2004-10-13 Andrew Haley <aph@redhat.com>

        * interpret.cc (_Jv_InterpMethod::run): Initialize
        _Jv_StartOfInterpreter.
        (_Jv_StartOfInterpreter, _Jv_EndOfInterpreter): Functions removed.
        (_Jv_StartOfInterpreter, _Jv_EndOfInterpreter): New variables.
        * gnu/gcj/runtime/natStackTrace.cc (fillInStackTrace): Use
        _Unwind_FindEnclosingFunction to discover whether PC is within the
        interpreter.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@89037 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 13 insertions, 13 deletions

diff --git a/libjava/interpret.cc b/libjava/interpret.cc
index 109ee10ff8b..0446c729623 100644
--- a/libjava/interpret.cc
+++ b/libjava/interpret.cc
@@ -774,18 +774,25 @@ _Jv_InterpMethod::compile (const void * const *insn_targets)
 }
 #endif /* DIRECT_THREADED */
 
-// This function exists so that the stack-tracing code can find the
-// boundaries of the interpreter.
-void
-_Jv_StartOfInterpreter (void)
-{
-}
+// These exist so that the stack-tracing code can find the boundaries
+// of the interpreter.
+void *_Jv_StartOfInterpreter;
+void *_Jv_EndOfInterpreter;
+extern "C" void *_Unwind_FindEnclosingFunction (void *pc);
 
 void
 _Jv_InterpMethod::run (void *retp, ffi_raw *args)
 {
   using namespace java::lang::reflect;
 
+  // Record the address of the start of this member function in
+  // _Jv_StartOfInterpreter.  Such a write to a global variable
+  // without acquiring a lock is correct iff reads and writes of words
+  // in memory are atomic, but Java requires that anyway.
+ foo:
+  if (_Jv_StartOfInterpreter == NULL)
+    _Jv_StartOfInterpreter = _Unwind_FindEnclosingFunction (&&foo);
+
   // FRAME_DESC registers this particular invocation as the top-most
   // interpreter frame.  This lets the stack tracing code (for
   // Throwable) print information about the method being interpreted
@@ -3219,13 +3226,6 @@ _Jv_InterpMethod::run (void *retp, ffi_raw *args)
     }
 }
 
-// This function exists so that the stack-tracing code can find the
-// boundaries of the interpreter.
-void
-_Jv_EndOfInterpreter (void)
-{
-}
-
 static void
 throw_internal_error (char *msg)
 {