diff options
Diffstat (limited to 'test')
| -rwxr-xr-x | test/t/lang.rb | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/test/t/lang.rb b/test/t/lang.rb new file mode 100755 index 000000000..23b92771a --- /dev/null +++ b/test/t/lang.rb @@ -0,0 +1,73 @@ +# The aim of these tests is to detect pitfall for optimized VM.
+
+# Test for or/and
+#
+# You may think instruction fusion(OP_EQ and OP_JMPIF) for avoiding
+# generate intermedicate boolean value.
+# But and/or is pitfall for this fusioning.
+#
+# For example. Folloging mruby code
+# if i > 0 and i < 10 then
+#
+# compilies to RITE bitecode
+#
+# 1 000 OP_LOADI R1 0 ; R1:i
+# 2 001 OP_MOVE R2 R1 ; R1:i
+# 2 002 OP_LOADI R3 0
+# 2 003 OP_GT R2 :> 1
+# 2 004 OP_JMPNOT R2 008
+# 2 005 OP_MOVE R2 R1 ; R1:i
+# 2 006 OP_LOADI R3 10
+# 2 007 OP_LT R2 :< 1
+# 2 008 OP_JMPNOT R2 (The address of end of then part)
+#
+# When the instruction fusion the OP_GT and OP_JMPNOT you fell into the pitfalls.
+# The deleted intermedicate boolean value is used in OP_JMPNOT (address 008).
+
+assert('and', '11.2.3') do
+ a = 1
+ if a > 0 and a < 10 then
+ b = 1
+ else
+ b = 0
+ end
+ assert_equal 1, b
+
+ if a < 0 and a < 10 then
+ b = 1
+ else
+ b = 0
+ end
+ assert_equal 0, b
+
+ if a < 0 and a > 10 then
+ b = 1
+ else
+ b = 0
+ end
+ assert_equal 0, b
+end
+
+assert('or','11.2.4') do
+ a = 1
+ if a > 0 or a < 10 then
+ b = 1
+ else
+ b = 0
+ end
+ assert_equal 1, b
+
+ if a < 0 or a < 10 then
+ b = 1
+ else
+ b = 0
+ end
+ assert_equal 1, b
+
+ if a < 0 or a > 10 then
+ b = 1
+ else
+ b = 0
+ end
+ assert_equal 0, b
+end
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