589 lines
20 KiB
C++
589 lines
20 KiB
C++
// jvm.h - Header file for private implementation information. -*- c++ -*-
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/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 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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// Define this before including jni.h.
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// jni.h is included by jvmpi.h, which might be included. We define
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// this unconditionally because it is convenient and it lets other
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// files include jni.h without difficulty.
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#define __GCJ_JNI_IMPL__
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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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/* Macro for possible unused arguments. */
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#define MAYBE_UNUSED __attribute__((__unused__))
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/* Structure of the virtual table. */
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struct _Jv_VTable
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{
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#ifdef __ia64__
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typedef struct { void *pc, *gp; } vtable_elt;
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#else
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typedef void *vtable_elt;
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#endif
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jclass clas;
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void *gc_descr;
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// This must be last, as derived classes "extend" this by
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// adding new data members.
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vtable_elt method[1];
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#ifdef __ia64__
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void *get_method(int i) { return &method[i]; }
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void set_method(int i, void *fptr) { method[i] = *(vtable_elt *)fptr; }
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void *get_finalizer()
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{
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// We know that get_finalizer is only used for checking whether
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// this object needs to have a finalizer registered. So it is
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// safe to simply return just the PC component of the vtable
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// slot.
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return ((vtable_elt *)(get_method(0)))->pc;
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}
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#else
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void *get_method(int i) { return method[i]; }
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void set_method(int i, void *fptr) { method[i] = fptr; }
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void *get_finalizer() { return get_method(0); }
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#endif
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static size_t vtable_elt_size() { return sizeof(vtable_elt); }
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// Given a method index, return byte offset from the vtable pointer.
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static jint idx_to_offset (int index)
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{
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return (2 * sizeof (void *)) + (index * vtable_elt_size ());
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}
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static _Jv_VTable *new_vtable (int count);
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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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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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union _Jv_value
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{
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jbyte byte_value;
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jshort short_value;
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jchar char_value;
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jint int_value;
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jlong long_value;
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jfloat float_value;
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jdouble double_value;
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jobject object_value;
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};
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// An instance of this type is used to represent a single frame in a
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// backtrace. If the interpreter has been built, we also include
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// information about the interpreted method.
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struct _Jv_frame_info
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{
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// PC value.
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void *addr;
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#ifdef INTERPRETER
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// Actually a _Jv_InterpMethod, but we don't want to include
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// java-interp.h everywhere.
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void *interp;
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#endif // INTERPRETER
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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 (const _Jv_Utf8Const *, const _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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/* Helper class which converts a jstring to a temporary char*.
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Uses the supplied buffer, if non-null. Otherwise, allocates
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the buffer on the heap. Use the JV_TEMP_UTF_STRING macro,
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which follows, to automatically allocate a stack buffer if
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the string is small enough. */
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class _Jv_TempUTFString
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{
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public:
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_Jv_TempUTFString(jstring jstr, char* buf=0);
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~_Jv_TempUTFString();
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// Accessors
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operator const char*() const
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{
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return buf_;
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}
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const char* buf() const
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{
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return buf_;
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}
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char* buf()
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{
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return buf_;
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}
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private:
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char* buf_;
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bool heapAllocated_;
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};
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inline _Jv_TempUTFString::_Jv_TempUTFString (jstring jstr, char* buf)
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: buf_(0), heapAllocated_(false)
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{
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if (!jstr) return;
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jsize len = JvGetStringUTFLength (jstr);
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if (buf)
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buf_ = buf;
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else
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{
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buf_ = (char*) _Jv_Malloc (len+1);
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heapAllocated_ = true;
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}
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JvGetStringUTFRegion (jstr, 0, jstr->length(), buf_);
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buf_[len] = '\0';
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}
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inline _Jv_TempUTFString::~_Jv_TempUTFString ()
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{
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if (heapAllocated_)
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_Jv_Free (buf_);
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}
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/* Macro which uses _Jv_TempUTFString. Allocates a stack-based
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buffer if the string and its null terminator are <= 256
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characters in length. Otherwise, a heap-based buffer is
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used. The parameters to this macro are the variable name
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which is an instance of _Jv_TempUTFString (above) and a
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jstring.
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Sample Usage:
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jstring jstr = getAJString();
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JV_TEMP_UTF_STRING(utfstr, jstr);
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printf("The string is: %s\n", utfstr.buf());
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*/
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#define JV_TEMP_UTF_STRING(utfstr, jstr) \
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jstring utfstr##thejstr = (jstr); \
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jsize utfstr##_len = utfstr##thejstr ? JvGetStringUTFLength (utfstr##thejstr) + 1 : 0; \
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char utfstr##_buf[utfstr##_len <= 256 ? utfstr##_len : 0]; \
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_Jv_TempUTFString utfstr(utfstr##thejstr, sizeof(utfstr##_buf)==0 ? 0 : utfstr##_buf)
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namespace gcj
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{
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/* Some constants used during lookup of special class methods. */
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extern _Jv_Utf8Const *void_signature; /* "()V" */
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extern _Jv_Utf8Const *clinit_name; /* "<clinit>" */
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extern _Jv_Utf8Const *init_name; /* "<init>" */
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extern _Jv_Utf8Const *finit_name; /* "finit$", */
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/* Set to true by _Jv_CreateJavaVM. */
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extern bool runtimeInitialized;
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/* Print out class names as they are initialized. */
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extern bool verbose_class_flag;
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}
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// This class handles all aspects of class preparation and linking.
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class _Jv_Linker
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{
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private:
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static _Jv_Field *find_field_helper(jclass, _Jv_Utf8Const *, jclass *);
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static _Jv_Field *find_field(jclass, jclass, _Jv_Utf8Const *,
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_Jv_Utf8Const *);
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static void prepare_constant_time_tables(jclass);
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static jshort get_interfaces(jclass, _Jv_ifaces *);
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static void link_symbol_table(jclass);
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static void link_exception_table(jclass);
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static void layout_interface_methods(jclass);
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static void layout_vtable_methods(jclass);
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static void set_vtable_entries(jclass, _Jv_VTable *);
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static void make_vtable(jclass);
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static void ensure_fields_laid_out(jclass);
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static void ensure_class_linked(jclass);
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static void ensure_supers_installed(jclass);
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static void add_miranda_methods(jclass, jclass);
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static void ensure_method_table_complete(jclass);
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static void verify_class(jclass);
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static jshort find_iindex(jclass *, jshort *, jshort);
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static jshort indexof(void *, void **, jshort);
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static int get_alignment_from_class(jclass);
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static void generate_itable(jclass, _Jv_ifaces *, jshort *);
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static jshort append_partial_itable(jclass, jclass, void **, jshort);
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static _Jv_Method *search_method_in_class (jclass, jclass,
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_Jv_Utf8Const *,
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_Jv_Utf8Const *);
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public:
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static bool has_field_p (jclass, _Jv_Utf8Const *);
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static void print_class_loaded (jclass);
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static void resolve_class_ref (jclass, jclass *);
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static void wait_for_state(jclass, int);
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static _Jv_word resolve_pool_entry (jclass, int);
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static void resolve_field (_Jv_Field *, java::lang::ClassLoader *);
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static void verify_type_assertions (jclass);
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};
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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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/* Allocate space for a new non-Java object, which does not have the usual
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Java object header but may contain pointers to other GC'ed objects. */
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void *_Jv_AllocRawObj (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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/* Ditto, but for two traced pointers. */
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void *_Jv_AllocTraceTwo (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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void * _Jv_BuildGCDescr(jclass);
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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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/* Initialize finalizers. The argument is a function to be called
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when a finalizer is ready to be run. */
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void _Jv_GCInitializeFinalizers (void (*notifier) (void));
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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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/* Register a disappearing link. This is a field F which should be
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cleared when *F is found to be inaccessible. This is used in the
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implementation of java.lang.ref.Reference. */
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void _Jv_GCRegisterDisappearingLink (jobject *objp);
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/* Return true if OBJECT should be reclaimed. This is used to
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implement soft references. */
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jboolean _Jv_GCCanReclaimSoftReference (jobject obj);
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/* Register a finalizer for a String object. This is only used by
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the intern() implementation. */
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void _Jv_RegisterStringFinalizer (jobject str);
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/* This is called to actually finalize a possibly-intern()d String. */
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void _Jv_FinalizeString (jobject str);
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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 (jclass klass, const char *name, int argc, const char **argv,
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bool is_jar);
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// Delayed until after _Jv_AllocBytes is declared.
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//
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// Note that we allocate this as unscanned memory -- the vtables
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// are handled specially by the GC.
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inline _Jv_VTable *
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_Jv_VTable::new_vtable (int count)
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{
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size_t size = sizeof(_Jv_VTable) + (count - 1) * vtable_elt_size ();
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return (_Jv_VTable *) _Jv_AllocBytes (size);
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}
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// Determine if METH gets an entry in a VTable.
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static inline jboolean _Jv_isVirtualMethod (_Jv_Method *meth)
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{
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using namespace java::lang::reflect;
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return (((meth->accflags & (Modifier::STATIC | Modifier::PRIVATE)) == 0)
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&& meth->name->first() != '<');
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}
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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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__attribute__((noreturn));
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extern "C" void _Jv_ThrowNullPointerException (void)
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__attribute__((noreturn));
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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 (const jclass *classes);
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extern "C" void _Jv_RegisterClasses_Counted (const jclass *classes,
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size_t count);
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extern "C" void _Jv_RegisterResource (void *vptr);
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extern void _Jv_UnregisterClass (_Jv_Utf8Const*, 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 jboolean _Jv_CheckAccess (jclass self_klass, jclass other_klass,
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jint flags);
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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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jclass iface = NULL);
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union jvalue;
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extern void _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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jboolean is_virtual_call,
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JArray<jclass> *parameter_types,
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jvalue *args,
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jvalue *result,
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jboolean is_jni_call = true,
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jclass iface = NULL);
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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 the number of arguments (cf. argc) or 0 if our argument
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list was never initialized. */
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extern int _Jv_GetNbArgs (void);
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/* Get the specified argument (cf. argv[index]) or "" if either
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our argument list was never initialized or the specified index
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is out of bounds. */
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extern const char * _Jv_GetSafeArg (int index);
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/* Sets our argument list. Can be used by programs with non-standard
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entry points. */
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extern void _Jv_SetArgs (int argc, const char **argv);
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/* Get the name of the running executable. */
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extern const char *_Jv_ThisExecutable (void);
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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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/* Free a JNIEnv. */
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void _Jv_FreeJNIEnv (_Jv_JNIEnv *);
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|
/* Free a JNIEnv. */
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|
void _Jv_FreeJNIEnv (_Jv_JNIEnv *);
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struct _Jv_JavaVM;
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|
_Jv_JavaVM *_Jv_GetJavaVM ();
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// Some verification functions from defineclass.cc.
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|
bool _Jv_VerifyFieldSignature (_Jv_Utf8Const*sig);
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bool _Jv_VerifyMethodSignature (_Jv_Utf8Const*sig);
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bool _Jv_VerifyClassName (unsigned char* ptr, _Jv_ushort length);
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bool _Jv_VerifyClassName (_Jv_Utf8Const *name);
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bool _Jv_VerifyIdentifier (_Jv_Utf8Const *);
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bool _Jv_ClassNameSamePackage (_Jv_Utf8Const *name1, _Jv_Utf8Const *name2);
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|
|
struct _Jv_core_chain
|
|
{
|
|
int name_length;
|
|
const char *name;
|
|
int data_length;
|
|
const void *data;
|
|
|
|
struct _Jv_core_chain *next;
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|
};
|
|
|
|
// This is called when new core data is loaded.
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|
extern void (*_Jv_RegisterCoreHook) (_Jv_core_chain *);
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|
|
|
_Jv_core_chain *_Jv_FindCore (_Jv_core_chain *node, jstring name);
|
|
void _Jv_FreeCoreChain (_Jv_core_chain *chain);
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|
|
|
#ifdef ENABLE_JVMPI
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|
|
|
#include "jvmpi.h"
|
|
|
|
extern void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
|
|
extern void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
|
|
extern void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
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|
#endif
|
|
|
|
/* FIXME: this should really be defined in some more generic place */
|
|
#define ROUND(V, A) (((((unsigned) (V))-1) | ((A)-1))+1)
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|
|
|
extern void _Jv_RegisterBootstrapPackages ();
|
|
|
|
|
|
// This is used to find ABI versions we recognize.
|
|
#define GCJ_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 10)
|
|
#define GCJ_BINARYCOMPAT_ADDITION 5
|
|
|
|
inline bool
|
|
_Jv_CheckABIVersion (unsigned long value)
|
|
{
|
|
// For this release, recognize just our defined C++ ABI and our
|
|
// defined BC ABI. (In the future we may recognize past BC ABIs as
|
|
// well.)
|
|
return (value == GCJ_VERSION
|
|
|| value == (GCJ_VERSION + GCJ_BINARYCOMPAT_ADDITION));
|
|
}
|
|
|
|
#endif /* __JAVA_JVM_H__ */
|