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With types2, some syntax.PosBases need to be constructed from export
data, which must only contain "trimmed" filenames (i.e., that they've
already been made absolute and undergone -trimpath processing).
However, it's not safe to apply trimming to a filename multiple times,
and in general we can't distinguish trimmed from untrimmed filenames.
This CL resolves this by adding a PosBase.Trimmed boolean so we can
distinguish whether the associated filename has been trimmed yet. This
is a bit hacky, but is the least bad solution I've come up with so
far.
This unblocks enabling -G=3 by default.
Change-Id: I7383becfb704680a36f7603e3246af38b21f100b
Reviewed-on: https://go-review.googlesource.com/c/go/+/343731
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
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Make position comparison generally available.
Change-Id: I94b6f658fa19a15b30574dbb2181879115c131a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/307215
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
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Allows syntax.Pos values to implement
interface {
Pos() Pos
}
Preparation step for types2 package.
Change-Id: Ib0f4d7695a3d066983567d680fc3b9256a31c31d
Reviewed-on: https://go-review.googlesource.com/c/go/+/263622
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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This change enables printing of relative column information if a
prior line directive specified a valid column. If there was no
line directive, or the line directive didn't specify a column
(or the -C flag is specified), no column information is shown in
file positions.
Implementation: Column values (and line values, for that matter)
that are zero are interpreted as "unknown". A line directive that
doesn't specify a column records that as a zero column in the
respective PosBase data structure. When computing relative columns,
a relative value is zero of the base's column value is zero.
When formatting a position, a zero column value is not printed.
To make this work without special cases, the PosBase for a file
is given a concrete (non-0:0) position 1:1 with the PosBase's
line and column also being 1:1. In other words, at the position
1:1 of a file, it's relative positions are starting with 1:1 as
one would expect.
In the package syntax, this requires self-recursive PosBases for
file bases, matching what cmd/internal/src.PosBase was already
doing. In src.PosBase, file and inlining bases also need to be
based at 1:1 to indicate "known" positions.
This change completes the cmd/compiler part of the issue below.
Fixes #22662.
Change-Id: I6c3d2dee26709581fba0d0261b1d12e93f1cba1a
Reviewed-on: https://go-review.googlesource.com/97375
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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For dependency reasons, the data structure implementing source
positions in the compiler is in cmd/internal/src. It contains
highly compiler specific details (e.g. inlining index).
This change introduces a parallel but simpler position
representation, defined in the syntax package, which removes
that package's dependency on cmd/internal/src, and also removes
the need to deal with certain filename-specific operations
(defined by the needs of the compiler) in the syntax package.
As a result, the syntax package becomes again a compiler-
independent, stand-alone package that at some point might
replace (or augment) the existing top-level go/* syntax-related
packages.
Additionally, line directives that update column numbers
are now correctly tracked through the syntax package, with
additional tests added. (The respective changes also need to
be made in cmd/internal/src; i.e., the compiler accepts but
still ignores column numbers in line directives.)
This change comes at the cost of a new position translation
step, but that step is cheap because it only needs to do real
work if the position base changed (i.e., if there is a new file,
or new line directive).
There is no noticeable impact on overall compiler performance
measured with `compilebench -count 5 -alloc`:
name old time/op new time/op delta
Template 220ms ± 8% 228ms ±18% ~ (p=0.548 n=5+5)
Unicode 119ms ±11% 113ms ± 5% ~ (p=0.056 n=5+5)
GoTypes 684ms ± 6% 677ms ± 3% ~ (p=0.841 n=5+5)
Compiler 3.19s ± 7% 3.01s ± 1% ~ (p=0.095 n=5+5)
SSA 7.92s ± 8% 7.79s ± 1% ~ (p=0.690 n=5+5)
Flate 141ms ± 7% 139ms ± 4% ~ (p=0.548 n=5+5)
GoParser 173ms ±12% 171ms ± 4% ~ (p=1.000 n=5+5)
Reflect 417ms ± 5% 411ms ± 3% ~ (p=0.548 n=5+5)
Tar 205ms ± 5% 198ms ± 2% ~ (p=0.690 n=5+5)
XML 232ms ± 4% 229ms ± 4% ~ (p=0.690 n=5+5)
StdCmd 28.7s ± 5% 28.2s ± 2% ~ (p=0.421 n=5+5)
name old user-time/op new user-time/op delta
Template 269ms ± 4% 265ms ± 5% ~ (p=0.421 n=5+5)
Unicode 153ms ± 7% 149ms ± 3% ~ (p=0.841 n=5+5)
GoTypes 850ms ± 7% 862ms ± 4% ~ (p=0.841 n=5+5)
Compiler 4.01s ± 5% 3.86s ± 0% ~ (p=0.190 n=5+4)
SSA 10.9s ± 4% 10.8s ± 2% ~ (p=0.548 n=5+5)
Flate 166ms ± 7% 167ms ± 6% ~ (p=1.000 n=5+5)
GoParser 204ms ± 8% 206ms ± 7% ~ (p=0.841 n=5+5)
Reflect 514ms ± 5% 508ms ± 4% ~ (p=0.548 n=5+5)
Tar 245ms ± 6% 244ms ± 3% ~ (p=0.690 n=5+5)
XML 280ms ± 4% 278ms ± 4% ~ (p=0.841 n=5+5)
name old alloc/op new alloc/op delta
Template 37.9MB ± 0% 37.9MB ± 0% ~ (p=0.841 n=5+5)
Unicode 28.8MB ± 0% 28.8MB ± 0% ~ (p=0.841 n=5+5)
GoTypes 113MB ± 0% 113MB ± 0% ~ (p=0.151 n=5+5)
Compiler 468MB ± 0% 468MB ± 0% -0.01% (p=0.032 n=5+5)
SSA 1.50GB ± 0% 1.50GB ± 0% ~ (p=0.548 n=5+5)
Flate 24.4MB ± 0% 24.4MB ± 0% ~ (p=1.000 n=5+5)
GoParser 30.7MB ± 0% 30.7MB ± 0% ~ (p=1.000 n=5+5)
Reflect 76.5MB ± 0% 76.5MB ± 0% ~ (p=0.548 n=5+5)
Tar 38.9MB ± 0% 38.9MB ± 0% ~ (p=0.222 n=5+5)
XML 41.6MB ± 0% 41.6MB ± 0% ~ (p=0.548 n=5+5)
name old allocs/op new allocs/op delta
Template 382k ± 0% 382k ± 0% +0.01% (p=0.008 n=5+5)
Unicode 343k ± 0% 343k ± 0% ~ (p=0.841 n=5+5)
GoTypes 1.19M ± 0% 1.19M ± 0% +0.01% (p=0.008 n=5+5)
Compiler 4.53M ± 0% 4.53M ± 0% +0.03% (p=0.008 n=5+5)
SSA 12.4M ± 0% 12.4M ± 0% +0.00% (p=0.008 n=5+5)
Flate 235k ± 0% 235k ± 0% ~ (p=0.079 n=5+5)
GoParser 318k ± 0% 318k ± 0% ~ (p=0.730 n=5+5)
Reflect 978k ± 0% 978k ± 0% ~ (p=1.000 n=5+5)
Tar 393k ± 0% 393k ± 0% ~ (p=0.056 n=5+5)
XML 405k ± 0% 405k ± 0% ~ (p=0.548 n=5+5)
name old text-bytes new text-bytes delta
HelloSize 672kB ± 0% 672kB ± 0% ~ (all equal)
CmdGoSize 7.12MB ± 0% 7.12MB ± 0% ~ (all equal)
name old data-bytes new data-bytes delta
HelloSize 133kB ± 0% 133kB ± 0% ~ (all equal)
CmdGoSize 390kB ± 0% 390kB ± 0% ~ (all equal)
name old exe-bytes new exe-bytes delta
HelloSize 1.07MB ± 0% 1.07MB ± 0% ~ (all equal)
CmdGoSize 11.2MB ± 0% 11.2MB ± 0% ~ (all equal)
Passes toolstash compare.
For #22662.
Change-Id: I19edb53dd9675af57f7122cb7dba2a6d8bdcc3da
Reviewed-on: https://go-review.googlesource.com/94515
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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