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| author | Robert Griesemer <gri@golang.org> | 2018-02-20 20:14:51 -0800 |
|---|---|---|
| committer | Robert Griesemer <gri@golang.org> | 2018-02-21 21:06:36 +0000 |
| commit | e2a86b6bd9d0b0a2be2d6de7259f50eae73ff7e0 (patch) | |
| tree | e74012f7b49b947196dc0cfcabbddf3b219700a6 /src | |
| parent | e02d6bb621a6c452cbef37946467f94a0054f2b1 (diff) | |
| download | go-e2a86b6bd9d0b0a2be2d6de7259f50eae73ff7e0.tar.xz | |
cmd/compile/internal/syntax: simpler position base update for line directives (cleanup)
The existing code was somewhat convoluted and made several assumptions
about the encoding of position bases:
1) The position's base for a file contained a position whose base
pointed to itself (which is true but an implementation detail
of src.Pos).
2) Updating the position base for a line directive required finding
the base of the most recent's base position.
This change simply stores the file's position base and keeps using it
directly for each line directive (instead of getting it from the most
recently updated base).
Change-Id: I4d80da513bededb636eab0ce53257fda73f0dbc0
Reviewed-on: https://go-review.googlesource.com/95736
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/cmd/compile/internal/syntax/parser.go | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/src/cmd/compile/internal/syntax/parser.go b/src/cmd/compile/internal/syntax/parser.go index 5b7ac6cc40..8f9775afe7 100644 --- a/src/cmd/compile/internal/syntax/parser.go +++ b/src/cmd/compile/internal/syntax/parser.go @@ -16,23 +16,24 @@ const debug = false const trace = false type parser struct { - base *src.PosBase + file *src.PosBase errh ErrorHandler fileh FilenameHandler mode Mode scanner - first error // first error encountered - errcnt int // number of errors encountered - pragma Pragma // pragma flags + base *src.PosBase // current position base + first error // first error encountered + errcnt int // number of errors encountered + pragma Pragma // pragma flags fnest int // function nesting level (for error handling) xnest int // expression nesting level (for complit ambiguity resolution) indent []byte // tracing support } -func (p *parser) init(base *src.PosBase, r io.Reader, errh ErrorHandler, pragh PragmaHandler, fileh FilenameHandler, mode Mode) { - p.base = base +func (p *parser) init(file *src.PosBase, r io.Reader, errh ErrorHandler, pragh PragmaHandler, fileh FilenameHandler, mode Mode) { + p.file = file p.errh = errh p.fileh = fileh p.mode = mode @@ -65,6 +66,7 @@ func (p *parser) init(base *src.PosBase, r io.Reader, errh ErrorHandler, pragh P directives, ) + p.base = file p.first = nil p.errcnt = 0 p.pragma = 0 @@ -113,7 +115,7 @@ func (p *parser) updateBase(line, col uint, text string) { } // TODO(gri) pass column n2 to NewLinePragmaBase - p.base = src.NewLinePragmaBase(src.MakePos(p.base.Pos().Base(), line, col), filename, absFilename, uint(n) /*uint(n2)*/) + p.base = src.NewLinePragmaBase(src.MakePos(p.file, line, col), filename, absFilename, uint(n) /*uint(n2)*/) } func commentText(s string) string { |