG_structure_type ||
1320 getTag() == dwarf::DW_TAG_union_type ||
1321 getTag() == dwarf::DW_TAG_enumeration_type ||
1322 getTag() == dwarf::DW_TAG_class_type)
1326 if (isStaticMember())
1329 if (isLValueReference())
1330 OS << " [reference]";
1332 if (isRValueReference())
1333 OS << " [rvalue reference]";
1336 void DIDerivedType::printInternal(raw_ostream &OS) const {
1337 DIType::printInternal(OS);
1338 OS << " [from " << getTypeDerivedFrom().getName() << ']';
1341 void DICompositeType::printInternal(raw_ostream &OS) const {
1342 DIType::printInternal(OS);
1343 DIArray A = getElements();
1344 OS << " [" << A.getNumElements() << " elements]";
1347 void DINameSpace::printInternal(raw_ostream &OS) const {
1348 StringRef Name = getName();
1350 OS << " [" << Name << ']';
1352 OS << " [line " << getLineNumber() << ']';
1355 void DISubprogram::printInternal(raw_ostream &OS) const {
1356 // TODO : Print context
1357 OS << " [line " << getLineNumber() << ']';
1359 if (isLocalToUnit())
1365 if (getScopeLineNumber() != getLineNumber())
1366 OS << " [scope " << getScopeLineNumber() << "]";
1370 else if (isProtected())
1371 OS << " [protected]";
1372 else if (isPublic())
1375 if (isLValueReference())
1376 OS << " [reference]";
1378 if (isRValueReference())
1379 OS << " [rvalue reference]";
1381 StringRef Res = getName();
1383 OS << " [" << Res << ']';
1386 void DIGlobalVariable::printInternal(raw_ostream &OS) const {
1387 StringRef Res = getName();
1389 OS << " [" << Res << ']';
1391 OS << " [line " << getLineNumber() << ']';
1393 // TODO : Print context
1395 if (isLocalToUnit())
1402 void DIVariable::printInternal(raw_ostream &OS) const {
1403 StringRef Res = getName();
1405 OS << " [" << Res << ']';
1407 OS << " [line " << getLineNumber() << ']';
1410 void DIExpression::printInternal(raw_ostream &OS) const {
1411 for (auto Op : *this) {
1412 OS << " [" << OperationEncodingString(Op);
1415 OS << " " << Op.getArg(1);
1418 case DW_OP_bit_piece: {
1419 OS << " offset=" << Op.getArg(1) << ", size=" << Op.getArg(2);
1426 llvm_unreachable("unhandled operation");
1432 void DIObjCProperty::printInternal(raw_ostream &OS) const {
1433 StringRef Name = getObjCPropertyName();
1435 OS << " [" << Name << ']';
1437 OS << " [line " << getLineNumber() << ", properties " << getUnsignedField(6)
1441 static void printDebugLoc(DebugLoc DL, raw_ostream &CommentOS,
1442 const LLVMContext &Ctx) {
1443 if (!DL.isUnknown()) { // Print source line info.
1444 DIScope Scope(DL.getScope(Ctx));
1445 assert(Scope.isScope() && "Scope of a DebugLoc should be a DIScope.");
1446 // Omit the directory, because it's likely to be long and uninteresting.
1447 CommentOS << Scope.getFilename();
1448 CommentOS << ':' << DL.getLine();
1449 if (DL.getCol() != 0)
1450 CommentOS << ':' << DL.getCol();
1451 DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(DL.getInlinedAt(Ctx));
1452 if (!InlinedAtDL.isUnknown()) {
1453 CommentOS << " @[ ";
1454 printDebugLoc(InlinedAtDL, CommentOS, Ctx);
1460 void DIVariable::printExtendedName(raw_ostream &OS) const {
1461 const LLVMContext &Ctx = DbgNode->getContext();
1462 StringRef Res = getName();
1464 OS << Res << "," << getLineNumber();
1465 if (MDNode *InlinedAt = getInlinedAt()) {
1466 DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(InlinedAt);
1467 if (!InlinedAtDL.isUnknown()) {
1469 printDebugLoc(InlinedAtDL, OS, Ctx);
1475 template <> DIRef<DIDescriptor>::DIRef(const Metadata *V) : Val(V) {
1476 assert(isDescriptorRef(V) &&
1477 "DIDescriptorRef should be a MDString or MDNode");
1479 template <> DIRef<DIScope>::DIRef(const Metadata *V) : Val(V) {
1480 assert(isScopeRef(V) && "DIScopeRef should be a MDString or MDNode");
1482 template <> DIRef<DIType>::DIRef(const Metadata *V) : Val(V) {
1483 assert(isTypeRef(V) && "DITypeRef should be a MDString or MDNode");
1487 DIDescriptorRef DIDescriptor::getFieldAs<DIDescriptorRef>(unsigned Elt) const {
1488 return DIDescriptorRef(cast_or_null<Metadata>(getField(DbgNode, Elt)));
1491 DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const {
1492 return DIScopeRef(cast_or_null<Metadata>(getField(DbgNode, Elt)));
1494 template <> DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const {
1495 return DITypeRef(cast_or_null<Metadata>(getField(DbgNode, Elt)));
1498 bool llvm::StripDebugInfo(Module &M) {
1499 bool Changed = false;
1501 // Remove all of the calls to the debugger intrinsics, and remove them from
1503 if (Function *Declare = M.getFunction("llvm.dbg.declare")) {
1504 while (!Declare->use_empty()) {
1505 CallInst *CI = cast<CallInst>(Declare->user_back());
1506 CI->eraseFromParent();
1508 Declare->eraseFromParent();
1512 if (Function *DbgVal = M.getFunction("llvm.dbg.value")) {
1513 while (!DbgVal->use_empty()) {
1514 CallInst *CI = cast<CallInst>(DbgVal->user_back());
1515 CI->eraseFromParent();
1517 DbgVal->eraseFromParent();
1521 for (Module::named_metadata_iterator NMI = M.named_metadata_begin(),
1522 NME = M.named_metadata_end(); NMI != NME;) {
1523 NamedMDNode *NMD = NMI;
1525 if (NMD->getName().startswith("llvm.dbg.")) {
1526 NMD->eraseFromParent();
1531 for (Module::iterator MI = M.begin(), ME = M.end(); MI != ME; ++MI)
1532 for (Function::iterator FI = MI->begin(), FE = MI->end(); FI != FE;
1534 for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); BI != BE;
1536 if (!BI->getDebugLoc().isUnknown()) {
1538 BI->setDebugLoc(DebugLoc());
1545 unsigned llvm::getDebugMetadataVersionFromModule(const Module &M) {
1546 if (auto *Val = mdconst::dyn_extract_or_null<ConstantInt>(
1547 M.getModuleFlag("Debug Info Version")))
1548 return Val->getZExtValue();
1552 llvm::DenseMap<const llvm::Function *, llvm::DISubprogram>
1553 llvm::makeSubprogramMap(const Module &M) {
1554 DenseMap<const Function *, DISubprogram> R;
1556 NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu");
1560 for (MDNode *N : CU_Nodes->operands()) {
1561 DICompileUnit CUNode(N);
1562 DIArray SPs = CUNode.getSubprograms();
1563 for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i) {
1564 DISubprogram SP(SPs.getElement(i));
1565 if (Function *F = SP.getFunction())
1566 R.insert(std::make_pair(F, SP));