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[release-branch.go1.8] all: merge master into release-branch.go1.8 

78860b2ad2 cmd/go: don't reject ./... matching top-level file outside GOPATH
2b283cedef database/sql: fix race when canceling queries immediately
1cf08182f9 go/printer: fix format with leading comments in composite literal
b531eb3062 runtime: reorder modules so main.main comes first
165cfbc409 database/sql: let tests wait for db pool to come to expected state
ea73649343 doc: update gccgo docs
1db16711f5 doc: clarify what to do with Go 1.4 when installing from source
3717b429f2 doc: note that plugins are not fully baked
98842cabb6 net/http: don't send body on redirects for 301, 302, 303 when GetBody is set
314180e7f6 net/http: fix a nit
aad06da2b9 cmd/link: mark DWARF function symbols as reachable
be9dcfec29 doc: mention testing.MainStart signature change
a96e117a58 runtime: amd64, use 4-byte ops for memmove of 4 bytes
4cce27a3fa cmd/compile: fix constant propagation through s390x MOVDNE instructions
1be957d703 misc/cgo/test: pass current environment to syscall.Exec
ec654e2251 misc/cgo/test: fix test when using GCC 7
256a605faa cmd/compile: don't use nilcheck information until the next block
e8d5989ed1 cmd/compile: fix compilebench -alloc
ea7d9e6a52 runtime: check for nil g and m in msanread

Change-Id: I61d508d4f0efe4b72e7396645c8ad6088d2bfa6e
This commit is contained in:
Chris Broadfoot 2017-01-26 09:24:20 -08:00
parent 59f181b6fd 78860b2ad2
commit 2f6c20b46c
32 changed files with 621 additions and 175 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
doc/gccgo_install.html
View File

@ -52,6 +52,19 @@ user libraries. The Go 1.4 runtime is not fully merged, but that
should not be visible to Go programs.
</p>
<p>
The GCC 6 releases include a complete implementation of the Go 1.6.1
user libraries. The Go 1.6 runtime is not fully merged, but that
should not be visible to Go programs.
</p>
<p>
The GCC 7 releases are expected to include a complete implementation
of the Go 1.8 user libraries. As with earlier releases, the Go 1.8
runtime is not fully merged, but that should not be visible to Go
programs.
</p>
<h2 id="Source_code">Source code</h2>
<p>
@ -160,23 +173,6 @@ make
make install
</pre>
<h3 id="Ubuntu">A note on Ubuntu</h3>
<p>
Current versions of Ubuntu and versions of GCC before 4.8 disagree on
where system libraries and header files are found. This is not a
gccgo issue. When building older versions of GCC, setting these
environment variables while configuring and building gccgo may fix the
problem.
</p>
<pre>
LIBRARY_PATH=/usr/lib/x86_64-linux-gnu
C_INCLUDE_PATH=/usr/include/x86_64-linux-gnu
CPLUS_INCLUDE_PATH=/usr/include/x86_64-linux-gnu
export LIBRARY_PATH C_INCLUDE_PATH CPLUS_INCLUDE_PATH
</pre>
<h2 id="Using_gccgo">Using gccgo</h2>
<p>
@ -364,12 +360,15 @@ or with C++ code compiled using <code>extern "C"</code>.
<h3 id="Types">Types</h3>
<p>
Basic types map directly: an <code>int</code> in Go is an <code>int</code>
in C, an <code>int32</code> is an <code>int32_t</code>,
etc. Go <code>byte</code> is equivalent to C <code>unsigned
char</code>.
Pointers in Go are pointers in C. A Go <code>struct</code> is the same as C
<code>struct</code> with the same fields and types.
Basic types map directly: an <code>int32</code> in Go is
an <code>int32_t</code> in C, an <code>int64</code> is
an <code>int64_t</code>, etc.
The Go type <code>int</code> is an integer that is the same size as a
pointer, and as such corresponds to the C type <code>intptr_t</code>.
Go <code>byte</code> is equivalent to C <code>unsigned char</code>.
Pointers in Go are pointers in C.
A Go <code>struct</code> is the same as C <code>struct</code> with the
same fields and types.
</p>
<p>
@ -380,7 +379,7 @@ structure (this is <b style="color: red;">subject to change</b>):
<pre>
struct __go_string {
const unsigned char *__data;
int __length;
intptr_t __length;
};
</pre>
@ -400,8 +399,8 @@ A slice in Go is a structure. The current definition is
<pre>
struct __go_slice {
void *__values;
int __count;
int __capacity;
intptr_t __count;
intptr_t __capacity;
};
</pre>
@ -526,15 +525,3 @@ This procedure is full of unstated caveats and restrictions and we make no
guarantee that it will not change in the future. It is more useful as a
starting point for real Go code than as a regular procedure.
</p>
<h2 id="RTEMS_Port">RTEMS Port</h2>
<p>
The gccgo compiler has been ported to <a href="http://www.rtems.com/">
<code>RTEMS</code></a>. <code>RTEMS</code> is a real-time executive
that provides a high performance environment for embedded applications
on a range of processors and embedded hardware. The current gccgo
port is for x86. The goal is to extend the port to most of the
<a href="http://www.rtems.org/wiki/index.php/SupportedCPUs">
architectures supported by <code>RTEMS</code></a>. For more information on the port,
as well as instructions on how to install it, please see this
<a href="http://www.rtems.org/wiki/index.php/GCCGoRTEMS"><code>RTEMS</code> Wiki page</a>.

19
doc/go1.8.html
View File

@ -435,11 +435,11 @@ version of gccgo.
<h3 id="plugin">Plugins</h3>
<p>
Go now supports a “<code>plugin</code>” build mode for generating
plugins written in Go, and a
Go now provides early support for plugins with a “<code>plugin</code>”
build mode for generating plugins written in Go, and a
new <a href="/pkg/plugin/"><code>plugin</code></a> package for
loading such plugins at run time. Plugin support is only currently
available on Linux.
loading such plugins at run time. Plugin support is currently only
available on Linux. Please report any issues.
</p>
<h2 id="runtime">Runtime</h2>
@ -1645,6 +1645,17 @@ crypto/x509: return error for missing SerialNumber (CL 27238)
and only the overall execution of the test binary would fail.
</p>
<p><!-- CL 32455 -->
The signature of the
<a href="/pkg/testing/#MainStart"><code>MainStart</code></a>
function has changed, as allowed by the documentation. It is an
internal detail and not part of the Go 1 compatibility promise.
If you're not calling <code>MainStart</code> directly but see
errors, that likely means you set the
normally-empty <code>GOROOT</code> environment variable and it
doesn't match the version of your <code>go</code> command's binary.
</p>
</dd>
</dl>

3
doc/install-source.html
View File

@ -147,6 +147,9 @@ either the git branch <code>release-branch.go1.4</code> or
which contains the Go 1.4 source code plus accumulated fixes
to keep the tools running on newer operating systems.
(Go 1.4 was the last distribution in which the tool chain was written in C.)
After unpacking the Go 1.4 source, <code>cd</code> to
the <code>src</code> subdirectory and run <code>make.bash</code> (or,
on Windows, <code>make.bat</code>).
</p>
<p>

2
misc/cgo/test/issue18146.go
View File

@ -73,7 +73,7 @@ func test18146(t *testing.T) {
}
runtime.GOMAXPROCS(threads)
argv := append(os.Args, "-test.run=NoSuchTestExists")
if err := syscall.Exec(os.Args[0], argv, nil); err != nil {
if err := syscall.Exec(os.Args[0], argv, os.Environ()); err != nil {
t.Fatal(err)
}
}

6
misc/cgo/test/sigaltstack.go
View File

@ -17,7 +17,7 @@ package cgotest
static stack_t oss;
static char signalStack[SIGSTKSZ];
static void changeSignalStack() {
static void changeSignalStack(void) {
stack_t ss;
memset(&ss, 0, sizeof ss);
ss.ss_sp = signalStack;
@ -29,7 +29,7 @@ static void changeSignalStack() {
}
}
static void restoreSignalStack() {
static void restoreSignalStack(void) {
#if (defined(__x86_64__) || defined(__i386__)) && defined(__APPLE__)
// The Darwin C library enforces a minimum that the kernel does not.
// This is OK since we allocated this much space in mpreinit,
@ -42,7 +42,7 @@ static void restoreSignalStack() {
}
}
static int zero() {
static int zero(void) {
return 0;
}
*/

12
misc/cgo/testsanitizers/msan_shared.go Normal file
View File

@ -0,0 +1,12 @@
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This program segfaulted during libpreinit when built with -msan:
// http://golang.org/issue/18707
package main
import "C"
func main() {}

21
misc/cgo/testsanitizers/test.bash
View File

@ -68,6 +68,25 @@ fi
status=0
testmsanshared() {
goos=$(go env GOOS)
suffix="-installsuffix testsanitizers"
libext="so"
if [ "$goos" == "darwin" ]; then
libext="dylib"
fi
go build -msan -buildmode=c-shared $suffix -o ${TMPDIR}/libmsanshared.$libext msan_shared.go
echo 'int main() { return 0; }' > ${TMPDIR}/testmsanshared.c
$CC $(go env GOGCCFLAGS) -fsanitize=memory -o ${TMPDIR}/testmsanshared ${TMPDIR}/testmsanshared.c ${TMPDIR}/libmsanshared.$libext
if ! LD_LIBRARY_PATH=. ${TMPDIR}/testmsanshared; then
echo "FAIL: msan_shared"
status=1
fi
rm -f ${TMPDIR}/{testmsanshared,testmsanshared.c,libmsanshared.$libext}
}
if test "$msan" = "yes"; then
if ! go build -msan std; then
echo "FAIL: build -msan std"
@ -108,6 +127,8 @@ if test "$msan" = "yes"; then
echo "FAIL: msan_fail"
status=1
fi
testmsanshared
fi
if test "$tsan" = "yes"; then

2
misc/cgo/testshared/src/depBase/dep.go
View File

@ -5,6 +5,8 @@ import (
"reflect"
)
var SlicePtr interface{} = &[]int{}
var V int = 1
var HasMask []string = []string{"hi"}

9
misc/cgo/testshared/src/exe/exe.go
View File

@ -19,6 +19,8 @@ func F() *C {
return nil
}
var slicePtr interface{} = &[]int{}
func main() {
defer depBase.ImplementedInAsm()
// This code below causes various go.itab.* symbols to be generated in
@ -32,4 +34,11 @@ func main() {
if reflect.TypeOf(F).Out(0) != reflect.TypeOf(c) {
panic("bad reflection results, see golang.org/issue/18252")
}
sp := reflect.New(reflect.TypeOf(slicePtr).Elem())
s := sp.Interface()
if reflect.TypeOf(s) != reflect.TypeOf(slicePtr) {
panic("bad reflection results, see golang.org/issue/18729")
}
}

9
src/cmd/compile/internal/gc/util.go
View File

@ -57,8 +57,13 @@ func startProfile() {
Fatalf("%v", err)
}
atExit(func() {
runtime.GC() // profile all outstanding allocations
if err := pprof.WriteHeapProfile(f); err != nil {
// Profile all outstanding allocations.
runtime.GC()
// compilebench parses the memory profile to extract memstats,
// which are only written in the legacy pprof format.
// See golang.org/issue/18641 and runtime/pprof/pprof.go:writeHeap.
const writeLegacyFormat = 1
if err := pprof.Lookup("heap").WriteTo(f, writeLegacyFormat); err != nil {
Fatalf("%v", err)
}
})

6
src/cmd/compile/internal/ssa/gen/S390X.rules
View File

@ -885,9 +885,9 @@
(MOVDEQ y _ (FlagLT)) -> y
(MOVDEQ y _ (FlagGT)) -> y
(MOVDNE _ y (FlagEQ)) -> y
(MOVDNE x _ (FlagLT)) -> x
(MOVDNE x _ (FlagGT)) -> x
(MOVDNE y _ (FlagEQ)) -> y
(MOVDNE _ x (FlagLT)) -> x
(MOVDNE _ x (FlagGT)) -> x
(MOVDLT y _ (FlagEQ)) -> y
(MOVDLT _ x (FlagLT)) -> x

22
src/cmd/compile/internal/ssa/nilcheck.go
View File

@ -82,7 +82,7 @@ func nilcheckelim(f *Func) {
}
}
// Next, process values in the block.
// Next, eliminate any redundant nil checks in this block.
i := 0
for _, v := range b.Values {
b.Values[i] = v
@ -105,13 +105,10 @@ func nilcheckelim(f *Func) {
f.Config.Warnl(v.Line, "removed nil check")
}
v.reset(OpUnknown)
// TODO: f.freeValue(v)
i--
continue
}
// Record the fact that we know ptr is non nil, and remember to
// undo that information when this dominator subtree is done.
nonNilValues[ptr.ID] = true
work = append(work, bp{op: ClearPtr, ptr: ptr})
}
}
for j := i; j < len(b.Values); j++ {
@ -119,6 +116,21 @@ func nilcheckelim(f *Func) {
}
b.Values = b.Values[:i]
// Finally, find redundant nil checks for subsequent blocks.
// Note that we can't add these until the loop above is done, as the
// values in the block are not ordered in any way when this pass runs.
// This was the cause of issue #18725.
for _, v := range b.Values {
if v.Op != OpNilCheck {
continue
}
ptr := v.Args[0]
// Record the fact that we know ptr is non nil, and remember to
// undo that information when this dominator subtree is done.
nonNilValues[ptr.ID] = true
work = append(work, bp{op: ClearPtr, ptr: ptr})
}
// Add all dominated blocks to the work list.
for w := sdom[node.block.ID].child; w != nil; w = sdom[w.ID].sibling {
work = append(work, bp{op: Work, block: w})

12
src/cmd/compile/internal/ssa/rewriteS390X.go
View File

@ -9847,11 +9847,11 @@ func rewriteValueS390X_OpS390XMOVDNE(v *Value, config *Config) bool {
v.AddArg(cmp)
return true
}
// match: (MOVDNE _ y (FlagEQ))
// match: (MOVDNE y _ (FlagEQ))
// cond:
// result: y
for {
y := v.Args[1]
y := v.Args[0]
v_2 := v.Args[2]
if v_2.Op != OpS390XFlagEQ {
break
@ -9861,11 +9861,11 @@ func rewriteValueS390X_OpS390XMOVDNE(v *Value, config *Config) bool {
v.AddArg(y)
return true
}
// match: (MOVDNE x _ (FlagLT))
// match: (MOVDNE _ x (FlagLT))
// cond:
// result: x
for {
x := v.Args[0]
x := v.Args[1]
v_2 := v.Args[2]
if v_2.Op != OpS390XFlagLT {
break
@ -9875,11 +9875,11 @@ func rewriteValueS390X_OpS390XMOVDNE(v *Value, config *Config) bool {
v.AddArg(x)
return true
}
// match: (MOVDNE x _ (FlagGT))
// match: (MOVDNE _ x (FlagGT))
// cond:
// result: x
for {
x := v.Args[0]
x := v.Args[1]
v_2 := v.Args[2]
if v_2.Op != OpS390XFlagGT {
break

23
src/cmd/go/go_test.go
View File

@ -3787,3 +3787,26 @@ GLOBL ·constants<>(SB),8,$8
tg.setenv("GOPATH", tg.path("go"))
tg.run("build", "p")
}
// Issue 18778.
func TestDotDotDotOutsideGOPATH(t *testing.T) {
tg := testgo(t)
defer tg.cleanup()
tg.tempFile("pkgs/a.go", `package x`)
tg.tempFile("pkgs/a_test.go", `package x_test
import "testing"
func TestX(t *testing.T) {}`)
tg.tempFile("pkgs/a/a.go", `package a`)
tg.tempFile("pkgs/a/a_test.go", `package a_test
import "testing"
func TestA(t *testing.T) {}`)
tg.cd(tg.path("pkgs"))
tg.run("build", "./...")
tg.run("test", "./...")
tg.run("list", "./...")
tg.grepStdout("pkgs$", "expected package not listed")
tg.grepStdout("pkgs/a", "expected package not listed")
}

2
src/cmd/go/pkg.go
View File

@ -429,7 +429,7 @@ func setErrorPos(p *Package, importPos []token.Position) *Package {
func cleanImport(path string) string {
orig := path
path = pathpkg.Clean(path)
if strings.HasPrefix(orig, "./") && path != ".." && path != "." && !strings.HasPrefix(path, "../") {
if strings.HasPrefix(orig, "./") && path != ".." && !strings.HasPrefix(path, "../") {
path = "./" + path
}
return path

2
src/cmd/link/internal/ld/dwarf.go
View File

@ -1080,7 +1080,7 @@ func writelines(ctxt *Link, syms []*Symbol) ([]*Symbol, []*Symbol) {
epcs = s
dsym := ctxt.Syms.Lookup(dwarf.InfoPrefix+s.Name, int(s.Version))
dsym.Attr |= AttrHidden
dsym.Attr |= AttrHidden | AttrReachable
dsym.Type = obj.SDWARFINFO
for _, r := range dsym.R {
if r.Type == obj.R_DWARFREF && r.Sym.Size == 0 {

91
src/database/sql/sql.go
View File

@ -1357,16 +1357,7 @@ func (db *DB) begin(ctx context.Context, opts *TxOptions, strategy connReuseStra
cancel: cancel,
ctx: ctx,
}
go func(tx *Tx) {
select {
case <-tx.ctx.Done():
if !tx.isDone() {
// Discard and close the connection used to ensure the transaction
// is closed and the resources are released.
tx.rollback(true)
}
}
}(tx)
go tx.awaitDone()
return tx, nil
}
@ -1388,6 +1379,11 @@ func (db *DB) Driver() driver.Driver {
type Tx struct {
db *DB
// closemu prevents the transaction from closing while there
// is an active query. It is held for read during queries
// and exclusively during close.
closemu sync.RWMutex
// dc is owned exclusively until Commit or Rollback, at which point
// it's returned with putConn.
dc *driverConn
@ -1413,6 +1409,20 @@ type Tx struct {
ctx context.Context
}
// awaitDone blocks until the context in Tx is canceled and rolls back
// the transaction if it's not already done.
func (tx *Tx) awaitDone() {
// Wait for either the transaction to be committed or rolled
// back, or for the associated context to be closed.
<-tx.ctx.Done()
// Discard and close the connection used to ensure the
// transaction is closed and the resources are released. This
// rollback does nothing if the transaction has already been
// committed or rolled back.
tx.rollback(true)
}
func (tx *Tx) isDone() bool {
return atomic.LoadInt32(&tx.done) != 0
}
@ -1424,16 +1434,31 @@ var ErrTxDone = errors.New("sql: Transaction has already been committed or rolle
// close returns the connection to the pool and
// must only be called by Tx.rollback or Tx.Commit.
func (tx *Tx) close(err error) {
tx.closemu.Lock()
defer tx.closemu.Unlock()
tx.db.putConn(tx.dc, err)
tx.cancel()
tx.dc = nil
tx.txi = nil
}
// hookTxGrabConn specifies an optional hook to be called on
// a successful call to (*Tx).grabConn. For tests.
var hookTxGrabConn func()
func (tx *Tx) grabConn(ctx context.Context) (*driverConn, error) {
select {
default:
case <-ctx.Done():
return nil, ctx.Err()
}
if tx.isDone() {
return nil, ErrTxDone
}
if hookTxGrabConn != nil { // test hook
hookTxGrabConn()
}
return tx.dc, nil
}
@ -1503,6 +1528,9 @@ func (tx *Tx) Rollback() error {
// for the execution of the returned statement. The returned statement
// will run in the transaction context.
func (tx *Tx) PrepareContext(ctx context.Context, query string) (*Stmt, error) {
tx.closemu.RLock()
defer tx.closemu.RUnlock()
// TODO(bradfitz): We could be more efficient here and either
// provide a method to take an existing Stmt (created on
// perhaps a different Conn), and re-create it on this Conn if
@ -1567,6 +1595,9 @@ func (tx *Tx) Prepare(query string) (*Stmt, error) {
// The returned statement operates within the transaction and will be closed
// when the transaction has been committed or rolled back.
func (tx *Tx) StmtContext(ctx context.Context, stmt *Stmt) *Stmt {
tx.closemu.RLock()
defer tx.closemu.RUnlock()
// TODO(bradfitz): optimize this. Currently this re-prepares
// each time. This is fine for now to illustrate the API but
// we should really cache already-prepared statements
@ -1618,6 +1649,9 @@ func (tx *Tx) Stmt(stmt *Stmt) *Stmt {
// ExecContext executes a query that doesn't return rows.
// For example: an INSERT and UPDATE.
func (tx *Tx) ExecContext(ctx context.Context, query string, args ...interface{}) (Result, error) {
tx.closemu.RLock()
defer tx.closemu.RUnlock()
dc, err := tx.grabConn(ctx)
if err != nil {
return nil, err
@ -1661,6 +1695,9 @@ func (tx *Tx) Exec(query string, args ...interface{}) (Result, error) {
// QueryContext executes a query that returns rows, typically a SELECT.
func (tx *Tx) QueryContext(ctx context.Context, query string, args ...interface{}) (*Rows, error) {
tx.closemu.RLock()
defer tx.closemu.RUnlock()
dc, err := tx.grabConn(ctx)
if err != nil {
return nil, err
@ -2038,25 +2075,21 @@ type Rows struct {
// closed value is 1 when the Rows is closed.
// Use atomic operations on value when checking value.
closed int32
ctxClose chan struct{} // closed when Rows is closed, may be null.
cancel func() // called when Rows is closed, may be nil.
lastcols []driver.Value
lasterr error // non-nil only if closed is true
closeStmt *driverStmt // if non-nil, statement to Close on close
}
func (rs *Rows) initContextClose(ctx context.Context) {
if ctx.Done() == context.Background().Done() {
return
}
ctx, rs.cancel = context.WithCancel(ctx)
go rs.awaitDone(ctx)
}
rs.ctxClose = make(chan struct{})
go func() {
select {
case <-ctx.Done():
rs.Close()
case <-rs.ctxClose:
}
}()
// awaitDone blocks until the rows are closed or the context canceled.
func (rs *Rows) awaitDone(ctx context.Context) {
<-ctx.Done()
rs.Close()
}
// Next prepares the next result row for reading with the Scan method. It
@ -2314,7 +2347,9 @@ func (rs *Rows) Scan(dest ...interface{}) error {
return nil
}
var rowsCloseHook func(*Rows, *error)
// rowsCloseHook returns a function so tests may install the
// hook throug a test only mutex.
var rowsCloseHook = func() func(*Rows, *error) { return nil }
func (rs *Rows) isClosed() bool {
return atomic.LoadInt32(&rs.closed) != 0
@ -2328,13 +2363,15 @@ func (rs *Rows) Close() error {
if !atomic.CompareAndSwapInt32(&rs.closed, 0, 1) {
return nil
}
if rs.ctxClose != nil {
close(rs.ctxClose)
}
err := rs.rowsi.Close()
if fn := rowsCloseHook; fn != nil {
if fn := rowsCloseHook(); fn != nil {
fn(rs, &err)
}
if rs.cancel != nil {
rs.cancel()
}
if rs.closeStmt != nil {
rs.closeStmt.Close()
}

123
src/database/sql/sql_test.go
View File

@ -14,6 +14,7 @@ import (
"runtime"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
)
@ -326,9 +327,7 @@ func TestQueryContext(t *testing.T) {
// And verify that the final rows.Next() call, which hit EOF,
// also closed the rows connection.
if n := db.numFreeConns(); n != 1 {
t.Fatalf("free conns after query hitting EOF = %d; want 1", n)
}
waitForFree(t, db, 5*time.Second, 1)
if prepares := numPrepares(t, db) - prepares0; prepares != 1 {
t.Errorf("executed %d Prepare statements; want 1", prepares)
}
@ -345,6 +344,18 @@ func waitCondition(waitFor, checkEvery time.Duration, fn func() bool) bool {
return false
}
// waitForFree checks db.numFreeConns until either it equals want or
// the maxWait time elapses.
func waitForFree(t *testing.T, db *DB, maxWait time.Duration, want int) {
var numFree int
if !waitCondition(maxWait, 5*time.Millisecond, func() bool {
numFree = db.numFreeConns()
return numFree == want
}) {
t.Fatalf("free conns after hitting EOF = %d; want %d", numFree, want)
}
}
func TestQueryContextWait(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
@ -361,9 +372,7 @@ func TestQueryContextWait(t *testing.T) {
}
// Verify closed rows connection after error condition.
if n := db.numFreeConns(); n != 1 {
t.Fatalf("free conns after query hitting EOF = %d; want 1", n)
}
waitForFree(t, db, 5*time.Second, 1)
if prepares := numPrepares(t, db) - prepares0; prepares != 1 {
t.Errorf("executed %d Prepare statements; want 1", prepares)
}
@ -388,13 +397,7 @@ func TestTxContextWait(t *testing.T) {
t.Fatalf("expected QueryContext to error with context deadline exceeded but returned %v", err)
}
var numFree int
if !waitCondition(5*time.Second, 5*time.Millisecond, func() bool {
numFree = db.numFreeConns()
return numFree == 0
}) {
t.Fatalf("free conns after hitting EOF = %d; want 0", numFree)
}
waitForFree(t, db, 5*time.Second, 0)
// Ensure the dropped connection allows more connections to be made.
// Checked on DB Close.
@ -471,9 +474,7 @@ func TestMultiResultSetQuery(t *testing.T) {
// And verify that the final rows.Next() call, which hit EOF,
// also closed the rows connection.
if n := db.numFreeConns(); n != 1 {
t.Fatalf("free conns after query hitting EOF = %d; want 1", n)
}
waitForFree(t, db, 5*time.Second, 1)
if prepares := numPrepares(t, db) - prepares0; prepares != 1 {
t.Errorf("executed %d Prepare statements; want 1", prepares)
}
@ -1135,6 +1136,24 @@ func TestQueryRowClosingStmt(t *testing.T) {
}
}
var atomicRowsCloseHook atomic.Value // of func(*Rows, *error)
func init() {
rowsCloseHook = func() func(*Rows, *error) {
fn, _ := atomicRowsCloseHook.Load().(func(*Rows, *error))
return fn
}
}
func setRowsCloseHook(fn func(*Rows, *error)) {
if fn == nil {
// Can't change an atomic.Value back to nil, so set it to this
// no-op func instead.
fn = func(*Rows, *error) {}
}
atomicRowsCloseHook.Store(fn)
}
// Test issue 6651
func TestIssue6651(t *testing.T) {
db := newTestDB(t, "people")
@ -1147,6 +1166,7 @@ func TestIssue6651(t *testing.T) {
return fmt.Errorf(want)
}
defer func() { rowsCursorNextHook = nil }()
err := db.QueryRow("SELECT|people|name|").Scan(&v)
if err == nil || err.Error() != want {
t.Errorf("error = %q; want %q", err, want)
@ -1154,10 +1174,10 @@ func TestIssue6651(t *testing.T) {
rowsCursorNextHook = nil
want = "error in rows.Close"
rowsCloseHook = func(rows *Rows, err *error) {
setRowsCloseHook(func(rows *Rows, err *error) {
*err = fmt.Errorf(want)
}
defer func() { rowsCloseHook = nil }()
})
defer setRowsCloseHook(nil)
err = db.QueryRow("SELECT|people|name|").Scan(&v)
if err == nil || err.Error() != want {
t.Errorf("error = %q; want %q", err, want)
@ -1830,7 +1850,9 @@ func TestStmtCloseDeps(t *testing.T) {
db.dumpDeps(t)
}
if len(stmt.css) > nquery {
if !waitCondition(5*time.Second, 5*time.Millisecond, func() bool {
return len(stmt.css) <= nquery
}) {
t.Errorf("len(stmt.css) = %d; want <= %d", len(stmt.css), nquery)
}
@ -2576,10 +2598,10 @@ func TestIssue6081(t *testing.T) {
if err != nil {
t.Fatal(err)
}
rowsCloseHook = func(rows *Rows, err *error) {
setRowsCloseHook(func(rows *Rows, err *error) {
*err = driver.ErrBadConn
}
defer func() { rowsCloseHook = nil }()
})
defer setRowsCloseHook(nil)
for i := 0; i < 10; i++ {
rows, err := stmt.Query()
if err != nil {
@ -2642,7 +2664,10 @@ func TestIssue18429(t *testing.T) {
if err != nil {
return
}
rows, err := tx.QueryContext(ctx, "WAIT|"+qwait+"|SELECT|people|name|")
// This is expected to give a cancel error many, but not all the time.
// Test failure will happen with a panic or other race condition being
// reported.
rows, _ := tx.QueryContext(ctx, "WAIT|"+qwait+"|SELECT|people|name|")
if rows != nil {
rows.Close()
}
@ -2655,6 +2680,56 @@ func TestIssue18429(t *testing.T) {
time.Sleep(milliWait * 3 * time.Millisecond)
}
// TestIssue18719 closes the context right before use. The sql.driverConn
// will nil out the ci on close in a lock, but if another process uses it right after
// it will panic with on the nil ref.
//
// See https://golang.org/cl/35550 .
func TestIssue18719(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
tx, err := db.BeginTx(ctx, nil)
if err != nil {
t.Fatal(err)
}
hookTxGrabConn = func() {
cancel()
// Wait for the context to cancel and tx to rollback.
for tx.isDone() == false {
time.Sleep(time.Millisecond * 3)
}
}
defer func() { hookTxGrabConn = nil }()
// This call will grab the connection and cancel the context
// after it has done so. Code after must deal with the canceled state.
rows, err := tx.QueryContext(ctx, "SELECT|people|name|")
if err != nil {
rows.Close()
t.Fatalf("expected error %v but got %v", nil, err)
}
// Rows may be ignored because it will be closed when the context is canceled.
// Do not explicitly rollback. The rollback will happen from the
// canceled context.
// Wait for connections to return to pool.
var numOpen int
if !waitCondition(5*time.Second, 5*time.Millisecond, func() bool {
numOpen = db.numOpenConns()
return numOpen == 0
}) {
t.Fatalf("open conns after hitting EOF = %d; want 0", numOpen)
}
}
func TestConcurrency(t *testing.T) {
doConcurrentTest(t, new(concurrentDBQueryTest))
doConcurrentTest(t, new(concurrentDBExecTest))

17
src/go/printer/nodes.go
View File

@ -733,7 +733,7 @@ func (p *printer) expr1(expr ast.Expr, prec1, depth int) {
case *ast.FuncLit:
p.expr(x.Type)
p.adjBlock(p.distanceFrom(x.Type.Pos()), blank, x.Body)
p.funcBody(p.distanceFrom(x.Type.Pos()), blank, x.Body)
case *ast.ParenExpr:
if _, hasParens := x.X.(*ast.ParenExpr); hasParens {
@ -825,6 +825,7 @@ func (p *printer) expr1(expr ast.Expr, prec1, depth int) {
if x.Type != nil {
p.expr1(x.Type, token.HighestPrec, depth)
}
p.level++
p.print(x.Lbrace, token.LBRACE)
p.exprList(x.Lbrace, x.Elts, 1, commaTerm, x.Rbrace)
// do not insert extra line break following a /*-style comment
@ -837,6 +838,7 @@ func (p *printer) expr1(expr ast.Expr, prec1, depth int) {
mode |= noExtraBlank
}
p.print(mode, x.Rbrace, token.RBRACE, mode)
p.level--
case *ast.Ellipsis:
p.print(token.ELLIPSIS)
@ -1557,18 +1559,23 @@ func (p *printer) bodySize(b *ast.BlockStmt, maxSize int) int {
return bodySize
}
// adjBlock prints an "adjacent" block (e.g., a for-loop or function body) following
// a header (e.g., a for-loop control clause or function signature) of given headerSize.
// funcBody prints a function body following a function header of given headerSize.
// If the header's and block's size are "small enough" and the block is "simple enough",
// the block is printed on the current line, without line breaks, spaced from the header
// by sep. Otherwise the block's opening "{" is printed on the current line, followed by
// lines for the block's statements and its closing "}".
//
func (p *printer) adjBlock(headerSize int, sep whiteSpace, b *ast.BlockStmt) {
func (p *printer) funcBody(headerSize int, sep whiteSpace, b *ast.BlockStmt) {
if b == nil {
return
}
// save/restore composite literal nesting level
defer func(level int) {
p.level = level
}(p.level)
p.level = 0
const maxSize = 100
if headerSize+p.bodySize(b, maxSize) <= maxSize {
p.print(sep, b.Lbrace, token.LBRACE)
@ -1613,7 +1620,7 @@ func (p *printer) funcDecl(d *ast.FuncDecl) {
}
p.expr(d.Name)
p.signature(d.Type.Params, d.Type.Results)
p.adjBlock(p.distanceFrom(d.Pos()), vtab, d.Body)
p.funcBody(p.distanceFrom(d.Pos()), vtab, d.Body)
}
func (p *printer) decl(decl ast.Decl) {

11
src/go/printer/printer.go
View File

@ -58,6 +58,7 @@ type printer struct {
// Current state
output []byte // raw printer result
indent int // current indentation
level int // level == 0: outside composite literal; level > 0: inside composite literal
mode pmode // current printer mode
impliedSemi bool // if set, a linebreak implies a semicolon
lastTok token.Token // last token printed (token.ILLEGAL if it's whitespace)
@ -744,15 +745,19 @@ func (p *printer) intersperseComments(next token.Position, tok token.Token) (wro
// follows on the same line but is not a comma, and not a "closing"
// token immediately following its corresponding "opening" token,
// add an extra separator unless explicitly disabled. Use a blank
// as separator unless we have pending linebreaks and they are not
// disabled, in which case we want a linebreak (issue 15137).
// as separator unless we have pending linebreaks, they are not
// disabled, and we are outside a composite literal, in which case
// we want a linebreak (issue 15137).
// TODO(gri) This has become overly complicated. We should be able
// to track whether we're inside an expression or statement and
// use that information to decide more directly.
needsLinebreak := false
if p.mode&noExtraBlank == 0 &&
last.Text[1] == '*' && p.lineFor(last.Pos()) == next.Line &&
tok != token.COMMA &&
(tok != token.RPAREN || p.prevOpen == token.LPAREN) &&
(tok != token.RBRACK || p.prevOpen == token.LBRACK) {
if p.containsLinebreak() && p.mode&noExtraLinebreak == 0 {
if p.containsLinebreak() && p.mode&noExtraLinebreak == 0 && p.level == 0 {
needsLinebreak = true
} else {
p.writeByte(' ', 1)

59
src/go/printer/testdata/comments2.golden vendored
View File

@ -103,3 +103,62 @@ label:
mask := uint64(1)<<c - 1 // Allocation mask
used := atomic.LoadUint64(&h.used) // Current allocations
}
// Test cases for issue 18782
var _ = [][]int{
/* a, b, c, d, e */
/* a */ {0, 0, 0, 0, 0},
/* b */ {0, 5, 4, 4, 4},
/* c */ {0, 4, 5, 4, 4},
/* d */ {0, 4, 4, 5, 4},
/* e */ {0, 4, 4, 4, 5},
}
var _ = T{ /* a */ 0}
var _ = T{ /* a */ /* b */ 0}
var _ = T{ /* a */ /* b */
/* c */ 0,
}
var _ = T{ /* a */ /* b */
/* c */
/* d */ 0,
}
var _ = T{
/* a */
/* b */ 0,
}
var _ = T{ /* a */ {}}
var _ = T{ /* a */ /* b */ {}}
var _ = T{ /* a */ /* b */
/* c */ {},
}
var _ = T{ /* a */ /* b */
/* c */
/* d */ {},
}
var _ = T{
/* a */
/* b */ {},
}
var _ = []T{
func() {
var _ = [][]int{
/* a, b, c, d, e */
/* a */ {0, 0, 0, 0, 0},
/* b */ {0, 5, 4, 4, 4},
/* c */ {0, 4, 5, 4, 4},
/* d */ {0, 4, 4, 5, 4},
/* e */ {0, 4, 4, 4, 5},
}
},
}

63
src/go/printer/testdata/comments2.input vendored
View File

@ -103,3 +103,66 @@ label:
mask := uint64(1)<<c - 1 // Allocation mask
used := atomic.LoadUint64(&h.used) // Current allocations
}
// Test cases for issue 18782
var _ = [][]int{
/* a, b, c, d, e */
/* a */ {0, 0, 0, 0, 0},
/* b */ {0, 5, 4, 4, 4},
/* c */ {0, 4, 5, 4, 4},
/* d */ {0, 4, 4, 5, 4},
/* e */ {0, 4, 4, 4, 5},
}
var _ = T{ /* a */ 0,
}
var _ = T{ /* a */ /* b */ 0,
}
var _ = T{ /* a */ /* b */
/* c */ 0,
}
var _ = T{ /* a */ /* b */
/* c */
/* d */ 0,
}
var _ = T{
/* a */
/* b */ 0,
}
var _ = T{ /* a */ {},
}
var _ = T{ /* a */ /* b */ {},
}
var _ = T{ /* a */ /* b */
/* c */ {},
}
var _ = T{ /* a */ /* b */
/* c */
/* d */ {},
}
var _ = T{
/* a */
/* b */ {},
}
var _ = []T{
func() {
var _ = [][]int{
/* a, b, c, d, e */
/* a */ {0, 0, 0, 0, 0},
/* b */ {0, 5, 4, 4, 4},
/* c */ {0, 4, 5, 4, 4},
/* d */ {0, 4, 4, 5, 4},
/* e */ {0, 4, 4, 4, 5},
}
},
}

21
src/net/http/client.go
View File

@ -413,11 +413,12 @@ func (c *Client) checkRedirect(req *Request, via []*Request) error {
// redirectBehavior describes what should happen when the
// client encounters a 3xx status code from the server
func redirectBehavior(reqMethod string, resp *Response, ireq *Request) (redirectMethod string, shouldRedirect bool) {
func redirectBehavior(reqMethod string, resp *Response, ireq *Request) (redirectMethod string, shouldRedirect, includeBody bool) {
switch resp.StatusCode {
case 301, 302, 303:
redirectMethod = reqMethod
shouldRedirect = true
includeBody = false
// RFC 2616 allowed automatic redirection only with GET and
// HEAD requests. RFC 7231 lifts this restriction, but we still
@ -429,6 +430,7 @@ func redirectBehavior(reqMethod string, resp *Response, ireq *Request) (redirect
case 307, 308:
redirectMethod = reqMethod
shouldRedirect = true
includeBody = true
// Treat 307 and 308 specially, since they're new in
// Go 1.8, and they also require re-sending the request body.
@ -449,7 +451,7 @@ func redirectBehavior(reqMethod string, resp *Response, ireq *Request) (redirect
shouldRedirect = false
}
}
return redirectMethod, shouldRedirect
return redirectMethod, shouldRedirect, includeBody
}
// Do sends an HTTP request and returns an HTTP response, following
@ -492,11 +494,14 @@ func (c *Client) Do(req *Request) (*Response, error) {
}
var (
deadline = c.deadline()
reqs []*Request
resp *Response
copyHeaders = c.makeHeadersCopier(req)
deadline = c.deadline()
reqs []*Request
resp *Response
copyHeaders = c.makeHeadersCopier(req)
// Redirect behavior:
redirectMethod string
includeBody bool
)
uerr := func(err error) error {
req.closeBody()
@ -534,7 +539,7 @@ func (c *Client) Do(req *Request) (*Response, error) {
Cancel: ireq.Cancel,
ctx: ireq.ctx,
}
if ireq.GetBody != nil {
if includeBody && ireq.GetBody != nil {
req.Body, err = ireq.GetBody()
if err != nil {
return nil, uerr(err)
@ -598,7 +603,7 @@ func (c *Client) Do(req *Request) (*Response, error) {
}
var shouldRedirect bool
redirectMethod, shouldRedirect = redirectBehavior(req.Method, resp, reqs[0])
redirectMethod, shouldRedirect, includeBody = redirectBehavior(req.Method, resp, reqs[0])
if !shouldRedirect {
return resp, nil
}

61
src/net/http/client_test.go
View File

@ -360,25 +360,25 @@ func TestPostRedirects(t *testing.T) {
wantSegments := []string{
`POST / "first"`,
`POST /?code=301&next=302 "c301"`,
`GET /?code=302 "c301"`,
`GET / "c301"`,
`GET /?code=302 ""`,
`GET / ""`,
`POST /?code=302&next=302 "c302"`,
`GET /?code=302 "c302"`,
`GET / "c302"`,
`GET /?code=302 ""`,
`GET / ""`,
`POST /?code=303&next=301 "c303wc301"`,
`GET /?code=301 "c303wc301"`,
`GET / "c303wc301"`,
`GET /?code=301 ""`,
`GET / ""`,
`POST /?code=304 "c304"`,
`POST /?code=305 "c305"`,
`POST /?code=307&next=303,308,302 "c307"`,
`POST /?code=303&next=308,302 "c307"`,
`GET /?code=308&next=302 "c307"`,
`GET /?code=308&next=302 ""`,
`GET /?code=302 "c307"`,
`GET / "c307"`,
`GET / ""`,
`POST /?code=308&next=302,301 "c308"`,
`POST /?code=302&next=301 "c308"`,
`GET /?code=301 "c308"`,
`GET / "c308"`,
`GET /?code=301 ""`,
`GET / ""`,
`POST /?code=404 "c404"`,
}
want := strings.Join(wantSegments, "\n")
@ -399,20 +399,20 @@ func TestDeleteRedirects(t *testing.T) {
wantSegments := []string{
`DELETE / "first"`,
`DELETE /?code=301&next=302,308 "c301"`,
`GET /?code=302&next=308 "c301"`,
`GET /?code=308 "c301"`,
`GET /?code=302&next=308 ""`,
`GET /?code=308 ""`,
`GET / "c301"`,
`DELETE /?code=302&next=302 "c302"`,
`GET /?code=302 "c302"`,
`GET / "c302"`,
`GET /?code=302 ""`,
`GET / ""`,
`DELETE /?code=303 "c303"`,
`GET / "c303"`,
`GET / ""`,
`DELETE /?code=307&next=301,308,303,302,304 "c307"`,
`DELETE /?code=301&next=308,303,302,304 "c307"`,
`GET /?code=308&next=303,302,304 "c307"`,
`GET /?code=308&next=303,302,304 ""`,
`GET /?code=303&next=302,304 "c307"`,
`GET /?code=302&next=304 "c307"`,
`GET /?code=304 "c307"`,
`GET /?code=302&next=304 ""`,
`GET /?code=304 ""`,
`DELETE /?code=308&next=307 "c308"`,
`DELETE /?code=307 "c308"`,
`DELETE / "c308"`,
@ -432,7 +432,11 @@ func testRedirectsByMethod(t *testing.T, method string, table []redirectTest, wa
ts = httptest.NewServer(HandlerFunc(func(w ResponseWriter, r *Request) {
log.Lock()
slurp, _ := ioutil.ReadAll(r.Body)
fmt.Fprintf(&log.Buffer, "%s %s %q\n", r.Method, r.RequestURI, slurp)
fmt.Fprintf(&log.Buffer, "%s %s %q", r.Method, r.RequestURI, slurp)
if cl := r.Header.Get("Content-Length"); r.Method == "GET" && len(slurp) == 0 && (r.ContentLength != 0 || cl != "") {
fmt.Fprintf(&log.Buffer, " (but with body=%T, content-length = %v, %q)", r.Body, r.ContentLength, cl)
}
log.WriteByte('\n')
log.Unlock()
urlQuery := r.URL.Query()
if v := urlQuery.Get("code"); v != "" {
@ -475,7 +479,24 @@ func testRedirectsByMethod(t *testing.T, method string, table []redirectTest, wa
want = strings.TrimSpace(want)
if got != want {
t.Errorf("Log differs.\n Got:\n%s\nWant:\n%s\n", got, want)
got, want, lines := removeCommonLines(got, want)
t.Errorf("Log differs after %d common lines.\n\nGot:\n%s\n\nWant:\n%s\n", lines, got, want)
}
}
func removeCommonLines(a, b string) (asuffix, bsuffix string, commonLines int) {
for {
nl := strings.IndexByte(a, '\n')
if nl < 0 {
return a, b, commonLines
}
line := a[:nl+1]
if !strings.HasPrefix(b, line) {
return a, b, commonLines
}
commonLines++
a = a[len(line):]
b = b[len(line):]
}
}

2
src/net/http/serve_test.go
View File

@ -5277,7 +5277,7 @@ func TestServerHijackGetsBackgroundByte_big(t *testing.T) {
defer conn.Close()
slurp, err := ioutil.ReadAll(buf.Reader)
if err != nil {
t.Error("Copy: %v", err)
t.Errorf("Copy: %v", err)
}
allX := true
for _, v := range slurp {

10
src/runtime/memmove_amd64.s
View File

@ -146,10 +146,16 @@ move_1or2:
move_0:
RET
move_3or4:
CMPQ BX, $4
JB move_3
MOVL (SI), AX
MOVL AX, (DI)
RET
move_3:
MOVW (SI), AX
MOVW -2(SI)(BX*1), CX
MOVB 2(SI), CX
MOVW AX, (DI)
MOVW CX, -2(DI)(BX*1)
MOVB CX, 2(DI)
RET
move_5through7:
MOVL (SI), AX

20
src/runtime/memmove_test.go
View File

@ -6,6 +6,7 @@ package runtime_test
import (
"crypto/rand"
"encoding/binary"
"fmt"
"internal/race"
. "runtime"
@ -447,3 +448,22 @@ func BenchmarkCopyFat1024(b *testing.B) {
_ = y
}
}
func BenchmarkIssue18740(b *testing.B) {
// This tests that memmove uses one 4-byte load/store to move 4 bytes.
// It used to do 2 2-byte load/stores, which leads to a pipeline stall
// when we try to read the result with one 4-byte load.
var buf [4]byte
for j := 0; j < b.N; j++ {
s := uint32(0)
for i := 0; i < 4096; i += 4 {
copy(buf[:], g[i:])
s += binary.LittleEndian.Uint32(buf[:])
}
sink = uint64(s)
}
}
// TODO: 2 byte and 8 byte benchmarks also.
var g [4096]byte

4
src/runtime/msan.go
View File

@ -28,9 +28,11 @@ const msanenabled = true
// the runtime, but operations like a slice copy can call msanread
// anyhow for values on the stack. Just ignore msanread when running
// on the system stack. The other msan functions are fine.
//
//go:nosplit
func msanread(addr unsafe.Pointer, sz uintptr) {
g := getg()
if g == g.m.g0 || g == g.m.gsignal {
if g == nil || g.m == nil || g == g.m.g0 || g == g.m.gsignal {
return
}
domsanread(addr, sz)

22
src/runtime/runtime-gdb_test.go
View File

@ -7,6 +7,7 @@ package runtime_test
import (
"bytes"
"fmt"
"go/build"
"internal/testenv"
"io/ioutil"
"os"
@ -67,7 +68,6 @@ func checkGdbPython(t *testing.T) {
}
const helloSource = `
package main
import "fmt"
var gslice []string
func main() {
@ -85,9 +85,20 @@ func main() {
`
func TestGdbPython(t *testing.T) {
testGdbPython(t, false)
}
func TestGdbPythonCgo(t *testing.T) {
testGdbPython(t, true)
}
func testGdbPython(t *testing.T, cgo bool) {
if runtime.GOARCH == "mips64" {
testenv.SkipFlaky(t, 18173)
}
if cgo && !build.Default.CgoEnabled {
t.Skip("skipping because cgo is not enabled")
}
t.Parallel()
checkGdbEnvironment(t)
@ -100,8 +111,15 @@ func TestGdbPython(t *testing.T) {
}
defer os.RemoveAll(dir)
var buf bytes.Buffer
buf.WriteString("package main\n")
if cgo {
buf.WriteString(`import "C"` + "\n")
}
buf.WriteString(helloSource)
src := filepath.Join(dir, "main.go")
err = ioutil.WriteFile(src, []byte(helloSource), 0644)
err = ioutil.WriteFile(src, buf.Bytes(), 0644)
if err != nil {
t.Fatalf("failed to create file: %v", err)
}

19
src/runtime/symtab.go
View File

@ -285,6 +285,25 @@ func modulesinit() {
md.gcbssmask = progToPointerMask((*byte)(unsafe.Pointer(md.gcbss)), md.ebss-md.bss)
}
}
// Modules appear in the moduledata linked list in the order they are
// loaded by the dynamic loader, with one exception: the
// firstmoduledata itself the module that contains the runtime. This
// is not always the first module (when using -buildmode=shared, it
// is typically libstd.so, the second module). The order matters for
// typelinksinit, so we swap the first module with whatever module
// contains the main function.
//
// See Issue #18729.
mainText := funcPC(main_main)
for i, md := range *modules {
if md.text <= mainText && mainText <= md.etext {
(*modules)[0] = md
(*modules)[i] = &firstmoduledata
break
}
}
atomicstorep(unsafe.Pointer(&modulesSlice), unsafe.Pointer(modules))
}

24
test/fixedbugs/issue18725.go Normal file
View File

@ -0,0 +1,24 @@
// run
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import "os"
func panicWhenNot(cond bool) {
if cond {
os.Exit(0)
} else {
panic("nilcheck elim failed")
}
}
func main() {
e := (*string)(nil)
panicWhenNot(e == e)
// Should never reach this line.
panicWhenNot(*e == *e)
}

36
test/nilptr3.go
View File

@ -40,23 +40,23 @@ var (
)
func f1() {
_ = *intp // ERROR "generated nil check"
_ = *intp // ERROR "removed nil check"
// This one should be removed but the block copy needs
// to be turned into its own pseudo-op in order to see
// the indirect.
_ = *arrayp // ERROR "generated nil check"
_ = *arrayp // ERROR "removed nil check"
// 0-byte indirect doesn't suffice.
// we don't registerize globals, so there are no removed.* nil checks.
_ = *array0p // ERROR "generated nil check"
_ = *array0p // ERROR "removed nil check"
_ = *array0p // ERROR "generated nil check"
_ = *intp // ERROR "removed nil check"
_ = *intp // ERROR "generated nil check"
_ = *arrayp // ERROR "removed nil check"
_ = *structp // ERROR "generated nil check"
_ = *emptyp // ERROR "generated nil check"
_ = *arrayp // ERROR "removed nil check"
_ = *arrayp // ERROR "generated nil check"
}
func f2() {
@ -71,15 +71,15 @@ func f2() {
empty1p *Empty1
)
_ = *intp // ERROR "generated nil check"
_ = *arrayp // ERROR "generated nil check"
_ = *array0p // ERROR "generated nil check"
_ = *array0p // ERROR "removed.* nil check"
_ = *intp // ERROR "removed.* nil check"
_ = *arrayp // ERROR "removed.* nil check"
_ = *array0p // ERROR "removed.* nil check"
_ = *array0p // ERROR "generated nil check"
_ = *intp // ERROR "generated nil check"
_ = *arrayp // ERROR "removed.* nil check"
_ = *structp // ERROR "generated nil check"
_ = *emptyp // ERROR "generated nil check"
_ = *arrayp // ERROR "removed.* nil check"
_ = *arrayp // ERROR "generated nil check"
_ = *bigarrayp // ERROR "generated nil check" ARM removed nil check before indirect!!
_ = *bigstructp // ERROR "generated nil check"
_ = *empty1p // ERROR "generated nil check"
@ -122,16 +122,16 @@ func f3(x *[10000]int) {
// x wasn't going to change across the function call.
// But it's a little complex to do and in practice doesn't
// matter enough.
_ = x[9999] // ERROR "removed nil check"
_ = x[9999] // ERROR "generated nil check" // TODO: fix
}
func f3a() {
x := fx10k()
y := fx10k()
z := fx10k()
_ = &x[9] // ERROR "generated nil check"
y = z
_ = &x[9] // ERROR "removed.* nil check"
y = z
_ = &x[9] // ERROR "generated nil check"
x = y
_ = &x[9] // ERROR "generated nil check"
}
@ -139,11 +139,11 @@ func f3a() {
func f3b() {
x := fx10k()
y := fx10k()
_ = &x[9] // ERROR "generated nil check"
_ = &x[9] // ERROR "removed.* nil check"
y = x
_ = &x[9] // ERROR "removed.* nil check"
x = y
_ = &x[9] // ERROR "removed.* nil check"
_ = &x[9] // ERROR "generated nil check"
}
func fx10() *[10]int
@ -179,15 +179,15 @@ func f4(x *[10]int) {
_ = x[9] // ERROR "generated nil check" // bug would like to remove before indirect
fx10()
_ = x[9] // ERROR "removed nil check"
_ = x[9] // ERROR "generated nil check" // TODO: fix
x = fx10()
y := fx10()
_ = &x[9] // ERROR "generated nil check"
_ = &x[9] // ERROR "removed[a-z ]* nil check"
y = x
_ = &x[9] // ERROR "removed[a-z ]* nil check"
x = y
_ = &x[9] // ERROR "removed[a-z ]* nil check"
_ = &x[9] // ERROR "generated nil check"
}
func f5(p *float32, q *float64, r *float32, s *float64) float64 {