| // java-interp.h - Header file for the bytecode interpreter. -*- c++ -*- |
| |
| /* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 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 <java/lang/Thread.h> |
| #include <gnu/gcj/RawData.h> |
| |
| // Define this to get the direct-threaded interpreter. If undefined, |
| // we revert to a basic bytecode interpreter. The former is faster |
| // but uses more memory. |
| #define DIRECT_THREADED |
| |
| #include <ffi.h> |
| |
| struct _Jv_ResolvedMethod; |
| |
| void _Jv_InitInterpreter (); |
| void _Jv_DefineClass (jclass, jbyteArray, jint, jint, |
| java::security::ProtectionDomain *, |
| _Jv_Utf8Const **); |
| |
| 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); |
| void _Jv_CompileMethod (_Jv_InterpMethod* method); |
| |
| /* 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. |
| jclass defining_class; |
| |
| // The method description. |
| _Jv_Method *self; |
| |
| // Size of raw arguments. |
| _Jv_ushort args_raw_size; |
| |
| friend class _Jv_InterpreterEngine; |
| |
| public: |
| _Jv_Method *get_method () |
| { |
| return self; |
| } |
| }; |
| |
| // The type of the PC depends on whether we're doing direct threading |
| // or a more ordinary bytecode interpreter. |
| #ifdef DIRECT_THREADED |
| // Slot in the "compiled" form of the bytecode. |
| union insn_slot |
| { |
| // Address of code. |
| void *insn; |
| // An integer value used by an instruction. |
| jint int_val; |
| // A pointer value used by an instruction. |
| void *datum; |
| }; |
| |
| typedef insn_slot *pc_t; |
| #else |
| typedef unsigned char *pc_t; |
| #endif |
| |
| |
| // This structure holds the bytecode pc and corresponding source code |
| // line number. An array (plus length field) of this structure is put |
| // in each _Jv_InterpMethod and used to resolve the (internal) program |
| // counter of the interpreted method to an actual java source file |
| // line. |
| struct _Jv_LineTableEntry |
| { |
| union |
| { |
| pc_t pc; |
| int bytecode_pc; |
| }; |
| int line; |
| }; |
| |
| class _Jv_InterpMethod : public _Jv_MethodBase |
| { |
| // Breakpoint instruction |
| static pc_t breakpoint_insn; |
| #ifdef DIRECT_THREADED |
| static insn_slot bp_insn_slot; |
| #else |
| static unsigned char bp_insn_opcode; |
| #endif |
| |
| _Jv_ushort max_stack; |
| _Jv_ushort max_locals; |
| int code_length; |
| |
| _Jv_ushort exc_count; |
| bool is_15; |
| |
| // Length of the line_table - when this is zero then line_table is NULL. |
| int line_table_len; |
| _Jv_LineTableEntry *line_table; |
| |
| pc_t prepared; |
| int number_insn_slots; |
| |
| 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*); |
| |
| static void run_normal_debug (ffi_cif*, void*, ffi_raw*, void*); |
| static void run_synch_object_debug (ffi_cif*, void*, ffi_raw*, void*); |
| static void run_class_debug (ffi_cif*, void*, ffi_raw*, void*); |
| static void run_synch_class_debug (ffi_cif*, void*, ffi_raw*, void*); |
| |
| static void run (void *, ffi_raw *, _Jv_InterpMethod *); |
| static void run_debug (void *, ffi_raw *, _Jv_InterpMethod *); |
| |
| |
| |
| // Returns source file line number for given PC value, or -1 if line |
| // number info is unavailable. |
| int get_source_line(pc_t mpc); |
| |
| // Convenience function for indexing bytecode PC/insn slots in |
| // line tables for JDWP |
| jlong insn_index (pc_t pc); |
| |
| public: |
| |
| /* Get the line table for this method. |
| * start is the lowest index in the method |
| * end is the highest index in the method |
| * line_numbers is an array to hold the list of source line numbers |
| * code_indices is an array to hold the corresponding list of code indices |
| */ |
| void get_line_table (jlong& start, jlong& end, jintArray& line_numbers, |
| jlongArray& code_indices); |
| |
| /* Installs a break instruction at the given code index. Returns |
| the pc_t of the breakpoint or NULL if index is invalid. */ |
| pc_t install_break (jlong index); |
| |
| // Gets the instruction at the given index |
| pc_t get_insn (jlong index); |
| |
| /* Writes the given instruction at the given code index. Returns |
| the insn or NULL if index is invalid. */ |
| pc_t set_insn (jlong index, pc_t insn); |
| |
| #ifdef DIRECT_THREADED |
| friend void _Jv_CompileMethod (_Jv_InterpMethod*); |
| #endif |
| |
| friend class _Jv_ClassReader; |
| friend class _Jv_BytecodeVerifier; |
| friend class _Jv_StackTrace; |
| friend class _Jv_InterpreterEngine; |
| |
| #ifdef JV_MARKOBJ_DECL |
| friend JV_MARKOBJ_DECL; |
| #endif |
| }; |
| |
| class _Jv_InterpClass |
| { |
| _Jv_MethodBase **interpreted_methods; |
| _Jv_ushort *field_initializers; |
| jstring source_file_name; |
| |
| friend class _Jv_ClassReader; |
| friend class _Jv_InterpMethod; |
| friend class _Jv_StackTrace; |
| friend class _Jv_InterpreterEngine; |
| |
| friend void _Jv_InitField (jobject, jclass, int); |
| #ifdef JV_MARKOBJ_DECL |
| friend JV_MARKOBJ_DECL; |
| #endif |
| |
| friend _Jv_MethodBase ** _Jv_GetFirstMethod (_Jv_InterpClass *klass); |
| }; |
| |
| extern inline _Jv_MethodBase ** |
| _Jv_GetFirstMethod (_Jv_InterpClass *klass) |
| { |
| return klass->interpreted_methods; |
| } |
| |
| struct _Jv_ResolvedMethod |
| { |
| jint stack_item_count; |
| 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 class _Jv_InterpreterEngine; |
| |
| #ifdef JV_MARKOBJ_DECL |
| friend JV_MARKOBJ_DECL; |
| #endif |
| |
| public: |
| // FIXME: this is ugly. |
| void set_function (void *f) |
| { |
| function = f; |
| } |
| }; |
| |
| // The interpreted call stack, represented by a linked list of frames. |
| struct _Jv_InterpFrame |
| { |
| _Jv_InterpMethod *self; |
| java::lang::Thread *thread; |
| _Jv_InterpFrame *next; |
| pc_t pc; |
| |
| _Jv_InterpFrame (_Jv_InterpMethod *s, java::lang::Thread *thr) |
| { |
| self = s; |
| thread = thr; |
| next = (_Jv_InterpFrame *) thr->interp_frame; |
| thr->interp_frame = (gnu::gcj::RawData *) this; |
| pc = NULL; |
| } |
| |
| ~_Jv_InterpFrame () |
| { |
| thread->interp_frame = (gnu::gcj::RawData *) next; |
| } |
| }; |
| |
| #endif /* INTERPRETER */ |
| |
| #endif /* __JAVA_INTERP_H__ */ |