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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.cpp
+30 -5
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@@ -411,7 +411,8 @@ vm_run_global (void)
ecma_make_object_value (glob_obj_p),
lex_env_p,
is_strict,
false);
false,
NULL);
jerry_completion_code_t ret_code;
@@ -479,7 +480,8 @@ vm_run_eval (const bytecode_data_header_t *bytecode_data_p, /**< byte-code data
this_binding,
lex_env_p,
is_strict,
true);
true,
NULL);
if (ecma_is_completion_value_return (completion))
{
@@ -595,7 +597,13 @@ vm_run_from_pos (const bytecode_data_header_t *header_p, /**< byte-code data hea
ecma_value_t this_binding_value, /**< value of 'ThisBinding' */
ecma_object_t *lex_env_p, /**< lexical environment to use */
bool is_strict, /**< is the code is strict mode code (ECMA-262 v5, 10.1.1) */
bool is_eval_code) /**< is the code is eval code (ECMA-262 v5, 10.1) */
bool is_eval_code, /**< is the code is eval code (ECMA-262 v5, 10.1) */
ecma_collection_header_t *arg_collection_p) /**<
* - collection of function call arguments,
* if arguments for the called function
* are placed on registers;
* - NULL - otherwise.
*/
{
ecma_completion_value_t completion;
@@ -605,8 +613,9 @@ vm_run_from_pos (const bytecode_data_header_t *header_p, /**< byte-code data hea
const uint32_t tmp_regs_num = curr->data.reg_var_decl.tmp_regs_num;
const uint32_t local_var_regs_num = curr->data.reg_var_decl.local_var_regs_num;
const uint32_t arg_regs_num = curr->data.reg_var_decl.arg_regs_num;
uint32_t regs_num = VM_SPECIAL_REGS_NUMBER + tmp_regs_num + local_var_regs_num;
uint32_t regs_num = VM_SPECIAL_REGS_NUMBER + tmp_regs_num + local_var_regs_num + arg_regs_num;
MEM_DEFINE_LOCAL_ARRAY (regs, regs_num, ecma_value_t);
@@ -619,7 +628,7 @@ vm_run_from_pos (const bytecode_data_header_t *header_p, /**< byte-code data hea
frame_ctx.is_call_in_direct_eval_form = false;
frame_ctx.tmp_num_p = ecma_alloc_number ();
vm_stack_add_frame (&frame_ctx.stack_frame, regs, regs_num, local_var_regs_num);
vm_stack_add_frame (&frame_ctx.stack_frame, regs, regs_num, local_var_regs_num, arg_regs_num, arg_collection_p);
vm_stack_frame_set_reg_value (&frame_ctx.stack_frame,
VM_REG_SPECIAL_THIS_BINDING,
ecma_copy_value (this_binding_value, false));
@@ -676,6 +685,22 @@ vm_get_scope_flags (const bytecode_data_header_t *bytecode_header_p, /**< byte-c
return (opcode_scope_code_flags_t) flags_instr.data.meta.data_1;
} /* vm_get_scope_flags */
/**
* Get arguments number, encoded in specified reg_var_decl instruction
*
* @return value of "arguments number" reg_var_decl's parameter
*/
uint8_t
vm_get_scope_args_num (const bytecode_data_header_t *bytecode_header_p, /**< byte-code data */
vm_instr_counter_t reg_var_decl_oc) /**< position of reg_var_decl instruction */
{
const vm_instr_t *instrs_p = bytecode_header_p->instrs_p;
const vm_instr_t *reg_var_decl_instr_p = &instrs_p[reg_var_decl_oc];
JERRY_ASSERT (reg_var_decl_instr_p->op_idx == VM_OP_REG_VAR_DECL);
return reg_var_decl_instr_p->data.reg_var_decl.arg_regs_num;
} /* vm_get_scope_args_num */
/**
* Check whether currently executed code is strict mode code
*