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/*
* Copyright (c) 2008 Pekka Enberg
*
* This file is released under the GPL version 2 with the following
* clarification and special exception:
*
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under terms
* of your choice, provided that you also meet, for each linked independent
* module, the terms and conditions of the license of that module. An
* independent module is a module which is not derived from or based on
* this library. If you modify this library, you may extend this exception
* to your version of the library, but you are not obligated to do so. If
* you do not wish to do so, delete this exception statement from your
* version.
*
* Please refer to the file LICENSE for details.
*/
#include "jit/vtable.h"
#include "jit/compilation-unit.h"
#include "vm/class.h"
#include <stdlib.h>
void vtable_init(struct vtable *vtable, unsigned int nr_methods)
{
vtable->native_ptr = calloc(nr_methods, sizeof(void *));
}
void vtable_release(struct vtable *vtable)
{
free(vtable->native_ptr);
}
void vtable_setup_method(struct vtable *vtable, unsigned long idx, void *native_ptr)
{
vtable->native_ptr[idx] = native_ptr;
}
/**
* This function replaces pointers in vtable so that they point
* directly to compiled code instead of trampoline code.
*/
void fixup_vtable(struct compilation_unit *cu, struct vm_object *this,
void *target)
{
struct vm_class *vmc = this->class;
struct vm_method *vmm = cu->method;
int index = vmm->virtual_index;
/*
* A method can be invoked by invokevirtual and invokespecial. For
* example, a public method p() in class A is normally invoked with
* invokevirtual but if a class B that extends A calls that
* method by "super.p()" we use invokespecial instead.
*
* We must not fixup vtable entry in the class of this when this method
* was invoked by invokespecial.
*/
if (vmc->vtable.native_ptr[index] == vm_method_trampoline_ptr(vmm))
vmc->vtable.native_ptr[index] = target;
/* Fixup the vtable entry in declaring class */
vmm->class->vtable.native_ptr[index] = target;
}
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