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Unified Diff: src/ic/arm/handler-compiler-arm.cc

Issue 770373002: CheckPrototypes uses weak cells to embed maps. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 6 years ago
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Index: src/ic/arm/handler-compiler-arm.cc
diff --git a/src/ic/arm/handler-compiler-arm.cc b/src/ic/arm/handler-compiler-arm.cc
index 3a0756a77b24d9fe1542c2ca9912b56a1fa58634..8827d36bf26fa50d13601de6b2c212b80fd081c4 100644
--- a/src/ic/arm/handler-compiler-arm.cc
+++ b/src/ic/arm/handler-compiler-arm.cc
@@ -416,11 +416,11 @@ Register PropertyHandlerCompiler::CheckPrototypes(
__ ldr(reg, FieldMemOperand(scratch1, Map::kPrototypeOffset));
} else {
Register map_reg = scratch1;
+ __ ldr(map_reg, FieldMemOperand(reg, HeapObject::kMapOffset));
if (depth != 1 || check == CHECK_ALL_MAPS) {
- // CheckMap implicitly loads the map of |reg| into |map_reg|.
- __ CheckMap(reg, map_reg, current_map, miss, DONT_DO_SMI_CHECK);
- } else {
- __ ldr(map_reg, FieldMemOperand(reg, HeapObject::kMapOffset));
+ Handle<WeakCell> cell = Map::WeakCellForMap(current_map);
+ __ CmpWeakValue(map_reg, cell, scratch2);
+ __ b(ne, miss);
}
// Check access rights to the global object. This has to happen after
@@ -451,7 +451,10 @@ Register PropertyHandlerCompiler::CheckPrototypes(
if (depth != 0 || check == CHECK_ALL_MAPS) {
// Check the holder map.
- __ CheckMap(reg, scratch1, current_map, miss, DONT_DO_SMI_CHECK);
+ __ ldr(scratch1, FieldMemOperand(reg, HeapObject::kMapOffset));
+ Handle<WeakCell> cell = Map::WeakCellForMap(current_map);
+ __ CmpWeakValue(scratch1, cell, scratch2);
+ __ b(ne, miss);
}
// Perform security check for access to the global object.
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