[analyzer] Add debug helper LocationContext::dumpStack().

Sample output:
  #0 void construct(pointer __p, llvm::ImutAVLTree<llvm::ImutContainerInfo<clang::ento::BugType *> > *const &__val)
  #1 void push_back(const value_type &__x)
  #2 void destroy()
  #3 void release()
  #4 void ~ImmutableSet()

llvm-svn: 178400

1 files changed, 26 insertions, 0 deletions

diff --git a/clang/lib/Analysis/AnalysisDeclContext.cpp b/clang/lib/Analysis/AnalysisDeclContext.cpp
index ebbafbf4a9a..5ff7842407a 100644
--- a/clang/lib/Analysis/AnalysisDeclContext.cpp
+++ b/clang/lib/Analysis/AnalysisDeclContext.cpp
@@ -28,6 +28,7 @@
 #include "clang/Analysis/Support/BumpVector.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/SaveAndRestore.h"
 
 using namespace clang;
@@ -386,6 +387,31 @@ bool LocationContext::isParentOf(const LocationContext *LC) const {
   return false;
 }
 
+void LocationContext::dumpStack() const {
+  ASTContext &Ctx = getAnalysisDeclContext()->getASTContext();
+  PrintingPolicy PP(Ctx.getLangOpts());
+  PP.TerseOutput = 1;
+
+  unsigned Frame = 0;
+  for (const LocationContext *LCtx = this; LCtx; LCtx = LCtx->getParent()) {
+    switch (LCtx->getKind()) {
+    case StackFrame:
+      llvm::errs() << '#' << Frame++ << ' ';
+      cast<StackFrameContext>(LCtx)->getDecl()->print(llvm::errs(), PP);
+      llvm::errs() << '\n';
+      break;
+    case Scope:
+      llvm::errs() << "    (scope)\n";
+      break;
+    case Block:
+      llvm::errs() << "    (block context: "
+                   << cast<BlockInvocationContext>(LCtx)->getContextData()
+                   << ")\n";
+      break;
+    }
+  }
+}
+
 //===----------------------------------------------------------------------===//
 // Lazily generated map to query the external variables referenced by a Block.
 //===----------------------------------------------------------------------===//