Harden global variable accesses in the fast code generator.

Explicitly check that global variables do not have accessors or
interceptors in the fast code generator syntax checker.

Review URL: http://codereview.chromium.org/595022

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3828 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/fast-codegen.cc

@@ -220,8 +220,16 @@ void FastCodeGenSyntaxChecker::VisitVariableProxy(VariableProxy* expr) {
   if (info()->has_global_object()) {
     LookupResult lookup;
     info()->global_object()->Lookup(*expr->name(), &lookup);
-    if (!lookup.IsValid() || !lookup.IsDontDelete()) {
-      BAILOUT("Non-existing or deletable global variable");
+    if (!lookup.IsValid()) {
+      BAILOUT("Non-existing global variable");
+    }
+    // We do not handle global variables with accessors or interceptors.
+    if (lookup.type() != NORMAL) {
+      BAILOUT("Global variable with accessors or interceptors.");
+    }
+    // We do not handle deletable global variables.
+    if (!lookup.IsDontDelete()) {
+      BAILOUT("Deletable global variable");
     }
   }
 }
@@ -573,8 +581,10 @@ void FastCodeGenerator::VisitVariableProxy(VariableProxy* expr) {
   ASSERT(info()->has_global_object());
   LookupResult lookup;
   info()->global_object()->Lookup(*expr->name(), &lookup);
-  // We only support DontDelete properties for now.
+  // We only support normal (non-accessor/interceptor) DontDelete properties
+  // for now.
   ASSERT(lookup.IsValid());
+  ASSERT_EQ(NORMAL, lookup.type());
   ASSERT(lookup.IsDontDelete());
   Handle<Object> cell(info()->global_object()->GetPropertyCell(&lookup));
 

test/mjsunit/compiler/simple-global-access.js

@@ -31,21 +31,23 @@
 var g1 = 42;
 var g2 = 43;
 var g3 = 44;
+this.__defineGetter__("g4", function () { return 45; });
 
 function f1() { this.x = this.y = this.z = g1; }
 function f2() { this.x = g1; this.y = g2; this.z = g3; }
+function f3() { this.x = g4; }
 
-var o = {x:0, y:0, z:0, m1:f1, m2:f2}
-
-o.m1();
+var o = { x:0, y:0, z:0, test1:f1, test2:f2, test3:f3 }
 
+o.test1();
 assertEquals(42, o.x);
 assertEquals(42, o.y);
 assertEquals(42, o.z);
 
-
-o.m2();
-
+o.test2();
 assertEquals(42, o.x);
 assertEquals(43, o.y);
 assertEquals(44, o.z);
+
+o.test3();
+assertEquals(45, o.x);