Revision: 22409
Author: [email protected]
Date: Tue Jul 15 12:22:38 2014 UTC
Log: Revert "Remove failure tag.".
[email protected]
Review URL: https://codereview.chromium.org/398473002
http://code.google.com/p/v8/source/detail?r=22409
Modified:
/branches/bleeding_edge/src/globals.h
/branches/bleeding_edge/src/spaces.h
=======================================
--- /branches/bleeding_edge/src/globals.h Tue Jul 15 11:11:15 2014 UTC
+++ /branches/bleeding_edge/src/globals.h Tue Jul 15 12:22:38 2014 UTC
@@ -216,6 +216,12 @@
const intptr_t kCodeAlignment = 1 << kCodeAlignmentBits;
const intptr_t kCodeAlignmentMask = kCodeAlignment - 1;
+// Tag information for Failure.
+// TODO(yangguo): remove this from space owner calculation.
+const int kFailureTag = 3;
+const int kFailureTagSize = 2;
+const intptr_t kFailureTagMask = (1 << kFailureTagSize) - 1;
+
// Zap-value: The value used for zapping dead objects.
// Should be a recognizable hex value tagged as a failure.
@@ -531,6 +537,9 @@
#define HAS_SMI_TAG(value) \
((reinterpret_cast<intptr_t>(value) & kSmiTagMask) == kSmiTag)
+#define HAS_FAILURE_TAG(value) \
+ ((reinterpret_cast<intptr_t>(value) & kFailureTagMask) == kFailureTag)
+
// OBJECT_POINTER_ALIGN returns the value aligned as a HeapObject pointer
#define OBJECT_POINTER_ALIGN(value) \
(((value) + kObjectAlignmentMask) & ~kObjectAlignmentMask)
=======================================
--- /branches/bleeding_edge/src/spaces.h Tue Jul 15 11:11:15 2014 UTC
+++ /branches/bleeding_edge/src/spaces.h Tue Jul 15 12:22:38 2014 UTC
@@ -312,11 +312,20 @@
}
Space* owner() const {
- return owner_;
+ if ((reinterpret_cast<intptr_t>(owner_) & kFailureTagMask) ==
+ kFailureTag) {
+ return reinterpret_cast<Space*>(reinterpret_cast<intptr_t>(owner_) -
+ kFailureTag);
+ } else {
+ return NULL;
+ }
}
void set_owner(Space* space) {
- owner_ = space;
+ ASSERT((reinterpret_cast<intptr_t>(space) & kFailureTagMask) == 0);
+ owner_ = reinterpret_cast<Address>(space) + kFailureTag;
+ ASSERT((reinterpret_cast<intptr_t>(owner_) & kFailureTagMask) ==
+ kFailureTag);
}
base::VirtualMemory* reserved_memory() {
@@ -682,7 +691,10 @@
// If the chunk needs to remember its memory reservation, it is stored
here.
base::VirtualMemory reservation_;
- Space* owner_;
+ // The identity of the owning space. This is tagged as a failure
pointer, but
+ // no failure can be in an object, so this can be distinguished from any
entry
+ // in a fixed array.
+ Address owner_;
Heap* heap_;
// Used by the store buffer to keep track of which pages to mark scan-on-
// scavenge.
--
--
v8-dev mailing list
[email protected]
http://groups.google.com/group/v8-dev
---
You received this message because you are subscribed to the Google Groups "v8-dev" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
