Move tracer.c into a subdirectory, so we can split it up.

--HG--
rename : coverage/tracer.c => coverage/ctracer/tracer.c

1 files changed, 0 insertions, 1415 deletions

diff --git a/coverage/tracer.c b/coverage/tracer.c
deleted file mode 100644
index a56cc000..00000000
--- a/coverage/tracer.c
+++ /dev/null
@@ -1,1415 +0,0 @@
-/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
-/* For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt */
-
-/* C-based Tracer for coverage.py. */
-
-#include "Python.h"
-#include "structmember.h"
-#include "frameobject.h"
-#include "opcode.h"
-
-/* Compile-time debugging helpers */
-#undef WHAT_LOG         /* Define to log the WHAT params in the trace function. */
-#undef TRACE_LOG        /* Define to log our bookkeeping. */
-#undef COLLECT_STATS    /* Collect counters: stats are printed when tracer is stopped. */
-
-#if COLLECT_STATS
-#define STATS(x)        x
-#else
-#define STATS(x)
-#endif
-
-/* Py 2.x and 3.x compatibility */
-
-#if PY_MAJOR_VERSION >= 3
-
-#define MyText_Type         PyUnicode_Type
-#define MyText_AS_BYTES(o)  PyUnicode_AsASCIIString(o)
-#define MyBytes_GET_SIZE(o) PyBytes_GET_SIZE(o)
-#define MyBytes_AS_STRING(o) PyBytes_AS_STRING(o)
-#define MyText_AsString(o)  PyUnicode_AsUTF8(o)
-#define MyText_FromFormat   PyUnicode_FromFormat
-#define MyInt_FromInt(i)    PyLong_FromLong((long)i)
-#define MyInt_AsInt(o)      (int)PyLong_AsLong(o)
-#define MyText_InternFromString(s) \
-                            PyUnicode_InternFromString(s)
-
-#define MyType_HEAD_INIT    PyVarObject_HEAD_INIT(NULL, 0)
-
-#else
-
-#define MyText_Type         PyString_Type
-#define MyText_AS_BYTES(o)  (Py_INCREF(o), o)
-#define MyBytes_GET_SIZE(o) PyString_GET_SIZE(o)
-#define MyBytes_AS_STRING(o) PyString_AS_STRING(o)
-#define MyText_AsString(o)  PyString_AsString(o)
-#define MyText_FromFormat   PyUnicode_FromFormat
-#define MyInt_FromInt(i)    PyInt_FromLong((long)i)
-#define MyInt_AsInt(o)      (int)PyInt_AsLong(o)
-#define MyText_InternFromString(s) \
-                            PyString_InternFromString(s)
-
-#define MyType_HEAD_INIT    PyObject_HEAD_INIT(NULL)  0,
-
-#endif /* Py3k */
-
-/* The values returned to indicate ok or error. */
-#define RET_OK      0
-#define RET_ERROR   -1
-
-/* Python C API helpers. */
-
-static int
-pyint_as_int(PyObject * pyint, int *pint)
-{
-    int the_int = MyInt_AsInt(pyint);
-    if (the_int == -1 && PyErr_Occurred()) {
-        return RET_ERROR;
-    }
-
-    *pint = the_int;
-    return RET_OK;
-}
-
-
-/* An entry on the data stack.  For each call frame, we need to record all
- * the information needed for CTracer_handle_line to operate as quickly as
- * possible.  All PyObject* here are borrowed references.
- */
-typedef struct DataStackEntry {
-    /* The current file_data dictionary.  Borrowed, owned by self->data. */
-    PyObject * file_data;
-
-    /* The disposition object for this frame. If collector.py and control.py
-     * are working properly, this will be an instance of CFileDisposition.
-     */
-    PyObject * disposition;
-
-    /* The FileTracer handling this frame, or None if it's Python. */
-    PyObject * file_tracer;
-
-    /* The line number of the last line recorded, for tracing arcs.
-        -1 means there was no previous line, as when entering a code object.
-    */
-    int last_line;
-} DataStackEntry;
-
-/* A data stack is a dynamically allocated vector of DataStackEntry's. */
-typedef struct DataStack {
-    int depth;      /* The index of the last-used entry in stack. */
-    int alloc;      /* number of entries allocated at stack. */
-    /* The file data at each level, or NULL if not recording. */
-    DataStackEntry * stack;
-} DataStack;
-
-
-typedef struct CFileDisposition {
-    PyObject_HEAD
-
-    PyObject * original_filename;
-    PyObject * canonical_filename;
-    PyObject * source_filename;
-    PyObject * trace;
-    PyObject * reason;
-    PyObject * file_tracer;
-    PyObject * has_dynamic_filename;
-} CFileDisposition;
-
-static void
-CFileDisposition_dealloc(CFileDisposition *self)
-{
-    Py_XDECREF(self->original_filename);
-    Py_XDECREF(self->canonical_filename);
-    Py_XDECREF(self->source_filename);
-    Py_XDECREF(self->trace);
-    Py_XDECREF(self->reason);
-    Py_XDECREF(self->file_tracer);
-    Py_XDECREF(self->has_dynamic_filename);
-}
-
-static PyMemberDef
-CFileDisposition_members[] = {
-    { "original_filename",      T_OBJECT, offsetof(CFileDisposition, original_filename), 0,
-            PyDoc_STR("") },
-
-    { "canonical_filename",     T_OBJECT, offsetof(CFileDisposition, canonical_filename), 0,
-            PyDoc_STR("") },
-
-    { "source_filename",        T_OBJECT, offsetof(CFileDisposition, source_filename), 0,
-            PyDoc_STR("") },
-
-    { "trace",                  T_OBJECT, offsetof(CFileDisposition, trace), 0,
-            PyDoc_STR("") },
-
-    { "reason",                 T_OBJECT, offsetof(CFileDisposition, reason), 0,
-            PyDoc_STR("") },
-
-    { "file_tracer",            T_OBJECT, offsetof(CFileDisposition, file_tracer), 0,
-            PyDoc_STR("") },
-
-    { "has_dynamic_filename",   T_OBJECT, offsetof(CFileDisposition, has_dynamic_filename), 0,
-            PyDoc_STR("") },
-
-    { NULL }
-};
-
-static PyTypeObject
-CFileDispositionType = {
-    MyType_HEAD_INIT
-    "coverage.CFileDispositionType",        /*tp_name*/
-    sizeof(CFileDisposition),  /*tp_basicsize*/
-    0,                         /*tp_itemsize*/
-    (destructor)CFileDisposition_dealloc, /*tp_dealloc*/
-    0,                         /*tp_print*/
-    0,                         /*tp_getattr*/
-    0,                         /*tp_setattr*/
-    0,                         /*tp_compare*/
-    0,                         /*tp_repr*/
-    0,                         /*tp_as_number*/
-    0,                         /*tp_as_sequence*/
-    0,                         /*tp_as_mapping*/
-    0,                         /*tp_hash */
-    0,                         /*tp_call*/
-    0,                         /*tp_str*/
-    0,                         /*tp_getattro*/
-    0,                         /*tp_setattro*/
-    0,                         /*tp_as_buffer*/
-    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
-    "CFileDisposition objects", /* tp_doc */
-    0,                         /* tp_traverse */
-    0,                         /* tp_clear */
-    0,                         /* tp_richcompare */
-    0,                         /* tp_weaklistoffset */
-    0,                         /* tp_iter */
-    0,                         /* tp_iternext */
-    0,                         /* tp_methods */
-    CFileDisposition_members,  /* tp_members */
-    0,                         /* tp_getset */
-    0,                         /* tp_base */
-    0,                         /* tp_dict */
-    0,                         /* tp_descr_get */
-    0,                         /* tp_descr_set */
-    0,                         /* tp_dictoffset */
-    0,                         /* tp_init */
-    0,                         /* tp_alloc */
-    0,                         /* tp_new */
-};
-
-/* Interned strings to speed GetAttr etc. */
-
-static PyObject *str_trace;
-static PyObject *str_file_tracer;
-static PyObject *str__coverage_enabled;
-static PyObject *str__coverage_plugin;
-static PyObject *str__coverage_plugin_name;
-static PyObject *str_dynamic_source_filename;
-static PyObject *str_line_number_range;
-
-static int
-intern_strings()
-{
-    int ret = RET_ERROR;
-
-#define INTERN_STRING(v, s)                     \
-    v = MyText_InternFromString(s);             \
-    if (v == NULL) {                            \
-        goto error;                             \
-    }
-
-    INTERN_STRING(str_trace, "trace")
-    INTERN_STRING(str_file_tracer, "file_tracer")
-    INTERN_STRING(str__coverage_enabled, "_coverage_enabled")
-    INTERN_STRING(str__coverage_plugin, "_coverage_plugin")
-    INTERN_STRING(str__coverage_plugin_name, "_coverage_plugin_name")
-    INTERN_STRING(str_dynamic_source_filename, "dynamic_source_filename")
-    INTERN_STRING(str_line_number_range, "line_number_range")
-
-    ret = RET_OK;
-
-error:
-    return ret;
-}
-
-/* The CTracer type. */
-
-typedef struct CTracer {
-    PyObject_HEAD
-
-    /* Python objects manipulated directly by the Collector class. */
-    PyObject * should_trace;
-    PyObject * check_include;
-    PyObject * warn;
-    PyObject * concur_id_func;
-    PyObject * data;
-    PyObject * file_tracers;
-    PyObject * should_trace_cache;
-    PyObject * arcs;
-
-    /* Has the tracer been started? */
-    int started;
-    /* Are we tracing arcs, or just lines? */
-    int tracing_arcs;
-
-    /*
-        The data stack is a stack of dictionaries.  Each dictionary collects
-        data for a single source file.  The data stack parallels the call stack:
-        each call pushes the new frame's file data onto the data stack, and each
-        return pops file data off.
-
-        The file data is a dictionary whose form depends on the tracing options.
-        If tracing arcs, the keys are line number pairs.  If not tracing arcs,
-        the keys are line numbers.  In both cases, the value is irrelevant
-        (None).
-    */
-
-    DataStack data_stack;           /* Used if we aren't doing concurrency. */
-
-    PyObject * data_stack_index;    /* Used if we are doing concurrency. */
-    DataStack * data_stacks;
-    int data_stacks_alloc;
-    int data_stacks_used;
-    DataStack * pdata_stack;
-
-    /* The current file's data stack entry, copied from the stack. */
-    DataStackEntry cur_entry;
-
-    /* The parent frame for the last exception event, to fix missing returns. */
-    PyFrameObject * last_exc_back;
-    int last_exc_firstlineno;
-
-#if COLLECT_STATS
-    struct Stats {
-        unsigned int calls;
-        unsigned int lines;
-        unsigned int returns;
-        unsigned int exceptions;
-        unsigned int others;
-        unsigned int new_files;
-        unsigned int missed_returns;
-        unsigned int stack_reallocs;
-        unsigned int errors;
-        unsigned int pycalls;
-    } stats;
-#endif /* COLLECT_STATS */
-} CTracer;
-
-
-#define STACK_DELTA    100
-
-static int
-DataStack_init(CTracer *self, DataStack *pdata_stack)
-{
-    pdata_stack->depth = -1;
-    pdata_stack->stack = NULL;
-    pdata_stack->alloc = 0;
-    return RET_OK;
-}
-
-static void
-DataStack_dealloc(CTracer *self, DataStack *pdata_stack)
-{
-    PyMem_Free(pdata_stack->stack);
-}
-
-static int
-DataStack_grow(CTracer *self, DataStack *pdata_stack)
-{
-    pdata_stack->depth++;
-    if (pdata_stack->depth >= pdata_stack->alloc) {
-        STATS( self->stats.stack_reallocs++; )
-        /* We've outgrown our data_stack array: make it bigger. */
-        int bigger = pdata_stack->alloc + STACK_DELTA;
-        DataStackEntry * bigger_data_stack = PyMem_Realloc(pdata_stack->stack, bigger * sizeof(DataStackEntry));
-        if (bigger_data_stack == NULL) {
-            PyErr_NoMemory();
-            pdata_stack->depth--;
-            return RET_ERROR;
-        }
-        pdata_stack->stack = bigger_data_stack;
-        pdata_stack->alloc = bigger;
-    }
-    return RET_OK;
-}
-
-
-static void CTracer_disable_plugin(CTracer *self, PyObject * disposition);
-
-static int
-CTracer_init(CTracer *self, PyObject *args_unused, PyObject *kwds_unused)
-{
-    int ret = RET_ERROR;
-    PyObject * weakref = NULL;
-
-    if (DataStack_init(self, &self->data_stack) < 0) {
-        goto error;
-    }
-
-    weakref = PyImport_ImportModule("weakref");
-    if (weakref == NULL) {
-        goto error;
-    }
-    STATS( self->stats.pycalls++; )
-    self->data_stack_index = PyObject_CallMethod(weakref, "WeakKeyDictionary", NULL);
-    Py_XDECREF(weakref);
-
-    if (self->data_stack_index == NULL) {
-        goto error;
-    }
-
-    self->pdata_stack = &self->data_stack;
-
-    self->cur_entry.last_line = -1;
-
-    ret = RET_OK;
-    goto ok;
-
-error:
-    STATS( self->stats.errors++; )
-
-ok:
-    return ret;
-}
-
-static void
-CTracer_dealloc(CTracer *self)
-{
-    int i;
-
-    if (self->started) {
-        PyEval_SetTrace(NULL, NULL);
-    }
-
-    Py_XDECREF(self->should_trace);
-    Py_XDECREF(self->check_include);
-    Py_XDECREF(self->warn);
-    Py_XDECREF(self->concur_id_func);
-    Py_XDECREF(self->data);
-    Py_XDECREF(self->file_tracers);
-    Py_XDECREF(self->should_trace_cache);
-
-    DataStack_dealloc(self, &self->data_stack);
-    if (self->data_stacks) {
-        for (i = 0; i < self->data_stacks_used; i++) {
-            DataStack_dealloc(self, self->data_stacks + i);
-        }
-        PyMem_Free(self->data_stacks);
-    }
-
-    Py_XDECREF(self->data_stack_index);
-
-    Py_TYPE(self)->tp_free((PyObject*)self);
-}
-
-#if TRACE_LOG
-static const char *
-indent(int n)
-{
-    static const char * spaces =
-        "                                                                    "
-        "                                                                    "
-        "                                                                    "
-        "                                                                    "
-        ;
-    return spaces + strlen(spaces) - n*2;
-}
-
-static int logging = 0;
-/* Set these constants to be a file substring and line number to start logging. */
-static const char * start_file = "tests/views";
-static int start_line = 27;
-
-static void
-showlog(int depth, int lineno, PyObject * filename, const char * msg)
-{
-    if (logging) {
-        printf("%s%3d ", indent(depth), depth);
-        if (lineno) {
-            printf("%4d", lineno);
-        }
-        else {
-            printf("    ");
-        }
-        if (filename) {
-            PyObject *ascii = MyText_AS_BYTES(filename);
-            printf(" %s", MyBytes_AS_STRING(ascii));
-            Py_DECREF(ascii);
-        }
-        if (msg) {
-            printf(" %s", msg);
-        }
-        printf("\n");
-    }
-}
-
-#define SHOWLOG(a,b,c,d)    showlog(a,b,c,d)
-#else
-#define SHOWLOG(a,b,c,d)
-#endif /* TRACE_LOG */
-
-#if WHAT_LOG
-static const char * what_sym[] = {"CALL", "EXC ", "LINE", "RET "};
-#endif
-
-/* Record a pair of integers in self->cur_entry.file_data. */
-static int
-CTracer_record_pair(CTracer *self, int l1, int l2)
-{
-    int ret = RET_ERROR;
-
-    PyObject * t = NULL;
-
-    t = Py_BuildValue("(ii)", l1, l2);
-    if (t == NULL) {
-        goto error;
-    }
-
-    if (PyDict_SetItem(self->cur_entry.file_data, t, Py_None) < 0) {
-        goto error;
-    }
-
-    ret = RET_OK;
-
-error:
-    Py_XDECREF(t);
-
-    return ret;
-}
-
-/* Set self->pdata_stack to the proper data_stack to use. */
-static int
-CTracer_set_pdata_stack(CTracer *self)
-{
-    int ret = RET_ERROR;
-    PyObject * co_obj = NULL;
-    PyObject * stack_index = NULL;
-
-    if (self->concur_id_func != Py_None) {
-        int the_index = 0;
-
-        STATS( self->stats.pycalls++; )
-        co_obj = PyObject_CallObject(self->concur_id_func, NULL);
-        if (co_obj == NULL) {
-            goto error;
-        }
-        stack_index = PyObject_GetItem(self->data_stack_index, co_obj);
-        if (stack_index == NULL) {
-            /* PyObject_GetItem sets an exception if it didn't find the thing. */
-            PyErr_Clear();
-
-            /* A new concurrency object.  Make a new data stack. */
-            the_index = self->data_stacks_used;
-            stack_index = MyInt_FromInt(the_index);
-            if (stack_index == NULL) {
-                goto error;
-            }
-            if (PyObject_SetItem(self->data_stack_index, co_obj, stack_index) < 0) {
-                goto error;
-            }
-            self->data_stacks_used++;
-            if (self->data_stacks_used >= self->data_stacks_alloc) {
-                int bigger = self->data_stacks_alloc + 10;
-                DataStack * bigger_stacks = PyMem_Realloc(self->data_stacks, bigger * sizeof(DataStack));
-                if (bigger_stacks == NULL) {
-                    PyErr_NoMemory();
-                    goto error;
-                }
-                self->data_stacks = bigger_stacks;
-                self->data_stacks_alloc = bigger;
-            }
-            DataStack_init(self, &self->data_stacks[the_index]);
-        }
-        else {
-            if (pyint_as_int(stack_index, &the_index) < 0) {
-                goto error;
-            }
-        }
-
-        self->pdata_stack = &self->data_stacks[the_index];
-    }
-    else {
-        self->pdata_stack = &self->data_stack;
-    }
-
-    ret = RET_OK;
-
-error:
-
-    Py_XDECREF(co_obj);
-    Py_XDECREF(stack_index);
-
-    return ret;
-}
-
-/*
- * Parts of the trace function.
- */
-
-static int
-CTracer_check_missing_return(CTracer *self, PyFrameObject *frame)
-{
-    int ret = RET_ERROR;
-
-    if (self->last_exc_back) {
-        if (frame == self->last_exc_back) {
-            /* Looks like someone forgot to send a return event. We'll clear
-               the exception state and do the RETURN code here.  Notice that the
-               frame we have in hand here is not the correct frame for the RETURN,
-               that frame is gone.  Our handling for RETURN doesn't need the
-               actual frame, but we do log it, so that will look a little off if
-               you're looking at the detailed log.
-
-               If someday we need to examine the frame when doing RETURN, then
-               we'll need to keep more of the missed frame's state.
-            */
-            STATS( self->stats.missed_returns++; )
-            if (CTracer_set_pdata_stack(self) < 0) {
-                goto error;
-            }
-            if (self->pdata_stack->depth >= 0) {
-                if (self->tracing_arcs && self->cur_entry.file_data) {
-                    if (CTracer_record_pair(self, self->cur_entry.last_line, -self->last_exc_firstlineno) < 0) {
-                        goto error;
-                    }
-                }
-                SHOWLOG(self->pdata_stack->depth, frame->f_lineno, frame->f_code->co_filename, "missedreturn");
-                self->cur_entry = self->pdata_stack->stack[self->pdata_stack->depth];
-                self->pdata_stack->depth--;
-            }
-        }
-        self->last_exc_back = NULL;
-    }
-
-    ret = RET_OK;
-
-error:
-
-    return ret;
-}
-
-static int
-CTracer_handle_call(CTracer *self, PyFrameObject *frame)
-{
-    int ret = RET_ERROR;
-    int ret2;
-
-    /* Owned references that we clean up at the very end of the function. */
-    PyObject * disposition = NULL;
-    PyObject * plugin = NULL;
-    PyObject * plugin_name = NULL;
-    PyObject * next_tracename = NULL;
-
-    /* Borrowed references. */
-    PyObject * filename = NULL;
-    PyObject * disp_trace = NULL;
-    PyObject * tracename = NULL;
-    PyObject * file_tracer = NULL;
-    PyObject * has_dynamic_filename = NULL;
-
-    CFileDisposition * pdisp;
-
-
-    STATS( self->stats.calls++; )
-    /* Grow the stack. */
-    if (CTracer_set_pdata_stack(self) < 0) {
-        goto error;
-    }
-    if (DataStack_grow(self, self->pdata_stack) < 0) {
-        goto error;
-    }
-
-    /* Push the current state on the stack. */
-    self->pdata_stack->stack[self->pdata_stack->depth] = self->cur_entry;
-
-    /* Check if we should trace this line. */
-    filename = frame->f_code->co_filename;
-    disposition = PyDict_GetItem(self->should_trace_cache, filename);
-    if (disposition == NULL) {
-        if (PyErr_Occurred()) {
-            goto error;
-        }
-        STATS( self->stats.new_files++; )
-
-        /* We've never considered this file before. */
-        /* Ask should_trace about it. */
-        STATS( self->stats.pycalls++; )
-        disposition = PyObject_CallFunctionObjArgs(self->should_trace, filename, frame, NULL);
-        if (disposition == NULL) {
-            /* An error occurred inside should_trace. */
-            goto error;
-        }
-        if (PyDict_SetItem(self->should_trace_cache, filename, disposition) < 0) {
-            goto error;
-        }
-    }
-    else {
-        Py_INCREF(disposition);
-    }
-
-    if (disposition == Py_None) {
-        /* A later check_include returned false, so don't trace it. */
-        disp_trace = Py_False;
-    }
-    else {
-        /* The object we got is a CFileDisposition, use it efficiently. */
-        pdisp = (CFileDisposition *) disposition;
-        disp_trace = pdisp->trace;
-        if (disp_trace == NULL) {
-            goto error;
-        }
-    }
-
-    if (disp_trace == Py_True) {
-        /* If tracename is a string, then we're supposed to trace. */
-        tracename = pdisp->source_filename;
-        if (tracename == NULL) {
-            goto error;
-        }
-        file_tracer = pdisp->file_tracer;
-        if (file_tracer == NULL) {
-            goto error;
-        }
-        if (file_tracer != Py_None) {
-            plugin = PyObject_GetAttr(file_tracer, str__coverage_plugin);
-            if (plugin == NULL) {
-                goto error;
-            }
-            plugin_name = PyObject_GetAttr(plugin, str__coverage_plugin_name);
-            if (plugin_name == NULL) {
-                goto error;
-            }
-        }
-        has_dynamic_filename = pdisp->has_dynamic_filename;
-        if (has_dynamic_filename == NULL) {
-            goto error;
-        }
-        if (has_dynamic_filename == Py_True) {
-            STATS( self->stats.pycalls++; )
-            next_tracename = PyObject_CallMethodObjArgs(
-                file_tracer, str_dynamic_source_filename,
-                tracename, frame, NULL
-                );
-            if (next_tracename == NULL) {
-                /* An exception from the function. Alert the user with a
-                 * warning and a traceback.
-                 */
-                CTracer_disable_plugin(self, disposition);
-                /* Because we handled the error, goto ok. */
-                goto ok;
-            }
-            tracename = next_tracename;
-
-            if (tracename != Py_None) {
-                /* Check the dynamic source filename against the include rules. */
-                PyObject * included = NULL;
-                int should_include;
-                included = PyDict_GetItem(self->should_trace_cache, tracename);
-                if (included == NULL) {
-                    PyObject * should_include_bool;
-                    if (PyErr_Occurred()) {
-                        goto error;
-                    }
-                    STATS( self->stats.new_files++; )
-                    STATS( self->stats.pycalls++; )
-                    should_include_bool = PyObject_CallFunctionObjArgs(self->check_include, tracename, frame, NULL);
-                    if (should_include_bool == NULL) {
-                        goto error;
-                    }
-                    should_include = (should_include_bool == Py_True);
-                    Py_DECREF(should_include_bool);
-                    if (PyDict_SetItem(self->should_trace_cache, tracename, should_include ? disposition : Py_None) < 0) {
-                        goto error;
-                    }
-                }
-                else {
-                    should_include = (included != Py_None);
-                }
-                if (!should_include) {
-                    tracename = Py_None;
-                }
-            }
-        }
-    }
-    else {
-        tracename = Py_None;
-    }
-
-    if (tracename != Py_None) {
-        PyObject * file_data = PyDict_GetItem(self->data, tracename);
-
-        if (file_data == NULL) {
-            if (PyErr_Occurred()) {
-                goto error;
-            }
-            file_data = PyDict_New();
-            if (file_data == NULL) {
-                goto error;
-            }
-            ret2 = PyDict_SetItem(self->data, tracename, file_data);
-            Py_DECREF(file_data);
-            if (ret2 < 0) {
-                goto error;
-            }
-
-            /* If the disposition mentions a plugin, record that. */
-            if (file_tracer != Py_None) {
-                ret2 = PyDict_SetItem(self->file_tracers, tracename, plugin_name);
-                if (ret2 < 0) {
-                    goto error;
-                }
-            }
-        }
-
-        self->cur_entry.file_data = file_data;
-        self->cur_entry.file_tracer = file_tracer;
-
-        /* Make the frame right in case settrace(gettrace()) happens. */
-        Py_INCREF(self);
-        frame->f_trace = (PyObject*)self;
-        SHOWLOG(self->pdata_stack->depth, frame->f_lineno, filename, "traced");
-    }
-    else {
-        self->cur_entry.file_data = NULL;
-        self->cur_entry.file_tracer = Py_None;
-        SHOWLOG(self->pdata_stack->depth, frame->f_lineno, filename, "skipped");
-    }
-
-    self->cur_entry.disposition = disposition;
-
-    /* A call event is really a "start frame" event, and can happen for
-     * re-entering a generator also.  f_lasti is -1 for a true call, and a
-     * real byte offset for a generator re-entry.
-     */
-    self->cur_entry.last_line = (frame->f_lasti < 0) ? -1 : frame->f_lineno;
-
-ok:
-    ret = RET_OK;
-
-error:
-    Py_XDECREF(next_tracename);
-    Py_XDECREF(disposition);
-    Py_XDECREF(plugin);
-    Py_XDECREF(plugin_name);
-
-    return ret;
-}
-
-
-static void
-CTracer_disable_plugin(CTracer *self, PyObject * disposition)
-{
-    PyObject * file_tracer = NULL;
-    PyObject * plugin = NULL;
-    PyObject * plugin_name = NULL;
-    PyObject * msg = NULL;
-    PyObject * ignored = NULL;
-
-    PyErr_Print();
-
-    file_tracer = PyObject_GetAttr(disposition, str_file_tracer);
-    if (file_tracer == NULL) {
-        goto error;
-    }
-    if (file_tracer == Py_None) {
-        /* This shouldn't happen... */
-        goto ok;
-    }
-    plugin = PyObject_GetAttr(file_tracer, str__coverage_plugin);
-    if (plugin == NULL) {
-        goto error;
-    }
-    plugin_name = PyObject_GetAttr(plugin, str__coverage_plugin_name);
-    if (plugin_name == NULL) {
-        goto error;
-    }
-    msg = MyText_FromFormat(
-        "Disabling plugin '%s' due to previous exception",
-        MyText_AsString(plugin_name)
-        );
-    if (msg == NULL) {
-        goto error;
-    }
-    STATS( self->stats.pycalls++; )
-    ignored = PyObject_CallFunctionObjArgs(self->warn, msg, NULL);
-    if (ignored == NULL) {
-        goto error;
-    }
-
-    /* Disable the plugin for future files, and stop tracing this file. */
-    if (PyObject_SetAttr(plugin, str__coverage_enabled, Py_False) < 0) {
-        goto error;
-    }
-    if (PyObject_SetAttr(disposition, str_trace, Py_False) < 0) {
-        goto error;
-    }
-
-    goto ok;
-
-error:
-    /* This function doesn't return a status, so if an error happens, print it,
-     * but don't interrupt the flow. */
-    /* PySys_WriteStderr is nicer, but is not in the public API. */
-    fprintf(stderr, "Error occurred while disabling plugin:\n");
-    PyErr_Print();
-
-ok:
-    Py_XDECREF(file_tracer);
-    Py_XDECREF(plugin);
-    Py_XDECREF(plugin_name);
-    Py_XDECREF(msg);
-    Py_XDECREF(ignored);
-}
-
-
-static int
-CTracer_unpack_pair(CTracer *self, PyObject *pair, int *p_one, int *p_two)
-{
-    int ret = RET_ERROR;
-    int the_int;
-    PyObject * pyint = NULL;
-    int index;
-
-    if (!PyTuple_Check(pair) || PyTuple_Size(pair) != 2) {
-        PyErr_SetString(
-            PyExc_TypeError,
-            "line_number_range must return 2-tuple"
-            );
-        goto error;
-    }
-
-    for (index = 0; index < 2; index++) {
-        pyint = PyTuple_GetItem(pair, index);
-        if (pyint == NULL) {
-            goto error;
-        }
-        if (pyint_as_int(pyint, &the_int) < 0) {
-            goto error;
-        }
-        *(index == 0 ? p_one : p_two) = the_int;
-    }
-
-    ret = RET_OK;
-
-error:
-    return ret;
-}
-
-static int
-CTracer_handle_line(CTracer *self, PyFrameObject *frame)
-{
-    int ret = RET_ERROR;
-    int ret2;
-
-    STATS( self->stats.lines++; )
-    if (self->pdata_stack->depth >= 0) {
-        SHOWLOG(self->pdata_stack->depth, frame->f_lineno, frame->f_code->co_filename, "line");
-        if (self->cur_entry.file_data) {
-            int lineno_from, lineno_to;
-
-            /* We're tracing in this frame: record something. */
-            if (self->cur_entry.file_tracer != Py_None) {
-                PyObject * from_to = NULL;
-                STATS( self->stats.pycalls++; )
-                from_to = PyObject_CallMethodObjArgs(self->cur_entry.file_tracer, str_line_number_range, frame, NULL);
-                if (from_to == NULL) {
-                    goto error;
-                }
-                ret2 = CTracer_unpack_pair(self, from_to, &lineno_from, &lineno_to);
-                Py_DECREF(from_to);
-                if (ret2 < 0) {
-                    CTracer_disable_plugin(self, self->cur_entry.disposition);
-                    goto ok;
-                }
-            }
-            else {
-                lineno_from = lineno_to = frame->f_lineno;
-            }
-
-            if (lineno_from != -1) {
-                for (; lineno_from <= lineno_to; lineno_from++) {
-                    if (self->tracing_arcs) {
-                        /* Tracing arcs: key is (last_line,this_line). */
-                        if (CTracer_record_pair(self, self->cur_entry.last_line, lineno_from) < 0) {
-                            goto error;
-                        }
-                    }
-                    else {
-                        /* Tracing lines: key is simply this_line. */
-                        PyObject * this_line = MyInt_FromInt(lineno_from);
-                        if (this_line == NULL) {
-                            goto error;
-                        }
-
-                        ret2 = PyDict_SetItem(self->cur_entry.file_data, this_line, Py_None);
-                        Py_DECREF(this_line);
-                        if (ret2 < 0) {
-                            goto error;
-                        }
-                    }
-
-                    self->cur_entry.last_line = lineno_from;
-                }
-            }
-        }
-    }
-
-ok:
-    ret = RET_OK;
-
-error:
-
-    return ret;
-}
-
-static int
-CTracer_handle_return(CTracer *self, PyFrameObject *frame)
-{
-    int ret = RET_ERROR;
-
-    STATS( self->stats.returns++; )
-    /* A near-copy of this code is above in the missing-return handler. */
-    if (CTracer_set_pdata_stack(self) < 0) {
-        goto error;
-    }
-    if (self->pdata_stack->depth >= 0) {
-        if (self->tracing_arcs && self->cur_entry.file_data) {
-            /* Need to distinguish between RETURN_VALUE and YIELD_VALUE. Read
-             * the current bytecode to see what it is.  In unusual circumstances
-             * (Cython code), co_code can be the empty string, so range-check
-             * f_lasti before reading the byte.
-             */
-            int bytecode = RETURN_VALUE;
-            PyObject * pCode = frame->f_code->co_code;
-            int lasti = frame->f_lasti;
-
-            if (lasti < MyBytes_GET_SIZE(pCode)) {
-                bytecode = MyBytes_AS_STRING(pCode)[lasti];
-            }
-            if (bytecode != YIELD_VALUE) {
-                int first = frame->f_code->co_firstlineno;
-                if (CTracer_record_pair(self, self->cur_entry.last_line, -first) < 0) {
-                    goto error;
-                }
-            }
-        }
-
-        SHOWLOG(self->pdata_stack->depth, frame->f_lineno, frame->f_code->co_filename, "return");
-        self->cur_entry = self->pdata_stack->stack[self->pdata_stack->depth];
-        self->pdata_stack->depth--;
-    }
-
-    ret = RET_OK;
-
-error:
-
-    return ret;
-}
-
-static int
-CTracer_handle_exception(CTracer *self, PyFrameObject *frame)
-{
-    /* Some code (Python 2.3, and pyexpat anywhere) fires an exception event
-        without a return event.  To detect that, we'll keep a copy of the
-        parent frame for an exception event.  If the next event is in that
-        frame, then we must have returned without a return event.  We can
-        synthesize the missing event then.
-
-        Python itself fixed this problem in 2.4.  Pyexpat still has the bug.
-        I've reported the problem with pyexpat as http://bugs.python.org/issue6359 .
-        If it gets fixed, this code should still work properly.  Maybe some day
-        the bug will be fixed everywhere coverage.py is supported, and we can
-        remove this missing-return detection.
-
-        More about this fix: http://nedbatchelder.com/blog/200907/a_nasty_little_bug.html
-    */
-    STATS( self->stats.exceptions++; )
-    self->last_exc_back = frame->f_back;
-    self->last_exc_firstlineno = frame->f_code->co_firstlineno;
-
-    return RET_OK;
-}
-
-/*
- * The Trace Function
- */
-static int
-CTracer_trace(CTracer *self, PyFrameObject *frame, int what, PyObject *arg_unused)
-{
-    int ret = RET_ERROR;
-
-    #if WHAT_LOG || TRACE_LOG
-    PyObject * ascii = NULL;
-    #endif
-
-    #if WHAT_LOG
-    if (what <= sizeof(what_sym)/sizeof(const char *)) {
-        ascii = MyText_AS_BYTES(frame->f_code->co_filename);
-        printf("trace: %s @ %s %d\n", what_sym[what], MyBytes_AS_STRING(ascii), frame->f_lineno);
-        Py_DECREF(ascii);
-    }
-    #endif
-
-    #if TRACE_LOG
-    ascii = MyText_AS_BYTES(frame->f_code->co_filename);
-    if (strstr(MyBytes_AS_STRING(ascii), start_file) && frame->f_lineno == start_line) {
-        logging = 1;
-    }
-    Py_DECREF(ascii);
-    #endif
-
-    /* See below for details on missing-return detection. */
-    if (CTracer_check_missing_return(self, frame) < 0) {
-        goto error;
-    }
-
-    switch (what) {
-    case PyTrace_CALL:
-        if (CTracer_handle_call(self, frame) < 0) {
-            goto error;
-        }
-        break;
-
-    case PyTrace_RETURN:
-        if (CTracer_handle_return(self, frame) < 0) {
-            goto error;
-        }
-        break;
-
-    case PyTrace_LINE:
-        if (CTracer_handle_line(self, frame) < 0) {
-            goto error;
-        }
-        break;
-
-    case PyTrace_EXCEPTION:
-        if (CTracer_handle_exception(self, frame) < 0) {
-            goto error;
-        }
-        break;
-
-    default:
-        STATS( self->stats.others++; )
-        break;
-    }
-
-    ret = RET_OK;
-    goto cleanup;
-
-error:
-    STATS( self->stats.errors++; )
-
-cleanup:
-    return ret;
-}
-
-
-/*
- * Python has two ways to set the trace function: sys.settrace(fn), which
- * takes a Python callable, and PyEval_SetTrace(func, obj), which takes
- * a C function and a Python object.  The way these work together is that
- * sys.settrace(pyfn) calls PyEval_SetTrace(builtin_func, pyfn), using the
- * Python callable as the object in PyEval_SetTrace.  So sys.gettrace()
- * simply returns the Python object used as the second argument to
- * PyEval_SetTrace.  So sys.gettrace() will return our self parameter, which
- * means it must be callable to be used in sys.settrace().
- *
- * So we make our self callable, equivalent to invoking our trace function.
- *
- * To help with the process of replaying stored frames, this function has an
- * optional keyword argument:
- *
- *      def CTracer_call(frame, event, arg, lineno=0)
- *
- * If provided, the lineno argument is used as the line number, and the
- * frame's f_lineno member is ignored.
- */
-static PyObject *
-CTracer_call(CTracer *self, PyObject *args, PyObject *kwds)
-{
-    PyFrameObject *frame;
-    PyObject *what_str;
-    PyObject *arg;
-    int lineno = 0;
-    int what;
-    int orig_lineno;
-    PyObject *ret = NULL;
-
-    static char *what_names[] = {
-        "call", "exception", "line", "return",
-        "c_call", "c_exception", "c_return",
-        NULL
-        };
-
-    #if WHAT_LOG
-    printf("pytrace\n");
-    #endif
-
-    static char *kwlist[] = {"frame", "event", "arg", "lineno", NULL};
-
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, "O!O!O|i:Tracer_call", kwlist,
-            &PyFrame_Type, &frame, &MyText_Type, &what_str, &arg, &lineno)) {
-        goto done;
-    }
-
-    /* In Python, the what argument is a string, we need to find an int
-       for the C function. */
-    for (what = 0; what_names[what]; what++) {
-        PyObject *ascii = MyText_AS_BYTES(what_str);
-        int should_break = !strcmp(MyBytes_AS_STRING(ascii), what_names[what]);
-        Py_DECREF(ascii);
-        if (should_break) {
-            break;
-        }
-    }
-
-    /* Save off the frame's lineno, and use the forced one, if provided. */
-    orig_lineno = frame->f_lineno;
-    if (lineno > 0) {
-        frame->f_lineno = lineno;
-    }
-
-    /* Invoke the C function, and return ourselves. */
-    if (CTracer_trace(self, frame, what, arg) == RET_OK) {
-        Py_INCREF(self);
-        ret = (PyObject *)self;
-    }
-
-    /* Clean up. */
-    frame->f_lineno = orig_lineno;
-
-done:
-    return ret;
-}
-
-static PyObject *
-CTracer_start(CTracer *self, PyObject *args_unused)
-{
-    PyEval_SetTrace((Py_tracefunc)CTracer_trace, (PyObject*)self);
-    self->started = 1;
-    self->tracing_arcs = self->arcs && PyObject_IsTrue(self->arcs);
-    self->cur_entry.last_line = -1;
-
-    /* start() returns a trace function usable with sys.settrace() */
-    Py_INCREF(self);
-    return (PyObject *)self;
-}
-
-static PyObject *
-CTracer_stop(CTracer *self, PyObject *args_unused)
-{
-    if (self->started) {
-        PyEval_SetTrace(NULL, NULL);
-        self->started = 0;
-    }
-
-    Py_RETURN_NONE;
-}
-
-static PyObject *
-CTracer_get_stats(CTracer *self)
-{
-#if COLLECT_STATS
-    return Py_BuildValue(
-        "{sI,sI,sI,sI,sI,sI,sI,sI,si,sI,sI}",
-        "calls", self->stats.calls,
-        "lines", self->stats.lines,
-        "returns", self->stats.returns,
-        "exceptions", self->stats.exceptions,
-        "others", self->stats.others,
-        "new_files", self->stats.new_files,
-        "missed_returns", self->stats.missed_returns,
-        "stack_reallocs", self->stats.stack_reallocs,
-        "stack_alloc", self->pdata_stack->alloc,
-        "errors", self->stats.errors,
-        "pycalls", self->stats.pycalls
-        );
-#else
-    Py_RETURN_NONE;
-#endif /* COLLECT_STATS */
-}
-
-static PyMemberDef
-CTracer_members[] = {
-    { "should_trace",       T_OBJECT, offsetof(CTracer, should_trace), 0,
-            PyDoc_STR("Function indicating whether to trace a file.") },
-
-    { "check_include",      T_OBJECT, offsetof(CTracer, check_include), 0,
-            PyDoc_STR("Function indicating whether to include a file.") },
-
-    { "warn",               T_OBJECT, offsetof(CTracer, warn), 0,
-            PyDoc_STR("Function for issuing warnings.") },
-
-    { "concur_id_func",     T_OBJECT, offsetof(CTracer, concur_id_func), 0,
-            PyDoc_STR("Function for determining concurrency context") },
-
-    { "data",               T_OBJECT, offsetof(CTracer, data), 0,
-            PyDoc_STR("The raw dictionary of trace data.") },
-
-    { "file_tracers",       T_OBJECT, offsetof(CTracer, file_tracers), 0,
-            PyDoc_STR("Mapping from filename to plugin name.") },
-
-    { "should_trace_cache", T_OBJECT, offsetof(CTracer, should_trace_cache), 0,
-            PyDoc_STR("Dictionary caching should_trace results.") },
-
-    { "arcs",               T_OBJECT, offsetof(CTracer, arcs), 0,
-            PyDoc_STR("Should we trace arcs, or just lines?") },
-
-    { NULL }
-};
-
-static PyMethodDef
-CTracer_methods[] = {
-    { "start",      (PyCFunction) CTracer_start,        METH_VARARGS,
-            PyDoc_STR("Start the tracer") },
-
-    { "stop",       (PyCFunction) CTracer_stop,         METH_VARARGS,
-            PyDoc_STR("Stop the tracer") },
-
-    { "get_stats",  (PyCFunction) CTracer_get_stats,    METH_VARARGS,
-            PyDoc_STR("Get statistics about the tracing") },
-
-    { NULL }
-};
-
-static PyTypeObject
-CTracerType = {
-    MyType_HEAD_INIT
-    "coverage.CTracer",        /*tp_name*/
-    sizeof(CTracer),           /*tp_basicsize*/
-    0,                         /*tp_itemsize*/
-    (destructor)CTracer_dealloc, /*tp_dealloc*/
-    0,                         /*tp_print*/
-    0,                         /*tp_getattr*/
-    0,                         /*tp_setattr*/
-    0,                         /*tp_compare*/
-    0,                         /*tp_repr*/
-    0,                         /*tp_as_number*/
-    0,                         /*tp_as_sequence*/
-    0,                         /*tp_as_mapping*/
-    0,                         /*tp_hash */
-    (ternaryfunc)CTracer_call, /*tp_call*/
-    0,                         /*tp_str*/
-    0,                         /*tp_getattro*/
-    0,                         /*tp_setattro*/
-    0,                         /*tp_as_buffer*/
-    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
-    "CTracer objects",         /* tp_doc */
-    0,                         /* tp_traverse */
-    0,                         /* tp_clear */
-    0,                         /* tp_richcompare */
-    0,                         /* tp_weaklistoffset */
-    0,                         /* tp_iter */
-    0,                         /* tp_iternext */
-    CTracer_methods,           /* tp_methods */
-    CTracer_members,           /* tp_members */
-    0,                         /* tp_getset */
-    0,                         /* tp_base */
-    0,                         /* tp_dict */
-    0,                         /* tp_descr_get */
-    0,                         /* tp_descr_set */
-    0,                         /* tp_dictoffset */
-    (initproc)CTracer_init,    /* tp_init */
-    0,                         /* tp_alloc */
-    0,                         /* tp_new */
-};
-
-/* Module definition */
-
-#define MODULE_DOC PyDoc_STR("Fast coverage tracer.")
-
-#if PY_MAJOR_VERSION >= 3
-
-static PyModuleDef
-moduledef = {
-    PyModuleDef_HEAD_INIT,
-    "coverage.tracer",
-    MODULE_DOC,
-    -1,
-    NULL,       /* methods */
-    NULL,
-    NULL,       /* traverse */
-    NULL,       /* clear */
-    NULL
-};
-
-
-PyObject *
-PyInit_tracer(void)
-{
-    PyObject * mod = PyModule_Create(&moduledef);
-    if (mod == NULL) {
-        return NULL;
-    }
-
-    if (intern_strings() < 0) {
-        return NULL;
-    }
-
-    /* Initialize CTracer */
-    CTracerType.tp_new = PyType_GenericNew;
-    if (PyType_Ready(&CTracerType) < 0) {
-        Py_DECREF(mod);
-        return NULL;
-    }
-
-    Py_INCREF(&CTracerType);
-    if (PyModule_AddObject(mod, "CTracer", (PyObject *)&CTracerType) < 0) {
-        Py_DECREF(mod);
-        Py_DECREF(&CTracerType);
-        return NULL;
-    }
-
-    /* Initialize CFileDisposition */
-    CFileDispositionType.tp_new = PyType_GenericNew;
-    if (PyType_Ready(&CFileDispositionType) < 0) {
-        Py_DECREF(mod);
-        Py_DECREF(&CTracerType);
-        return NULL;
-    }
-
-    Py_INCREF(&CFileDispositionType);
-    if (PyModule_AddObject(mod, "CFileDisposition", (PyObject *)&CFileDispositionType) < 0) {
-        Py_DECREF(mod);
-        Py_DECREF(&CTracerType);
-        Py_DECREF(&CFileDispositionType);
-        return NULL;
-    }
-
-    return mod;
-}
-
-#else
-
-void
-inittracer(void)
-{
-    PyObject * mod;
-
-    mod = Py_InitModule3("coverage.tracer", NULL, MODULE_DOC);
-    if (mod == NULL) {
-        return;
-    }
-
-    if (intern_strings() < 0) {
-        return;
-    }
-
-    /* Initialize CTracer */
-    CTracerType.tp_new = PyType_GenericNew;
-    if (PyType_Ready(&CTracerType) < 0) {
-        return;
-    }
-
-    Py_INCREF(&CTracerType);
-    PyModule_AddObject(mod, "CTracer", (PyObject *)&CTracerType);
-
-    /* Initialize CFileDisposition */
-    CFileDispositionType.tp_new = PyType_GenericNew;
-    if (PyType_Ready(&CFileDispositionType) < 0) {
-        return;
-    }
-
-    Py_INCREF(&CFileDispositionType);
-    PyModule_AddObject(mod, "CFileDisposition", (PyObject *)&CFileDispositionType);
-}
-
-#endif /* Py3k */