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-rw-r--r--pkg/ilist/BUILD7
-rw-r--r--pkg/ilist/list.go108
-rw-r--r--pkg/refs/BUILD15
-rw-r--r--pkg/refs/refcounter.go8
-rw-r--r--pkg/sentry/fs/BUILD1
-rw-r--r--pkg/sentry/kernel/BUILD4
-rw-r--r--pkg/sentry/kernel/futex/BUILD1
-rw-r--r--pkg/sentry/kernel/semaphore/BUILD1
-rw-r--r--pkg/sentry/mm/BUILD1
-rw-r--r--pkg/tcpip/network/fragmentation/BUILD1
-rw-r--r--pkg/tcpip/transport/ping/BUILD1
-rw-r--r--pkg/tcpip/transport/tcp/BUILD1
-rw-r--r--pkg/tcpip/transport/udp/BUILD1
13 files changed, 100 insertions, 50 deletions
diff --git a/pkg/ilist/BUILD b/pkg/ilist/BUILD
index b26a39132..1bd71b800 100644
--- a/pkg/ilist/BUILD
+++ b/pkg/ilist/BUILD
@@ -28,6 +28,7 @@ go_template_instance(
prefix = "direct",
template = ":generic_list",
types = {
+ "Element": "*direct",
"Linker": "*direct",
},
)
@@ -47,6 +48,10 @@ go_template(
srcs = [
"list.go",
],
- opt_types = ["Linker"],
+ opt_types = [
+ "Element",
+ "ElementMapper",
+ "Linker",
+ ],
visibility = ["//visibility:public"],
)
diff --git a/pkg/ilist/list.go b/pkg/ilist/list.go
index a88b82196..4ae02eee9 100644
--- a/pkg/ilist/list.go
+++ b/pkg/ilist/list.go
@@ -21,12 +21,34 @@ package ilist
// N.B. When substituted in a template instantiation, Linker doesn't need to
// be an interface, and in most cases won't be.
type Linker interface {
- Next() Linker
- Prev() Linker
- SetNext(Linker)
- SetPrev(Linker)
+ Next() Element
+ Prev() Element
+ SetNext(Element)
+ SetPrev(Element)
}
+// Element the item that is used at the API level.
+//
+// N.B. Like Linker, this is unlikely to be an interface in most cases.
+type Element interface {
+ Linker
+}
+
+// ElementMapper provides an identity mapping by default.
+//
+// This can be replaced to provide a struct that maps elements to linker
+// objects, if they are not the same. An ElementMapper is not typically
+// required if: Linker is left as is, Element is left as is, or Linker and
+// Element are the same type.
+type ElementMapper struct{}
+
+// linkerFor maps an Element to a Linker.
+//
+// This default implementation should be inlined.
+//
+//go:nosplit
+func (ElementMapper) linkerFor(elem Element) Linker { return elem }
+
// List is an intrusive list. Entries can be added to or removed from the list
// in O(1) time and with no additional memory allocations.
//
@@ -39,8 +61,8 @@ type Linker interface {
//
// +stateify savable
type List struct {
- head Linker
- tail Linker
+ head Element
+ tail Element
}
// Reset resets list l to the empty state.
@@ -55,22 +77,22 @@ func (l *List) Empty() bool {
}
// Front returns the first element of list l or nil.
-func (l *List) Front() Linker {
+func (l *List) Front() Element {
return l.head
}
// Back returns the last element of list l or nil.
-func (l *List) Back() Linker {
+func (l *List) Back() Element {
return l.tail
}
// PushFront inserts the element e at the front of list l.
-func (l *List) PushFront(e Linker) {
- e.SetNext(l.head)
- e.SetPrev(nil)
+func (l *List) PushFront(e Element) {
+ ElementMapper{}.linkerFor(e).SetNext(l.head)
+ ElementMapper{}.linkerFor(e).SetPrev(nil)
if l.head != nil {
- l.head.SetPrev(e)
+ ElementMapper{}.linkerFor(l.head).SetPrev(e)
} else {
l.tail = e
}
@@ -79,12 +101,12 @@ func (l *List) PushFront(e Linker) {
}
// PushBack inserts the element e at the back of list l.
-func (l *List) PushBack(e Linker) {
- e.SetNext(nil)
- e.SetPrev(l.tail)
+func (l *List) PushBack(e Element) {
+ ElementMapper{}.linkerFor(e).SetNext(nil)
+ ElementMapper{}.linkerFor(e).SetPrev(l.tail)
if l.tail != nil {
- l.tail.SetNext(e)
+ ElementMapper{}.linkerFor(l.tail).SetNext(e)
} else {
l.head = e
}
@@ -98,8 +120,8 @@ func (l *List) PushBackList(m *List) {
l.head = m.head
l.tail = m.tail
} else if m.head != nil {
- l.tail.SetNext(m.head)
- m.head.SetPrev(l.tail)
+ ElementMapper{}.linkerFor(l.tail).SetNext(m.head)
+ ElementMapper{}.linkerFor(m.head).SetPrev(l.tail)
l.tail = m.tail
}
@@ -109,46 +131,46 @@ func (l *List) PushBackList(m *List) {
}
// InsertAfter inserts e after b.
-func (l *List) InsertAfter(b, e Linker) {
- a := b.Next()
- e.SetNext(a)
- e.SetPrev(b)
- b.SetNext(e)
+func (l *List) InsertAfter(b, e Element) {
+ a := ElementMapper{}.linkerFor(b).Next()
+ ElementMapper{}.linkerFor(e).SetNext(a)
+ ElementMapper{}.linkerFor(e).SetPrev(b)
+ ElementMapper{}.linkerFor(b).SetNext(e)
if a != nil {
- a.SetPrev(e)
+ ElementMapper{}.linkerFor(a).SetPrev(e)
} else {
l.tail = e
}
}
// InsertBefore inserts e before a.
-func (l *List) InsertBefore(a, e Linker) {
- b := a.Prev()
- e.SetNext(a)
- e.SetPrev(b)
- a.SetPrev(e)
+func (l *List) InsertBefore(a, e Element) {
+ b := ElementMapper{}.linkerFor(a).Prev()
+ ElementMapper{}.linkerFor(e).SetNext(a)
+ ElementMapper{}.linkerFor(e).SetPrev(b)
+ ElementMapper{}.linkerFor(a).SetPrev(e)
if b != nil {
- b.SetNext(e)
+ ElementMapper{}.linkerFor(b).SetNext(e)
} else {
l.head = e
}
}
// Remove removes e from l.
-func (l *List) Remove(e Linker) {
- prev := e.Prev()
- next := e.Next()
+func (l *List) Remove(e Element) {
+ prev := ElementMapper{}.linkerFor(e).Prev()
+ next := ElementMapper{}.linkerFor(e).Next()
if prev != nil {
- prev.SetNext(next)
+ ElementMapper{}.linkerFor(prev).SetNext(next)
} else {
l.head = next
}
if next != nil {
- next.SetPrev(prev)
+ ElementMapper{}.linkerFor(next).SetPrev(prev)
} else {
l.tail = prev
}
@@ -160,26 +182,26 @@ func (l *List) Remove(e Linker) {
//
// +stateify savable
type Entry struct {
- next Linker
- prev Linker
+ next Element
+ prev Element
}
// Next returns the entry that follows e in the list.
-func (e *Entry) Next() Linker {
+func (e *Entry) Next() Element {
return e.next
}
// Prev returns the entry that precedes e in the list.
-func (e *Entry) Prev() Linker {
+func (e *Entry) Prev() Element {
return e.prev
}
// SetNext assigns 'entry' as the entry that follows e in the list.
-func (e *Entry) SetNext(entry Linker) {
- e.next = entry
+func (e *Entry) SetNext(elem Element) {
+ e.next = elem
}
// SetPrev assigns 'entry' as the entry that precedes e in the list.
-func (e *Entry) SetPrev(entry Linker) {
- e.prev = entry
+func (e *Entry) SetPrev(elem Element) {
+ e.prev = elem
}
diff --git a/pkg/refs/BUILD b/pkg/refs/BUILD
index 3ea877ccf..98150ba8f 100644
--- a/pkg/refs/BUILD
+++ b/pkg/refs/BUILD
@@ -1,16 +1,29 @@
package(licenses = ["notice"]) # Apache 2.0
+load("//tools/go_generics:defs.bzl", "go_template_instance")
load("//tools/go_stateify:defs.bzl", "go_library", "go_test")
+go_template_instance(
+ name = "weak_ref_list",
+ out = "weak_ref_list.go",
+ package = "refs",
+ prefix = "weakRef",
+ template = "//pkg/ilist:generic_list",
+ types = {
+ "Element": "*WeakRef",
+ "Linker": "*WeakRef",
+ },
+)
+
go_library(
name = "refs",
srcs = [
"refcounter.go",
"refcounter_state.go",
+ "weak_ref_list.go",
],
importpath = "gvisor.googlesource.com/gvisor/pkg/refs",
visibility = ["//:sandbox"],
- deps = ["//pkg/ilist"],
)
go_test(
diff --git a/pkg/refs/refcounter.go b/pkg/refs/refcounter.go
index 0d44c2499..638a93bab 100644
--- a/pkg/refs/refcounter.go
+++ b/pkg/refs/refcounter.go
@@ -20,8 +20,6 @@ import (
"reflect"
"sync"
"sync/atomic"
-
- "gvisor.googlesource.com/gvisor/pkg/ilist"
)
// RefCounter is the interface to be implemented by objects that are reference
@@ -61,7 +59,7 @@ type WeakRefUser interface {
//
// +stateify savable
type WeakRef struct {
- ilist.Entry `state:"nosave"`
+ weakRefEntry `state:"nosave"`
// obj is an atomic value that points to the refCounter.
obj atomic.Value `state:".(savedReference)"`
@@ -195,7 +193,7 @@ type AtomicRefCount struct {
mu sync.Mutex `state:"nosave"`
// weakRefs is our collection of weak references.
- weakRefs ilist.List `state:"nosave"`
+ weakRefs weakRefList `state:"nosave"`
}
// ReadRefs returns the current number of references. The returned count is
@@ -276,7 +274,7 @@ func (r *AtomicRefCount) DecRefWithDestructor(destroy func()) {
// return false due to the reference count check.
r.mu.Lock()
for !r.weakRefs.Empty() {
- w := r.weakRefs.Front().(*WeakRef)
+ w := r.weakRefs.Front()
// Capture the callback because w cannot be touched
// after it's zapped -- the owner is free it reuse it
// after that.
diff --git a/pkg/sentry/fs/BUILD b/pkg/sentry/fs/BUILD
index 18cd5ae8e..a949fffbf 100644
--- a/pkg/sentry/fs/BUILD
+++ b/pkg/sentry/fs/BUILD
@@ -78,6 +78,7 @@ go_template_instance(
template = "//pkg/ilist:generic_list",
types = {
"Linker": "*Dirent",
+ "Element": "*Dirent",
},
)
diff --git a/pkg/sentry/kernel/BUILD b/pkg/sentry/kernel/BUILD
index 0bc735550..7eb2bffeb 100644
--- a/pkg/sentry/kernel/BUILD
+++ b/pkg/sentry/kernel/BUILD
@@ -10,6 +10,7 @@ go_template_instance(
prefix = "pendingSignal",
template = "//pkg/ilist:generic_list",
types = {
+ "Element": "*pendingSignal",
"Linker": "*pendingSignal",
},
)
@@ -21,6 +22,7 @@ go_template_instance(
prefix = "processGroup",
template = "//pkg/ilist:generic_list",
types = {
+ "Element": "*ProcessGroup",
"Linker": "*ProcessGroup",
},
)
@@ -43,6 +45,7 @@ go_template_instance(
prefix = "session",
template = "//pkg/ilist:generic_list",
types = {
+ "Element": "*Session",
"Linker": "*Session",
},
)
@@ -54,6 +57,7 @@ go_template_instance(
prefix = "task",
template = "//pkg/ilist:generic_list",
types = {
+ "Element": "*Task",
"Linker": "*Task",
},
)
diff --git a/pkg/sentry/kernel/futex/BUILD b/pkg/sentry/kernel/futex/BUILD
index b44a26974..0ff5b0a95 100644
--- a/pkg/sentry/kernel/futex/BUILD
+++ b/pkg/sentry/kernel/futex/BUILD
@@ -10,6 +10,7 @@ go_template_instance(
prefix = "waiter",
template = "//pkg/ilist:generic_list",
types = {
+ "Element": "*Waiter",
"Linker": "*Waiter",
},
)
diff --git a/pkg/sentry/kernel/semaphore/BUILD b/pkg/sentry/kernel/semaphore/BUILD
index e7fa44e2c..bdcf4ce5c 100644
--- a/pkg/sentry/kernel/semaphore/BUILD
+++ b/pkg/sentry/kernel/semaphore/BUILD
@@ -10,6 +10,7 @@ go_template_instance(
prefix = "waiter",
template = "//pkg/ilist:generic_list",
types = {
+ "Element": "*waiter",
"Linker": "*waiter",
},
)
diff --git a/pkg/sentry/mm/BUILD b/pkg/sentry/mm/BUILD
index bbdfae247..ad9231774 100644
--- a/pkg/sentry/mm/BUILD
+++ b/pkg/sentry/mm/BUILD
@@ -67,6 +67,7 @@ go_template_instance(
prefix = "io",
template = "//pkg/ilist:generic_list",
types = {
+ "Element": "*ioResult",
"Linker": "*ioResult",
},
)
diff --git a/pkg/tcpip/network/fragmentation/BUILD b/pkg/tcpip/network/fragmentation/BUILD
index 83b4d253f..aaabfcb9a 100644
--- a/pkg/tcpip/network/fragmentation/BUILD
+++ b/pkg/tcpip/network/fragmentation/BUILD
@@ -10,6 +10,7 @@ go_template_instance(
prefix = "reassembler",
template = "//pkg/ilist:generic_list",
types = {
+ "Element": "*reassembler",
"Linker": "*reassembler",
},
)
diff --git a/pkg/tcpip/transport/ping/BUILD b/pkg/tcpip/transport/ping/BUILD
index 117532fea..982b6795c 100644
--- a/pkg/tcpip/transport/ping/BUILD
+++ b/pkg/tcpip/transport/ping/BUILD
@@ -10,6 +10,7 @@ go_template_instance(
prefix = "pingPacket",
template = "//pkg/ilist:generic_list",
types = {
+ "Element": "*pingPacket",
"Linker": "*pingPacket",
},
)
diff --git a/pkg/tcpip/transport/tcp/BUILD b/pkg/tcpip/transport/tcp/BUILD
index 8b911c295..c7943f08e 100644
--- a/pkg/tcpip/transport/tcp/BUILD
+++ b/pkg/tcpip/transport/tcp/BUILD
@@ -10,6 +10,7 @@ go_template_instance(
prefix = "segment",
template = "//pkg/ilist:generic_list",
types = {
+ "Element": "*segment",
"Linker": "*segment",
},
)
diff --git a/pkg/tcpip/transport/udp/BUILD b/pkg/tcpip/transport/udp/BUILD
index 1a3a62d3d..4225e28dc 100644
--- a/pkg/tcpip/transport/udp/BUILD
+++ b/pkg/tcpip/transport/udp/BUILD
@@ -10,6 +10,7 @@ go_template_instance(
prefix = "udpPacket",
template = "//pkg/ilist:generic_list",
types = {
+ "Element": "*udpPacket",
"Linker": "*udpPacket",
},
)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 20:08:39 +0000