Add initial support for inlining.

test/cctest/compiler/test-run-inlining.cc

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/v8.h"
+
+#include "test/cctest/compiler/function-tester.h"
+
+using namespace v8::internal;
+using namespace v8::internal::compiler;
+
+// TODO(sigurds) At the moment we do not write optimization frames when
+// inlining, thus the reported stack depth changes depending on inlining.
+// AssertStackDepth checks the stack depth at a simple way to ensure that
+// inlining actually occurs.
+// Once inlining creates optimization frames, all these unit tests need to
+// check that the optimization frame is there.
+
+TEST(SimpleInlining) {
+  i::FLAG_turbo_inlining = true;
+  FunctionTester T(
+      "(function(){"
+      "function foo(s) { AssertStackDepth(1); return s; };"
+      "function bar(s, t) { return foo(s); };"
+      "return bar;})();");
+
+  T.CheckCall(T.Val(1), T.Val(1), T.Val(2));
+}
+
+
+TEST(SimpleInliningContext) {
+  i::FLAG_turbo_inlining = true;
+  FunctionTester T(
+      "(function () {"
+      "function foo(s) { AssertStackDepth(1); var x = 12; return s + x; };"
+      "function bar(s, t) { return foo(s); };"
+      "return bar;"
+      "})();");
+
+  T.CheckCall(T.Val(13), T.Val(1), T.Val(2));
+}
+
+
+TEST(CaptureContext) {
+  i::FLAG_turbo_inlining = true;
+  FunctionTester T(
+      "var f = (function () {"
+      "var x = 42;"
+      "function bar(s) { return x + s; };"
+      "return (function (s) { return bar(s); });"
+      "})();"
+      "(function (s) { return f(s)})");
+
+  T.CheckCall(T.Val(42 + 12), T.Val(12), T.undefined());
+}
+
+
+// TODO(sigurds) For now we do not inline any native functions. If we do at
+// some point, change this test.
+TEST(DontInlineEval) {
+  i::FLAG_turbo_inlining = true;
+  FunctionTester T(
+      "var x = 42;"
+      "(function () {"
+      "function bar(s, t) { return eval(\"AssertStackDepth(2); x\") };"
+      "return bar;"
+      "})();");
+
+  T.CheckCall(T.Val(42), T.Val("x"), T.undefined());
+}
+
+
+TEST(InlineOmitArguments) {
+  i::FLAG_turbo_inlining = true;
+  FunctionTester T(
+      "(function () {"
+      "var x = 42;"
+      "function bar(s, t, u, v) { AssertStackDepth(1); return x + s; };"
+      "return (function (s,t) { return bar(s); });"
+      "})();");
+
+  T.CheckCall(T.Val(42 + 12), T.Val(12), T.undefined());
+}
+
+
+TEST(InlineSurplusArguments) {
+  i::FLAG_turbo_inlining = true;
+  FunctionTester T(
+      "(function () {"
+      "var x = 42;"
+      "function foo(s) { AssertStackDepth(1); return x + s; };"
+      "function bar(s,t) { return foo(s,t,13); };"
+      "return bar;"
+      "})();");
+
+  T.CheckCall(T.Val(42 + 12), T.Val(12), T.undefined());
+}
+
+
+TEST(InlineTwice) {
+  i::FLAG_turbo_inlining = true;
+  FunctionTester T(
+      "(function () {"
+      "var x = 42;"
+      "function bar(s) { AssertStackDepth(1); return x + s; };"
+      "return (function (s,t) { return bar(s) + bar(t); });"
+      "})();");
+
+  T.CheckCall(T.Val(2 * 42 + 12 + 4), T.Val(12), T.Val(4));
+}
+
+
+TEST(InlineTwiceDependent) {
+  i::FLAG_turbo_inlining = true;
+  FunctionTester T(
+      "(function () {"
+      "var x = 42;"
+      "function foo(s) { AssertStackDepth(1); return x + s; };"
+      "function bar(s,t) { return foo(foo(s)); };"
+      "return bar;"
+      "})();");
+
+  T.CheckCall(T.Val(42 + 42 + 12), T.Val(12), T.Val(4));
+}
+
+
+TEST(InlineTwiceDependentDiamond) {
+  i::FLAG_turbo_inlining = true;
+  FunctionTester T(
+      "(function () {"
+      "function foo(s) { if (true) {"
+      "                  return 12 } else { return 13; } };"
+      "function bar(s,t) { return foo(foo(1)); };"
+      "return bar;"
+      "})();");
+
+  T.CheckCall(T.Val(12), T.undefined(), T.undefined());
+}
+
+
+TEST(InlineTwiceDependentDiamondReal) {
+  i::FLAG_turbo_inlining = true;
+  FunctionTester T(
+      "(function () {"
+      "var x = 41;"
+      "function foo(s) { AssertStackDepth(1); if (s % 2 == 0) {"
+      "                  return x - s } else { return x + s; } };"
+      "function bar(s,t) { return foo(foo(s)); };"
+      "return bar;"
+      "})();");
+
+  T.CheckCall(T.Val(-11), T.Val(11), T.Val(4));
+}