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8223136: Move compressed oops functions to CompressedOops class

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Reviewed-by: coleenp, lkorinth
This commit is contained in:
Stefan Karlsson 2019-05-09 14:26:03 +02:00
parent 73227d0b83
commit 5a8ba256df
68 changed files with 1071 additions and 797 deletions
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92
src/hotspot/share/oops/compressedOops.inline.hpp
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@ -27,6 +27,7 @@
#include "gc/shared/collectedHeap.hpp"
#include "memory/universe.hpp"
#include "oops/compressedOops.hpp"
#include "oops/oop.hpp"
// Functions for encoding and decoding compressed oops.
@ -39,46 +40,69 @@
// offset from the heap base. Saving the check for null can save instructions
// in inner GC loops so these are separated.
namespace CompressedOops {
inline bool is_null(oop obj) { return obj == NULL; }
inline bool is_null(narrowOop obj) { return obj == 0; }
inline oop CompressedOops::decode_raw(narrowOop v) {
return (oop)(void*)((uintptr_t)base() + ((uintptr_t)v << shift()));
}
inline oop decode_not_null(narrowOop v) {
assert(!is_null(v), "narrow oop value can never be zero");
address base = Universe::narrow_oop_base();
int shift = Universe::narrow_oop_shift();
oop result = (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift));
assert(check_obj_alignment(result), "address not aligned: " INTPTR_FORMAT, p2i((void*) result));
return result;
inline oop CompressedOops::decode_not_null(narrowOop v) {
assert(!is_null(v), "narrow oop value can never be zero");
oop result = decode_raw(v);
assert(check_obj_alignment(result), "address not aligned: " INTPTR_FORMAT, p2i((void*) result));
return result;
}
inline oop CompressedOops::decode(narrowOop v) {
return is_null(v) ? (oop)NULL : decode_not_null(v);
}
inline narrowOop CompressedOops::encode_not_null(oop v) {
assert(!is_null(v), "oop value can never be zero");
assert(check_obj_alignment(v), "Address not aligned");
assert(Universe::heap()->is_in_reserved(v), "Address not in heap");
uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base(), 1));
assert(OopEncodingHeapMax > pd, "change encoding max if new encoding");
uint64_t result = pd >> shift();
assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow");
assert(oopDesc::equals_raw(decode(result), v), "reversibility");
return (narrowOop)result;
}
inline narrowOop CompressedOops::encode(oop v) {
return is_null(v) ? (narrowOop)0 : encode_not_null(v);
}
static inline bool check_alignment(Klass* v) {
return (intptr_t)v % KlassAlignmentInBytes == 0;
}
inline Klass* CompressedKlassPointers::decode_raw(narrowKlass v) {
return (Klass*)(void*)((uintptr_t)base() +((uintptr_t)v << shift()));
}
inline oop decode(narrowOop v) {
return is_null(v) ? (oop)NULL : decode_not_null(v);
}
inline Klass* CompressedKlassPointers::decode_not_null(narrowKlass v) {
assert(!is_null(v), "narrow klass value can never be zero");
Klass* result = decode_raw(v);
assert(check_alignment(result), "address not aligned: " INTPTR_FORMAT, p2i((void*) result));
return result;
}
inline narrowOop encode_not_null(oop v) {
assert(!is_null(v), "oop value can never be zero");
assert(check_obj_alignment(v), "Address not aligned");
assert(Universe::heap()->is_in_reserved(v), "Address not in heap");
address base = Universe::narrow_oop_base();
int shift = Universe::narrow_oop_shift();
uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1));
assert(OopEncodingHeapMax > pd, "change encoding max if new encoding");
uint64_t result = pd >> shift;
assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow");
assert(oopDesc::equals_raw(decode(result), v), "reversibility");
return (narrowOop)result;
}
inline Klass* CompressedKlassPointers::decode(narrowKlass v) {
return is_null(v) ? (Klass*)NULL : decode_not_null(v);
}
inline narrowOop encode(oop v) {
return is_null(v) ? (narrowOop)0 : encode_not_null(v);
}
inline narrowKlass CompressedKlassPointers::encode_not_null(Klass* v) {
assert(!is_null(v), "klass value can never be zero");
assert(check_alignment(v), "Address not aligned");
uint64_t pd = (uint64_t)(pointer_delta((void*)v, base(), 1));
assert(KlassEncodingMetaspaceMax > pd, "change encoding max if new encoding");
uint64_t result = pd >> shift();
assert((result & CONST64(0xffffffff00000000)) == 0, "narrow klass pointer overflow");
assert(decode(result) == v, "reversibility");
return (narrowKlass)result;
}
// No conversions needed for these overloads
inline oop decode_not_null(oop v) { return v; }
inline oop decode(oop v) { return v; }
inline narrowOop encode_not_null(narrowOop v) { return v; }
inline narrowOop encode(narrowOop v) { return v; }
inline narrowKlass CompressedKlassPointers::encode(Klass* v) {
return is_null(v) ? (narrowKlass)0 : encode_not_null(v);
}
#endif // SHARE_OOPS_COMPRESSEDOOPS_INLINE_HPP