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PEP 343 -- the with-statement.

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This was started by Mike Bland and completed by Guido
(with help from Neal).

This still needs a __future__ statement added;
Thomas is working on Michael's patch for that aspect.

There's a small amount of code cleanup and refactoring
in ast.c, compile.c and ceval.c (I fixed the lltrace
behavior when EXT_POP is used -- however I had to make
lltrace a static global).
This commit is contained in:
Guido van Rossum 2006-02-27 22:32:47 +00:00
parent 5fec904f84
commit c2e20744b2
23 changed files with 1853 additions and 816 deletions
Download patch file Download diff file Expand all files Collapse all files

49
Python/ceval.c
View file

@ -97,6 +97,7 @@ static PyObject *load_args(PyObject ***, int);
#define CALL_FLAG_KW 2
#ifdef LLTRACE
static int lltrace;
static int prtrace(PyObject *, char *);
#endif
static int call_trace(Py_tracefunc, PyObject *, PyFrameObject *,
@ -540,9 +541,6 @@ PyEval_EvalFrameEx(PyFrameObject *f, int throw)
unsigned char *first_instr;
PyObject *names;
PyObject *consts;
#ifdef LLTRACE
int lltrace;
#endif
#if defined(Py_DEBUG) || defined(LLTRACE)
/* Make it easier to find out where we are with a debugger */
char *filename;
@ -661,10 +659,12 @@ PyEval_EvalFrameEx(PyFrameObject *f, int throw)
#define STACKADJ(n) { (void)(BASIC_STACKADJ(n), \
lltrace && prtrace(TOP(), "stackadj")); \
assert(STACK_LEVEL() <= f->f_stacksize); }
#define EXT_POP(STACK_POINTER) (lltrace && prtrace(*(STACK_POINTER), "ext_pop"), *--(STACK_POINTER))
#else
#define PUSH(v) BASIC_PUSH(v)
#define POP() BASIC_POP()
#define STACKADJ(n) BASIC_STACKADJ(n)
#define EXT_POP(STACK_POINTER) (*--(STACK_POINTER))
#endif
/* Local variable macros */
@ -2172,6 +2172,43 @@ PyEval_EvalFrameEx(PyFrameObject *f, int throw)
STACK_LEVEL());
continue;
case WITH_CLEANUP:
{
/* TOP is the context.__exit__ bound method.
Below that are 1-3 values indicating how/why
we entered the finally clause:
- SECOND = None
- (SECOND, THIRD) = (WHY_RETURN or WHY_CONTINUE), retval
- SECOND = WHY_*; no retval below it
- (SECOND, THIRD, FOURTH) = exc_info()
In the last case, we must call
TOP(SECOND, THIRD, FOURTH)
otherwise we must call
TOP(None, None, None)
but we must preserve the stack entries below TOP.
The code here just sets the stack up for the call;
separate CALL_FUNCTION(3) and POP_TOP opcodes are
emitted by the compiler.
*/
x = TOP();
u = SECOND();
if (PyInt_Check(u) || u == Py_None) {
u = v = w = Py_None;
}
else {
v = THIRD();
w = FOURTH();
}
Py_INCREF(u);
Py_INCREF(v);
Py_INCREF(w);
PUSH(u);
PUSH(v);
PUSH(w);
break;
}
case CALL_FUNCTION:
{
PyObject **sp;
@ -2511,9 +2548,9 @@ fast_yield:
return retval;
}
/* this is gonna seem *real weird*, but if you put some other code between
/* This is gonna seem *real weird*, but if you put some other code between
PyEval_EvalFrame() and PyEval_EvalCodeEx() you will need to adjust
the test in the if statement in Misc/gdbinit:pystack* */
the test in the if statements in Misc/gdbinit (pystack and pystackv). */
PyObject *
PyEval_EvalCodeEx(PyCodeObject *co, PyObject *globals, PyObject *locals,
@ -3473,8 +3510,6 @@ PyEval_GetFuncDesc(PyObject *func)
}
}
#define EXT_POP(STACK_POINTER) (*--(STACK_POINTER))
static void
err_args(PyObject *func, int flags, int nargs)
{