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8c96369513
the next free valuestack slot, not to the base (in America, stacks push and pop at the top -- they mutate at the bottom in Australia <winK>). eval_frame(): assert that f_stacktop isn't NULL upon entry. frame_delloc(): avoid ordered pointer comparisons involving f_stacktop when f_stacktop is NULL.
95 lines
3 KiB
C
95 lines
3 KiB
C
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/* Frame object interface */
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#ifndef Py_FRAMEOBJECT_H
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#define Py_FRAMEOBJECT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct {
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int b_type; /* what kind of block this is */
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int b_handler; /* where to jump to find handler */
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int b_level; /* value stack level to pop to */
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} PyTryBlock;
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typedef struct _frame {
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PyObject_HEAD
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struct _frame *f_back; /* previous frame, or NULL */
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PyCodeObject *f_code; /* code segment */
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PyObject *f_builtins; /* builtin symbol table (PyDictObject) */
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PyObject *f_globals; /* global symbol table (PyDictObject) */
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PyObject *f_locals; /* local symbol table (PyDictObject) */
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PyObject **f_valuestack; /* points after the last local */
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/* Next free slot in f_valuestack. Frame creation sets to f_valuestack.
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Frame evaluation usually NULLs it, but a frame that yields sets it
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to the current stack top. */
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PyObject **f_stacktop;
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PyObject *f_trace; /* Trace function */
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PyObject *f_exc_type, *f_exc_value, *f_exc_traceback;
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PyThreadState *f_tstate;
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int f_lasti; /* Last instruction if called */
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int f_lineno; /* Current line number */
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int f_restricted; /* Flag set if restricted operations
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in this scope */
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int f_iblock; /* index in f_blockstack */
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PyTryBlock f_blockstack[CO_MAXBLOCKS]; /* for try and loop blocks */
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int f_size; /* size of localsplus */
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int f_nlocals; /* number of locals */
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int f_ncells;
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int f_nfreevars;
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int f_stacksize; /* size of value stack */
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PyObject *f_localsplus[1]; /* locals+stack, dynamically sized */
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} PyFrameObject;
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/* Standard object interface */
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extern DL_IMPORT(PyTypeObject) PyFrame_Type;
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#define PyFrame_Check(op) ((op)->ob_type == &PyFrame_Type)
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DL_IMPORT(PyFrameObject *) PyFrame_New(PyThreadState *, PyCodeObject *,
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PyObject *, PyObject *);
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/* The rest of the interface is specific for frame objects */
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/* Tuple access macros */
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#ifndef Py_DEBUG
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#define GETITEM(v, i) PyTuple_GET_ITEM((PyTupleObject *)(v), (i))
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#define GETITEMNAME(v, i) \
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PyString_AS_STRING((PyStringObject *)GETITEM((v), (i)))
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#else
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#define GETITEM(v, i) PyTuple_GetItem((v), (i))
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#define GETITEMNAME(v, i) PyString_AsString(GETITEM(v, i))
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#endif
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#define GETUSTRINGVALUE(s) ((unsigned char *)PyString_AS_STRING(s))
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/* Code access macros */
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#define Getconst(f, i) (GETITEM((f)->f_code->co_consts, (i)))
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#define Getname(f, i) (GETITEMNAME((f)->f_code->co_names, (i)))
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#define Getnamev(f, i) (GETITEM((f)->f_code->co_names, (i)))
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/* Block management functions */
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DL_IMPORT(void) PyFrame_BlockSetup(PyFrameObject *, int, int, int);
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DL_IMPORT(PyTryBlock *) PyFrame_BlockPop(PyFrameObject *);
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/* Extend the value stack */
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DL_IMPORT(PyObject **) PyFrame_ExtendStack(PyFrameObject *, int, int);
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/* Conversions between "fast locals" and locals in dictionary */
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DL_IMPORT(void) PyFrame_LocalsToFast(PyFrameObject *, int);
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DL_IMPORT(void) PyFrame_FastToLocals(PyFrameObject *);
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_FRAMEOBJECT_H */
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