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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/opcodes.h
+5 -1
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@@ -164,8 +164,12 @@ typedef enum : vm_idx_t
OPCODE_SCOPE_CODE_FLAGS_STRICT = (1u << 0), /**< code is strict mode code */
OPCODE_SCOPE_CODE_FLAGS_NOT_REF_ARGUMENTS_IDENTIFIER = (1u << 1), /**< code doesn't reference
* 'arguments' identifier */
OPCODE_SCOPE_CODE_FLAGS_NOT_REF_EVAL_IDENTIFIER = (1u << 2) /**< code doesn't reference
OPCODE_SCOPE_CODE_FLAGS_NOT_REF_EVAL_IDENTIFIER = (1u << 2), /**< code doesn't reference
* 'eval' identifier */
OPCODE_SCOPE_CODE_FLAGS_ARGUMENTS_ON_REGISTERS = (1u << 3), /**< function's arguments are moved to registers,
* so should be initialized in vm registers,
* and not in lexical environment */
OPCODE_SCOPE_CODE_FLAGS_NO_LEX_ENV = (1u << 4) /**< no lex. env. is necessary for the function */
} opcode_scope_code_flags_t;
/**