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Cleanup in IC patching.

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BUG=
R=ulan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/25001005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17036 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
verwaest@chromium.org 2013-10-01 09:44:35 +00:00
parent 1324c94712
commit 14422a698f
3 changed files with 31 additions and 29 deletions
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20
src/ic.cc
View File

@ -182,9 +182,7 @@ Address IC::OriginalCodeAddress() const {
static bool TryRemoveInvalidPrototypeDependentStub(Code* target,
Object* receiver,
Object* name) {
if (target->is_keyed_load_stub() ||
target->is_keyed_call_stub() ||
target->is_keyed_store_stub()) {
if (target->is_keyed_stub()) {
// Determine whether the failure is due to a name failure.
if (!name->IsName()) return false;
Name* stub_name = target->FindFirstName();
@ -1102,9 +1100,8 @@ void IC::PatchCache(State state,
UpdateMonomorphicIC(receiver, code, name);
break;
case MONOMORPHIC:
// Only move to megamorphic if the target changes.
if (target() != *code) {
if (target()->is_load_stub() || target()->is_store_stub()) {
ASSERT(target() != *code);
if (!target()->is_keyed_stub()) {
bool is_same_handler = false;
{
DisallowHeapAllocation no_allocation;
@ -1125,23 +1122,22 @@ void IC::PatchCache(State state,
UpdateMegamorphicCache(receiver->map(), *name, *code);
set_target(*megamorphic_stub());
}
break;
case MEGAMORPHIC:
UpdateMegamorphicCache(receiver->map(), *name, *code);
break;
case POLYMORPHIC:
if (target()->is_load_stub() || target()->is_store_stub()) {
if (target()->is_keyed_stub()) {
// When trying to patch a polymorphic keyed stub with anything other
// than another polymorphic stub, go generic.
set_target(*generic_stub());
} else {
if (UpdatePolymorphicIC(state, receiver, name, code)) {
break;
}
CopyICToMegamorphicCache(name);
UpdateMegamorphicCache(receiver->map(), *name, *code);
set_target(*megamorphic_stub());
} else {
// When trying to patch a polymorphic keyed load/store element stub
// with anything other than another polymorphic stub, go generic.
set_target(*generic_stub());
}
break;
case DEBUG_STUB:

5
src/objects-inl.h
View File

@ -4028,6 +4028,11 @@ bool Code::is_inline_cache_stub() {
}
bool Code::is_keyed_stub() {
return is_keyed_load_stub() || is_keyed_store_stub() || is_keyed_call_stub();
}
bool Code::is_debug_stub() {
return ic_state() == DEBUG_STUB;
}

1
src/objects.h
View File

@ -4895,6 +4895,7 @@ class Code: public HeapObject {
inline bool is_compare_ic_stub() { return kind() == COMPARE_IC; }
inline bool is_compare_nil_ic_stub() { return kind() == COMPARE_NIL_IC; }
inline bool is_to_boolean_ic_stub() { return kind() == TO_BOOLEAN_IC; }
inline bool is_keyed_stub();
// [major_key]: For kind STUB or BINARY_OP_IC, the major key.
inline int major_key();