Commit Graph

111 Commits

Author SHA1 Message Date
Damien George 55830dd9bf py/objexcept: Make sure mp_obj_new_exception_msg doesn't copy/format msg
mp_obj_new_exception_msg() assumes that the message passed to it is in ROM
and so can use its data directly to create the string object for the
argument of the exception, saving RAM.  At the same time, this approach
also makes sure that there is no attempt to format the message with printf,
which could lead to faults if the message contained % characters.

Fixes issue #3004.
2018-12-10 16:01:05 +11:00
Damien George bad4e15da5 py/objexcept: Use macros to make offsets in emergency exc buf clearer. 2018-12-10 15:53:38 +11:00
Damien George 5edce4539b py/objexcept: Make MP_DEFINE_EXCEPTION public so ports can define excs. 2018-03-17 00:31:40 +11:00
Damien George 73d1d20b46 py/objexcept: Remove long-obsolete mp_const_MemoryError_obj.
This constant exception instance was once used by m_malloc_fail() to raise
a MemoryError without allocating memory, but it was made obsolete long ago
by 3556e45711.  The functionality is now
replaced by the use of mp_emergency_exception_obj which lives in the global
uPy state, and which can handle any exception type, not just MemoryError.
2018-02-15 16:50:02 +11:00
Damien George d32d22dfd7 py/objtype: Implement better support for overriding native's __init__.
This patch cleans up and generalises part of the code which handles
overriding and calling a native base-class's __init__ method.  It defers
the call to the native make_new() function until after the user (Python)
__init__() method has run.  That user method now has the chance to call the
native __init__/make_new and pass it different arguments.  If the user
doesn't call the super().__init__ method then it will be called
automatically after the user code finishes, to finalise construction of the
instance.
2017-12-12 16:43:16 +11:00
Damien George 9c02707356 py/objexcept: Use INT_FMT when printing errno value. 2017-12-11 22:38:30 +11:00
Damien George a3dc1b1957 all: Remove inclusion of internal py header files.
Header files that are considered internal to the py core and should not
normally be included directly are:
    py/nlr.h - internal nlr configuration and declarations
    py/bc0.h - contains bytecode macro definitions
    py/runtime0.h - contains basic runtime enums

Instead, the top-level header files to include are one of:
    py/obj.h - includes runtime0.h and defines everything to use the
        mp_obj_t type
    py/runtime.h - includes mpstate.h and hence nlr.h, obj.h, runtime0.h,
        and defines everything to use the general runtime support functions

Additional, specific headers (eg py/objlist.h) can be included if needed.
2017-10-04 12:37:50 +11:00
Damien George 96fd80db13 py/objexcept: Prevent infinite recursion when allocating exceptions.
The aim of this patch is to rewrite the functions that create exception
instances (mp_obj_exception_make_new and mp_obj_new_exception_msg_varg) so
that they do not call any functions that may raise an exception.  Otherwise
it's possible to create infinite recursion with an exception being raised
while trying to create an exception object.

The two main things that are done to accomplish this are:
1. Change mp_obj_new_exception_msg_varg to just format the string, then
   call mp_obj_exception_make_new to actually create the exception object.
2. In mp_obj_exception_make_new and mp_obj_new_exception_msg_varg try to
   allocate all memory first using functions that don't raise exceptions
   If any of the memory allocations fail (return NULL) then degrade
   gracefully by trying other options for memory allocation, eg using the
   emergency exception buffer.
3. Use a custom printer backend to conservatively format strings: if it
   can't allocate memory then it just truncates the string.

As part of this rewrite, raising an exception without a message, like
KeyError(123), will now use the emergency buffer to store the arg and
traceback data if there is no heap memory available.

Memory use with this patch is unchanged.  Code size is increased by:

   bare-arm:  +136
minimal x86:  +124
   unix x64:   +72
unix nanbox:   +96
      stm32:   +88
    esp8266:   +92
     cc3200:   +80
2017-09-21 15:24:57 +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 816413e4b2 py: Optimise types for common case where type has a single parent type.
The common cases for inheritance are 0 or 1 parent types, for both built-in
types (eg built-in exceptions) as well as user defined types.  So it makes
sense to optimise the case of 1 parent type by storing just the type and
not a tuple of 1 value (that value being the single parent type).

This patch makes such an optimisation.  Even though there is a bit more
code to handle the two cases (either a single type or a tuple with 2 or
more values) it helps reduce overall code size because it eliminates the
need to create a static tuple to hold single parents (eg for the built-in
exceptions).  It also helps reduce RAM usage for user defined types that
only derive from a single parent.

Changes in code size (in bytes) due to this patch:

    bare-arm:       -16
    minimal (x86): -176
    unix (x86-64): -320
    unix nanbox:   -384
    stmhal:         -64
    cc3200:         -32
    esp8266:       -108
2017-04-12 13:22:21 +10:00
Damien George ee86de1f1a py: Make sure that static emg-exc-buffer is aligned to size of mp_obj_t.
This buffer is used to allocate objects temporarily, and such objects
require that their underlying memory be correctly aligned for their data
type.  Aligning for mp_obj_t should be sufficient for emergency exceptions,
but in general the memory buffer should aligned to the maximum alignment of
the machine (eg on a 32-bit machine with mp_obj_t being 4 bytes, a double
may not be correctly aligned).

This patch fixes a bug for certain nan-boxing builds, where mp_obj_t is 8
bytes and must be aligned to 8 bytes (even though the machine is 32 bit).
2017-04-10 16:02:56 +10:00
Damien George fa5a591757 py/objexcept: Convert mp_uint_t to size_t where appropriate. 2017-02-16 16:51:17 +11:00
Damien George 5bea080737 py/objexcept: Replace if-cond and assert(0) with simple assert. 2017-01-17 17:03:16 +11:00
Paul Sokolovsky c3d96d387c py/objexcept: Allow clearing traceback with 'exc.__traceback__ = None'.
We allow 'exc.__traceback__ = None' assignment as a low-level optimization
of pre-allocating exception instance and raising it repeatedly - this
avoids memory allocation during raise. However, uPy will keep adding
traceback entries to such exception instance, so before throwing it,
traceback should be cleared like above.

'exc.__traceback__ = None' syntax is CPython compatible. However, unlike
it, reading that attribute or setting it to any other value is not
supported (and not intended to be supported, again, the only reason for
adding this feature is to allow zero-memalloc exception raising).
2016-11-14 02:29:09 +03:00
Damien George 9a92499641 py/objexcept: Don't convert errno to str in constructor, do it in print.
OSError's are now printed like:

    OSError: [Errno 1] EPERM

but only if the string corresponding to the errno is found.
2016-05-12 14:27:52 +01:00
Damien George d45e5f8c35 py: Add mp_errno_to_str() and use it to provide nicer OSError msgs.
If an OSError is raised with an integer argument, and that integer
corresponds to an errno, then the string for the errno is used as the
argument to the exception, instead of the integer.  Only works if
the uerrno module is enabled.
2016-05-12 13:20:40 +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 5b3f0b7f39 py: Change first arg of type.make_new from mp_obj_t to mp_obj_type_t*.
The first argument to the type.make_new method is naturally a uPy type,
and all uses of this argument cast it directly to a pointer to a type
structure.  So it makes sense to just have it a pointer to a type from
the very beginning (and a const pointer at that).  This patch makes
such a change, and removes all unnecessary casting to/from mp_obj_t.
2016-01-11 00:49:27 +00:00
Damien George 4b72b3a133 py: Change type signature of builtin funs that take variable or kw args.
With this patch the n_args parameter is changed type from mp_uint_t to
size_t.
2016-01-11 00:49:27 +00:00
Damien George a0c97814df py: Change type of .make_new and .call args: mp_uint_t becomes size_t.
This patch changes the type signature of .make_new and .call object method
slots to use size_t for n_args and n_kw (was mp_uint_t.  Makes code more
efficient when mp_uint_t is larger than a machine word.  Doesn't affect
ports when size_t and mp_uint_t have the same size.
2016-01-11 00:48:41 +00:00
Damien George 3d2daa2d03 py: Change exception traceback data to use size_t instead of mp_uint_t.
The traceback array stores qstrs and line numbers.  qstrs are typed as
size_t, and line numbers should safely fit in size_t as well.
2016-01-02 22:04:12 +00:00
Damien George 999cedb90f py: Wrap all obj-ptr conversions in MP_OBJ_TO_PTR/MP_OBJ_FROM_PTR.
This allows the mp_obj_t type to be configured to something other than a
pointer-sized primitive type.

This patch also includes additional changes to allow the code to compile
when sizeof(mp_uint_t) != sizeof(void*), such as using size_t instead of
mp_uint_t, and various casts.
2015-11-29 14:25:35 +00:00
Damien George cbf7674025 py: Add MP_ROM_* macros and mp_rom_* types and use them. 2015-11-29 14:25:04 +00:00
Damien George ade9a05236 py: Improve allocation policy of qstr data.
Previous to this patch all interned strings lived in their own malloc'd
chunk.  On average this wastes N/2 bytes per interned string, where N is
the number-of-bytes for a quanta of the memory allocator (16 bytes on 32
bit archs).

With this patch interned strings are concatenated into the same malloc'd
chunk when possible.  Such chunks are enlarged inplace when possible,
and shrunk to fit when a new chunk is needed.

RAM savings with this patch are highly varied, but should always show an
improvement (unless only 3 or 4 strings are interned).  New version
typically uses about 70% of previous memory for the qstr data, and can
lead to savings of around 10% of total memory footprint of a running
script.

Costs about 120 bytes code size on Thumb2 archs (depends on how many
calls to gc_realloc are made).
2015-07-14 22:56:32 +01:00
Daniel Campora 077812b2ab py: Add TimeoutError exception subclassed from OSError.
The TimeoutError is useful for some modules, specially the the
socket module. TimeoutError can then be alised to socket.timeout
and then Python code can differentiate between socket.error and
socket.timeout.
2015-07-02 11:53:08 +02:00
Damien George c8b60f013b py: Make viper codegen raise proper exception (ViperTypeError) on error.
This fixes a long standing problem that viper code generation gave
terrible error messages, and actually no errors on pyboard where
assertions are disabled.

Now all compile-time errors are raised as proper Python exceptions, and
are of type ViperTypeError.

Addresses issue #940.
2015-04-20 13:29:31 +00:00
Damien George 044c473de2 py: Add %q format support to mp_[v]printf, and use it. 2015-04-16 14:30:16 +00:00
Damien George 7f9d1d6ab9 py: Overhaul and simplify printf/pfenv mechanism.
Previous to this patch the printing mechanism was a bit of a tangled
mess.  This patch attempts to consolidate printing into one interface.

All (non-debug) printing now uses the mp_print* family of functions,
mainly mp_printf.  All these functions take an mp_print_t structure as
their first argument, and this structure defines the printing backend
through the "print_strn" function of said structure.

Printing from the uPy core can reach the platform-defined print code via
two paths: either through mp_sys_stdout_obj (defined pert port) in
conjunction with mp_stream_write; or through the mp_plat_print structure
which uses the MP_PLAT_PRINT_STRN macro to define how string are printed
on the platform.  The former is only used when MICROPY_PY_IO is defined.

With this new scheme printing is generally more efficient (less layers
to go through, less arguments to pass), and, given an mp_print_t*
structure, one can call mp_print_str for efficiency instead of
mp_printf("%s", ...).  Code size is also reduced by around 200 bytes on
Thumb2 archs.
2015-04-16 14:30:16 +00:00
Damien George b1bbe966c4 py: Combine load_attr and store_attr type methods into one (attr).
This simplifies the API for objects and reduces code size (by around 400
bytes on Thumb2, and around 2k on x86).  Performance impact was measured
with Pystone score, but change was barely noticeable.
2015-04-11 16:54:37 +01:00
Damien George 4d77e1a034 py: Use m_{new,renew,del} consistently.
This is so all memory requests go through the same interface.
2015-02-27 09:34:51 +00:00
Damien George 4852e09c79 py: Fix adding of traceback so that it appends to existing info.
This makes exception traceback info self contained (ie doesn't rely on
list object, which was a bit of a hack), reduces code size, and reduces
RAM footprint of exception by eliminating the list object.

Addresses part of issue #1126.
2015-02-27 00:36:39 +00:00
Paul Sokolovsky 71ebd4b7f0 py: Implement UnicodeError.
Still too shy to implement UnicodeEncodeError which was really needed for
micropython-lib case.
2015-02-23 23:20:16 +02:00
Paul Sokolovsky fa3b895145 objexcept: Optimize traceback allocation for exception.
Traceback allocation for exception will now never lead to recursive
MemoryError exception - if there's no memory for traceback, it simply
won't be created.
2015-02-15 22:41:14 +03:00
Paul Sokolovsky 29c4f92e13 objexcept: Optimize using messages without formatting substitutions.
They are directly cast to str object, skipping allocation of formatting
buffer.
2015-02-15 22:41:14 +03:00
Damien George 0b9ee86133 py: Add mp_obj_new_str_from_vstr, and use it where relevant.
This patch allows to reuse vstr memory when creating str/bytes object.
This improves memory usage.

Also saves code ROM: 128 bytes on stmhal, 92 bytes on bare-arm, and 88
bytes on unix x64.
2015-01-21 23:17:27 +00:00
Damien George 50149a5730 py: Use mp_arg_check_num in some _make_new functions.
Reduces stmhal code size by about 250 bytes.
2015-01-20 14:11:27 +00:00
Damien George b4b10fd350 py: Put all global state together in state structures.
This patch consolidates all global variables in py/ core into one place,
in a global structure.  Root pointers are all located together to make
GC tracing easier and more efficient.
2015-01-07 20:33:00 +00:00
Damien George 51dfcb4bb7 py: Move to guarded includes, everywhere in py/ core.
Addresses issue #1022.
2015-01-01 20:32:09 +00:00
Damien George 109c1de015 py: Make gc.enable/disable just control auto-GC; alloc is still allowed.
gc.enable/disable are now the same as CPython: they just control whether
automatic garbage collection is enabled or not.  If disabled, you can
still allocate heap memory, and initiate a manual collection.
2014-10-31 21:30:46 +00:00
Damien George 124df6f8d0 py: Add mp_pending_exception global variable, for VM soft interrupt.
This allows to implement KeyboardInterrupt on unix, and a much safer
ctrl-C in stmhal port.  First ctrl-C is a soft one, with hope that VM
will notice it; second ctrl-C is a hard one that kills anything (for
both unix and stmhal).

One needs to check for a pending exception in the VM only for jump
opcodes.  Others can't produce an infinite loop (infinite recursion is
caught by stack check).
2014-10-25 23:37:57 +01:00
Damien George e7a478204a py: Remove unused and unneeded SystemError exception.
It's purpose is for internal errors that are not catastrophic (ie not as
bad as RuntimeError).  Since we don't use it, we don't need it.
2014-10-22 19:42:55 +01:00
Damien George 4859edb95b py: Fix dummy definition of BEGIN/END_ATOMIC_SECTION. 2014-10-15 17:33:24 +00:00
Damien George 8b03d944e2 py: Remove IOError since it's deprecated; use OSError instead.
In CPython IOError (and EnvironmentError) is deprecated and aliased to
OSError.  All modules that used to raise IOError now raise OSError (or a
derived exception).

In Micro Python we never used IOError (except 1 place, incorrectly) and
so don't need to keep it.

See http://legacy.python.org/dev/peps/pep-3151/ for background.
2014-09-30 13:59:30 +00:00
Damien George 4bcd04bcad py: Tidy up exception matching; allow matching of tuple of exceptions.
Addresses issue #864.
2014-09-25 15:49:26 +01:00
Damien George d182b98a37 py: Change all uint to mp_uint_t in obj.h.
Part of code cleanup, working towards resolving issue #50.
2014-08-30 14:19:41 +01:00
Damien George 9c4cbe2ac0 py: Make tuple and list use mp_int_t/mp_uint_t.
Part of code cleanup, to resolve issue #50.
2014-08-30 14:04:14 +01:00
Damien George ecc88e949c Change some parts of the core API to use mp_uint_t instead of uint/int.
Addressing issue #50, still some way to go yet.
2014-08-30 00:35:11 +01:00
Damien George e5cbb70328 stmhal: Make enable_irq and disable_irq inline functions.
These functions are generally 1 machine instruction, and are used in
critical code, so makes sense to have them inline.

Also leave these functions uninverted (ie 0 means enable, 1 means
disable) and provide macro constants if you really need to distinguish
the states.  This makes for smaller code as well (combined with
inlining).

Applied to teensy port as well.
2014-08-25 13:24:33 +01:00
Dave Hylands 9480138f0c Add save/restore_irq
Factored irq functions into a separate file.
2014-08-25 12:22:11 +01:00
Dave Hylands 5b7fd20fea Add support for storing args during an exception raised by an irq.
The user code should call micropython.alloc_emergency_exception_buf(size)
where size is the size of the buffer used to print the argument
passed to the exception.

With the test code from #732, and a call to
micropython.alloc_emergenncy_exception_buf(100) the following error is
now printed:
```python
>>> import heartbeat_irq
Uncaught exception in Timer(4) interrupt handler
Traceback (most recent call last):
  File "0://heartbeat_irq.py", line 14, in heartbeat_cb
NameError: name 'led' is not defined
```
2014-07-25 14:00:06 -07:00