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::isVariablePiece() const {
151 return getNumElements() && getElement(0) == dwarf::DW_OP_piece;
154 uint64_t DIExpression::getPieceOffset() const {
155 assert(isVariablePiece());
156 return getElement(1);
159 uint64_t DIExpression::getPieceSize() const {
160 assert(isVariablePiece());
161 return getElement(2);
164 //===----------------------------------------------------------------------===//
166 //===----------------------------------------------------------------------===//
168 bool DIDescriptor::isSubroutineType() const {
169 return DbgNode && getTag() == dwarf::DW_TAG_subroutine_type;
172 bool DIDescriptor::isBasicType() const {
176 case dwarf::DW_TAG_base_type:
177 case dwarf::DW_TAG_unspecified_type:
184 bool DIDescriptor::isDerivedType() const {
188 case dwarf::DW_TAG_typedef:
189 case dwarf::DW_TAG_pointer_type:
190 case dwarf::DW_TAG_ptr_to_member_type:
191 case dwarf::DW_TAG_reference_type:
192 case dwarf::DW_TAG_rvalue_reference_type:
193 case dwarf::DW_TAG_const_type:
194 case dwarf::DW_TAG_volatile_type:
195 case dwarf::DW_TAG_restrict_type:
196 case dwarf::DW_TAG_member:
197 case dwarf::DW_TAG_inheritance:
198 case dwarf::DW_TAG_friend:
201 // CompositeTypes are currently modelled as DerivedTypes.
202 return isCompositeType();
206 bool DIDescriptor::isCompositeType() const {
210 case dwarf::DW_TAG_array_type:
211 case dwarf::DW_TAG_structure_type:
212 case dwarf::DW_TAG_union_type:
213 case dwarf::DW_TAG_enumeration_type:
214 case dwarf::DW_TAG_subroutine_type:
215 case dwarf::DW_TAG_class_type:
222 bool DIDescriptor::isVariable() const {
226 case dwarf::DW_TAG_auto_variable:
227 case dwarf::DW_TAG_arg_variable:
234 bool DIDescriptor::isType() const {
235 return isBasicType() || isCompositeType() || isDerivedType();
238 bool DIDescriptor::isSubprogram() const {
239 return DbgNode && getTag() == dwarf::DW_TAG_subprogram;
242 bool DIDescriptor::isGlobalVariable() const {
243 return DbgNode && (getTag() == dwarf::DW_TAG_variable ||
244 getTag() == dwarf::DW_TAG_constant);
247 bool DIDescriptor::isScope() const {
251 case dwarf::DW_TAG_compile_unit:
252 case dwarf::DW_TAG_lexical_block:
253 case dwarf::DW_TAG_subprogram:
254 case dwarf::DW_TAG_namespace:
255 case dwarf::DW_TAG_file_type:
263 bool DIDescriptor::isTemplateTypeParameter() const {
264 return DbgNode && getTag() == dwarf::DW_TAG_template_type_parameter;
267 bool DIDescriptor::isTemplateValueParameter() const {
268 return DbgNode && (getTag() == dwarf::DW_TAG_template_value_parameter ||
269 getTag() == dwarf::DW_TAG_GNU_template_template_param ||
270 getTag() == dwarf::DW_TAG_GNU_template_parameter_pack);
273 bool DIDescriptor::isCompileUnit() const {
274 return DbgNode && getTag() == dwarf::DW_TAG_compile_unit;
277 bool DIDescriptor::isFile() const {
278 return DbgNode && getTag() == dwarf::DW_TAG_file_type;
281 bool DIDescriptor::isNameSpace() const {
282 return DbgNode && getTag() == dwarf::DW_TAG_namespace;
285 bool DIDescriptor::isLexicalBlockFile() const {
286 return DbgNode && getTag() == dwarf::DW_TAG_lexical_block &&
287 DbgNode->getNumOperands() == 3 && getNumHeaderFields() == 2;
290 bool DIDescriptor::isLexicalBlock() const {
291 // FIXME: There are always exactly 4 header fields in DILexicalBlock, but
292 // something relies on this returning true for DILexicalBlockFile.
293 return DbgNode && getTag() == dwarf::DW_TAG_lexical_block &&
294 DbgNode->getNumOperands() == 3 &&
295 (getNumHeaderFields() == 2 || getNumHeaderFields() == 4);
298 bool DIDescriptor::isSubrange() const {
299 return DbgNode && getTag() == dwarf::DW_TAG_subrange_type;
302 bool DIDescriptor::isEnumerator() const {
303 return DbgNode && getTag() == dwarf::DW_TAG_enumerator;
306 bool DIDescriptor::isObjCProperty() const {
307 return DbgNode && getTag() == dwarf::DW_TAG_APPLE_property;
310 bool DIDescriptor::isImportedEntity() const {
311 return DbgNode && (getTag() == dwarf::DW_TAG_imported_module ||
312 getTag() == dwarf::DW_TAG_imported_declaration);
315 bool DIDescriptor::isExpression() const {
316 return DbgNode && (getTag() == dwarf::DW_TAG_expression);
319 //===----------------------------------------------------------------------===//
320 // Simple Descriptor Constructors and other Methods
321 //===----------------------------------------------------------------------===//
323 void DIDescriptor::replaceAllUsesWith(LLVMContext &VMContext, DIDescriptor D) {
325 assert(DbgNode && "Trying to replace an unverified type!");
327 // Since we use a TrackingVH for the node, its easy for clients to manufacture
328 // legitimate situations where they want to replaceAllUsesWith() on something
329 // which, due to uniquing, has merged with the source. We shield clients from
330 // this detail by allowing a value to be replaced with replaceAllUsesWith()
332 const MDNode *DN = D;
334 SmallVector<Metadata *, 10> Ops(DbgNode->getNumOperands());
335 for (size_t i = 0; i != Ops.size(); ++i)
336 Ops[i] = DbgNode->getOperand(i);
337 DN = MDNode::get(VMContext, Ops);
340 auto *Node = cast<MDNodeFwdDecl>(const_cast<MDNode *>(DbgNode));
341 Node->replaceAllUsesWith(const_cast<MDNode *>(DN));
342 MDNode::deleteTemporary(Node);
346 void DIDescriptor::replaceAllUsesWith(MDNode *D) {
347 assert(DbgNode && "Trying to replace an unverified type!");
348 assert(DbgNode != D && "This replacement should always happen");
349 auto *Node = cast<MDNodeFwdDecl>(const_cast<MDNode *>(DbgNode));
350 Node->replaceAllUsesWith(D);
351 MDNode::deleteTemporary(Node);
354 bool DICompileUnit::Verify() const {
355 if (!isCompileUnit())
358 // Don't bother verifying the compilation directory or producer string
359 // as those could be empty.
360 if (getFilename().empty())
363 return DbgNode->getNumOperands() == 7 && getNumHeaderFields() == 8;
366 bool DIObjCProperty::Verify() const {
367 if (!isObjCProperty())
370 // Don't worry about the rest of the strings for now.
371 return DbgNode->getNumOperands() == 3 && getNumHeaderFields() == 6;
374 /// \brief Check if a field at position Elt of a MDNode is a MDNode.
376 /// We currently allow an empty string and an integer.
377 /// But we don't allow a non-empty string in a MDNode field.
378 static bool fieldIsMDNode(const MDNode *DbgNode, unsigned Elt) {
379 // FIXME: This function should return true, if the field is null or the field
380 // is indeed a MDNode: return !Fld || isa<MDNode>(Fld).
381 Metadata *Fld = getField(DbgNode, Elt);
382 if (Fld && isa<MDString>(Fld) && !cast<MDString>(Fld)->getString().empty())
387 /// \brief Check if a field at position Elt of a MDNode is a MDString.
388 static bool fieldIsMDString(const MDNode *DbgNode, unsigned Elt) {
389 Metadata *Fld = getField(DbgNode, Elt);
390 return !Fld || isa<MDString>(Fld);
393 /// \brief Check if a value can be a reference to a type.
394 static bool isTypeRef(const Metadata *MD) {
397 if (auto *S = dyn_cast<MDString>(MD))
398 return !S->getString().empty();
399 if (auto *N = dyn_cast<MDNode>(MD))
400 return DIType(N).isType();
404 /// \brief Check if referenced field might be a type.
405 static bool fieldIsTypeRef(const MDNode *DbgNode, unsigned Elt) {
406 return isTypeRef(dyn_cast_or_null<Metadata>(getField(DbgNode, Elt)));
409 /// \brief Check if a value can be a ScopeRef.
410 static bool isScopeRef(const Metadata *MD) {
413 if (auto *S = dyn_cast<MDString>(MD))
414 return !S->getString().empty();
415 return isa<MDNode>(MD);
418 /// \brief Check if a field at position Elt of a MDNode can be a ScopeRef.
419 static bool fieldIsScopeRef(const MDNode *DbgNode, unsigned Elt) {
420 return isScopeRef(dyn_cast_or_null<Metadata>(getField(DbgNode, Elt)));
423 bool DIType::Verify() const {
426 // Make sure Context @ field 2 is MDNode.
427 if (!fieldIsScopeRef(DbgNode, 2))
430 // FIXME: Sink this into the various subclass verifies.
431 uint16_t Tag = getTag();
432 if (!isBasicType() && Tag != dwarf::DW_TAG_const_type &&
433 Tag != dwarf::DW_TAG_volatile_type && Tag != dwarf::DW_TAG_pointer_type &&
434 Tag != dwarf::DW_TAG_ptr_to_member_type &&
435 Tag != dwarf::DW_TAG_reference_type &&
436 Tag != dwarf::DW_TAG_rvalue_reference_type &&
437 Tag != dwarf::DW_TAG_restrict_type && Tag != dwarf::DW_TAG_array_type &&
438 Tag != dwarf::DW_TAG_enumeration_type &&
439 Tag != dwarf::DW_TAG_subroutine_type &&
440 Tag != dwarf::DW_TAG_inheritance && Tag != dwarf::DW_TAG_friend &&
441 getFilename().empty())
444 // DIType is abstract, it should be a BasicType, a DerivedType or
447 return DIBasicType(DbgNode).Verify();
448 else if (isCompositeType())
449 return DICompositeType(DbgNode).Verify();
450 else if (isDerivedType())
451 return DIDerivedType(DbgNode).Verify();
456 bool DIBasicType::Verify() const {
457 return isBasicType() && DbgNode->getNumOperands() == 3 &&
458 getNumHeaderFields() == 8;
461 bool DIDerivedType::Verify() const {
462 // Make sure DerivedFrom @ field 3 is TypeRef.
463 if (!fieldIsTypeRef(DbgNode, 3))
465 if (getTag() == dwarf::DW_TAG_ptr_to_member_type)
466 // Make sure ClassType @ field 4 is a TypeRef.
467 if (!fieldIsTypeRef(DbgNode, 4))
470 return isDerivedType() && DbgNode->getNumOperands() >= 4 &&
471 DbgNode->getNumOperands() <= 8 && getNumHeaderFields() >= 7 &&
472 getNumHeaderFields() <= 8;
475 bool DICompositeType::Verify() const {
476 if (!isCompositeType())
479 // Make sure DerivedFrom @ field 3 and ContainingType @ field 5 are TypeRef.
480 if (!fieldIsTypeRef(DbgNode, 3))
482 if (!fieldIsTypeRef(DbgNode, 5))
485 // Make sure the type identifier at field 7 is MDString, it can be null.
486 if (!fieldIsMDString(DbgNode, 7))
489 // A subroutine type can't be both & and &&.
490 if (isLValueReference() && isRValueReference())
493 return DbgNode->getNumOperands() == 8 && getNumHeaderFields() == 8;
496 bool DISubprogram::Verify() const {
500 // Make sure context @ field 2 is a ScopeRef and type @ field 3 is a MDNode.
501 if (!fieldIsScopeRef(DbgNode, 2))
503 if (!fieldIsMDNode(DbgNode, 3))
505 // Containing type @ field 4.
506 if (!fieldIsTypeRef(DbgNode, 4))
509 // A subprogram can't be both & and &&.
510 if (isLValueReference() && isRValueReference())
513 // If a DISubprogram has an llvm::Function*, then scope chains from all
514 // instructions within the function should lead to this DISubprogram.
515 if (auto *F = getFunction()) {
516 for (auto &BB : *F) {
518 DebugLoc DL = I.getDebugLoc();
522 MDNode *Scope = nullptr;
523 MDNode *IA = nullptr;
524 // walk the inlined-at scopes
525 while ((IA = DL.getInlinedAt()))
526 DL = DebugLoc::getFromDILocation(IA);
527 DL.getScopeAndInlinedAt(Scope, IA);
529 while (!DIDescriptor(Scope).isSubprogram()) {
530 DILexicalBlockFile D(Scope);
531 Scope = D.isLexicalBlockFile()
533 : DebugLoc::getFromDILexicalBlock(Scope).getScope();
535 if (!DISubprogram(Scope).describes(F))
540 return DbgNode->getNumOperands() == 9 && getNumHeaderFields() == 12;
543 bool DIGlobalVariable::Verify() const {
544 if (!isGlobalVariable())
547 if (getDisplayName().empty())
549 // Make sure context @ field 1 is an MDNode.
550 if (!fieldIsMDNode(DbgNode, 1))
552 // Make sure that type @ field 3 is a DITypeRef.
553 if (!fieldIsTypeRef(DbgNode, 3))
555 // Make sure StaticDataMemberDeclaration @ field 5 is MDNode.
556 if (!fieldIsMDNode(DbgNode, 5))
559 return DbgNode->getNumOperands() == 6 && getNumHeaderFields() == 7;
562 bool DIVariable::Verify() const {
566 // Make sure context @ field 1 is an MDNode.
567 if (!fieldIsMDNode(DbgNode, 1))
569 // Make sure that type @ field 3 is a DITypeRef.
570 if (!fieldIsTypeRef(DbgNode, 3))
573 // Check the number of header fields, which is common between complex and
575 if (getNumHeaderFields() != 4)
578 // Variable without an inline location.
579 if (DbgNode->getNumOperands() == 4)
582 // Variable with an inline location.
583 return getInlinedAt() != nullptr && DbgNode->getNumOperands() == 5;
586 bool DIExpression::Verify() const {
587 // Empty DIExpressions may be represented as a nullptr.
591 return isExpression() && DbgNode->getNumOperands() == 1;
594 bool DILocation::Verify() const {
595 return DbgNode && isa<MDLocation>(DbgNode);
598 bool DINameSpace::Verify() const {
601 return DbgNode->getNumOperands() == 3 && getNumHeaderFields() == 3;
604 MDNode *DIFile::getFileNode() const { return getNodeField(DbgNode, 1); }
606 bool DIFile::Verify() const {
607 return isFile() && DbgNode->getNumOperands() == 2;
610 bool DIEnumerator::Verify() const {
611 return isEnumerator() && DbgNode->getNumOperands() == 1 &&
612 getNumHeaderFields() == 3;
615 bool DISubrange::Verify() const {
616 return isSubrange() && DbgNode->getNumOperands() == 1 &&
617 getNumHeaderFields() == 3;
620 bool DILexicalBlock::Verify() const {
621 return isLexicalBlock() && DbgNode->getNumOperands() == 3 &&
622 getNumHeaderFields() == 4;
625 bool DILexicalBlockFile::Verify() const {
626 return isLexicalBlockFile() && DbgNode->getNumOperands() == 3 &&
627 getNumHeaderFields() == 2;
630 bool DITemplateTypeParameter::Verify() const {
631 return isTemplateTypeParameter() && DbgNode->getNumOperands() == 4 &&
632 getNumHeaderFields() == 4;
635 bool DITemplateValueParameter::Verify() const {
636 return isTemplateValueParameter() && DbgNode->getNumOperands() == 5 &&
637 getNumHeaderFields() == 4;
640 bool DIImportedEntity::Verify() const {
641 return isImportedEntity() && DbgNode->getNumOperands() == 3 &&
642 getNumHeaderFields() == 3;
645 MDNode *DIDerivedType::getObjCProperty() const {
646 return getNodeField(DbgNode, 4);
649 MDString *DICompositeType::getIdentifier() const {
650 return cast_or_null<MDString>(getField(DbgNode, 7));
654 static void VerifySubsetOf(const MDNode *LHS, const MDNode *RHS) {
655 for (unsigned i = 0; i != LHS->getNumOperands(); ++i) {
656 // Skip the 'empty' list (that's a single i32 0, rather than truly empty).
657 if (i == 0 && mdconst::hasa<ConstantInt>(LHS->getOperand(i)))
659 const MDNode *E = cast<MDNode>(LHS->getOperand(i));
661 for (unsigned j = 0; !found && j != RHS->getNumOperands(); ++j)
662 found = (E == cast<MDNode>(RHS->getOperand(j)));
663 assert(found && "Losing a member during member list replacement");
668 void DICompositeType::setArraysHelper(MDNode *Elements, MDNode *TParams) {
669 TrackingMDNodeRef N(*this);
672 // Check that the new list of members contains all the old members as well.
673 if (const MDNode *El = cast_or_null<MDNode>(N->getOperand(4)))
674 VerifySubsetOf(El, Elements);
676 N->replaceOperandWith(4, Elements);
679 N->replaceOperandWith(6, TParams);
683 DIScopeRef DIScope::getRef() const {
684 if (!isCompositeType())
685 return DIScopeRef(*this);
686 DICompositeType DTy(DbgNode);
687 if (!DTy.getIdentifier())
688 return DIScopeRef(*this);
689 return DIScopeRef(DTy.getIdentifier());
692 void DICompositeType::setContainingType(DICompositeType ContainingType) {
693 TrackingMDNodeRef N(*this);
694 N->replaceOperandWith(5, ContainingType.getRef());
698 bool DIVariable::isInlinedFnArgument(const Function *CurFn) {
699 assert(CurFn && "Invalid function");
700 if (!getContext().isSubprogram())
702 // This variable is not inlined function argument if its scope
703 // does not describe current function.
704 return !DISubprogram(getContext()).describes(CurFn);
707 bool DISubprogram::describes(const Function *F) {
708 assert(F && "Invalid function");
709 if (F == getFunction())
711 StringRef Name = getLinkageName();
714 if (F->getName() == Name)
719 MDNode *DISubprogram::getVariablesNodes() const {
720 return getNodeField(DbgNode, 8);
723 DIArray DISubprogram::getVariables() const {
724 return DIArray(getNodeField(DbgNode, 8));
727 Metadata *DITemplateValueParameter::getValue() const {
728 return DbgNode->getOperand(3);
731 DIScopeRef DIScope::getContext() const {
734 return DIType(DbgNode).getContext();
737 return DIScopeRef(DISubprogram(DbgNode).getContext());
739 if (isLexicalBlock())
740 return DIScopeRef(DILexicalBlock(DbgNode).getContext());
742 if (isLexicalBlockFile())
743 return DIScopeRef(DILexicalBlockFile(DbgNode).getContext());
746 return DIScopeRef(DINameSpace(DbgNode).getContext());
748 assert((isFile() || isCompileUnit()) && "Unhandled type of scope.");
749 return DIScopeRef(nullptr);
752 StringRef DIScope::getName() const {
754 return DIType(DbgNode).getName();
756 return DISubprogram(DbgNode).getName();
758 return DINameSpace(DbgNode).getName();
759 assert((isLexicalBlock() || isLexicalBlockFile() || isFile() ||
761 "Unhandled type of scope.");
765 StringRef DIScope::getFilename() const {
768 return ::getStringField(getNodeField(DbgNode, 1), 0);
771 StringRef DIScope::getDirectory() const {
774 return ::getStringField(getNodeField(DbgNode, 1), 1);
777 DIArray DICompileUnit::getEnumTypes() const {
778 if (!DbgNode || DbgNode->getNumOperands() < 7)
781 return DIArray(getNodeField(DbgNode, 2));
784 DIArray DICompileUnit::getRetainedTypes() const {
785 if (!DbgNode || DbgNode->getNumOperands() < 7)
788 return DIArray(getNodeField(DbgNode, 3));
791 DIArray DICompileUnit::getSubprograms() const {
792 if (!DbgNode || DbgNode->getNumOperands() < 7)
795 return DIArray(getNodeField(DbgNode, 4));
798 DIArray DICompileUnit::getGlobalVariables() const {
799 if (!DbgNode || DbgNode->getNumOperands() < 7)
802 return DIArray(getNodeField(DbgNode, 5));
805 DIArray DICompileUnit::getImportedEntities() const {
806 if (!DbgNode || DbgNode->getNumOperands() < 7)
809 return DIArray(getNodeField(DbgNode, 6));
812 void DICompileUnit::replaceSubprograms(DIArray Subprograms) {
813 assert(Verify() && "Expected compile unit");
814 if (Subprograms == getSubprograms())
817 const_cast<MDNode *>(DbgNode)->replaceOperandWith(4, Subprograms);
820 void DICompileUnit::replaceGlobalVariables(DIArray GlobalVariables) {
821 assert(Verify() && "Expected compile unit");
822 if (GlobalVariables == getGlobalVariables())
825 const_cast<MDNode *>(DbgNode)->replaceOperandWith(5, GlobalVariables);
828 DILocation DILocation::copyWithNewScope(LLVMContext &Ctx,
829 DILexicalBlockFile NewScope) {
831 assert(NewScope && "Expected valid scope");
833 const auto *Old = cast<MDLocation>(DbgNode);
834 return DILocation(MDLocation::get(Ctx, Old->getLine(), Old->getColumn(),
835 NewScope, Old->getInlinedAt()));
838 unsigned DILocation::computeNewDiscriminator(LLVMContext &Ctx) {
839 std::pair<const char *, unsigned> Key(getFilename().data(), getLineNumber());
840 return ++Ctx.pImpl->DiscriminatorTable[Key];
843 DIVariable llvm::createInlinedVariable(MDNode *DV, MDNode *InlinedScope,
844 LLVMContext &VMContext) {
845 assert(DIVariable(DV).Verify() && "Expected a DIVariable");
847 return cleanseInlinedVariable(DV, VMContext);
849 // Insert inlined scope.
850 SmallVector<Metadata *, 8> Elts;
851 for (unsigned I = 0, E = DIVariableInlinedAtIndex; I != E; ++I)
852 Elts.push_back(DV->getOperand(I));
853 Elts.push_back(InlinedScope);
855 DIVariable Inlined(MDNode::get(VMContext, Elts));
856 assert(Inlined.Verify() && "Expected to create a DIVariable");
860 DIVariable llvm::cleanseInlinedVariable(MDNode *DV, LLVMContext &VMContext) {
861 assert(DIVariable(DV).Verify() && "Expected a DIVariable");
862 if (!DIVariable(DV).getInlinedAt())
863 return DIVariable(DV);
865 // Remove inlined scope.
866 SmallVector<Metadata *, 8> Elts;
867 for (unsigned I = 0, E = DIVariableInlinedAtIndex; I != E; ++I)
868 Elts.push_back(DV->getOperand(I));
870 DIVariable Cleansed(MDNode::get(VMContext, Elts));
871 assert(Cleansed.Verify() && "Expected to create a DIVariable");
875 DISubprogram llvm::getDISubprogram(const MDNode *Scope) {
876 DIDescriptor D(Scope);
877 if (D.isSubprogram())
878 return DISubprogram(Scope);
880 if (D.isLexicalBlockFile())
881 return getDISubprogram(DILexicalBlockFile(Scope).getContext());
883 if (D.isLexicalBlock())
884 return getDISubprogram(DILexicalBlock(Scope).getContext());
886 return DISubprogram();
889 DISubprogram llvm::getDISubprogram(const Function *F) {
890 // We look for the first instr that has a debug annotation leading back to F.
891 for (auto &BB : *F) {
892 auto Inst = std::find_if(BB.begin(), BB.end(), [](const Instruction &Inst) {
893 return !Inst.getDebugLoc().isUnknown();
895 if (Inst == BB.end())
897 DebugLoc DLoc = Inst->getDebugLoc();
898 const MDNode *Scope = DLoc.getScopeNode();
899 DISubprogram Subprogram = getDISubprogram(Scope);
900 return Subprogram.describes(F) ? Subprogram : DISubprogram();
903 return DISubprogram();
906 DICompositeType llvm::getDICompositeType(DIType T) {
907 if (T.isCompositeType())
908 return DICompositeType(T);
910 if (T.isDerivedType()) {
911 // This function is currently used by dragonegg and dragonegg does
912 // not generate identifier for types, so using an empty map to resolve
913 // DerivedFrom should be fine.
914 DITypeIdentifierMap EmptyMap;
915 return getDICompositeType(
916 DIDerivedType(T).getTypeDerivedFrom().resolve(EmptyMap));
919 return DICompositeType();
923 llvm::generateDITypeIdentifierMap(const NamedMDNode *CU_Nodes) {
924 DITypeIdentifierMap Map;
925 for (unsigned CUi = 0, CUe = CU_Nodes->getNumOperands(); CUi != CUe; ++CUi) {
926 DICompileUnit CU(CU_Nodes->getOperand(CUi));
927 DIArray Retain = CU.getRetainedTypes();
928 for (unsigned Ti = 0, Te = Retain.getNumElements(); Ti != Te; ++Ti) {
929 if (!Retain.getElement(Ti).isCompositeType())
931 DICompositeType Ty(Retain.getElement(Ti));
932 if (MDString *TypeId = Ty.getIdentifier()) {
933 // Definition has priority over declaration.
934 // Try to insert (TypeId, Ty) to Map.
935 std::pair<DITypeIdentifierMap::iterator, bool> P =
936 Map.insert(std::make_pair(TypeId, Ty));
937 // If TypeId already exists in Map and this is a definition, replace
938 // whatever we had (declaration or definition) with the definition.
939 if (!P.second && !Ty.isForwardDecl())
940 P.first->second = Ty;
947 //===----------------------------------------------------------------------===//
948 // DebugInfoFinder implementations.
949 //===----------------------------------------------------------------------===//
951 void DebugInfoFinder::reset() {
958 TypeIdentifierMap.clear();
959 TypeMapInitialized = false;
962 void DebugInfoFinder::InitializeTypeMap(const Module &M) {
963 if (!TypeMapInitialized)
964 if (NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu")) {
965 TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
966 TypeMapInitialized = true;
970 void DebugInfoFinder::processModule(const Module &M) {
971 InitializeTypeMap(M);
972 if (NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu")) {
973 for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
974 DICompileUnit CU(CU_Nodes->getOperand(i));
976 DIArray GVs = CU.getGlobalVariables();
977 for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i) {
978 DIGlobalVariable DIG(GVs.getElement(i));
979 if (addGlobalVariable(DIG)) {
980 processScope(DIG.getContext());
981 processType(DIG.getType().resolve(TypeIdentifierMap));
984 DIArray SPs = CU.getSubprograms();
985 for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i)
986 processSubprogram(DISubprogram(SPs.getElement(i)));
987 DIArray EnumTypes = CU.getEnumTypes();
988 for (unsigned i = 0, e = EnumTypes.getNumElements(); i != e; ++i)
989 processType(DIType(EnumTypes.getElement(i)));
990 DIArray RetainedTypes = CU.getRetainedTypes();
991 for (unsigned i = 0, e = RetainedTypes.getNumElements(); i != e; ++i)
992 processType(DIType(RetainedTypes.getElement(i)));
993 DIArray Imports = CU.getImportedEntities();
994 for (unsigned i = 0, e = Imports.getNumElements(); i != e; ++i) {
995 DIImportedEntity Import = DIImportedEntity(Imports.getElement(i));
996 DIDescriptor Entity = Import.getEntity().resolve(TypeIdentifierMap);
998 processType(DIType(Entity));
999 else if (Entity.isSubprogram())
1000 processSubprogram(DISubprogram(Entity));
1001 else if (Entity.isNameSpace())
1002 processScope(DINameSpace(Entity).getContext());
1008 void DebugInfoFinder::processLocation(const Module &M, DILocation Loc) {
1011 InitializeTypeMap(M);
1012 processScope(Loc.getScope());
1013 processLocation(M, Loc.getOrigLocation());
1016 void DebugInfoFinder::processType(DIType DT) {
1019 processScope(DT.getContext().resolve(TypeIdentifierMap));
1020 if (DT.isCompositeType()) {
1021 DICompositeType DCT(DT);
1022 processType(DCT.getTypeDerivedFrom().resolve(TypeIdentifierMap));
1023 if (DT.isSubroutineType()) {
1024 DITypeArray DTA = DISubroutineType(DT).getTypeArray();
1025 for (unsigned i = 0, e = DTA.getNumElements(); i != e; ++i)
1026 processType(DTA.getElement(i).resolve(TypeIdentifierMap));
1029 DIArray DA = DCT.getElements();
1030 for (unsigned i = 0, e = DA.getNumElements(); i != e; ++i) {
1031 DIDescriptor D = DA.getElement(i);
1033 processType(DIType(D));
1034 else if (D.isSubprogram())
1035 processSubprogram(DISubprogram(D));
1037 } else if (DT.isDerivedType()) {
1038 DIDerivedType DDT(DT);
1039 processType(DDT.getTypeDerivedFrom().resolve(TypeIdentifierMap));
1043 void DebugInfoFinder::processScope(DIScope Scope) {
1044 if (Scope.isType()) {
1049 if (Scope.isCompileUnit()) {
1050 addCompileUnit(DICompileUnit(Scope));
1053 if (Scope.isSubprogram()) {
1054 processSubprogram(DISubprogram(Scope));
1057 if (!addScope(Scope))
1059 if (Scope.isLexicalBlock()) {
1060 DILexicalBlock LB(Scope);
1061 processScope(LB.getContext());
1062 } else if (Scope.isLexicalBlockFile()) {
1063 DILexicalBlockFile LBF = DILexicalBlockFile(Scope);
1064 processScope(LBF.getScope());
1065 } else if (Scope.isNameSpace()) {
1066 DINameSpace NS(Scope);
1067 processScope(NS.getContext());
1071 void DebugInfoFinder::processSubprogram(DISubprogram SP) {
1072 if (!addSubprogram(SP))
1074 processScope(SP.getContext().resolve(TypeIdentifierMap));
1075 processType(SP.getType());
1076 DIArray TParams = SP.getTemplateParams();
1077 for (unsigned I = 0, E = TParams.getNumElements(); I != E; ++I) {
1078 DIDescriptor Element = TParams.getElement(I);
1079 if (Element.isTemplateTypeParameter()) {
1080 DITemplateTypeParameter TType(Element);
1081 processScope(TType.getContext().resolve(TypeIdentifierMap));
1082 processType(TType.getType().resolve(TypeIdentifierMap));
1083 } else if (Element.isTemplateValueParameter()) {
1084 DITemplateValueParameter TVal(Element);
1085 processScope(TVal.getContext().resolve(TypeIdentifierMap));
1086 processType(TVal.getType().resolve(TypeIdentifierMap));
1091 void DebugInfoFinder::processDeclare(const Module &M,
1092 const DbgDeclareInst *DDI) {
1093 MDNode *N = dyn_cast<MDNode>(DDI->getVariable());
1096 InitializeTypeMap(M);
1099 if (!DV.isVariable())
1102 if (!NodesSeen.insert(DV).second)
1104 processScope(DIVariable(N).getContext());
1105 processType(DIVariable(N).getType().resolve(TypeIdentifierMap));
1108 void DebugInfoFinder::processValue(const Module &M, const DbgValueInst *DVI) {
1109 MDNode *N = dyn_cast<MDNode>(DVI->getVariable());
1112 InitializeTypeMap(M);
1115 if (!DV.isVariable())
1118 if (!NodesSeen.insert(DV).second)
1120 processScope(DIVariable(N).getContext());
1121 processType(DIVariable(N).getType().resolve(TypeIdentifierMap));
1124 bool DebugInfoFinder::addType(DIType DT) {
1128 if (!NodesSeen.insert(DT).second)
1135 bool DebugInfoFinder::addCompileUnit(DICompileUnit CU) {
1138 if (!NodesSeen.insert(CU).second)
1145 bool DebugInfoFinder::addGlobalVariable(DIGlobalVariable DIG) {
1149 if (!NodesSeen.insert(DIG).second)
1156 bool DebugInfoFinder::addSubprogram(DISubprogram SP) {
1160 if (!NodesSeen.insert(SP).second)
1167 bool DebugInfoFinder::addScope(DIScope Scope) {
1170 // FIXME: Ocaml binding generates a scope with no content, we treat it
1172 if (Scope->getNumOperands() == 0)
1174 if (!NodesSeen.insert(Scope).second)
1176 Scopes.push_back(Scope);
1180 //===----------------------------------------------------------------------===//
1181 // DIDescriptor: dump routines for all descriptors.
1182 //===----------------------------------------------------------------------===//
1184 void DIDescriptor::dump() const {
1189 void DIDescriptor::print(raw_ostream &OS) const {
1193 if (const char *Tag = dwarf::TagString(getTag()))
1194 OS << "[ " << Tag << " ]";
1196 if (this->isSubrange()) {
1197 DISubrange(DbgNode).printInternal(OS);
1198 } else if (this->isCompileUnit()) {
1199 DICompileUnit(DbgNode).printInternal(OS);
1200 } else if (this->isFile()) {
1201 DIFile(DbgNode).printInternal(OS);
1202 } else if (this->isEnumerator()) {
1203 DIEnumerator(DbgNode).printInternal(OS);
1204 } else if (this->isBasicType()) {
1205 DIType(DbgNode).printInternal(OS);
1206 } else if (this->isDerivedType()) {
1207 DIDerivedType(DbgNode).printInternal(OS);
1208 } else if (this->isCompositeType()) {
1209 DICompositeType(DbgNode).printInternal(OS);
1210 } else if (this->isSubprogram()) {
1211 DISubprogram(DbgNode).printInternal(OS);
1212 } else if (this->isGlobalVariable()) {
1213 DIGlobalVariable(DbgNode).printInternal(OS);
1214 } else if (this->isVariable()) {
1215 DIVariable(DbgNode).printInternal(OS);
1216 } else if (this->isObjCProperty()) {
1217 DIObjCProperty(DbgNode).printInternal(OS);
1218 } else if (this->isNameSpace()) {
1219 DINameSpace(DbgNode).printInternal(OS);
1220 } else if (this->isScope()) {
1221 DIScope(DbgNode).printInternal(OS);
1222 } else if (this->isExpression()) {
1223 DIExpression(DbgNode).printInternal(OS);
1227 void DISubrange::printInternal(raw_ostream &OS) const {
1228 int64_t Count = getCount();
1230 OS << " [" << getLo() << ", " << Count - 1 << ']';
1232 OS << " [unbounded]";
1235 void DIScope::printInternal(raw_ostream &OS) const {
1236 OS << " [" << getDirectory() << "/" << getFilename() << ']';
1239 void DICompileUnit::printInternal(raw_ostream &OS) const {
1240 DIScope::printInternal(OS);
1242 unsigned Lang = getLanguage();
1243 if (const char *LangStr = dwarf::LanguageString(Lang))
1246 (OS << "lang 0x").write_hex(Lang);
1250 void DIEnumerator::printInternal(raw_ostream &OS) const {
1251 OS << " [" << getName() << " :: " << getEnumValue() << ']';
1254 void DIType::printInternal(raw_ostream &OS) const {
1258 StringRef Res = getName();
1260 OS << " [" << Res << "]";
1262 // TODO: Print context?
1264 OS << " [line " << getLineNumber() << ", size " << getSizeInBits()
1265 << ", align " << getAlignInBits() << ", offset " << getOffsetInBits();
1267 if (const char *Enc =
1268 dwarf::AttributeEncodingString(DIBasicType(DbgNode).getEncoding()))
1269 OS << ", enc " << Enc;
1274 else if (isProtected())
1275 OS << " [protected]";
1276 else if (isPublic())
1280 OS << " [artificial]";
1282 if (isForwardDecl())
1284 else if (getTag() == dwarf::DW_TAG_structure_type ||
1285 getTag() == dwarf::DW_TAG_union_type ||
1286 getTag() == dwarf::DW_TAG_enumeration_type ||
1287 getTag() == dwarf::DW_TAG_class_type)
1291 if (isStaticMember())
1294 if (isLValueReference())
1295 OS << " [reference]";
1297 if (isRValueReference())
1298 OS << " [rvalue reference]";
1301 void DIDerivedType::printInternal(raw_ostream &OS) const {
1302 DIType::printInternal(OS);
1303 OS << " [from " << getTypeDerivedFrom().getName() << ']';
1306 void DICompositeType::printInternal(raw_ostream &OS) const {
1307 DIType::printInternal(OS);
1308 DIArray A = getElements();
1309 OS << " [" << A.getNumElements() << " elements]";
1312 void DINameSpace::printInternal(raw_ostream &OS) const {
1313 StringRef Name = getName();
1315 OS << " [" << Name << ']';
1317 OS << " [line " << getLineNumber() << ']';
1320 void DISubprogram::printInternal(raw_ostream &OS) const {
1321 // TODO : Print context
1322 OS << " [line " << getLineNumber() << ']';
1324 if (isLocalToUnit())
1330 if (getScopeLineNumber() != getLineNumber())
1331 OS << " [scope " << getScopeLineNumber() << "]";
1335 else if (isProtected())
1336 OS << " [protected]";
1337 else if (isPublic())
1340 if (isLValueReference())
1341 OS << " [reference]";
1343 if (isRValueReference())
1344 OS << " [rvalue reference]";
1346 StringRef Res = getName();
1348 OS << " [" << Res << ']';
1351 void DIGlobalVariable::printInternal(raw_ostream &OS) const {
1352 StringRef Res = getName();
1354 OS << " [" << Res << ']';
1356 OS << " [line " << getLineNumber() << ']';
1358 // TODO : Print context
1360 if (isLocalToUnit())
1367 void DIVariable::printInternal(raw_ostream &OS) const {
1368 StringRef Res = getName();
1370 OS << " [" << Res << ']';
1372 OS << " [line " << getLineNumber() << ']';
1375 void DIExpression::printInternal(raw_ostream &OS) const {
1376 for (unsigned I = 0; I < getNumElements(); ++I) {
1377 uint64_t OpCode = getElement(I);
1378 OS << " [" << OperationEncodingString(OpCode);
1381 OS << " " << getElement(++I);
1385 unsigned Offset = getElement(++I);
1386 unsigned Size = getElement(++I);
1387 OS << " offset=" << Offset << ", size=" << Size;
1394 // Else bail out early. This may be a line table entry.
1402 void DIObjCProperty::printInternal(raw_ostream &OS) const {
1403 StringRef Name = getObjCPropertyName();
1405 OS << " [" << Name << ']';
1407 OS << " [line " << getLineNumber() << ", properties " << getUnsignedField(6)
1411 static void printDebugLoc(DebugLoc DL, raw_ostream &CommentOS,
1412 const LLVMContext &Ctx) {
1413 if (!DL.isUnknown()) { // Print source line info.
1414 DIScope Scope(DL.getScope(Ctx));
1415 assert(Scope.isScope() && "Scope of a DebugLoc should be a DIScope.");
1416 // Omit the directory, because it's likely to be long and uninteresting.
1417 CommentOS << Scope.getFilename();
1418 CommentOS << ':' << DL.getLine();
1419 if (DL.getCol() != 0)
1420 CommentOS << ':' << DL.getCol();
1421 DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(DL.getInlinedAt(Ctx));
1422 if (!InlinedAtDL.isUnknown()) {
1423 CommentOS << " @[ ";
1424 printDebugLoc(InlinedAtDL, CommentOS, Ctx);
1430 void DIVariable::printExtendedName(raw_ostream &OS) const {
1431 const LLVMContext &Ctx = DbgNode->getContext();
1432 StringRef Res = getName();
1434 OS << Res << "," << getLineNumber();
1435 if (MDNode *InlinedAt = getInlinedAt()) {
1436 DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(InlinedAt);
1437 if (!InlinedAtDL.isUnknown()) {
1439 printDebugLoc(InlinedAtDL, OS, Ctx);
1445 template <> DIRef<DIScope>::DIRef(const Metadata *V) : Val(V) {
1446 assert(isScopeRef(V) && "DIScopeRef should be a MDString or MDNode");
1448 template <> DIRef<DIType>::DIRef(const Metadata *V) : Val(V) {
1449 assert(isTypeRef(V) && "DITypeRef should be a MDString or MDNode");
1453 DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const {
1454 return DIScopeRef(cast_or_null<Metadata>(getField(DbgNode, Elt)));
1456 template <> DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const {
1457 return DITypeRef(cast_or_null<Metadata>(getField(DbgNode, Elt)));
1460 bool llvm::StripDebugInfo(Module &M) {
1461 bool Changed = false;
1463 // Remove all of the calls to the debugger intrinsics, and remove them from
1465 if (Function *Declare = M.getFunction("llvm.dbg.declare")) {
1466 while (!Declare->use_empty()) {
1467 CallInst *CI = cast<CallInst>(Declare->user_back());
1468 CI->eraseFromParent();
1470 Declare->eraseFromParent();
1474 if (Function *DbgVal = M.getFunction("llvm.dbg.value")) {
1475 while (!DbgVal->use_empty()) {
1476 CallInst *CI = cast<CallInst>(DbgVal->user_back());
1477 CI->eraseFromParent();
1479 DbgVal->eraseFromParent();
1483 for (Module::named_metadata_iterator NMI = M.named_metadata_begin(),
1484 NME = M.named_metadata_end(); NMI != NME;) {
1485 NamedMDNode *NMD = NMI;
1487 if (NMD->getName().startswith("llvm.dbg.")) {
1488 NMD->eraseFromParent();
1493 for (Module::iterator MI = M.begin(), ME = M.end(); MI != ME; ++MI)
1494 for (Function::iterator FI = MI->begin(), FE = MI->end(); FI != FE;
1496 for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); BI != BE;
1498 if (!BI->getDebugLoc().isUnknown()) {
1500 BI->setDebugLoc(DebugLoc());
1507 unsigned llvm::getDebugMetadataVersionFromModule(const Module &M) {
1508 if (auto *Val = mdconst::extract_or_null<ConstantInt>(
1509 M.getModuleFlag("Debug Info Version")))
1510 return Val->getZExtValue();
1514 llvm::DenseMap<const llvm::Function *, llvm::DISubprogram>
1515 llvm::makeSubprogramMap(const Module &M) {
1516 DenseMap<const Function *, DISubprogram> R;
1518 NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu");
1522 for (MDNode *N : CU_Nodes->operands()) {
1523 DICompileUnit CUNode(N);
1524 DIArray SPs = CUNode.getSubprograms();
1525 for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i) {
1526 DISubprogram SP(SPs.getElement(i));
1527 if (Function *F = SP.getFunction())
1528 R.insert(std::make_pair(F, SP));