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Fix for line events in the case: 

def f(a):
    if a:
      print 5
    else:
      pass
This commit is contained in:
Armin Rigo 2004-03-22 17:52:53 +00:00
parent 77d9a3effa
commit 80d937e986
1 changed files with 31 additions and 1 deletions
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32
Python/compile.c
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@ -629,7 +629,10 @@ struct compiling {
int c_maxstacklevel; /* Maximum stack level */
int c_firstlineno;
PyObject *c_lnotab; /* Table mapping address to line number */
int c_last_addr, c_last_line, c_lnotab_next;
int c_last_addr; /* last op addr seen and recorded in lnotab */
int c_last_line; /* last line seen and recorded in lnotab */
int c_lnotab_next; /* current length of lnotab */
int c_lnotab_last; /* start of last lnotab record added */
char *c_private; /* for private name mangling */
int c_tmpname; /* temporary local name counter */
int c_nested; /* Is block nested funcdef or lamdef? */
@ -848,6 +851,7 @@ com_init(struct compiling *c, const char *filename)
c->c_last_addr = 0;
c->c_last_line = 0;
c->c_lnotab_next = 0;
c->c_lnotab_last = 0;
c->c_tmpname = 0;
c->c_nested = 0;
c->c_closure = 0;
@ -964,6 +968,7 @@ com_set_lineno(struct compiling *c, int lineno)
else {
int incr_addr = c->c_nexti - c->c_last_addr;
int incr_line = lineno - c->c_last_line;
c->c_lnotab_last = c->c_lnotab_next;
while (incr_addr > 255) {
com_add_lnotab(c, 255, 0);
incr_addr -= 255;
@ -980,6 +985,27 @@ com_set_lineno(struct compiling *c, int lineno)
}
}
static void
com_strip_lnotab(struct compiling *c)
{
/* strip the last lnotab entry if no opcode were emitted.
* This prevents a line number to be generated on a final
* pass, like in the following example:
*
* if a:
* print 5
* else:
* pass
*
* Without the fix, a line trace event would be generated
* on the pass even if a is true (because of the implicit
* return).
*/
if (c->c_nexti == c->c_last_addr && c->c_lnotab_last > 0) {
c->c_lnotab_next = c->c_lnotab_last;
}
}
static void
com_addoparg(struct compiling *c, int op, int arg)
{
@ -4167,6 +4193,7 @@ compile_funcdef(struct compiling *c, node *n)
c->c_infunction = 1;
com_node(c, CHILD(n, 4));
c->c_infunction = 0;
com_strip_lnotab(c);
com_addoparg(c, LOAD_CONST, com_addconst(c, Py_None));
com_push(c, 1);
com_addbyte(c, RETURN_VALUE);
@ -4218,6 +4245,7 @@ compile_classdef(struct compiling *c, node *n)
else
(void) com_addconst(c, Py_None);
com_node(c, ch);
com_strip_lnotab(c);
com_addbyte(c, LOAD_LOCALS);
com_push(c, 1);
com_addbyte(c, RETURN_VALUE);
@ -4237,6 +4265,7 @@ compile_node(struct compiling *c, node *n)
n = CHILD(n, 0);
if (TYPE(n) != NEWLINE)
com_node(c, n);
com_strip_lnotab(c);
com_addoparg(c, LOAD_CONST, com_addconst(c, Py_None));
com_push(c, 1);
com_addbyte(c, RETURN_VALUE);
@ -4246,6 +4275,7 @@ compile_node(struct compiling *c, node *n)
case file_input: /* A whole file, or built-in function exec() */
com_file_input(c, n);
com_strip_lnotab(c);
com_addoparg(c, LOAD_CONST, com_addconst(c, Py_None));
com_push(c, 1);
com_addbyte(c, RETURN_VALUE);