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test/cctest/compiler/test-run-variables.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;
+
+static const char* throws = NULL;
+
+static const char* load_tests[] = {
+    "var x = a; r = x",                       "123",       "0",
+    "var x = (r = x)",                        "undefined", "undefined",
+    "var x = (a?1:2); r = x",                 "1",         "2",
+    "const x = a; r = x",                     "123",       "0",
+    "const x = (r = x)",                      "undefined", "undefined",
+    "const x = (a?3:4); r = x",               "3",         "4",
+    "'use strict'; const x = a; r = x",       "123",       "0",
+    "'use strict'; const x = (r = x)",        throws,      throws,
+    "'use strict'; const x = (a?5:6); r = x", "5",         "6",
+    "'use strict'; let x = a; r = x",         "123",       "0",
+    "'use strict'; let x = (r = x)",          throws,      throws,
+    "'use strict'; let x = (a?7:8); r = x",   "7",         "8",
+    NULL};
+
+static const char* store_tests[] = {
+    "var x = 1; x = a; r = x",                     "123",  "0",
+    "var x = (a?(x=4,2):3); r = x",                "2",    "3",
+    "var x = (a?4:5); x = a; r = x",               "123",  "0",
+    "const x = 1; x = a; r = x",                   "1",    "1",
+    "const x = (a?(x=4,2):3); r = x",              "2",    "3",
+    "const x = (a?4:5); x = a; r = x",             "4",    "5",
+    // Assignments to 'const' are SyntaxErrors, handled by the parser,
+    // hence we cannot test them here because they are early errors.
+    "'use strict'; let x = 1; x = a; r = x",       "123",  "0",
+    "'use strict'; let x = (a?(x=4,2):3); r = x",  throws, "3",
+    "'use strict'; let x = (a?4:5); x = a; r = x", "123",  "0",
+    NULL};
+
+static const char* bind_tests[] = {
+    "if (a) { const x = a }; r = x;",            "123", "undefined",
+    "for (; a > 0; a--) { const x = a }; r = x", "123", "undefined",
+    // Re-initialization of variables other than legacy 'const' is not
+    // possible due to sane variable scoping, hence no tests here.
+    NULL};
+
+
+static void RunVariableTests(const char* source, const char* tests[]) {
+  FLAG_harmony_scoping = true;
+  EmbeddedVector<char, 512> buffer;
+
+  for (int i = 0; tests[i] != NULL; i += 3) {
+    SNPrintF(buffer, source, tests[i]);
+    PrintF("#%d: %s\n", i / 3, buffer.start());
+    FunctionTester T(buffer.start());
+
+    // Check function with non-falsey parameter.
+    if (tests[i + 1] != throws) {
+      Handle<Object> r = v8::Utils::OpenHandle(*CompileRun(tests[i + 1]));
+      T.CheckCall(r, T.Val(123), T.Val("result"));
+    } else {
+      T.CheckThrows(T.Val(123), T.Val("result"));
+    }
+
+    // Check function with falsey parameter.
+    if (tests[i + 2] != throws) {
+      Handle<Object> r = v8::Utils::OpenHandle(*CompileRun(tests[i + 2]));
+      T.CheckCall(r, T.Val(0.0), T.Val("result"));
+    } else {
+      T.CheckThrows(T.Val(0.0), T.Val("result"));
+    }
+  }
+}
+
+
+TEST(StackLoadVariables) {
+  const char* source = "(function(a,r) { %s; return r; })";
+  RunVariableTests(source, load_tests);
+}
+
+
+TEST(ContextLoadVariables) {
+  const char* source = "(function(a,r) { %s; function f() {x} return r; })";
+  RunVariableTests(source, load_tests);
+}
+
+
+TEST(StackStoreVariables) {
+  const char* source = "(function(a,r) { %s; return r; })";
+  RunVariableTests(source, store_tests);
+}
+
+
+TEST(ContextStoreVariables) {
+  const char* source = "(function(a,r) { %s; function f() {x} return r; })";
+  RunVariableTests(source, store_tests);
+}
+
+
+TEST(StackInitializeVariables) {
+  const char* source = "(function(a,r) { %s; return r; })";
+  RunVariableTests(source, bind_tests);
+}
+
+
+TEST(ContextInitializeVariables) {
+  const char* source = "(function(a,r) { %s; function f() {x} return r; })";
+  RunVariableTests(source, bind_tests);
+}
+
+
+TEST(SelfReferenceVariable) {
+  FunctionTester T("(function self() { return self; })");
+
+  T.CheckCall(T.function);
+  CompileRun("var self = 'not a function'");
+  T.CheckCall(T.function);
+}