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-rw-r--r--pkg/bits/BUILD55
-rw-r--r--pkg/bits/bits32.go33
-rw-r--r--pkg/bits/bits64.go33
-rw-r--r--pkg/bits/bits_state_autogen.go6
-rw-r--r--pkg/bits/bits_template.go52
-rw-r--r--pkg/bits/uint64_test.go134
6 files changed, 72 insertions, 241 deletions
diff --git a/pkg/bits/BUILD b/pkg/bits/BUILD
deleted file mode 100644
index 63f4670d7..000000000
--- a/pkg/bits/BUILD
+++ /dev/null
@@ -1,55 +0,0 @@
-load("//tools:defs.bzl", "go_library", "go_test")
-load("//tools/go_generics:defs.bzl", "go_template", "go_template_instance")
-
-package(licenses = ["notice"])
-
-go_library(
- name = "bits",
- srcs = [
- "bits.go",
- "bits32.go",
- "bits64.go",
- "uint64_arch.go",
- "uint64_arch_amd64_asm.s",
- "uint64_arch_arm64_asm.s",
- "uint64_arch_generic.go",
- ],
- visibility = ["//:sandbox"],
-)
-
-go_template(
- name = "bits_template",
- srcs = ["bits_template.go"],
- types = [
- "T",
- ],
-)
-
-go_template_instance(
- name = "bits64",
- out = "bits64.go",
- package = "bits",
- suffix = "64",
- template = ":bits_template",
- types = {
- "T": "uint64",
- },
-)
-
-go_template_instance(
- name = "bits32",
- out = "bits32.go",
- package = "bits",
- suffix = "32",
- template = ":bits_template",
- types = {
- "T": "uint32",
- },
-)
-
-go_test(
- name = "bits_test",
- size = "small",
- srcs = ["uint64_test.go"],
- library = ":bits",
-)
diff --git a/pkg/bits/bits32.go b/pkg/bits/bits32.go
new file mode 100644
index 000000000..28134a9e7
--- /dev/null
+++ b/pkg/bits/bits32.go
@@ -0,0 +1,33 @@
+package bits
+
+// IsOn returns true if *all* bits set in 'bits' are set in 'mask'.
+func IsOn32(mask, bits uint32) bool {
+ return mask&bits == bits
+}
+
+// IsAnyOn returns true if *any* bit set in 'bits' is set in 'mask'.
+func IsAnyOn32(mask, bits uint32) bool {
+ return mask&bits != 0
+}
+
+// Mask returns a T with all of the given bits set.
+func Mask32(is ...int) uint32 {
+ ret := uint32(0)
+ for _, i := range is {
+ ret |= MaskOf32(i)
+ }
+ return ret
+}
+
+// MaskOf is like Mask, but sets only a single bit (more efficiently).
+func MaskOf32(i int) uint32 {
+ return uint32(1) << uint32(i)
+}
+
+// IsPowerOfTwo returns true if v is power of 2.
+func IsPowerOfTwo32(v uint32) bool {
+ if v == 0 {
+ return false
+ }
+ return v&(v-1) == 0
+}
diff --git a/pkg/bits/bits64.go b/pkg/bits/bits64.go
new file mode 100644
index 000000000..73117b19b
--- /dev/null
+++ b/pkg/bits/bits64.go
@@ -0,0 +1,33 @@
+package bits
+
+// IsOn returns true if *all* bits set in 'bits' are set in 'mask'.
+func IsOn64(mask, bits uint64) bool {
+ return mask&bits == bits
+}
+
+// IsAnyOn returns true if *any* bit set in 'bits' is set in 'mask'.
+func IsAnyOn64(mask, bits uint64) bool {
+ return mask&bits != 0
+}
+
+// Mask returns a T with all of the given bits set.
+func Mask64(is ...int) uint64 {
+ ret := uint64(0)
+ for _, i := range is {
+ ret |= MaskOf64(i)
+ }
+ return ret
+}
+
+// MaskOf is like Mask, but sets only a single bit (more efficiently).
+func MaskOf64(i int) uint64 {
+ return uint64(1) << uint64(i)
+}
+
+// IsPowerOfTwo returns true if v is power of 2.
+func IsPowerOfTwo64(v uint64) bool {
+ if v == 0 {
+ return false
+ }
+ return v&(v-1) == 0
+}
diff --git a/pkg/bits/bits_state_autogen.go b/pkg/bits/bits_state_autogen.go
new file mode 100644
index 000000000..22b8250c6
--- /dev/null
+++ b/pkg/bits/bits_state_autogen.go
@@ -0,0 +1,6 @@
+// automatically generated by stateify.
+
+// +build amd64 arm64
+// +build !amd64,!arm64
+
+package bits
diff --git a/pkg/bits/bits_template.go b/pkg/bits/bits_template.go
deleted file mode 100644
index 998645388..000000000
--- a/pkg/bits/bits_template.go
+++ /dev/null
@@ -1,52 +0,0 @@
-// Copyright 2018 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package bits
-
-// Non-atomic bit operations on a template type T.
-
-// T is a required type parameter that must be an integral type.
-type T uint64
-
-// IsOn returns true if *all* bits set in 'bits' are set in 'mask'.
-func IsOn(mask, bits T) bool {
- return mask&bits == bits
-}
-
-// IsAnyOn returns true if *any* bit set in 'bits' is set in 'mask'.
-func IsAnyOn(mask, bits T) bool {
- return mask&bits != 0
-}
-
-// Mask returns a T with all of the given bits set.
-func Mask(is ...int) T {
- ret := T(0)
- for _, i := range is {
- ret |= MaskOf(i)
- }
- return ret
-}
-
-// MaskOf is like Mask, but sets only a single bit (more efficiently).
-func MaskOf(i int) T {
- return T(1) << T(i)
-}
-
-// IsPowerOfTwo returns true if v is power of 2.
-func IsPowerOfTwo(v T) bool {
- if v == 0 {
- return false
- }
- return v&(v-1) == 0
-}
diff --git a/pkg/bits/uint64_test.go b/pkg/bits/uint64_test.go
deleted file mode 100644
index 193d1ebcd..000000000
--- a/pkg/bits/uint64_test.go
+++ /dev/null
@@ -1,134 +0,0 @@
-// Copyright 2018 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package bits
-
-import (
- "reflect"
- "testing"
-)
-
-func TestTrailingZeros64(t *testing.T) {
- for i := 0; i <= 64; i++ {
- n := uint64(1) << uint(i)
- if got, want := TrailingZeros64(n), i; got != want {
- t.Errorf("TrailingZeros64(%#x): got %d, wanted %d", n, got, want)
- }
- }
-
- for i := 0; i < 64; i++ {
- n := ^uint64(0) << uint(i)
- if got, want := TrailingZeros64(n), i; got != want {
- t.Errorf("TrailingZeros64(%#x): got %d, wanted %d", n, got, want)
- }
- }
-
- for i := 0; i < 64; i++ {
- n := ^uint64(0) >> uint(i)
- if got, want := TrailingZeros64(n), 0; got != want {
- t.Errorf("TrailingZeros64(%#x): got %d, wanted %d", n, got, want)
- }
- }
-}
-
-func TestMostSignificantOne64(t *testing.T) {
- for i := 0; i <= 64; i++ {
- n := uint64(1) << uint(i)
- if got, want := MostSignificantOne64(n), i; got != want {
- t.Errorf("MostSignificantOne64(%#x): got %d, wanted %d", n, got, want)
- }
- }
-
- for i := 0; i < 64; i++ {
- n := ^uint64(0) >> uint(i)
- if got, want := MostSignificantOne64(n), 63-i; got != want {
- t.Errorf("MostSignificantOne64(%#x): got %d, wanted %d", n, got, want)
- }
- }
-
- for i := 0; i < 64; i++ {
- n := ^uint64(0) << uint(i)
- if got, want := MostSignificantOne64(n), 63; got != want {
- t.Errorf("MostSignificantOne64(%#x): got %d, wanted %d", n, got, want)
- }
- }
-}
-
-func TestForEachSetBit64(t *testing.T) {
- for _, want := range [][]int{
- {},
- {0},
- {1},
- {63},
- {0, 1},
- {1, 3, 5},
- {0, 63},
- } {
- n := Mask64(want...)
- // "Slice values are deeply equal when ... they are both nil or both
- // non-nil ..."
- got := make([]int, 0)
- ForEachSetBit64(n, func(i int) {
- got = append(got, i)
- })
- if !reflect.DeepEqual(got, want) {
- t.Errorf("ForEachSetBit64(%#x): iterated bits %v, wanted %v", n, got, want)
- }
- }
-}
-
-func TestIsOn(t *testing.T) {
- type spec struct {
- mask uint64
- bits uint64
- any bool
- all bool
- }
- for _, s := range []spec{
- {Mask64(0), Mask64(0), true, true},
- {Mask64(63), Mask64(63), true, true},
- {Mask64(0), Mask64(1), false, false},
- {Mask64(0), Mask64(0, 1), true, false},
-
- {Mask64(1, 63), Mask64(1), true, true},
- {Mask64(1, 63), Mask64(1, 63), true, true},
- {Mask64(1, 63), Mask64(0, 1, 63), true, false},
- {Mask64(1, 63), Mask64(0, 62), false, false},
- } {
- if ok := IsAnyOn64(s.mask, s.bits); ok != s.any {
- t.Errorf("IsAnyOn(%#x, %#x) = %v, wanted: %v", s.mask, s.bits, ok, s.any)
- }
- if ok := IsOn64(s.mask, s.bits); ok != s.all {
- t.Errorf("IsOn(%#x, %#x) = %v, wanted: %v", s.mask, s.bits, ok, s.all)
- }
- }
-}
-
-func TestIsPowerOfTwo(t *testing.T) {
- for _, tc := range []struct {
- v uint64
- want bool
- }{
- {v: 0, want: false},
- {v: 1, want: true},
- {v: 2, want: true},
- {v: 3, want: false},
- {v: 4, want: true},
- {v: 5, want: false},
- } {
- if got := IsPowerOfTwo64(tc.v); got != tc.want {
- t.Errorf("IsPowerOfTwo(%d) = %t, want: %t", tc.v, got, tc.want)
- }
- }
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 10:34:35 +0000