| // java-interp.h - Header file for the bytecode interpreter. -*- c++ -*- |
| |
| /* Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation |
| |
| This file is part of libgcj. |
| |
| This software is copyrighted work licensed under the terms of the |
| Libgcj License. Please consult the file "LIBGCJ_LICENSE" for |
| details. */ |
| |
| #ifndef __JAVA_INTERP_H__ |
| #define __JAVA_INTERP_H__ |
| |
| #include <jvm.h> |
| #include <java-cpool.h> |
| #include <gnu/gcj/runtime/NameFinder.h> |
| |
| #ifdef INTERPRETER |
| |
| #pragma interface |
| |
| #include <java/lang/Class.h> |
| #include <java/lang/ClassLoader.h> |
| #include <java/lang/reflect/Modifier.h> |
| #include <gnu/gcj/runtime/StackTrace.h> |
| |
| extern "C" { |
| #include <ffi.h> |
| } |
| |
| extern inline jboolean |
| _Jv_IsInterpretedClass (jclass c) |
| { |
| return (c->accflags & java::lang::reflect::Modifier::INTERPRETED) != 0; |
| } |
| |
| struct _Jv_ResolvedMethod; |
| |
| void _Jv_InitInterpreter (); |
| void _Jv_DefineClass (jclass, jbyteArray, jint, jint); |
| |
| void _Jv_InitField (jobject, jclass, int); |
| void * _Jv_AllocMethodInvocation (jsize size); |
| int _Jv_count_arguments (_Jv_Utf8Const *signature, |
| jboolean staticp = true); |
| void _Jv_VerifyMethod (_Jv_InterpMethod *method); |
| |
| /* FIXME: this should really be defined in some more generic place */ |
| #define ROUND(V, A) (((((unsigned) (V))-1) | ((A)-1))+1) |
| |
| /* the interpreter is written in C++, primarily because it makes it easy for |
| * the entire thing to be "friend" with class Class. */ |
| |
| class _Jv_InterpClass; |
| class _Jv_InterpMethod; |
| |
| // Before a method is "compiled" we store values as the bytecode PC, |
| // an int. Afterwards we store them as pointers into the prepared |
| // code itself. |
| union _Jv_InterpPC |
| { |
| int i; |
| void *p; |
| }; |
| |
| class _Jv_InterpException |
| { |
| _Jv_InterpPC start_pc; |
| _Jv_InterpPC end_pc; |
| _Jv_InterpPC handler_pc; |
| _Jv_InterpPC handler_type; |
| |
| friend class _Jv_ClassReader; |
| friend class _Jv_InterpMethod; |
| friend class _Jv_BytecodeVerifier; |
| }; |
| |
| // Base class for method representations. Subclasses are interpreted |
| // and JNI methods. |
| class _Jv_MethodBase |
| { |
| protected: |
| // The class which defined this method. |
| _Jv_InterpClass *defining_class; |
| |
| // The method description. |
| _Jv_Method *self; |
| |
| // Size of raw arguments. |
| _Jv_ushort args_raw_size; |
| |
| // Chain of addresses to fill in. See _Jv_Defer_Resolution. |
| void *deferred; |
| |
| friend void _Jv_Defer_Resolution (void *cl, _Jv_Method *meth, void **); |
| friend void _Jv_PrepareClass(jclass); |
| |
| public: |
| _Jv_Method *get_method () |
| { |
| return self; |
| } |
| }; |
| |
| class _Jv_InterpMethod : public _Jv_MethodBase |
| { |
| _Jv_ushort max_stack; |
| _Jv_ushort max_locals; |
| int code_length; |
| |
| _Jv_ushort exc_count; |
| |
| void *prepared; |
| |
| unsigned char* bytecode () |
| { |
| return |
| ((unsigned char*)this) |
| + ROUND((sizeof (_Jv_InterpMethod) |
| + exc_count*sizeof (_Jv_InterpException)), 4); |
| } |
| |
| _Jv_InterpException * exceptions () |
| { |
| return (_Jv_InterpException*) (this+1); |
| } |
| |
| static size_t size (int exc_count, int code_length) |
| { |
| return |
| ROUND ((sizeof (_Jv_InterpMethod) |
| + (exc_count * sizeof (_Jv_InterpException))), 4) |
| + code_length; |
| } |
| |
| // return the method's invocation pointer (a stub). |
| void *ncode (); |
| void compile (const void * const *); |
| |
| static void run_normal (ffi_cif*, void*, ffi_raw*, void*); |
| static void run_synch_object (ffi_cif*, void*, ffi_raw*, void*); |
| static void run_class (ffi_cif*, void*, ffi_raw*, void*); |
| static void run_synch_class (ffi_cif*, void*, ffi_raw*, void*); |
| |
| void run (void*, ffi_raw *); |
| |
| public: |
| static void dump_object(jobject o); |
| |
| friend class _Jv_ClassReader; |
| friend class _Jv_BytecodeVerifier; |
| friend class gnu::gcj::runtime::NameFinder; |
| friend class gnu::gcj::runtime::StackTrace; |
| |
| friend void _Jv_PrepareClass(jclass); |
| |
| #ifdef JV_MARKOBJ_DECL |
| friend JV_MARKOBJ_DECL; |
| #endif |
| }; |
| |
| class _Jv_InterpClass : public java::lang::Class |
| { |
| _Jv_MethodBase **interpreted_methods; |
| _Jv_ushort *field_initializers; |
| |
| friend class _Jv_ClassReader; |
| friend class _Jv_InterpMethod; |
| friend void _Jv_PrepareClass(jclass); |
| friend void _Jv_PrepareMissingMethods (jclass base2, jclass iface_class); |
| friend void _Jv_InitField (jobject, jclass, int); |
| #ifdef JV_MARKOBJ_DECL |
| friend JV_MARKOBJ_DECL; |
| #endif |
| |
| friend _Jv_MethodBase ** _Jv_GetFirstMethod (_Jv_InterpClass *klass); |
| friend void _Jv_Defer_Resolution (void *cl, _Jv_Method *meth, void **); |
| }; |
| |
| // We have an interpreted class CL and we're trying to find the |
| // address of the ncode of a method METH. That interpreted class |
| // hasn't yet been prepared, so we defer fixups until they are ready. |
| // To do this, we create a chain of fixups that will be resolved by |
| // _Jv_PrepareClass. |
| extern inline void |
| _Jv_Defer_Resolution (void *cl, _Jv_Method *meth, void **address) |
| { |
| int i; |
| _Jv_InterpClass *self = (_Jv_InterpClass *)cl; |
| for (i = 0; i < self->method_count; i++) |
| { |
| _Jv_Method *m = &self->methods[i]; |
| if (m == meth) |
| { |
| _Jv_MethodBase *imeth = self->interpreted_methods[i]; |
| *address = imeth->deferred; |
| imeth->deferred = address; |
| return; |
| } |
| } |
| return; |
| } |
| |
| extern inline _Jv_MethodBase ** |
| _Jv_GetFirstMethod (_Jv_InterpClass *klass) |
| { |
| return klass->interpreted_methods; |
| } |
| |
| struct _Jv_ResolvedMethod { |
| jint stack_item_count; |
| jint vtable_index; |
| jclass klass; |
| _Jv_Method* method; |
| |
| // a resolved method holds the cif in-line, so that _Jv_MarkObj just needs |
| // to mark the resolved method to hold on to the cif. Some memory could be |
| // saved by keeping a cache of cif's, since many will be the same. |
| ffi_cif cif; |
| ffi_type * arg_types[0]; |
| }; |
| |
| class _Jv_JNIMethod : public _Jv_MethodBase |
| { |
| // The underlying function. If NULL we have to look for the |
| // function. |
| void *function; |
| |
| // This is the CIF used by the JNI function. |
| ffi_cif jni_cif; |
| |
| // These are the argument types used by the JNI function. |
| ffi_type **jni_arg_types; |
| |
| // This function is used when making a JNI call from the interpreter. |
| static void call (ffi_cif *, void *, ffi_raw *, void *); |
| |
| void *ncode (); |
| |
| friend class _Jv_ClassReader; |
| friend void _Jv_PrepareClass(jclass); |
| |
| public: |
| // FIXME: this is ugly. |
| void set_function (void *f) |
| { |
| function = f; |
| } |
| }; |
| |
| // A structure of this type is used to link together interpreter |
| // invocations on the stack. |
| struct _Jv_MethodChain |
| { |
| const _Jv_InterpMethod *self; |
| _Jv_MethodChain **ptr; |
| _Jv_MethodChain *next; |
| |
| _Jv_MethodChain (const _Jv_InterpMethod *s, _Jv_MethodChain **n) |
| { |
| self = s; |
| ptr = n; |
| next = *n; |
| *n = this; |
| } |
| |
| ~_Jv_MethodChain () |
| { |
| *ptr = next; |
| } |
| }; |
| |
| #endif /* INTERPRETER */ |
| |
| #endif /* __JAVA_INTERP_H__ */ |