[cfe-commits] r125434 - in /cfe/trunk: include/clang/Serialization/ASTReader.h lib/Serialization/ASTReader.cpp lib/Serialization/ASTReaderDecl.cpp lib/Serialization/ASTWriterDecl.cpp test/Index/c-index-redecls.c
Argyrios Kyrtzidis
akyrtzi at gmail.com
Fri Feb 11 23:50:47 PST 2011
Author: akirtzidis
Date: Sat Feb 12 01:50:47 2011
New Revision: 125434
URL: http://llvm.org/viewvc/llvm-project?rev=125434&view=rev
Log:
When reading the AST, delay loading of the redeclaration chain to avoid deeply nested calls.
Temporarily set the first (canonical) declaration as the previous one, which is the one that
matters, and mark the real previous DeclID to be loaded & attached later on.
Fixes rdar://8956193.
Added:
cfe/trunk/test/Index/c-index-redecls.c
Modified:
cfe/trunk/include/clang/Serialization/ASTReader.h
cfe/trunk/lib/Serialization/ASTReader.cpp
cfe/trunk/lib/Serialization/ASTReaderDecl.cpp
cfe/trunk/lib/Serialization/ASTWriterDecl.cpp
Modified: cfe/trunk/include/clang/Serialization/ASTReader.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Serialization/ASTReader.h?rev=125434&r1=125433&r2=125434&view=diff
==============================================================================
--- cfe/trunk/include/clang/Serialization/ASTReader.h (original)
+++ cfe/trunk/include/clang/Serialization/ASTReader.h Sat Feb 12 01:50:47 2011
@@ -721,6 +721,13 @@
/// Objective-C protocols.
std::deque<Decl *> InterestingDecls;
+ /// \brief We delay loading of the previous declaration chain to avoid
+ /// deeply nested calls when there are many redeclarations.
+ std::deque<std::pair<Decl *, serialization::DeclID> > PendingPreviousDecls;
+
+ /// \brief Ready to load the previous declaration of the given Decl.
+ void loadAndAttachPreviousDecl(Decl *D, serialization::DeclID ID);
+
/// \brief When reading a Stmt tree, Stmt operands are placed in this stack.
llvm::SmallVector<Stmt *, 16> StmtStack;
Modified: cfe/trunk/lib/Serialization/ASTReader.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Serialization/ASTReader.cpp?rev=125434&r1=125433&r2=125434&view=diff
==============================================================================
--- cfe/trunk/lib/Serialization/ASTReader.cpp (original)
+++ cfe/trunk/lib/Serialization/ASTReader.cpp Sat Feb 12 01:50:47 2011
@@ -4815,6 +4815,13 @@
PendingIdentifierInfos.pop_front();
}
+ // Ready to load previous declarations of Decls that were delayed.
+ while (!PendingPreviousDecls.empty()) {
+ loadAndAttachPreviousDecl(PendingPreviousDecls.front().first,
+ PendingPreviousDecls.front().second);
+ PendingPreviousDecls.pop_front();
+ }
+
// We are not in recursive loading, so it's safe to pass the "interesting"
// decls to the consumer.
if (Consumer)
Modified: cfe/trunk/lib/Serialization/ASTReaderDecl.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Serialization/ASTReaderDecl.cpp?rev=125434&r1=125433&r2=125434&view=diff
==============================================================================
--- cfe/trunk/lib/Serialization/ASTReaderDecl.cpp (original)
+++ cfe/trunk/lib/Serialization/ASTReaderDecl.cpp Sat Feb 12 01:50:47 2011
@@ -75,6 +75,8 @@
: Reader(Reader), F(F), Cursor(Cursor), ThisDeclID(thisDeclID),
Record(Record), Idx(Idx), TypeIDForTypeDecl(0) { }
+ static void attachPreviousDecl(Decl *D, Decl *previous);
+
void Visit(Decl *D);
void UpdateDecl(Decl *D, const RecordData &Record);
@@ -981,13 +983,22 @@
// can be used while this is still initializing.
assert(D->CommonOrPrev.isNull() && "getCommonPtr was called earlier on this");
- RedeclarableTemplateDecl *PrevDecl =
- cast_or_null<RedeclarableTemplateDecl>(Reader.GetDecl(Record[Idx++]));
- assert((PrevDecl == 0 || PrevDecl->getKind() == D->getKind()) &&
- "PrevDecl kind mismatch");
- if (PrevDecl)
- D->CommonOrPrev = PrevDecl;
- if (PrevDecl == 0) {
+ DeclID PreviousDeclID = Record[Idx++];
+ DeclID FirstDeclID = PreviousDeclID ? Record[Idx++] : 0;
+ // We delay loading of the redeclaration chain to avoid deeply nested calls.
+ // We temporarily set the first (canonical) declaration as the previous one
+ // which is the one that matters and mark the real previous DeclID to be
+ // loaded & attached later on.
+ RedeclarableTemplateDecl *FirstDecl =
+ cast_or_null<RedeclarableTemplateDecl>(Reader.GetDecl(FirstDeclID));
+ assert((FirstDecl == 0 || FirstDecl->getKind() == D->getKind()) &&
+ "FirstDecl kind mismatch");
+ if (FirstDecl) {
+ D->CommonOrPrev = FirstDecl;
+ // Mark the real previous DeclID to be loaded & attached later on.
+ if (PreviousDeclID != FirstDeclID)
+ Reader.PendingPreviousDecls.push_back(std::make_pair(D, PreviousDeclID));
+ } else {
D->CommonOrPrev = D->newCommon(*Reader.getContext());
if (RedeclarableTemplateDecl *RTD
= cast_or_null<RedeclarableTemplateDecl>(Reader.GetDecl(Record[Idx++]))) {
@@ -1224,10 +1235,20 @@
" reading");
case NoRedeclaration:
break;
- case PointsToPrevious:
+ case PointsToPrevious: {
+ DeclID PreviousDeclID = Record[Idx++];
+ DeclID FirstDeclID = Record[Idx++];
+ // We delay loading of the redeclaration chain to avoid deeply nested calls.
+ // We temporarily set the first (canonical) declaration as the previous one
+ // which is the one that matters and mark the real previous DeclID to be
+ // loaded & attached later on.
D->RedeclLink = typename Redeclarable<T>::PreviousDeclLink(
- cast_or_null<T>(Reader.GetDecl(Record[Idx++])));
+ cast_or_null<T>(Reader.GetDecl(FirstDeclID)));
+ if (PreviousDeclID != FirstDeclID)
+ Reader.PendingPreviousDecls.push_back(std::make_pair(static_cast<T*>(D),
+ PreviousDeclID));
break;
+ }
case PointsToLatest:
D->RedeclLink = typename Redeclarable<T>::LatestDeclLink(
cast_or_null<T>(Reader.GetDecl(Record[Idx++])));
@@ -1327,6 +1348,25 @@
return RecordLocation(F, F->DeclOffsets[Index]);
}
+void ASTDeclReader::attachPreviousDecl(Decl *D, Decl *previous) {
+ assert(D && previous);
+ if (TagDecl *TD = dyn_cast<TagDecl>(D)) {
+ TD->RedeclLink.setPointer(cast<TagDecl>(previous));
+ } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
+ FD->RedeclLink.setPointer(cast<FunctionDecl>(previous));
+ } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
+ VD->RedeclLink.setPointer(cast<VarDecl>(previous));
+ } else {
+ RedeclarableTemplateDecl *TD = cast<RedeclarableTemplateDecl>(D);
+ TD->CommonOrPrev = cast<RedeclarableTemplateDecl>(previous);
+ }
+}
+
+void ASTReader::loadAndAttachPreviousDecl(Decl *D, serialization::DeclID ID) {
+ Decl *previous = GetDecl(ID);
+ ASTDeclReader::attachPreviousDecl(D, previous);
+}
+
/// \brief Read the declaration at the given offset from the AST file.
Decl *ASTReader::ReadDeclRecord(unsigned Index, DeclID ID) {
RecordLocation Loc = DeclCursorForIndex(Index, ID);
Modified: cfe/trunk/lib/Serialization/ASTWriterDecl.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Serialization/ASTWriterDecl.cpp?rev=125434&r1=125433&r2=125434&view=diff
==============================================================================
--- cfe/trunk/lib/Serialization/ASTWriterDecl.cpp (original)
+++ cfe/trunk/lib/Serialization/ASTWriterDecl.cpp Sat Feb 12 01:50:47 2011
@@ -862,6 +862,9 @@
// getCommonPtr() can be used while this is still initializing.
Writer.AddDeclRef(D->getPreviousDeclaration(), Record);
+ if (D->getPreviousDeclaration())
+ Writer.AddDeclRef(D->getFirstDeclaration(), Record);
+
if (D->getPreviousDeclaration() == 0) {
// This TemplateDecl owns the CommonPtr; write it.
assert(D->isCanonicalDecl());
@@ -1075,9 +1078,14 @@
if (D->RedeclLink.getNext() == D) {
Record.push_back(NoRedeclaration);
} else {
- Record.push_back(D->RedeclLink.NextIsPrevious() ? PointsToPrevious
- : PointsToLatest);
- Writer.AddDeclRef(D->RedeclLink.getPointer(), Record);
+ if (D->RedeclLink.NextIsPrevious()) {
+ Record.push_back(PointsToPrevious);
+ Writer.AddDeclRef(D->getPreviousDeclaration(), Record);
+ Writer.AddDeclRef(D->getFirstDeclaration(), Record);
+ } else {
+ Record.push_back(PointsToLatest);
+ Writer.AddDeclRef(D->RedeclLink.getPointer(), Record);
+ }
}
T *First = D->getFirstDeclaration();
Added: cfe/trunk/test/Index/c-index-redecls.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Index/c-index-redecls.c?rev=125434&view=auto
==============================================================================
--- cfe/trunk/test/Index/c-index-redecls.c (added)
+++ cfe/trunk/test/Index/c-index-redecls.c Sat Feb 12 01:50:47 2011
@@ -0,0 +1,107 @@
+// RUN: %clang_cc1 -emit-pch -o %t.ast %s
+// RUN: c-index-test -test-load-tu %t.ast all
+
+// rdar://8956193 - We would blow the thread stack because of nested calls due
+// to redeclarations.
+
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
+void socrates(void);
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