RFR: 8292596: Make SymbolHashMap a ResourceHashtable

[Harold Seigel]

On Thu, 18 Aug 2022 11:41:14 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> Please review this straightforward change to use ResourceHashtable for SymbolHashMap, which is used by the Class File Reconstituter.  The table maps Symbol* to constant pool indices for loaded classes (Symbol refcounting unnecessary as the class is not unloaded because it's in use).
> Tested with jvmti tests locally and tier 1-3.

src/hotspot/share/oops/constantPool.hpp line 921:

> 919:  private:
> 920:   // Default number of entries in the table
> 921:   ResourceHashtable<const Symbol*, u2, 256, ResourceObj::C_HEAP, mtSymbol, Symbol::compute_hash> _table;

The comment at new line 920, about 'number of entries' is no longer is accurate.

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PR: https://git.openjdk.org/jdk/pull/9917