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When invoking a higher-order method and the value passed for the
SAM type is either a function literal or a parameter of the callsite
method, inline the higher-order method into the callee.
This is a first version, the heuristics will be refined further.
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Issue precise warnings when the inliner fails to inline or analyze a
callsite. Inline failures may have various causes, for example because
some class cannot be found on the classpath when building the call
graph. So we need to store problems that happen early in the optimizer
(when building the necessary data structures, call graph, ClassBTypes)
to be able to report them later in case the inliner accesses the
related data.
We use Either to store these warning messages. The commit introduces
an implicit class `RightBiasedEither` to make Either easier to use for
error propagation. This would be subsumed by a biased either in the
standard library (or could use a Validation).
The `info` of each ClassBType is now an Either. There are two cases
where the info is not available:
- The type info should be parsed from a classfile, but the class
cannot be found on the classpath
- SI-9111, the type of a Java source originating class symbol cannot
be completed
This means that the operations on ClassBType that query the info now
return an Either, too.
Each Callsite in the call graph now stores the source position of the
call instruction. Since the call graph is built after code generation,
we build a map from invocation nodes to positions during code gen and
query it when building the call graph.
The new inliner can report a large number of precise warnings when a
callsite cannot be inlined, or if the inlining metadata cannot be
computed precisely, for example due to a missing classfile.
The new -Yopt-warnings multi-choice option allows configuring inliner
warnings.
By default (no option provided), a one-line summary is issued in case
there were callsites annotated @inline that could not be inlined.
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One last flurry with the broom before I leave you slobs to code
in your own filth. Eliminated all the trailing whitespace I
could manage, with special prejudice reserved for the test cases
which depended on the preservation of trailing whitespace.
Was reminded I cannot figure out how to eliminate the trailing
space on the "scala> " prompt in repl transcripts. At least
reduced the number of such empty prompts by trimming transcript
code on the way in.
Routed ConsoleReporter's "printMessage" through a trailing
whitespace stripping method which might help futureproof
against the future of whitespace diseases. Deleted the up-to-40
lines of trailing whitespace found in various library files.
It seems like only yesterday we performed whitespace surgery
on the whole repo. Clearly it doesn't stick very well. I suggest
it would work better to enforce a few requirements on the way in.
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Partest will also read files/filters and files/kind/filters for
filter expressions (one per line, trimmed, leading #comments)
which are taken as regexes.
A test/files/filters is provided which attempts to quell HotSpot
warnings; the test for this commit requires it.
The elided lines can be revealed using the lemon juice of verbosity:
apm@mara:~/projects/snytt/test$ ./partest --verbose --show-diff files/run/t7198.scala
[snip]
>>>>> Transcripts from failed tests >>>>>
> partest files/run/t7198.scala
% scalac t7198.scala
[snip]
% filtering t7198-run.log
--Over the moon
--Java HotSpot(TM) 64-Bit Server VM warning: Failed to reserve shared memory (errno = 28).
The filtering operation is part of the transcript, which is printed on failure.
No attempt is made to be clever about not slurping the filters file a thousand times.
Previous literal patterns had to be updated because there's parens in them thar strings.
Future feature: pattern aliases, define once globally and invoke in test filters.
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Some scalac output is on stderr, and it's useful to see that
in the log file, especially for debugging.
Adds a line filter for logs, specified as "filter: pattern"
in the test source.
Backslashes are made forward only when detected as paths.
Test alignments:
Deprecations which do not pertain to the system under test
are corrected in the obvious way.
When testing deprecated API, suppress warnings by deprecating
the Test object.
Check files are updated with useful true warnings, instead of
running under -nowarn.
Language feature imports as required, instead of running under -language.
Language feature not required, such as casual use of postfix.
Heed useful warning.
Ignore broken warnings. (Rarely, -nowarn.)
Inliner warnings pop up under -optimise only, so for now, just
filter them out where they occur.
Debug output from the test required an update.
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Reversed the values of "is" and "is not" in recent for comprehension
deprecation.
DO NOT BLOW HATCH
REPEAT
DO NOT BLOW HATCH
"Roger! Hatch blown."
Events reveal it was all baby, no bathwater. It turns out that the
specification is merely a document, not infallible holy writ as we
had all previously believed. So it is not the ABSENCE of val in a for
comprehension assignment which is deprecated, it is the PRESENCE of val.
Summarizing again, more accurately perhaps:
for (x <- 1 to 5 ; y = x) yield x+y // THAT's the one
for (val x <- 1 to 5 ; y = x) yield x+y // fail
for (val x <- 1 to 5 ; val y = x) yield x+y // fail
for (x <- 1 to 5 ; val y = x) yield x+y // deprecated
No review.
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Fixing all the tests and source which still use the old for
comprehension syntax with vals where there are no vals and no vals where
there are vals. No review.
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Tail recursive implementation of mapConserve, submitted by Eric
Willigers. Closes #2411, review by malayeri.
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