First implementation of allocation elimination in Hydrogen.

test/mjsunit/compiler/escape-analysis.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
+
+
+// Test stores on a join path.
+(function testJoin() {
+  function constructor() {
+    this.a = 0;
+  }
+  function join(mode, expected) {
+    var object = new constructor();
+    if (mode) {
+      object.a = 1;
+    } else {
+      object.a = 2;
+    }
+    assertEquals(expected, object.a);
+  }
+  join(true, 1); join(true, 1);
+  join(false, 2); join(false, 2);
+  %OptimizeFunctionOnNextCall(join);
+  join(true, 1); join(false, 2);
+})();
+
+
+// Test loads and stores inside a loop.
+(function testLoop() {
+  function constructor() {
+    this.a = 0;
+    this.b = 23;
+  }
+  function loop() {
+    var object = new constructor();
+    for (var i = 1; i < 10; i++) {
+      object.a = object.a + i;
+      assertEquals(i*(i+1)/2, object.a);
+      assertEquals(23, object.b);
+    }
+    assertEquals(45, object.a);
+    assertEquals(23, object.b);
+  }
+  loop(); loop();
+  %OptimizeFunctionOnNextCall(loop);
+  loop(); loop();
+})();
+
+
+// Test loads and stores inside nested loop.
+(function testNested() {
+  function constructor() {
+    this.a = 0;
+    this.b = 0;
+    this.c = 23;
+  }
+  function nested() {
+    var object = new constructor();
+    for (var i = 1; i < 10; i++) {
+      object.a = object.a + i;
+      assertEquals(i*(i+1)/2, object.a);
+      assertEquals((i-1)*6, object.b);
+      assertEquals(23, object.c);
+      for (var j = 1; j < 4; j++) {
+        object.b = object.b + j;
+        assertEquals(i*(i+1)/2, object.a);
+        assertEquals((i-1)*6+j*(j+1)/2, object.b);
+        assertEquals(23, object.c);
+      }
+      assertEquals(i*(i+1)/2, object.a);
+      assertEquals(i*6, object.b);
+      assertEquals(23, object.c);
+    }
+    assertEquals(45, object.a);
+    assertEquals(54, object.b);
+    assertEquals(23, object.c);
+  }
+  nested(); nested();
+  %OptimizeFunctionOnNextCall(nested);
+  nested(); nested();
+})();
+
+
+// Test deoptimization with captured objects in local variables.
+(function testDeoptLocal() {
+  var deopt = { deopt:false };
+  function constructor1() {
+    this.a = 1.0;
+    this.b = 2.3;
+    this.c = 3.0;
+  }
+  function constructor2(o) {
+    this.d = o;
+    this.e = 4.5;
+  }
+  function func() {
+    var o1 = new constructor1();
+    var o2 = new constructor2(o1);
+    deopt.deopt;
+    assertEquals(1.0, o1.a);
+    assertEquals(2.3, o2.d.b);
+    assertEquals(3.0, o2.d.c);
+    assertEquals(4.5, o2.e);
+  }
+  func(); func();
+  %OptimizeFunctionOnNextCall(func);
+  func(); func();
+  delete deopt.deopt;
+  func(); func();
+})();