241 lines
5.4 KiB
C++
241 lines
5.4 KiB
C++
// java-interp.h - Header file for the bytecode interpreter. -*- c++ -*-
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/* Copyright (C) 1999, 2000, 2001, 2002 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_INTERP_H__
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#define __JAVA_INTERP_H__
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#include <jvm.h>
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#include <java-cpool.h>
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#include <gnu/gcj/runtime/NameFinder.h>
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#ifdef INTERPRETER
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#pragma interface
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#include <java/lang/Class.h>
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#include <java/lang/ClassLoader.h>
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#include <gnu/gcj/runtime/StackTrace.h>
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extern "C" {
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#include <ffi.h>
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}
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extern inline jboolean
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_Jv_IsInterpretedClass (jclass c)
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{
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return (c->loader != 0);
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}
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struct _Jv_ResolvedMethod;
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void _Jv_DefineClass (jclass, jbyteArray, jint, jint);
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void _Jv_InitField (jobject, jclass, int);
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void * _Jv_AllocMethodInvocation (jsize size);
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int _Jv_count_arguments (_Jv_Utf8Const *signature,
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jboolean staticp = true);
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void _Jv_VerifyMethod (_Jv_InterpMethod *method);
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/* FIXME: this should really be defined in some more generic place */
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#define ROUND(V, A) (((((unsigned) (V))-1) | ((A)-1))+1)
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/* the interpreter is written in C++, primarily because it makes it easy for
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* the entire thing to be "friend" with class Class. */
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class _Jv_InterpClass;
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class _Jv_InterpMethod;
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// Before a method is "compiled" we store values as the bytecode PC,
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// an int. Afterwards we store them as pointers into the prepared
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// code itself.
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union _Jv_InterpPC
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{
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int i;
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void *p;
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};
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class _Jv_InterpException
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{
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_Jv_InterpPC start_pc;
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_Jv_InterpPC end_pc;
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_Jv_InterpPC handler_pc;
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_Jv_InterpPC handler_type;
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friend class _Jv_ClassReader;
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friend class _Jv_InterpMethod;
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friend class _Jv_BytecodeVerifier;
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};
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// Base class for method representations. Subclasses are interpreted
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// and JNI methods.
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class _Jv_MethodBase
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{
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protected:
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// The class which defined this method.
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_Jv_InterpClass *defining_class;
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// The method description.
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_Jv_Method *self;
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// Size of raw arguments.
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_Jv_ushort args_raw_size;
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public:
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_Jv_Method *get_method ()
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{
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return self;
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}
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};
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class _Jv_InterpMethod : public _Jv_MethodBase
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{
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_Jv_ushort max_stack;
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_Jv_ushort max_locals;
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int code_length;
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_Jv_ushort exc_count;
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void *prepared;
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unsigned char* bytecode ()
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{
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return
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((unsigned char*)this)
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+ ROUND((sizeof (_Jv_InterpMethod)
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+ exc_count*sizeof (_Jv_InterpException)), 4);
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}
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_Jv_InterpException * exceptions ()
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{
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return (_Jv_InterpException*) (this+1);
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}
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static size_t size (int exc_count, int code_length)
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{
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return
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ROUND ((sizeof (_Jv_InterpMethod)
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+ (exc_count * sizeof (_Jv_InterpException))), 4)
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+ code_length;
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}
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// return the method's invocation pointer (a stub).
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void *ncode ();
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void compile (const void * const *);
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static void run_normal (ffi_cif*, void*, ffi_raw*, void*);
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static void run_synch_object (ffi_cif*, void*, ffi_raw*, void*);
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static void run_synch_class (ffi_cif*, void*, ffi_raw*, void*);
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void run (void*, ffi_raw *);
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public:
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static void dump_object(jobject o);
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friend class _Jv_ClassReader;
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friend class _Jv_BytecodeVerifier;
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friend class gnu::gcj::runtime::NameFinder;
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friend class gnu::gcj::runtime::StackTrace;
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friend void _Jv_PrepareClass(jclass);
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#ifdef JV_MARKOBJ_DECL
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friend JV_MARKOBJ_DECL;
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#endif
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};
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class _Jv_InterpClass : public java::lang::Class
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{
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_Jv_MethodBase **interpreted_methods;
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_Jv_ushort *field_initializers;
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friend class _Jv_ClassReader;
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friend class _Jv_InterpMethod;
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friend void _Jv_PrepareClass(jclass);
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friend void _Jv_InitField (jobject, jclass, int);
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#ifdef JV_MARKOBJ_DECL
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friend JV_MARKOBJ_DECL;
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#endif
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friend _Jv_MethodBase ** _Jv_GetFirstMethod (_Jv_InterpClass *klass);
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};
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extern inline _Jv_MethodBase **
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_Jv_GetFirstMethod (_Jv_InterpClass *klass)
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{
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return klass->interpreted_methods;
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}
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struct _Jv_ResolvedMethod {
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jint stack_item_count;
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jint vtable_index;
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jclass klass;
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_Jv_Method* method;
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// a resolved method holds the cif in-line, so that _Jv_MarkObj just needs
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// to mark the resolved method to hold on to the cif. Some memory could be
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// saved by keeping a cache of cif's, since many will be the same.
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ffi_cif cif;
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ffi_type * arg_types[0];
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};
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class _Jv_JNIMethod : public _Jv_MethodBase
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{
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// The underlying function. If NULL we have to look for the
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// function.
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void *function;
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// This is the CIF used by the JNI function.
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ffi_cif jni_cif;
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// These are the argument types used by the JNI function.
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ffi_type **jni_arg_types;
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// This function is used when making a JNI call from the interpreter.
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static void call (ffi_cif *, void *, ffi_raw *, void *);
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void *ncode ();
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friend class _Jv_ClassReader;
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friend void _Jv_PrepareClass(jclass);
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public:
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// FIXME: this is ugly.
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void set_function (void *f)
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{
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function = f;
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}
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};
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// A structure of this type is used to link together interpreter
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// invocations on the stack.
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struct _Jv_MethodChain
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{
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const _Jv_InterpMethod *self;
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_Jv_MethodChain **ptr;
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_Jv_MethodChain *next;
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_Jv_MethodChain (const _Jv_InterpMethod *s, _Jv_MethodChain **n)
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{
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self = s;
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ptr = n;
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next = *n;
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*n = this;
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}
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~_Jv_MethodChain ()
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{
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*ptr = next;
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}
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};
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#endif /* INTERPRETER */
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#endif /* __JAVA_INTERP_H__ */
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