156 lines
3.6 KiB
C++
156 lines
3.6 KiB
C++
// Functions for Exception Support for Java.
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/* Copyright (C) 1998, 1999 Cygnus Solutions
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#include "exception"
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#include <stddef.h>
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#include <java/lang/Class.h>
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#include <java/lang/NullPointerException.h>
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#include <cni.h>
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#include <jvm.h>
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// eh-common.h needs gansidecl.h.
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#include "gansidecl.h"
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#include "eh-common.h"
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typedef struct {
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__eh_info eh_info;
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void *value;
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} java_eh_info;
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/* Language-specific EH info pointer, throw routine, and language/version
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info routines. All defined in libgcc2. */
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extern "C" java_eh_info **__get_eh_info ();
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extern "C" void __throw () __attribute__ ((__noreturn__));
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extern "C" short __get_eh_table_version (void *table);
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extern "C" short __get_eh_table_language (void *table);
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extern "C" void * malloc (size_t);
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extern "C" void free (void *);
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extern "C" void *
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_Jv_type_matcher (java_eh_info *info, void* match_info,
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void *exception_table)
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{
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if (__get_eh_table_language (exception_table) != EH_LANG_Java)
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return NULL;
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/* we don't worry about version info yet, there is only one version! */
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if (match_info != NULL)
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{
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// The match_info is either a (java::lang::Class*) or
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// match_info is one more than a (Utf8Const*).
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if (sizeof(void*) != sizeof(size_t))
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abort();
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size_t mi = (size_t) match_info;
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if ((mi & 1) != 0)
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match_info = _Jv_FindClass ((Utf8Const*) (mi - 1), NULL);
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if (! _Jv_IsInstanceOf ((jobject) info->value, (jclass) match_info))
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return NULL;
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}
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return info->value;
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}
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/* Compiler hook to return a pointer to java exception object. The value
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is cleared, so if the exception needs to be rethrown, it should be set
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again */
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extern "C" void *
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_Jv_exception_info (void)
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{
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java_eh_info *info = *(__get_eh_info ());
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void *ptr;
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if (info == NULL)
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abort ();
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ptr = info->value;
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/* clear the value so another throw is an error */
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info->value = NULL;
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return ptr;
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}
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/* Allocate an exception info structure for java. Called the first time
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an exception is thrown. */
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extern "C" void
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_Jv_eh_alloc ()
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{
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/* FIXME: we should use _Jv_AllocBytes here. However, libgcc2
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apparently can sometimes free() this value itself. */
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java_eh_info *p = (java_eh_info *) malloc (sizeof (java_eh_info));
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if (p == 0)
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terminate ();
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p->value = 0;
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java_eh_info ** info_ptr = __get_eh_info ();
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/* There should NOT be an exception info pointer already. */
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if (*info_ptr != NULL)
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abort ();
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*info_ptr = p;
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}
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/* Deallocate the current exception info structure. Called at shutdown time. */
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extern "C" void
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_Jv_eh_free ()
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{
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java_eh_info ** info_ptr = __get_eh_info ();
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if (*info_ptr == NULL)
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abort ();
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/* FIXME: ideally we should just let the GC handle this. */
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free (*info_ptr);
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*info_ptr = NULL;
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}
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/* Perform a throw, Java style. Throw will unwind through this call, so
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there better not be any handlers or exception thrown here. */
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/* Initialize an __eh_info structure with this libraries matching info. */
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extern "C" void
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_Jv_setup_eh_info (__eh_info *)
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{
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}
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extern "C" void
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_Jv_Throw (void *value)
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{
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if (value == NULL)
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value = (void *) new java::lang::NullPointerException ();
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java_eh_info *ehinfo = *(__get_eh_info ());
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if (ehinfo == NULL)
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{
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_Jv_eh_alloc ();
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ehinfo = *(__get_eh_info ());
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}
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ehinfo->eh_info.match_function = _Jv_type_matcher;
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ehinfo->eh_info.language = EH_LANG_Java;
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ehinfo->eh_info.version = 1;
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ehinfo->value = value;
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__throw();
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}
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