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8184762: ZapStackSegments should use optimized memset

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Reviewed-by: rkennke, mgerdin
This commit is contained in:
Aleksey Shipilev 2017-07-18 09:53:54 +02:00
parent cfd0efee84
commit e8485a5e09
2 changed files with 3 additions and 5 deletions
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1
hotspot/src/share/vm/utilities/globalDefinitions.hpp
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@ -949,6 +949,7 @@ const jint badInt = -3; // generic "bad int"
const long badAddressVal = -2; // generic "bad address" value
const long badOopVal = -1; // generic "bad oop" value
const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
const int badStackSegVal = 0xCA; // value used to zap stack segments
const int badHandleValue = 0xBC; // value used to zap vm handle area
const int badResourceValue = 0xAB; // value used to zap resource area
const int freeBlockPad = 0xBA; // value used to pad freed blocks.

7
hotspot/src/share/vm/utilities/stack.inline.hpp
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@ -27,6 +27,7 @@
#include "utilities/align.hpp"
#include "utilities/stack.hpp"
#include "utilities/copy.hpp"
template <MEMFLAGS F> StackBase<F>::StackBase(size_t segment_size, size_t max_cache_size,
size_t max_size):
@ -233,11 +234,7 @@ void Stack<E, F>::zap_segment(E* seg, bool zap_link_field) const
{
if (!ZapStackSegments) return;
const size_t zap_bytes = segment_bytes() - (zap_link_field ? 0 : sizeof(E*));
uint32_t* cur = (uint32_t*)seg;
const uint32_t* end = cur + zap_bytes / sizeof(uint32_t);
while (cur < end) {
*cur++ = 0xfadfaded;
}
Copy::fill_to_bytes(seg, zap_bytes, badStackSegVal);
}
#endif