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[libclang] Avoid having the cursor of an expression replace the declaration cursor 

when the expression source range overlaps the declaration range.

This can happen for C++ constructor expressions whose range generally
include the variable declaration, e.g.:

  MyCXXClass foo; // Make sure pointing at 'foo' returns a VarDecl cursor.

rdar://9124499.

llvm-svn: 133930
This commit is contained in:
Argyrios Kyrtzidis 2011-06-27 19:42:23 +00:00
parent 66cd1dacbc
commit d289104e29
2 changed files with 34 additions and 3 deletions
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7
clang/test/Index/get-cursor.cpp
View File

@ -31,6 +31,10 @@ struct YDerived : Y {
X getAnotherX() { return member; }
};
void test() {
X foo;
}
// RUN: c-index-test -cursor-at=%s:12:20 %s | FileCheck -check-prefix=CHECK-VALUE-REF %s
// RUN: c-index-test -cursor-at=%s:13:21 %s | FileCheck -check-prefix=CHECK-VALUE-REF %s
// RUN: c-index-test -cursor-at=%s:13:28 %s | FileCheck -check-prefix=CHECK-VALUE-REF %s
@ -61,3 +65,6 @@ struct YDerived : Y {
// RUN: c-index-test -cursor-at=%s:27:10 %s | FileCheck -check-prefix=CHECK-IMPLICIT-MEMREF %s
// RUN: c-index-test -cursor-at=%s:31:28 %s | FileCheck -check-prefix=CHECK-IMPLICIT-MEMREF %s
// CHECK-IMPLICIT-MEMREF: MemberRefExpr=member:21:7
// RUN: c-index-test -cursor-at=%s:35:5 %s | FileCheck -check-prefix=CHECK-DECL %s
// CHECK-DECL: VarDecl=foo:35:5

30
clang/tools/libclang/CIndex.cpp
View File

@ -3393,11 +3393,34 @@ CXString clang_getCursorKindSpelling(enum CXCursorKind Kind) {
return createCXString((const char*) 0);
}
struct GetCursorData {
SourceLocation TokenBeginLoc;
CXCursor &BestCursor;
GetCursorData(SourceLocation tokenBegin, CXCursor &outputCursor)
: TokenBeginLoc(tokenBegin), BestCursor(outputCursor) { }
};
enum CXChildVisitResult GetCursorVisitor(CXCursor cursor,
CXCursor parent,
CXClientData client_data) {
CXCursor *BestCursor = static_cast<CXCursor *>(client_data);
GetCursorData *Data = static_cast<GetCursorData *>(client_data);
CXCursor *BestCursor = &Data->BestCursor;
if (clang_isExpression(cursor.kind) &&
clang_isDeclaration(BestCursor->kind)) {
Decl *D = getCursorDecl(*BestCursor);
// Avoid having the cursor of an expression replace the declaration cursor
// when the expression source range overlaps the declaration range.
// This can happen for C++ constructor expressions whose range generally
// include the variable declaration, e.g.:
// MyCXXClass foo; // Make sure pointing at 'foo' returns a VarDecl cursor.
if (D->getLocation().isValid() && Data->TokenBeginLoc.isValid() &&
D->getLocation() == Data->TokenBeginLoc)
return CXChildVisit_Break;
}
// If our current best cursor is the construction of a temporary object,
// don't replace that cursor with a type reference, because we want
// clang_getCursor() to point at the constructor.
@ -3441,8 +3464,9 @@ CXCursor clang_getCursor(CXTranslationUnit TU, CXSourceLocation Loc) {
// FIXME: Would be great to have a "hint" cursor, then walk from that
// hint cursor upward until we find a cursor whose source range encloses
// the region of interest, rather than starting from the translation unit.
GetCursorData ResultData(SLoc, Result);
CXCursor Parent = clang_getTranslationUnitCursor(TU);
CursorVisitor CursorVis(TU, GetCursorVisitor, &Result,
CursorVisitor CursorVis(TU, GetCursorVisitor, &ResultData,
Decl::MaxPCHLevel, true, SourceLocation(SLoc));
CursorVis.VisitChildren(Parent);
}