1 // java-interp.h - Header file for the bytecode interpreter. -*- c++ -*-
3 /* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 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 <java/lang/Thread.h>
26 #include <gnu/gcj/RawData.h>
28 // Define this to get the direct-threaded interpreter. If undefined,
29 // we revert to a basic bytecode interpreter. The former is faster
30 // but uses more memory.
31 #define DIRECT_THREADED
35 struct _Jv_ResolvedMethod;
37 void _Jv_InitInterpreter ();
38 void _Jv_DefineClass (jclass, jbyteArray, jint, jint,
39 java::security::ProtectionDomain *,
42 void _Jv_InitField (jobject, jclass, int);
43 void * _Jv_AllocMethodInvocation (jsize size);
44 int _Jv_count_arguments (_Jv_Utf8Const *signature,
45 jboolean staticp = true);
46 void _Jv_VerifyMethod (_Jv_InterpMethod *method);
47 void _Jv_CompileMethod (_Jv_InterpMethod* method);
48 int _Jv_init_cif (_Jv_Utf8Const* signature,
55 /* the interpreter is written in C++, primarily because it makes it easy for
56 * the entire thing to be "friend" with class Class. */
58 class _Jv_InterpClass;
59 class _Jv_InterpMethod;
61 // Before a method is "compiled" we store values as the bytecode PC,
62 // an int. Afterwards we store them as pointers into the prepared
70 class _Jv_InterpException
72 _Jv_InterpPC start_pc;
74 _Jv_InterpPC handler_pc;
75 _Jv_InterpPC handler_type;
77 friend class _Jv_ClassReader;
78 friend class _Jv_InterpMethod;
79 friend class _Jv_BytecodeVerifier;
82 // Base class for method representations. Subclasses are interpreted
87 // The class which defined this method.
88 jclass defining_class;
90 // The method description.
93 // Size of raw arguments.
94 _Jv_ushort args_raw_size;
96 friend class _Jv_InterpreterEngine;
99 _Jv_Method *get_method ()
105 // The type of the PC depends on whether we're doing direct threading
106 // or a more ordinary bytecode interpreter.
107 #ifdef DIRECT_THREADED
108 // Slot in the "compiled" form of the bytecode.
113 // An integer value used by an instruction.
115 // A pointer value used by an instruction.
119 typedef insn_slot *pc_t;
121 typedef unsigned char *pc_t;
125 // This structure holds the bytecode pc and corresponding source code
126 // line number. An array (plus length field) of this structure is put
127 // in each _Jv_InterpMethod and used to resolve the (internal) program
128 // counter of the interpreted method to an actual java source file
130 struct _Jv_LineTableEntry
140 // This structure holds local variable information.
141 // The pc value is the first pc where the variable must have a value and it
142 // must continue to have a value until (start_pc + length).
143 // The name is the variable name, and the descriptor contains type information.
144 // The slot is the index in the local variable array of this method, long and
145 // double occupy slot and slot+1.
146 struct _Jv_LocalVarTableEntry
148 int bytecode_start_pc;
155 class _Jv_InterpMethod : public _Jv_MethodBase
157 // Breakpoint instruction
158 static pc_t breakpoint_insn;
159 #ifdef DIRECT_THREADED
160 static insn_slot bp_insn_slot;
162 static unsigned char bp_insn_opcode;
165 _Jv_ushort max_stack;
166 _Jv_ushort max_locals;
169 _Jv_ushort exc_count;
172 // Length of the line_table - when this is zero then line_table is NULL.
174 _Jv_LineTableEntry *line_table;
176 // The local variable table length and the table itself
177 int local_var_table_len;
178 _Jv_LocalVarTableEntry *local_var_table;
181 int number_insn_slots;
183 unsigned char* bytecode ()
186 ((unsigned char*)this)
187 + ROUND((sizeof (_Jv_InterpMethod)
188 + exc_count*sizeof (_Jv_InterpException)), 4);
191 _Jv_InterpException * exceptions ()
193 return (_Jv_InterpException*) (this+1);
196 static size_t size (int exc_count, int code_length)
199 ROUND ((sizeof (_Jv_InterpMethod)
200 + (exc_count * sizeof (_Jv_InterpException))), 4)
204 // return the method's invocation pointer (a stub).
206 void compile (const void * const *);
208 static void run_normal (ffi_cif*, void*, ffi_raw*, void*);
209 static void run_synch_object (ffi_cif*, void*, ffi_raw*, void*);
210 static void run_class (ffi_cif*, void*, ffi_raw*, void*);
211 static void run_synch_class (ffi_cif*, void*, ffi_raw*, void*);
213 static void run_normal_debug (ffi_cif*, void*, ffi_raw*, void*);
214 static void run_synch_object_debug (ffi_cif*, void*, ffi_raw*, void*);
215 static void run_class_debug (ffi_cif*, void*, ffi_raw*, void*);
216 static void run_synch_class_debug (ffi_cif*, void*, ffi_raw*, void*);
218 static void run (void *, ffi_raw *, _Jv_InterpMethod *);
219 static void run_debug (void *, ffi_raw *, _Jv_InterpMethod *);
223 // Returns source file line number for given PC value, or -1 if line
224 // number info is unavailable.
225 int get_source_line(pc_t mpc);
229 // Convenience function for indexing bytecode PC/insn slots in
230 // line tables for JDWP
231 jlong insn_index (pc_t pc);
233 // Helper function used to check if there is a handler for an exception
234 // present at this code index
235 jboolean check_handler (pc_t *pc, _Jv_InterpMethod *meth,
236 java::lang::Throwable *ex);
238 /* Get the line table for this method.
239 * start is the lowest index in the method
240 * end is the highest index in the method
241 * line_numbers is an array to hold the list of source line numbers
242 * code_indices is an array to hold the corresponding list of code indices
244 void get_line_table (jlong& start, jlong& end, jintArray& line_numbers,
245 jlongArray& code_indices);
247 int get_max_locals ()
249 return static_cast<int> (max_locals);
252 /* Get info for a local variable of this method.
253 * If there is no loca_var_table for this method it will return -1.
254 * table_slot indicates which slot in the local_var_table to get, if there is
255 * no variable at this location it will return 0.
256 * Otherwise, it will return the number of table slots after the selected
257 * slot, indexed from 0.
259 * Example: there are 5 slots in the table, you request slot 0 so it will
262 int get_local_var_table (char **name, char **sig, char **generic_sig,
263 jlong *startloc, jint *length, jint *slot,
266 /* Installs a break instruction at the given code index. Returns
267 the pc_t of the breakpoint or NULL if index is invalid. */
268 pc_t install_break (jlong index);
270 // Gets the instruction at the given index
271 pc_t get_insn (jlong index);
273 /* Writes the given instruction at the given code index. Returns
274 the insn or NULL if index is invalid. */
275 pc_t set_insn (jlong index, pc_t insn);
277 #ifdef DIRECT_THREADED
278 friend void _Jv_CompileMethod (_Jv_InterpMethod*);
281 friend class _Jv_ClassReader;
282 friend class _Jv_BytecodeVerifier;
283 friend class _Jv_StackTrace;
284 friend class _Jv_InterpreterEngine;
286 #ifdef JV_MARKOBJ_DECL
287 friend JV_MARKOBJ_DECL;
291 class _Jv_InterpClass
293 _Jv_MethodBase **interpreted_methods;
294 _Jv_ushort *field_initializers;
295 jstring source_file_name;
297 friend class _Jv_ClassReader;
298 friend class _Jv_InterpMethod;
299 friend class _Jv_StackTrace;
300 friend class _Jv_InterpreterEngine;
302 friend void _Jv_InitField (jobject, jclass, int);
303 #ifdef JV_MARKOBJ_DECL
304 friend JV_MARKOBJ_DECL;
307 friend _Jv_MethodBase ** _Jv_GetFirstMethod (_Jv_InterpClass *klass);
310 extern inline _Jv_MethodBase **
311 _Jv_GetFirstMethod (_Jv_InterpClass *klass)
313 return klass->interpreted_methods;
316 struct _Jv_ResolvedMethod
318 jint stack_item_count;
322 // a resolved method holds the cif in-line, so that _Jv_MarkObj just needs
323 // to mark the resolved method to hold on to the cif. Some memory could be
324 // saved by keeping a cache of cif's, since many will be the same.
326 ffi_type * arg_types[0];
329 class _Jv_JNIMethod : public _Jv_MethodBase
331 // The underlying function. If NULL we have to look for the
335 // This is the CIF used by the JNI function.
338 // These are the argument types used by the JNI function.
339 ffi_type **jni_arg_types;
341 // This function is used when making a JNI call from the interpreter.
342 static void call (ffi_cif *, void *, ffi_raw *, void *);
346 friend class _Jv_ClassReader;
347 friend class _Jv_InterpreterEngine;
349 #ifdef JV_MARKOBJ_DECL
350 friend JV_MARKOBJ_DECL;
354 // FIXME: this is ugly.
355 void set_function (void *f)
368 // The composite call stack as represented by a linked list of frames
372 java::lang::Thread *thread;
376 _Jv_MethodBase *self;
378 _Jv_Method *proxyMethod;
381 //The full list of frames, JNI and interpreted
383 _Jv_FrameType frame_type;
385 _Jv_Frame (_Jv_MethodBase *s, java::lang::Thread *thr, _Jv_FrameType type)
389 next = (_Jv_Frame *) thr->frame;
390 thr->frame = (gnu::gcj::RawData *) this;
396 thread->frame = (gnu::gcj::RawData *) next;
403 for (f = this; f != NULL; f = f->next)
410 // An interpreted frame in the call stack
411 class _Jv_InterpFrame : public _Jv_Frame
415 // Keep the purely interpreted list around so as not to break backtraces
416 _Jv_InterpFrame *next_interp;
424 //Debug info for local variables.
428 // Object pointer for this frame ("this")
431 _Jv_InterpFrame (void *meth, java::lang::Thread *thr, jclass proxyCls = NULL)
432 : _Jv_Frame (reinterpret_cast<_Jv_MethodBase *> (meth), thr,
435 next_interp = (_Jv_InterpFrame *) thr->interp_frame;
436 proxyClass = proxyCls;
437 thr->interp_frame = (gnu::gcj::RawData *) this;
443 thread->interp_frame = (gnu::gcj::RawData *) next_interp;
446 jobject get_this_ptr ()
452 // A native frame in the call stack really just a placeholder
453 class _Jv_NativeFrame : public _Jv_Frame
457 _Jv_NativeFrame (_Jv_JNIMethod *s, java::lang::Thread *thr)
458 : _Jv_Frame (s, thr, frame_native)
463 #endif /* INTERPRETER */
465 #endif /* __JAVA_INTERP_H__ */