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author | Cherry Zhang <cherryyz@google.com> | 2019-11-05 14:57:48 -0500 |
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committer | Cherry Zhang <cherryyz@google.com> | 2019-11-05 14:57:48 -0500 |
commit | bbae923d2032780851ba396147e9862d95ea4061 (patch) | |
tree | d3535a413deac679080230c4f56284feecdd9239 /test | |
parent | 7e71c9c3edbf5b7a8608d6f739c20420a618e0ab (diff) | |
parent | 9cf6c65ca302ef5300ec970640dfa446d45ac0b8 (diff) | |
download | go-git-bbae923d2032780851ba396147e9862d95ea4061.tar.gz |
cmd: merge branch 'dev.link' into master
In the dev.link branch we implemented the new object file format
and (part of) the linker improvements described in
https://golang.org/s/better-linker
The new object file is index-based and provides random access.
The linker maps the object files into read-only memory, and
access symbols on-demand using indices, as opposed to reading
all object files sequentially into the heap with the old format.
The linker carries symbol informations using indices (as opposed
to Symbol data structure). Symbols are created after the
reachability analysis, and only created for reachable symbols.
This reduces the linker's memory usage.
Linking cmd/compile, it creates ~25% fewer Symbols, and reduces
memory usage (inuse_space) by ~15%. (More results from Than.)
Currently, both the old and new object file formats are supported.
The old format is used by default. The new format can be turned
on by using the compiler/assembler/linker's -newobj flag. Note
that the flag needs to be specified consistently to all
compilations, i.e.
go build -gcflags=all=-newobj -asmflags=all=-newobj -ldflags=-newobj
Change-Id: Ia0e35306b5b9b5b19fdc7fa7c602d4ce36fa6abd
Diffstat (limited to 'test')
-rw-r--r-- | test/linkx.go | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/test/linkx.go b/test/linkx.go index 520a065182..4f85b241a9 100644 --- a/test/linkx.go +++ b/test/linkx.go @@ -29,4 +29,10 @@ func main() { fmt.Println(overwrite) fmt.Println(overwritecopy) fmt.Println(arraycopy[1]) + + // Check non-string symbols are not overwritten. + // This also make them used. + if b || x != 0 { + panic("b or x overwritten") + } } |