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Issue #27078: Added BUILD_STRING opcode. Optimized f-strings evaluation.

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This commit is contained in:
Serhiy Storchaka 2016-09-06 22:07:53 +03:00
parent 620bb277f8
commit ea525a2d1a
14 changed files with 396 additions and 356 deletions
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26
Python/compile.c
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@ -970,6 +970,7 @@ PyCompile_OpcodeStackEffect(int opcode, int oparg)
case BUILD_TUPLE:
case BUILD_LIST:
case BUILD_SET:
case BUILD_STRING:
return 1-oparg;
case BUILD_LIST_UNPACK:
case BUILD_TUPLE_UNPACK:
@ -3315,31 +3316,8 @@ compiler_call(struct compiler *c, expr_ty e)
static int
compiler_joined_str(struct compiler *c, expr_ty e)
{
/* Concatenate parts of a string using ''.join(parts). There are
probably better ways of doing this.
This is used for constructs like "'x=' f'{42}'", which have to
be evaluated at compile time. */
static PyObject *empty_string;
static PyObject *join_string;
if (!empty_string) {
empty_string = PyUnicode_FromString("");
if (!empty_string)
return 0;
}
if (!join_string) {
join_string = PyUnicode_FromString("join");
if (!join_string)
return 0;
}
ADDOP_O(c, LOAD_CONST, empty_string, consts);
ADDOP_NAME(c, LOAD_ATTR, join_string, names);
VISIT_SEQ(c, expr, e->v.JoinedStr.values);
ADDOP_I(c, BUILD_LIST, asdl_seq_LEN(e->v.JoinedStr.values));
ADDOP_I(c, CALL_FUNCTION, 1);
ADDOP_I(c, BUILD_STRING, asdl_seq_LEN(e->v.JoinedStr.values));
return 1;
}