mirror of https://github.com/golang/go.git
doc: add most major changes and most net changes to go1.5.html
Change-Id: Ied305480f22b60767c4628e5a31236ac01eafc86 Reviewed-on: https://go-review.googlesource.com/11825 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Rob Pike
parent
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commit
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162
doc/go1.5.html
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doc/go1.5.html
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@ -215,9 +215,9 @@ On NaCl, Go 1.5 requires SDK version pepper-39 or above because it now uses the
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<code>get_random_bytes</code> system call.
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</p>
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<pre>
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Tools:
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<h2 id="tools">Tools</h2>
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<pre>
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build: external linking support for windows (https://golang.org/cl/7163, 7282, 7283, 7284, 7534, 7535)
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cmd/cover: tool now lives in the standard repository (https://golang.org/cl/9560)
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cmd/gc: constant arithmetic is based on math/big (https://golang.org/cl/7830, 7851, 7857, 8426, 7858, 7912, 8171)
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@ -241,29 +241,6 @@ cmd/gc: add -dynlink option (for amd64 only)
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cmd/ld: add -buildmode option
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cmd/trace: new command to view traces (https://golang.org/cl/3601)
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Performance:
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cmd/gc: evaluate concrete == interface without allocating (https://golang.org/cl/2096)
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cmd/gc: optimize memclr of slices and arrays (https://golang.org/cl/2520)
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cmd/gc: transform closure calls to function calls (https://golang.org/cl/4050)
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cmd/gc: transitive inlining (https://golang.org/cl/5952)
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cmd/gc, runtime: speed up some cases of _, ok := i.(T) (https://golang.org/cl/7697)
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cmd/gc: speed up large string switches (https://golang.org/cl/7698)
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cmd/gc: inline x := y.(*T) and x, ok := y.(*T) (https://golang.org/cl/7862)
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cmd/gc: allocate backing storage for non-escaping interfaces on stack (https://golang.org/cl/8201)
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encoding/xml: avoid an allocation for tags without attributes (https://golang.org/cl/4160)
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image: many optimizations
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runtime: add ARM runtime.cmpstring and bytes.Compare (https://golang.org/cl/8010)
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runtime: do not scan maps when k/v do not contain pointers (https://golang.org/cl/3288)
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runtime: reduce thrashing of gs between ps (https://golang.org/cl/9872)
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sort: number of Sort performance optimizations (https://golang.org/cl/2100, https://golang.org/cl/2614, ...)
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strconv: optimize decimal to string conversion (https://golang.org/cl/2105)
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strconv: optimize float to string conversion (https://golang.org/cl/5600)
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sync: add active spinning to Mutex (https://golang.org/cl/5430)
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math/big: faster assembly kernels for amd64 and 386 (https://golang.org/cl/2503, https://golang.org/cl/2560)
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math/big: faster "pure Go" kernels for platforms w/o assembly kernels (https://golang.org/cl/2480)
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regexp: port RE2's bitstate backtracker to the regexp package (https://golang.org/cl/2153)
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Assembler:
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New cmd/asm tool (now use go tool asm, not go tool 6a)
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@ -288,6 +265,32 @@ Also expression evaluation now uses uint64s instead of signed integers and the
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precedence of operators is now Go-like rather than C-like.
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</pre>
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<h2 id="performance">Performance</h2>
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<pre>
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cmd/gc: evaluate concrete == interface without allocating (https://golang.org/cl/2096)
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cmd/gc: optimize memclr of slices and arrays (https://golang.org/cl/2520)
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cmd/gc: transform closure calls to function calls (https://golang.org/cl/4050)
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cmd/gc: transitive inlining (https://golang.org/cl/5952)
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cmd/gc, runtime: speed up some cases of _, ok := i.(T) (https://golang.org/cl/7697)
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cmd/gc: speed up large string switches (https://golang.org/cl/7698)
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cmd/gc: inline x := y.(*T) and x, ok := y.(*T) (https://golang.org/cl/7862)
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cmd/gc: allocate backing storage for non-escaping interfaces on stack (https://golang.org/cl/8201)
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encoding/xml: avoid an allocation for tags without attributes (https://golang.org/cl/4160)
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image: many optimizations
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runtime: add ARM runtime.cmpstring and bytes.Compare (https://golang.org/cl/8010)
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runtime: do not scan maps when k/v do not contain pointers (https://golang.org/cl/3288)
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runtime: reduce thrashing of gs between ps (https://golang.org/cl/9872)
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sort: number of Sort performance optimizations (https://golang.org/cl/2100, https://golang.org/cl/2614, ...)
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strconv: optimize decimal to string conversion (https://golang.org/cl/2105)
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strconv: optimize float to string conversion (https://golang.org/cl/5600)
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sync: add active spinning to Mutex (https://golang.org/cl/5430)
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math/big: faster assembly kernels for amd64 and 386 (https://golang.org/cl/2503, https://golang.org/cl/2560)
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math/big: faster "pure Go" kernels for platforms w/o assembly kernels (https://golang.org/cl/2480)
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regexp: port RE2's bitstate backtracker to the regexp package (https://golang.org/cl/2153)
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</pre>
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<h3 id="library">Core library</h3>
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<h3 id="flag">Flag</h3>
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@ -345,6 +348,53 @@ values produce the same results as the corresponding IEEE-754
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arithmetic on those values.
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</p>
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<h3 id="go_types">Go types</h3>
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<p>
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The <a href="/pkg/go/types/"><code>go/types</code></a> package
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up to now has been maintained in the <code>golang.org/x</code>
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repository; as of Go 1.5 it has been relocated to the main repository.
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The code at the old location is now deprecated.
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There is also a modest API change in the package, discussed below.
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</p>
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<p>
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Associated with this move, the
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<a href="/pkg/go/constant/"><code>go/constant</code></a>
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package also moved to the main repository;
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it was <code>golang.org/x/tools/exact</code> before.
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The <a href="/pkg/go/importer/"><code>go/importer</code></a> package
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also moved to the main repository,
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as well as some tools described above.
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</p>
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<h3 id="net">Net</h3>
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<p>
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The DNS resolver in the net package has almost always used <code>cgo</code> to access
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the system interface.
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A change in Go 1.5 means that on most Unix systems DNS resolution
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will no longer require <code>cgo</code>, which simplifies execution
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on those platforms.
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Now, if the system's networking configuration permits, the native Go resolver
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will suffice.
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The important effect of this change is that each DNS resolution occupies a goroutine
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rather than a thread,
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so a program with multiple outstanding DNS requests will consume fewer operating
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system resources.
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</p>
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<p>
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The decision of how to run the resolver applies at run time, not build time.
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The <code>netgo</code> build tag that has been used to enforce the use
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of the Go resolver is no longer necessary, although it still works.
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</p>
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<p>
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This change applies to Unix systems only.
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Windows, Mac OS X, and Plan 9 systems behave as before.
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</p>
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<h3 id="reflect">Reflect</h3>
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<p>
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@ -352,7 +402,7 @@ The <a href="/pkg/reflect/"><code>reflect</code></a> package
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has two new functions: <a href="/pkg/reflect/#ArrayOf"><code>ArrayOf</code></a>
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and <a href="/pkg/reflect/#FuncOf"><code>FuncOf</code></a>.
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These functions, analogous to the extant
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<a href="/pkg/reflect/#SliceOf"><code>SliceOf</code></a>function,
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<a href="/pkg/reflect/#SliceOf"><code>SliceOf</code></a> function,
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create new types at runtime to describe arrays and functions.
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</p>
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@ -488,6 +538,16 @@ reserves <code>GOARCH</code> values for a number of architectures that Go might
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This is not a promise that it will.
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</li>
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<li>
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The (newly migrated) <a href="/pkg/go/types/"><code>go/types</code></a>
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package allows one to control the prefix attached to package-level names using
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the new <a href="/pkg/go/types/#Qualifier"><code>Qualifier</code></a>
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function type as an argument to several functions. This is an API change for
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the package, but since it is new to the core, it is not breaking the Go 1 compatibility
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rules since code that uses the package must explicitly ask for it at its new location.
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TODO: There should be a gofix for this.
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</li>
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<li>
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The <a href="/pkg/io/"><code>io</code></a> package
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adds a <a href="/pkg/io/#CopyBuffer"><code>CopyBuffer</code></a> function
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@ -530,15 +590,23 @@ package that implements the quoted-printable encoding defined by RFC 2045.
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</li>
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<li>
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TODO net: add sequential and RFC 6555-compliant TCP dialing (https://golang.org/cl/8768)
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Go 1.5's <a href="/pkg/net/"><code>net</code></a> package
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adds RFC-6555-compliant dialing for sites with multiple TCP
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addresses listed in DNS.
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A new <code>DualStack</code> field
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in <a href="/pkg/net/#Dialer"><code>Dialer</code></a> enables the feature.
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</li>
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<li>
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TODO net: add Source field to OpError (https://go-review.googlesource.com/9231)
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</li>
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<li>
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TODO net: fix inconsistent errors (https://golang.org/cl/9236)
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A number of inconsistencies in the types returned by errors in the
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<a href="/pkg/net/"><code>net</code></a> package have been
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tidied up.
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Most now return an
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<a href="/pkg/net/#OpError"><code>OpError</code></a> value
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with more information than before.
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Also, the <a href="/pkg/net/#OpError"><code>OpError</code></a>
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type now includes a <code>Source</code> field that holds the local
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network address.
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</li>
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<li>
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@ -546,27 +614,39 @@ TODO net: add SocketConn, SocketPacketConn (https://golang.org/cl/9275)
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</li>
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<li>
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TODO net: use Go's DNS resolver when system configuration permits (https://golang.org/cl/8945)
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The <a href="/pkg/net/http/"><code>net/http</code></a> package now
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has support for setting trailers from a server <a href="/pkg/net/http/#Handler"><code>Handler</code></a>.
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For details, see the documentation for
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<a href="/pkg/net/http/#ResponseWriter"><code>ResponseWriter</code></a>.
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</li>
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<li>
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TODO net/http: support for setting trailers from a server Handler (https://golang.org/cl/2157)
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Also in the <a href="/pkg/net/http/"><code>net/http</code></a> package,
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there is code to ignore the zero <a href="/pkg/time/#Time"><code>Time</code></a> value
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in the <a href="/pkg/net/#ServeContent"><code>ServeContent</code></a> function.
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As of Go 1.5, it now also ignores a time value equal to the Unix epoch.
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</li>
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<li>
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TODO net/http: ignore the Unix epoch time in ServeContent (https://golang.org/cl/7915)
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The <a href="/pkg/net/http/cgi/"><code>net/http/cgi</code></a> package
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had a bug that mishandled the values of the environment variables
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<code>REMOTE_ADDR</code> ad <code>REMOTE_HOST</code>.
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This has been fixed.
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Also, starting with Go 1.5 the package sets the <code>REMOTE_PORT</code>
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variable.
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</li>
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<li>
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TODO net/http/cgi: fix REMOTE_ADDR, REMOTE_HOST, add REMOTE_PORT (https://golang.org/cl/4933)
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The <a href="/pkg/net/mail/"><code>net/mail</code></a> package
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adds a <a href="/pkg/net/mail/#AddressParser"><code>AddressParser</code></a>
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type that can parse mail addresses.
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</li>
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<li>
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TODO net/mail: adds AddressParser type (https://golang.org/cl/10392)
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</li>
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<li>
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TODO net/smtp: add TLSConnectionState accessor (https://golang.org/cl/2151)
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The <a href="/pkg/net/smtp/"><code>net/smtp</code></a> package
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now has a <a href="/pkg/net/smtp/#Client.TLSConnectionState"><code>TLSConnectionState</code></a>
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accessor to the <a href="/pkg/net/smtp/#Client"><code>Client</code></a>
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type that returns the client's TLS state.
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</li>
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<li>
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