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Add "addstrings" option (disabled by default) to select whether to automatically concatenate strings during constant folding.

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Sei Lisa 2015-02-28 20:01:51 +01:00
parent 6ea01c4242
commit 8f83e2f1ab
3 changed files with 14 additions and 7 deletions
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15
main.py
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@ -27,9 +27,15 @@ Options (+ means active by default, - means inactive by default):
allowkeyconcat + Allow string + key and key + string (both return string)
allowmultistrings + Allow C-like string juxtaposition, e.g. "ab" "cd" means
"abcd", no concatenation involved. Very useful when used
with a preprocessor (although the optimizer would
optimize concatenated strings if they are parenthesized
correctly, see note at the footer).
with a preprocessor. Similar to addstrings, but this one
is not an optimization, it introduces new syntax.
addstrings - Concatenate strings together when possible. Note that
such an optimization can be counter-productive in some
cases, that's why it is unset by default. For example:
string a="a"+"longstring"; string b="b"+"longstring";
would keep a single copy of "longstring", while if the
strings are added, "alongstring" and "blongstring" would
both take memory.
skippreproc + Skip preprocessor directives in the source as if they
were comments. Not useful unless the script is itself
the output of a preprocessor like cpp, which inserts
@ -55,9 +61,6 @@ Options (+ means active by default, - means inactive by default):
process, it turns the script into unreadable gibberish,
hard to debug, but this gets big savings for complex
scripts.
Note that the optimizer doesn't reorder expressions to fold constants. This
means that e.g. a + 3 + 5 is not optimized to a + 8; however a + (3 + 5) is.
''' % sys.argv[0])
return 1