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8221836: Avoid recalculating String.hash when zero

Browse source 
Co-authored-by: Peter Levart <peter.levart@gmail.com>
Reviewed-by: jrose, adinn
This commit is contained in:
Claes Redestad 2019-04-10 12:05:50 +02:00
parent d40aa622cf
commit 89a267ca46
6 changed files with 66 additions and 40 deletions
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8
src/hotspot/share/classfile/javaClasses.hpp
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@ -94,6 +94,7 @@ class java_lang_String : AllStatic {
private:
static int value_offset;
static int hash_offset;
static int hashIsZero_offset;
static int coder_offset;
static bool initialized;
@ -132,6 +133,10 @@ class java_lang_String : AllStatic {
assert(initialized && (hash_offset > 0), "Must be initialized");
return hash_offset;
}
static int hashIsZero_offset_in_bytes() {
assert(initialized && (hashIsZero_offset > 0), "Must be initialized");
return hashIsZero_offset;
}
static int coder_offset_in_bytes() {
assert(initialized && (coder_offset > 0), "Must be initialized");
return coder_offset;
@ -139,12 +144,11 @@ class java_lang_String : AllStatic {
static inline void set_value_raw(oop string, typeArrayOop buffer);
static inline void set_value(oop string, typeArrayOop buffer);
static inline void set_hash(oop string, unsigned int hash);
// Accessors
static inline typeArrayOop value(oop java_string);
static inline typeArrayOop value_no_keepalive(oop java_string);
static inline unsigned int hash(oop java_string);
static inline bool hash_is_set(oop string);
static inline bool is_latin1(oop java_string);
static inline int length(oop java_string);
static inline int length(oop java_string, typeArrayOop string_value);