> Currently if we create a record it's fields are compared in their declaration
> order. This might be ineffective in cases when two objects have "heavy"
> fields equals to each other, but different "lightweight" fields (heavy and
> lightweight in terms of comparison) e.g. primitives, enums,
> nullable/non-nulls etc.
>
> If we have declared a record like
>
> public record MyRecord(String field1, int field2) {}
>
> It's equals() looks like:
>
> public final equals(Ljava/lang/Object;)Z
> L0
> LINENUMBER 3 L0
> ALOAD 0
> ALOAD 1
> INVOKEDYNAMIC
> equals(Lcom/caspianone/openbanking/productservice/controller/MyRecord;Ljava/lang/Object;)Z
> [
> // handle kind 0x6 : INVOKESTATIC
>
> java/lang/runtime/ObjectMethods.bootstrap(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/TypeDescriptor;Ljava/lang/Class;Ljava/lang/String;[Ljava/lang/invoke/MethodHandle;)Ljava/lang/Object;
> // arguments:
> com.caspianone.openbanking.productservice.controller.MyRecord.class,
> "field1;field2",
> // handle kind 0x1 : GETFIELD
>
> com/caspianone/openbanking/productservice/controller/MyRecord.field1(Ljava/lang/String;),
> // handle kind 0x1 : GETFIELD
> com/caspianone/openbanking/productservice/controller/MyRecord.field2(I)
> ]
> IRETURN
> L1
> LOCALVARIABLE this
> Lcom/caspianone/openbanking/productservice/controller/MyRecord; L0 L1 0
> LOCALVARIABLE o Ljava/lang/Object; L0 L1 1
> MAXSTACK = 2
> MAXLOCALS = 2
>
> This can be improved by rearranging the comparison order of the fields moving
> enums and primitives upper, and collections/arrays lower.
Sergey Tsypanov has updated the pull request incrementally with one additional
commit since the last revision:
Update src/java.base/share/classes/java/lang/runtime/ObjectMethods.java
Co-authored-by: ExE Boss <3889017+exe-b...@users.noreply.github.com>
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/17143/files
- new: https://git.openjdk.org/jdk/pull/17143/files/9c8ae4fb..158d9a83
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=17143&range=04
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=17143&range=03-04
Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
Patch: https://git.openjdk.org/jdk/pull/17143.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/17143/head:pull/17143
PR: https://git.openjdk.org/jdk/pull/17143
