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Introduce parser-time optimization that moves function's argument values to registers.

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For functions with the optimization applied:
 - vm puts arguments values immediately to registers without putting them to variables in lexical environment;
 - number of arguments is extracted from corresponding 'reg_var_decl' instruction's argument;
 - for functions that also don't have local variables, lexical environments are not created.

JerryScript-DCO-1.0-Signed-off-by: Ruben Ayrapetyan r.ayrapetyan@samsung.com
This commit is contained in:
Ruben Ayrapetyan
2015-10-26 16:23:06 +03:00
parent 46c65985e5
commit 1fe2817457
16 changed files with 604 additions and 194 deletions
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jerry-core/vm/vm-stack.cpp
+21 -3
View File
@@ -77,8 +77,13 @@ void
vm_stack_add_frame (vm_stack_frame_t *frame_p, /**< frame to initialize */
ecma_value_t *regs_p, /**< array of register variables' values */
uint32_t regs_num, /**< total number of register variables */
uint32_t local_vars_regs_num) /**< number of register variables,
uint32_t local_vars_regs_num, /**< number of register variables,
* used for local variables */
uint32_t arg_regs_num, /**< number of register variables,
* used for arguments */
ecma_collection_header_t *arguments_p) /**< collection of arguments
* (for case, their values
* are moved to registers) */
{
frame_p->prev_frame_p = vm_stack_top_frame_p;
vm_stack_top_frame_p = frame_p;
@@ -91,17 +96,30 @@ vm_stack_add_frame (vm_stack_frame_t *frame_p, /**< frame to initialize */
JERRY_ASSERT (regs_num >= VM_SPECIAL_REGS_NUMBER);
for (uint32_t i = 0; i < regs_num - local_vars_regs_num; i++)
for (uint32_t i = 0; i < regs_num - local_vars_regs_num - arg_regs_num; i++)
{
regs_p[i] = ecma_make_simple_value (ECMA_SIMPLE_VALUE_EMPTY);
}
for (uint32_t i = regs_num - local_vars_regs_num;
for (uint32_t i = regs_num - local_vars_regs_num - arg_regs_num;
i < regs_num;
i++)
{
regs_p[i] = ecma_make_simple_value (ECMA_SIMPLE_VALUE_UNDEFINED);
}
if (arg_regs_num != 0)
{
ecma_collection_iterator_t args_iterator;
ecma_collection_iterator_init (&args_iterator, arguments_p);
for (uint32_t i = regs_num - arg_regs_num;
i < regs_num && ecma_collection_iterator_next (&args_iterator);
i++)
{
regs_p[i] = ecma_copy_value (*args_iterator.current_value_p, false);
}
}
} /* vm_stack_add_frame */
/**