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Dave Hylands 9f76dcd682 py: Prevent many extra vstr allocations. 
I checked the entire codebase, and every place that vstr_init_len
was called, there was a call to mp_obj_new_str_from_vstr after it.

mp_obj_new_str_from_vstr always tries to reallocate a new buffer
1 byte larger than the original to store the terminating null
character.

In many cases, if we allocated the initial buffer to be 1 byte
longer, we can prevent this extra allocation, and just reuse
the originally allocated buffer.

Asking to read 256 bytes and only getting 100 will still cause
the extra allocation, but if you ask to read 256 and get 256
then the extra allocation will be optimized away.

Yes - the reallocation is optimized in the heap to try and reuse
the buffer if it can, but it takes quite a few cycles to figure
this out.

Note by Damien: vstr_init_len should now be considered as a
string-init convenience function and used only when creating
null-terminated objects.
 		2015-07-06 17:29:27 +01:00
..
argcheck.c py: Add %q format support to mp_[v]printf, and use it. 2015-04-16 14:30:16 +00:00
asmarm.c py: Implement native multiply operation in viper emitter. 2015-06-04 14:00:29 +00:00
asmarm.h py: Implement native multiply operation in viper emitter. 2015-06-04 14:00:29 +00:00
asmthumb.c py: Implement full func arg passing for native emitter. 2015-04-07 22:43:28 +01:00
asmthumb.h py: Implement full func arg passing for native emitter. 2015-04-07 22:43:28 +01:00
asmx64.c py: Implement native multiply operation in viper emitter. 2015-06-04 14:00:29 +00:00
asmx64.h py: Implement native multiply operation in viper emitter. 2015-06-04 14:00:29 +00:00
asmx86.c py: Implement native multiply operation in viper emitter. 2015-06-04 14:00:29 +00:00
asmx86.h py: Implement native multiply operation in viper emitter. 2015-06-04 14:00:29 +00:00
bc.c py: Add %q format support to mp_[v]printf, and use it. 2015-04-16 14:30:16 +00:00
bc.h vm: Initial support for calling bytecode functions w/o C stack ("stackless"). 2015-04-03 00:03:07 +03:00
bc0.h py: Remove mp_load_const_bytes and instead load precreated bytes object. 2015-06-25 14:42:13 +00:00
binary.c py/binary: Make return type of mp_binary_get_size size_t instead of int. 2015-05-17 18:12:19 +01:00
binary.h py/binary: Make return type of mp_binary_get_size size_t instead of int. 2015-05-17 18:12:19 +01:00
builtin.h modstruct: Rename module to "ustruct", to allow full Python-level impl. 2015-05-04 16:53:52 +03:00
builtinevex.c py: Check for valid file when creating lexer for execfile. 2015-02-15 00:02:27 +00:00
builtinimport.c builtinimport: Fix running package submodule with -m. 2015-06-29 00:26:45 +03:00
compile.c py: Remove mp_load_const_bytes and instead load precreated bytes object. 2015-06-25 14:42:13 +00:00
compile.h py: Protect mp_parse and mp_compile with nlr push/pop block. 2015-02-07 18:33:58 +00:00
emit.h py: Remove mp_load_const_bytes and instead load precreated bytes object. 2015-06-25 14:42:13 +00:00
emitbc.c py: Remove mp_load_const_bytes and instead load precreated bytes object. 2015-06-25 14:42:13 +00:00
emitcommon.c py, compiler: Refactor load/store/delete_id logic to reduce code size. 2015-03-26 16:52:45 +00:00
emitcpy.c py: Remove mp_load_const_bytes and instead load precreated bytes object. 2015-06-25 14:42:13 +00:00
emitglue.c py: Implement full func arg passing for native emitter. 2015-04-07 22:43:28 +01:00
emitglue.h py: Implement full func arg passing for native emitter. 2015-04-07 22:43:28 +01:00
emitinlinethumb.c py/inlinethumb: Support for core floating point instructions. 2015-04-19 15:47:05 +01:00
emitnative.c py: Remove mp_load_const_bytes and instead load precreated bytes object. 2015-06-25 14:42:13 +00:00
formatfloat.c py: Implement mp_format_float for doubles and use where appropriate 2015-05-17 21:47:11 +01:00
formatfloat.h py: Implement mp_format_float for doubles and use where appropriate 2015-05-17 21:47:11 +01:00
frozenmod.c frozenmod: Include header with function prototypes. 2015-05-31 23:02:04 +03:00
frozenmod.h py: Implement very simple frozen modules support. 2015-01-20 11:52:12 +02:00
gc.c py: Convert occurrences of non-debug printf to mp_printf. 2015-04-16 14:30:16 +00:00
gc.h py: Put all global state together in state structures. 2015-01-07 20:33:00 +00:00
grammar.h py: Clean up some bits and pieces in parser, grammar. 2015-04-21 16:43:18 +00:00
lexer.c py: Cast argument for printf to int, to be compatible with more ports. 2015-06-22 17:40:12 +01:00
lexer.h unix: Allow to cat a script into stdin from the command line. 2015-06-04 23:42:45 +01:00
lexerstr.c py: Use m_{new,renew,del} consistently. 2015-02-27 09:34:51 +00:00
lexerunix.c unix: Allow to cat a script into stdin from the command line. 2015-06-04 23:42:45 +01:00
makeqstrdata.py py: Get makeqstrdata.py and makeversionhdr.py running under Python 2.6. 2015-05-30 23:11:16 +01:00
makeversionhdr.py py: Get makeqstrdata.py and makeversionhdr.py running under Python 2.6. 2015-05-30 23:11:16 +01:00
malloc.c py: Add MICROPY_MALLOC_USES_ALLOCATED_SIZE to allow simpler malloc API. 2015-03-03 21:23:13 +00:00
map.c py: Convert hash API to use MP_UNARY_OP_HASH instead of ad-hoc function. 2015-05-12 22:46:02 +01:00
misc.h extmod: Add ubinascii.unhexlify 2015-05-20 09:29:22 +01:00
mkenv.mk py, mk: Revert change where build variables set with ?=. 2014-06-07 13:14:45 +01:00
mkrules.mk mkrules.mk: Add comment why dependency parsing regex was tweaked. 2015-05-06 15:34:33 +03:00
modarray.c py: Move to guarded includes, everywhere in py/ core. 2015-01-01 20:32:09 +00:00
modbuiltins.c py: Add MP_BINARY_OP_DIVMOD to simplify and consolidate divmod builtin. 2015-06-13 23:36:30 +01:00
modcmath.c py: Fix cmath.log10; fix printing of complex number with negative imag. 2015-02-02 12:52:14 +00:00
modcollections.c py: Implement core of OrderedDict type. 2015-03-20 17:26:10 +00:00
modgc.c py: Put mp_sys_path, mp_sys_argv and gc_collected in mp_state_ctx_t. 2015-02-07 17:24:10 +00:00
modio.c py: Use TextIOWrapper only if PY_IO_FILEIO def'd; cast size_t for print. 2015-02-15 13:17:11 +00:00
modmath.c py: Implement second arg for math.log (optional value for base). 2015-06-13 22:35:25 +01:00
modmicropython.c py: Convert occurrences of non-debug printf to mp_printf. 2015-04-16 14:30:16 +00:00
modstruct.c modstruct: Raise NotImplementedError for unsupported repeat specification. 2015-07-05 22:44:14 +03:00
modsys.c py: Replace py-version.sh with makeversionhdr.py, written in Python. 2015-04-28 23:52:36 +01:00
mpconfig.h py: Add TimeoutError exception subclassed from OSError. 2015-07-02 11:53:08 +02:00
mpprint.c py: Remove unnecessary extra handling of padding of nan/inf. 2015-05-28 14:22:12 +00:00
mpprint.h py: Remove unnecessary extra handling of padding of nan/inf. 2015-05-28 14:22:12 +00:00
mpstate.c py: Put all global state together in state structures. 2015-01-07 20:33:00 +00:00
mpstate.h modsys: Add basic sys.exc_info() implementation. 2015-04-25 03:49:23 +03:00
mpz.c py: Fix handling of negative numbers in struct.pack of q/Q. 2015-04-25 23:51:14 +01:00
mpz.h py: Support conversion of bignum to bytes. 2015-04-25 23:16:39 +01:00
nativeglue.c py: Remove mp_load_const_bytes and instead load precreated bytes object. 2015-06-25 14:42:13 +00:00
nlr.h py: Guard against redef of nlr_push with DEBUG + MICROPY_NLR_SETJMP. 2015-03-03 14:34:40 +00:00
nlrsetjmp.c py: Put all global state together in state structures. 2015-01-07 20:33:00 +00:00
nlrthumb.S py: Put all global state together in state structures. 2015-01-07 20:33:00 +00:00
nlrx64.S py: Fix nlr mp_state_ctx symbol error for Mac. 2015-01-08 16:24:44 +00:00
nlrx86.S py: Put all global state together in state structures. 2015-01-07 20:33:00 +00:00
nlrxtensa.S py: Put all global state together in state structures. 2015-01-07 20:33:00 +00:00
obj.c py: Add mp_obj_get_int_truncated and use it where appropriate. 2015-05-12 23:05:53 +01:00
obj.h py: Add TimeoutError exception subclassed from OSError. 2015-07-02 11:53:08 +02:00
objarray.c py/objarray.c: Allow to build with debugging and bytearray but no array. 2015-07-02 16:26:57 +01:00
objattrtuple.c py: Fix attrtuple array length in print and creation. 2015-04-29 00:17:48 +01:00
objbool.c py: Convert hash API to use MP_UNARY_OP_HASH instead of ad-hoc function. 2015-05-12 22:46:02 +01:00
objboundmeth.c py: Overhaul and simplify printf/pfenv mechanism. 2015-04-16 14:30:16 +00:00
objcell.c py: Overhaul and simplify printf/pfenv mechanism. 2015-04-16 14:30:16 +00:00
objclosure.c py: Overhaul and simplify printf/pfenv mechanism. 2015-04-16 14:30:16 +00:00
objcomplex.c py: Implement mp_format_float for doubles and use where appropriate 2015-05-17 21:47:11 +01:00
objdict.c py: Add %q format support to mp_[v]printf, and use it. 2015-04-16 14:30:16 +00:00
objenumerate.c py: Add MICROPY_PY_BUILTINS_ENUMERATE, disable for minimal ports. 2015-04-06 23:51:29 +03:00
objexcept.c py: Add TimeoutError exception subclassed from OSError. 2015-07-02 11:53:08 +02:00
objexcept.h py: Fix adding of traceback so that it appends to existing info. 2015-02-27 00:36:39 +00:00
objfilter.c py: Use mp_arg_check_num in some _make_new functions. 2015-01-20 14:11:27 +00:00
objfloat.c py: Add MP_BINARY_OP_DIVMOD to simplify and consolidate divmod builtin. 2015-06-13 23:36:30 +01:00
objfun.c py: Fallback to stack alloca for Python-stack if heap alloc fails. 2015-06-08 22:07:27 +01:00
objfun.h py: Move to guarded includes, everywhere in py/ core. 2015-01-01 20:32:09 +00:00
objgenerator.c objgenerator: Can optimize StopIteration to STOP_ITERATION only if arg is None. 2015-05-11 23:57:42 +01:00
objgenerator.h py: Move to guarded includes, everywhere in py/ core. 2015-01-01 20:32:09 +00:00
objgetitemiter.c py: Some trivial cosmetic changes, for code style consistency. 2015-04-04 15:53:11 +01:00
objint.c py: Convert hash API to use MP_UNARY_OP_HASH instead of ad-hoc function. 2015-05-12 22:46:02 +01:00
objint.h py: Support conversion of bignum to bytes. 2015-04-25 23:16:39 +01:00
objint_longlong.c py: Convert hash API to use MP_UNARY_OP_HASH instead of ad-hoc function. 2015-05-12 22:46:02 +01:00
objint_mpz.c py: Implement divmod for mpz bignum. 2015-06-13 23:38:28 +01:00
objlist.c py: Overhaul and simplify printf/pfenv mechanism. 2015-04-16 14:30:16 +00:00
objlist.h py: Fix adding of traceback so that it appends to existing info. 2015-02-27 00:36:39 +00:00
objmap.c py: Use mp_arg_check_num in some _make_new functions. 2015-01-20 14:11:27 +00:00
objmodule.c modstruct: Rename module to "ustruct", to allow full Python-level impl. 2015-05-04 16:53:52 +03:00
objmodule.h py: Move to guarded includes, everywhere in py/ core. 2015-01-01 20:32:09 +00:00
objnamedtuple.c py: Add attrtuple object, for space-efficient tuples with attr access. 2015-04-21 14:14:24 +00:00
objnone.c py: Convert hash API to use MP_UNARY_OP_HASH instead of ad-hoc function. 2015-05-12 22:46:02 +01:00
objobject.c py/objobject: Don't make locals_dict if there's nothing to go in it. 2015-05-17 17:48:47 +01:00
objproperty.c py, unix: Allow to compile with -Wunused-parameter. 2015-01-20 12:47:20 +00:00
objrange.c py: Overhaul and simplify printf/pfenv mechanism. 2015-04-16 14:30:16 +00:00
objreversed.c py: Add MICROPY_PY_BUILTINS_REVERSED, disable for minimal ports. 2015-04-07 00:17:11 +03:00
objset.c py: Overhaul and simplify printf/pfenv mechanism. 2015-04-16 14:30:16 +00:00
objsingleton.c objsingleton: New home for Ellipsis and NotImplemented. 2015-05-05 22:18:07 +03:00
objslice.c objsingleton: New home for Ellipsis and NotImplemented. 2015-05-05 22:18:07 +03:00
objstr.c py: Prevent many extra vstr allocations. 2015-07-06 17:29:27 +01:00
objstr.h py: Overhaul and simplify printf/pfenv mechanism. 2015-04-16 14:30:16 +00:00
objstringio.c py: Overhaul and simplify printf/pfenv mechanism. 2015-04-16 14:30:16 +00:00
objstrunicode.c py: Clean up declarations of str type/funcs that are also in unicode. 2015-05-17 16:44:24 +01:00
objtuple.c py: Convert hash API to use MP_UNARY_OP_HASH instead of ad-hoc function. 2015-05-12 22:46:02 +01:00
objtuple.h py: Add attrtuple object, for space-efficient tuples with attr access. 2015-04-21 14:14:24 +00:00
objtype.c py: Add MP_BINARY_OP_DIVMOD to simplify and consolidate divmod builtin. 2015-06-13 23:36:30 +01:00
objtype.h py: Check that arg to object.__new__ is a user-defined type. 2015-05-04 11:08:40 +01:00
objzip.c py, unix: Allow to compile with -Wunused-parameter. 2015-01-20 12:47:20 +00:00
opmethods.c py: Move to guarded includes, everywhere in py/ core. 2015-01-01 20:32:09 +00:00
parse.c py: Clean up some bits and pieces in parser, grammar. 2015-04-21 16:43:18 +00:00
parse.h py: Expose compile.c:list_get as mp_parse_node_extract_list. 2015-02-13 02:29:46 +00:00
parsenum.c py: Clarify comment in parsenum.c about ValueError vs SyntaxError. 2015-06-23 16:08:51 +00:00
parsenum.h py: Parse big-int/float/imag constants directly in parser. 2015-02-08 01:57:40 +00:00
parsenumbase.c py: Parse big-int/float/imag constants directly in parser. 2015-02-08 01:57:40 +00:00
parsenumbase.h py: Move to guarded includes, everywhere in py/ core. 2015-01-01 20:32:09 +00:00
py.mk py: Rebuild port if mpconfigport.mk changed (if any). 2015-06-11 11:08:39 +03:00
qstr.c py: Convert occurrences of non-debug printf to mp_printf. 2015-04-16 14:30:16 +00:00
qstr.h py: Adjust some spaces in code style/format, purely for consistency. 2015-04-09 15:29:54 +00:00
qstrdefs.h extmod: Add a2b_base64 and b2a_base64 functions to ubinascii. 2015-07-04 12:26:52 +03:00
repl.c py/repl: Fix case where shorter names are shadowed by longer names. 2015-07-06 14:00:09 +01:00
repl.h py, readline: Add tab autocompletion for REPL. 2015-04-29 00:46:26 +01:00
runtime.c runtime: Improve mp_import_name() debug logging. 2015-06-27 00:40:21 +03:00
runtime.h py: Remove mp_load_const_bytes and instead load precreated bytes object. 2015-06-25 14:42:13 +00:00
runtime0.h py: Remove mp_load_const_bytes and instead load precreated bytes object. 2015-06-25 14:42:13 +00:00
scope.c py: Move to guarded includes, everywhere in py/ core. 2015-01-01 20:32:09 +00:00
scope.h py: Move to guarded includes, everywhere in py/ core. 2015-01-01 20:32:09 +00:00
sequence.c py, unix: Allow to compile with -Wunused-parameter. 2015-01-20 12:47:20 +00:00
showbc.c py: Remove mp_load_const_bytes and instead load precreated bytes object. 2015-06-25 14:42:13 +00:00
smallint.c py: Move to guarded includes, everywhere in py/ core. 2015-01-01 20:32:09 +00:00
smallint.h py: Allow configurable object representation, with 2 different options. 2015-04-03 14:11:13 +01:00
stackctrl.c vm: Support strict stackless mode, with proper exception reporting. 2015-04-03 00:26:47 +03:00
stackctrl.h py: Move to guarded includes, everywhere in py/ core. 2015-01-01 20:32:09 +00:00
stream.c py: Add mp_obj_get_int_truncated and use it where appropriate. 2015-05-12 23:05:53 +01:00
stream.h py: Move to guarded includes, everywhere in py/ core. 2015-01-01 20:32:09 +00:00
unicode.c py: Minor improvement to unichar_isxdigit 2015-05-20 09:31:22 +01:00
unicode.h py: Move to guarded includes, everywhere in py/ core. 2015-01-01 20:32:09 +00:00
vm.c py: Remove mp_load_const_bytes and instead load precreated bytes object. 2015-06-25 14:42:13 +00:00
vmentrytable.h py: Remove mp_load_const_bytes and instead load precreated bytes object. 2015-06-25 14:42:13 +00:00
vstr.c py: Prevent many extra vstr allocations. 2015-07-06 17:29:27 +01:00
warning.c py: Convert occurrences of non-debug printf to mp_printf. 2015-04-16 14:30:16 +00:00