import sys

import numpy as np
import pytest

import aesara.tensor as at
from aesara.compile.debugmode import (
    BadDestroyMap,
    BadThunkOutput,
    BadViewMap,
    DebugMode,
    InvalidValueError,
    StochasticOrder,
)
from aesara.compile.function import function
from aesara.compile.mode import predefined_modes
from aesara.configdefaults import config
from aesara.graph.basic import Apply, Variable
from aesara.graph.features import BadOptimization
from aesara.graph.op import Op
from aesara.graph.rewriting.basic import node_rewriter
from aesara.graph.rewriting.db import EquilibriumDB
from aesara.link.c.op import COp
from aesara.tensor.math import add, dot, log
from aesara.tensor.type import TensorType, dvector, fmatrix, fvector, scalar, vector
from tests import unittest_tools as utt


def test_debugmode_basic():
    x = dvector()
    f = function([x], ((2.0 * x) + 7) / 2.0, mode=DebugMode())
    f([1, 2])


class BROKEN_ON_PURPOSE_Add(COp):

    __props__ = ("py_offset",)

    def __init__(self, py_offset):
        super().__init__()
        self.py_offset = py_offset

    def make_node(self, a, b):
        a = at.as_tensor_variable(a)
        b = at.as_tensor_variable(b)
        assert a.type.dtype == "float64"
        assert a.type.dtype == b.type.dtype
        assert a.type.ndim == 1
        r = Apply(self, [a, b], [a.type()])
        return r

    def perform(self, node, inp, out_):
        a, b = inp
        (out,) = out_
        z = a + b
        # ERROR TO ADD THIS CRAPPY OFFSET
        if self.py_offset:
            out[0] = z + 0.5
        else:
            out[0] = z

    def c_code_cache_version(self):
        return (1,)

    def c_code(self, node, name, inp, out, sub):
        a, b = inp
        (z,) = out
        return """
        if (PyArray_NDIM(%(a)s) != 1) {PyErr_SetString(PyExc_NotImplementedError, "rank(a) != 1"); %(fail)s;}
        if (PyArray_NDIM(%(b)s) != 1) {PyErr_SetString(PyExc_NotImplementedError, "rank(b) != 1"); %(fail)s;}

        if (PyArray_DESCR(%(a)s)->type_num != NPY_DOUBLE)
        {PyErr_SetString(PyExc_NotImplementedError, "a dtype not NPY_DOUBLE"); %(fail)s;}

        if (PyArray_DESCR(%(b)s)->type_num != NPY_DOUBLE)
        {PyErr_SetString(PyExc_NotImplementedError, "b's dtype not NPY_DOUBLE"); %(fail)s;}

        if (PyArray_DIMS(%(a)s)[0] != PyArray_DIMS(%(b)s)[0])
        {PyErr_SetString(PyExc_NotImplementedError, "a and b have different lengths"); %(fail)s;}

        if ((!%(z)s)
            || (PyArray_DIMS(%(z)s)[0] != PyArray_DIMS(%(b)s)[0])
            )
        {
            {Py_XDECREF(%(z)s);}
            npy_intp dims[] = {0};
            dims[0] = PyArray_DIMS(%(b)s)[0];
            %(z)s = (PyArrayObject*) PyArray_SimpleNew(1, dims, PyArray_DESCR(%(b)s)->type_num);
        }

        {
            for (npy_intp m = 0; m < PyArray_DIMS(%(z)s)[0]; ++m)
            {
                ((double*)PyArray_GETPTR1(%(z)s, m))[0]
                = 0.5
                + ((double*)PyArray_GETPTR1(%(a)s, m))[0]
                + ((double*)PyArray_GETPTR1(%(b)s, m))[0] ;
            }
        }
        """ % dict(
            locals(), **sub
        )


# inconsistent is a invalid op, whose perform and c_code do not match
inconsistent = BROKEN_ON_PURPOSE_Add(False)

# off_by_half is a good op, that is different from aesara.sparse.sd_csc
off_by_half = BROKEN_ON_PURPOSE_Add(True)


class WeirdBrokenOp(COp):
    """
    This op can be inplace if behaviour is 'times1_inplace'
    This op can be destructive if behaviour is 'times2_inplace'

    In both cases, it does not set the destroy_map or view_map correctly so
    it should raise an error in DebugMode.
    """

    __props__ = ("behaviour",)

    def __init__(self, behaviour):
        super().__init__()
        self.behaviour = behaviour

    def make_node(self, a):
        a_ = at.as_tensor_variable(a)
        r = Apply(self, [a_], [a_.type()])
        return r

    def perform(*args, **kwargs):
        raise NotImplementedError()

    def dontuse_perform(self, node, inp, out_):
        (a,) = inp
        (out,) = out_
        if self.behaviour == "times2":
            out[0] = a * 2
        elif self.behaviour == "times2_inplace":
            out[0] = a
            out[0] *= 2
        elif self.behaviour == "times1":
            out[0] = a * 1
        elif self.behaviour == "times1_inplace":
            out[0] = a
        else:
            raise ValueError(self.behaviour)

    def c_code_cache_version(self):
        return (1,)

    def c_code(self, node, name, inp, out, sub):
        (a,) = inp
        (z,) = out
        if "inplace" in self.behaviour:
            z_code = """
            {Py_XDECREF(%(z)s);}
            Py_INCREF(%(a)s);
            %(z)s = %(a)s;
            """
        else:
            z_code = """
            {Py_XDECREF(%(z)s);}
            %(z)s = (PyArrayObject*) PyArray_SimpleNew(1, PyArray_DIMS(%(a)s), PyArray_DESCR(%(a)s)->type_num);
            """
        prep_vars = """
            //the output array has size M x N
            npy_intp M = PyArray_DIMS(%(a)s)[0];
            npy_intp Sa = PyArray_STRIDES(%(a)s)[0] / PyArray_DESCR(%(a)s)->elsize;
            npy_intp Sz = PyArray_STRIDES(%(z)s)[0] / PyArray_DESCR(%(z)s)->elsize;

            npy_double * Da = (npy_double*)PyArray_BYTES(%(a)s);
            npy_double * Dz = (npy_double*)PyArray_BYTES(%(z)s);

            //clear the output array
            for (npy_intp m = 0; m < M; ++m)
            {
        """

        if self.behaviour == "times2":
            behaviour = "     Dz[m * Sz] = 2 * Da[m * Sa]; "
            # out[0] = a * 2
        elif self.behaviour == "times2_inplace":
            # out[0] = a
            # out[0] *= 2
            behaviour = "     Dz[m * Sz] = 2 * Da[m * Sa]; "
        elif self.behaviour == "times1":
            # out[0] = a * 1
            behaviour = "     Dz[m * Sz] = Da[m * Sa]; "
        elif self.behaviour == "times1_inplace":
            # out[0] = a
            behaviour = ""
        else:
            raise ValueError(self.behaviour)

        prep_vars2 = """
            }
        """

        total = (z_code + prep_vars + behaviour + prep_vars2) % dict(locals(), **sub)
        return total


wb2i = WeirdBrokenOp("times2_inplace")
wb2 = WeirdBrokenOp("times2")
wb1i = WeirdBrokenOp("times1_inplace")
wb1 = WeirdBrokenOp("times1")


@pytest.mark.skipif(
    not config.cxx, reason="G++ not available, so we need to skip this test."
)
def test_badthunkoutput():
    # Check if the c and python code is consistent.
    a = dvector()
    b = dvector()

    f_good = function(
        [a, b],
        off_by_half(a, b),
        mode=DebugMode(check_c_code=config.cxx),
    )
    f_inconsistent = function(
        [a, b],
        inconsistent(a, b),
        mode=DebugMode(check_c_code=config.cxx),
    )

    # this should evaluate with no error
    f_good([1.0, 2.0, 3.0], [2, 3, 4])

    with pytest.raises(BadThunkOutput) as einfo:
        f_inconsistent([1.0, 2.0, 3.0], [2, 3, 4])

    assert einfo.value.r.owner.op is inconsistent


def test_badoptimization():
    @node_rewriter([add])
    def insert_broken_add(fgraph, node):
        if node.op == add:
            return [off_by_half(*node.inputs)]
        return False

    edb = EquilibriumDB()
    edb.register("insert_broken_add", insert_broken_add, "all")
    opt = edb.query("+all")

    a = dvector()
    b = dvector()

    f = function([a, b], a + b, mode=DebugMode(optimizer=opt))

    with pytest.raises(BadOptimization) as einfo:
        f(
            [1.0, 2.0, 3.0],
            [2, 3, 4],
        )
    assert str(einfo.value.reason) == "insert_broken_add"


def test_badoptimization_opt_err():
    # This variant of test_badoptimization() replace the working code
    # with a new apply node that will raise an error.
    @node_rewriter([add])
    def insert_bigger_b_add(fgraph, node):
        if node.op == add:
            inputs = list(node.inputs)
            if inputs[-1].owner is None:
                inputs[-1] = at.concatenate((inputs[-1], inputs[-1]))
                return [node.op(*inputs)]
        return False

    @node_rewriter([add])
    def insert_bad_dtype(fgraph, node):
        if node.op == add:
            inputs = list(node.inputs)
            if inputs[-1].owner is None:

                return [node.outputs[0].astype("float32")]
        return False

    edb = EquilibriumDB()
    edb.register("insert_bigger_b_add", insert_bigger_b_add, "all")
    opt = edb.query("+all")
    edb2 = EquilibriumDB()
    edb2.register("insert_bad_dtype", insert_bad_dtype, "all")
    opt2 = edb2.query("+all")

    a = dvector()
    b = dvector()

    f = function([a, b], a + b, mode=DebugMode(optimizer=opt))
    with pytest.raises(ValueError, match=r"insert_bigger_b_add"):
        f(
            [1.0, 2.0, 3.0],
            [2, 3, 4],
        )

    # Test that opt that do an illegal change still get the error from graph.
    with pytest.raises(TypeError) as einfo:
        with config.change_flags(on_opt_error="raise"):
            f2 = function(
                [a, b],
                a + b,
                mode=DebugMode(optimizer=opt2, stability_patience=1),
            )
        f2(
            [1.0, 2.0, 3.0],
            [2, 3, 4],
        )

    # Test that we can reraise the error with an extended message
    with pytest.raises(TypeError):
        e = einfo.value
        new_e = e.__class__("TTT" + str(e))
        exc_type, exc_value, exc_trace = sys.exc_info()
        exc_value = new_e
        raise exc_value.with_traceback(exc_trace)


def test_stochasticoptimization():

    # this optimization alternates between triggering and not triggering.

    last_time_replaced = [False]

    @node_rewriter([add])
    def insert_broken_add_sometimes(fgraph, node):
        if node.op == add:
            last_time_replaced[0] = not last_time_replaced[0]
            if last_time_replaced[0]:
                return [off_by_half(*node.inputs)]
        return False

    edb = EquilibriumDB()
    edb.register("insert_broken_add_sometimes", insert_broken_add_sometimes, "all")
    opt = edb.query("+all")

    a = dvector()
    b = dvector()

    with pytest.raises(StochasticOrder):
        function(
            [a, b],
            add(a, b),
            mode=DebugMode(
                optimizer=opt,
                check_c_code=True,
                stability_patience=max(2, config.DebugMode__patience),
            ),
        )


@pytest.mark.skipif(
    not config.cxx, reason="G++ not available, so we need to skip this test."
)
def test_just_c_code():
    x = dvector()
    f = function([x], wb2(x), mode=DebugMode(check_py_code=False))
    assert np.all(f([1, 2]) == [2, 4])


def test_baddestroymap():
    class BadAdd(Op):
        def make_node(self, a, b):
            c = a.type()
            return Apply(self, [a, b], [c])

        def perform(self, node, inp, out):
            a, b = inp
            (c,) = out
            c[0] = a
            c[0] += b

    x = dvector()
    y = dvector()
    f = function([x, y], BadAdd()(x, y), mode="DEBUG_MODE")

    with pytest.raises(BadDestroyMap):
        f([1, 2], [3, 4])


@pytest.mark.skipif(
    not config.cxx, reason="G++ not available, so we need to skip this test."
)
def test_baddestroymap_c():
    x = dvector()
    f = function([x], wb2i(x), mode=DebugMode(check_py_code=False))
    with pytest.raises(BadDestroyMap):
        assert np.all(f([1, 2]) == [2, 4])


class TestViewMap:
    class BadAddRef(Op):
        def make_node(self, a, b):
            c = b.type()
            return Apply(self, [a, b], [c])

        def perform(self, node, inp, out):
            a, b = inp
            (c,) = out
            c[0] = b

    class BadAddSlice(Op):
        def make_node(self, a, b):
            c = b.type()
            return Apply(self, [a, b], [c])

        def perform(self, node, inp, out):
            a, b = inp
            (c,) = out
            c[0] = b[1:3]

    def test_badviewmap_ref(self):
        x = dvector()
        y = dvector()
        f = function([x, y], self.BadAddRef()(x, y), mode="DEBUG_MODE")
        with pytest.raises(BadViewMap):
            f([1, 2], [3, 4])

    def test_badviewmap_slice(self):
        x = dvector()
        y = dvector()
        f = function([x, y], self.BadAddSlice()(x, y), mode="DEBUG_MODE")
        with pytest.raises(BadViewMap):
            f([1, 2], [3, 4])

    def test_goodviewmap(self):
        goodop = self.BadAddRef()
        goodop.view_map = {0: [1]}
        x = dvector()
        y = dvector()
        f = function([x, y], goodop(x, y), mode="DEBUG_MODE")
        # Shouldn't raise an error
        f([1, 5, 1], [3, 4, 2, 1, 4])

    @pytest.mark.skipif(
        not config.cxx, reason="G++ not available, so we need to skip this test."
    )
    def test_badviewmap_c(self):
        x = dvector()
        f = function([x], wb1i(x), mode=DebugMode(check_py_code=False))
        with pytest.raises(BadViewMap):
            f([1, 2])

    def test_aliased_outputs_ok(self):
        # here aliased outputs is ok because they are both aliased to an input
        # as well
        class CustomOp(Op):
            view_map = {0: [0], 1: [0]}

            def make_node(self, a, b):
                c = a.type()
                d = a.type()
                return Apply(self, [a, b], [c, d])

            def perform(self, node, inp, out):
                a, b = inp
                c, d = out
                c[0] = a
                d[0] = a[1:]

        x = dvector("x")
        y = dvector("y")
        f = function([x, y], CustomOp()(x, y), mode="DEBUG_MODE")

        r0, r1 = f([1, 2, 3, 4], [5, 6, 7, 8])

        assert np.all(r0 == [1, 2, 3, 4])
        assert np.all(r1 == [2, 3, 4])

    def test_aliased_outputs_ok_output(self):
        # here aliased outputs is ok because they are both outputs of the
        # function as a whole and thus not destroy-able
        class CustomOp(Op):
            def make_node(self, a, b):
                c = a.type()
                d = a.type()
                return Apply(self, [a, b], [c, d])

            def perform(self, node, inp, out):
                a, b = inp
                c, d = out
                r = a * 2
                c[0] = r
                d[0] = r[1:]

        x = dvector()
        y = dvector()
        f = function([x, y], CustomOp()(x, y), mode="DEBUG_MODE")

        r0, r1 = f([1, 2, 3, 4], [5, 6, 7, 8])

        assert np.all(r0 == [2, 4, 6, 8])
        assert np.all(r1 == [4, 6, 8])

    def test_aliased_outputs_ok_shadow(self):
        # here the alias between outputs is ok because one of them is not used
        # for subsequent computation.  This is like the case where we use one
        # output as a memory buffer to serve another output.
        class CustomOp(Op):
            def make_node(self, a, b):
                c = a.type()
                d = a.type()
                return Apply(self, [a, b], [c, d])

            def perform(self, node, inp, out):
                a, b = inp
                c, d = out
                r = a * 1
                c[0] = r
                d[0] = r[1:]

        x = dvector("x")
        y = dvector("y")
        f = function([x, y], CustomOp()(x, y)[0] * 2, mode="DEBUG_MODE")

        r0 = f([1, 2, 3, 4], [5, 6, 7, 8])

        assert np.all(r0 == [2, 4, 6, 8])

    def test_aliased_outputs_bad(self):
        # here the alias between outputs is not ok because destroying one
        # destroys the other, but there's no way to warn aesara about it
        # through the view_map mechanism.
        class CustomOp(Op):
            def make_node(self, a, b):
                c = a.type()
                d = a.type()
                return Apply(self, [a, b], [c, d])

            def perform(self, node, inp, out):
                a, b = inp
                c, d = out
                r = a * 1
                c[0] = r[:-1]
                d[0] = r[1:]

        custom_op = CustomOp()

        x = dvector()
        y = dvector()
        bad_xy0, bad_xy1 = custom_op(x, y)
        out = bad_xy0 * 2 + bad_xy1 * 2
        f = function([x, y], out, mode="DEBUG_MODE")

        with pytest.raises(BadViewMap):
            f([1, 2, 3, 4], [5, 6, 7, 8])

        # the situation can be rescued by picking one of the inputs and
        # pretending that it is aliased to both the outputs.
        # This unfairly disables any destructive operations on the
        # input, but guarantees correctness.
        # custom_op.view_map = {0:[0], 1:[1]}
        # f([1,2,3,4],[5,6,7,8])


class TestCheckIsfinite:
    def setup_method(self):
        self.old_ts = TensorType.filter_checks_isfinite
        self.old_dm = predefined_modes["DEBUG_MODE"].check_isfinite

    def teardown_method(self):
        TensorType.filter_checks_isfinite = self.old_ts
        predefined_modes["DEBUG_MODE"].check_isfinite = self.old_dm

    def test_check_isfinite(self):
        x = vector()
        f = function([x], (x + 2) * 5, mode="DEBUG_MODE")
        g = function([x], log(x), mode="DEBUG_MODE")

        # this should work
        f(np.log([3, 4, 5]).astype(config.floatX))

        # if TensorType.filter_checks_isfinite were true, these would raise
        # ValueError
        # if not, DebugMode will check internally, and raise InvalidValueError
        # passing an invalid value as an input should trigger ValueError
        with pytest.raises(InvalidValueError):
            f(np.log([3, -4, 5]).astype(config.floatX))
        with pytest.raises(InvalidValueError):
            f((np.asarray([0, 1.0, 0]) / 0).astype(config.floatX))
        with pytest.raises(InvalidValueError):
            f((np.asarray([1.0, 1.0, 1.0]) / 0).astype(config.floatX))

        # generating an invalid value internally should trigger
        # InvalidValueError
        with pytest.raises(InvalidValueError):
            g(np.asarray([3, -4, 5], dtype=config.floatX))

        # this should disable the exception
        TensorType.filter_checks_isfinite = False
        predefined_modes["DEBUG_MODE"].check_isfinite = False
        # insert several Inf
        f(np.asarray(np.asarray([1.0, 1.0, 1.0]) / 0, dtype=config.floatX))

    def test_check_isfinite_disabled(self):
        x = dvector()
        f = function([x], (x + 2) * 5, mode=DebugMode(check_isfinite=False))

        # nan should go through
        f(np.log([3, -4, 5]))

        # inf should go through
        infs = np.asarray([1.0, 1.0, 1.0]) / 0
        # print infs
        f(infs)
        return


class BrokenCImplementationAdd(COp):

    __props__ = ()

    def make_node(self, a, b):
        a = at.as_tensor_variable(a)
        b = at.as_tensor_variable(b)
        assert a.type.dtype == "float32"
        assert a.type.dtype == b.type.dtype
        assert a.type.ndim == 2
        r = Apply(self, [a, b], [a.type()])
        return r

    def perform(self, node, inp, out_):
        # print 'executing python perform'
        a, b = inp
        (out,) = out_
        z = a + b
        # print 'out[0] was:', out[0]
        out[0] = z

    def c_code_cache_version(self):
        return (1,)

    def c_code(self, node, name, inp, out, sub):
        a, b = inp
        (z,) = out
        debug = 0
        return """
        //printf("executing c_code\\n");
        if (PyArray_NDIM(%(a)s) != 2) {PyErr_SetString(PyExc_NotImplementedError, "rank(a) != 2"); %(fail)s;}
        if (PyArray_NDIM(%(b)s) != 2) {PyErr_SetString(PyExc_NotImplementedError, "rank(b) != 2"); %(fail)s;}

        if (PyArray_DESCR(%(a)s)->type_num != NPY_FLOAT)
        {PyErr_SetString(PyExc_NotImplementedError, "a dtype not NPY_FLOAT"); %(fail)s;}

        if (PyArray_DESCR(%(b)s)->type_num != NPY_FLOAT)
        {PyErr_SetString(PyExc_NotImplementedError, "b's dtype not NPY_FLOAT"); %(fail)s;}

        if (PyArray_DIMS(%(a)s)[0] != PyArray_DIMS(%(a)s)[1])
        {PyErr_SetString(PyExc_NotImplementedError, "a is not square"); %(fail)s;}

        if (PyArray_DIMS(%(b)s)[0] != PyArray_DIMS(%(b)s)[1])
        {PyErr_SetString(PyExc_NotImplementedError, "b is not square"); %(fail)s;}

        if (PyArray_DIMS(%(a)s)[0] != PyArray_DIMS(%(b)s)[0])
        {PyErr_SetString(PyExc_NotImplementedError, "a and b have different dimensions"); %(fail)s;}

        // We do not check for c_contiguous property here
        if (%(debug)s)
        {
            if (!%(z)s)
                printf("%(z)s is not there, %%p \\n", %(z)s);
            else if (PyArray_DIMS(%(z)s)[0] != PyArray_DIMS(%(b)s)[0])
                printf("Dimension 0 mismatch for %(z)s and %(b)s\\n");
            else if (PyArray_DIMS(%(z)s)[1] != PyArray_DIMS(%(b)s)[1])
                printf("Dimension 1 mismatch for %(z)s and %(b)s\\n");
            else
                printf("Reusing %(z)s\\n");
        }

        if ((!%(z)s)
            || (PyArray_DIMS(%(z)s)[0] != PyArray_DIMS(%(b)s)[0])
            || (PyArray_DIMS(%(z)s)[1] != PyArray_DIMS(%(b)s)[1])
            )
        {
            Py_XDECREF(%(z)s);
            npy_intp dims[] = {0, 0};
            dims[0] = PyArray_DIMS(%(b)s)[0];
            dims[1] = PyArray_DIMS(%(b)s)[1];
            %(z)s = (PyArrayObject*) PyArray_SimpleNew(2, dims, PyArray_DESCR(%(b)s)->type_num);
        }

        // Let us assume that %(z)s is c_contiguous
        {
            dtype_%(z)s * z = ((dtype_%(z)s*)(PyArray_GETPTR2(%(z)s,0,0)));
            for (int i=0; i<PyArray_DIMS(%(b)s)[0]; i++)
            {
                for (int j=0; j<PyArray_DIMS(%(b)s)[1]; j++)
                {
                    *z = ((float*)PyArray_GETPTR2(%(a)s, i, j))[0] +
                         ((float*)PyArray_GETPTR2(%(b)s, i, j))[0] ;
                    z++;
                }
            }
        }
        """ % dict(
            locals(), **sub
        )


class VecAsRowAndCol(Op):
    """
    Transforms a vector into a row and a column.

    This Op exists to check everything is correct when an Op has
    two outputs with different broadcasting patterns.
    """

    __props__ = ()

    def make_node(self, v):
        if not isinstance(v, Variable):
            v = at.as_tensor_variable(v)
        assert v.type.ndim == 1
        type_class = type(v.type)
        out_r_type = type_class(dtype=v.dtype, shape=(True, False))
        out_c_type = type_class(dtype=v.dtype, shape=(False, True))
        return Apply(self, [v], [out_r_type(), out_c_type()])

    def perform(self, node, inp, out):
        (v,) = inp
        r, c = out
        lv = v.shape[0]
        if (r[0] is None) or (r[0].shape != (1, lv)):
            r[0] = node.outputs[0].type.value_zeros((1, lv))

        if (c[0] is None) or (c[0].shape != (lv, 1)):
            c[0] = node.outputs[1].type.value_zeros((lv, 1))

        for i in range(lv):
            r[0][0, i] = v[i]
            c[0][i, 0] = v[i]


class TestPreallocatedOutput:
    def setup_method(self):
        self.rng = np.random.default_rng(seed=utt.fetch_seed())

    def test_f_contiguous(self):
        a = fmatrix("a")
        b = fmatrix("b")
        z = BrokenCImplementationAdd()(a, b)
        # In this test, we do not want z to be an output of the graph.
        out = dot(z, np.eye(7))

        a_val = self.rng.standard_normal((7, 7)).astype("float32")
        b_val = self.rng.standard_normal((7, 7)).astype("float32")

        # Should work
        mode = DebugMode(check_preallocated_output=["c_contiguous"])

        f = function([a, b], out, mode=mode)
        f(a_val, b_val)
        # print 'out_val =', out_val
        # print out_val.strides

        # Should raise an Exception, since the output buffer is
        # used incorrectly.
        mode = DebugMode(check_preallocated_output=["f_contiguous"])

        f = function([a, b], out, mode=mode)

        if config.cxx:
            with pytest.raises(BadThunkOutput):
                f(a_val, b_val)
        else:
            # The python code of this op is good.
            f(a_val, b_val)

    def test_f_contiguous_out(self):
        # Same test as test_f_contiguous, but check that it works
        # even if z _is_ the output of the graph
        a = fmatrix("a")
        b = fmatrix("b")
        out = BrokenCImplementationAdd()(a, b)

        a_val = self.rng.standard_normal((7, 7)).astype("float32")
        b_val = self.rng.standard_normal((7, 7)).astype("float32")

        # Should work
        mode = DebugMode(check_preallocated_output=["c_contiguous"])

        f = function([a, b], out, mode=mode)
        f(a_val, b_val)
        # print 'out_val =', out_val
        # print out_val.strides

        # Should raise an Exception, since the output buffer is
        # used incorrectly.
        mode = DebugMode(check_preallocated_output=["f_contiguous"])

        f = function([a, b], out, mode=mode)

        if config.cxx:
            with pytest.raises(BadThunkOutput):
                f(a_val, b_val)
        else:
            # The python code of this op is good.
            f(a_val, b_val)

    def test_output_broadcast_tensor(self):
        v = fvector("v")
        c, r = VecAsRowAndCol()(v)
        f = function([v], [c, r])

        v_val = self.rng.standard_normal((5)).astype("float32")
        f(v_val)


def test_function_dict():
    """Tests that debug mode works where outputs is a dictionary."""

    x = scalar("x")

    f = function([x], outputs={"1": x, "2": 2 * x, "3": 3 * x}, mode="DEBUG_MODE")

    result = f(3.0)

    assert result["1"] == 3.0
    assert result["2"] == 6.0
    assert result["3"] == 9.0


def test_function_list():
    """Tests that debug mode works where the outputs argument is a list."""

    x = scalar("x")

    f = function([x], outputs=[x, 2 * x, 3 * x], mode="DEBUG_MODE")

    result = f(5.0)

    assert result[0] == 5.0
    assert result[1] == 10.0
    assert result[2] == 15.0
