Commit Graph

385 Commits

Author SHA1 Message Date
Damien George 12ce9f2689 py/compile: Fix handling of unwinding BaseException in async with.
All exceptions that unwind through the async-with must be caught and
BaseException is the top-level class, which includes Exception and others.

Fixes issue #4552.
2019-02-26 23:52:10 +11:00
Damien George 4ee2c2a4cd py: Eliminate warnings about unused arguments when debugging disabled. 2019-02-25 14:52:36 +11:00
Damien George eee1e8841a py: Downcase all MP_OBJ_IS_xxx macros to make a more consistent C API.
These macros could in principle be (inline) functions so it makes sense to
have them lower case, to match the other C API functions.

The remaining macros that are upper case are:
- MP_OBJ_TO_PTR, MP_OBJ_FROM_PTR
- MP_OBJ_NEW_SMALL_INT, MP_OBJ_SMALL_INT_VALUE
- MP_OBJ_NEW_QSTR, MP_OBJ_QSTR_VALUE
- MP_OBJ_FUN_MAKE_SIG
- MP_DECLARE_CONST_xxx
- MP_DEFINE_CONST_xxx

These must remain macros because they are used when defining const data (at
least, MP_OBJ_NEW_SMALL_INT is so it makes sense to have
MP_OBJ_SMALL_INT_VALUE also a macro).

For those macros that have been made lower case, compatibility macros are
provided for the old names so that users do not need to change their code
immediately.
2019-02-12 14:54:51 +11:00
Damien George deb67569ff py/compile: Swap order of pop_block/pop_except in "except as" handler.
To make the try-finally block self contained.
2019-01-27 14:09:44 +11:00
Damien George e328a5d469 py/scope: Optimise scope_find_or_add_id to not need "added" arg.
Taking the address of a local variable is mildly expensive, in code size
and stack usage.  So optimise scope_find_or_add_id() to not need to take a
pointer to the "added" variable, and instead take the kind to use for newly
added identifiers.
2018-10-28 00:38:18 +11:00
Damien George ba92c79841 py/compile: Remove unneeded variable from global/nonlocal stmt helpers. 2018-10-28 00:38:18 +11:00
Damien George 9201f46cc8 py/compile: Fix case of eager implicit conversion of local to nonlocal.
This ensures that implicit variables are only converted to implicit
closed-over variables (nonlocals) at the very end of the function scope.
If variables are closed-over when first used (read from, as was done prior
to this commit) then this can be incorrect because the variable may be
assigned to later on in the function which means they are just a plain
local, not closed over.

Fixes issue #4272.
2018-10-28 00:33:08 +11:00
Damien George cc2bd63c57 py/emitnative: Implement yield and yield-from in native emitter.
This commit adds first class support for yield and yield-from in the native
emitter, including send and throw support, and yields enclosed in exception
handlers (which requires pulling down the NLR stack before yielding, then
rebuilding it when resuming).

This has been fully tested and is working on unix x86 and x86-64, and
stm32.  Also basic tests have been done with the esp8266 port.  Performance
of existing native code is unchanged.
2018-10-01 13:31:11 +10:00
Damien George 7d4b6cc868 py/emitnative: Place const objs for native code in separate const table.
This commit changes native code to handle constant objects like bytecode:
instead of storing the pointers inside the native code they are now stored
in a separate constant table (such pointers include objects like bignum,
bytes, and raw code for nested functions).  This removes the need for the
GC to scan native code for root pointers, and takes a step towards making
native code independent of the runtime (eg so it can be compiled offline by
mpy-cross).

Note that the changes to the struct scope_t did not increase its size: on a
32-bit architecture it is still 48 bytes, and on a 64-bit architecture it
decreased from 80 to 72 bytes.
2018-09-27 23:39:08 +10:00
Damien George b01f66c5f1 py: Shorten error messages by using contractions and some rewording. 2018-09-20 14:33:10 +10:00
Damien George 93d71c5436 py/emitnative: Make viper funcs run with their correct globals context.
Viper functions will now capture the globals at the point they were defined
and use these globals when executing.
2018-09-15 22:39:27 +10:00
Damien George 43f1848bfa py: Make viper functions have the same entry signature as native.
This commit makes viper functions have the same signature as native
functions, at the level of the emitter/assembler.  This means that viper
functions can now be wrapped in the same uPy object as native functions.

Viper functions are now responsible for parsing their arguments (before it
was done by the runtime), and this makes calling them more efficient (in
most cases) because the viper entry code can be custom generated to suit
the signature of the function.

This change also opens the way forward for viper functions to take
arbitrary numbers of arguments, and for them to handle globals correctly,
among other things.
2018-09-15 22:39:27 +10:00
Damien George 9f2067288a py/compile: Factor code that compiles viper type annotations. 2018-09-15 13:44:39 +10:00
Damien George a169a5848c py/compile: Merge viper annotation and normal param compilation stages.
Now that the compiler can store the results of the viper types in the
scope, the viper parameter annotation compilation stage can be merged with
the normal parameter compilation stage.
2018-09-15 13:20:54 +10:00
Damien George 80db30a510 py/emit: Completely remove set_native_type, arg type is set in compiler.
In viper mode, the type of the argument is now stored in id_info->flags.
2018-09-15 13:00:11 +10:00
Damien George 07caf4f969 py/emit: Remove need to call set_native_type to set viper return type.
Instead this return type is now stored in the scope_flags.
2018-09-15 12:41:25 +10:00
Damien George 1d7c221b30 py/emit: Remove need to call set_native_type to set native/viper mode.
The native emitter can easily determine the mode via scope->emit_options.
2018-09-15 12:17:14 +10:00
Damien George 4f3d9429b5 py: Fix native functions so they run with their correct globals context.
Prior to this commit a function compiled with the native decorator
@micropython.native would not work correctly when accessing global
variables, because the globals dict was not being set upon function entry.

This commit fixes this problem by, upon function entry, setting as the
current globals dict the globals dict context the function was defined
within, as per normal Python semantics, and as bytecode does.  Upon
function exit the original globals dict is restored.

In order to restore the globals dict when an exception is raised the native
function must guard its internals with an nlr_push/nlr_pop pair.  Because
this push/pop is relatively expensive, in both C stack usage for the
nlr_buf_t and CPU execution time, the implementation here optimises things
as much as possible.  First, the compiler keeps track of whether a function
even needs to access global variables.  Using this information the native
emitter then generates three different kinds of code:

1. no globals used, no exception handlers: no nlr handling code and no
   setting of the globals dict.

2. globals used, no exception handlers: an nlr_buf_t is allocated on the
   C stack but it is not used if the globals dict is unchanged, saving
   execution time because nlr_push/nlr_pop don't need to run.

3. function has exception handlers, may use globals: an nlr_buf_t is
   allocated and nlr_push/nlr_pop are always called.

In the end, native functions that don't access globals and don't have
exception handlers will run more efficiently than those that do.

Fixes issue #1573.
2018-09-13 22:47:20 +10:00
Damien George 8014e7f15f py/compile: Factor code that compiles start/end of exception handler. 2018-09-04 16:06:22 +10:00
Damien George 4ae7111573 py/emitnative: Add support for return/break/continue in try and with.
This patch adds full support for unwinding jumps to the native emitter.
This means that return/break/continue can be used in try-except,
try-finally and with statements.  For code that doesn't use unwinding jumps
there is almost no overhead added to the generated code.
2018-09-04 14:31:28 +10:00
Damien George a3de776486 py/emitnative: Optimise and improve exception handling in native code.
Prior to this patch, native code would use a full nlr_buf_t for each
exception handler (try-except, try-finally, with).  For nested exception
handlers this would use a lot of C stack and be rather inefficient.

This patch changes how exceptions are handled in native code by setting up
only a single nlr_buf_t context for the entire function, and then manages a
state machine (using the PC) to work out which exception handler to run
when an exception is raised by an nlr_jump.  This keeps the C stack usage
at a constant level regardless of the depth of Python exception blocks.

The patch also fixes an existing bug when local variables are written to
within an exception handler, then their value was incorrectly restored if
an exception was raised (since the nlr_jump would restore register values,
back to the point of the nlr_push).

And it also gets nested try-finally+with working with the viper emitter.

Broadly speaking, efficiency of executing native code that doesn't use
any exception blocks is unchanged, and emitted code size is only slightly
increased for such function.  C stack usage of all native functions is
either equal or less than before.  Emitted code size for native functions
that use exception blocks is increased by roughly 10% (due in part to
fixing of above-mentioned bugs).

But, most importantly, this patch allows to implement more Python features
in native code, like unwind jumps and yielding from within nested exception
blocks.
2018-08-16 13:56:36 +10:00
Damien George cbec17f2cd py/compile: For dynamic compiler, widen literal 1 to get correct shift.
Without this patch, on 64-bit architectures the "1 << (small_int_bits - 1)"
is computed using only 32-bit values (since small_int_bits is a uint8_t)
and so will overflow (and give the wrong result) if small_int_bits is
larger than 32.
2018-08-13 23:34:47 +10:00
Damien George d8dc918deb py/compile: Handle return/break/continue correctly in async with.
Before this patch the context manager's __aexit__() method would not be
executed if a return/break/continue statement was used to exit an async
with block.  async with now has the same semantics as normal with.

The fix here applies purely to the compiler, and does not modify the
runtime at all. It might (eventually) be better to define new bytecode(s)
to handle async with (and maybe other async constructs) in a cleaner, more
efficient way.

One minor drawback with addressing this issue purely in the compiler is
that it wasn't possible to get 100% CPython semantics.  The thing that is
different here to CPython is that the __aexit__ method is not looked up in
the context manager until it is needed, which is after the body of the
async with statement has executed.  So if a context manager doesn't have
__aexit__ then CPython raises an exception before the async with is
executed, whereas uPy will raise it after it is executed.  Note that
__aenter__ is looked up at the beginning in uPy because it needs to be
called straightaway, so if the context manager isn't a context manager then
it'll still raise an exception at the same location as CPython.  The only
difference is if the context manager has the __aenter__ method but not the
__aexit__ method, then in that case uPy has different behaviour.  But this
is a very minor, and acceptable, difference.
2018-06-27 16:57:42 +10:00
Damien George 25ae98f07c py/compile: Combine expr, xor_expr and and_expr into one function.
This and the previous 4 commits combined have change in code size of:

   bare-arm:   -92
minimal x86:  -544
   unix x64:  -544
unix nanbox:  -712
      stm32:  -116
     cc3200:  -128
    esp8266:  -348
      esp32:  -232
2018-06-22 17:00:29 +10:00
Damien George 36e474e83f py/compile: Combine or_test and and_test compile functions. 2018-06-22 17:00:29 +10:00
Damien George 1a7109d65a py/compile: Combine global and nonlocal statement compile functions. 2018-06-22 17:00:29 +10:00
Damien George d23bec3fc8 py/compile: Combine subscript_2 and subscript_3 into one function. 2018-06-22 17:00:29 +10:00
Damien George c149197928 py/compile: Combine break and continue compile functions. 2018-06-22 17:00:29 +10:00
Damien George 18e6358480 py/emit: Combine setup with/except/finally into one emit function.
This patch reduces code size by:

   bare-arm:   -16
minimal x86:  -156
   unix x64:  -288
unix nanbox:  -184
      stm32:   -48
     cc3200:   -16
    esp8266:   -96
      esp32:   -16

The last 10 patches combined reduce code size by:

   bare-arm:  -164
minimal x86: -1260
   unix x64: -3416
unix nanbox: -1616
      stm32:  -676
     cc3200:  -232
    esp8266: -1144
      esp32:  -268
2018-05-23 00:35:16 +10:00
Damien George 436e0d4c54 py/emit: Merge build set/slice into existing build emit function.
Reduces code size by:

   bare-arm:    +0
minimal x86:    +0
   unix x64:  -368
unix nanbox:  -248
      stm32:  -128
     cc3200:   -48
    esp8266:  -184
      esp32:   -40
2018-05-23 00:23:36 +10:00
Damien George d97906ca9a py/emit: Combine import from/name/star into one emit function.
Change in code size is:

   bare-arm:    +4
minimal x86:   -88
   unix x64:  -456
unix nanbox:   -88
      stm32:   -44
     cc3200:    +0
    esp8266:  -104
      esp32:    +8
2018-05-23 00:23:08 +10:00
Damien George 8a513da5a5 py/emit: Combine break_loop and continue_loop into one emit function.
Reduces code size by:

   bare-arm:    +0
minimal x86:    +0
   unix x64:   -80
unix nanbox:    +0
      stm32:   -12
     cc3200:    +0
    esp8266:   -28
      esp32:    +0
2018-05-23 00:23:04 +10:00
Damien George 6211d979ee py/emit: Combine load/store/delete attr into one emit function.
Reduces code size by:

   bare-arm:   -20
minimal x86:  -140
   unix x64:  -408
unix nanbox:  -140
      stm32:   -68
     cc3200:   -16
    esp8266:   -80
      esp32:   -32
2018-05-23 00:22:59 +10:00
Damien George a4941a8ba4 py/emit: Combine load/store/delete subscr into one emit function.
Reduces code size by:

   bare-arm:    -8
minimal x86:  -104
   unix x64:  -312
unix nanbox:  -120
      stm32:   -60
     cc3200:   -16
    esp8266:   -92
      esp32:   -24
2018-05-23 00:22:55 +10:00
Damien George d298013939 py/emit: Combine name and global into one func for load/store/delete.
Reduces code size by:

   bare-arm:   -56
minimal x86:  -300
   unix x64:  -576
unix nanbox:  -300
      stm32:  -164
     cc3200:   -56
    esp8266:  -236
      esp32:   -76
2018-05-23 00:22:47 +10:00
Damien George 26b5754092 py/emit: Combine build tuple/list/map emit funcs into one.
Reduces code size by:

   bare-arm:   -24
minimal x86:  -192
   unix x64:  -288
unix nanbox:  -184
      stm32:   -72
     cc3200:   -16
    esp8266:  -148
      esp32:   -32
2018-05-23 00:22:44 +10:00
Damien George e686c94052 py/emit: Combine yield value and yield-from emit funcs into one.
Reduces code size by:

   bare-arm:   -24
minimal x86:   -72
   unix x64:  -200
unix nanbox:   -72
      stm32:   -52
     cc3200:   -32
    esp8266:   -84
      esp32:   -24
2018-05-23 00:22:35 +10:00
Damien George 0a25fff956 py/emit: Combine fast and deref into one function for load/store/delete.
Reduces code size by:

   bare-arm:   -16
minimal x86:  -208
   unix x64:  -408
unix nanbox:  -248
      stm32:   -12
     cc3200:   -24
    esp8266:   -96
      esp32:   -44
2018-05-23 00:22:20 +10:00
Damien George 828ce16dc8 py/compile: Change comment about ITER_BUF_NSLOTS to a static assertion. 2018-05-18 23:31:00 +10:00
Damien George 7dfa56e40e py/compile: Adjust c_assign_atom_expr() to use return instead of goto.
Makes the flow of the function a little more obvious, and allows to reach
100% coverage of compile.c when using gcov.
2018-02-24 23:03:17 +11:00
Damien George 253f2bd7be py/compile: Combine compiler-opt of 2 and 3 tuple-to-tuple assignment.
This patch combines the compiler optimisation code for double and triple
tuple-to-tuple assignment, taking it from two separate if-blocks to one
combined if-block.  This can be done because the code for both of these
optimisations has a lot in common.  Combining them together reduces code
size for ports that have the triple-tuple optimisation enabled (and doesn't
change code size for ports that have it disabled).
2018-02-04 13:35:21 +11:00
Damien George 1e5a33df41 py: Convert all uses of alloca() to use new scoped allocation API. 2017-12-11 13:49:09 +11:00
Damien George 487dbdb267 py/compile: Use alloca instead of qstr_build when compiling import name.
The technique of using alloca is how dotted import names are composed in
mp_import_from and mp_builtin___import__, so use the same technique in the
compiler.  This puts less pressure on the heap (only the stack is used if
the qstr already exists, and if it doesn't exist then the standard qstr
block memory is used for the new qstr rather than a separate chunk of the
heap) and reduces overall code size.
2017-11-01 13:16:16 +11:00
Damien George ad6aae13a4 py/compile: Remove unused pn_colon code when compiling func params. 2017-08-21 22:00:34 +10:00
Alexander Steffen 55f33240f3 all: Use the name MicroPython consistently in comments
There were several different spellings of MicroPython present in comments,
when there should be only one.
2017-07-31 18:35:40 +10:00
Damien George 0291a624cb py/compile: Fix enum variable declaration. 2017-07-09 13:18:14 +10:00
Krzysztof Blazewicz 91a385db98 py/compile: Use switch-case to match token and operator.
Reduces code size.
2017-07-05 15:50:36 +10:00
Krzysztof Blazewicz a040fb89e7 py/compile: Combine arith and bit-shift ops into 1 compile routine.
This refactoring saves code space.
2017-07-05 15:49:00 +10:00
Damien George d94bc675e8 py/compile: Optimise emitter label indices to save a word of heap.
Previous to this patch, a label with value "0" was used to indicate an
invalid label, but that meant a wasted word (at slot 0) in the array of
label offsets.  This patch adjusts the label indices so the first one
starts at 0, and the maximum value indicates an invalid label.
2017-06-22 15:05:58 +10:00
Damien George 4c5f108321 py/compile: Fix bug with break/continue in else of optimised for-range.
This patch fixes a bug whereby the Python stack was not correctly reset if
there was a break/continue statement in the else black of an optimised
for-range loop.

For example, in the following code the "j" variable from the inner for loop
was not being popped off the Python stack:

    for i in range(4):
        for j in range(4):
            pass
        else:
            continue

This is now fixed with this patch.
2017-06-22 13:50:33 +10:00
Damien George 1e70fda69f py/compile: Raise SyntaxError if positional args are given after */**.
In CPython 3.4 this raises a SyntaxError.  In CPython 3.5+ having a
positional after * is allowed but uPy has the wrong semantics and passes
the arguments in the incorrect order.  To prevent incorrect use of a
function going unnoticed it is important to raise the SyntaxError in uPy,
until the behaviour is fixed to follow CPython 3.5+.
2017-06-14 18:18:01 +10:00
Ville Skyttä ca16c38210 various: Spelling fixes 2017-05-29 11:36:05 +03:00
Damien George dd11af209d py: Add LOAD_SUPER_METHOD bytecode to allow heap-free super meth calls.
This patch allows the following code to run without allocating on the heap:

    super().foo(...)

Before this patch such a call would allocate a super object on the heap and
then load the foo method and call it right away.  The super object is only
needed to perform the lookup of the method and not needed after that.  This
patch makes an optimisation to allocate the super object on the C stack and
discard it right after use.

Changes in code size due to this patch are:

   bare-arm: +128
    minimal: +232
   unix x64: +416
unix nanbox: +364
     stmhal: +184
    esp8266: +340
     cc3200: +128
2017-04-22 23:39:20 +10:00
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 0dd6a59c89 py/compile: Don't do unnecessary check if iter parse node is a struct.
If we get to this point in the code then pn_iter is guaranteed to be a
struct.
2017-04-22 21:43:42 +10:00
Damien George ae54fbf166 py/compile: Add COMP_RETURN_IF_EXPR option to enable return-if-else opt.
With this optimisation enabled the compiler optimises the if-else
expression within a return statement.  The optimisation reduces bytecode
size by 2 bytes for each use of such a return-if-else statement.  Since
such a statement is not often used, and costs bytes for the code, the
feature is disabled by default.

For example the following code:

    def f(x):
        return 1 if x else 2

compiles to this bytecode with the optimisation disabled (left column is
bytecode offset in bytes):

    00 LOAD_FAST 0
    01 POP_JUMP_IF_FALSE 8
    04 LOAD_CONST_SMALL_INT 1
    05 JUMP 9
    08 LOAD_CONST_SMALL_INT 2
    09 RETURN_VALUE

and to this bytecode with the optimisation enabled:

    00 LOAD_FAST 0
    01 POP_JUMP_IF_FALSE 6
    04 LOAD_CONST_SMALL_INT 1
    05 RETURN_VALUE
    06 LOAD_CONST_SMALL_INT 2
    07 RETURN_VALUE

So the JUMP to RETURN_VALUE is optimised and replaced by RETURN_VALUE,
saving 2 bytes and making the code a bit faster.
2017-04-22 14:58:01 +10:00
Damien George 40b40ffc98 py/compile: Extract parse-node kind at start of func for efficiency.
Otherwise the type of parse-node and its kind has to be re-extracted
multiple times.  This optimisation reduces code size by a bit (16 bytes on
bare-arm).
2017-04-22 14:23:47 +10:00
Damien George fa03bbf0fd py/compile: Don't do unnecessary check if parse node is a struct.
PN_atom_expr_normal parse nodes always have structs for their second
sub-node, so simplify the check for the sub-node kind to save code size.
2017-04-22 14:13:37 +10:00
Damien George de9b53695d py: Raise a ValueError if range() step is zero.
Following CPython.  Otherwise one gets either an infinite loop (if code is
optimised by the uPy compiler) or possibly a divide-by-zero CPU exception.
2017-04-05 10:50:26 +10:00
Damien George f9b0e644e5 py/compile: Provide terse error message for invalid dict/set literals. 2017-03-29 12:44:27 +11:00
Damien George 18c059febf py: Shorten a couple of error messages. 2017-03-29 12:36:46 +11:00
Damien George f55a059e7a py/compile: Simplify syntax-error messages for illegal assignments.
With this patch all illegal assignments are reported as "can't assign to
expression".  Before the patch there were special cases for a literal on
the LHS, and for augmented assignments (eg +=), but it seems a waste of
bytes (and there are lots of bytes used in error messages) to spend on
distinguishing such errors which a user will rarely encounter.
2017-03-29 12:28:33 +11:00
Damien George 40c1272e55 py/compile: When compiling super(), handle closed-over self variable.
The self variable may be closed-over in the function, and in that case the
call to super() should load the contents of the closure cell using
LOAD_DEREF (before this patch it would just load the cell directly).
2017-03-27 11:27:08 +11:00
Damien George 60656eaea4 py: Define and use MP_OBJ_ITER_BUF_NSLOTS to get size of stack iter buf.
It improves readability of code and reduces the chance to make a mistake.

This patch also fixes a bug with nan-boxing builds by rounding up the
calculation of the new NSLOTS variable, giving the correct number of slots
(being 4) even if mp_obj_t is larger than the native machine size.
2017-03-23 16:36:08 +11:00
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 534b7c368d py: Do adjacent str/bytes literal concatenation in lexer, not compiler.
It's much more efficient in RAM and code size to do implicit literal string
concatenation in the lexer, as opposed to the compiler.

RAM usage is reduced because the concatenation can be done right away in the
tokeniser by just accumulating the string/bytes literals into the lexer's
vstr.  Prior to this patch adjacent strings/bytes would create a parse tree
(one node per string/bytes) and then in the compiler a whole new chunk of
memory was allocated to store the concatenated string, which used more than
double the memory compared to just accumulating in the lexer.

This patch also significantly reduces code size:

bare-arm: -204
minimal:  -204
unix x64: -328
stmhal:   -208
esp8266:  -284
cc3200:   -224
2017-02-17 12:12:40 +11:00
Damien George 71019ae4f5 py/grammar: Group no-compile grammar rules together to shrink tables.
Grammar rules have 2 variants: ones that are attached to a specific
compile function which is called to compile that grammar node, and ones
that don't have a compile function and are instead just inspected to see
what form they take.

In the compiler there is a table of all grammar rules, with each entry
having a pointer to the associated compile function.  Those rules with no
compile function have a null pointer.  There are 120 such rules, so that's
120 words of essentially wasted code space.

By grouping together the compile vs no-compile rules we can put all the
no-compile rules at the end of the list of rules, and then we don't need
to store the null pointers.  We just have a truncated table and it's
guaranteed that when indexing this table we only index the first half,
the half with populated pointers.

This patch implements such a grouping by having a specific macro for the
compile vs no-compile grammar rules (DEF_RULE vs DEF_RULE_NC).  It saves
around 460 bytes of code on 32-bit archs.
2017-02-16 19:45:06 +11:00
Damien George 4d2bab1444 py/compile: Optimise list/dict/set comprehensions to use stack iter. 2017-02-16 18:38:07 +11:00
Damien George 30b42dd72d py: Remove unused "use_stack" argument from for_iter_end emit function. 2017-02-16 18:38:06 +11:00
Damien George 088740ecc4 py: Optimise storage of iterator so it takes only 4 slots on Py stack. 2017-02-16 18:38:06 +11:00
Damien George 6e769da0da py: Make FOR_ITER opcode pop 1+4 slots from the stack when finished.
The extra 4 slots correspond to the iterator object stored on the stack.
2017-02-16 18:38:06 +11:00
Damien George f4df3aaa72 py: Allow bytecode/native to put iter_buf on stack for simple for loops.
So that the "for x in it: ..." statement can now work without using the
heap (so long as the iterator argument fits in an iter_buf structure).
2017-02-16 18:38:06 +11:00
Damien George de9cd00b39 py/compile: Add an extra pass for Xtensa inline assembler.
It needs an extra pass to compute the size of the constant table for the
l32r instructions.
2016-12-19 17:42:25 +11:00
Damien George e920bab976 py/emitinline: Move common code for end of final pass to compiler.
This patch moves some common code from the individual inline assemblers to
the compiler, the code that calls the emit-glue to assign the machine code
to the functions scope.
2016-12-09 21:23:17 +11:00
Damien George dd53b12193 py/emitinline: Move inline-asm align and data methods to compiler.
These are generic methods that don't depend on the architecture and so
can be handled directly by the compiler.
2016-12-09 20:54:54 +11:00
Damien George f76b1bfa9f py: Add inline Xtensa assembler.
This patch adds the MICROPY_EMIT_INLINE_XTENSA option, which, when
enabled, allows the @micropython.asm_xtensa decorator to be used.

The following opcodes are currently supported (ax is a register, a0-a15):

    ret_n()
    callx0(ax)
    j(label)
    jx(ax)

    beqz(ax, label)
    bnez(ax, label)
    mov(ax, ay)
    movi(ax, imm) # imm can be full 32-bit, uses l32r if needed

    and_(ax, ay, az)
    or_(ax, ay, az)
    xor(ax, ay, az)
    add(ax, ay, az)
    sub(ax, ay, az)
    mull(ax, ay, az)

    l8ui(ax, ay, imm)
    l16ui(ax, ay, imm)
    l32i(ax, ay, imm)
    s8i(ax, ay, imm)
    s16i(ax, ay, imm)
    s32i(ax, ay, imm)
    l16si(ax, ay, imm)
    addi(ax, ay, imm)

    ball(ax, ay, label)
    bany(ax, ay, label)
    bbc(ax, ay, label)
    bbs(ax, ay, label)
    beq(ax, ay, label)
    bge(ax, ay, label)
    bgeu(ax, ay, label)
    blt(ax, ay, label)
    bnall(ax, ay, label)
    bne(ax, ay, label)
    bnone(ax, ay, label)

Upon entry to the assembly function the registers a0, a12, a13, a14 are
pushed to the stack and the stack pointer (a1) decreased by 16.  Upon
exit, these registers and the stack pointer are restored, and ret.n is
executed to return to the caller (caller address is in a0).

Note that the ABI for the Xtensa emitters is non-windowing.
2016-12-09 17:07:38 +11:00
Damien George ad297a1950 py: Allow inline-assembler emitter to be generic.
This patch refactors some code so that it is easier to integrate new
inline assemblers for different architectures other than ARM Thumb.
2016-12-09 17:06:21 +11:00
Damien George 8e5aced1fd py: Integrate Xtensa assembler into native emitter.
The config option MICROPY_EMIT_XTENSA can now be enabled to target the
Xtensa architecture with @micropython.native and @micropython.viper
decorators.
2016-12-09 16:51:49 +11:00
Damien George 080a78b15e py/compile: Simplify configuration of native emitter. 2016-12-07 11:17:17 +11:00
Damien George e6cf5fb2cc py/compile: Remove comment about TODO for short circuiting for if-stmt.
Short circuiting is handled correctly by c_if_cond, and constants within
short-circuit expressions are optimised by the parser.
2016-11-26 16:15:55 +11:00
Damien George ed9c93f0f1 py/parse: Make mp_parse_node_new_leaf an inline function.
It is split into 2 functions, one to make small ints and the other to make
a non-small-int leaf node.  This reduces code size by 32 bytes on
bare-arm, 64 bytes on unix (x64-64) and 144 bytes on stmhal.
2016-11-15 16:48:48 +11:00
Damien George b0cbfb0492 py/parse: Move function to check for const parse node to parse.[ch]. 2016-11-15 16:48:48 +11:00
Damien George deaa57acf3 py/compile: Remove debugging code for compiler dispatch.
It was a relic from the days of developing the compiler and is no longer
needed, and it's impossible to trigger via a test.
2016-10-12 10:20:48 +11:00
Damien George e49153fb98 py/compile: Remove unreachable code. 2016-10-11 12:29:54 +11:00
Damien George 216a711cd4 py/compile: Fix typo when checking for parse-node kind. 2016-09-30 14:48:06 +10:00
Damien George 0d10517a45 py/scope: Factor common code to find locals and close over them.
Saves 50-100 bytes of code.
2016-09-30 13:53:00 +10:00
Damien George 3dea8c9e92 py/scope: Use lookup-table to determine a scope's simple name.
Generates slightly smaller and more efficient code.
2016-09-30 12:34:05 +10:00
Damien George b32c01b748 py/compile: Fix async-for/async-with to work with simpler exc on stack.
There is now just the exception instance on the stack when an exception is
raised, not the full (type, exc, traceback).
2016-09-28 11:52:13 +10:00
Damien George f040685b0c py: Only store the exception instance on Py stack in bytecode try block.
When an exception is raised and is to be handled by the VM, it is stored
on the Python value stack so the bytecode can access it.  CPython stores
3 objects on the stack for each exception: exc type, exc instance and
traceback.  uPy followed this approach, but it turns out not to be
necessary.  Instead, it is enough to store just the exception instance on
the Python value stack.  The only place where the 3 values are needed
explicitly is for the __exit__ handler of a with-statement context, but
for these cases the 3 values can be extracted from the single exception
instance.

This patch removes the need to store 3 values on the stack, and instead
just stores the exception instance.

Code size is reduced by about 50-100 bytes, the compiler and VM are
slightly simpler, generate bytecode is smaller (by 2 bytes for each try
block), and the Python value stack is reduced in size for functions that
handle exceptions.
2016-09-27 12:37:21 +10:00
Damien George a5624bf381 py: Combine 3 comprehension emit functions (list/dict/set) into 1.
The 3 kinds of comprehensions are similar enough that merging their emit
functions reduces code size.  Decreases in code size in bytes are:
bare-arm:24, minimal:96, unix(NDEBUG,x86-64):328, stmhal:80, esp8266:76.
2016-09-19 12:23:31 +10:00
Damien George 24df30c133 py/compile: Don't compile assert statements when optimisations enabled.
As per CPython.
2016-08-26 22:28:22 +10:00
Damien George 3ff16ff52e py: Declare constant data as properly constant.
Otherwise some compilers (eg without optimisation) will put this read-only
data in RAM instead of ROM.
2016-05-20 12:46:20 +01:00
Damien George eacbd7aeba py: Fix constant folding and inline-asm to work with new async grammar. 2016-04-13 15:26:39 +01:00
pohmelie 81ebba7e02 py: add async/await/async for/async with syntax
They are sugar for marking function as generator, "yield from"
and pep492 python "semantically equivalents" respectively.

@dpgeorge was the original author of this patch, but @pohmelie made
changes to implement `async for` and `async with`.
2016-04-13 15:26:38 +01:00
Damien George 2c915e1ae6 py: Implement basic with support in native emitter. 2016-04-07 08:53:24 +01:00
Damien George ce8b4e8749 py: Combine continuous block of emit steps into with_cleanup emit call.
Because different emitters need to handle with-cleanup in different ways.
2016-04-07 08:50:38 +01:00
Damien George 3acaa28b52 py: Don't allocate an extra parse node for power exponent.
Previous to this patch, the "**b" in "a**b" had its own parse node with
just one item (the "b").  Now, the "b" is just the last element of the
power parse-node.  This saves (a tiny bit of) RAM when compiling.
2016-03-16 13:04:51 +00:00
Damien George ea23520403 py: Add MICROPY_DYNAMIC_COMPILER option to config compiler at runtime.
This new compile-time option allows to make the bytecode compiler
configurable at runtime by setting the fields in the mp_dynamic_compiler
structure.  By using this feature, the compiler can generate bytecode
that targets any MicroPython runtime/VM, regardless of the host and
target compile-time settings.

Options so far that fall under this dynamic setting are:
- maximum number of bits that a small int can hold;
- whether caching of lookups is used in the bytecode;
- whether to use unicode strings or not (lexer behaviour differs, and
  therefore generated string constants differ).
2016-02-25 10:05:46 +00:00
Damien George 8f54c08691 py/inlineasm: Add ability to specify return type of asm_thumb funcs.
Supported return types are: object, bool, int, uint.

For example:

@micropython.asm_thumb
def foo(r0, r1) -> uint:
    add(r0, r0, r1)
2016-01-27 14:27:10 +00:00
Damien George 93b3726240 py/parse: Optimise away parse node that's just parenthesis around expr.
Before this patch, (x+y)*z would be parsed to a tree that contained a
redundant identity parse node corresponding to the parenthesis.  With
this patch such nodes are optimised away, which reduces memory
requirements for expressions with parenthesis, and simplifies the
compiler because it doesn't need to handle this identity case.

A parenthesis parse node is still needed for tuples.
2016-01-07 13:07:52 +00:00