$.line and $.stack counted lines in the run's expanded source. In code
that comes after an #include they gave lines that match no file, and
this included code in a file $.evalFile ran and code a named engine
kept from an earlier run.
Both now map each frame through the run's source maps, as uncaught
errors already were. $.stack writes each frame as name@file:line,
outermost first, with the run's name as the file of a script given as
source. Code that eval or Function compiled keeps the line of the
source they compiled, in [eval]; code whose place a named engine no
longer keeps is at line 0 of [unknown]. The 64-frame limit, [global]
and [anonymous] are unchanged.
Docs: docs/mcp.md, docs/target-app-parity.md.
$.fileName gave the file being run, so a function defined in a file
that #include inserted, in a file $.evalFile ran, or in an earlier run
of a named engine reported the calling file instead of its own.
- vectorcraft_js: HostItem::SiteGetter gives a getter the CallSite
(source tag, line, column) of the code that reads it.
- $.fileName maps that place through the run's source maps, or the
maps a named engine kept, to the file the code is in. It is empty in
code from a script given as source and in kept code whose map was
dropped. Code that eval or Function compiled still gets the file
being run.
Docs: docs/mcp.md, docs/target-app-parity.md.
A run whose script fails to compile defines no code, so its source map
is not kept and the places of earlier runs stay within the engine's
budget. docs/mcp.md and the progress line say so, and the progress line
names the errors that are reported without a line and column.
A function an earlier run of a named engine defined was reported without
a line, column or file when it threw in a later run. The realm now gives
each source a tag that stays the same from run to run (Realm::error_tag,
Realm::script_tag), and no two sources share one once the tags run out.
Each named engine keeps the source maps of its runs' scripts, included
files and $.evalFile files, within 8 MiB, dropping the oldest first, and
an error in kept code is reported at that file, line and column. The
report's name and the console line keep the calling run's name. For an
earlier script given as source, file is that run's name.
Docs: docs/mcp.md (Script engines), script.run params text,
docs/target-app-parity.md.
Resetting Folder.current for the next run of a named engine now drops the
last run's uncaught exception and $.error first, so memory only they held
no longer makes the reset fail with the heap limit on every later run.
A File an earlier run left open now counts as closed in a later run:
setting its encoding stores it for the next open, and reading the encoding
gives the stored one.
docs/mcp.md: engines stay on the thread that made them, and a
#targetengine line in a file $.evalFile runs makes that call throw a
SyntaxError when it runs.
A script whose first lines name an engine with `#targetengine name` (or
`//@targetengine name`) runs in that engine, and a later script that names
it sees the globals and functions earlier runs left, until the engine is
dropped or the session ends. A script without the line, and
`#targetengine main`, still get a new engine for each run.
- A session keeps at most 8 named engines, each with a 64 MiB heap. A run
that goes past the heap ends with the heap limit, and the engine stays
usable. Names are 1 to 64 bytes. The line comes once, in the script
itself, before its code and its #include lines.
- An uncaught error, a limit or script.stop puts the documents back and
keeps the globals the run set. An internal error drops the engine. A run
stopped at a dialog or left paused ends where it was before the engine
is kept. An error in a function an earlier run defined is reported
without a line and column.
- `vc`, `$`, `alert`, `confirm` and `prompt` are made once for each engine
and act for the run that calls them, including copies an earlier run kept
in a global. `vc.args` gives a read-only copy of the calling run's
`args`, and what a run sets on `$` lasts for that run only.
- `script.engines` lists the named engines with their heap, and
`script.engine.drop {name}` drops one. Scripts cannot run either.
- The engines stay on the thread that made them. A session used on
another thread starts there with no named engines, and the old ones are
dropped on their own thread.
- The web build has no named engines: a run that names one other than
`main` ends with an error before any of it runs.
- `Realm::end` ends a run where it is, `Realm::error_source` counts from
the realm's last script, and `HostItem::FrozenGetter` gives a frozen
value each time it is read.
- The script checker lists `#targetengine` as a supported directive.
Docs: docs/mcp.md, docs/target-app-parity.md, docs/gaps.md.
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