from __future__ import print_function, absolute_import

import ctypes
from ctypes import *
from ctypes.util import find_library
import gc
import locale
import os
import platform
import re
import subprocess
import sys
import unittest

from llvmlite import six, ir
from llvmlite import binding as llvm
from llvmlite.binding import ffi
from . import TestCase


def no_de_locale():
    cur = locale.setlocale(locale.LC_ALL)
    try:
        locale.setlocale(locale.LC_ALL, 'de_DE')
    except locale.Error:
        return True
    else:
        return False
    finally:
        locale.setlocale(locale.LC_ALL, cur)


asm_sum = r"""
    ; ModuleID = '<string>'
    target triple = "{triple}"

    @glob = global i32 0
    @glob_b = global i8 0
    @glob_f = global float 1.5
    @glob_struct = global {{ i64, [2 x i64]}} {{i64 0, [2 x i64] [i64 0, i64 0]}}

    define i32 @sum(i32 %.1, i32 %.2) {{
      %.3 = add i32 %.1, %.2
      %.4 = add i32 0, %.3
      ret i32 %.4
    }}
    """

asm_sum2 = r"""
    ; ModuleID = '<string>'
    target triple = "{triple}"

    define i32 @sum(i32 %.1, i32 %.2) {{
      %.3 = add i32 %.1, %.2
      ret i32 %.3
    }}
    """

asm_mul = r"""
    ; ModuleID = '<string>'
    target triple = "{triple}"

    define i32 @mul(i32 %.1, i32 %.2) {{
      %.3 = mul i32 %.1, %.2
      ret i32 %.3
    }}
    """

# `fadd` used on integer inputs
asm_parse_error = r"""
    ; ModuleID = '<string>'
    target triple = "{triple}"

    define i32 @sum(i32 %.1, i32 %.2) {{
      %.3 = fadd i32 %.1, %.2
      ret i32 %.3
    }}
    """

# "%.bug" definition references itself
asm_verification_fail = r"""
    ; ModuleID = '<string>'
    target triple = "{triple}"

    define void @sum() {{
      %.bug = add i32 1, %.bug
      ret void
    }}
    """

asm_sum_declare = r"""
    ; ModuleID = '<string>'
    target triple = "{triple}"

    declare i32 @sum(i32 %.1, i32 %.2)
    """


asm_double_locale = r"""
    ; ModuleID = '<string>'
    target triple = "{triple}"

    define void @foo() {{
      %const = fadd double 0.0, 3.14
      ret void
    }}
    """

class BaseTest(TestCase):

    def setUp(self):
        llvm.initialize()
        llvm.initialize_native_target()
        llvm.initialize_native_asmprinter()
        gc.collect()
        self.old_garbage = gc.garbage[:]
        gc.garbage[:] = []

    def tearDown(self):
        # Test that no uncollectable objects were created
        # (llvmlite objects have a __del__ so a reference cycle could
        # create some).
        gc.collect()
        self.assertEqual(gc.garbage, [])
        # This will probably put any existing garbage in gc.garbage again
        del self.old_garbage

    def module(self, asm=asm_sum):
        asm = asm.format(triple=llvm.get_default_triple())
        mod = llvm.parse_assembly(asm)
        return mod

    def glob(self, name='glob', mod=None):
        if mod is None:
            mod = self.module()
        return mod.get_global_variable(name)

    def target_machine(self):
        target = llvm.Target.from_default_triple()
        return target.create_target_machine()


class TestDependencies(BaseTest):
    """
    Test DLL dependencies are within a certain expected set.
    """

    @unittest.skipUnless(sys.platform.startswith('linux'), "Linux-specific test")
    def test_linux(self):
        lib_path = ffi.lib._name
        env = os.environ.copy()
        env['LANG'] = 'C'
        p = subprocess.Popen(["objdump", "-p", lib_path],
                             stdout=subprocess.PIPE, env=env)
        out, _ = p.communicate()
        self.assertEqual(0, p.returncode)
        # Parse library dependencies
        lib_pat = re.compile(r'^([-_a-zA-Z0-9]+)\.so(?:\.\d+)?$')
        deps = set()
        for line in out.decode().splitlines():
            parts = line.split()
            if parts and parts[0] == 'NEEDED':
                dep = parts[1]
                m = lib_pat.match(dep)
                if len(parts) != 2 or not m:
                    self.fail("invalid NEEDED line: %r" % (line,))
                deps.add(m.group(1))
        # Sanity check that our dependencies were parsed ok
        if 'libc' not in deps or 'libpthread' not in deps:
            self.fail("failed parsing dependencies? got %r" % (deps,))
        # Ensure all dependencies are expected
        allowed = set(['librt', 'libdl', 'libpthread', 'libz', 'libm',
                       'libgcc_s', 'libc', 'ld-linux'])
        for dep in deps:
            if not dep.startswith('ld-linux-') and dep not in allowed:
                self.fail("unexpected dependency %r in %r" % (dep, deps))


class TestMisc(BaseTest):
    """
    Test miscellaneous functions in llvm.binding.
    """

    def test_parse_assembly(self):
        self.module(asm_sum)

    def test_parse_assembly_error(self):
        with self.assertRaises(RuntimeError) as cm:
            self.module(asm_parse_error)
        s = str(cm.exception)
        self.assertIn("parsing error", s)
        self.assertIn("invalid operand type", s)

    def test_dylib_symbols(self):
        llvm.add_symbol("__xyzzy", 1234)
        llvm.add_symbol("__xyzzy", 5678)
        addr = llvm.address_of_symbol("__xyzzy")
        self.assertEqual(addr, 5678)
        addr = llvm.address_of_symbol("__foobar")
        self.assertIs(addr, None)

    def test_get_default_triple(self):
        triple = llvm.get_default_triple()
        self.assertIsInstance(triple, str)
        self.assertTrue(triple)

    def test_get_process_triple(self):
        triple = llvm.get_process_triple()
        default = llvm.get_default_triple()
        self.assertIsInstance(triple, str)
        self.assertTrue(triple)

        default_parts = default.split('-')
        triple_parts = triple.split('-')
        # Arch must be equal
        self.assertEqual(default_parts[0], triple_parts[0])

    def test_get_host_cpu_features(self):
        features = llvm.get_host_cpu_features()
        self.assertIsInstance(features, dict)
        self.assertIsInstance(features, llvm.FeatureMap)
        for k, v in features.items():
            self.assertIsInstance(k, str)
            self.assertTrue(k)  # feature string cannot be empty
            self.assertIsInstance(v, bool)
        self.assertIsInstance(features.flatten(), str)

        re_term = r"[+\-][a-zA-Z0-9\._]+"
        regex = r"^({0}|{0}(,{0})*)?$".format(re_term)
        # quick check for our regex
        self.assertIsNotNone(re.match(regex, ""))
        self.assertIsNotNone(re.match(regex, "+aa"))
        self.assertIsNotNone(re.match(regex, "+a,-bb"))
        # check CpuFeature.flatten()
        self.assertIsNotNone(re.match(regex, features.flatten()))

    def test_get_host_cpu_name(self):
        cpu = llvm.get_host_cpu_name()
        self.assertIsInstance(cpu, str)
        self.assertTrue(cpu)

    def test_initfini(self):
        code = """if 1:
            from llvmlite import binding as llvm

            llvm.initialize()
            llvm.initialize_native_target()
            llvm.initialize_native_asmprinter()
            llvm.initialize_all_targets()
            llvm.initialize_all_asmprinters()
            llvm.shutdown()
            """
        subprocess.check_call([sys.executable, "-c", code])

    def test_set_option(self):
        # We cannot set an option multiple times (LLVM would exit() the
        # process), so run the code in a subprocess.
        code = """if 1:
            from llvmlite import binding as llvm

            llvm.set_option("progname", "-debug-pass=Disabled")
            """
        subprocess.check_call([sys.executable, "-c", code])

    def test_version(self):
        major, minor, patch = llvm.llvm_version_info
        self.assertIn((major, minor), [(3, 6), (3, 7)])
        self.assertIn(patch, range(10))

    def test_check_jit_execution(self):
        llvm.check_jit_execution()

    @unittest.skipIf(no_de_locale(), "Locale not available")
    def test_print_double_locale(self):
        m = self.module(asm_double_locale)
        expect = str(m)
        # Change the locale so that comma is used as decimal-point
        # to trigger the LLVM bug (llvmlite issue #80)
        locale.setlocale(locale.LC_ALL, 'de_DE')
        # The LLVM bug is trigged by print the module with double constant
        got = str(m)
        # Changing the locale should not affect the LLVM IR
        self.assertEqual(expect, got)


class TestModuleRef(BaseTest):

    def test_str(self):
        mod = self.module()
        s = str(mod).strip()
        self.assertTrue(s.startswith('; ModuleID ='), s)

    def test_close(self):
        mod = self.module()
        str(mod)
        mod.close()
        with self.assertRaises(ctypes.ArgumentError):
            str(mod)
        mod.close()

    def test_with(self):
        mod = self.module()
        str(mod)
        with mod:
            str(mod)
        with self.assertRaises(ctypes.ArgumentError):
            str(mod)
        with self.assertRaises(RuntimeError):
            with mod:
                pass

    def test_name(self):
        mod = self.module()
        mod.name = "foo"
        self.assertEqual(mod.name, "foo")
        mod.name = "bar"
        self.assertEqual(mod.name, "bar")

    def test_data_layout(self):
        mod = self.module()
        s = mod.data_layout
        self.assertIsInstance(s, str)
        mod.data_layout = s
        self.assertEqual(s, mod.data_layout)

    def test_triple(self):
        mod = self.module()
        s = mod.triple
        self.assertEqual(s, llvm.get_default_triple())
        mod.triple = ''
        self.assertEqual(mod.triple, '')

    def test_verify(self):
        # Verify successful
        mod = self.module()
        self.assertIs(mod.verify(), None)
        # Verify failed
        mod = self.module(asm_verification_fail)
        with self.assertRaises(RuntimeError) as cm:
            mod.verify()
        s = str(cm.exception)
        self.assertIn("%.bug = add i32 1, %.bug", s)

    def test_get_function(self):
        mod = self.module()
        fn = mod.get_function("sum")
        self.assertIsInstance(fn, llvm.ValueRef)
        self.assertEqual(fn.name, "sum")

        with self.assertRaises(NameError):
            mod.get_function("foo")

        # Check that fn keeps the module instance alive
        del mod
        str(fn.module)

    def test_get_global_variable(self):
        mod = self.module()
        gv = mod.get_global_variable("glob")
        self.assertIsInstance(gv, llvm.ValueRef)
        self.assertEqual(gv.name, "glob")

        with self.assertRaises(NameError):
            mod.get_global_variable("bar")

        # Check that gv keeps the module instance alive
        del mod
        str(gv.module)

    def test_global_variables(self):
        mod = self.module()
        it = mod.global_variables
        del mod
        globs = sorted(it, key=lambda value: value.name)
        self.assertEqual(len(globs), 4)
        self.assertEqual([g.name for g in globs],
                         ["glob", "glob_b", "glob_f", "glob_struct"])

    def test_functions(self):
        mod = self.module()
        it = mod.functions
        del mod
        funcs = list(it)
        self.assertEqual(len(funcs), 1)
        self.assertEqual(funcs[0].name, "sum")

    def test_link_in(self):
        dest = self.module()
        src = self.module(asm_mul)
        dest.link_in(src)
        self.assertEqual(sorted(f.name for f in dest.functions), ["mul", "sum"])
        dest.get_function("mul")
        dest.close()
        with self.assertRaises(ctypes.ArgumentError):
            src.get_function("mul")

    def test_link_in_preserve(self):
        dest = self.module()
        src2 = self.module(asm_mul)
        dest.link_in(src2, preserve=True)
        self.assertEqual(sorted(f.name for f in dest.functions), ["mul", "sum"])
        dest.close()
        self.assertEqual(sorted(f.name for f in src2.functions), ["mul"])
        src2.get_function("mul")

    def test_link_in_error(self):
        # Raise an error by trying to link two modules with the same global
        # definition "sum".
        dest = self.module()
        src = self.module(asm_sum2)
        with self.assertRaises(RuntimeError) as cm:
            dest.link_in(src)
        self.assertIn("symbol multiply defined", str(cm.exception))

    def test_as_bitcode(self):
        mod = self.module()
        bc = mod.as_bitcode()
        # Refer to http://llvm.org/docs/doxygen/html/ReaderWriter_8h_source.html#l00064
        # and http://llvm.org/docs/doxygen/html/ReaderWriter_8h_source.html#l00092
        bitcode_wrapper_magic = b'\xde\xc0\x17\x0b'
        bitcode_magic = b'BC'
        self.assertTrue(bc.startswith(bitcode_magic) or
                        bc.startswith(bitcode_wrapper_magic))

    def test_parse_bitcode_error(self):
        with self.assertRaises(RuntimeError) as cm:
            llvm.parse_bitcode(b"")
        self.assertIn("LLVM bitcode parsing error", str(cm.exception))
        self.assertIn("Invalid bitcode signature", str(cm.exception))

    def test_bitcode_roundtrip(self):
        bc = self.module().as_bitcode()
        mod = llvm.parse_bitcode(bc)
        self.assertEqual(mod.as_bitcode(), bc)
        mod.get_function("sum")
        mod.get_global_variable("glob")

    def test_cloning(self):
        m = self.module()
        cloned = m.clone()
        self.assertIsNot(cloned, m)
        self.assertEqual(cloned.as_bitcode(), m.as_bitcode())


class JITTestMixin(object):
    """
    Mixin for ExecutionEngine tests.
    """

    def get_sum(self, ee, func_name="sum"):
        ee.finalize_object()
        cfptr = ee.get_function_address(func_name)
        self.assertTrue(cfptr)
        return CFUNCTYPE(c_int, c_int, c_int)(cfptr)

    def test_run_code(self):
        mod = self.module()
        with self.jit(mod) as ee:
            cfunc = self.get_sum(ee)
            res = cfunc(2, -5)
            self.assertEqual(-3, res)

    def test_close(self):
        ee = self.jit(self.module())
        ee.close()
        ee.close()
        with self.assertRaises(ctypes.ArgumentError):
            ee.finalize_object()

    def test_with(self):
        ee = self.jit(self.module())
        with ee:
            pass
        with self.assertRaises(RuntimeError):
            with ee:
                pass
        with self.assertRaises(ctypes.ArgumentError):
            ee.finalize_object()

    def test_module_lifetime(self):
        mod = self.module()
        ee = self.jit(mod)
        ee.close()
        mod.close()

    def test_module_lifetime2(self):
        mod = self.module()
        ee = self.jit(mod)
        mod.close()
        ee.close()

    def test_add_module(self):
        ee = self.jit(self.module())
        mod = self.module(asm_mul)
        ee.add_module(mod)
        with self.assertRaises(KeyError):
            ee.add_module(mod)
        self.assertFalse(mod.closed)
        ee.close()
        self.assertTrue(mod.closed)

    def test_add_module_lifetime(self):
        ee = self.jit(self.module())
        mod = self.module(asm_mul)
        ee.add_module(mod)
        mod.close()
        ee.close()

    def test_add_module_lifetime2(self):
        ee = self.jit(self.module())
        mod = self.module(asm_mul)
        ee.add_module(mod)
        ee.close()
        mod.close()

    def test_remove_module(self):
        ee = self.jit(self.module())
        mod = self.module(asm_mul)
        ee.add_module(mod)
        ee.remove_module(mod)
        with self.assertRaises(KeyError):
            ee.remove_module(mod)
        self.assertFalse(mod.closed)
        ee.close()
        self.assertFalse(mod.closed)

    def test_target_data(self):
        mod = self.module()
        ee = self.jit(mod)
        td = ee.target_data
        # A singleton is returned
        self.assertIs(ee.target_data, td)
        str(td)
        del mod, ee
        str(td)

    def test_target_data_abi_enquiries(self):
        mod = self.module()
        ee = self.jit(mod)
        td = ee.target_data
        gv_i32 = mod.get_global_variable("glob")
        gv_i8 = mod.get_global_variable("glob_b")
        gv_struct = mod.get_global_variable("glob_struct")
        # A global is a pointer, it has the ABI size of a pointer
        pointer_size = 4 if sys.maxsize < 2 ** 32 else 8
        for g in (gv_i32, gv_i8, gv_struct):
            self.assertEqual(td.get_abi_size(g.type), pointer_size)

        self.assertEqual(td.get_pointee_abi_size(gv_i32.type), 4)
        self.assertEqual(td.get_pointee_abi_alignment(gv_i32.type), 4)

        self.assertEqual(td.get_pointee_abi_size(gv_i8.type), 1)
        self.assertIn(td.get_pointee_abi_alignment(gv_i8.type), (1, 2, 4))

        self.assertEqual(td.get_pointee_abi_size(gv_struct.type), 24)
        self.assertIn(td.get_pointee_abi_alignment(gv_struct.type), (4, 8))

    def test_object_cache_notify(self):
        notifies = []

        def notify(mod, buf):
            notifies.append((mod, buf))

        mod = self.module()
        ee = self.jit(mod)
        ee.set_object_cache(notify)

        self.assertEqual(len(notifies), 0)
        cfunc = self.get_sum(ee)
        cfunc(2, -5)
        self.assertEqual(len(notifies), 1)
        # The right module object was found
        self.assertIs(notifies[0][0], mod)
        self.assertIsInstance(notifies[0][1], bytes)

        notifies[:] = []
        mod2 = self.module(asm_mul)
        ee.add_module(mod2)
        cfunc = self.get_sum(ee, "mul")
        self.assertEqual(len(notifies), 1)
        # The right module object was found
        self.assertIs(notifies[0][0], mod2)
        self.assertIsInstance(notifies[0][1], bytes)

    def test_object_cache_getbuffer(self):
        notifies = []
        getbuffers = []

        def notify(mod, buf):
            notifies.append((mod, buf))

        def getbuffer(mod):
            getbuffers.append(mod)

        mod = self.module()
        ee = self.jit(mod)
        ee.set_object_cache(notify, getbuffer)

        # First return None from getbuffer(): the object is compiled normally
        self.assertEqual(len(notifies), 0)
        self.assertEqual(len(getbuffers), 0)
        cfunc = self.get_sum(ee)
        self.assertEqual(len(notifies), 1)
        self.assertEqual(len(getbuffers), 1)
        self.assertIs(getbuffers[0], mod)
        sum_buffer = notifies[0][1]

        # Recreate a new EE, and use getbuffer() to return the previously
        # compiled object.

        def getbuffer_successful(mod):
            getbuffers.append(mod)
            return sum_buffer

        notifies[:] = []
        getbuffers[:] = []
        # Use another source module to make sure it is ignored
        mod = self.module(asm_mul)
        ee = self.jit(mod)
        ee.set_object_cache(notify, getbuffer_successful)

        self.assertEqual(len(notifies), 0)
        self.assertEqual(len(getbuffers), 0)
        cfunc = self.get_sum(ee)
        self.assertEqual(cfunc(2, -5), -3)
        self.assertEqual(len(notifies), 0)
        self.assertEqual(len(getbuffers), 1)


class JITWithTMTestMixin(JITTestMixin):

    def test_emit_assembly(self):
        """Test TargetMachineRef.emit_assembly()"""
        target_machine = self.target_machine()
        mod = self.module()
        ee = self.jit(mod, target_machine)
        raw_asm = target_machine.emit_assembly(mod)
        self.assertIn("sum", raw_asm)

    def test_emit_object(self):
        """Test TargetMachineRef.emit_object()"""
        target_machine = self.target_machine()
        mod = self.module()
        ee = self.jit(mod, target_machine)
        code_object = target_machine.emit_object(mod)
        self.assertIsInstance(code_object, six.binary_type)
        if sys.platform.startswith('linux'):
            # Sanity check
            self.assertIn(b"ELF", code_object[:10])


class TestMCJit(BaseTest, JITWithTMTestMixin):
    """
    Test JIT engines created with create_mcjit_compiler().
    """

    def jit(self, mod, target_machine=None):
        if target_machine is None:
            target_machine = self.target_machine()
        return llvm.create_mcjit_compiler(mod, target_machine)


class TestValueRef(BaseTest):

    def test_str(self):
        mod = self.module()
        glob = mod.get_global_variable("glob")
        self.assertEqual(str(glob), "@glob = global i32 0")

    def test_name(self):
        mod = self.module()
        glob = mod.get_global_variable("glob")
        self.assertEqual(glob.name, "glob")
        glob.name = "foobar"
        self.assertEqual(glob.name, "foobar")

    def test_linkage(self):
        mod = self.module()
        glob = mod.get_global_variable("glob")
        linkage = glob.linkage
        self.assertIsInstance(glob.linkage, llvm.Linkage)
        glob.linkage = linkage
        self.assertEqual(glob.linkage, linkage)
        for linkage in ("internal", "external"):
            glob.linkage = linkage
            self.assertIsInstance(glob.linkage, llvm.Linkage)
            self.assertEqual(glob.linkage.name, linkage)

    def test_visibility(self):
        mod = self.module()
        glob = mod.get_global_variable("glob")
        visibility = glob.visibility
        self.assertIsInstance(glob.visibility, llvm.Visibility)
        glob.visibility = visibility
        self.assertEqual(glob.visibility, visibility)
        for visibility in ("hidden", "protected", "default"):
            glob.visibility = visibility
            self.assertIsInstance(glob.visibility, llvm.Visibility)
            self.assertEqual(glob.visibility.name, visibility)

    def test_storage_class(self):
        mod = self.module()
        glob = mod.get_global_variable("glob")
        storage_class = glob.storage_class
        self.assertIsInstance(glob.storage_class, llvm.StorageClass)
        glob.storage_class = storage_class
        self.assertEqual(glob.storage_class, storage_class)
        for storage_class in ("dllimport", "dllexport", "default"):
            glob.storage_class = storage_class
            self.assertIsInstance(glob.storage_class, llvm.StorageClass)
            self.assertEqual(glob.storage_class.name, storage_class)

    def test_add_function_attribute(self):
        mod = self.module()
        fn = mod.get_function("sum")
        fn.add_function_attribute("zext")

    def test_module(self):
        mod = self.module()
        glob = mod.get_global_variable("glob")
        self.assertIs(glob.module, mod)

    def test_type(self):
        mod = self.module()
        glob = mod.get_global_variable("glob")
        tp = glob.type
        self.assertIsInstance(tp, ffi.LLVMTypeRef)

    def test_close(self):
        glob = self.glob()
        glob.close()
        glob.close()

    def test_is_declaration(self):
        defined = self.module().get_function('sum')
        declared = self.module(asm_sum_declare).get_function('sum')
        self.assertFalse(defined.is_declaration)
        self.assertTrue(declared.is_declaration)


class TestTarget(BaseTest):

    def test_from_triple(self):
        f = llvm.Target.from_triple
        with self.assertRaises(RuntimeError) as cm:
            f("foobar")
        self.assertIn("No available targets are compatible with this triple",
                      str(cm.exception))
        triple = llvm.get_default_triple()
        target = f(triple)
        self.assertEqual(target.triple, triple)
        target.close()

    def test_create_target_machine(self):
        target = llvm.Target.from_triple(llvm.get_default_triple())
        # With the default settings
        target.create_target_machine('', '', 1, 'default', 'default')
        # With the host's CPU
        cpu = llvm.get_host_cpu_name()
        target.create_target_machine(cpu, '', 1, 'default', 'default')

    def test_name(self):
        t = llvm.Target.from_triple(llvm.get_default_triple())
        u = llvm.Target.from_default_triple()
        self.assertIsInstance(t.name, str)
        self.assertEqual(t.name, u.name)

    def test_description(self):
        t = llvm.Target.from_triple(llvm.get_default_triple())
        u = llvm.Target.from_default_triple()
        self.assertIsInstance(t.description, str)
        self.assertEqual(t.description, u.description)

    def test_str(self):
        target = llvm.Target.from_triple(llvm.get_default_triple())
        s = str(target)
        self.assertIn(target.name, s)
        self.assertIn(target.description, s)


class TestTargetData(BaseTest):

    def target_data(self):
        return llvm.create_target_data("e-m:e-i64:64-f80:128-n8:16:32:64-S128")

    def test_get_abi_size(self):
        td = self.target_data()
        glob = self.glob()
        self.assertEqual(td.get_abi_size(glob.type), 8)

    def test_add_pass(self):
        td = self.target_data()
        pm = llvm.create_module_pass_manager()
        td.add_pass(pm)


class TestTargetMachine(BaseTest):

    def test_add_target_data_pass(self):
        tm = self.target_machine()
        pm = llvm.create_module_pass_manager()
        tm.target_data.add_pass(pm)

    def test_add_analysis_passes(self):
        tm = self.target_machine()
        pm = llvm.create_module_pass_manager()
        tm.add_analysis_passes(pm)

    def test_target_data_from_tm(self):
        tm = self.target_machine()
        td = tm.target_data
        mod = self.module()
        gv_i32 = mod.get_global_variable("glob")
        # A global is a pointer, it has the ABI size of a pointer
        pointer_size = 4 if sys.maxsize < 2 ** 32 else 8
        self.assertEqual(td.get_abi_size(gv_i32.type), pointer_size)


class TestPassManagerBuilder(BaseTest):

    def pmb(self):
        return llvm.PassManagerBuilder()

    def test_old_api(self):
        # Test the create_pass_manager_builder() factory function
        pmb = llvm.create_pass_manager_builder()
        pmb.inlining_threshold = 2
        pmb.opt_level = 3

    def test_close(self):
        pmb = self.pmb()
        pmb.close()
        pmb.close()

    def test_opt_level(self):
        pmb = self.pmb()
        self.assertIsInstance(pmb.opt_level, six.integer_types)
        for i in range(4):
            pmb.opt_level = i
            self.assertEqual(pmb.opt_level, i)

    def test_size_level(self):
        pmb = self.pmb()
        self.assertIsInstance(pmb.size_level, six.integer_types)
        for i in range(4):
            pmb.size_level = i
            self.assertEqual(pmb.size_level, i)

    def test_inlining_threshold(self):
        pmb = self.pmb()
        with self.assertRaises(NotImplementedError):
            pmb.inlining_threshold
        for i in (25, 80, 350):
            pmb.inlining_threshold = i

    def test_disable_unit_at_a_time(self):
        pmb = self.pmb()
        self.assertIsInstance(pmb.disable_unit_at_a_time, bool)
        for b in (True, False):
            pmb.disable_unit_at_a_time = b
            self.assertEqual(pmb.disable_unit_at_a_time, b)

    def test_disable_unroll_loops(self):
        pmb = self.pmb()
        self.assertIsInstance(pmb.disable_unroll_loops, bool)
        for b in (True, False):
            pmb.disable_unroll_loops = b
            self.assertEqual(pmb.disable_unroll_loops, b)

    def test_populate_module_pass_manager(self):
        pmb = self.pmb()
        pm = llvm.create_module_pass_manager()
        pmb.populate(pm)
        pmb.close()
        pm.close()

    def test_populate_function_pass_manager(self):
        mod = self.module()
        pmb = self.pmb()
        pm = llvm.create_function_pass_manager(mod)
        pmb.populate(pm)
        pmb.close()
        pm.close()


class PassManagerTestMixin(object):

    def pmb(self):
        pmb = llvm.create_pass_manager_builder()
        pmb.opt_level = 2
        return pmb

    def test_close(self):
        pm = self.pm()
        pm.close()
        pm.close()


class TestModulePassManager(BaseTest, PassManagerTestMixin):

    def pm(self):
        return llvm.create_module_pass_manager()

    def test_run(self):
        pm = self.pm()
        self.pmb().populate(pm)
        mod = self.module()
        orig_asm = str(mod)
        pm.run(mod)
        opt_asm = str(mod)
        # Quick check that optimizations were run
        self.assertIn("%.3", orig_asm)
        self.assertNotIn("%.3", opt_asm)


class TestFunctionPassManager(BaseTest, PassManagerTestMixin):

    def pm(self, mod=None):
        mod = mod or self.module()
        return llvm.create_function_pass_manager(mod)

    def test_initfini(self):
        pm = self.pm()
        pm.initialize()
        pm.finalize()

    def test_run(self):
        mod = self.module()
        fn = mod.get_function("sum")
        pm = self.pm(mod)
        self.pmb().populate(pm)
        mod.close()
        orig_asm = str(fn)
        pm.initialize()
        pm.run(fn)
        pm.finalize()
        opt_asm = str(fn)
        # Quick check that optimizations were run
        self.assertIn("%.4", orig_asm)
        self.assertNotIn("%.4", opt_asm)


class TestPasses(BaseTest, PassManagerTestMixin):

    def pm(self):
        return llvm.create_module_pass_manager()

    def test_populate(self):
        pm = self.pm()
        pm.add_constant_merge_pass()
        pm.add_dead_arg_elimination_pass()
        pm.add_function_attrs_pass()
        pm.add_function_inlining_pass(225)
        pm.add_global_dce_pass()
        pm.add_global_optimizer_pass()
        pm.add_ipsccp_pass()
        pm.add_dead_code_elimination_pass()
        pm.add_cfg_simplification_pass()
        pm.add_gvn_pass()
        pm.add_instruction_combining_pass()
        pm.add_licm_pass()
        pm.add_sccp_pass()
        pm.add_sroa_pass()
        pm.add_type_based_alias_analysis_pass()
        pm.add_basic_alias_analysis_pass()


class TestDylib(BaseTest):

    def test_bad_library(self):
        with self.assertRaises(RuntimeError):
            llvm.load_library_permanently("zzzasdkf;jasd;l")

    @unittest.skipUnless(platform.system() in ["Linux", "Darwin"],
                         "test only works on Linux and Darwin")
    def test_libm(self):
        system = platform.system()
        if system == "Linux":
            libm = find_library("m")
        elif system == "Darwin":
            libm = find_library("libm")
        llvm.load_library_permanently(libm)


class TestGlobalVariables(BaseTest):
    def check_global_variable_linkage(self, linkage, has_undef=True):
        # This test default initializer on global variables with different
        # linkages.  Some linkages requires an initializer be present, while
        # it is optional for others.  This test uses ``parse_assembly()``
        # to verify that we are adding an `undef` automatically if user didn't
        # specific one for certain linkages.  It is a IR syntax error if the
        # initializer is not present for certain linkages e.g. "external".
        mod = ir.Module()
        typ = ir.IntType(32)
        gv = ir.GlobalVariable(mod, typ, "foo")
        gv.linkage = linkage
        asm = str(mod)
        # check if 'undef' is present
        if has_undef:
            self.assertIn('undef', asm)
        else:
            self.assertNotIn('undef', asm)
        # parse assembly to ensure correctness
        self.module(asm)

    def test_internal_linkage(self):
        self.check_global_variable_linkage('internal')

    def test_common_linkage(self):
        self.check_global_variable_linkage('common')

    def test_external_linkage(self):
        self.check_global_variable_linkage('external', has_undef=False)

    def test_available_externally_linkage(self):
        self.check_global_variable_linkage('available_externally')

    def test_private_linkage(self):
        self.check_global_variable_linkage('private')

    def test_linkonce_linkage(self):
        self.check_global_variable_linkage('linkonce')

    def test_weak_linkage(self):
        self.check_global_variable_linkage('weak')

    def test_appending_linkage(self):
        self.check_global_variable_linkage('appending')

    def test_extern_weak_linkage(self):
        self.check_global_variable_linkage('extern_weak', has_undef=False)

    def test_linkonce_odr_linkage(self):
        self.check_global_variable_linkage('linkonce_odr')

    def test_weak_odr_linkage(self):
        self.check_global_variable_linkage('weak_odr')


if __name__ == "__main__":
    unittest.main()