From eee93ec99bfd38336fdd507b7dd21b015e7ba88a Mon Sep 17 00:00:00 2001
From: "yurys@chromium.org"
 <yurys@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Mon, 15 Oct 2012 10:15:25 +0000
Subject: [PATCH] Allow evals for debugger even if they are prohibited in the
 debugee context.

BUG=154733
Review URL: https://codereview.chromium.org/11111015

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12726 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/runtime.cc            | 13 +++++++
 test/cctest/test-debug.cc | 94 ++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 106 insertions(+), 1 deletion(-)

diff --git a/src/runtime.cc b/src/runtime.cc
index cd77c00..356b6fc 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -11793,6 +11793,15 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugEvaluate) {
                                                 scope_info,
                                                 function_context);
 
+  // Check if eval is blocked in the context and temporarily allow it
+  // for debugger.
+  Handle<Context> native_context = Handle<Context>(context->native_context());
+  bool eval_disabled =
+      native_context->allow_code_gen_from_strings()->IsFalse();
+  if (eval_disabled) {
+    native_context->set_allow_code_gen_from_strings(
+        isolate->heap()->true_value());
+  }
   // Invoke the evaluation function and return the result.
   Handle<Object> argv[] = { arguments, source };
   Handle<Object> result =
@@ -11801,6 +11810,10 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugEvaluate) {
                       ARRAY_SIZE(argv),
                       argv,
                       &has_pending_exception);
+  if (eval_disabled) {
+    native_context->set_allow_code_gen_from_strings(
+        isolate->heap()->false_value());
+  }
   if (has_pending_exception) return Failure::Exception();
 
   // Skip the global proxy as it has no properties and always delegates to the
diff --git a/test/cctest/test-debug.cc b/test/cctest/test-debug.cc
index e00ad5a..f2253e3 100644
--- a/test/cctest/test-debug.cc
+++ b/test/cctest/test-debug.cc
@@ -2381,7 +2381,7 @@ TEST(DebuggerStatementBreakpoint) {
 }
 
 
-// Thest that the evaluation of expressions when a break point is hit generates
+// Test that the evaluation of expressions when a break point is hit generates
 // the correct results.
 TEST(DebugEvaluate) {
   v8::HandleScope scope;
@@ -2497,6 +2497,98 @@ TEST(DebugEvaluate) {
   CheckDebuggerUnloaded();
 }
 
+
+int debugEventCount = 0;
+static void CheckDebugEvent(const v8::Debug::EventDetails& eventDetails) {
+  if (eventDetails.GetEvent() == v8::Break) ++debugEventCount;
+}
+
+// Test that the conditional breakpoints work event if code generation from
+// strings is prohibited in the debugee context.
+TEST(ConditionalBreakpointWithCodeGenerationDisallowed) {
+  v8::HandleScope scope;
+  DebugLocalContext env;
+  env.ExposeDebug();
+
+  v8::Debug::SetDebugEventListener2(CheckDebugEvent);
+
+  v8::Local<v8::Function> foo = CompileFunction(&env,
+    "function foo(x) {\n"
+    "  var s = 'String value2';\n"
+    "  return s + x;\n"
+    "}",
+    "foo");
+
+  // Set conditional breakpoint with condition 'true'.
+  CompileRun("debug.Debug.setBreakPoint(foo, 2, 0, 'true')");
+
+  debugEventCount = 0;
+  env->AllowCodeGenerationFromStrings(false);
+  foo->Call(env->Global(), 0, NULL);
+  CHECK_EQ(1, debugEventCount);
+
+  v8::Debug::SetDebugEventListener2(NULL);
+  CheckDebuggerUnloaded();
+}
+
+
+bool checkedDebugEvals = true;
+v8::Handle<v8::Function> checkGlobalEvalFunction;
+v8::Handle<v8::Function> checkFrameEvalFunction;
+static void CheckDebugEval(const v8::Debug::EventDetails& eventDetails) {
+  if (eventDetails.GetEvent() == v8::Break) {
+    ++debugEventCount;
+    v8::HandleScope handleScope;
+
+    v8::Handle<v8::Value> args[] = { eventDetails.GetExecutionState() };
+    CHECK(checkGlobalEvalFunction->Call(
+        eventDetails.GetEventContext()->Global(), 1, args)->IsTrue());
+    CHECK(checkFrameEvalFunction->Call(
+        eventDetails.GetEventContext()->Global(), 1, args)->IsTrue());
+  }
+}
+
+// Test that the evaluation of expressions when a break point is hit generates
+// the correct results in case code generation from strings is disallowed in the
+// debugee context.
+TEST(DebugEvaluateWithCodeGenerationDisallowed) {
+  v8::HandleScope scope;
+  DebugLocalContext env;
+  env.ExposeDebug();
+
+  v8::Debug::SetDebugEventListener2(CheckDebugEval);
+
+  v8::Local<v8::Function> foo = CompileFunction(&env,
+    "var global = 'Global';\n"
+    "function foo(x) {\n"
+    "  var local = 'Local';\n"
+    "  debugger;\n"
+    "  return local + x;\n"
+    "}",
+    "foo");
+  checkGlobalEvalFunction = CompileFunction(&env,
+    "function checkGlobalEval(exec_state) {\n"
+    "  return exec_state.evaluateGlobal('global').value() === 'Global';\n"
+    "}",
+    "checkGlobalEval");
+
+  checkFrameEvalFunction = CompileFunction(&env,
+    "function checkFrameEval(exec_state) {\n"
+    "  return exec_state.frame(0).evaluate('local').value() === 'Local';\n"
+    "}",
+    "checkFrameEval");
+  debugEventCount = 0;
+  env->AllowCodeGenerationFromStrings(false);
+  foo->Call(env->Global(), 0, NULL);
+  CHECK_EQ(1, debugEventCount);
+
+  checkGlobalEvalFunction.Clear();
+  checkFrameEvalFunction.Clear();
+  v8::Debug::SetDebugEventListener2(NULL);
+  CheckDebuggerUnloaded();
+}
+
+
 // Copies a C string to a 16-bit string.  Does not check for buffer overflow.
 // Does not use the V8 engine to convert strings, so it can be used
 // in any thread.  Returns the length of the string.
-- 
2.7.4