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Fix issue #1689458 by teaching frame_setlineno how to jump to the first line of

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a code object.
This commit is contained in:
Jeffrey Yasskin 2009-05-20 17:57:57 +00:00
parent cf4ad76a0a
commit c8d30fec16
2 changed files with 41 additions and 14 deletions
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21
Lib/test/test_trace.py
View file

@ -740,6 +740,27 @@ class JumpTestCase(unittest.TestCase):
def test_19_no_jump_without_trace_function(self):
no_jump_without_trace_function()
def test_jump_to_firstlineno(self):
# This tests that PDB can jump back to the first line in a
# file. See issue #1689458. It can only be triggered in a
# function call if the function is defined on a single line.
code = compile("""
# Comments don't count.
output.append(2) # firstlineno is here.
output.append(3)
output.append(4)
""", "<fake module>", "exec")
class fake_function:
func_code = code
jump = (2, 0)
tracer = JumpTracer(fake_function)
sys.settrace(tracer.trace)
namespace = {"output": []}
exec code in namespace
sys.settrace(None)
self.compare_jump_output([2, 3, 2, 3, 4], namespace["output"])
def test_main():
test_support.run_unittest(
TraceTestCase,

34
Objects/frameobject.c
View file

@ -140,20 +140,26 @@ frame_setlineno(PyFrameObject *f, PyObject* p_new_lineno)
new_lineno);
return -1;
}
/* Find the bytecode offset for the start of the given line, or the
* first code-owning line after it. */
PyString_AsStringAndSize(f->f_code->co_lnotab, &lnotab, &lnotab_len);
addr = 0;
line = f->f_code->co_firstlineno;
new_lasti = -1;
for (offset = 0; offset < lnotab_len; offset += 2) {
addr += lnotab[offset];
line += lnotab[offset+1];
if (line >= new_lineno) {
new_lasti = addr;
new_lineno = line;
break;
else if (new_lineno == f->f_code->co_firstlineno) {
new_lasti = 0;
new_lineno = f->f_code->co_firstlineno;
}
else {
/* Find the bytecode offset for the start of the given
* line, or the first code-owning line after it. */
PyString_AsStringAndSize(f->f_code->co_lnotab,
&lnotab, &lnotab_len);
addr = 0;
line = f->f_code->co_firstlineno;
new_lasti = -1;
for (offset = 0; offset < lnotab_len; offset += 2) {
addr += lnotab[offset];
line += lnotab[offset+1];
if (line >= new_lineno) {
new_lasti = addr;
new_lineno = line;
break;
}
}
}