| commit | be09bdf589a5c25e5d8b68a546e9b84bc1a1977b | [log] [tgz] |
|---|---|---|
| author | Cherry Zhang <cherryyz@google.com> | Tue Dec 04 15:54:14 2018 -0500 |
| committer | Cherry Zhang <cherryyz@google.com> | Tue Dec 04 23:01:00 2018 +0000 |
| tree | f8ca2d62b7d3a2200a9b584759ae824e96b08a15 | |
| parent | 8a5797a00e0bbe483e88aab4830e8854af55b508 [diff] |
cmd/compile: fix unnamed parameter handling in escape analysis
For recursive functions, the parameters were iterated using
fn.Name.Defn.Func.Dcl, which does not include unnamed/blank
parameters. This results in a mismatch in formal-actual
assignments, for example,
func f(_ T, x T)
f(a, b) should result in { _=a, x=b }, but the escape analysis
currently sees only { x=a } and drops b on the floor. This may
cause b to not escape when it should (or a escape when it should
not).
Fix this by using fntype.Params().FieldSlice() instead, which
does include unnamed parameters.
Also add a sanity check that ensures all the actual parameters
are consumed.
Fixes #29000
Change-Id: Icd86f2b5d71e7ebbab76e375b7702f62efcf59ae
Reviewed-on: https://go-review.googlesource.com/c/152617
Reviewed-by: Keith Randall <khr@golang.org>
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