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| author | Ian Lance Taylor <ian@gcc.gnu.org> | 2019-06-21 14:14:58 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2019-06-21 14:14:58 +0000 |
| commit | c9b236e5cafaea9d09ff8102140c72eb3d70e302 (patch) | |
| tree | daa083891ba7e3c96f4ac7419562dc67146822a6 /gcc/go/gofrontend/expressions.h | |
| parent | 050e182a757bdf227a7e2425f06f9e2fd4dff8cb (diff) | |
| download | gcc-c9b236e5cafaea9d09ff8102140c72eb3d70e302.zip gcc-c9b236e5cafaea9d09ff8102140c72eb3d70e302.tar.gz gcc-c9b236e5cafaea9d09ff8102140c72eb3d70e302.tar.bz2 | |
compiler: open code string slice expressions
Currently a string slice expression is implemented with a runtime
call __go_string_slice. Change it to open code it, which is more
efficient, and allows the backend to further optimize it.
Also omit the write barrier for length-only update (i.e.
s = s[:n]).
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/182540
From-SVN: r272549
Diffstat (limited to 'gcc/go/gofrontend/expressions.h')
| -rw-r--r-- | gcc/go/gofrontend/expressions.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gcc/go/gofrontend/expressions.h b/gcc/go/gofrontend/expressions.h index 38dee04..2c505a9 100644 --- a/gcc/go/gofrontend/expressions.h +++ b/gcc/go/gofrontend/expressions.h @@ -3133,6 +3133,18 @@ class String_index_expression : public Expression string() const { return this->string_; } + // Return the index of a simple index expression, or the start index + // of a slice expression. + Expression* + start() const + { return this->start_; } + + // Return the end index of a slice expression. This is NULL for a + // simple index expression. + Expression* + end() const + { return this->end_; } + protected: int do_traverse(Traverse*); |