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args.c
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args.c
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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 <assert.h>
#include "jit/expression.h"
#include "jit/args.h"
#include "vm/method.h"
#include "lib/stack.h"
#ifdef CONFIG_ARGS_MAP
static inline void set_expr_arg_reg(struct expression *expr,
struct vm_method *method,
int index)
{
expr->arg_reg = method->args_map[index].reg;
}
#else /* CONFIG_ARGS_MAP */
static void set_expr_arg_reg(struct expression *expr,
struct vm_method *method,
int index)
{
}
#endif /* CONFIG_ARGS_MAP */
static bool is_this_arg(struct vm_method *method, int index)
{
if (vm_method_is_static(method))
return false;
if (vm_method_is_jni(method))
return index == 1;
return index == 0;
}
static struct expression *
insert_arg(struct expression *root, struct expression *expr, struct vm_method *method, int index)
{
struct expression *_expr;
/* Check if we should put @expr in EXPR_ARG_THIS. */
if (is_this_arg(method, index))
_expr = arg_this_expr(expr);
else
_expr = arg_expr(expr);
_expr->bytecode_offset = expr->bytecode_offset;
set_expr_arg_reg(_expr, method, index);
if (!root)
return _expr;
return args_list_expr(root, _expr);
}
struct expression *
convert_args(struct stack *mimic_stack, unsigned long nr_args, struct vm_method *method)
{
struct expression *args_list = NULL;
unsigned long nr_total_args;
unsigned long i;
nr_total_args = nr_args;
if (vm_method_is_jni(method)) {
if (vm_method_is_static(method))
nr_total_args++;
nr_total_args++;
}
if (nr_total_args == 0) {
args_list = no_args_expr();
goto out;
}
/*
* We scan the args map in reverse order, since the order of arguments
* is already reversed.
*/
for (i = 0; i < nr_args; i++) {
struct expression *expr = stack_pop(mimic_stack);
if (vm_type_is_pair(expr->vm_type))
i++;
if (i >= nr_args)
break;
args_list = insert_arg(args_list, expr, method, nr_total_args - i - 1);
}
if (vm_method_is_jni(method)) {
struct expression *expr;
if (vm_method_is_static(method)) {
expr = value_expr(J_REFERENCE, (unsigned long) method->class->object);
if (!expr)
goto error;
args_list = insert_arg(args_list, expr, method, 1);
}
/*
* JNI methods also need a pointer to JNI environment. That's
* done in jni_trampoline automagically which is why we never
* use method index zero here for JNI methods.
*/
}
out:
return args_list;
error:
expr_put(args_list);
return NULL;
}
static struct expression *
insert_native_arg(struct expression *root, struct expression *expr)
{
struct expression *_expr;
_expr = arg_expr(expr);
_expr->bytecode_offset = expr->bytecode_offset;
if (!root)
return _expr;
return args_list_expr(root, _expr);
}
/**
* This function prepares argument list that will be used
* with the native VM call. All arguments are passed on stack.
*/
struct expression *
convert_native_args(struct stack *mimic_stack, unsigned long nr_args)
{
struct expression *args_list = NULL;
unsigned long i;
if (nr_args == 0) {
args_list = no_args_expr();
goto out;
}
for (i = 0; i < nr_args; i++) {
struct expression *expr = stack_pop(mimic_stack);
args_list = insert_native_arg(args_list, expr);
}
out:
return args_list;
}