Commit Graph

214 Commits

Author SHA1 Message Date
Damien George 40d8430ee3 py/vm: Add macros to hook into various points in the VM.
These can be used to insert arbitrary checks, polling, etc into the VM.
They are left general because the VM is a highly tuned loop and it should
be up to a given port how that port wants to modify the VM internals.

One common use would be to insert a polling check, but only done after
a certain number of opcodes were executed, so as not to slow down the VM
too much.  For example:

 #define MICROPY_VM_HOOK_COUNT (30)
 #define MICROPY_VM_HOOK_INIT static uint vm_hook_divisor = MICROPY_VM_HOOK_COUNT
 #define MICROPY_VM_HOOK_POLL if (--vm_hook_divisor == 0) { \
     vm_hook_divisor = MICROPY_VM_HOOK_COUNT;
     extern void vm_hook_function(void);
     vm_hook_function();
 }
 #define MICROPY_VM_HOOK_LOOP MICROPY_VM_HOOK_POLL
 #define MICROPY_VM_HOOK_RETURN MICROPY_VM_HOOK_POLL
2016-02-17 09:02:19 +00:00
Damien George 93bb7dffd2 py/vm: Fix popping of exception block in UNWIND_JUMP opcode.
Fixes issue #1812.
2016-02-01 16:07:21 +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 8047340d75 py: Handle case of return within the finally block of try-finally.
Addresses issue #1636.
2015-12-24 12:47:39 +00:00
Damien George 7a30e87d2b py: Fix MICROPY_STACKLESS mode to compile with MICROPY_OBJ_REPR_D. 2015-12-17 12:32:41 +00:00
Damien George bdbe8c9ae2 py: Make UNARY_OP_NOT a first-class op, to agree with Py not semantics.
Fixes #1684 and makes "not" match Python semantics.  The code is also
simplified (the separate MP_BC_NOT opcode is removed) and the patch saves
68 bytes for bare-arm/ and 52 bytes for minimal/.

Previously "not x" was implemented as !mp_unary_op(x, MP_UNARY_OP_BOOL),
so any given object only needs to implement MP_UNARY_OP_BOOL (and the VM
had a special opcode to do the ! bit).

With this patch "not x" is implemented as mp_unary_op(x, MP_UNARY_OP_NOT),
but this operation is caught at the start of mp_unary_op and dispatched as
!mp_obj_is_true(x).  mp_obj_is_true has special logic to test for
truthness, and is the correct way to handle the not operation.
2015-12-10 22:19:48 +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 c8e9c0d89a py: Add MICROPY_PERSISTENT_CODE so code can persist beyond the runtime.
Main changes when MICROPY_PERSISTENT_CODE is enabled are:

- qstrs are encoded as 2-byte fixed width in the bytecode
- all pointers are removed from bytecode and put in const_table (this
  includes const objects and raw code pointers)

Ultimately this option will enable persistence for not just bytecode but
also native code.
2015-11-13 12:49:18 +00:00
Damien George 4bf3f2d3c0 py: Fix with+for+return bug by popping for-iter when unwinding exc stack.
Addresses issue #1182.
2015-10-15 17:48:28 +01:00
Paul Sokolovsky 2ff2ea5f3b vm: Handle "raise X from Y" statements the best way we can.
By issuing a warning that exception chaining is not supported, and ignoring
"from Y" argument.
2015-09-01 10:39:04 +03:00
Damien George 59fba2d6ea py: Remove mp_load_const_bytes and instead load precreated bytes object.
Previous to this patch each time a bytes object was referenced a new
instance (with the same data) was created.  With this patch a single
bytes object is created in the compiler and is loaded directly at execute
time as a true constant (similar to loading bignum and float objects).
This saves on allocating RAM and means that bytes objects can now be
used when the memory manager is locked (eg in interrupts).

The MP_BC_LOAD_CONST_BYTES bytecode was removed as part of this.

Generated bytecode is slightly larger due to storing a pointer to the
bytes object instead of the qstr identifier.

Code size is reduced by about 60 bytes on Thumb2 architectures.
2015-06-25 14:42:13 +00:00
Damien George ed570e4b2a py: Remove mp_load_const_str and replace uses with inlined version. 2015-06-25 13:58:41 +00:00
Damien George c5029bcbf3 py: Add MP_BINARY_OP_DIVMOD to simplify and consolidate divmod builtin. 2015-06-13 23:36:30 +01:00
Damien George c2a4e4effc py: Convert hash API to use MP_UNARY_OP_HASH instead of ad-hoc function.
Hashing is now done using mp_unary_op function with MP_UNARY_OP_HASH as
the operator argument.  Hashing for int, str and bytes still go via
fast-path in mp_unary_op since they are the most common objects which
need to be hashed.

This lead to quite a bit of code cleanup, and should be more efficient
if anything.  It saves 176 bytes code space on Thumb2, and 360 bytes on
x86.

The only loss is that the error message "unhashable type" is now the
more generic "unsupported type for __hash__".
2015-05-12 22:46:02 +01:00
Paul Sokolovsky 6738c1dded vm: Properly handle StopIteration raised in user instance iterator.
I.e. in bytecode Python functions.
2015-05-11 23:57:42 +01:00
Paul Sokolovsky a7c02c4538 vm: Null pointer test when checking for StopIteration optimizations.
When generator raises exception, it is automatically terminated (by setting
its code_state.ip to 0), which interferes with this check.

Triggered in particular by CPython's test_pep380.py.
2015-05-10 17:20:46 +03:00
Damien George 8872abcbc4 py: Remove LOAD_CONST_ELLIPSIS bytecode, use LOAD_CONST_OBJ instead.
Ellipsis constant is rarely used so no point having an extra bytecode
for it.
2015-05-05 22:15:42 +01:00
Paul Sokolovsky ae2c81ff38 vm: On exiting except block, clear sys.exc_info() value.
This doesn't handle case fo enclosed except blocks, but once again,
sys.exc_info() support is a workaround for software which uses it
instead of properly catching exceptions via variable in except clause.
2015-04-26 01:40:37 +03:00
Paul Sokolovsky 8b85d14b92 modsys: Add basic sys.exc_info() implementation.
The implementation is very basic and non-compliant and provided solely for
CPython compatibility. The function itself is bad Python2 heritage, its
usage is discouraged.
2015-04-25 03:49:23 +03:00
Damien George 8c1d23a0e2 py: Modify bytecode "with" behaviour so it doesn't use any heap.
Before this patch a "with" block needed to create a bound method object
on the heap for the __exit__ call.  Now it doesn't because we use
load_method instead of load_attr, and save the method+self on the stack.
2015-04-24 01:52:28 +01:00
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 4dea922610 py: Adjust some spaces in code style/format, purely for consistency. 2015-04-09 15:29:54 +00:00
stijn 36cc84a2a9 py: Fix msvc warning '*/ found outside of comment'
Also prevents some of the weaker syntax parsers out there treating the whole
'*/*const*/' part as a comment
2015-04-09 12:40:38 +02:00
Damien George 12a5e17afb py: Add finer configuration of static funcs when not in stackless mode.
Also rename call_args_t to mp_call_args_t.
2015-04-02 22:56:58 +01:00
Paul Sokolovsky 7f1c98177b vm: Support strict stackless mode, with proper exception reporting.
I.e. in this mode, C stack will never be used to call a Python function,
but if there's no free heap for a call, it will be reported as
RuntimeError (as expected), not MemoryError.
2015-04-03 00:26:47 +03:00
Paul Sokolovsky f0a8f21190 vm: Implement stackless for CALL_FUNCTION_VAR_KW & CALL_METHOD_VAR_KW. 2015-04-03 00:03:07 +03:00
Paul Sokolovsky 390e92688c vm: Stackless support for MP_BC_CALL_METHOD. 2015-04-03 00:03:07 +03:00
Paul Sokolovsky 332a909d44 vm: If there's no heap to call function in stackless manner, call via C stack. 2015-04-03 00:03:07 +03:00
Paul Sokolovsky 2039757b85 vm: Initial support for calling bytecode functions w/o C stack ("stackless"). 2015-04-03 00:03:07 +03:00
stijn 28fa84b445 py: Add optional support for descriptors' __get__ and __set__ methods.
Disabled by default.  Enabled on unix and windows ports.
2015-03-26 23:55:14 +00:00
Damien George 5e1d993f54 py: Clean up some logic in VM to remove assert(0)'s.
Saves around 30 bytes code on Thumb2 archs.
2015-03-25 22:20:37 +00:00
Damien George 12d6d777e1 py: Small optimisation of logic flow in BC_WITH_CLEANUP bytecode.
Slightly smaller code, and does not need to use C stack to save
temporaries.
2015-02-26 17:54:50 +00:00
Damien George 596f41da04 py: Reuse value stack in VM WITH_CLEANUP opcode to reduce C-stack size.
Saves 8 bytes C-stack on stmhal and 16 bytes on unix x86.
2015-02-10 13:21:42 +00:00
Damien George 7d414a1b52 py: Parse big-int/float/imag constants directly in parser.
Previous to this patch, a big-int, float or imag constant was interned
(made into a qstr) and then parsed at runtime to create an object each
time it was needed.  This is wasteful in RAM and not efficient.  Now,
these constants are parsed straight away in the parser and turned into
objects.  This allows constants with large numbers of digits (so
addresses issue #1103) and takes us a step closer to #722.
2015-02-08 01:57:40 +00:00
Damien George dab1385177 py: Add load_const_obj to emitter, add LOAD_CONST_OBJ to bytecode.
This allows to directly load a Python object to the Python stack.  See
issue #722 for background.
2015-01-13 15:55:54 +00:00
Damien George 7ee91cf861 py: Add option to cache map lookup results in bytecode.
This is a simple optimisation inspired by JITing technology: we cache in
the bytecode (using 1 byte) the offset of the last successful lookup in
a map. This allows us next time round to check in that location in the
hash table (mp_map_t) for the desired entry, and if it's there use that
entry straight away.  Otherwise fallback to a normal map lookup.

Works for LOAD_NAME, LOAD_GLOBAL, LOAD_ATTR and STORE_ATTR opcodes.

On a few tests it gives >90% cache hit and greatly improves speed of
code.

Disabled by default.  Enabled for unix and stmhal ports.
2015-01-07 21:07:23 +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 f89d659e3b py: In VM, for selective ip saving, store 1 byte past last opcode.
This is for efficiency, so we don't need to subtract 1 from the ip
before storing it to code_state->ip.  It saves a lot of ROM bytes on
unix and stmhal.
2014-12-29 00:29:59 +00:00
Paul Sokolovsky 749575097f vm: Record exception ip only for instructions where exceptions may happen.
Mirroring ip to a volatile memory variable for each opcode is an expensive
operation. For quite a lot of often executed opcodes like stack manipulation
or jumps, exceptions cannot actually happen. So, record ip only for opcode
where that's possible.
2014-12-28 07:37:04 +02:00
Damien George 74eb44c392 py: Reduce size of VM exception stack element by 1 machine word.
This optimisation reduces the VM exception stack element (mp_exc_stack_t)
by 1 word, by using bit 1 of a pointer to store whether the opcode was a
FINALLY or WITH opcode.  This optimisation was pending, waiting for
maturity of the exception handling code, which has now proven itself.

Saves 1 machine word RAM for each exception (4->3 words per exception).
Increases stmhal code by 4 bytes, and decreases unix x64 code by 32
bytes.
2014-12-22 12:49:57 +00:00
Damien George 7764f163fa py: Fix label printing in showbc; print sp in vm trace. 2014-12-12 17:18:56 +00:00
Damien George cd97a43f8d py, vm: Make unum a local variable for each opcode that uses it.
This makes no change to the generated code, but it's now easier to
understand since unum is not a "global" variable anymore.
2014-12-02 19:25:10 +00:00
Damien George b0b0012fd8 py: Fix VM dispatch following a pending exception check. 2014-10-26 00:33:23 +01:00
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 8456cc017b py: Compress load-int, load-fast, store-fast, unop, binop bytecodes.
There is a lot potential in compress bytecodes and make more use of the
coding space.  This patch introduces "multi" bytecodes which have their
argument included in the bytecode (by addition).

UNARY_OP and BINARY_OP now no longer take a 1 byte argument for the
opcode.  Rather, the opcode is included in the first byte itself.

LOAD_FAST_[0,1,2] and STORE_FAST_[0,1,2] are removed in favour of their
multi versions, which can take an argument between 0 and 15 inclusive.
The majority of LOAD_FAST/STORE_FAST codes fit in this range and so this
saves a byte for each of these.

LOAD_CONST_SMALL_INT_MULTI is used to load small ints between -16 and 47
inclusive.  Such ints are quite common and now only need 1 byte to
store, and now have much faster decoding.

In all this patch saves about 2% RAM for typically bytecode (1.8% on
64-bit test, 2.5% on pyboard test).  It also reduces the binary size
(because bytecodes are simplified) and doesn't harm performance.
2014-10-25 20:23:13 +01:00
Damien George b534e1b9f1 py: Use variable length encoded uints in more places in bytecode.
Code-info size, block name, source name, n_state and n_exc_stack now use
variable length encoded uints.  This saves 7-9 bytes per bytecode
function for most functions.
2014-09-04 14:44:01 +01:00
Damien George b427d6ae86 py: Fix line number printing for file with 1 line.
With a file with 1 line (and an error on that line), used to show the
line as number 0.  Now shows it correctly as line number 1.

But, when line numbers are disabled, it now prints line number 1 for any
line that has an error (instead of 0 as previously).  This might end up
being confusing, but requires extra RAM and/or hack logic to make it
print something special in the case of no line numbers.
2014-08-26 23:35:57 +01:00
Damien George 4747becc64 py: Improve encoding scheme for line-number to bytecode map.
Reduces by about a factor of 10 on average the amount of RAM needed to
store the line-number to bytecode map in the bytecode prelude.

Using CPython3.4's stdlib for statistics: previously, an average of
13 bytes were used per (bytecode offset, line-number offset) pair, and
now with this improvement, that's down to 1.3 bytes on average.

Large RAM usage before was due to some very large steps in line numbers,
both from the start of the first line in a function way down in the
file, and also functions that have big comments and/or big strings in
them (both cases were significant).

Although the savings are large on average for the CPython stdlib, it
won't have such a big effect for small scripts used in embedded
programming.

Addresses issue #648.
2014-07-31 16:12:01 +00:00
Damien George 40f3c02682 Rename machine_(u)int_t to mp_(u)int_t.
See discussion in issue #50.
2014-07-03 13:25:24 +01:00