Repository: numba/numba

Issue:
master: @overload_method issues with *args
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## Reporting a bug

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- [ ] I am using the latest released version of Numba (most recent is visible in
 the change log (https://github.com/numba/numba/blob/master/CHANGE_LOG).
- [x] I have included below a minimal working reproducer (if you are unsure how
 to write one see http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports).

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Seems to happens after `@overload_method` refactoring merge
```
class DummyType(types.Opaque):
    pass

dummy_type = DummyType("my_dummy")
register_model(DummyType)(OpaqueModel)

class Dummy(object):
    pass

@typeof_impl.register(Dummy)
def typeof_Dummy(val, c):
    return dummy_type

@unbox(DummyType)
def unbox_index(typ, obj, c):
    return NativeValue(c.context.get_dummy_value())

@overload_method(DummyType, "inline_method")
def _get_inlined_method(obj,val,val2,*args):
    def get(obj, val, val2,*args):
        return ("THIS IS INLINED", val, val2)
    return get

@njit
def bar(obj):
    return obj.inline_method(123,456)

print(bar(Dummy()))
```
```
Traceback (most recent call last):
  File "/home/ibutygin/miniconda3/envs/NUMBA_CUSTOM/lib/python3.7/site-packages/llvmlite/ir/instructions.py", line 619, in __init__
    typ = typ.elements[i]
IndexError: tuple index out of range

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ibutygin/src/numba/numba/numba/errors.py", line 717, in new_error_context
    yield
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 260, in lower_block
    self.lower_inst(inst)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 303, in lower_inst
    val = self.lower_assign(ty, inst)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 467, in lower_assign
    return self.lower_expr(ty, value)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 932, in lower_expr
    res = self.lower_call(resty, expr)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 724, in lower_call
    res = self._lower_call_normal(fnty, expr, signature)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 903, in _lower_call_normal
    res = impl(self.builder, argvals, self.loc)
  File "/home/ibutygin/src/numba/numba/numba/targets/base.py", line 1132, in __call__
    res = self._imp(self._context, builder, self._sig, args, loc=loc)
  File "/home/ibutygin/src/numba/numba/numba/targets/base.py", line 1157, in wrapper
    return fn(*args, **kwargs)
  File "/home/ibutygin/src/numba/numba/numba/typing/templates.py", line 778, in method_impl
    return call(builder, args)
  File "/home/ibutygin/src/numba/numba/numba/targets/base.py", line 1132, in __call__
    res = self._imp(self._context, builder, self._sig, args, loc=loc)
  File "/home/ibutygin/src/numba/numba/numba/targets/base.py", line 1157, in wrapper
    return fn(*args, **kwargs)
  File "/home/ibutygin/src/numba/numba/numba/targets/imputils.py", line 193, in imp
    builder, func, fndesc.restype, fndesc.argtypes, args)
  File "/home/ibutygin/src/numba/numba/numba/targets/callconv.py", line 477, in call_function
    args = list(arginfo.as_arguments(builder, args))
  File "/home/ibutygin/src/numba/numba/numba/datamodel/packer.py", line 100, in as_arguments
    for dm, val in zip(self._dm_args, values)
  File "/home/ibutygin/src/numba/numba/numba/datamodel/packer.py", line 100, in <listcomp>
    for dm, val in zip(self._dm_args, values)
  File "/home/ibutygin/src/numba/numba/numba/datamodel/models.py", line 447, in as_argument
    v = builder.extract_value(value, [i])
  File "/home/ibutygin/miniconda3/envs/NUMBA_CUSTOM/lib/python3.7/site-packages/llvmlite/ir/builder.py", line 927, in extract_value
    instr = instructions.ExtractValue(self.block, agg, idx, name=name)
  File "/home/ibutygin/miniconda3/envs/NUMBA_CUSTOM/lib/python3.7/site-packages/llvmlite/ir/instructions.py", line 622, in __init__
    % (list(indices), agg.type))
TypeError: Can't index at [0] in {}

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test.py", line 73, in <module>
    print(bar(Dummy()))
  File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 420, in _compile_for_args
    raise e
  File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 353, in _compile_for_args
    return self.compile(tuple(argtypes))
  File "/home/ibutygin/src/numba/numba/numba/compiler_lock.py", line 32, in _acquire_compile_lock
    return func(*args, **kwargs)
  File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 768, in compile
    cres = self._compiler.compile(args, return_type)
  File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 77, in compile
    status, retval = self._compile_cached(args, return_type)
  File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 91, in _compile_cached
    retval = self._compile_core(args, return_type)
  File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 109, in _compile_core
    pipeline_class=self.pipeline_class)
  File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 543, in compile_extra
    return pipeline.compile_extra(func)
  File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 328, in compile_extra
    return self._compile_bytecode()
  File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 389, in _compile_bytecode
    return self._compile_core()
  File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 368, in _compile_core
    raise e
  File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 359, in _compile_core
    pm.run(self.state)
  File "/home/ibutygin/src/numba/numba/numba/compiler_machinery.py", line 331, in run
    raise patched_exception
  File "/home/ibutygin/src/numba/numba/numba/compiler_machinery.py", line 322, in run
    self._runPass(idx, pass_inst, state)
  File "/home/ibutygin/src/numba/numba/numba/compiler_lock.py", line 32, in _acquire_compile_lock
    return func(*args, **kwargs)
  File "/home/ibutygin/src/numba/numba/numba/compiler_machinery.py", line 281, in _runPass
    mutated |= check(pss.run_pass, internal_state)
  File "/home/ibutygin/src/numba/numba/numba/compiler_machinery.py", line 268, in check
    mangled = func(compiler_state)
  File "/home/ibutygin/src/numba/numba/numba/typed_passes.py", line 391, in run_pass
    NativeLowering().run_pass(state)
  File "/home/ibutygin/src/numba/numba/numba/typed_passes.py", line 333, in run_pass
    lower.lower()
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 179, in lower
    self.lower_normal_function(self.fndesc)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 220, in lower_normal_function
    entry_block_tail = self.lower_function_body()
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 245, in lower_function_body
    self.lower_block(block)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 260, in lower_block
    self.lower_inst(inst)
  File "/home/ibutygin/miniconda3/envs/NUMBA_CUSTOM/lib/python3.7/contextlib.py", line 130, in __exit__
    self.gen.throw(type, value, traceback)
  File "/home/ibutygin/src/numba/numba/numba/errors.py", line 725, in new_error_context
    six.reraise(type(newerr), newerr, tb)
  File "/home/ibutygin/src/numba/numba/numba/six.py", line 669, in reraise
    raise value
numba.errors.LoweringError: Failed in nopython mode pipeline (step: nopython mode backend)
Can't index at [0] in {}

File "test.py", line 71:
def bar(obj):
    return obj.inline_method(123,456)
    ^

[1] During: lowering "$10call_method.4 = call $4load_method.1($const6.2, $const8.3, func=$4load_method.1, args=[Var($const6.2, test.py:71), Var($const8.3, test.py:71)], kws=(), vararg=None)" at test.py (71)
```
If I write
```
@overload_method(DummyType, "inline_method", strict=False)
def _get_inlined_method(obj,val,val2,*args):
    def get(obj, val, val2):
        return ("THIS IS INLINED", val, val2)
    return get
```
```
Traceback (most recent call last):
  File "/home/ibutygin/src/numba/numba/numba/errors.py", line 717, in new_error_context
    yield
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 260, in lower_block
    self.lower_inst(inst)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 303, in lower_inst
    val = self.lower_assign(ty, inst)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 467, in lower_assign
    return self.lower_expr(ty, value)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 932, in lower_expr
    res = self.lower_call(resty, expr)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 724, in lower_call
    res = self._lower_call_normal(fnty, expr, signature)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 893, in _lower_call_normal
    fnty, signature, expr.args, expr.vararg, expr.kws,
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 667, in fold_call_args
    stararg_handler)
  File "/home/ibutygin/src/numba/numba/numba/typing/templates.py", line 179, in fold_arguments
    ba.arguments.get(name, ()))
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 657, in stararg_handler
    stararg_ty = signature.args[index]
IndexError: tuple index out of range

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test.py", line 73, in <module>
    print(bar(Dummy()))
  File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 420, in _compile_for_args
    raise e
  File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 353, in _compile_for_args
    return self.compile(tuple(argtypes))
  File "/home/ibutygin/src/numba/numba/numba/compiler_lock.py", line 32, in _acquire_compile_lock
    return func(*args, **kwargs)
  File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 768, in compile
    cres = self._compiler.compile(args, return_type)
  File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 77, in compile
    status, retval = self._compile_cached(args, return_type)
  File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 91, in _compile_cached
    retval = self._compile_core(args, return_type)
  File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 109, in _compile_core
    pipeline_class=self.pipeline_class)
  File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 543, in compile_extra
    return pipeline.compile_extra(func)
  File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 328, in compile_extra
    return self._compile_bytecode()
  File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 389, in _compile_bytecode
    return self._compile_core()
  File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 368, in _compile_core
    raise e
  File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 359, in _compile_core
    pm.run(self.state)
  File "/home/ibutygin/src/numba/numba/numba/compiler_machinery.py", line 331, in run
    raise patched_exception
  File "/home/ibutygin/src/numba/numba/numba/compiler_machinery.py", line 322, in run
    self._runPass(idx, pass_inst, state)
  File "/home/ibutygin/src/numba/numba/numba/compiler_lock.py", line 32, in _acquire_compile_lock
    return func(*args, **kwargs)
  File "/home/ibutygin/src/numba/numba/numba/compiler_machinery.py", line 281, in _runPass
    mutated |= check(pss.run_pass, internal_state)
  File "/home/ibutygin/src/numba/numba/numba/compiler_machinery.py", line 268, in check
    mangled = func(compiler_state)
  File "/home/ibutygin/src/numba/numba/numba/typed_passes.py", line 391, in run_pass
    NativeLowering().run_pass(state)
  File "/home/ibutygin/src/numba/numba/numba/typed_passes.py", line 333, in run_pass
    lower.lower()
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 179, in lower
    self.lower_normal_function(self.fndesc)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 220, in lower_normal_function
    entry_block_tail = self.lower_function_body()
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 245, in lower_function_body
    self.lower_block(block)
  File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 260, in lower_block
    self.lower_inst(inst)
  File "/home/ibutygin/miniconda3/envs/NUMBA_CUSTOM/lib/python3.7/contextlib.py", line 130, in __exit__
    self.gen.throw(type, value, traceback)
  File "/home/ibutygin/src/numba/numba/numba/errors.py", line 725, in new_error_context
    six.reraise(type(newerr), newerr, tb)
  File "/home/ibutygin/src/numba/numba/numba/six.py", line 669, in reraise
    raise value
numba.errors.LoweringError: Failed in nopython mode pipeline (step: nopython mode backend)
tuple index out of range

File "test.py", line 71:
def bar(obj):
    return obj.inline_method(123,456)
    ^

[1] During: lowering "$10call_method.4 = call $4load_method.1($const6.2, $const8.3, func=$4load_method.1, args=[Var($const6.2, test.py:71), Var($const8.3, test.py:71)], kws=(), vararg=None)" at test.py (71)
```

Second variant worked fine previously


Discussion:

Resolving patch:
diff --git a/numba/listobject.py b/numba/listobject.py
--- a/numba/listobject.py
+++ b/numba/listobject.py
@@ -254,7 +254,8 @@ def new_list(item, allocated=0):
         number of items to pre-allocate
 
     """
-    raise NotImplementedError
+    # With JIT disabled, ignore all arguments and return a Python list.
+    return list()
 
 
 @intrinsic
diff --git a/numba/typed/typedlist.py b/numba/typed/typedlist.py
--- a/numba/typed/typedlist.py
+++ b/numba/typed/typedlist.py
@@ -13,6 +13,7 @@
 from numba.types import ListType, TypeRef
 from numba.targets.imputils import numba_typeref_ctor
 from numba import listobject
+from numba import config
 from numba import njit, types, cgutils, errors, typeof
 from numba.extending import (
     overload_method,
@@ -149,6 +150,13 @@ class List(MutableSequence):
 
     Implements the MutableSequence interface.
     """
+
+    def __new__(cls, lsttype=None, meminfo=None, allocated=None):
+        if config.DISABLE_JIT:
+            return list.__new__(list)
+        else:
+            return object.__new__(cls)
+
     @classmethod
     def empty_list(cls, item_type, allocated=0):
         """Create a new empty List.
@@ -160,7 +168,10 @@ def empty_list(cls, item_type, allocated=0):
         allocated: int
             number of items to pre-allocate
         """
-        return cls(lsttype=ListType(item_type), allocated=allocated)
+        if config.DISABLE_JIT:
+            return list()
+        else:
+            return cls(lsttype=ListType(item_type), allocated=allocated)
 
     def __init__(self, **kwargs):
         """


Test patch:
diff --git a/numba/tests/test_listobject.py b/numba/tests/test_listobject.py
--- a/numba/tests/test_listobject.py
+++ b/numba/tests/test_listobject.py
@@ -17,7 +17,8 @@
 from numba.errors import TypingError
 from numba import listobject
 from numba.utils import IS_PY3
-from .support import TestCase, MemoryLeakMixin, unittest
+from .support import (TestCase, MemoryLeakMixin, unittest, override_config,
+                      forbid_codegen)
 
 skip_py2 = unittest.skipUnless(IS_PY3, reason='not supported in py2')
 
@@ -36,6 +37,12 @@ def foo(n):
         for i in (0, 1, 2, 100):
             self.assertEqual(foo(i), i)
 
+    def test_list_create_no_jit(self):
+        with override_config('DISABLE_JIT', True):
+            with forbid_codegen():
+                l = listobject.new_list(int32)
+                self.assertEqual(type(l), list)
+
 
 class TestBool(MemoryLeakMixin, TestCase):
     """Test list bool."""
diff --git a/numba/tests/test_typedlist.py b/numba/tests/test_typedlist.py
--- a/numba/tests/test_typedlist.py
+++ b/numba/tests/test_typedlist.py
@@ -9,7 +9,8 @@
 from numba import jitclass, typeof
 from numba.typed import List, Dict
 from numba.utils import IS_PY3
-from .support import TestCase, MemoryLeakMixin, unittest
+from .support import (TestCase, MemoryLeakMixin, unittest, override_config,
+                      forbid_codegen)
 
 from numba.unsafe.refcount import get_refcount
 
@@ -446,6 +447,18 @@ def setup(start=10, stop=20):
             del tl[sa:so:se]
             self.assertEqual(rl, list(tl))
 
+    def test_list_create_no_jit_using_empty_list(self):
+        with override_config('DISABLE_JIT', True):
+            with forbid_codegen():
+                l = List.empty_list(types.int32)
+                self.assertEqual(type(l), list)
+
+    def test_list_create_no_jit_using_List(self):
+        with override_config('DISABLE_JIT', True):
+            with forbid_codegen():
+                l = List()
+                self.assertEqual(type(l), list)
+
 
 class TestAllocation(MemoryLeakMixin, TestCase):