diff options
Diffstat (limited to 'Python')
| -rw-r--r-- | Python/_warnings.c | 2 | ||||
| -rw-r--r-- | Python/ceval.c | 27 | ||||
| -rw-r--r-- | Python/compile.c | 54 | ||||
| -rw-r--r-- | Python/traceback.c | 3 |
4 files changed, 17 insertions, 69 deletions
diff --git a/Python/_warnings.c b/Python/_warnings.c index ef7f373..35a840e 100644 --- a/Python/_warnings.c +++ b/Python/_warnings.c @@ -462,7 +462,7 @@ setup_context(Py_ssize_t stack_level, PyObject **filename, int *lineno, } else { globals = f->f_globals; - *lineno = PyCode_Addr2Line(f->f_code, f->f_lasti); + *lineno = PyFrame_GetLineNumber(f); } *module = NULL; diff --git a/Python/ceval.c b/Python/ceval.c index 6141c13..403acd2 100644 --- a/Python/ceval.c +++ b/Python/ceval.c @@ -2761,7 +2761,7 @@ PyEval_EvalFrameEx(PyFrameObject *f, int throwflag) default: fprintf(stderr, "XXX lineno: %d, opcode: %d\n", - PyCode_Addr2Line(f->f_code, f->f_lasti), + PyFrame_GetLineNumber(f), opcode); PyErr_SetString(PyExc_SystemError, "unknown opcode"); why = WHY_EXCEPTION; @@ -3522,33 +3522,30 @@ _PyEval_CallTracing(PyObject *func, PyObject *args) return result; } +/* See Objects/lnotab_notes.txt for a description of how tracing works. */ static int maybe_call_line_trace(Py_tracefunc func, PyObject *obj, PyFrameObject *frame, int *instr_lb, int *instr_ub, int *instr_prev) { int result = 0; + int line = frame->f_lineno; /* If the last instruction executed isn't in the current - instruction window, reset the window. If the last - instruction happens to fall at the start of a line or if it - represents a jump backwards, call the trace function. + instruction window, reset the window. */ - if ((frame->f_lasti < *instr_lb || frame->f_lasti >= *instr_ub)) { - int line; + if (frame->f_lasti < *instr_lb || frame->f_lasti >= *instr_ub) { PyAddrPair bounds; - - line = PyCode_CheckLineNumber(frame->f_code, frame->f_lasti, - &bounds); - if (line >= 0) { - frame->f_lineno = line; - result = call_trace(func, obj, frame, - PyTrace_LINE, Py_None); - } + line = _PyCode_CheckLineNumber(frame->f_code, frame->f_lasti, + &bounds); *instr_lb = bounds.ap_lower; *instr_ub = bounds.ap_upper; } - else if (frame->f_lasti <= *instr_prev) { + /* If the last instruction falls at the start of a line or if + it represents a jump backwards, update the frame's line + number and call the trace function. */ + if (frame->f_lasti == *instr_lb || frame->f_lasti < *instr_prev) { + frame->f_lineno = line; result = call_trace(func, obj, frame, PyTrace_LINE, Py_None); } *instr_prev = frame->f_lasti; diff --git a/Python/compile.c b/Python/compile.c index 787dfe3..24975b6 100644 --- a/Python/compile.c +++ b/Python/compile.c @@ -1748,9 +1748,6 @@ compiler_for(struct compiler *c, stmt_ty s) VISIT(c, expr, s->v.For.iter); ADDOP(c, GET_ITER); compiler_use_next_block(c, start); - /* for expressions must be traced on each iteration, - so we need to set an extra line number. */ - c->u->u_lineno_set = 0; ADDOP_JREL(c, FOR_ITER, cleanup); VISIT(c, expr, s->v.For.target); VISIT_SEQ(c, stmt, s->v.For.body); @@ -1796,9 +1793,6 @@ compiler_while(struct compiler *c, stmt_ty s) if (!compiler_push_fblock(c, LOOP, loop)) return 0; if (constant == -1) { - /* while expressions must be traced on each iteration, - so we need to set an extra line number. */ - c->u->u_lineno_set = 0; VISIT(c, expr, s->v.While.test); ADDOP_JABS(c, POP_JUMP_IF_FALSE, anchor); } @@ -3654,51 +3648,9 @@ blocksize(basicblock *b) return size; } -/* All about a_lnotab. - -c_lnotab is an array of unsigned bytes disguised as a Python string. -It is used to map bytecode offsets to source code line #s (when needed -for tracebacks). - -The array is conceptually a list of - (bytecode offset increment, line number increment) -pairs. The details are important and delicate, best illustrated by example: - - byte code offset source code line number - 0 1 - 6 2 - 50 7 - 350 307 - 361 308 - -The first trick is that these numbers aren't stored, only the increments -from one row to the next (this doesn't really work, but it's a start): - - 0, 1, 6, 1, 44, 5, 300, 300, 11, 1 - -The second trick is that an unsigned byte can't hold negative values, or -values larger than 255, so (a) there's a deep assumption that byte code -offsets and their corresponding line #s both increase monotonically, and (b) -if at least one column jumps by more than 255 from one row to the next, more -than one pair is written to the table. In case #b, there's no way to know -from looking at the table later how many were written. That's the delicate -part. A user of c_lnotab desiring to find the source line number -corresponding to a bytecode address A should do something like this - - lineno = addr = 0 - for addr_incr, line_incr in c_lnotab: - addr += addr_incr - if addr > A: - return lineno - lineno += line_incr - -In order for this to work, when the addr field increments by more than 255, -the line # increment in each pair generated must be 0 until the remaining addr -increment is < 256. So, in the example above, assemble_lnotab (it used -to be called com_set_lineno) should not (as was actually done until 2.2) -expand 300, 300 to 255, 255, 45, 45, - but to 255, 0, 45, 255, 0, 45. -*/ +/* Appends a pair to the end of the line number table, a_lnotab, representing + the instruction's bytecode offset and line number. See + Objects/lnotab_notes.txt for the description of the line number table. */ static int assemble_lnotab(struct assembler *a, struct instr *i) diff --git a/Python/traceback.c b/Python/traceback.c index e77b1b2..1de2df6 100644 --- a/Python/traceback.c +++ b/Python/traceback.c @@ -114,8 +114,7 @@ newtracebackobject(PyTracebackObject *next, PyFrameObject *frame) Py_XINCREF(frame); tb->tb_frame = frame; tb->tb_lasti = frame->f_lasti; - tb->tb_lineno = PyCode_Addr2Line(frame->f_code, - frame->f_lasti); + tb->tb_lineno = PyFrame_GetLineNumber(frame); PyObject_GC_Track(tb); } return tb; |