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290 lines
10 KiB
C++
290 lines
10 KiB
C++
// jvm.h - Header file for private implementation information. -*- c++ -*-
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/* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation
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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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#ifndef __JAVA_JVM_H__
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#define __JAVA_JVM_H__
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#include <gcj/javaprims.h>
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#include <java-assert.h>
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#include <java-threads.h>
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// Must include java-gc.h before Object.h for the implementation.
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#include <java-gc.h>
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#include <java/lang/Object.h>
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// Include cni.h before field.h to enable all definitions. FIXME.
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#include <gcj/cni.h>
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#include <gcj/field.h>
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/* Structure of the virtual table. */
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struct _Jv_VTable
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{
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jclass clas;
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void *gc_descr;
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void *method[1];
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void *get_finalizer() { return method[0]; }
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};
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// Number of virtual methods on object. FIXME: it sucks that we have
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// to keep this up to date by hand.
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#define NUM_OBJECT_METHODS 5
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// This structure is the type of an array's vtable.
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struct _Jv_ArrayVTable
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{
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jclass clas;
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void *gc_descr;
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void *method[NUM_OBJECT_METHODS];
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void *get_finalizer() { return method[0]; }
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};
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union _Jv_word
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{
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jobject o;
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jint i; // Also stores smaller integral types.
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jfloat f;
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jint ia[1]; // Half of _Jv_word2.
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void* p;
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#if SIZEOF_VOID_P == 8
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// We can safely put a long or a double in here without increasing
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// the size of _Jv_Word; we take advantage of this in the interpreter.
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jlong l;
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jdouble d;
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#endif
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jclass clazz;
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jstring string;
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struct _Jv_Field *field;
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struct _Jv_Utf8Const *utf8;
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struct _Jv_ResolvedMethod *rmethod;
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};
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union _Jv_word2
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{
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jint ia[2];
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jlong l;
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jdouble d;
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};
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/* Extract a character from a Java-style Utf8 string.
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* PTR points to the current character.
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* LIMIT points to the end of the Utf8 string.
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* PTR is incremented to point after the character thta gets returns.
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* On an error, -1 is returned. */
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#define UTF8_GET(PTR, LIMIT) \
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((PTR) >= (LIMIT) ? -1 \
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: *(PTR) < 128 ? *(PTR)++ \
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: (*(PTR)&0xE0) == 0xC0 && ((PTR)+=2)<=(LIMIT) && ((PTR)[-1]&0xC0) == 0x80 \
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? (((PTR)[-2] & 0x1F) << 6) + ((PTR)[-1] & 0x3F) \
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: (*(PTR) & 0xF0) == 0xE0 && ((PTR) += 3) <= (LIMIT) \
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&& ((PTR)[-2] & 0xC0) == 0x80 && ((PTR)[-1] & 0xC0) == 0x80 \
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? (((PTR)[-3]&0x0F) << 12) + (((PTR)[-2]&0x3F) << 6) + ((PTR)[-1]&0x3F) \
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: ((PTR)++, -1))
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extern int _Jv_strLengthUtf8(char* str, int len);
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typedef struct _Jv_Utf8Const Utf8Const;
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_Jv_Utf8Const *_Jv_makeUtf8Const (char *s, int len);
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_Jv_Utf8Const *_Jv_makeUtf8Const (jstring string);
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extern jboolean _Jv_equalUtf8Consts (_Jv_Utf8Const *, _Jv_Utf8Const *);
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extern jboolean _Jv_equal (_Jv_Utf8Const *, jstring, jint);
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extern jboolean _Jv_equaln (_Jv_Utf8Const *, jstring, jint);
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// FIXME: remove this define.
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#define StringClass java::lang::String::class$
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/* Type of pointer used as finalizer. */
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typedef void _Jv_FinalizerFunc (jobject);
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/* Allocate space for a new Java object. */
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void *_Jv_AllocObj (jsize size, jclass cl) __attribute__((__malloc__));
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/* Allocate space for a potentially uninitialized pointer-free object.
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Interesting only with JV_HASH_SYNCHRONIZATION. */
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void *_Jv_AllocPtrFreeObj (jsize size, jclass cl) __attribute__((__malloc__));
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/* Allocate space for an array of Java objects. */
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void *_Jv_AllocArray (jsize size, jclass cl) __attribute__((__malloc__));
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/* Allocate space that is known to be pointer-free. */
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void *_Jv_AllocBytes (jsize size) __attribute__((__malloc__));
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/* Explicitly throw an out-of-memory exception. */
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void _Jv_ThrowNoMemory() __attribute__((__noreturn__));
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/* Allocate an object with a single pointer. The first word is reserved
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for the GC, and the second word is the traced pointer. */
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void *_Jv_AllocTraceOne (jsize size /* incl. reserved slot */);
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/* Initialize the GC. */
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void _Jv_InitGC (void);
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/* Register a finalizer. */
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void _Jv_RegisterFinalizer (void *object, _Jv_FinalizerFunc *method);
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/* Compute the GC descriptor for a class */
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#ifdef INTERPRETER
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void * _Jv_BuildGCDescr(jclass);
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#endif
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/* Allocate some unscanned, unmoveable memory. Return NULL if out of
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memory. */
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void *_Jv_MallocUnchecked (jsize size) __attribute__((__malloc__));
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/* Run finalizers for objects ready to be finalized.. */
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void _Jv_RunFinalizers (void);
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/* Run all finalizers. Should be called only before exit. */
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void _Jv_RunAllFinalizers (void);
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/* Perform a GC. */
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void _Jv_RunGC (void);
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/* Disable and enable GC. */
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void _Jv_DisableGC (void);
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void _Jv_EnableGC (void);
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/* Return approximation of total size of heap. */
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long _Jv_GCTotalMemory (void);
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/* Return approximation of total free memory. */
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long _Jv_GCFreeMemory (void);
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/* Set initial heap size. If SIZE==0, ignore. Should be run before
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_Jv_InitGC. Not required to have any actual effect. */
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void _Jv_GCSetInitialHeapSize (size_t size);
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/* Set maximum heap size. If SIZE==0, unbounded. Should be run
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before _Jv_InitGC. Not required to have any actual effect. */
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void _Jv_GCSetMaximumHeapSize (size_t size);
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/* External interface to setting the heap size. Parses ARG (a number
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which can optionally have "k" or "m" appended and calls
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_Jv_GCSetInitialHeapSize. */
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void _Jv_SetInitialHeapSize (const char *arg);
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/* External interface to setting the maximum heap size. Parses ARG (a
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number which can optionally have "k" or "m" appended and calls
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_Jv_GCSetMaximumHeapSize. */
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void _Jv_SetMaximumHeapSize (const char *arg);
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extern "C" void JvRunMain (jclass klass, int argc, const char **argv);
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void _Jv_RunMain (const char* name, int argc, const char **argv, bool is_jar);
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// This function is used to determine the hash code of an object.
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inline jint
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_Jv_HashCode (jobject obj)
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{
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// This was chosen to yield relatively well distributed results on
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// both 32- and 64-bit architectures. Note 0x7fffffff is prime.
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// FIXME: we assume sizeof(long) == sizeof(void *).
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return (jint) ((unsigned long) obj % 0x7fffffff);
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}
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// Return a raw pointer to the elements of an array given the array
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// and its element type. You might think we could just pick a single
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// array type and use elements() on it, but we can't because we must
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// account for alignment of the element type. When ARRAY is null, we
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// obtain the number of bytes taken by the base part of the array.
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inline char *
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_Jv_GetArrayElementFromElementType (jobject array,
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jclass element_type)
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{
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char *elts;
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if (element_type == JvPrimClass (byte))
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elts = (char *) elements ((jbyteArray) array);
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else if (element_type == JvPrimClass (short))
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elts = (char *) elements ((jshortArray) array);
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else if (element_type == JvPrimClass (int))
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elts = (char *) elements ((jintArray) array);
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else if (element_type == JvPrimClass (long))
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elts = (char *) elements ((jlongArray) array);
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else if (element_type == JvPrimClass (boolean))
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elts = (char *) elements ((jbooleanArray) array);
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else if (element_type == JvPrimClass (char))
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elts = (char *) elements ((jcharArray) array);
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else if (element_type == JvPrimClass (float))
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elts = (char *) elements ((jfloatArray) array);
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else if (element_type == JvPrimClass (double))
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elts = (char *) elements ((jdoubleArray) array);
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else
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elts = (char *) elements ((jobjectArray) array);
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return elts;
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}
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extern "C" void _Jv_ThrowBadArrayIndex (jint bad_index);
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extern "C" void _Jv_ThrowNullPointerException (void);
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extern "C" jobject _Jv_NewArray (jint type, jint size)
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__attribute__((__malloc__));
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extern "C" jobject _Jv_NewMultiArray (jclass klass, jint dims, ...)
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__attribute__((__malloc__));
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extern "C" void *_Jv_CheckCast (jclass klass, jobject obj);
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extern "C" void *_Jv_LookupInterfaceMethod (jclass klass, Utf8Const *name,
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Utf8Const *signature);
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extern "C" void *_Jv_LookupInterfaceMethodIdx (jclass klass, jclass iface,
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int meth_idx);
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extern "C" void _Jv_CheckArrayStore (jobject array, jobject obj);
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extern "C" void _Jv_RegisterClass (jclass klass);
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extern "C" void _Jv_RegisterClasses (jclass *classes);
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extern void _Jv_UnregisterClass (_Jv_Utf8Const*, java::lang::ClassLoader*);
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extern void _Jv_ResolveField (_Jv_Field *, java::lang::ClassLoader*);
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extern jclass _Jv_FindClass (_Jv_Utf8Const *name,
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java::lang::ClassLoader *loader);
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extern jclass _Jv_FindClassFromSignature (char *,
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java::lang::ClassLoader *loader);
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extern void _Jv_GetTypesFromSignature (jmethodID method,
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jclass declaringClass,
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JArray<jclass> **arg_types_out,
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jclass *return_type_out);
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extern jobject _Jv_CallAnyMethodA (jobject obj, jclass return_type,
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jmethodID meth, jboolean is_constructor,
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JArray<jclass> *parameter_types,
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jobjectArray args);
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union jvalue;
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extern jthrowable _Jv_CallAnyMethodA (jobject obj,
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jclass return_type,
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jmethodID meth,
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jboolean is_constructor,
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JArray<jclass> *parameter_types,
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jvalue *args,
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jvalue *result);
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extern jobject _Jv_NewMultiArray (jclass, jint ndims, jint* dims)
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__attribute__((__malloc__));
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/* Checked divide subroutines. */
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extern "C"
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{
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jint _Jv_divI (jint, jint);
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jint _Jv_remI (jint, jint);
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jlong _Jv_divJ (jlong, jlong);
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jlong _Jv_remJ (jlong, jlong);
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}
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/* get/set the name of the running executable. */
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extern char *_Jv_ThisExecutable (void);
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extern void _Jv_ThisExecutable (const char *);
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/* Return a pointer to a symbol in executable or loaded library. */
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void *_Jv_FindSymbolInExecutable (const char *);
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/* Initialize JNI. */
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extern void _Jv_JNI_Init (void);
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/* Get or set the per-thread JNIEnv used by the invocation API. */
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_Jv_JNIEnv *_Jv_GetCurrentJNIEnv ();
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void _Jv_SetCurrentJNIEnv (_Jv_JNIEnv *);
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struct _Jv_JavaVM;
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_Jv_JavaVM *_Jv_GetJavaVM ();
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#ifdef ENABLE_JVMPI
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#include "jvmpi.h"
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extern void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
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extern void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
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extern void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
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#endif
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#endif /* __JAVA_JVM_H__ */
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