Captured arguments object materialization

test/mjsunit/compiler/escape-analysis-arguments.js

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --allow-natives-syntax --use-escape-analysis --expose-gc
+
+
+// Simple test of capture
+(function testCapturedArguments() {
+  function h() {
+    return g.arguments[0];
+  }
+
+  function g(x) {
+    return h();
+  }
+
+  function f() {
+    var l = { y : { z : 4 }, x : 2 }
+    var r = g(l);
+    assertEquals(2, r.x);
+    assertEquals(2, l.x);
+    l.x = 3;
+    l.y.z = 5;
+    // Test that the arguments object is properly
+    // aliased
+    assertEquals(3, r.x);
+    assertEquals(3, l.x);
+    assertEquals(5, r.y.z);
+  }
+
+  f(); f(); f();
+  %OptimizeFunctionOnNextCall(f);
+  f();
+})();
+
+
+// Get the arguments object twice, test aliasing
+(function testTwoCapturedArguments() {
+  function h() {
+    return g.arguments[0];
+  }
+
+  function i() {
+    return g.arguments[0];
+  }
+
+  function g(x) {
+    return {h : h() , i : i()};
+  }
+
+  function f() {
+    var l = { y : { z : 4 }, x : 2 }
+    var r = g(l);
+    assertEquals(2, r.h.x)
+    l.y.z = 3;
+    assertEquals(3, r.h.y.z);
+    assertEquals(3, r.i.y.z);
+  }
+
+  f(); f(); f();
+  %OptimizeFunctionOnNextCall(f);
+  f();
+})();
+
+
+// Nested arguments object test
+(function testTwoCapturedArgumentsNested() {
+  function i() {
+    return { gx : g.arguments[0], hx : h.arguments[0] };
+  }
+
+  function h(x) {
+    return i();
+  }
+
+  function g(x) {
+    return h(x.y);
+  }
+
+  function f() {
+    var l = { y : { z : 4 }, x : 2 }
+    var r = g(l);
+    assertEquals(2, r.gx.x)
+    assertEquals(4, r.gx.y.z)
+    assertEquals(4, r.hx.z)
+    l.y.z = 3;
+    assertEquals(3, r.gx.y.z)
+    assertEquals(3, r.hx.z)
+    assertEquals(3, l.y.z)
+  }
+
+  f(); f(); f();
+  %OptimizeFunctionOnNextCall(f);
+  f(); f();
+  %OptimizeFunctionOnNextCall(f);
+  f(); f();
+})();
+
+
+// Nested arguments object test with different inlining
+(function testTwoCapturedArgumentsNested2() {
+  function i() {
+    return { gx : g.arguments[0], hx : h.arguments[0] };
+  }
+
+  function h(x) {
+    return i();
+  }
+
+  function g(x) {
+    return h(x.y);
+  }
+
+  function f() {
+    var l = { y : { z : 4 }, x : 2 }
+    var r = g(l);
+    assertEquals(2, r.gx.x)
+    assertEquals(4, r.gx.y.z)
+    assertEquals(4, r.hx.z)
+    l.y.z = 3;
+    assertEquals(3, r.gx.y.z)
+    assertEquals(3, r.hx.z)
+    assertEquals(3, l.y.z)
+  }
+
+  %NeverOptimizeFunction(i);
+  f(); f(); f();
+  %OptimizeFunctionOnNextCall(f);
+  f(); f();
+  %OptimizeFunctionOnNextCall(f);
+  f(); f();
+})();
+
+
+// Multiple captured argument test
+(function testTwoArgumentsCapture() {
+  function h() {
+    return { a : g.arguments[1], b : g.arguments[0] };
+  }
+
+  function g(x, y) {
+    return h();
+  }
+
+  function f() {
+    var l = { y : { z : 4 }, x : 2 }
+    var k = { t : { u : 3 } };
+    var r = g(k, l);
+    assertEquals(2, r.a.x)
+    assertEquals(4, r.a.y.z)
+    assertEquals(3, r.b.t.u)
+    l.y.z = 6;
+    r.b.t.u = 7;
+    assertEquals(6, r.a.y.z)
+    assertEquals(7, k.t.u)
+  }
+
+  f(); f(); f();
+  %OptimizeFunctionOnNextCall(f);
+  f(); f();
+  %OptimizeFunctionOnNextCall(f);
+  f(); f();
+})();