tests/internal_bench/var: Benchmark checked attribute access.

This commit also includes a fix to the `var-6.2-instance-speciallookup.py`
test originally added by 82db5c8 / micropython#16806, as the `__getattr__` method
actually does not trigger a class's special lookups flag as originally
believed.

Signed-off-by: Anson Mansfield <amansfield@mantaro.com>

Author: AJMansfield

tests/internal_bench/var-6.2-instance-speciallookup.py

@@ -5,7 +5,7 @@ class Foo:
     def __init__(self):
         self.num = 20000000
 
-    def __getattr__(self, name):  # just trigger the 'special lookups' flag on the class
+    def __delattr__(self, name):  # just trigger the 'special lookups' flag on the class
         pass
 
 

tests/internal_bench/var-9-getattr.py

@@ -0,0 +1,16 @@
+import bench
+
+
+class Foo:
+    pass
+
+
+def test(num):
+    o = Foo()
+    o.num = num
+    i = 0
+    while i < getattr(o, "num", num):
+        i += 1
+
+
+bench.run(test)

tests/internal_bench/var-9.1-getattr_default.py

@@ -0,0 +1,15 @@
+import bench
+
+
+class Foo:
+    pass
+
+
+def test(num):
+    o = Foo()
+    i = 0
+    while i < getattr(o, "num", num):
+        i += 1
+
+
+bench.run(test)

tests/internal_bench/var-9.2-getattr_default_special.py

@@ -0,0 +1,16 @@
+import bench
+
+
+class Foo:
+    def __delattr__(self, name):  # just trigger the 'special lookups' flag on the class
+        pass
+
+
+def test(num):
+    o = Foo()
+    i = 0
+    while i < getattr(o, "num", num):
+        i += 1
+
+
+bench.run(test)

tests/internal_bench/var-9.3-except_ok.py

@@ -0,0 +1,23 @@
+import bench
+
+
+class Foo:
+    pass
+
+
+def test(num):
+    o = Foo()
+    o.num = num
+
+    def get():
+        try:
+            return o.num
+        except AttributeError:
+            return num
+
+    i = 0
+    while i < get():
+        i += 1
+
+
+bench.run(test)

tests/internal_bench/var-9.4-except_selfinduced.py

@@ -0,0 +1,22 @@
+import bench
+
+
+class Foo:
+    pass
+
+
+def test(num):
+    o = Foo()
+
+    def get():
+        try:
+            raise AttributeError
+        except AttributeError:
+            return num
+
+    i = 0
+    while i < get():
+        i += 1
+
+
+bench.run(test)

tests/internal_bench/var-9.5-except_error.py

@@ -0,0 +1,22 @@
+import bench
+
+
+class Foo:
+    pass
+
+
+def test(num):
+    o = Foo()
+
+    def get():
+        try:
+            return o.num
+        except AttributeError:
+            return num
+
+    i = 0
+    while i < get():
+        i += 1
+
+
+bench.run(test)

tests/internal_bench/var-9.6-except_error_special.py

@@ -0,0 +1,23 @@
+import bench
+
+
+class Foo:
+    def __delattr__(self, name):  # just trigger the 'special lookups' flag on the class
+        pass
+
+
+def test(num):
+    o = Foo()
+
+    def get():
+        try:
+            return o.num
+        except AttributeError:
+            return num
+
+    i = 0
+    while i < get():
+        i += 1
+
+
+bench.run(test)