1 // java-interp.h - Header file for the bytecode interpreter. -*- c++ -*-
3 /* Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation
5 This file is part of libgcj.
7 This software is copyrighted work licensed under the terms of the
8 Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
11 #ifndef __JAVA_INTERP_H__
12 #define __JAVA_INTERP_H__
15 #include <java-cpool.h>
16 #include <gnu/gcj/runtime/NameFinder.h>
22 #include <java/lang/Class.h>
23 #include <java/lang/ClassLoader.h>
24 #include <java/lang/reflect/Modifier.h>
25 #include <gnu/gcj/runtime/StackTrace.h>
31 extern inline jboolean
32 _Jv_IsInterpretedClass (jclass c)
34 return (c->accflags & java::lang::reflect::Modifier::INTERPRETED) != 0;
37 struct _Jv_ResolvedMethod;
39 void _Jv_DefineClass (jclass, jbyteArray, jint, jint);
41 void _Jv_InitField (jobject, jclass, int);
42 void * _Jv_AllocMethodInvocation (jsize size);
43 int _Jv_count_arguments (_Jv_Utf8Const *signature,
44 jboolean staticp = true);
45 void _Jv_VerifyMethod (_Jv_InterpMethod *method);
47 /* FIXME: this should really be defined in some more generic place */
48 #define ROUND(V, A) (((((unsigned) (V))-1) | ((A)-1))+1)
50 /* the interpreter is written in C++, primarily because it makes it easy for
51 * the entire thing to be "friend" with class Class. */
53 class _Jv_InterpClass;
54 class _Jv_InterpMethod;
56 // Before a method is "compiled" we store values as the bytecode PC,
57 // an int. Afterwards we store them as pointers into the prepared
65 class _Jv_InterpException
67 _Jv_InterpPC start_pc;
69 _Jv_InterpPC handler_pc;
70 _Jv_InterpPC handler_type;
72 friend class _Jv_ClassReader;
73 friend class _Jv_InterpMethod;
74 friend class _Jv_BytecodeVerifier;
77 // Base class for method representations. Subclasses are interpreted
82 // The class which defined this method.
83 _Jv_InterpClass *defining_class;
85 // The method description.
88 // Size of raw arguments.
89 _Jv_ushort args_raw_size;
92 _Jv_Method *get_method ()
98 class _Jv_InterpMethod : public _Jv_MethodBase
100 _Jv_ushort max_stack;
101 _Jv_ushort max_locals;
104 _Jv_ushort exc_count;
108 unsigned char* bytecode ()
111 ((unsigned char*)this)
112 + ROUND((sizeof (_Jv_InterpMethod)
113 + exc_count*sizeof (_Jv_InterpException)), 4);
116 _Jv_InterpException * exceptions ()
118 return (_Jv_InterpException*) (this+1);
121 static size_t size (int exc_count, int code_length)
124 ROUND ((sizeof (_Jv_InterpMethod)
125 + (exc_count * sizeof (_Jv_InterpException))), 4)
129 // return the method's invocation pointer (a stub).
131 void compile (const void * const *);
133 static void run_normal (ffi_cif*, void*, ffi_raw*, void*);
134 static void run_synch_object (ffi_cif*, void*, ffi_raw*, void*);
135 static void run_class (ffi_cif*, void*, ffi_raw*, void*);
136 static void run_synch_class (ffi_cif*, void*, ffi_raw*, void*);
138 void run (void*, ffi_raw *);
141 static void dump_object(jobject o);
143 friend class _Jv_ClassReader;
144 friend class _Jv_BytecodeVerifier;
145 friend class gnu::gcj::runtime::NameFinder;
146 friend class gnu::gcj::runtime::StackTrace;
148 friend void _Jv_PrepareClass(jclass);
150 #ifdef JV_MARKOBJ_DECL
151 friend JV_MARKOBJ_DECL;
155 class _Jv_InterpClass : public java::lang::Class
157 _Jv_MethodBase **interpreted_methods;
158 _Jv_ushort *field_initializers;
160 friend class _Jv_ClassReader;
161 friend class _Jv_InterpMethod;
162 friend void _Jv_PrepareClass(jclass);
163 friend void _Jv_PrepareMissingMethods (jclass base2, jclass iface_class);
164 friend void _Jv_InitField (jobject, jclass, int);
165 #ifdef JV_MARKOBJ_DECL
166 friend JV_MARKOBJ_DECL;
169 friend _Jv_MethodBase ** _Jv_GetFirstMethod (_Jv_InterpClass *klass);
172 extern inline _Jv_MethodBase **
173 _Jv_GetFirstMethod (_Jv_InterpClass *klass)
175 return klass->interpreted_methods;
178 struct _Jv_ResolvedMethod {
179 jint stack_item_count;
184 // a resolved method holds the cif in-line, so that _Jv_MarkObj just needs
185 // to mark the resolved method to hold on to the cif. Some memory could be
186 // saved by keeping a cache of cif's, since many will be the same.
188 ffi_type * arg_types[0];
191 class _Jv_JNIMethod : public _Jv_MethodBase
193 // The underlying function. If NULL we have to look for the
197 // This is the CIF used by the JNI function.
200 // These are the argument types used by the JNI function.
201 ffi_type **jni_arg_types;
203 // This function is used when making a JNI call from the interpreter.
204 static void call (ffi_cif *, void *, ffi_raw *, void *);
208 friend class _Jv_ClassReader;
209 friend void _Jv_PrepareClass(jclass);
212 // FIXME: this is ugly.
213 void set_function (void *f)
219 // A structure of this type is used to link together interpreter
220 // invocations on the stack.
221 struct _Jv_MethodChain
223 const _Jv_InterpMethod *self;
224 _Jv_MethodChain **ptr;
225 _Jv_MethodChain *next;
227 _Jv_MethodChain (const _Jv_InterpMethod *s, _Jv_MethodChain **n)
241 #endif /* INTERPRETER */
243 #endif /* __JAVA_INTERP_H__ */