// prims.cc - Code for core of runtime environment.
-/* Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation
+/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation
This file is part of libgcj.
// around for use if we run out of memory.
static java::lang::OutOfMemoryError *no_memory;
-// Largest representable size_t.
-#define SIZE_T_MAX ((size_t) (~ (size_t) 0))
+// Number of bytes in largest array object we create. This could be
+// increased to the largest size_t value, so long as the appropriate
+// functions are changed to take a size_t argument instead of jint.
+#define MAX_OBJECT_SIZE ((1<<31) - 1)
static const char *no_properties[] = { NULL };
#endif
\f
+/* Unblock a signal. Unless we do this, the signal may only be sent
+ once. */
+static void
+unblock_signal (int signum)
+{
+#ifdef _POSIX_VERSION
+ sigset_t sigs;
+
+ sigemptyset (&sigs);
+ sigaddset (&sigs, signum);
+ sigprocmask (SIG_UNBLOCK, &sigs, NULL);
+#endif
+}
+
#ifdef HANDLE_SEGV
SIGNAL_HANDLER (catch_segv)
{
java::lang::NullPointerException *nullp
= new java::lang::NullPointerException;
+ unblock_signal (SIGSEGV);
MAKE_THROW_FRAME (nullp);
throw nullp;
}
{
java::lang::ArithmeticException *arithexception
= new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
+ unblock_signal (SIGFPE);
#ifdef HANDLE_DIVIDE_OVERFLOW
HANDLE_DIVIDE_OVERFLOW;
#else
\f
jboolean
-_Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
+_Jv_equalUtf8Consts (const Utf8Const* a, const Utf8Const *b)
{
int len;
- _Jv_ushort *aptr, *bptr;
+ const _Jv_ushort *aptr, *bptr;
if (a == b)
return true;
if (a->hash != b->hash)
len = a->length;
if (b->length != len)
return false;
- aptr = (_Jv_ushort *)a->data;
- bptr = (_Jv_ushort *)b->data;
+ aptr = (const _Jv_ushort *)a->data;
+ bptr = (const _Jv_ushort *)b->data;
len = (len + 1) >> 1;
while (--len >= 0)
if (*aptr++ != *bptr++)
# define jvmpi_notify_alloc(klass,size,obj) /* do nothing */
#endif
-// Allocate a new object of class KLASS. SIZE is the size of the object
-// to allocate. You might think this is redundant, but it isn't; some
-// classes, such as String, aren't of fixed size.
+// Allocate a new object of class KLASS.
// First a version that assumes that we have no finalizer, and that
// the class is already initialized.
// If we know that JVMPI is disabled, this can be replaced by a direct call
// to the allocator for the appropriate GC.
jobject
-_Jv_AllocObjectNoInitNoFinalizer (jclass klass, jint size)
+_Jv_AllocObjectNoInitNoFinalizer (jclass klass)
{
+ jint size = klass->size ();
jobject obj = (jobject) _Jv_AllocObj (size, klass);
jvmpi_notify_alloc (klass, size, obj);
return obj;
// And now a version that initializes if necessary.
jobject
-_Jv_AllocObjectNoFinalizer (jclass klass, jint size)
+_Jv_AllocObjectNoFinalizer (jclass klass)
{
_Jv_InitClass (klass);
+ jint size = klass->size ();
jobject obj = (jobject) _Jv_AllocObj (size, klass);
jvmpi_notify_alloc (klass, size, obj);
return obj;
// And now the general version that registers a finalizer if necessary.
jobject
-_Jv_AllocObject (jclass klass, jint size)
+_Jv_AllocObject (jclass klass)
{
- jobject obj = _Jv_AllocObjectNoFinalizer (klass, size);
-
+ jobject obj = _Jv_AllocObjectNoFinalizer (klass);
+
// We assume that the compiler only generates calls to this routine
// if there really is an interesting finalizer.
// Unfortunately, we still have to the dynamic test, since there may
return obj;
}
+// Allocate a String, including variable length storage.
+jstring
+_Jv_AllocString(jsize len)
+{
+ using namespace java::lang;
+
+ jsize sz = sizeof(java::lang::String) + len * sizeof(jchar);
+
+ // We assert that for strings allocated this way, the data field
+ // will always point to the object itself. Thus there is no reason
+ // for the garbage collector to scan any of it.
+ // Furthermore, we're about to overwrite the string data, so
+ // initialization of the object is not an issue.
+
+ // String needs no initialization, and there is no finalizer, so
+ // we can go directly to the collector's allocator interface.
+ jstring obj = (jstring) _Jv_AllocPtrFreeObj(sz, &String::class$);
+
+ obj->data = obj;
+ obj->boffset = sizeof(java::lang::String);
+ obj->count = len;
+ obj->cachedHashCode = 0;
+
+#ifdef ENABLE_JVMPI
+ // Service JVMPI request.
+
+ if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
+ {
+ JVMPI_Event event;
+
+ event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
+ event.env_id = NULL;
+ event.u.obj_alloc.arena_id = 0;
+ event.u.obj_alloc.class_id = (jobjectID) &String::class$;
+ event.u.obj_alloc.is_array = 0;
+ event.u.obj_alloc.size = sz;
+ event.u.obj_alloc.obj_id = (jobjectID) obj;
+
+ _Jv_DisableGC ();
+ (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
+ _Jv_EnableGC ();
+ }
+#endif
+
+ return obj;
+}
+
// A version of the above that assumes the object contains no pointers,
// and requires no finalization. This can't happen if we need pointers
// to locks.
#ifdef JV_HASH_SYNCHRONIZATION
jobject
-_Jv_AllocPtrFreeObject (jclass klass, jint size)
+_Jv_AllocPtrFreeObject (jclass klass)
{
_Jv_InitClass (klass);
+ jint size = klass->size ();
jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
// Ensure that elements pointer is properly aligned.
jobjectArray obj = NULL;
size_t size = (size_t) elements (obj);
+ // Check for overflow.
+ if (__builtin_expect ((size_t) count >
+ (MAX_OBJECT_SIZE - 1 - size) / sizeof (jobject), false))
+ throw no_memory;
+
size += count * sizeof (jobject);
jclass klass = _Jv_GetArrayClass (elementClass,
// Check for overflow.
if (__builtin_expect ((size_t) count >
- (SIZE_T_MAX - size) / elsize, false))
+ (MAX_OBJECT_SIZE - size) / elsize, false))
throw no_memory;
jclass klass = _Jv_GetArrayClass (eltype, 0);
{
using namespace java::lang::reflect;
- _Jv_InitNewClassFields (cl);
-
// We must set the vtable for the class; the Java constructor
// doesn't do this.
(*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
_Jv_InitClass (&java::lang::VMThrowable::class$);
java::lang::VMThrowable::trace_enabled = 0;
+ // We have to initialize this fairly early, to avoid circular class
+ // initialization. In particular we want to start the
+ // initialization of ClassLoader before we start the initialization
+ // of VMClassLoader.
+ _Jv_InitClass (&java::lang::ClassLoader::class$);
+ // Once the bootstrap loader is in place, change it into a kind of
+ // system loader, by having it read the class path.
+ gnu::gcj::runtime::VMClassLoader::initialize();
+
INIT_SEGV;
#ifdef HANDLE_FPE
INIT_FPE;
#endif
no_memory = new java::lang::OutOfMemoryError;
-
+
java::lang::VMThrowable::trace_enabled = 1;
-
+
#ifdef USE_LTDL
LTDL_SET_PRELOADED_SYMBOLS ();
#endif
return dividend % divisor;
}
+
+\f
+
+// Return true if SELF_KLASS can access a field or method in
+// OTHER_KLASS. The field or method's access flags are specified in
+// FLAGS.
+jboolean
+_Jv_CheckAccess (jclass self_klass, jclass other_klass, jint flags)
+{
+ using namespace java::lang::reflect;
+ return ((self_klass == other_klass)
+ || ((flags & Modifier::PUBLIC) != 0)
+ || (((flags & Modifier::PROTECTED) != 0)
+ && other_klass->isAssignableFrom (self_klass))
+ || (((flags & Modifier::PRIVATE) == 0)
+ && _Jv_ClassNameSamePackage (self_klass->name,
+ other_klass->name)));
+}
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