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// java-stack.h - Definitions for unwinding & inspecting the call stack.

/* Copyright (C) 2005, 2006  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the

Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for

details.  */

#ifndef __JV_STACKTRACE_H__

#define __JV_STACKTRACE_H__

#include <stdlib.h>

#include <unwind.h>

#include <gcj/cni.h>

#include <gcj/javaprims.h>

#include <java-interp.h>

#include <java/lang/Class.h>

#include <java/lang/StackTraceElement.h>

#include <java/lang/Throwable.h>

#include <java/lang/Thread.h>

#include <java/util/IdentityHashMap.h>

#include <gnu/gcj/runtime/NameFinder.h>

using namespace gnu::gcj::runtime;

using namespace java::lang;

extern "Java"

{

  namespace gnu

  {

    namespace classpath

    {

        class VMStackWalker;

    }

  }

}

#ifdef INTERPRETER

struct _Jv_InterpFrameInfo

{

  _Jv_InterpMethod *meth;

  pc_t pc;

};

#endif

struct _Jv_StackFrame

{

  _Jv_FrameType type;   /* Native or interpreted.  */

  union {

#ifdef INTERPRETER

    _Jv_InterpFrameInfo interp;

#endif

    struct {

      jclass proxyClass;

      _Jv_Method *proxyMethod;

    };

    struct {

      void *ip;

      void *start_ip;

    };

  };

  jclass klass;

  _Jv_Method *meth;

};

struct _Jv_UnwindState;

typedef _Unwind_Reason_Code (*_Jv_TraceFn) (_Jv_UnwindState *);

struct _Jv_UnwindState

{

  jint length;                   // length of FRAMES

  jint pos;                      // current position in FRAMES

  _Jv_StackFrame *frames;        // array of stack frame data to be filled.

#ifdef INTERPRETER

  _Jv_InterpFrame *interp_frame; // current frame in the interpreter stack.

#endif

  _Jv_TraceFn trace_function;    // function to call back after each frame

                                 // is enumerated. May be NULL.

  void *trace_data;              // additional state data for trace_function.

  _Jv_UnwindState (jint ln)

    {

      length = ln;

      pos = 0;

      frames = NULL;

#ifdef INTERPRETER

      Thread *thread = Thread::currentThread();

      // Check for NULL currentThread(), in case an exception is created 

      // very early during the runtime startup.

      if (thread)

        interp_frame = (_Jv_InterpFrame *) thread->interp_frame;

      else

        interp_frame = NULL;

#endif

      trace_function = NULL;

      trace_data = NULL;

    }

};

class _Jv_StackTrace

{

private:

  int length;

  _Jv_StackFrame frames[];

  static java::util::IdentityHashMap *ncodeMap;

  static void UpdateNCodeMap ();

  static jclass ClassForFrame (_Jv_StackFrame *frame);

  static void FillInFrameInfo (_Jv_StackFrame *frame);

  static void getLineNumberForFrame(_Jv_StackFrame *frame, NameFinder *finder,

                                    jstring *sourceFileName, jint *lineNum,

                                    jstring *methodName);

  static _Unwind_Reason_Code UnwindTraceFn (struct _Unwind_Context *context,

    void *state_ptr);

  static _Unwind_Reason_Code calling_class_trace_fn (_Jv_UnwindState *state);

  static _Unwind_Reason_Code non_system_trace_fn (_Jv_UnwindState *state);

  static _Unwind_Reason_Code accesscontrol_trace_fn (_Jv_UnwindState *state);

  static _Unwind_Reason_Code stackwalker_trace_fn (_Jv_UnwindState *state);

  static _Unwind_Reason_Code stackwalker_nnl_trace_fn (_Jv_UnwindState *state);

public:

  static _Jv_StackTrace *GetStackTrace (void);

  static JArray< ::java::lang::StackTraceElement *>*

    GetStackTraceElements (_Jv_StackTrace *trace,

    java::lang::Throwable *throwable);

  static jclass GetCallingClass (jclass);

  static void GetCallerInfo (jclass checkClass, jclass *, _Jv_Method **);

  static ClassLoader *GetFirstNonSystemClassLoader (void);

  static jobjectArray GetAccessControlStack ();

  static JArray<jclass> *GetStackWalkerStack ();

  static jclass GetStackWalkerCallingClass ();

  static ClassLoader *GetStackWalkerFirstNonNullLoader ();

  friend jclass _Jv_GetMethodDeclaringClass (jmethodID);

  friend class gnu::classpath::VMStackWalker;

};

// Information about a given address.

struct _Jv_AddrInfo

{

  // File name of the defining module.

  const char *file_name;

  // Base address of the loaded module.

  void *base;

  // Name of the nearest symbol.

  const char *sym_name;

  // Address of the nearest symbol.

  void *sym_addr;

  ~_Jv_AddrInfo (void)

    {

      // On systems with a real dladdr(), the file and symbol names given by

      // _Jv_platform_dladdr() are not dynamically allocated.  On Windows,

      // they are.

#ifdef WIN32

      if (file_name)

        free ((void *)file_name);

      if (sym_name)

        free ((void *)sym_name);

#endif /* WIN32 */

    }

};

#endif /* __JV_STACKTRACE_H__ */