1 // interpret.cc - Code for the interpreter
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 /* Author: Kresten Krab Thorup <krab@gnu.org> */
16 #pragma implementation "java-interp.h"
19 #include <java-cpool.h>
20 #include <java-interp.h>
21 #include <java/lang/System.h>
22 #include <java/lang/String.h>
23 #include <java/lang/Integer.h>
24 #include <java/lang/Long.h>
25 #include <java/lang/StringBuffer.h>
26 #include <java/lang/Class.h>
27 #include <java/lang/reflect/Modifier.h>
28 #include <java/lang/InternalError.h>
29 #include <java/lang/NullPointerException.h>
30 #include <java/lang/ArithmeticException.h>
31 #include <java/lang/IncompatibleClassChangeError.h>
32 #include <java/lang/InstantiationException.h>
33 #include <java/lang/Thread.h>
34 #include <java-insns.h>
35 #include <java-signal.h>
36 #include <java/lang/ClassFormatError.h>
37 #include <execution.h>
38 #include <java/lang/reflect/Modifier.h>
41 #include "jvmti-int.h"
43 #include <gnu/classpath/jdwp/Jdwp.h>
44 #include <gnu/gcj/jvmti/Breakpoint.h>
45 #include <gnu/gcj/jvmti/BreakpointManager.h>
49 // Execution engine for interpreted code.
50 _Jv_InterpreterEngine _Jv_soleInterpreterEngine
;
56 static void throw_internal_error (const char *msg
)
57 __attribute__ ((__noreturn__
));
58 static void throw_incompatible_class_change_error (jstring msg
)
59 __attribute__ ((__noreturn__
));
60 static void throw_null_pointer_exception ()
61 __attribute__ ((__noreturn__
));
63 static void throw_class_format_error (jstring msg
)
64 __attribute__ ((__noreturn__
));
65 static void throw_class_format_error (const char *msg
)
66 __attribute__ ((__noreturn__
));
68 #ifdef DIRECT_THREADED
69 // Lock to ensure that methods are not compiled concurrently.
70 // We could use a finer-grained lock here, however it is not safe to use
71 // the Class monitor as user code in another thread could hold it.
72 static _Jv_Mutex_t compile_mutex
;
77 _Jv_MutexInit (&compile_mutex
);
80 void _Jv_InitInterpreter() {}
83 // The breakpoint instruction. For the direct threaded case,
84 // _Jv_InterpMethod::compile will initialize breakpoint_insn
85 // the first time it is called.
86 #ifdef DIRECT_THREADED
87 insn_slot
_Jv_InterpMethod::bp_insn_slot
;
88 pc_t
_Jv_InterpMethod::breakpoint_insn
= NULL
;
90 unsigned char _Jv_InterpMethod::bp_insn_opcode
91 = static_cast<unsigned char> (op_breakpoint
);
92 pc_t
_Jv_InterpMethod::breakpoint_insn
= &_Jv_InterpMethod::bp_insn_opcode
;
95 extern "C" double __ieee754_fmod (double,double);
97 static inline void dupx (_Jv_word
*sp
, int n
, int x
)
99 // first "slide" n+x elements n to the right
101 for (int i
= 0; i
< n
+x
; i
++)
103 sp
[(top
-i
)] = sp
[(top
-i
)-n
];
106 // next, copy the n top elements, n+x down
107 for (int i
= 0; i
< n
; i
++)
109 sp
[top
-(n
+x
)-i
] = sp
[top
-i
];
113 // Used to convert from floating types to integral types.
114 template<typename TO
, typename FROM
>
116 convert (FROM val
, TO min
, TO max
)
119 if (val
>= (FROM
) max
)
121 else if (val
<= (FROM
) min
)
130 #define PUSHA(V) (sp++)->o = (V)
131 #define PUSHI(V) (sp++)->i = (V)
132 #define PUSHF(V) (sp++)->f = (V)
133 #if SIZEOF_VOID_P == 8
134 # define PUSHL(V) (sp->l = (V), sp += 2)
135 # define PUSHD(V) (sp->d = (V), sp += 2)
137 # define PUSHL(V) do { _Jv_word2 w2; w2.l=(V); \
138 (sp++)->ia[0] = w2.ia[0]; \
139 (sp++)->ia[0] = w2.ia[1]; } while (0)
140 # define PUSHD(V) do { _Jv_word2 w2; w2.d=(V); \
141 (sp++)->ia[0] = w2.ia[0]; \
142 (sp++)->ia[0] = w2.ia[1]; } while (0)
145 #define POPA() ((--sp)->o)
146 #define POPI() ((jint) (--sp)->i) // cast since it may be promoted
147 #define POPF() ((jfloat) (--sp)->f)
148 #if SIZEOF_VOID_P == 8
149 # define POPL() (sp -= 2, (jlong) sp->l)
150 # define POPD() (sp -= 2, (jdouble) sp->d)
152 # define POPL() ({ _Jv_word2 w2; \
153 w2.ia[1] = (--sp)->ia[0]; \
154 w2.ia[0] = (--sp)->ia[0]; w2.l; })
155 # define POPD() ({ _Jv_word2 w2; \
156 w2.ia[1] = (--sp)->ia[0]; \
157 w2.ia[0] = (--sp)->ia[0]; w2.d; })
160 #define LOADA(I) (sp++)->o = locals[I].o
161 #define LOADI(I) (sp++)->i = locals[I].i
162 #define LOADF(I) (sp++)->f = locals[I].f
163 #if SIZEOF_VOID_P == 8
164 # define LOADL(I) (sp->l = locals[I].l, sp += 2)
165 # define LOADD(I) (sp->d = locals[I].d, sp += 2)
167 # define LOADL(I) do { jint __idx = (I); \
168 (sp++)->ia[0] = locals[__idx].ia[0]; \
169 (sp++)->ia[0] = locals[__idx+1].ia[0]; \
171 # define LOADD(I) LOADL(I)
176 DEBUG_LOCALS_INSN (I, 'o'); \
177 locals[I].o = (--sp)->o; \
181 DEBUG_LOCALS_INSN (I, 'i'); \
182 locals[I].i = (--sp)->i; \
186 DEBUG_LOCALS_INSN (I, 'f'); \
187 locals[I].f = (--sp)->f; \
189 #if SIZEOF_VOID_P == 8
192 DEBUG_LOCALS_INSN (I, 'l'); \
193 (sp -= 2, locals[I].l = sp->l); \
197 DEBUG_LOCALS_INSN (I, 'd'); \
198 (sp -= 2, locals[I].d = sp->d); \
204 DEBUG_LOCALS_INSN (I, 'l'); \
206 locals[__idx+1].ia[0] = (--sp)->ia[0]; \
207 locals[__idx].ia[0] = (--sp)->ia[0]; \
211 DEBUG_LOCALS_INSN(I, 'd'); \
213 locals[__idx+1].ia[0] = (--sp)->ia[0]; \
214 locals[__idx].ia[0] = (--sp)->ia[0]; \
218 #define PEEKI(I) (locals+(I))->i
219 #define PEEKA(I) (locals+(I))->o
222 DEBUG_LOCALS_INSN(I,'i'); \
223 ((locals+(I))->i = (V))
226 #define BINOPI(OP) { \
227 jint value2 = POPI(); \
228 jint value1 = POPI(); \
229 PUSHI(value1 OP value2); \
232 #define BINOPF(OP) { \
233 jfloat value2 = POPF(); \
234 jfloat value1 = POPF(); \
235 PUSHF(value1 OP value2); \
238 #define BINOPL(OP) { \
239 jlong value2 = POPL(); \
240 jlong value1 = POPL(); \
241 PUSHL(value1 OP value2); \
244 #define BINOPD(OP) { \
245 jdouble value2 = POPD(); \
246 jdouble value1 = POPD(); \
247 PUSHD(value1 OP value2); \
251 get1s (unsigned char* loc
)
253 return *(signed char*)loc
;
257 get1u (unsigned char* loc
)
263 get2s(unsigned char* loc
)
265 return (((jint
)*(signed char*)loc
) << 8) | ((jint
)*(loc
+1));
269 get2u (unsigned char* loc
)
271 return (((jint
)(*loc
)) << 8) | ((jint
)*(loc
+1));
275 get4 (unsigned char* loc
)
277 return (((jint
)(loc
[0])) << 24)
278 | (((jint
)(loc
[1])) << 16)
279 | (((jint
)(loc
[2])) << 8)
280 | (((jint
)(loc
[3])) << 0);
283 #define SAVE_PC() frame_desc.pc = pc
285 // We used to define this conditionally, depending on HANDLE_SEGV.
286 // However, that runs into a problem if a chunk in low memory is
287 // mapped and we try to look at a field near the end of a large
288 // object. See PR 26858 for details. It is, most likely, relatively
289 // inexpensive to simply do this check always.
290 #define NULLCHECK(X) \
291 do { SAVE_PC(); if ((X)==NULL) throw_null_pointer_exception (); } while (0)
293 // Note that we can still conditionally define NULLARRAYCHECK, since
294 // we know that all uses of an array will first reference the length
295 // field, which is first -- and thus will trigger a SEGV.
297 #define NULLARRAYCHECK(X) SAVE_PC()
299 #define NULLARRAYCHECK(X) \
303 if ((X) == NULL) { throw_null_pointer_exception (); } \
307 #define ARRAYBOUNDSCHECK(array, index) \
310 if (((unsigned) index) >= (unsigned) (array->length)) \
311 _Jv_ThrowBadArrayIndex (index); \
315 _Jv_InterpMethod::run_normal (ffi_cif
*,
320 _Jv_InterpMethod
*_this
= (_Jv_InterpMethod
*) __this
;
321 run (ret
, args
, _this
);
325 _Jv_InterpMethod::run_normal_debug (ffi_cif
*,
330 _Jv_InterpMethod
*_this
= (_Jv_InterpMethod
*) __this
;
331 run_debug (ret
, args
, _this
);
335 _Jv_InterpMethod::run_synch_object (ffi_cif
*,
340 _Jv_InterpMethod
*_this
= (_Jv_InterpMethod
*) __this
;
342 jobject rcv
= (jobject
) args
[0].ptr
;
343 JvSynchronize
mutex (rcv
);
345 run (ret
, args
, _this
);
349 _Jv_InterpMethod::run_synch_object_debug (ffi_cif
*,
354 _Jv_InterpMethod
*_this
= (_Jv_InterpMethod
*) __this
;
356 jobject rcv
= (jobject
) args
[0].ptr
;
357 JvSynchronize
mutex (rcv
);
359 run_debug (ret
, args
, _this
);
363 _Jv_InterpMethod::run_class (ffi_cif
*,
368 _Jv_InterpMethod
*_this
= (_Jv_InterpMethod
*) __this
;
369 _Jv_InitClass (_this
->defining_class
);
370 run (ret
, args
, _this
);
374 _Jv_InterpMethod::run_class_debug (ffi_cif
*,
379 _Jv_InterpMethod
*_this
= (_Jv_InterpMethod
*) __this
;
380 _Jv_InitClass (_this
->defining_class
);
381 run_debug (ret
, args
, _this
);
385 _Jv_InterpMethod::run_synch_class (ffi_cif
*,
390 _Jv_InterpMethod
*_this
= (_Jv_InterpMethod
*) __this
;
392 jclass sync
= _this
->defining_class
;
393 _Jv_InitClass (sync
);
394 JvSynchronize
mutex (sync
);
396 run (ret
, args
, _this
);
400 _Jv_InterpMethod::run_synch_class_debug (ffi_cif
*,
405 _Jv_InterpMethod
*_this
= (_Jv_InterpMethod
*) __this
;
407 jclass sync
= _this
->defining_class
;
408 _Jv_InitClass (sync
);
409 JvSynchronize
mutex (sync
);
411 run_debug (ret
, args
, _this
);
414 #ifdef DIRECT_THREADED
415 // "Compile" a method by turning it from bytecode to direct-threaded
418 _Jv_InterpMethod::compile (const void * const *insn_targets
)
420 insn_slot
*insns
= NULL
;
422 unsigned char *codestart
= bytecode ();
423 unsigned char *end
= codestart
+ code_length
;
424 _Jv_word
*pool_data
= defining_class
->constants
.data
;
426 #define SET_ONE(Field, Value) \
432 insns[next++].Field = Value; \
436 #define SET_INSN(Value) SET_ONE (insn, (void *) Value)
437 #define SET_INT(Value) SET_ONE (int_val, Value)
438 #define SET_DATUM(Value) SET_ONE (datum, Value)
440 // Map from bytecode PC to slot in INSNS.
441 int *pc_mapping
= (int *) __builtin_alloca (sizeof (int) * code_length
);
442 for (int i
= 0; i
< code_length
; ++i
)
445 for (int i
= 0; i
< 2; ++i
)
447 jboolean first_pass
= i
== 0;
451 insns
= (insn_slot
*) _Jv_AllocBytes (sizeof (insn_slot
) * next
);
452 number_insn_slots
= next
;
456 unsigned char *pc
= codestart
;
459 int base_pc_val
= pc
- codestart
;
461 pc_mapping
[base_pc_val
] = next
;
463 java_opcode opcode
= (java_opcode
) *pc
++;
465 if (opcode
== op_nop
)
467 SET_INSN (insn_targets
[opcode
]);
608 case op_monitorenter
:
618 // No argument, nothing else to do.
622 SET_INT (get1s (pc
));
628 int index
= get1u (pc
);
630 // For an unresolved class we want to delay resolution
632 if (defining_class
->constants
.tags
[index
] == JV_CONSTANT_Class
)
635 SET_INSN (insn_targets
[int (op_jsr_w
) + 1]);
639 SET_DATUM (pool_data
[index
].o
);
655 SET_INT (get1u (pc
));
660 SET_INT (get1u (pc
));
661 SET_INT (get1s (pc
+ 1));
667 int index
= get2u (pc
);
669 // For an unresolved class we want to delay resolution
671 if (defining_class
->constants
.tags
[index
] == JV_CONSTANT_Class
)
674 SET_INSN (insn_targets
[int (op_jsr_w
) + 1]);
678 SET_DATUM (pool_data
[index
].o
);
684 int index
= get2u (pc
);
686 SET_DATUM (&pool_data
[index
]);
691 SET_INT (get2s (pc
));
703 case op_invokespecial
:
704 case op_invokestatic
:
705 case op_invokevirtual
:
706 SET_INT (get2u (pc
));
710 case op_multianewarray
:
711 SET_INT (get2u (pc
));
712 SET_INT (get1u (pc
+ 2));
735 int offset
= get2s (pc
);
738 int new_pc
= base_pc_val
+ offset
;
740 bool orig_was_goto
= opcode
== op_goto
;
742 // Thread jumps. We limit the loop count; this lets
743 // us avoid infinite loops if the bytecode contains
744 // such. `10' is arbitrary.
746 while (codestart
[new_pc
] == op_goto
&& count
-- > 0)
747 new_pc
+= get2s (&codestart
[new_pc
+ 1]);
749 // If the jump takes us to a `return' instruction and
750 // the original branch was an unconditional goto, then
751 // we hoist the return.
752 opcode
= (java_opcode
) codestart
[new_pc
];
754 && (opcode
== op_ireturn
|| opcode
== op_lreturn
755 || opcode
== op_freturn
|| opcode
== op_dreturn
756 || opcode
== op_areturn
|| opcode
== op_return
))
759 SET_INSN (insn_targets
[opcode
]);
762 SET_DATUM (&insns
[pc_mapping
[new_pc
]]);
768 while ((pc
- codestart
) % 4 != 0)
771 jint def
= get4 (pc
);
772 SET_DATUM (&insns
[pc_mapping
[base_pc_val
+ def
]]);
778 int high
= get4 (pc
);
782 for (int i
= low
; i
<= high
; ++i
)
784 SET_DATUM (&insns
[pc_mapping
[base_pc_val
+ get4 (pc
)]]);
790 case op_lookupswitch
:
792 while ((pc
- codestart
) % 4 != 0)
795 jint def
= get4 (pc
);
796 SET_DATUM (&insns
[pc_mapping
[base_pc_val
+ def
]]);
799 jint npairs
= get4 (pc
);
805 jint match
= get4 (pc
);
806 jint offset
= get4 (pc
+ 4);
808 SET_DATUM (&insns
[pc_mapping
[base_pc_val
+ offset
]]);
814 case op_invokeinterface
:
816 jint index
= get2u (pc
);
818 // We ignore the next two bytes.
826 opcode
= (java_opcode
) get1u (pc
);
828 jint val
= get2u (pc
);
831 // We implement narrow and wide instructions using the
832 // same code in the interpreter. So we rewrite the
833 // instruction slot here.
835 insns
[next
- 1].insn
= (void *) insn_targets
[opcode
];
838 if (opcode
== op_iinc
)
840 SET_INT (get2s (pc
));
849 jint offset
= get4 (pc
);
851 SET_DATUM (&insns
[pc_mapping
[base_pc_val
+ offset
]]);
855 // Some "can't happen" cases that we include for
856 // error-checking purposes.
874 case op_getstatic_2s
:
875 case op_getstatic_2u
:
887 // Now update exceptions.
888 _Jv_InterpException
*exc
= exceptions ();
889 for (int i
= 0; i
< exc_count
; ++i
)
891 exc
[i
].start_pc
.p
= &insns
[pc_mapping
[exc
[i
].start_pc
.i
]];
892 exc
[i
].end_pc
.p
= &insns
[pc_mapping
[exc
[i
].end_pc
.i
]];
893 exc
[i
].handler_pc
.p
= &insns
[pc_mapping
[exc
[i
].handler_pc
.i
]];
894 // FIXME: resolve_pool_entry can throw - we shouldn't be doing this
895 // during compilation.
897 = (_Jv_Linker::resolve_pool_entry (defining_class
,
898 exc
[i
].handler_type
.i
)).clazz
;
899 exc
[i
].handler_type
.p
= handler
;
902 // Translate entries in the LineNumberTable from bytecode PC's to direct
903 // threaded interpreter instruction values.
904 for (int i
= 0; i
< line_table_len
; i
++)
906 int byte_pc
= line_table
[i
].bytecode_pc
;
907 // It isn't worth throwing an exception if this table is
908 // corrupted, but at the same time we don't want a crash.
909 if (byte_pc
< 0 || byte_pc
>= code_length
)
911 line_table
[i
].pc
= &insns
[pc_mapping
[byte_pc
]];
916 if (breakpoint_insn
== NULL
)
918 bp_insn_slot
.insn
= const_cast<void *> (insn_targets
[op_breakpoint
]);
919 breakpoint_insn
= &bp_insn_slot
;
922 #endif /* DIRECT_THREADED */
924 /* Run the given method.
925 When args is NULL, don't run anything -- just compile it. */
927 _Jv_InterpMethod::run (void *retp
, ffi_raw
*args
, _Jv_InterpMethod
*meth
)
930 #undef DEBUG_LOCALS_INSN
931 #define DEBUG_LOCALS_INSN(s, t) do {} while(0)
933 #include "interpret-run.cc"
937 _Jv_InterpMethod::run_debug (void *retp
, ffi_raw
*args
, _Jv_InterpMethod
*meth
)
940 #undef DEBUG_LOCALS_INSN
941 #define DEBUG_LOCALS_INSN(s, t) do {} while(0)
943 #include "interpret-run.cc"
947 throw_internal_error (const char *msg
)
949 throw new java::lang::InternalError (JvNewStringLatin1 (msg
));
953 throw_incompatible_class_change_error (jstring msg
)
955 throw new java::lang::IncompatibleClassChangeError (msg
);
959 throw_null_pointer_exception ()
961 throw new java::lang::NullPointerException
;
964 /* Look up source code line number for given bytecode (or direct threaded
967 _Jv_InterpMethod::get_source_line(pc_t mpc
)
969 int line
= line_table_len
> 0 ? line_table
[0].line
: -1;
970 for (int i
= 1; i
< line_table_len
; i
++)
971 if (line_table
[i
].pc
> mpc
)
974 line
= line_table
[i
].line
;
979 /** Do static initialization for fields with a constant initializer */
981 _Jv_InitField (jobject obj
, jclass klass
, int index
)
983 using namespace java::lang::reflect
;
985 if (obj
!= 0 && klass
== 0)
986 klass
= obj
->getClass ();
988 if (!_Jv_IsInterpretedClass (klass
))
991 _Jv_InterpClass
*iclass
= (_Jv_InterpClass
*)klass
->aux_info
;
993 _Jv_Field
* field
= (&klass
->fields
[0]) + index
;
995 if (index
> klass
->field_count
)
996 throw_internal_error ("field out of range");
998 int init
= iclass
->field_initializers
[index
];
1002 _Jv_Constants
*pool
= &klass
->constants
;
1003 int tag
= pool
->tags
[init
];
1005 if (! field
->isResolved ())
1006 throw_internal_error ("initializing unresolved field");
1008 if (obj
==0 && ((field
->flags
& Modifier::STATIC
) == 0))
1009 throw_internal_error ("initializing non-static field with no object");
1013 if ((field
->flags
& Modifier::STATIC
) != 0)
1014 addr
= (void*) field
->u
.addr
;
1016 addr
= (void*) (((char*)obj
) + field
->u
.boffset
);
1020 case JV_CONSTANT_String
:
1023 str
= _Jv_NewStringUtf8Const (pool
->data
[init
].utf8
);
1024 pool
->data
[init
].string
= str
;
1025 pool
->tags
[init
] = JV_CONSTANT_ResolvedString
;
1029 case JV_CONSTANT_ResolvedString
:
1030 if (! (field
->type
== &java::lang::String::class$
1031 || field
->type
== &java::lang::Class::class$
))
1032 throw_class_format_error ("string initialiser to non-string field");
1034 *(jstring
*)addr
= pool
->data
[init
].string
;
1037 case JV_CONSTANT_Integer
:
1039 int value
= pool
->data
[init
].i
;
1041 if (field
->type
== JvPrimClass (boolean
))
1042 *(jboolean
*)addr
= (jboolean
)value
;
1044 else if (field
->type
== JvPrimClass (byte
))
1045 *(jbyte
*)addr
= (jbyte
)value
;
1047 else if (field
->type
== JvPrimClass (char))
1048 *(jchar
*)addr
= (jchar
)value
;
1050 else if (field
->type
== JvPrimClass (short))
1051 *(jshort
*)addr
= (jshort
)value
;
1053 else if (field
->type
== JvPrimClass (int))
1054 *(jint
*)addr
= (jint
)value
;
1057 throw_class_format_error ("erroneous field initializer");
1061 case JV_CONSTANT_Long
:
1062 if (field
->type
!= JvPrimClass (long))
1063 throw_class_format_error ("erroneous field initializer");
1065 *(jlong
*)addr
= _Jv_loadLong (&pool
->data
[init
]);
1068 case JV_CONSTANT_Float
:
1069 if (field
->type
!= JvPrimClass (float))
1070 throw_class_format_error ("erroneous field initializer");
1072 *(jfloat
*)addr
= pool
->data
[init
].f
;
1075 case JV_CONSTANT_Double
:
1076 if (field
->type
!= JvPrimClass (double))
1077 throw_class_format_error ("erroneous field initializer");
1079 *(jdouble
*)addr
= _Jv_loadDouble (&pool
->data
[init
]);
1083 throw_class_format_error ("erroneous field initializer");
1087 inline static unsigned char*
1088 skip_one_type (unsigned char* ptr
)
1099 do { ch
= *ptr
++; } while (ch
!= ';');
1106 get_ffi_type_from_signature (unsigned char* ptr
)
1112 return &ffi_type_pointer
;
1116 // On some platforms a bool is a byte, on others an int.
1117 if (sizeof (jboolean
) == sizeof (jbyte
))
1118 return &ffi_type_sint8
;
1121 JvAssert (sizeof (jbyte
) == sizeof (jint
));
1122 return &ffi_type_sint32
;
1127 return &ffi_type_sint8
;
1131 return &ffi_type_uint16
;
1135 return &ffi_type_sint16
;
1139 return &ffi_type_sint32
;
1143 return &ffi_type_sint64
;
1147 return &ffi_type_float
;
1151 return &ffi_type_double
;
1155 return &ffi_type_void
;
1159 throw_internal_error ("unknown type in signature");
1162 /* this function yields the number of actual arguments, that is, if the
1163 * function is non-static, then one is added to the number of elements
1164 * found in the signature */
1167 _Jv_count_arguments (_Jv_Utf8Const
*signature
,
1170 unsigned char *ptr
= (unsigned char*) signature
->chars();
1171 int arg_count
= staticp
? 0 : 1;
1173 /* first, count number of arguments */
1181 ptr
= skip_one_type (ptr
);
1188 /* This beast will build a cif, given the signature. Memory for
1189 * the cif itself and for the argument types must be allocated by the
1194 _Jv_init_cif (_Jv_Utf8Const
* signature
,
1198 ffi_type
**arg_types
,
1201 unsigned char *ptr
= (unsigned char*) signature
->chars();
1203 int arg_index
= 0; // arg number
1204 int item_count
= 0; // stack-item count
1209 arg_types
[arg_index
++] = &ffi_type_pointer
;
1219 arg_types
[arg_index
++] = get_ffi_type_from_signature (ptr
);
1221 if (*ptr
== 'J' || *ptr
== 'D')
1226 ptr
= skip_one_type (ptr
);
1231 ffi_type
*rtype
= get_ffi_type_from_signature (ptr
);
1233 ptr
= skip_one_type (ptr
);
1234 if (ptr
!= (unsigned char*)signature
->chars() + signature
->len())
1235 throw_internal_error ("did not find end of signature");
1237 if (ffi_prep_cif (cif
, FFI_DEFAULT_ABI
,
1238 arg_count
, rtype
, arg_types
) != FFI_OK
)
1239 throw_internal_error ("ffi_prep_cif failed");
1241 if (rtype_p
!= NULL
)
1247 #if FFI_NATIVE_RAW_API
1248 # define FFI_PREP_RAW_CLOSURE ffi_prep_raw_closure
1249 # define FFI_RAW_SIZE ffi_raw_size
1251 # define FFI_PREP_RAW_CLOSURE ffi_prep_java_raw_closure
1252 # define FFI_RAW_SIZE ffi_java_raw_size
1255 /* we put this one here, and not in interpret.cc because it
1256 * calls the utility routines _Jv_count_arguments
1257 * which are static to this module. The following struct defines the
1258 * layout we use for the stubs, it's only used in the ncode method. */
1261 ffi_raw_closure closure
;
1263 ffi_type
*arg_types
[0];
1266 typedef void (*ffi_closure_fun
) (ffi_cif
*,void*,ffi_raw
*,void*);
1269 _Jv_InterpMethod::ncode ()
1271 using namespace java::lang::reflect
;
1273 if (self
->ncode
!= 0)
1276 jboolean staticp
= (self
->accflags
& Modifier::STATIC
) != 0;
1277 int arg_count
= _Jv_count_arguments (self
->signature
, staticp
);
1279 ncode_closure
*closure
=
1280 (ncode_closure
*)_Jv_AllocBytes (sizeof (ncode_closure
)
1281 + arg_count
* sizeof (ffi_type
*));
1283 _Jv_init_cif (self
->signature
,
1287 &closure
->arg_types
[0],
1290 ffi_closure_fun fun
;
1292 args_raw_size
= FFI_RAW_SIZE (&closure
->cif
);
1294 JvAssert ((self
->accflags
& Modifier::NATIVE
) == 0);
1296 if ((self
->accflags
& Modifier::SYNCHRONIZED
) != 0)
1301 fun
= (ffi_closure_fun
)&_Jv_InterpMethod::run_synch_class_debug
;
1303 fun
= (ffi_closure_fun
)&_Jv_InterpMethod::run_synch_class
;
1308 fun
= (ffi_closure_fun
)&_Jv_InterpMethod::run_synch_object_debug
;
1310 fun
= (ffi_closure_fun
)&_Jv_InterpMethod::run_synch_object
;
1318 fun
= (ffi_closure_fun
)&_Jv_InterpMethod::run_class_debug
;
1320 fun
= (ffi_closure_fun
)&_Jv_InterpMethod::run_class
;
1325 fun
= (ffi_closure_fun
)&_Jv_InterpMethod::run_normal_debug
;
1327 fun
= (ffi_closure_fun
)&_Jv_InterpMethod::run_normal
;
1331 FFI_PREP_RAW_CLOSURE (&closure
->closure
,
1336 self
->ncode
= (void*)closure
;
1340 /* Find the index of the given insn in the array of insn slots
1341 for this method. Returns -1 if not found. */
1343 _Jv_InterpMethod::insn_index (pc_t pc
)
1346 #ifdef DIRECT_THREADED
1347 jlong right
= number_insn_slots
;
1348 pc_t insns
= prepared
;
1350 jlong right
= code_length
;
1351 pc_t insns
= bytecode ();
1356 jlong mid
= (left
+ right
) / 2;
1357 if (&insns
[mid
] == pc
)
1360 if (pc
< &insns
[mid
])
1370 _Jv_InterpMethod::get_line_table (jlong
& start
, jlong
& end
,
1371 jintArray
& line_numbers
,
1372 jlongArray
& code_indices
)
1374 #ifdef DIRECT_THREADED
1375 /* For the DIRECT_THREADED case, if the method has not yet been
1376 * compiled, the linetable will change to insn slots instead of
1377 * bytecode PCs. It is probably easiest, in this case, to simply
1378 * compile the method and guarantee that we are using insn
1381 _Jv_CompileMethod (this);
1383 if (line_table_len
> 0)
1386 end
= number_insn_slots
;
1387 line_numbers
= JvNewIntArray (line_table_len
);
1388 code_indices
= JvNewLongArray (line_table_len
);
1390 jint
* lines
= elements (line_numbers
);
1391 jlong
* indices
= elements (code_indices
);
1392 for (int i
= 0; i
< line_table_len
; ++i
)
1394 lines
[i
] = line_table
[i
].line
;
1395 indices
[i
] = insn_index (line_table
[i
].pc
);
1398 #else // !DIRECT_THREADED
1399 if (line_table_len
> 0)
1403 line_numbers
= JvNewIntArray (line_table_len
);
1404 code_indices
= JvNewLongArray (line_table_len
);
1406 jint
* lines
= elements (line_numbers
);
1407 jlong
* indices
= elements (code_indices
);
1408 for (int i
= 0; i
< line_table_len
; ++i
)
1410 lines
[i
] = line_table
[i
].line
;
1411 indices
[i
] = (jlong
) line_table
[i
].bytecode_pc
;
1414 #endif // !DIRECT_THREADED
1418 _Jv_InterpMethod::install_break (jlong index
)
1420 return set_insn (index
, breakpoint_insn
);
1424 _Jv_InterpMethod::get_insn (jlong index
)
1428 #ifdef DIRECT_THREADED
1429 if (index
>= number_insn_slots
|| index
< 0)
1433 #else // !DIRECT_THREADED
1434 if (index
>= code_length
|| index
< 0)
1437 code
= reinterpret_cast<pc_t
> (bytecode ());
1438 #endif // !DIRECT_THREADED
1440 return &code
[index
];
1444 _Jv_InterpMethod::set_insn (jlong index
, pc_t insn
)
1446 #ifdef DIRECT_THREADED
1447 if (index
>= number_insn_slots
|| index
< 0)
1450 pc_t code
= prepared
;
1451 code
[index
].insn
= insn
->insn
;
1452 #else // !DIRECT_THREADED
1453 if (index
>= code_length
|| index
< 0)
1456 pc_t code
= reinterpret_cast<pc_t
> (bytecode ());
1457 code
[index
] = *insn
;
1458 #endif // !DIRECT_THREADED
1460 return &code
[index
];
1464 _Jv_JNIMethod::ncode ()
1466 using namespace java::lang::reflect
;
1468 if (self
->ncode
!= 0)
1471 jboolean staticp
= (self
->accflags
& Modifier::STATIC
) != 0;
1472 int arg_count
= _Jv_count_arguments (self
->signature
, staticp
);
1474 ncode_closure
*closure
=
1475 (ncode_closure
*)_Jv_AllocBytes (sizeof (ncode_closure
)
1476 + arg_count
* sizeof (ffi_type
*));
1479 _Jv_init_cif (self
->signature
,
1483 &closure
->arg_types
[0],
1486 ffi_closure_fun fun
;
1488 args_raw_size
= FFI_RAW_SIZE (&closure
->cif
);
1490 // Initialize the argument types and CIF that represent the actual
1491 // underlying JNI function.
1493 if ((self
->accflags
& Modifier::STATIC
))
1495 jni_arg_types
= (ffi_type
**) _Jv_AllocBytes ((extra_args
+ arg_count
)
1496 * sizeof (ffi_type
*));
1498 jni_arg_types
[offset
++] = &ffi_type_pointer
;
1499 if ((self
->accflags
& Modifier::STATIC
))
1500 jni_arg_types
[offset
++] = &ffi_type_pointer
;
1501 memcpy (&jni_arg_types
[offset
], &closure
->arg_types
[0],
1502 arg_count
* sizeof (ffi_type
*));
1504 if (ffi_prep_cif (&jni_cif
, _Jv_platform_ffi_abi
,
1505 extra_args
+ arg_count
, rtype
,
1506 jni_arg_types
) != FFI_OK
)
1507 throw_internal_error ("ffi_prep_cif failed for JNI function");
1509 JvAssert ((self
->accflags
& Modifier::NATIVE
) != 0);
1511 // FIXME: for now we assume that all native methods for
1512 // interpreted code use JNI.
1513 fun
= (ffi_closure_fun
) &_Jv_JNIMethod::call
;
1515 FFI_PREP_RAW_CLOSURE (&closure
->closure
,
1520 self
->ncode
= (void *) closure
;
1525 throw_class_format_error (jstring msg
)
1528 ? new java::lang::ClassFormatError (msg
)
1529 : new java::lang::ClassFormatError
);
1533 throw_class_format_error (const char *msg
)
1535 throw_class_format_error (JvNewStringLatin1 (msg
));
1541 _Jv_InterpreterEngine::do_verify (jclass klass
)
1543 _Jv_InterpClass
*iclass
= (_Jv_InterpClass
*) klass
->aux_info
;
1544 for (int i
= 0; i
< klass
->method_count
; i
++)
1546 using namespace java::lang::reflect
;
1547 _Jv_MethodBase
*imeth
= iclass
->interpreted_methods
[i
];
1548 _Jv_ushort accflags
= klass
->methods
[i
].accflags
;
1549 if ((accflags
& (Modifier::NATIVE
| Modifier::ABSTRACT
)) == 0)
1551 _Jv_InterpMethod
*im
= reinterpret_cast<_Jv_InterpMethod
*> (imeth
);
1552 _Jv_VerifyMethod (im
);
1558 _Jv_InterpreterEngine::do_create_ncode (jclass klass
)
1560 _Jv_InterpClass
*iclass
= (_Jv_InterpClass
*) klass
->aux_info
;
1561 for (int i
= 0; i
< klass
->method_count
; i
++)
1563 // Just skip abstract methods. This is particularly important
1564 // because we don't resize the interpreted_methods array when
1565 // miranda methods are added to it.
1566 if ((klass
->methods
[i
].accflags
1567 & java::lang::reflect::Modifier::ABSTRACT
)
1571 _Jv_MethodBase
*imeth
= iclass
->interpreted_methods
[i
];
1573 if ((klass
->methods
[i
].accflags
& java::lang::reflect::Modifier::NATIVE
)
1576 // You might think we could use a virtual `ncode' method in
1577 // the _Jv_MethodBase and unify the native and non-native
1578 // cases. Well, we can't, because we don't allocate these
1579 // objects using `new', and thus they don't get a vtable.
1580 _Jv_JNIMethod
*jnim
= reinterpret_cast<_Jv_JNIMethod
*> (imeth
);
1581 klass
->methods
[i
].ncode
= jnim
->ncode ();
1583 else if (imeth
!= 0) // it could be abstract
1585 _Jv_InterpMethod
*im
= reinterpret_cast<_Jv_InterpMethod
*> (imeth
);
1586 klass
->methods
[i
].ncode
= im
->ncode ();
1592 _Jv_InterpreterEngine::do_allocate_static_fields (jclass klass
,
1596 _Jv_InterpClass
*iclass
= (_Jv_InterpClass
*) klass
->aux_info
;
1598 // Splitting the allocations here lets us scan reference fields and
1599 // avoid scanning non-reference fields. How reference fields are
1600 // scanned is a bit tricky: we allocate using _Jv_AllocRawObj, which
1601 // means that this memory will be scanned conservatively (same
1602 // difference, since we know all the contents here are pointers).
1603 // Then we put pointers into this memory into the 'fields'
1604 // structure. Most of these are interior pointers, which is ok (but
1605 // even so the pointer to the first reference field will be used and
1606 // that is not an interior pointer). The 'fields' array is also
1607 // allocated with _Jv_AllocRawObj (see defineclass.cc), so it will
1608 // be scanned. A pointer to this array is held by Class and thus
1609 // seen by the collector.
1610 char *reference_fields
= (char *) _Jv_AllocRawObj (pointer_size
);
1611 char *non_reference_fields
= (char *) _Jv_AllocBytes (other_size
);
1613 for (int i
= 0; i
< klass
->field_count
; i
++)
1615 _Jv_Field
*field
= &klass
->fields
[i
];
1617 if ((field
->flags
& java::lang::reflect::Modifier::STATIC
) == 0)
1620 char *base
= field
->isRef() ? reference_fields
: non_reference_fields
;
1621 field
->u
.addr
= base
+ field
->u
.boffset
;
1623 if (iclass
->field_initializers
[i
] != 0)
1625 _Jv_Linker::resolve_field (field
, klass
->loader
);
1626 _Jv_InitField (0, klass
, i
);
1630 // Now we don't need the field_initializers anymore, so let the
1631 // collector get rid of it.
1632 iclass
->field_initializers
= 0;
1635 _Jv_ResolvedMethod
*
1636 _Jv_InterpreterEngine::do_resolve_method (_Jv_Method
*method
, jclass klass
,
1639 int arg_count
= _Jv_count_arguments (method
->signature
, staticp
);
1641 _Jv_ResolvedMethod
* result
= (_Jv_ResolvedMethod
*)
1642 _Jv_AllocBytes (sizeof (_Jv_ResolvedMethod
)
1643 + arg_count
*sizeof (ffi_type
*));
1645 result
->stack_item_count
1646 = _Jv_init_cif (method
->signature
,
1650 &result
->arg_types
[0],
1653 result
->method
= method
;
1654 result
->klass
= klass
;
1660 _Jv_InterpreterEngine::do_post_miranda_hook (jclass klass
)
1662 _Jv_InterpClass
*iclass
= (_Jv_InterpClass
*) klass
->aux_info
;
1663 for (int i
= 0; i
< klass
->method_count
; i
++)
1665 // Just skip abstract methods. This is particularly important
1666 // because we don't resize the interpreted_methods array when
1667 // miranda methods are added to it.
1668 if ((klass
->methods
[i
].accflags
1669 & java::lang::reflect::Modifier::ABSTRACT
)
1672 // Miranda method additions mean that the `methods' array moves.
1673 // We cache a pointer into this array, so we have to update.
1674 iclass
->interpreted_methods
[i
]->self
= &klass
->methods
[i
];
1678 #ifdef DIRECT_THREADED
1680 _Jv_CompileMethod (_Jv_InterpMethod
* method
)
1682 if (method
->prepared
== NULL
)
1685 _Jv_InterpMethod::run_debug (NULL
, NULL
, method
);
1687 _Jv_InterpMethod::run (NULL
, NULL
, method
);
1690 #endif // DIRECT_THREADED
1692 #endif // INTERPRETER