315 lines
7.5 KiB
C++
315 lines
7.5 KiB
C++
// java-interp.h - Header file for the bytecode interpreter. -*- c++ -*-
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/* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 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 <java/lang/reflect/Modifier.h>
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#include <java/lang/Thread.h>
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#include <gnu/gcj/RawData.h>
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// Define this to get the direct-threaded interpreter. If undefined,
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// we revert to a basic bytecode interpreter. The former is faster
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// but uses more memory.
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#define DIRECT_THREADED
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#include <ffi.h>
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struct _Jv_ResolvedMethod;
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void _Jv_InitInterpreter ();
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void _Jv_DefineClass (jclass, jbyteArray, jint, jint,
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java::security::ProtectionDomain *,
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_Jv_Utf8Const **);
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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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void _Jv_CompileMethod (_Jv_InterpMethod* method);
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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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jclass 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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friend class _Jv_InterpreterEngine;
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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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// The type of the PC depends on whether we're doing direct threading
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// or a more ordinary bytecode interpreter.
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#ifdef DIRECT_THREADED
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// Slot in the "compiled" form of the bytecode.
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union insn_slot
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{
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// Address of code.
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void *insn;
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// An integer value used by an instruction.
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jint int_val;
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// A pointer value used by an instruction.
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void *datum;
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};
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typedef insn_slot *pc_t;
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#else
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typedef unsigned char *pc_t;
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#endif
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// This structure holds the bytecode pc and corresponding source code
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// line number. An array (plus length field) of this structure is put
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// in each _Jv_InterpMethod and used to resolve the (internal) program
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// counter of the interpreted method to an actual java source file
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// line.
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struct _Jv_LineTableEntry
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{
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union
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{
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pc_t pc;
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int bytecode_pc;
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};
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int line;
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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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bool is_15;
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// Length of the line_table - when this is zero then line_table is NULL.
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int line_table_len;
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_Jv_LineTableEntry *line_table;
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void *prepared;
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int number_insn_slots;
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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_class (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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static void run (void*, ffi_raw *, _Jv_InterpMethod *);
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// Returns source file line number for given PC value, or -1 if line
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// number info is unavailable.
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int get_source_line(pc_t mpc);
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#ifdef DIRECT_THREADED
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// Convenience function for indexing bytecode PC/insn slots in
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// line tables for JDWP
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jlong insn_index (pc_t pc);
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#endif
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public:
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static void dump_object(jobject o);
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/* Get the line table for this method.
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* start is the lowest index in the method
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* end is the highest index in the method
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* line_numbers is an array to hold the list of source line numbers
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* code_indices is an array to hold the corresponding list of code indices
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*/
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void get_line_table (jlong& start, jlong& end, jintArray& line_numbers,
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jlongArray& code_indices);
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#ifdef DIRECT_THREADED
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friend void _Jv_CompileMethod (_Jv_InterpMethod*);
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#endif
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friend class _Jv_ClassReader;
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friend class _Jv_BytecodeVerifier;
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friend class _Jv_StackTrace;
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friend class _Jv_InterpreterEngine;
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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
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{
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_Jv_MethodBase **interpreted_methods;
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_Jv_ushort *field_initializers;
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jstring source_file_name;
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friend class _Jv_ClassReader;
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friend class _Jv_InterpMethod;
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friend class _Jv_StackTrace;
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friend class _Jv_InterpreterEngine;
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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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{
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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 class _Jv_InterpreterEngine;
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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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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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// The interpreted call stack, represented by a linked list of frames.
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struct _Jv_InterpFrame
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{
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_Jv_InterpMethod *self;
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java::lang::Thread *thread;
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_Jv_InterpFrame *next;
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pc_t pc;
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_Jv_InterpFrame (_Jv_InterpMethod *s, java::lang::Thread *thr)
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{
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self = s;
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thread = thr;
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next = (_Jv_InterpFrame *) thr->interp_frame;
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thr->interp_frame = (gnu::gcj::RawData *) this;
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pc = NULL;
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}
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~_Jv_InterpFrame ()
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{
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thread->interp_frame = (gnu::gcj::RawData *) 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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