1. We define struct napi_env__ to include the isolate, the last
exception, and the info about the last error.
2. We instantiate one struct napi_env__ during module registration and
we pass it into the FunctionCallbackInfo for all subsequent entries into
N-API when we create functions/accessors/finalizers.
Once module unloading will be supported we shall have to delete the
napi_env we create during module init.
There is a clear separation between public and private API wrt. env:
1. Public APIs assert that env is not nullptr as their first action.
2. Private APIs need not validate env. They assume it's not nullptr.
PR-URL: https://github.com/nodejs/node/pull/12195
Fixes: https://github.com/nodejs/abi-stable-node/issues/198
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Gabriel Schulhof