603 lines
14 KiB
C++
603 lines
14 KiB
C++
// prims.cc - Code for core of runtime environment.
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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 <stdlib.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#ifdef HANDLE_SEGV
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#include <signal.h>
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#endif
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#pragma implementation "java-array.h"
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#include <cni.h>
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#include <jvm.h>
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#include <java/lang/Class.h>
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#include <java/lang/Runtime.h>
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#include <java/lang/String.h>
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#include <java/lang/Thread.h>
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#include <java/lang/ThreadGroup.h>
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#include <java/lang/FirstThread.h>
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#include <java/lang/ArrayIndexOutOfBoundsException.h>
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#include <java/lang/ClassFormatError.h>
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#include <java/lang/ClassCastException.h>
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#include <java/lang/NegativeArraySizeException.h>
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#include <java/lang/NullPointerException.h>
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#include <java/lang/OutOfMemoryError.h>
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#include <java/lang/ArrayStoreException.h>
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#include <java/lang/System.h>
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#include <java/lang/reflect/Modifier.h>
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#include <java/io/PrintStream.h>
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#define ObjectClass _CL_Q34java4lang6Object
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extern java::lang::Class ObjectClass;
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// We allocate a single OutOfMemoryError exception which we keep
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// around for use if we run out of memory.
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static java::lang::OutOfMemoryError *no_memory;
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// Largest representable size_t.
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#define SIZE_T_MAX ((size_t) (~ (size_t) 0))
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jboolean
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_Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
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{
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register int len;
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register _Jv_ushort *aptr, *bptr;
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if (a == b)
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return true;
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if (a->hash != b->hash)
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return false;
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len = a->length;
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if (b->length != len)
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return false;
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aptr = (_Jv_ushort *)a->data;
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bptr = (_Jv_ushort *)b->data;
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len = (len + 1) >> 1;
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while (--len >= 0)
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if (*aptr++ != *bptr++)
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return false;
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return true;
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}
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/* True iff A is equal to STR.
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HASH is STR->hashCode().
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*/
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jboolean
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_Jv_equal (Utf8Const* a, jstring str, jint hash)
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{
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if (a->hash != (_Jv_ushort) hash)
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return false;
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jint len = str->length();
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jint i = 0;
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jchar *sptr = _Jv_GetStringChars (str);
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register unsigned char* ptr = (unsigned char*) a->data;
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register unsigned char* limit = ptr + a->length;
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for (;; i++, sptr++)
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{
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int ch = UTF8_GET (ptr, limit);
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if (i == len)
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return ch < 0;
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if (ch != *sptr)
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return false;
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}
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return true;
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}
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/* Count the number of Unicode chars encoded in a given Ut8 string. */
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int
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_Jv_strLengthUtf8(char* str, int len)
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{
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register unsigned char* ptr;
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register unsigned char* limit;
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int str_length;
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ptr = (unsigned char*) str;
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limit = ptr + len;
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str_length = 0;
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for (; ptr < limit; str_length++) {
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if (UTF8_GET (ptr, limit) < 0) {
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return (-1);
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}
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}
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return (str_length);
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}
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/* Calculate a hash value for a string encoded in Utf8 format.
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* This returns the same hash value as specified or java.lang.String.hashCode.
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*/
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static jint
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hashUtf8String (char* str, int len)
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{
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register unsigned char* ptr = (unsigned char*) str;
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register unsigned char* limit = ptr + len;
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jint hash = 0;
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for (; ptr < limit;)
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{
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int ch = UTF8_GET (ptr, limit);
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/* Updated specification from
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http://www.javasoft.com/docs/books/jls/clarify.html. */
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hash = (31 * hash) + ch;
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}
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return hash;
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}
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_Jv_Utf8Const *
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_Jv_makeUtf8Const (char* s, int len)
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{
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if (len < 0)
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len = strlen (s);
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Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
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if (! m)
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JvThrow (no_memory);
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memcpy (m->data, s, len);
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m->data[len] = 0;
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m->length = len;
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m->hash = hashUtf8String (s, len) & 0xFFFF;
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return (m);
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}
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#ifdef DEBUG
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void
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_Jv_Abort (const char *function, const char *file, int line,
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const char *message)
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#else
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void
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_Jv_Abort (const char *, const char *, int, const char *message)
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#endif
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{
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#ifdef DEBUG
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fprintf (stderr,
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"libgcj failure: %s\n in function %s, file %s, line %d\n",
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message, function, file, line);
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#else
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java::io::PrintStream *err = java::lang::System::err;
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err->print(JvNewStringLatin1 ("libgcj failure: "));
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err->println(JvNewStringLatin1 (message));
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err->flush();
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#endif
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abort ();
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}
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static void
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fail_on_finalization (jobject)
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{
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JvFail ("object was finalized");
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}
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void
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_Jv_GCWatch (jobject obj)
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{
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_Jv_RegisterFinalizer (obj, fail_on_finalization);
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}
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void
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_Jv_ThrowBadArrayIndex(jint bad_index)
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{
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JvThrow (new java::lang::ArrayIndexOutOfBoundsException
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(java::lang::String::valueOf(bad_index)));
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}
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void*
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_Jv_CheckCast (jclass c, jobject obj)
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{
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if (obj != NULL && ! c->isAssignableFrom(obj->getClass()))
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JvThrow (new java::lang::ClassCastException);
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return obj;
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}
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void
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_Jv_CheckArrayStore (jobject arr, jobject obj)
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{
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if (obj)
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{
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JvAssert (arr != NULL);
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jclass arr_class = arr->getClass();
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JvAssert (arr_class->isArray());
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jclass elt_class = arr_class->getComponentType();
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jclass obj_class = obj->getClass();
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if (! elt_class->isAssignableFrom(obj_class))
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JvThrow (new java::lang::ArrayStoreException);
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}
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}
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// Allocate some unscanned memory and throw an exception if no memory.
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void *
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_Jv_AllocBytesChecked (jsize size)
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{
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void *r = _Jv_AllocBytes (size);
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if (! r)
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_Jv_Throw (no_memory);
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return r;
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}
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// Allocate a new object of class C. SIZE is the size of the object
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// to allocate. You might think this is redundant, but it isn't; some
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// classes, such as String, aren't of fixed size.
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jobject
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_Jv_AllocObject (jclass c, jint size)
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{
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_Jv_InitClass (c);
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jobject obj = (jobject) _Jv_AllocObj (size);
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if (! obj)
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JvThrow (no_memory);
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*((_Jv_VTable **) obj) = c->vtable;
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// If this class has inherited finalize from Object, then don't
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// bother registering a finalizer. We know that finalize() is the
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// very first method after the dummy entry. If this turns out to be
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// unreliable, a more robust implementation can be written. Such an
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// implementation would look for Object.finalize in Object's method
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// table at startup, and then use that information to find the
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// appropriate index in the method vector.
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if (c->vtable->method[1] != ObjectClass.vtable->method[1])
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_Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
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return obj;
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}
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// Allocate a new array of Java objects. Each object is of type
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// `elementClass'. `init' is used to initialize each slot in the
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// array.
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jobjectArray
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_Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
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{
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if (count < 0)
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JvThrow (new java::lang::NegativeArraySizeException);
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// Check for overflow.
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if ((size_t) count > (SIZE_T_MAX - sizeof (__JArray)) / sizeof (jobject))
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JvThrow (no_memory);
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size_t size = count * sizeof (jobject) + sizeof (__JArray);
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jclass clas = _Jv_FindArrayClass (elementClass);
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jobjectArray obj = (jobjectArray) _Jv_AllocArray (size);
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if (! obj)
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JvThrow (no_memory);
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obj->length = count;
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jobject* ptr = elements(obj);
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// We know the allocator returns zeroed memory. So don't bother
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// zeroing it again.
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if (init)
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{
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while (--count >= 0)
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*ptr++ = init;
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}
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// Set the vtbl last to avoid problems if the GC happens during the
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// window in this function between the allocation and this
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// assignment.
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*((_Jv_VTable **) obj) = clas->vtable;
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return obj;
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}
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// Allocate a new array of primitives. ELTYPE is the type of the
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// element, COUNT is the size of the array.
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jobject
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_Jv_NewPrimArray (jclass eltype, jint count)
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{
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int elsize = eltype->size();
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if (count < 0)
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JvThrow (new java::lang::NegativeArraySizeException ());
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// Check for overflow.
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if ((size_t) count > (SIZE_T_MAX - sizeof (__JArray)) / elsize)
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JvThrow (no_memory);
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__JArray *arr = (__JArray*) _Jv_AllocObj (sizeof (__JArray)
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+ elsize * count);
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if (! arr)
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JvThrow (no_memory);
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arr->length = count;
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// Note that we assume we are given zeroed memory by the allocator.
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jclass klass = _Jv_FindArrayClass (eltype);
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// Set the vtbl last to avoid problems if the GC happens during the
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// window in this function between the allocation and this
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// assignment.
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*((_Jv_VTable **) arr) = klass->vtable;
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return arr;
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}
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jcharArray
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JvNewCharArray (jint length)
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{
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return (jcharArray) _Jv_NewPrimArray (JvPrimClass (char), length);
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}
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jbooleanArray
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JvNewBooleanArray (jint length)
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{
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return (jbooleanArray) _Jv_NewPrimArray (JvPrimClass (boolean), length);
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}
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jbyteArray
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JvNewByteArray (jint length)
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{
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return (jbyteArray) _Jv_NewPrimArray (JvPrimClass (byte), length);
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}
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jshortArray
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JvNewShortArray (jint length)
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{
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return (jshortArray) _Jv_NewPrimArray (JvPrimClass (short), length);
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}
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jintArray
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JvNewIntArray (jint length)
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{
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return (jintArray) _Jv_NewPrimArray (JvPrimClass (int), length);
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}
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jlongArray
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JvNewLongArray (jint length)
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{
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return (jlongArray) _Jv_NewPrimArray (JvPrimClass (long), length);
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}
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jfloatArray
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JvNewFloatArray (jint length)
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{
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return (jfloatArray) _Jv_NewPrimArray (JvPrimClass (float), length);
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}
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jdoubleArray
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JvNewDoubleArray (jint length)
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{
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return (jdoubleArray) _Jv_NewPrimArray (JvPrimClass (double), length);
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}
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jobject
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_Jv_NewArray (jint type, jint size)
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{
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switch (type)
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{
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case 4: return JvNewBooleanArray (size);
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case 5: return JvNewCharArray (size);
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case 6: return JvNewFloatArray (size);
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case 7: return JvNewDoubleArray (size);
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case 8: return JvNewByteArray (size);
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case 9: return JvNewShortArray (size);
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case 10: return JvNewIntArray (size);
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case 11: return JvNewLongArray (size);
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}
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JvFail ("newarray - bad type code");
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return NULL; // Placate compiler.
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}
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jobject
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_Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
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{
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JvAssert (type->isArray());
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jclass element_type = type->getComponentType();
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jobject result;
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if (element_type->isPrimitive())
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result = _Jv_NewPrimArray (element_type, sizes[0]);
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else
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result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
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if (dimensions > 1)
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{
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JvAssert (! element_type->isPrimitive());
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JvAssert (element_type->isArray());
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jobject *contents = elements ((jobjectArray) result);
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for (int i = 0; i < sizes[0]; ++i)
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contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
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sizes + 1);
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}
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return result;
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}
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jobject
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_Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
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{
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va_list args;
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jint sizes[dimensions];
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va_start (args, dimensions);
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for (int i = 0; i < dimensions; ++i)
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{
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jint size = va_arg (args, jint);
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sizes[i] = size;
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}
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va_end (args);
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return _Jv_NewMultiArray (array_type, dimensions, sizes);
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}
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#ifdef HANDLE_SEGV
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static java::lang::NullPointerException *nullp;
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static void
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catch_segv (int)
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{
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// Don't run `new' in a signal handler, so we always throw the same
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// null pointer exception.
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_Jv_Throw (nullp);
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}
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#endif /* HANDLE_SEGV */
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class _Jv_PrimClass : public java::lang::Class
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{
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public:
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// FIXME: calling convention is weird. If we use the natural types
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// then the compiler will complain because they aren't Java types.
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_Jv_PrimClass (jobject cname, jbyte sig, jint len)
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{
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using namespace java::lang::reflect;
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// We must initialize every field of the class. We do this in
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// the same order they are declared in Class.h.
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next = NULL;
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name = _Jv_makeUtf8Const ((char *) cname, -1);
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accflags = Modifier::PUBLIC | Modifier::FINAL;
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superclass = NULL;
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constants.size = 0;
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constants.tags = NULL;
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constants.data = NULL;
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methods = NULL;
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method_count = sig;
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vtable_method_count = 0;
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fields = NULL;
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size_in_bytes = len;
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field_count = 0;
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static_field_count = 0;
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vtable = JV_PRIMITIVE_VTABLE;
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interfaces = NULL;
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loader = NULL;
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interface_count = 0;
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state = 0; // FIXME.
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thread = NULL;
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}
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};
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#define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
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_Jv_PrimClass _Jv_##NAME##Class((jobject) #NAME, (jbyte) SIG, (jint) LEN)
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DECLARE_PRIM_TYPE(byte, 'B', 1);
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DECLARE_PRIM_TYPE(short, 'S', 2);
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DECLARE_PRIM_TYPE(int, 'I', 4);
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DECLARE_PRIM_TYPE(long, 'J', 8);
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DECLARE_PRIM_TYPE(boolean, 'Z', 1);
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DECLARE_PRIM_TYPE(char, 'C', 2);
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DECLARE_PRIM_TYPE(float, 'F', 4);
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DECLARE_PRIM_TYPE(double, 'D', 8);
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DECLARE_PRIM_TYPE(void, 'V', 0);
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jclass
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_Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
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{
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switch (*sig)
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{
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case 'B':
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return JvPrimClass (byte);
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case 'S':
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return JvPrimClass (short);
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case 'I':
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return JvPrimClass (int);
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case 'J':
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return JvPrimClass (long);
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case 'Z':
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return JvPrimClass (boolean);
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case 'C':
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return JvPrimClass (char);
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case 'F':
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return JvPrimClass (float);
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case 'D':
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return JvPrimClass (double);
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case 'V':
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return JvPrimClass (void);
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case 'L':
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{
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int i;
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for (i = 1; sig[i] && sig[i] != ';'; ++i)
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;
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_Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
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return _Jv_FindClass (name, loader);
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}
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case '[':
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return _Jv_FindArrayClass (_Jv_FindClassFromSignature (&sig[1], loader));
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}
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JvFail ("couldn't understand class signature");
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return NULL; // Placate compiler.
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}
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JArray<jstring> *
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JvConvertArgv (int argc, const char **argv)
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{
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if (argc < 0)
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argc = 0;
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jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
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jobject* ptr = elements(ar);
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for (int i = 0; i < argc; i++)
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{
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const char *arg = argv[i];
|
||
// FIXME - should probably use JvNewStringUTF.
|
||
*ptr++ = JvNewStringLatin1(arg, strlen(arg));
|
||
}
|
||
return (JArray<jstring>*) ar;
|
||
}
|
||
|
||
// FIXME: These variables are static so that they will be
|
||
// automatically scanned by the Boehm collector. This is needed
|
||
// because with qthreads the collector won't scan the initial stack --
|
||
// it will only scan the qthreads stacks.
|
||
|
||
// Command line arguments.
|
||
static jobject arg_vec;
|
||
|
||
// The primary threadgroup.
|
||
static java::lang::ThreadGroup *main_group;
|
||
|
||
// The primary thread.
|
||
static java::lang::Thread *main_thread;
|
||
|
||
void
|
||
JvRunMain (jclass klass, int argc, const char **argv)
|
||
{
|
||
#ifdef HANDLE_SEGV
|
||
nullp = new java::lang::NullPointerException ();
|
||
|
||
struct sigaction act;
|
||
act.sa_handler = catch_segv;
|
||
sigemptyset (&act.sa_mask);
|
||
act.sa_flags = 0;
|
||
sigaction (SIGSEGV, &act, NULL);
|
||
#endif
|
||
|
||
no_memory = new java::lang::OutOfMemoryError;
|
||
|
||
arg_vec = JvConvertArgv (argc - 1, argv + 1);
|
||
main_group = new java::lang::ThreadGroup (23);
|
||
main_thread = new java::lang::FirstThread (main_group, klass, arg_vec);
|
||
|
||
main_thread->start();
|
||
_Jv_ThreadWait ();
|
||
|
||
java::lang::Runtime::getRuntime ()->exit (0);
|
||
}
|
||
|
||
|
||
|
||
void *
|
||
_Jv_Malloc (jsize size)
|
||
{
|
||
if (size == 0)
|
||
size = 1;
|
||
void *ptr = malloc ((size_t) size);
|
||
if (ptr == NULL)
|
||
JvThrow (no_memory);
|
||
return ptr;
|
||
}
|
||
|
||
void
|
||
_Jv_Free (void* ptr)
|
||
{
|
||
return free (ptr);
|
||
}
|