When parsing a function body, add it to the crash stack, giving us something

like:

Stack dump:
0.	t.c:5:10: in compound statement ('{}')
1.	t.c:3:12: in compound statement ('{}')
2.	t.c:3:12: parsing function body 'foo'
3.	clang t.c 
Abort

llvm-svn: 66118

clang/include/clang/Parse/Action.h

@@ -20,6 +20,7 @@
 #include "clang/Basic/TypeTraits.h"
 #include "clang/Parse/AccessSpecifier.h"
 #include "clang/Parse/Ownership.h"
+#include "llvm/Support/PrettyStackTrace.h"
 
 namespace clang {
   // Semantic.
@@ -118,6 +119,11 @@ public:
 
   /// Statistics.
   virtual void PrintStats() const {}
+
+  /// getDeclName - Return a pretty name for the specified decl if possible, or
+  /// an empty string if not.  This is used for pretty crash reporting. 
+  virtual std::string getDeclName(DeclTy *D) { return ""; }
+  
   //===--------------------------------------------------------------------===//
   // Declaration Tracking Callbacks.
   //===--------------------------------------------------------------------===//
@@ -266,8 +272,8 @@ public:
     return;
   }
 
-  /// ActOnFinishFunctionBody - This is called when a function body has completed
-  /// parsing.  Decl is the DeclTy returned by ParseStartOfFunctionDef.
+  /// ActOnFinishFunctionBody - This is called when a function body has
+  /// completed parsing. Decl is the DeclTy returned by ParseStartOfFunctionDef.
   virtual DeclTy *ActOnFinishFunctionBody(DeclTy *Decl, StmtArg Body) {
     return Decl;
   }
@@ -1510,6 +1516,21 @@ public:
                                            AttributeList *AttrList);
 };
 
+  
+class PrettyStackTraceDecl : public llvm::PrettyStackTraceEntry {
+  Action::DeclTy *TheDecl;
+  SourceLocation Loc;
+  Action &Actions;
+  SourceManager &SM;
+  const char *Message;
+public:
+  PrettyStackTraceDecl(Action::DeclTy *Decl, SourceLocation L,
+                       Action &actions, SourceManager &sm, const char *Msg)
+  : TheDecl(Decl), Loc(L), Actions(actions), SM(sm), Message(Msg) {}
+  
+  virtual void print(llvm::raw_ostream &OS) const;
+};  
+  
 }  // end namespace clang
 
 #endif

clang/lib/Parse/MinimalAction.cpp

@@ -16,8 +16,23 @@
 #include "clang/Parse/Scope.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/RecyclingAllocator.h"
+#include "llvm/Support/raw_ostream.h"
 using namespace clang;
 
+void PrettyStackTraceDecl::print(llvm::raw_ostream &OS) const {
+  if (Loc.isValid()) {
+    Loc.print(OS, SM);
+    OS << ": ";
+  }
+  OS << Message;
+  
+  std::string Name = Actions.getDeclName(TheDecl);
+  if (!Name.empty())
+    OS << " '" << Name << '\'';
+  
+  OS << '\n';
+}
+
 /// TypeNameInfo - A link exists here for each scope that an identifier is
 /// defined.
 namespace {

clang/lib/Parse/ParseStmt.cpp

@@ -1288,6 +1288,10 @@ Parser::DeclTy *Parser::ParseFunctionStatementBody(DeclTy *Decl) {
   assert(Tok.is(tok::l_brace));
   SourceLocation LBraceLoc = Tok.getLocation();
          
+  PrettyStackTraceDecl CrashInfo(Decl, LBraceLoc, Actions,
+                                 PP.getSourceManager(),
+                                 "parsing function body");
+  
   // Do not enter a scope for the brace, as the arguments are in the same scope
   // (the function body) as the body itself.  Instead, just read the statement
   // list and put it into a CompoundStmt for safe keeping.

clang/lib/Sema/Sema.h

@@ -290,6 +290,11 @@ public:
   //===--------------------------------------------------------------------===//
   // Symbol table / Decl tracking callbacks: SemaDecl.cpp.
   //
+
+  /// getDeclName - Return a pretty name for the specified decl if possible, or
+  /// an empty string if not.  This is used for pretty crash reporting. 
+  virtual std::string getDeclName(DeclTy *D);
+  
   virtual TypeTy *getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 
                               Scope *S, const CXXScopeSpec *SS);
   virtual DeclTy *ActOnDeclarator(Scope *S, Declarator &D, DeclTy *LastInGroup){

clang/lib/Sema/SemaDecl.cpp

@@ -30,6 +30,15 @@
 #include <functional>
 using namespace clang;
 
+/// getDeclName - Return a pretty name for the specified decl if possible, or
+/// an empty string if not.  This is used for pretty crash reporting. 
+std::string Sema::getDeclName(DeclTy *d) {
+  Decl *D = static_cast<Decl *>(d);
+  if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D))
+    return DN->getQualifiedNameAsString();
+  return "";
+}
+
 /// \brief If the identifier refers to a type name within this scope,
 /// return the declaration of that type.
 ///