Add analysis support for blocks. This includes a few key changes:
- Refactor the MemRegion hierarchy to distinguish between different StackSpaceRegions for locals and parameters.
- VarRegions for "captured" variables now have the BlockDataRegion as their super region (except those passed by reference)
- Add transfer function support to GRExprEngine for BlockDeclRefExprs.
This change also supports analyzing blocks as an analysis entry point
(top-of-the-stack), which required pushing more context-sensitivity
around in the MemRegion hierarchy via the use of LocationContext
objects. Functionally almost everything is the same, except we track
LocationContexts in a few more areas and StackSpaceRegions now refer
to a StackFrameContext object. In the future we will need to modify
MemRegionManager to allow multiple StackSpaceRegions in flight at once
(for the analysis of multiple stack frames).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@90809 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/AnalysisContext.cpp b/lib/Analysis/AnalysisContext.cpp
index 6b74b52..113587f 100644
--- a/lib/Analysis/AnalysisContext.cpp
+++ b/lib/Analysis/AnalysisContext.cpp
@@ -166,6 +166,20 @@
}
//===----------------------------------------------------------------------===//
+// LocationContext methods.
+//===----------------------------------------------------------------------===//
+
+const StackFrameContext *LocationContext::getCurrentStackFrame() const {
+ const LocationContext *LC = this;
+ while (LC) {
+ if (const StackFrameContext *SFC = dyn_cast<StackFrameContext>(LC))
+ return SFC;
+ LC = LC->getParent();
+ }
+ return NULL;
+}
+
+//===----------------------------------------------------------------------===//
// Lazily generated map to query the external variables referenced by a Block.
//===----------------------------------------------------------------------===//