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Unified Diff: src/contexts.cc

Issue 7886002: Revert "Clean up Context::Lookup and its uses." (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 9 years, 3 months ago
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Index: src/contexts.cc
diff --git a/src/contexts.cc b/src/contexts.cc
index 007d30de3f459a69faa92f72711db15e3f03350a..4f93abdff1d0c50a9058c2f35b934719cb4f8ef2 100644
--- a/src/contexts.cc
+++ b/src/contexts.cc
@@ -86,14 +86,14 @@ void Context::set_global_proxy(JSObject* object) {
Handle<Object> Context::Lookup(Handle<String> name,
ContextLookupFlags flags,
- int* index,
+ int* index_,
PropertyAttributes* attributes,
BindingFlags* binding_flags) {
Isolate* isolate = GetIsolate();
Handle<Context> context(this, isolate);
bool follow_context_chain = (flags & FOLLOW_CONTEXT_CHAIN) != 0;
- *index = -1;
+ *index_ = -1;
*attributes = ABSENT;
*binding_flags = MISSING_BINDING;
@@ -110,50 +110,70 @@ Handle<Object> Context::Lookup(Handle<String> name,
PrintF("\n");
}
- // 1. Check global objects, subjects of with, and extension objects.
- if (context->IsGlobalContext() ||
- context->IsWithContext() ||
- (context->IsFunctionContext() && context->has_extension())) {
- Handle<JSObject> object(JSObject::cast(context->extension()), isolate);
- // Context extension objects needs to behave as if they have no
- // prototype. So even if we want to follow prototype chains, we need
- // to only do a local lookup for context extension objects.
- if ((flags & FOLLOW_PROTOTYPE_CHAIN) == 0 ||
- object->IsJSContextExtensionObject()) {
- *attributes = object->GetLocalPropertyAttribute(*name);
+ // Check extension/with/global object.
+ if (!context->IsBlockContext() && context->has_extension()) {
+ if (context->IsCatchContext()) {
+ // Catch contexts have the variable name in the extension slot.
+ if (name->Equals(String::cast(context->extension()))) {
+ if (FLAG_trace_contexts) {
+ PrintF("=> found in catch context\n");
+ }
+ *index_ = Context::THROWN_OBJECT_INDEX;
+ *attributes = NONE;
+ *binding_flags = MUTABLE_IS_INITIALIZED;
+ return context;
+ }
} else {
- *attributes = object->GetPropertyAttribute(*name);
- }
- if (*attributes != ABSENT) {
- if (FLAG_trace_contexts) {
- PrintF("=> found property in context object %p\n",
- reinterpret_cast<void*>(*object));
+ ASSERT(context->IsGlobalContext() ||
+ context->IsFunctionContext() ||
+ context->IsWithContext());
+ // Global, function, and with contexts may have an object in the
+ // extension slot.
+ Handle<JSObject> extension(JSObject::cast(context->extension()),
+ isolate);
+ // Context extension objects needs to behave as if they have no
+ // prototype. So even if we want to follow prototype chains, we
+ // need to only do a local lookup for context extension objects.
+ if ((flags & FOLLOW_PROTOTYPE_CHAIN) == 0 ||
+ extension->IsJSContextExtensionObject()) {
+ *attributes = extension->GetLocalPropertyAttribute(*name);
+ } else {
+ *attributes = extension->GetPropertyAttribute(*name);
+ }
+ if (*attributes != ABSENT) {
+ // property found
+ if (FLAG_trace_contexts) {
+ PrintF("=> found property in context object %p\n",
+ reinterpret_cast<void*>(*extension));
+ }
+ return extension;
}
- return object;
}
}
- // 2. Check the context proper if it has slots.
+ // Check serialized scope information of functions and blocks. Only
+ // functions can have parameters, and a function name.
if (context->IsFunctionContext() || context->IsBlockContext()) {
- // Use serialized scope information of functions and blocks to search
- // for the context index.
+ // We may have context-local slots. Check locals in the context.
Handle<SerializedScopeInfo> scope_info;
if (context->IsFunctionContext()) {
scope_info = Handle<SerializedScopeInfo>(
context->closure()->shared()->scope_info(), isolate);
} else {
+ ASSERT(context->IsBlockContext());
scope_info = Handle<SerializedScopeInfo>(
SerializedScopeInfo::cast(context->extension()), isolate);
}
+
Variable::Mode mode;
- int slot_index = scope_info->ContextSlotIndex(*name, &mode);
- ASSERT(slot_index < 0 || slot_index >= MIN_CONTEXT_SLOTS);
- if (slot_index >= 0) {
+ int index = scope_info->ContextSlotIndex(*name, &mode);
+ ASSERT(index < 0 || index >= MIN_CONTEXT_SLOTS);
+ if (index >= 0) {
if (FLAG_trace_contexts) {
PrintF("=> found local in context slot %d (mode = %d)\n",
- slot_index, mode);
+ index, mode);
}
- *index = slot_index;
+ *index_ = index;
// Note: Fixed context slots are statically allocated by the compiler.
// Statically allocated variables always have a statically known mode,
// which is the mode with which they were declared when added to the
@@ -186,34 +206,22 @@ Handle<Object> Context::Lookup(Handle<String> name,
// Check the slot corresponding to the intermediate context holding
// only the function name variable.
- if (follow_context_chain && context->IsFunctionContext()) {
- int function_index = scope_info->FunctionContextSlotIndex(*name);
- if (function_index >= 0) {
+ if (follow_context_chain) {
+ int index = scope_info->FunctionContextSlotIndex(*name);
+ if (index >= 0) {
if (FLAG_trace_contexts) {
PrintF("=> found intermediate function in context slot %d\n",
- function_index);
+ index);
}
- *index = function_index;
+ *index_ = index;
*attributes = READ_ONLY;
*binding_flags = IMMUTABLE_IS_INITIALIZED;
return context;
}
}
-
- } else if (context->IsCatchContext()) {
- // Catch contexts have the variable name in the extension slot.
- if (name->Equals(String::cast(context->extension()))) {
- if (FLAG_trace_contexts) {
- PrintF("=> found in catch context\n");
- }
- *index = Context::THROWN_OBJECT_INDEX;
- *attributes = NONE;
- *binding_flags = MUTABLE_IS_INITIALIZED;
- return context;
- }
}
- // 3. Prepare to continue with the previous (next outermost) context.
+ // Proceed with the previous context.
if (context->IsGlobalContext()) {
follow_context_chain = false;
} else {
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