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authorNiall Sheridan <nsheridan@gmail.com>2018-06-20 22:39:07 +0100
committerNiall Sheridan <nsheridan@gmail.com>2018-06-20 22:39:07 +0100
commitde6d2c524430287c699aaa898c1325da6afea539 (patch)
treef78eb841208d667668a7bc92a9290d693cc7103b /vendor/github.com/davecgh
parenteb99016e1629e690e55633de6fc63a14c53e7ea2 (diff)
Update dependencies
Diffstat (limited to 'vendor/github.com/davecgh')
-rw-r--r--vendor/github.com/davecgh/go-spew/spew/bypass.go187
-rw-r--r--vendor/github.com/davecgh/go-spew/spew/bypasssafe.go38
2 files changed, 128 insertions, 97 deletions
diff --git a/vendor/github.com/davecgh/go-spew/spew/bypass.go b/vendor/github.com/davecgh/go-spew/spew/bypass.go
index 7f166c3..7929947 100644
--- a/vendor/github.com/davecgh/go-spew/spew/bypass.go
+++ b/vendor/github.com/davecgh/go-spew/spew/bypass.go
@@ -16,7 +16,9 @@
// when the code is not running on Google App Engine, compiled by GopherJS, and
// "-tags safe" is not added to the go build command line. The "disableunsafe"
// tag is deprecated and thus should not be used.
-// +build !js,!appengine,!safe,!disableunsafe
+// Go versions prior to 1.4 are disabled because they use a different layout
+// for interfaces which make the implementation of unsafeReflectValue more complex.
+// +build !js,!appengine,!safe,!disableunsafe,go1.4
package spew
@@ -34,80 +36,49 @@ const (
ptrSize = unsafe.Sizeof((*byte)(nil))
)
+type flag uintptr
+
var (
- // offsetPtr, offsetScalar, and offsetFlag are the offsets for the
- // internal reflect.Value fields. These values are valid before golang
- // commit ecccf07e7f9d which changed the format. The are also valid
- // after commit 82f48826c6c7 which changed the format again to mirror
- // the original format. Code in the init function updates these offsets
- // as necessary.
- offsetPtr = ptrSize
- offsetScalar = uintptr(0)
- offsetFlag = ptrSize * 2
-
- // flagKindWidth and flagKindShift indicate various bits that the
- // reflect package uses internally to track kind information.
- //
- // flagRO indicates whether or not the value field of a reflect.Value is
- // read-only.
- //
- // flagIndir indicates whether the value field of a reflect.Value is
- // the actual data or a pointer to the data.
- //
- // These values are valid before golang commit 90a7c3c86944 which
- // changed their positions. Code in the init function updates these
- // flags as necessary.
- flagKindWidth = uintptr(5)
- flagKindShift = flagKindWidth - 1
- flagRO = uintptr(1 << 0)
- flagIndir = uintptr(1 << 1)
+ // flagRO indicates whether the value field of a reflect.Value
+ // is read-only.
+ flagRO flag
+
+ // flagAddr indicates whether the address of the reflect.Value's
+ // value may be taken.
+ flagAddr flag
)
-func init() {
- // Older versions of reflect.Value stored small integers directly in the
- // ptr field (which is named val in the older versions). Versions
- // between commits ecccf07e7f9d and 82f48826c6c7 added a new field named
- // scalar for this purpose which unfortunately came before the flag
- // field, so the offset of the flag field is different for those
- // versions.
- //
- // This code constructs a new reflect.Value from a known small integer
- // and checks if the size of the reflect.Value struct indicates it has
- // the scalar field. When it does, the offsets are updated accordingly.
- vv := reflect.ValueOf(0xf00)
- if unsafe.Sizeof(vv) == (ptrSize * 4) {
- offsetScalar = ptrSize * 2
- offsetFlag = ptrSize * 3
- }
+// flagKindMask holds the bits that make up the kind
+// part of the flags field. In all the supported versions,
+// it is in the lower 5 bits.
+const flagKindMask = flag(0x1f)
- // Commit 90a7c3c86944 changed the flag positions such that the low
- // order bits are the kind. This code extracts the kind from the flags
- // field and ensures it's the correct type. When it's not, the flag
- // order has been changed to the newer format, so the flags are updated
- // accordingly.
- upf := unsafe.Pointer(uintptr(unsafe.Pointer(&vv)) + offsetFlag)
- upfv := *(*uintptr)(upf)
- flagKindMask := uintptr((1<<flagKindWidth - 1) << flagKindShift)
- if (upfv&flagKindMask)>>flagKindShift != uintptr(reflect.Int) {
- flagKindShift = 0
- flagRO = 1 << 5
- flagIndir = 1 << 6
-
- // Commit adf9b30e5594 modified the flags to separate the
- // flagRO flag into two bits which specifies whether or not the
- // field is embedded. This causes flagIndir to move over a bit
- // and means that flagRO is the combination of either of the
- // original flagRO bit and the new bit.
- //
- // This code detects the change by extracting what used to be
- // the indirect bit to ensure it's set. When it's not, the flag
- // order has been changed to the newer format, so the flags are
- // updated accordingly.
- if upfv&flagIndir == 0 {
- flagRO = 3 << 5
- flagIndir = 1 << 7
- }
+// Different versions of Go have used different
+// bit layouts for the flags type. This table
+// records the known combinations.
+var okFlags = []struct {
+ ro, addr flag
+}{{
+ // From Go 1.4 to 1.5
+ ro: 1 << 5,
+ addr: 1 << 7,
+}, {
+ // Up to Go tip.
+ ro: 1<<5 | 1<<6,
+ addr: 1 << 8,
+}}
+
+var flagValOffset = func() uintptr {
+ field, ok := reflect.TypeOf(reflect.Value{}).FieldByName("flag")
+ if !ok {
+ panic("reflect.Value has no flag field")
}
+ return field.Offset
+}()
+
+// flagField returns a pointer to the flag field of a reflect.Value.
+func flagField(v *reflect.Value) *flag {
+ return (*flag)(unsafe.Pointer(uintptr(unsafe.Pointer(v)) + flagValOffset))
}
// unsafeReflectValue converts the passed reflect.Value into a one that bypasses
@@ -119,34 +90,56 @@ func init() {
// This allows us to check for implementations of the Stringer and error
// interfaces to be used for pretty printing ordinarily unaddressable and
// inaccessible values such as unexported struct fields.
-func unsafeReflectValue(v reflect.Value) (rv reflect.Value) {
- indirects := 1
- vt := v.Type()
- upv := unsafe.Pointer(uintptr(unsafe.Pointer(&v)) + offsetPtr)
- rvf := *(*uintptr)(unsafe.Pointer(uintptr(unsafe.Pointer(&v)) + offsetFlag))
- if rvf&flagIndir != 0 {
- vt = reflect.PtrTo(v.Type())
- indirects++
- } else if offsetScalar != 0 {
- // The value is in the scalar field when it's not one of the
- // reference types.
- switch vt.Kind() {
- case reflect.Uintptr:
- case reflect.Chan:
- case reflect.Func:
- case reflect.Map:
- case reflect.Ptr:
- case reflect.UnsafePointer:
- default:
- upv = unsafe.Pointer(uintptr(unsafe.Pointer(&v)) +
- offsetScalar)
- }
+func unsafeReflectValue(v reflect.Value) reflect.Value {
+ if !v.IsValid() || (v.CanInterface() && v.CanAddr()) {
+ return v
}
+ flagFieldPtr := flagField(&v)
+ *flagFieldPtr &^= flagRO
+ *flagFieldPtr |= flagAddr
+ return v
+}
- pv := reflect.NewAt(vt, upv)
- rv = pv
- for i := 0; i < indirects; i++ {
- rv = rv.Elem()
+// Sanity checks against future reflect package changes
+// to the type or semantics of the Value.flag field.
+func init() {
+ field, ok := reflect.TypeOf(reflect.Value{}).FieldByName("flag")
+ if !ok {
+ panic("reflect.Value has no flag field")
+ }
+ if field.Type.Kind() != reflect.TypeOf(flag(0)).Kind() {
+ panic("reflect.Value flag field has changed kind")
+ }
+ type t0 int
+ var t struct {
+ A t0
+ // t0 will have flagEmbedRO set.
+ t0
+ // a will have flagStickyRO set
+ a t0
+ }
+ vA := reflect.ValueOf(t).FieldByName("A")
+ va := reflect.ValueOf(t).FieldByName("a")
+ vt0 := reflect.ValueOf(t).FieldByName("t0")
+
+ // Infer flagRO from the difference between the flags
+ // for the (otherwise identical) fields in t.
+ flagPublic := *flagField(&vA)
+ flagWithRO := *flagField(&va) | *flagField(&vt0)
+ flagRO = flagPublic ^ flagWithRO
+
+ // Infer flagAddr from the difference between a value
+ // taken from a pointer and not.
+ vPtrA := reflect.ValueOf(&t).Elem().FieldByName("A")
+ flagNoPtr := *flagField(&vA)
+ flagPtr := *flagField(&vPtrA)
+ flagAddr = flagNoPtr ^ flagPtr
+
+ // Check that the inferred flags tally with one of the known versions.
+ for _, f := range okFlags {
+ if flagRO == f.ro && flagAddr == f.addr {
+ return
+ }
}
- return rv
+ panic("reflect.Value read-only flag has changed semantics")
}
diff --git a/vendor/github.com/davecgh/go-spew/spew/bypasssafe.go b/vendor/github.com/davecgh/go-spew/spew/bypasssafe.go
new file mode 100644
index 0000000..205c28d
--- /dev/null
+++ b/vendor/github.com/davecgh/go-spew/spew/bypasssafe.go
@@ -0,0 +1,38 @@
+// Copyright (c) 2015-2016 Dave Collins <dave@davec.name>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+// NOTE: Due to the following build constraints, this file will only be compiled
+// when the code is running on Google App Engine, compiled by GopherJS, or
+// "-tags safe" is added to the go build command line. The "disableunsafe"
+// tag is deprecated and thus should not be used.
+// +build js appengine safe disableunsafe !go1.4
+
+package spew
+
+import "reflect"
+
+const (
+ // UnsafeDisabled is a build-time constant which specifies whether or
+ // not access to the unsafe package is available.
+ UnsafeDisabled = true
+)
+
+// unsafeReflectValue typically converts the passed reflect.Value into a one
+// that bypasses the typical safety restrictions preventing access to
+// unaddressable and unexported data. However, doing this relies on access to
+// the unsafe package. This is a stub version which simply returns the passed
+// reflect.Value when the unsafe package is not available.
+func unsafeReflectValue(v reflect.Value) reflect.Value {
+ return v
+}