Implement function destructuring argument support. (#3322)

Furthermore create unmapped arguments objects if a function has a non-simple argument.
A few destructuring pattern issues were fixed as well.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tests/jerry/es2015/function-param-init2.js

@@ -61,6 +61,8 @@ var arguments = 10;
 function j(a = arguments[1])
 {
   assert(a === 2);
+  a = 3;
+  assert(arguments[0] === undefined)
 }
 j(undefined,2);
 
@@ -72,10 +74,27 @@ function k(a = 2)
 }
 k();
 
-function i(a = 3)
+function l(a = 3)
 {
   const d = 6;
   assert(d === 6);
   eval("assert(a === 3)");
 }
-i();
+l();
+
+function m(a, b = 2)
+{
+  assert(a === 1);
+  assert(arguments[0] === 1);
+  assert(b === 2);
+  assert(arguments[1] === undefined);
+
+  a = 8;
+  b = 9;
+
+  assert(a === 8);
+  assert(arguments[0] === 1);
+  assert(b === 9);
+  assert(arguments[1] === undefined);
+}
+m(1);

tests/jerry/es2015/function-pattern1.js

@@ -0,0 +1,93 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+function must_throw (str, type = SyntaxError)
+{
+  try
+  {
+    eval (str);
+    assert (false);
+  }
+  catch (e)
+  {
+    assert (e instanceof type)
+  }
+}
+
+must_throw ("function f(a, [a]) {}");
+must_throw ("function f([a], a) {}");
+must_throw ("function f(a = b, [b]) {}; f()", ReferenceError);
+must_throw ("function f([a+b]) {}");
+must_throw ("function f([a().b]) {}");
+
+function a1([a,b]) {
+  var a, b;
+
+  assert(a === 1);
+  assert(b === undefined);
+
+  var a = 3;
+  assert(a === 3);
+}
+a1([1]);
+
+function a2([a,b]) {
+  eval("var a, b");
+  assert(a === 1);
+  assert(b === undefined);
+
+  eval("var a = 3");
+  assert(a === 3);
+}
+a2([1]);
+
+function f1(a, [b], c, [d], e)
+{
+  assert (a === 1);
+  assert (b === 2);
+  assert (c === 3);
+  assert (d === 4);
+  assert (e === 5);
+}
+f1(1, [2], 3, [4], 5)
+
+function f2(a, [b], c, [d], e)
+{
+  eval("");
+  assert (a === 1);
+  assert (b === 2);
+  assert (c === 3);
+  assert (d === 4);
+  assert (e === 5);
+}
+f2(1, [2], 3, [4], 5)
+
+var g1 = (a, [b], c, [d], e) => {
+  assert (a === 1);
+  assert (b === 2);
+  assert (c === 3);
+  assert (d === 4);
+  assert (e === 5);
+}
+g1(1, [2], 3, [4], 5)
+
+var g2 = (a, [b], c, [d], e) => {
+  eval("");
+  assert (a === 1);
+  assert (b === 2);
+  assert (c === 3);
+  assert (d === 4);
+  assert (e === 5);
+}
+g2(1, [2], 3, [4], 5)

tests/jerry/es2015/function-pattern2.js

@@ -0,0 +1,61 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+assert((function([a], b, {c}) {}).length === 3);
+
+function f([a = "x", b = "y", c = "z"])
+{
+  assert(a === "a");
+  assert(b === "b");
+  assert(c === "z");
+}
+f("ab")
+
+function g({ ["x" + "y"]: { a = 4, b = 5 }, })
+{
+  assert(a === 1);
+  assert(b === 5);
+}
+g({ xy: { a:1 } });
+
+function h([,,a,,b,,])
+{
+  assert(a === 3);
+  assert(b === 5);
+}
+h([1,2,3,4,5,6,7,8])
+
+function i([a] = [42], b = a)
+{
+  assert(a === 42);
+  assert(b === 42);
+}
+i();
+
+function j(a, [[b = a, [c] = [b], { d } = { d:eval("c") }], e = d + 1] = [[]])
+{
+  assert(a === 8);
+  assert(b === 8);
+  assert(c === 8);
+  assert(d === 8);
+  assert(e === 9);
+}
+j(8);
+
+function k([a = function() { return a; }])
+{
+  assert(typeof a === "function");
+  assert(a() === a);
+}
+k([]);

tests/jerry/es2015/function-rest-parameter.js

@@ -78,3 +78,18 @@ assert (g2 () === 11);
 assert (g2 (1) === 3);
 assert (g2 (1, 2) === 3);
 assert (g2 (1, 2, 3) === 4);
+
+function args(a, ...b)
+{
+  assert(a === 1);
+  assert(arguments[0] === 1);
+
+  a = 5;
+
+  assert(a === 5);
+  assert(arguments[0] === 1);
+
+  assert(arguments[1] === 2);
+  assert(b[0] === 2)
+}
+args(1, 2);

tests/unit-core/test-snapshot.c

@@ -223,15 +223,15 @@ main (void)
     /* Check the snapshot data. Unused bytes should be filled with zeroes */
     const uint8_t expected_data[] =
     {
-      0x4A, 0x52, 0x52, 0x59, 0x1D, 0x00, 0x00, 0x00,
+      0x4A, 0x52, 0x52, 0x59, 0x1E, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x00, 0x00, 0x48, 0x00, 0x00, 0x00,
       0x01, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
-      0x03, 0x00, 0x01, 0x00, 0x21, 0x00, 0x01, 0x00,
+      0x03, 0x00, 0x01, 0x00, 0x41, 0x00, 0x01, 0x00,
       0x00, 0x00, 0x00, 0x01, 0x18, 0x00, 0x00, 0x00,
-      0x2C, 0x00, 0xBF, 0x4D, 0x00, 0x00, 0x00, 0x00,
-      0x03, 0x00, 0x01, 0x00, 0x21, 0x00, 0x00, 0x00,
+      0x2C, 0x00, 0xC0, 0x4E, 0x00, 0x00, 0x00, 0x00,
+      0x03, 0x00, 0x01, 0x00, 0x41, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x01, 0x01, 0x07, 0x00, 0x00, 0x00,
-      0x4E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+      0x4F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x14, 0x00, 0x73, 0x74, 0x72, 0x69, 0x6E, 0x67,
       0x20, 0x66, 0x72, 0x6F, 0x6D, 0x20, 0x73, 0x6E,
       0x61, 0x70, 0x73, 0x68, 0x6F, 0x74,