[test] Test elem offsets with extended const exprs (#18)

Author: takikawa

test/core/elem.wast

@@ -699,3 +699,60 @@
 )
 
 (assert_return (invoke "call_imported_elem") (i32.const 42))
+
+;; Extended contant expressions
+
+(module
+  (table 10 funcref)
+  (func (result i32) (i32.const 42))
+  (func (export "call_in_table") (param i32) (result i32)
+    (call_indirect (type 0) (local.get 0)))
+  (elem (table 0) (offset (i32.add (i32.const 1) (i32.const 2))) funcref (ref.func 0))
+)
+
+(assert_return (invoke "call_in_table" (i32.const 3)) (i32.const 42))
+(assert_trap (invoke "call_in_table" (i32.const 0)) "uninitialized element")
+
+(module
+  (table 10 funcref)
+  (func (result i32) (i32.const 42))
+  (func (export "call_in_table") (param i32) (result i32)
+    (call_indirect (type 0) (local.get 0)))
+  (elem (table 0) (offset (i32.sub (i32.const 2) (i32.const 1))) funcref (ref.func 0))
+)
+
+(assert_return (invoke "call_in_table" (i32.const 1)) (i32.const 42))
+(assert_trap (invoke "call_in_table" (i32.const 0)) "uninitialized element")
+
+(module
+  (table 10 funcref)
+  (func (result i32) (i32.const 42))
+  (func (export "call_in_table") (param i32) (result i32)
+    (call_indirect (type 0) (local.get 0)))
+  (elem (table 0) (offset (i32.mul (i32.const 2) (i32.const 2))) funcref (ref.func 0))
+)
+
+(assert_return (invoke "call_in_table" (i32.const 4)) (i32.const 42))
+(assert_trap (invoke "call_in_table" (i32.const 0)) "uninitialized element")
+
+;; Combining add, sub, mul and global.get
+
+(module
+  (global (import "spectest" "global_i32") i32)
+  (table 10 funcref)
+  (func (result i32) (i32.const 42))
+  (func (export "call_in_table") (param i32) (result i32)
+    (call_indirect (type 0) (local.get 0)))
+  (elem (table 0)
+        (offset
+          (i32.mul
+            (i32.const 2)
+            (i32.add
+              (i32.sub (global.get 0) (i32.const 665))
+              (i32.const 2))))
+        funcref
+        (ref.func 0))
+)
+
+(assert_return (invoke "call_in_table" (i32.const 6)) (i32.const 42))
+(assert_trap (invoke "call_in_table" (i32.const 0)) "uninitialized element")