Commit Graph

9 Commits

Author SHA1 Message Date
Damien George
c8c0fd4ca3 py: Rework and compress second part of bytecode prelude.
This patch compresses the second part of the bytecode prelude which
contains the source file name, function name, source-line-number mapping
and cell closure information.  This part of the prelude now begins with a
single varible length unsigned integer which encodes 2 numbers, being the
byte-size of the following 2 sections in the header: the "source info
section" and the "closure section".  After decoding this variable unsigned
integer it's possible to skip over one or both of these sections very
easily.

This scheme saves about 2 bytes for most functions compared to the original
format: one in the case that there are no closure cells, and one because
padding was eliminated.
2019-10-01 12:26:22 +10:00
Damien George
67fdfebe64 tests: Update tests for changes to opcode ordering. 2019-09-26 15:27:11 +10:00
Damien George
35a759dc1d tests: Add some more tests to improve coverage of py/parse.c. 2017-12-19 16:13:00 +11:00
Damien George
5335942b59 py/compile: Refactor handling of special super() call.
This patch refactors the handling of the special super() call within the
compiler.  It removes the need for a global (to the compiler) state variable
which keeps track of whether the subject of an expression is super.  The
handling of super() is now done entirely within one function, which makes
the compiler a bit cleaner and allows to easily add more optimisations to
super calls.

Changes to the code size are:

   bare-arm: +12
    minimal:  +0
   unix x64: +48
unix nanbox: -16
     stmhal:  +4
     cc3200:  +0
    esp8266: -56
2017-04-22 21:46:32 +10:00
Damien George
5255255fb9 py: Create str/bytes objects in the parser, not the compiler.
Previous to this patch any non-interned str/bytes objects would create a
special parse node that held a copy of the str/bytes data.  Then in the
compiler this data would be turned into a str/bytes object.  This actually
lead to 2 copies of the data, one in the parse node and one in the object.
The parse node's copy of the data would be freed at the end of the compile
stage but nevertheless it meant that the peak memory usage of the
parse/compile stage was higher than it needed to be (by an amount equal to
the number of bytes in all the non-interned str/bytes objects).

This patch changes the behaviour so that str/bytes objects are created
directly in the parser and the object stored in a const-object parse node
(which already exists for bignum, float and complex const objects).  This
reduces peak RAM usage of the parse/compile stage, simplifies the parser
and compiler, and reduces code size by about 170 bytes on Thumb2 archs,
and by about 300 bytes on Xtensa archs.
2017-02-24 13:43:43 +11:00
Damien George
c889f01b8d tests/cmdline/cmd_parsetree: Update to work with changes to grammar. 2017-02-17 12:29:51 +11:00
Damien George
0ec957d7c5 tests/cmdline: Update cmd_parsetree test for changes to grammar order. 2017-02-16 19:45:07 +11:00
Damien George
861b001783 tests/cmdline: Update tests to pass with latest changes to bytecode. 2017-02-16 18:38:07 +11:00
Damien George
cdec7ba30e tests: Add a coverage test for printing the parse-tree. 2016-12-22 11:26:06 +11:00