Without this patch, the isDerivedFrom matcher asserts in the
"assert(ClassDecl != NULL);" in the new test, as a
DependentTemplateSpecilizationType is not a sub-type of
TemplateSpecializationType and also does not offer getAsCXXRecordDecl().
I am not sure why this did not cause problems before. It is now (after
the changed implementation of isDerivedFrom) easier to write a matcher
that actually gets into this branch of the code.
llvm-svn: 164127
class itself. This caused some confusion (intuitively, a class is not
derived from itself) and makes it hard to write certain matchers, e.g.
"match and bind any pair of base and subclass".
The original behavior can be achieved with a new isA-matcher. Similar
to all other matchers, this matcher has the same behavior and name as
the corresponding AST-entity - in this case the isa<>() function.
llvm-svn: 163385
Implements the hasAncestor matcher. This builds
on the previous patch that introduced DynTypedNode to build up
a parent map for an additional degree of freedom in the AST traversal.
The map is only built once we hit an hasAncestor matcher, in order
to not slow down matching for cases where this is not needed.
We could implement some speed-ups for special cases, like building up
the parent map as we go and only building up the full map if we break
out of the already visited part of the tree, but that is probably
not going to be worth it, and would make the code significantly more
complex.
Major TODOs are:
- implement hasParent
- implement type traversal
- implement memoization in hasAncestor
llvm-svn: 163382
Due to DynTypedNode the basic dynamically typed matcher interface can now be simplified.
Also switches the traversal interfaces to use DynTypedNode;
this is in preperation for the hasAncestor implementation, and
also allows us to need fewer changes when we want to add new
nodes to traverse, thus making the code a little more decoupled.
Main design concerns: I went back towards the original design
of getNodeAs to return a pointer, and switched DynTypedNode::get
to always return a pointer (in case of value types like QualType
the pointer points into the storage of DynTypedNode, thus allowing
us to treat all the nodes the same from the point of view of a
user of the DynTypedNodes.
Adding the QualType implementation for DynTypedNode was needed
for the recursive traversal interface changes.
llvm-svn: 163212
Intorduces an abstraction for DynTypedNode which makes
is impossible to create in ways that introduced the bug;
also hides the implementation details of the template
magic away from the user and prepares the code for adding
QualType and TypeLoc bindings, as well as using DynTypedNode
instead of overloads for child and ancestor matching.
getNodeAs<T> was changed towards a non-pointer type, as
we'll want QualType and TypeLoc nodes to be returned
by value (the alternative would be to create new storage
which is prohibitively costly if we want to use it for
child / ancestor matching).
DynTypedNode is moved into a new header ASTTypeTraits.h,
as it is completely independent of the rest of the matcher
infrastructure - if the need comes up, we can move it to
a more common place.
The interface for users before the introduction of the
common storage change remains the same, minus the introduced
bug, for which a regression test was added.
llvm-svn: 162936
into the correct types when pulling them out in the result
callback in a type safe way.
This is also the base change for multiple things that will
allow handling things more generally and thus supporting more
of the AST, especially handling Type nodes.
Patch contributed by Michael Diamond.
llvm-svn: 162804
Daniel Jasper