mirror of
https://github.com/python/cpython
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64949cb753
The majority of the changes are in the compiler. The mainloop changes
primarily to implement the new opcodes and to pass a function's
closure to eval_code2(). Frames and functions got new slots to hold
the closure.
Include/compile.h
Add co_freevars and co_cellvars slots to code objects.
Update PyCode_New() to take freevars and cellvars as arguments
Include/funcobject.h
Add func_closure slot to function objects.
Add GetClosure()/SetClosure() functions (and corresponding
macros) for getting at the closure.
Include/frameobject.h
PyFrame_New() now takes a closure.
Include/opcode.h
Add four new opcodes: MAKE_CLOSURE, LOAD_CLOSURE, LOAD_DEREF,
STORE_DEREF.
Remove comment about old requirement for opcodes to fit in 7
bits.
compile.c
Implement changes to code objects for co_freevars and co_cellvars.
Modify symbol table to use st_cur_name (string object for the name
of the current scope) and st_cur_children (list of nested blocks).
Also define st_nested, which might more properly be called
st_cur_nested. Add several DEF_XXX flags to track def-use
information for free variables.
New or modified functions of note:
com_make_closure(struct compiling *, PyCodeObject *)
Emit LOAD_CLOSURE opcodes as needed to pass cells for free
variables into nested scope.
com_addop_varname(struct compiling *, int, char *)
Emits opcodes for LOAD_DEREF and STORE_DEREF.
get_ref_type(struct compiling *, char *name)
Return NAME_CLOSURE if ref type is FREE or CELL
symtable_load_symbols(struct compiling *)
Decides what variables are cell or free based on def-use info.
Can now raise SyntaxError if nested scopes are mixed with
exec or from blah import *.
make_scope_info(PyObject *, PyObject *, int, int)
Helper functions for symtable scope stack.
symtable_update_free_vars(struct symtable *)
After a code block has been analyzed, it must check each of
its children for free variables that are not defined in the
block. If a variable is free in a child and not defined in
the parent, then it is defined by block the enclosing the
current one or it is a global. This does the right logic.
symtable_add_use() is now a macro for symtable_add_def()
symtable_assign(struct symtable *, node *)
Use goto instead of for (;;)
Fixed bug in symtable where name of keyword argument in function
call was treated as assignment in the scope of the call site. Ex:
def f():
g(a=2) # a was considered a local of f
ceval.c
eval_code2() now take one more argument, a closure.
Implement LOAD_CLOSURE, LOAD_DEREF, STORE_DEREF, MAKE_CLOSURE>
Also: When name error occurs for global variable, report that the
name was global in the error mesage.
Objects/frameobject.c
Initialize f_closure to be a tuple containing space for cellvars
and freevars. f_closure is NULL if neither are present.
Objects/funcobject.c
Add support for func_closure.
Python/import.c
Change the magic number.
Python/marshal.c
Track changes to code objects.
60 lines
2 KiB
C
60 lines
2 KiB
C
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/* Definitions for bytecode */
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#ifndef Py_COMPILE_H
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#define Py_COMPILE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Bytecode object */
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typedef struct {
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PyObject_HEAD
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int co_argcount; /* #arguments, except *args */
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int co_nlocals; /* #local variables */
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int co_stacksize; /* #entries needed for evaluation stack */
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int co_flags; /* CO_..., see below */
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PyObject *co_code; /* instruction opcodes */
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PyObject *co_consts; /* list (constants used) */
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PyObject *co_names; /* list of strings (names used) */
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PyObject *co_varnames; /* tuple of strings (local variable names) */
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PyObject *co_freevars; /* tuple of strings (free variable names) */
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PyObject *co_cellvars; /* tuple of strings (cell variable names) */
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/* The rest doesn't count for hash/cmp */
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PyObject *co_filename; /* string (where it was loaded from) */
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PyObject *co_name; /* string (name, for reference) */
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int co_firstlineno; /* first source line number */
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PyObject *co_lnotab; /* string (encoding addr<->lineno mapping) */
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} PyCodeObject;
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/* Masks for co_flags above */
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#define CO_OPTIMIZED 0x0001
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#define CO_NEWLOCALS 0x0002
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#define CO_VARARGS 0x0004
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#define CO_VARKEYWORDS 0x0008
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extern DL_IMPORT(PyTypeObject) PyCode_Type;
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#define PyCode_Check(op) ((op)->ob_type == &PyCode_Type)
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#define CO_MAXBLOCKS 20 /* Max static block nesting within a function */
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/* Public interface */
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struct _node; /* Declare the existence of this type */
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DL_IMPORT(PyCodeObject *) PyNode_Compile(struct _node *, char *);
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DL_IMPORT(PyCodeObject *) PyCode_New(
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int, int, int, int, PyObject *, PyObject *, PyObject *, PyObject *,
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PyObject *, PyObject *, PyObject *, PyObject *, int, PyObject *);
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/* same as struct above */
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DL_IMPORT(int) PyCode_Addr2Line(PyCodeObject *, int);
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/* for internal use only */
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#define _PyCode_GETCODEPTR(co, pp) \
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((*(co)->co_code->ob_type->tp_as_buffer->bf_getreadbuffer) \
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((co)->co_code, 0, (void **)(pp)))
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_COMPILE_H */
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