patcher-common.hpp

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/* src/vm/jit/patcher-common.hpp - architecture independent code patching stuff

   Copyright (C) 1996-2011
   CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO

   This file is part of CACAO.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

*/


#ifndef _PATCHER_COMMON_HPP
#define _PATCHER_COMMON_HPP

/* forward typedefs ***********************************************************/

typedef struct patchref_t patchref_t;

#include "config.h"
#include "vm/types.hpp"

#include "toolbox/list.hpp"

#include "vm/global.hpp"

struct jitdata;

/* patchref_t ******************************************************************

   A patcher reference contains information about a code position
   which needs additional code patching during runtime.

*******************************************************************************/

struct patchref_t {
    uintptr_t    mpc;           /* absolute position in code segment          */
    uintptr_t    datap;         /* absolute position in data segment          */
    int32_t      disp;          /* displacement of ref in the data segment    */
    int16_t      disp_mb;       /* auxiliary code displacement (for membar)   */
    int16_t      patch_align;   /* auxiliary displacement for alignment       */
    functionptr  patcher;       /* patcher function to call                   */
    void*        ref;           /* reference passed                           */
    uint32_t     mcode;         /* machine code to be patched back in         */
};

/* patcher_function_list *******************************************************

   This is a list which maps patcher function pointers to the according
   names of the patcher functions. It is only usefull for debugging
   purposes.

*******************************************************************************/

#if !defined(NDEBUG)
typedef struct patcher_function_list_t {
    functionptr patcher;
    const char* name;
} patcher_function_list_t;

extern patcher_function_list_t patcher_function_list[];
#endif

/* function prototypes ********************************************************/

void patcher_list_create(codeinfo *code);
void patcher_list_reset(codeinfo *code);
void patcher_list_free(codeinfo *code);

#if !defined(NDEBUG)
void patcher_list_show(codeinfo *code);
#endif

patchref_t *patcher_add_patch_ref(jitdata *jd, functionptr patcher, void* ref, s4 disp);

void patcher_resolve(codeinfo* code);

bool patcher_is_patched(patchref_t* pr);
bool patcher_is_patched_at(void* pc);

// MD function.
bool patcher_is_valid_trap_instruction_at(void* pc);

bool patcher_handler(u1 *pc);


/* empty patcher (just patches back original mcode) ***************************/

void patcher_patch_code(patchref_t *pr);


/* patcher prototypes and macros **********************************************/

/* new patcher functions */

bool patcher_resolve_class(patchref_t *pr);
#define PATCHER_resolve_class (functionptr) patcher_resolve_class

bool patcher_initialize_class(patchref_t *pr);
#define PATCHER_initialize_class (functionptr) patcher_initialize_class

bool patcher_resolve_classref_to_classinfo(patchref_t *pr);
#define PATCHER_resolve_classref_to_classinfo (functionptr) patcher_resolve_classref_to_classinfo

bool patcher_resolve_classref_to_vftbl(patchref_t *pr);
#define PATCHER_resolve_classref_to_vftbl (functionptr) patcher_resolve_classref_to_vftbl

bool patcher_resolve_classref_to_index(patchref_t *pr);
#define PATCHER_resolve_classref_to_index (functionptr) patcher_resolve_classref_to_index

bool patcher_resolve_classref_to_flags(patchref_t *pr);
#define PATCHER_resolve_classref_to_flags (functionptr) patcher_resolve_classref_to_flags

bool patcher_resolve_native_function(patchref_t *pr);
#define PATCHER_resolve_native_function (functionptr) patcher_resolve_native_function

bool patcher_breakpoint(patchref_t *pr);
#define PATCHER_breakpoint (functionptr) patcher_breakpoint

/* old patcher functions */

bool patcher_get_putstatic(patchref_t *pr);
#define PATCHER_get_putstatic (functionptr) patcher_get_putstatic

bool patcher_get_putfield(patchref_t *pr);
#define PATCHER_get_putfield (functionptr) patcher_get_putfield

bool patcher_invokestatic_special(patchref_t *pr);
#define PATCHER_invokestatic_special (functionptr) patcher_invokestatic_special

bool patcher_invokevirtual(patchref_t *pr);
#define PATCHER_invokevirtual (functionptr) patcher_invokevirtual

bool patcher_invokeinterface(patchref_t *pr);
#define PATCHER_invokeinterface (functionptr) patcher_invokeinterface

bool patcher_checkcast_interface(patchref_t *pr);
#define PATCHER_checkcast_interface (functionptr) patcher_checkcast_interface

bool patcher_instanceof_interface(patchref_t *pr);
#define PATCHER_instanceof_interface (functionptr) patcher_instanceof_interface

#if defined(__S390__)

bool patcher_checkcast_instanceof_interface(patchref_t *pr);
#define PATCHER_checkcast_instanceof_interface (functionptr) patcher_checkcast_instanceof_interface

#endif /* defined(__S390__) */

#endif // _PATCHER_COMMON_HPP


/*
 * These are local overrides for various environment variables in Emacs.
 * Please do not remove this and leave it at the end of the file, where
 * Emacs will automagically detect them.
 * ---------------------------------------------------------------------
 * Local variables:
 * mode: c++
 * indent-tabs-mode: t
 * c-basic-offset: 4
 * tab-width: 4
 * End:
 * vim:noexpandtab:sw=4:ts=4:
 */