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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/pretty-printer.cpp
+11 -1
View File
@@ -221,7 +221,7 @@ pp_op_meta (const bytecode_data_header_t *bytecode_data_p,
PP_OP (VM_OP_PRE_INCR, "%s = ++%s;");
PP_OP (VM_OP_PRE_DECR, "%s = --%s;");
PP_OP (VM_OP_THROW_VALUE, "throw %s;");
PP_OP (VM_OP_REG_VAR_DECL, "%d tmp regs, %d local variable regs");
PP_OP (VM_OP_REG_VAR_DECL, "%d tmp regs, %d local variable regs, %d argument variable regs");
PP_OP (VM_OP_VAR_DECL, "var %s;");
PP_OP (VM_OP_RETVAL, "return %s;");
PP_OP (VM_OP_RET, "ret;");
@@ -572,6 +572,16 @@ pp_op_meta (const bytecode_data_header_t *bytecode_data_p,
printf ("[no 'eval'] ");
scope_flags &= (vm_idx_t) ~(OPCODE_SCOPE_CODE_FLAGS_NOT_REF_EVAL_IDENTIFIER);
}
if (scope_flags & OPCODE_SCOPE_CODE_FLAGS_ARGUMENTS_ON_REGISTERS)
{
printf ("[arguments are placed on registers] ");
scope_flags &= (vm_idx_t) ~(OPCODE_SCOPE_CODE_FLAGS_ARGUMENTS_ON_REGISTERS);
}
if (scope_flags & OPCODE_SCOPE_CODE_FLAGS_NO_LEX_ENV)
{
printf ("[no lexical environment should be created for the scope] ");
scope_flags &= (vm_idx_t) ~(OPCODE_SCOPE_CODE_FLAGS_NO_LEX_ENV);
}
JERRY_ASSERT (scope_flags == 0);
}