mirror of
https://github.com/superseriousbusiness/gotosocial
synced 2024-12-12 00:26:39 +01:00
1351 lines
41 KiB
Go
1351 lines
41 KiB
Go
// Copyright (c) 2012-2020 Ugorji Nwoke. All rights reserved.
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// Use of this source code is governed by a MIT license found in the LICENSE file.
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//go:build !safe && !codec.safe && !appengine && go1.9
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// +build !safe,!codec.safe,!appengine,go1.9
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// minimum of go 1.9 is needed, as that is the minimum for all features and linked functions we need
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// - typedmemclr was introduced in go 1.8
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// - mapassign_fastXXX was introduced in go 1.9
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// etc
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package codec
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import (
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"reflect"
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_ "runtime" // needed for go linkname(s)
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"sync/atomic"
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"time"
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"unsafe"
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)
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// This file has unsafe variants of some helper functions.
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// MARKER: See helper_unsafe.go for the usage documentation.
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// There are a number of helper_*unsafe*.go files.
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//
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// - helper_unsafe
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// unsafe variants of dependent functions
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// - helper_unsafe_compiler_gc (gc)
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// unsafe variants of dependent functions which cannot be shared with gollvm or gccgo
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// - helper_not_unsafe_not_gc (gccgo/gollvm or safe)
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// safe variants of functions in helper_unsafe_compiler_gc
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// - helper_not_unsafe (safe)
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// safe variants of functions in helper_unsafe
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// - helper_unsafe_compiler_not_gc (gccgo, gollvm)
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// unsafe variants of functions/variables which non-standard compilers need
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//
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// This way, we can judiciously use build tags to include the right set of files
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// for any compiler, and make it run optimally in unsafe mode.
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//
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// As of March 2021, we cannot differentiate whether running with gccgo or gollvm
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// using a build constraint, as both satisfy 'gccgo' build tag.
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// Consequently, we must use the lowest common denominator to support both.
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// For reflect.Value code, we decided to do the following:
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// - if we know the kind, we can elide conditional checks for
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// - SetXXX (Int, Uint, String, Bool, etc)
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// - SetLen
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//
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// We can also optimize
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// - IsNil
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// MARKER: Some functions here will not be hit during code coverage runs due to optimizations, e.g.
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// - rvCopySlice: called by decode if rvGrowSlice did not set new slice into pointer to orig slice.
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// however, helper_unsafe sets it, so no need to call rvCopySlice later
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// - rvSlice: same as above
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const safeMode = false
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// helperUnsafeDirectAssignMapEntry says that we should not copy the pointer in the map
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// to another value during mapRange/iteration and mapGet calls, but directly assign it.
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//
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// The only callers of mapRange/iteration is encode.
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// Here, we just walk through the values and encode them
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//
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// The only caller of mapGet is decode.
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// Here, it does a Get if the underlying value is a pointer, and decodes into that.
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//
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// For both users, we are very careful NOT to modify or keep the pointers around.
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// Consequently, it is ok for take advantage of the performance that the map is not modified
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// during an iteration and we can just "peek" at the internal value" in the map and use it.
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const helperUnsafeDirectAssignMapEntry = true
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// MARKER: keep in sync with GO_ROOT/src/reflect/value.go
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const (
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unsafeFlagStickyRO = 1 << 5
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unsafeFlagEmbedRO = 1 << 6
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unsafeFlagIndir = 1 << 7
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unsafeFlagAddr = 1 << 8
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unsafeFlagRO = unsafeFlagStickyRO | unsafeFlagEmbedRO
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// unsafeFlagKindMask = (1 << 5) - 1 // 5 bits for 27 kinds (up to 31)
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// unsafeTypeKindDirectIface = 1 << 5
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)
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// transientSizeMax below is used in TransientAddr as the backing storage.
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//
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// Must be >= 16 as the maximum size is a complex128 (or string on 64-bit machines).
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const transientSizeMax = 64
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// should struct/array support internal strings and slices?
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const transientValueHasStringSlice = false
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type unsafeString struct {
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Data unsafe.Pointer
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Len int
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}
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type unsafeSlice struct {
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Data unsafe.Pointer
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Len int
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Cap int
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}
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type unsafeIntf struct {
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typ unsafe.Pointer
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ptr unsafe.Pointer
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}
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type unsafeReflectValue struct {
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unsafeIntf
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flag uintptr
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}
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// keep in sync with stdlib runtime/type.go
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type unsafeRuntimeType struct {
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size uintptr
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// ... many other fields here
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}
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// unsafeZeroAddr and unsafeZeroSlice points to a read-only block of memory
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// used for setting a zero value for most types or creating a read-only
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// zero value for a given type.
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var (
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unsafeZeroAddr = unsafe.Pointer(&unsafeZeroArr[0])
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unsafeZeroSlice = unsafeSlice{unsafeZeroAddr, 0, 0}
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)
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// We use a scratch memory and an unsafeSlice for transient values:
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//
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// unsafeSlice is used for standalone strings and slices (outside an array or struct).
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// scratch memory is used for other kinds, based on contract below:
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// - numbers, bool are always transient
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// - structs and arrays are transient iff they have no pointers i.e.
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// no string, slice, chan, func, interface, map, etc only numbers and bools.
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// - slices and strings are transient (using the unsafeSlice)
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type unsafePerTypeElem struct {
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arr [transientSizeMax]byte // for bool, number, struct, array kinds
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slice unsafeSlice // for string and slice kinds
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}
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func (x *unsafePerTypeElem) addrFor(k reflect.Kind) unsafe.Pointer {
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if k == reflect.String || k == reflect.Slice {
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x.slice = unsafeSlice{} // memclr
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return unsafe.Pointer(&x.slice)
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}
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x.arr = [transientSizeMax]byte{} // memclr
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return unsafe.Pointer(&x.arr)
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}
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type perType struct {
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elems [2]unsafePerTypeElem
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}
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type decPerType struct {
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perType
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}
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type encPerType struct{}
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// TransientAddrK is used for getting a *transient* value to be decoded into,
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// which will right away be used for something else.
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//
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// See notes in helper.go about "Transient values during decoding"
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func (x *perType) TransientAddrK(t reflect.Type, k reflect.Kind) reflect.Value {
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return rvZeroAddrTransientAnyK(t, k, x.elems[0].addrFor(k))
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}
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func (x *perType) TransientAddr2K(t reflect.Type, k reflect.Kind) reflect.Value {
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return rvZeroAddrTransientAnyK(t, k, x.elems[1].addrFor(k))
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}
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func (encPerType) AddressableRO(v reflect.Value) reflect.Value {
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return rvAddressableReadonly(v)
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}
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// byteAt returns the byte given an index which is guaranteed
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// to be within the bounds of the slice i.e. we defensively
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// already verified that the index is less than the length of the slice.
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func byteAt(b []byte, index uint) byte {
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// return b[index]
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return *(*byte)(unsafe.Pointer(uintptr((*unsafeSlice)(unsafe.Pointer(&b)).Data) + uintptr(index)))
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}
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func byteSliceOf(b []byte, start, end uint) []byte {
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s := (*unsafeSlice)(unsafe.Pointer(&b))
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s.Data = unsafe.Pointer(uintptr(s.Data) + uintptr(start))
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s.Len = int(end - start)
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s.Cap -= int(start)
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return b
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}
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// func byteSliceWithLen(b []byte, length uint) []byte {
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// (*unsafeSlice)(unsafe.Pointer(&b)).Len = int(length)
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// return b
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// }
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func setByteAt(b []byte, index uint, val byte) {
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// b[index] = val
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*(*byte)(unsafe.Pointer(uintptr((*unsafeSlice)(unsafe.Pointer(&b)).Data) + uintptr(index))) = val
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}
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// stringView returns a view of the []byte as a string.
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// In unsafe mode, it doesn't incur allocation and copying caused by conversion.
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// In regular safe mode, it is an allocation and copy.
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func stringView(v []byte) string {
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return *(*string)(unsafe.Pointer(&v))
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}
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// bytesView returns a view of the string as a []byte.
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// In unsafe mode, it doesn't incur allocation and copying caused by conversion.
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// In regular safe mode, it is an allocation and copy.
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func bytesView(v string) (b []byte) {
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sx := (*unsafeString)(unsafe.Pointer(&v))
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bx := (*unsafeSlice)(unsafe.Pointer(&b))
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bx.Data, bx.Len, bx.Cap = sx.Data, sx.Len, sx.Len
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return
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}
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func byteSliceSameData(v1 []byte, v2 []byte) bool {
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return (*unsafeSlice)(unsafe.Pointer(&v1)).Data == (*unsafeSlice)(unsafe.Pointer(&v2)).Data
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}
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// MARKER: okBytesN functions will copy N bytes into the top slots of the return array.
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// These functions expect that the bound check already occured and are are valid.
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// copy(...) does a number of checks which are unnecessary in this situation when in bounds.
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func okBytes2(b []byte) [2]byte {
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return *((*[2]byte)(((*unsafeSlice)(unsafe.Pointer(&b))).Data))
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}
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func okBytes3(b []byte) [3]byte {
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return *((*[3]byte)(((*unsafeSlice)(unsafe.Pointer(&b))).Data))
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}
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func okBytes4(b []byte) [4]byte {
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return *((*[4]byte)(((*unsafeSlice)(unsafe.Pointer(&b))).Data))
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}
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func okBytes8(b []byte) [8]byte {
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return *((*[8]byte)(((*unsafeSlice)(unsafe.Pointer(&b))).Data))
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}
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// isNil says whether the value v is nil.
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// This applies to references like map/ptr/unsafepointer/chan/func,
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// and non-reference values like interface/slice.
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func isNil(v interface{}) (rv reflect.Value, isnil bool) {
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var ui = (*unsafeIntf)(unsafe.Pointer(&v))
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isnil = ui.ptr == nil
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if !isnil {
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rv, isnil = unsafeIsNilIntfOrSlice(ui, v)
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}
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return
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}
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func unsafeIsNilIntfOrSlice(ui *unsafeIntf, v interface{}) (rv reflect.Value, isnil bool) {
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rv = reflect.ValueOf(v) // reflect.ValueOf is currently not inline'able - so call it directly
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tk := rv.Kind()
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isnil = (tk == reflect.Interface || tk == reflect.Slice) && *(*unsafe.Pointer)(ui.ptr) == nil
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return
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}
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// return the pointer for a reference (map/chan/func/pointer/unsafe.Pointer).
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// true references (map, func, chan, ptr - NOT slice) may be double-referenced? as flagIndir
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//
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// Assumes that v is a reference (map/func/chan/ptr/func)
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func rvRefPtr(v *unsafeReflectValue) unsafe.Pointer {
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if v.flag&unsafeFlagIndir != 0 {
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return *(*unsafe.Pointer)(v.ptr)
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}
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return v.ptr
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}
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func eq4i(i0, i1 interface{}) bool {
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v0 := (*unsafeIntf)(unsafe.Pointer(&i0))
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v1 := (*unsafeIntf)(unsafe.Pointer(&i1))
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return v0.typ == v1.typ && v0.ptr == v1.ptr
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}
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func rv4iptr(i interface{}) (v reflect.Value) {
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// Main advantage here is that it is inlined, nothing escapes to heap, i is never nil
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uv := (*unsafeReflectValue)(unsafe.Pointer(&v))
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uv.unsafeIntf = *(*unsafeIntf)(unsafe.Pointer(&i))
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uv.flag = uintptr(rkindPtr)
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return
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}
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func rv4istr(i interface{}) (v reflect.Value) {
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// Main advantage here is that it is inlined, nothing escapes to heap, i is never nil
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uv := (*unsafeReflectValue)(unsafe.Pointer(&v))
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uv.unsafeIntf = *(*unsafeIntf)(unsafe.Pointer(&i))
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uv.flag = uintptr(rkindString) | unsafeFlagIndir
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return
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}
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func rv2i(rv reflect.Value) (i interface{}) {
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// We tap into implememtation details from
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// the source go stdlib reflect/value.go, and trims the implementation.
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//
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// e.g.
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// - a map/ptr is a reference, thus flagIndir is not set on it
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// - an int/slice is not a reference, thus flagIndir is set on it
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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if refBitset.isset(byte(rv.Kind())) && urv.flag&unsafeFlagIndir != 0 {
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urv.ptr = *(*unsafe.Pointer)(urv.ptr)
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}
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return *(*interface{})(unsafe.Pointer(&urv.unsafeIntf))
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}
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func rvAddr(rv reflect.Value, ptrType reflect.Type) reflect.Value {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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urv.flag = (urv.flag & unsafeFlagRO) | uintptr(reflect.Ptr)
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urv.typ = ((*unsafeIntf)(unsafe.Pointer(&ptrType))).ptr
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return rv
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}
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func rvIsNil(rv reflect.Value) bool {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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if urv.flag&unsafeFlagIndir != 0 {
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return *(*unsafe.Pointer)(urv.ptr) == nil
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}
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return urv.ptr == nil
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}
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func rvSetSliceLen(rv reflect.Value, length int) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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(*unsafeString)(urv.ptr).Len = length
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}
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func rvZeroAddrK(t reflect.Type, k reflect.Kind) (rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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urv.typ = ((*unsafeIntf)(unsafe.Pointer(&t))).ptr
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urv.flag = uintptr(k) | unsafeFlagIndir | unsafeFlagAddr
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urv.ptr = unsafeNew(urv.typ)
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return
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}
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func rvZeroAddrTransientAnyK(t reflect.Type, k reflect.Kind, addr unsafe.Pointer) (rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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urv.typ = ((*unsafeIntf)(unsafe.Pointer(&t))).ptr
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urv.flag = uintptr(k) | unsafeFlagIndir | unsafeFlagAddr
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urv.ptr = addr
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return
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}
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func rvZeroK(t reflect.Type, k reflect.Kind) (rv reflect.Value) {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
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urv.typ = ((*unsafeIntf)(unsafe.Pointer(&t))).ptr
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if refBitset.isset(byte(k)) {
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urv.flag = uintptr(k)
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} else if rtsize2(urv.typ) <= uintptr(len(unsafeZeroArr)) {
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urv.flag = uintptr(k) | unsafeFlagIndir
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urv.ptr = unsafeZeroAddr
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} else { // meaning struct or array
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urv.flag = uintptr(k) | unsafeFlagIndir | unsafeFlagAddr
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urv.ptr = unsafeNew(urv.typ)
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}
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return
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}
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// rvConvert will convert a value to a different type directly,
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// ensuring that they still point to the same underlying value.
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func rvConvert(v reflect.Value, t reflect.Type) reflect.Value {
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uv := (*unsafeReflectValue)(unsafe.Pointer(&v))
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uv.typ = ((*unsafeIntf)(unsafe.Pointer(&t))).ptr
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return v
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}
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// rvAddressableReadonly returns an addressable reflect.Value.
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//
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// Use it within encode calls, when you just want to "read" the underlying ptr
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// without modifying the value.
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//
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// Note that it cannot be used for r/w use, as those non-addressable values
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// may have been stored in read-only memory, and trying to write the pointer
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// may cause a segfault.
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func rvAddressableReadonly(v reflect.Value) reflect.Value {
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// hack to make an addressable value out of a non-addressable one.
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// Assume folks calling it are passing a value that can be addressable, but isn't.
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// This assumes that the flagIndir is already set on it.
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// so we just set the flagAddr bit on the flag (and do not set the flagIndir).
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uv := (*unsafeReflectValue)(unsafe.Pointer(&v))
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uv.flag = uv.flag | unsafeFlagAddr // | unsafeFlagIndir
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return v
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}
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func rtsize2(rt unsafe.Pointer) uintptr {
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return ((*unsafeRuntimeType)(rt)).size
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}
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func rt2id(rt reflect.Type) uintptr {
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return uintptr(((*unsafeIntf)(unsafe.Pointer(&rt))).ptr)
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}
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func i2rtid(i interface{}) uintptr {
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return uintptr(((*unsafeIntf)(unsafe.Pointer(&i))).typ)
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}
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// --------------------------
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func unsafeCmpZero(ptr unsafe.Pointer, size int) bool {
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// verified that size is always within right range, so no chance of OOM
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var s1 = unsafeString{ptr, size}
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var s2 = unsafeString{unsafeZeroAddr, size}
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if size > len(unsafeZeroArr) {
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arr := make([]byte, size)
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s2.Data = unsafe.Pointer(&arr[0])
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}
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return *(*string)(unsafe.Pointer(&s1)) == *(*string)(unsafe.Pointer(&s2)) // memcmp
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}
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func isEmptyValue(v reflect.Value, tinfos *TypeInfos, recursive bool) bool {
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urv := (*unsafeReflectValue)(unsafe.Pointer(&v))
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if urv.flag == 0 {
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return true
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}
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if recursive {
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return isEmptyValueFallbackRecur(urv, v, tinfos)
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}
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return unsafeCmpZero(urv.ptr, int(rtsize2(urv.typ)))
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}
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func isEmptyValueFallbackRecur(urv *unsafeReflectValue, v reflect.Value, tinfos *TypeInfos) bool {
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const recursive = true
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switch v.Kind() {
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case reflect.Invalid:
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return true
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case reflect.String:
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return (*unsafeString)(urv.ptr).Len == 0
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case reflect.Slice:
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return (*unsafeSlice)(urv.ptr).Len == 0
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case reflect.Bool:
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return !*(*bool)(urv.ptr)
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case reflect.Int:
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return *(*int)(urv.ptr) == 0
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case reflect.Int8:
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return *(*int8)(urv.ptr) == 0
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case reflect.Int16:
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return *(*int16)(urv.ptr) == 0
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case reflect.Int32:
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return *(*int32)(urv.ptr) == 0
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case reflect.Int64:
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return *(*int64)(urv.ptr) == 0
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case reflect.Uint:
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return *(*uint)(urv.ptr) == 0
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case reflect.Uint8:
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return *(*uint8)(urv.ptr) == 0
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case reflect.Uint16:
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return *(*uint16)(urv.ptr) == 0
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case reflect.Uint32:
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return *(*uint32)(urv.ptr) == 0
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case reflect.Uint64:
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return *(*uint64)(urv.ptr) == 0
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case reflect.Uintptr:
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return *(*uintptr)(urv.ptr) == 0
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case reflect.Float32:
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return *(*float32)(urv.ptr) == 0
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case reflect.Float64:
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return *(*float64)(urv.ptr) == 0
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case reflect.Complex64:
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return unsafeCmpZero(urv.ptr, 8)
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case reflect.Complex128:
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return unsafeCmpZero(urv.ptr, 16)
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case reflect.Struct:
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// return isEmptyStruct(v, tinfos, recursive)
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if tinfos == nil {
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tinfos = defTypeInfos
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}
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ti := tinfos.find(uintptr(urv.typ))
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if ti == nil {
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ti = tinfos.load(v.Type())
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}
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return unsafeCmpZero(urv.ptr, int(ti.size))
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case reflect.Interface, reflect.Ptr:
|
|
// isnil := urv.ptr == nil // (not sufficient, as a pointer value encodes the type)
|
|
isnil := urv.ptr == nil || *(*unsafe.Pointer)(urv.ptr) == nil
|
|
if recursive && !isnil {
|
|
return isEmptyValue(v.Elem(), tinfos, recursive)
|
|
}
|
|
return isnil
|
|
case reflect.UnsafePointer:
|
|
return urv.ptr == nil || *(*unsafe.Pointer)(urv.ptr) == nil
|
|
case reflect.Chan:
|
|
return urv.ptr == nil || len_chan(rvRefPtr(urv)) == 0
|
|
case reflect.Map:
|
|
return urv.ptr == nil || len_map(rvRefPtr(urv)) == 0
|
|
case reflect.Array:
|
|
return v.Len() == 0 ||
|
|
urv.ptr == nil ||
|
|
urv.typ == nil ||
|
|
rtsize2(urv.typ) == 0 ||
|
|
unsafeCmpZero(urv.ptr, int(rtsize2(urv.typ)))
|
|
}
|
|
return false
|
|
}
|
|
|
|
// --------------------------
|
|
|
|
type structFieldInfos struct {
|
|
c unsafe.Pointer // source
|
|
s unsafe.Pointer // sorted
|
|
length int
|
|
}
|
|
|
|
func (x *structFieldInfos) load(source, sorted []*structFieldInfo) {
|
|
s := (*unsafeSlice)(unsafe.Pointer(&sorted))
|
|
x.s = s.Data
|
|
x.length = s.Len
|
|
s = (*unsafeSlice)(unsafe.Pointer(&source))
|
|
x.c = s.Data
|
|
}
|
|
|
|
func (x *structFieldInfos) sorted() (v []*structFieldInfo) {
|
|
*(*unsafeSlice)(unsafe.Pointer(&v)) = unsafeSlice{x.s, x.length, x.length}
|
|
// s := (*unsafeSlice)(unsafe.Pointer(&v))
|
|
// s.Data = x.sorted0
|
|
// s.Len = x.length
|
|
// s.Cap = s.Len
|
|
return
|
|
}
|
|
|
|
func (x *structFieldInfos) source() (v []*structFieldInfo) {
|
|
*(*unsafeSlice)(unsafe.Pointer(&v)) = unsafeSlice{x.c, x.length, x.length}
|
|
return
|
|
}
|
|
|
|
// atomicXXX is expected to be 2 words (for symmetry with atomic.Value)
|
|
//
|
|
// Note that we do not atomically load/store length and data pointer separately,
|
|
// as this could lead to some races. Instead, we atomically load/store cappedSlice.
|
|
//
|
|
// Note: with atomic.(Load|Store)Pointer, we MUST work with an unsafe.Pointer directly.
|
|
|
|
// ----------------------
|
|
type atomicTypeInfoSlice struct {
|
|
v unsafe.Pointer // *[]rtid2ti
|
|
}
|
|
|
|
func (x *atomicTypeInfoSlice) load() (s []rtid2ti) {
|
|
x2 := atomic.LoadPointer(&x.v)
|
|
if x2 != nil {
|
|
s = *(*[]rtid2ti)(x2)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (x *atomicTypeInfoSlice) store(p []rtid2ti) {
|
|
atomic.StorePointer(&x.v, unsafe.Pointer(&p))
|
|
}
|
|
|
|
// MARKER: in safe mode, atomicXXX are atomic.Value, which contains an interface{}.
|
|
// This is 2 words.
|
|
// consider padding atomicXXX here with a uintptr, so they fit into 2 words also.
|
|
|
|
// --------------------------
|
|
type atomicRtidFnSlice struct {
|
|
v unsafe.Pointer // *[]codecRtidFn
|
|
}
|
|
|
|
func (x *atomicRtidFnSlice) load() (s []codecRtidFn) {
|
|
x2 := atomic.LoadPointer(&x.v)
|
|
if x2 != nil {
|
|
s = *(*[]codecRtidFn)(x2)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (x *atomicRtidFnSlice) store(p []codecRtidFn) {
|
|
atomic.StorePointer(&x.v, unsafe.Pointer(&p))
|
|
}
|
|
|
|
// --------------------------
|
|
type atomicClsErr struct {
|
|
v unsafe.Pointer // *clsErr
|
|
}
|
|
|
|
func (x *atomicClsErr) load() (e clsErr) {
|
|
x2 := (*clsErr)(atomic.LoadPointer(&x.v))
|
|
if x2 != nil {
|
|
e = *x2
|
|
}
|
|
return
|
|
}
|
|
|
|
func (x *atomicClsErr) store(p clsErr) {
|
|
atomic.StorePointer(&x.v, unsafe.Pointer(&p))
|
|
}
|
|
|
|
// --------------------------
|
|
|
|
// to create a reflect.Value for each member field of fauxUnion,
|
|
// we first create a global fauxUnion, and create reflect.Value
|
|
// for them all.
|
|
// This way, we have the flags and type in the reflect.Value.
|
|
// Then, when a reflect.Value is called, we just copy it,
|
|
// update the ptr to the fauxUnion's, and return it.
|
|
|
|
type unsafeDecNakedWrapper struct {
|
|
fauxUnion
|
|
ru, ri, rf, rl, rs, rb, rt reflect.Value // mapping to the primitives above
|
|
}
|
|
|
|
func (n *unsafeDecNakedWrapper) init() {
|
|
n.ru = rv4iptr(&n.u).Elem()
|
|
n.ri = rv4iptr(&n.i).Elem()
|
|
n.rf = rv4iptr(&n.f).Elem()
|
|
n.rl = rv4iptr(&n.l).Elem()
|
|
n.rs = rv4iptr(&n.s).Elem()
|
|
n.rt = rv4iptr(&n.t).Elem()
|
|
n.rb = rv4iptr(&n.b).Elem()
|
|
// n.rr[] = reflect.ValueOf(&n.)
|
|
}
|
|
|
|
var defUnsafeDecNakedWrapper unsafeDecNakedWrapper
|
|
|
|
func init() {
|
|
defUnsafeDecNakedWrapper.init()
|
|
}
|
|
|
|
func (n *fauxUnion) ru() (v reflect.Value) {
|
|
v = defUnsafeDecNakedWrapper.ru
|
|
((*unsafeReflectValue)(unsafe.Pointer(&v))).ptr = unsafe.Pointer(&n.u)
|
|
return
|
|
}
|
|
func (n *fauxUnion) ri() (v reflect.Value) {
|
|
v = defUnsafeDecNakedWrapper.ri
|
|
((*unsafeReflectValue)(unsafe.Pointer(&v))).ptr = unsafe.Pointer(&n.i)
|
|
return
|
|
}
|
|
func (n *fauxUnion) rf() (v reflect.Value) {
|
|
v = defUnsafeDecNakedWrapper.rf
|
|
((*unsafeReflectValue)(unsafe.Pointer(&v))).ptr = unsafe.Pointer(&n.f)
|
|
return
|
|
}
|
|
func (n *fauxUnion) rl() (v reflect.Value) {
|
|
v = defUnsafeDecNakedWrapper.rl
|
|
((*unsafeReflectValue)(unsafe.Pointer(&v))).ptr = unsafe.Pointer(&n.l)
|
|
return
|
|
}
|
|
func (n *fauxUnion) rs() (v reflect.Value) {
|
|
v = defUnsafeDecNakedWrapper.rs
|
|
((*unsafeReflectValue)(unsafe.Pointer(&v))).ptr = unsafe.Pointer(&n.s)
|
|
return
|
|
}
|
|
func (n *fauxUnion) rt() (v reflect.Value) {
|
|
v = defUnsafeDecNakedWrapper.rt
|
|
((*unsafeReflectValue)(unsafe.Pointer(&v))).ptr = unsafe.Pointer(&n.t)
|
|
return
|
|
}
|
|
func (n *fauxUnion) rb() (v reflect.Value) {
|
|
v = defUnsafeDecNakedWrapper.rb
|
|
((*unsafeReflectValue)(unsafe.Pointer(&v))).ptr = unsafe.Pointer(&n.b)
|
|
return
|
|
}
|
|
|
|
// --------------------------
|
|
func rvSetBytes(rv reflect.Value, v []byte) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*[]byte)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetString(rv reflect.Value, v string) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*string)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetBool(rv reflect.Value, v bool) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*bool)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetTime(rv reflect.Value, v time.Time) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*time.Time)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetFloat32(rv reflect.Value, v float32) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*float32)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetFloat64(rv reflect.Value, v float64) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*float64)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetComplex64(rv reflect.Value, v complex64) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*complex64)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetComplex128(rv reflect.Value, v complex128) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*complex128)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetInt(rv reflect.Value, v int) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*int)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetInt8(rv reflect.Value, v int8) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*int8)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetInt16(rv reflect.Value, v int16) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*int16)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetInt32(rv reflect.Value, v int32) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*int32)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetInt64(rv reflect.Value, v int64) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*int64)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetUint(rv reflect.Value, v uint) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*uint)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetUintptr(rv reflect.Value, v uintptr) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*uintptr)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetUint8(rv reflect.Value, v uint8) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*uint8)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetUint16(rv reflect.Value, v uint16) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*uint16)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetUint32(rv reflect.Value, v uint32) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*uint32)(urv.ptr) = v
|
|
}
|
|
|
|
func rvSetUint64(rv reflect.Value, v uint64) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
*(*uint64)(urv.ptr) = v
|
|
}
|
|
|
|
// ----------------
|
|
|
|
// rvSetZero is rv.Set(reflect.Zero(rv.Type()) for all kinds (including reflect.Interface).
|
|
func rvSetZero(rv reflect.Value) {
|
|
rvSetDirectZero(rv)
|
|
}
|
|
|
|
func rvSetIntf(rv reflect.Value, v reflect.Value) {
|
|
rv.Set(v)
|
|
}
|
|
|
|
// rvSetDirect is rv.Set for all kinds except reflect.Interface.
|
|
//
|
|
// Callers MUST not pass a value of kind reflect.Interface, as it may cause unexpected segfaults.
|
|
func rvSetDirect(rv reflect.Value, v reflect.Value) {
|
|
// MARKER: rv.Set for kind reflect.Interface may do a separate allocation if a scalar value.
|
|
// The book-keeping is onerous, so we just do the simple ones where a memmove is sufficient.
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
uv := (*unsafeReflectValue)(unsafe.Pointer(&v))
|
|
if uv.flag&unsafeFlagIndir == 0 {
|
|
*(*unsafe.Pointer)(urv.ptr) = uv.ptr
|
|
} else if uv.ptr == unsafeZeroAddr {
|
|
if urv.ptr != unsafeZeroAddr {
|
|
typedmemclr(urv.typ, urv.ptr)
|
|
}
|
|
} else {
|
|
typedmemmove(urv.typ, urv.ptr, uv.ptr)
|
|
}
|
|
}
|
|
|
|
// rvSetDirectZero is rv.Set(reflect.Zero(rv.Type()) for all kinds except reflect.Interface.
|
|
func rvSetDirectZero(rv reflect.Value) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
if urv.ptr != unsafeZeroAddr {
|
|
typedmemclr(urv.typ, urv.ptr)
|
|
}
|
|
}
|
|
|
|
// rvMakeSlice updates the slice to point to a new array.
|
|
// It copies data from old slice to new slice.
|
|
// It returns set=true iff it updates it, else it just returns a new slice pointing to a newly made array.
|
|
func rvMakeSlice(rv reflect.Value, ti *typeInfo, xlen, xcap int) (_ reflect.Value, set bool) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
ux := (*unsafeSlice)(urv.ptr)
|
|
t := ((*unsafeIntf)(unsafe.Pointer(&ti.elem))).ptr
|
|
s := unsafeSlice{newarray(t, xcap), xlen, xcap}
|
|
if ux.Len > 0 {
|
|
typedslicecopy(t, s, *ux)
|
|
}
|
|
*ux = s
|
|
return rv, true
|
|
}
|
|
|
|
// rvSlice returns a sub-slice of the slice given new lenth,
|
|
// without modifying passed in value.
|
|
// It is typically called when we know that SetLen(...) cannot be done.
|
|
func rvSlice(rv reflect.Value, length int) reflect.Value {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
var x []struct{}
|
|
ux := (*unsafeSlice)(unsafe.Pointer(&x))
|
|
*ux = *(*unsafeSlice)(urv.ptr)
|
|
ux.Len = length
|
|
urv.ptr = unsafe.Pointer(ux)
|
|
return rv
|
|
}
|
|
|
|
// rcGrowSlice updates the slice to point to a new array with the cap incremented, and len set to the new cap value.
|
|
// It copies data from old slice to new slice.
|
|
// It returns set=true iff it updates it, else it just returns a new slice pointing to a newly made array.
|
|
func rvGrowSlice(rv reflect.Value, ti *typeInfo, cap, incr int) (v reflect.Value, newcap int, set bool) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
ux := (*unsafeSlice)(urv.ptr)
|
|
t := ((*unsafeIntf)(unsafe.Pointer(&ti.elem))).ptr
|
|
*ux = unsafeGrowslice(t, *ux, cap, incr)
|
|
ux.Len = ux.Cap
|
|
return rv, ux.Cap, true
|
|
}
|
|
|
|
// ------------
|
|
|
|
func rvSliceIndex(rv reflect.Value, i int, ti *typeInfo) (v reflect.Value) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
uv := (*unsafeReflectValue)(unsafe.Pointer(&v))
|
|
uv.ptr = unsafe.Pointer(uintptr(((*unsafeSlice)(urv.ptr)).Data) + uintptr(int(ti.elemsize)*i))
|
|
uv.typ = ((*unsafeIntf)(unsafe.Pointer(&ti.elem))).ptr
|
|
uv.flag = uintptr(ti.elemkind) | unsafeFlagIndir | unsafeFlagAddr
|
|
return
|
|
}
|
|
|
|
func rvSliceZeroCap(t reflect.Type) (v reflect.Value) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&v))
|
|
urv.typ = ((*unsafeIntf)(unsafe.Pointer(&t))).ptr
|
|
urv.flag = uintptr(reflect.Slice) | unsafeFlagIndir
|
|
urv.ptr = unsafe.Pointer(&unsafeZeroSlice)
|
|
return
|
|
}
|
|
|
|
func rvLenSlice(rv reflect.Value) int {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return (*unsafeSlice)(urv.ptr).Len
|
|
}
|
|
|
|
func rvCapSlice(rv reflect.Value) int {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return (*unsafeSlice)(urv.ptr).Cap
|
|
}
|
|
|
|
func rvArrayIndex(rv reflect.Value, i int, ti *typeInfo) (v reflect.Value) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
uv := (*unsafeReflectValue)(unsafe.Pointer(&v))
|
|
uv.ptr = unsafe.Pointer(uintptr(urv.ptr) + uintptr(int(ti.elemsize)*i))
|
|
uv.typ = ((*unsafeIntf)(unsafe.Pointer(&ti.elem))).ptr
|
|
uv.flag = uintptr(ti.elemkind) | unsafeFlagIndir | unsafeFlagAddr
|
|
return
|
|
}
|
|
|
|
// if scratch is nil, then return a writable view (assuming canAddr=true)
|
|
func rvGetArrayBytes(rv reflect.Value, scratch []byte) (bs []byte) {
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
bx := (*unsafeSlice)(unsafe.Pointer(&bs))
|
|
bx.Data = urv.ptr
|
|
bx.Len = rv.Len()
|
|
bx.Cap = bx.Len
|
|
return
|
|
}
|
|
|
|
func rvGetArray4Slice(rv reflect.Value) (v reflect.Value) {
|
|
// It is possible that this slice is based off an array with a larger
|
|
// len that we want (where array len == slice cap).
|
|
// However, it is ok to create an array type that is a subset of the full
|
|
// e.g. full slice is based off a *[16]byte, but we can create a *[4]byte
|
|
// off of it. That is ok.
|
|
//
|
|
// Consequently, we use rvLenSlice, not rvCapSlice.
|
|
|
|
t := reflectArrayOf(rvLenSlice(rv), rv.Type().Elem())
|
|
// v = rvZeroAddrK(t, reflect.Array)
|
|
|
|
uv := (*unsafeReflectValue)(unsafe.Pointer(&v))
|
|
uv.flag = uintptr(reflect.Array) | unsafeFlagIndir | unsafeFlagAddr
|
|
uv.typ = ((*unsafeIntf)(unsafe.Pointer(&t))).ptr
|
|
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
uv.ptr = *(*unsafe.Pointer)(urv.ptr) // slice rv has a ptr to the slice.
|
|
|
|
return
|
|
}
|
|
|
|
func rvGetSlice4Array(rv reflect.Value, v interface{}) {
|
|
// v is a pointer to a slice to be populated
|
|
uv := (*unsafeIntf)(unsafe.Pointer(&v))
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
|
|
s := (*unsafeSlice)(uv.ptr)
|
|
s.Data = urv.ptr
|
|
s.Len = rv.Len()
|
|
s.Cap = s.Len
|
|
}
|
|
|
|
func rvCopySlice(dest, src reflect.Value, elemType reflect.Type) {
|
|
typedslicecopy((*unsafeIntf)(unsafe.Pointer(&elemType)).ptr,
|
|
*(*unsafeSlice)((*unsafeReflectValue)(unsafe.Pointer(&dest)).ptr),
|
|
*(*unsafeSlice)((*unsafeReflectValue)(unsafe.Pointer(&src)).ptr))
|
|
}
|
|
|
|
// ------------
|
|
|
|
func rvGetBool(rv reflect.Value) bool {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*bool)(v.ptr)
|
|
}
|
|
|
|
func rvGetBytes(rv reflect.Value) []byte {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*[]byte)(v.ptr)
|
|
}
|
|
|
|
func rvGetTime(rv reflect.Value) time.Time {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*time.Time)(v.ptr)
|
|
}
|
|
|
|
func rvGetString(rv reflect.Value) string {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*string)(v.ptr)
|
|
}
|
|
|
|
func rvGetFloat64(rv reflect.Value) float64 {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*float64)(v.ptr)
|
|
}
|
|
|
|
func rvGetFloat32(rv reflect.Value) float32 {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*float32)(v.ptr)
|
|
}
|
|
|
|
func rvGetComplex64(rv reflect.Value) complex64 {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*complex64)(v.ptr)
|
|
}
|
|
|
|
func rvGetComplex128(rv reflect.Value) complex128 {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*complex128)(v.ptr)
|
|
}
|
|
|
|
func rvGetInt(rv reflect.Value) int {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*int)(v.ptr)
|
|
}
|
|
|
|
func rvGetInt8(rv reflect.Value) int8 {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*int8)(v.ptr)
|
|
}
|
|
|
|
func rvGetInt16(rv reflect.Value) int16 {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*int16)(v.ptr)
|
|
}
|
|
|
|
func rvGetInt32(rv reflect.Value) int32 {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*int32)(v.ptr)
|
|
}
|
|
|
|
func rvGetInt64(rv reflect.Value) int64 {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*int64)(v.ptr)
|
|
}
|
|
|
|
func rvGetUint(rv reflect.Value) uint {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*uint)(v.ptr)
|
|
}
|
|
|
|
func rvGetUint8(rv reflect.Value) uint8 {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*uint8)(v.ptr)
|
|
}
|
|
|
|
func rvGetUint16(rv reflect.Value) uint16 {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*uint16)(v.ptr)
|
|
}
|
|
|
|
func rvGetUint32(rv reflect.Value) uint32 {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*uint32)(v.ptr)
|
|
}
|
|
|
|
func rvGetUint64(rv reflect.Value) uint64 {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*uint64)(v.ptr)
|
|
}
|
|
|
|
func rvGetUintptr(rv reflect.Value) uintptr {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
return *(*uintptr)(v.ptr)
|
|
}
|
|
|
|
func rvLenMap(rv reflect.Value) int {
|
|
// maplen is not inlined, because as of go1.16beta, go:linkname's are not inlined.
|
|
// thus, faster to call rv.Len() directly.
|
|
//
|
|
// MARKER: review after https://github.com/golang/go/issues/20019 fixed.
|
|
|
|
// return rv.Len()
|
|
|
|
return len_map(rvRefPtr((*unsafeReflectValue)(unsafe.Pointer(&rv))))
|
|
}
|
|
|
|
// copy is an intrinsic, which may use asm if length is small,
|
|
// or make a runtime call to runtime.memmove if length is large.
|
|
// Performance suffers when you always call runtime.memmove function.
|
|
//
|
|
// Consequently, there's no value in a copybytes call - just call copy() directly
|
|
|
|
// func copybytes(to, from []byte) (n int) {
|
|
// n = (*unsafeSlice)(unsafe.Pointer(&from)).Len
|
|
// memmove(
|
|
// (*unsafeSlice)(unsafe.Pointer(&to)).Data,
|
|
// (*unsafeSlice)(unsafe.Pointer(&from)).Data,
|
|
// uintptr(n),
|
|
// )
|
|
// return
|
|
// }
|
|
|
|
// func copybytestr(to []byte, from string) (n int) {
|
|
// n = (*unsafeSlice)(unsafe.Pointer(&from)).Len
|
|
// memmove(
|
|
// (*unsafeSlice)(unsafe.Pointer(&to)).Data,
|
|
// (*unsafeSlice)(unsafe.Pointer(&from)).Data,
|
|
// uintptr(n),
|
|
// )
|
|
// return
|
|
// }
|
|
|
|
// Note: it is hard to find len(...) of an array type,
|
|
// as that is a field in the arrayType representing the array, and hard to introspect.
|
|
//
|
|
// func rvLenArray(rv reflect.Value) int { return rv.Len() }
|
|
|
|
// ------------ map range and map indexing ----------
|
|
|
|
// regular calls to map via reflection: MapKeys, MapIndex, MapRange/MapIter etc
|
|
// will always allocate for each map key or value.
|
|
//
|
|
// It is more performant to provide a value that the map entry is set into,
|
|
// and that elides the allocation.
|
|
|
|
// go 1.4+ has runtime/hashmap.go or runtime/map.go which has a
|
|
// hIter struct with the first 2 values being key and value
|
|
// of the current iteration.
|
|
//
|
|
// This *hIter is passed to mapiterinit, mapiternext, mapiterkey, mapiterelem.
|
|
// We bypass the reflect wrapper functions and just use the *hIter directly.
|
|
//
|
|
// Though *hIter has many fields, we only care about the first 2.
|
|
//
|
|
// We directly embed this in unsafeMapIter below
|
|
//
|
|
// hiter is typically about 12 words, but we just fill up unsafeMapIter to 32 words,
|
|
// so it fills multiple cache lines and can give some extra space to accomodate small growth.
|
|
|
|
type unsafeMapIter struct {
|
|
mtyp, mptr unsafe.Pointer
|
|
k, v reflect.Value
|
|
kisref bool
|
|
visref bool
|
|
mapvalues bool
|
|
done bool
|
|
started bool
|
|
_ [3]byte // padding
|
|
it struct {
|
|
key unsafe.Pointer
|
|
value unsafe.Pointer
|
|
_ [20]uintptr // padding for other fields (to make up 32 words for enclosing struct)
|
|
}
|
|
}
|
|
|
|
func (t *unsafeMapIter) Next() (r bool) {
|
|
if t == nil || t.done {
|
|
return
|
|
}
|
|
if t.started {
|
|
mapiternext((unsafe.Pointer)(&t.it))
|
|
} else {
|
|
t.started = true
|
|
}
|
|
|
|
t.done = t.it.key == nil
|
|
if t.done {
|
|
return
|
|
}
|
|
|
|
if helperUnsafeDirectAssignMapEntry || t.kisref {
|
|
(*unsafeReflectValue)(unsafe.Pointer(&t.k)).ptr = t.it.key
|
|
} else {
|
|
k := (*unsafeReflectValue)(unsafe.Pointer(&t.k))
|
|
typedmemmove(k.typ, k.ptr, t.it.key)
|
|
}
|
|
|
|
if t.mapvalues {
|
|
if helperUnsafeDirectAssignMapEntry || t.visref {
|
|
(*unsafeReflectValue)(unsafe.Pointer(&t.v)).ptr = t.it.value
|
|
} else {
|
|
v := (*unsafeReflectValue)(unsafe.Pointer(&t.v))
|
|
typedmemmove(v.typ, v.ptr, t.it.value)
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func (t *unsafeMapIter) Key() (r reflect.Value) {
|
|
return t.k
|
|
}
|
|
|
|
func (t *unsafeMapIter) Value() (r reflect.Value) {
|
|
return t.v
|
|
}
|
|
|
|
func (t *unsafeMapIter) Done() {}
|
|
|
|
type mapIter struct {
|
|
unsafeMapIter
|
|
}
|
|
|
|
func mapRange(t *mapIter, m, k, v reflect.Value, mapvalues bool) {
|
|
if rvIsNil(m) {
|
|
t.done = true
|
|
return
|
|
}
|
|
t.done = false
|
|
t.started = false
|
|
t.mapvalues = mapvalues
|
|
|
|
// var urv *unsafeReflectValue
|
|
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&m))
|
|
t.mtyp = urv.typ
|
|
t.mptr = rvRefPtr(urv)
|
|
|
|
// t.it = (*unsafeMapHashIter)(reflect_mapiterinit(t.mtyp, t.mptr))
|
|
mapiterinit(t.mtyp, t.mptr, unsafe.Pointer(&t.it))
|
|
|
|
t.k = k
|
|
t.kisref = refBitset.isset(byte(k.Kind()))
|
|
|
|
if mapvalues {
|
|
t.v = v
|
|
t.visref = refBitset.isset(byte(v.Kind()))
|
|
} else {
|
|
t.v = reflect.Value{}
|
|
}
|
|
}
|
|
|
|
// unsafeMapKVPtr returns the pointer if flagIndir, else it returns a pointer to the pointer.
|
|
// It is needed as maps always keep a reference to the underlying value.
|
|
func unsafeMapKVPtr(urv *unsafeReflectValue) unsafe.Pointer {
|
|
if urv.flag&unsafeFlagIndir == 0 {
|
|
return unsafe.Pointer(&urv.ptr)
|
|
}
|
|
return urv.ptr
|
|
}
|
|
|
|
// func mapDelete(m, k reflect.Value) {
|
|
// var urv = (*unsafeReflectValue)(unsafe.Pointer(&k))
|
|
// var kptr = unsafeMapKVPtr(urv)
|
|
// urv = (*unsafeReflectValue)(unsafe.Pointer(&m))
|
|
// mapdelete(urv.typ, rv2ptr(urv), kptr)
|
|
// }
|
|
|
|
// return an addressable reflect value that can be used in mapRange and mapGet operations.
|
|
//
|
|
// all calls to mapGet or mapRange will call here to get an addressable reflect.Value.
|
|
func mapAddrLoopvarRV(t reflect.Type, k reflect.Kind) (rv reflect.Value) {
|
|
// return rvZeroAddrK(t, k)
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
urv.flag = uintptr(k) | unsafeFlagIndir | unsafeFlagAddr
|
|
urv.typ = ((*unsafeIntf)(unsafe.Pointer(&t))).ptr
|
|
// since we always set the ptr when helperUnsafeDirectAssignMapEntry=true,
|
|
// we should only allocate if it is not true
|
|
if !helperUnsafeDirectAssignMapEntry {
|
|
urv.ptr = unsafeNew(urv.typ)
|
|
}
|
|
return
|
|
}
|
|
|
|
// ---------- ENCODER optimized ---------------
|
|
|
|
func (e *Encoder) jsondriver() *jsonEncDriver {
|
|
return (*jsonEncDriver)((*unsafeIntf)(unsafe.Pointer(&e.e)).ptr)
|
|
}
|
|
|
|
func (d *Decoder) zerocopystate() bool {
|
|
return d.decByteState == decByteStateZerocopy && d.h.ZeroCopy
|
|
}
|
|
|
|
func (d *Decoder) stringZC(v []byte) (s string) {
|
|
// MARKER: inline zerocopystate directly so genHelper forwarding function fits within inlining cost
|
|
|
|
// if d.zerocopystate() {
|
|
if d.decByteState == decByteStateZerocopy && d.h.ZeroCopy {
|
|
return stringView(v)
|
|
}
|
|
return d.string(v)
|
|
}
|
|
|
|
func (d *Decoder) mapKeyString(callFnRvk *bool, kstrbs, kstr2bs *[]byte) string {
|
|
if !d.zerocopystate() {
|
|
*callFnRvk = true
|
|
if d.decByteState == decByteStateReuseBuf {
|
|
*kstrbs = append((*kstrbs)[:0], (*kstr2bs)...)
|
|
*kstr2bs = *kstrbs
|
|
}
|
|
}
|
|
return stringView(*kstr2bs)
|
|
}
|
|
|
|
// ---------- DECODER optimized ---------------
|
|
|
|
func (d *Decoder) jsondriver() *jsonDecDriver {
|
|
return (*jsonDecDriver)((*unsafeIntf)(unsafe.Pointer(&d.d)).ptr)
|
|
}
|
|
|
|
// ---------- structFieldInfo optimized ---------------
|
|
|
|
func (n *structFieldInfoPathNode) rvField(v reflect.Value) (rv reflect.Value) {
|
|
// we already know this is exported, and maybe embedded (based on what si says)
|
|
uv := (*unsafeReflectValue)(unsafe.Pointer(&v))
|
|
urv := (*unsafeReflectValue)(unsafe.Pointer(&rv))
|
|
// clear flagEmbedRO if necessary, and inherit permission bits from v
|
|
urv.flag = uv.flag&(unsafeFlagStickyRO|unsafeFlagIndir|unsafeFlagAddr) | uintptr(n.kind)
|
|
urv.typ = ((*unsafeIntf)(unsafe.Pointer(&n.typ))).ptr
|
|
urv.ptr = unsafe.Pointer(uintptr(uv.ptr) + uintptr(n.offset))
|
|
return
|
|
}
|
|
|
|
// runtime chan and map are designed such that the first field is the count.
|
|
// len builtin uses this to get the length of a chan/map easily.
|
|
// leverage this knowledge, since maplen and chanlen functions from runtime package
|
|
// are go:linkname'd here, and thus not inlined as of go1.16beta
|
|
|
|
func len_map_chan(m unsafe.Pointer) int {
|
|
if m == nil {
|
|
return 0
|
|
}
|
|
return *((*int)(m))
|
|
}
|
|
|
|
func len_map(m unsafe.Pointer) int {
|
|
// return maplen(m)
|
|
return len_map_chan(m)
|
|
}
|
|
func len_chan(m unsafe.Pointer) int {
|
|
// return chanlen(m)
|
|
return len_map_chan(m)
|
|
}
|
|
|
|
func unsafeNew(typ unsafe.Pointer) unsafe.Pointer {
|
|
return mallocgc(rtsize2(typ), typ, true)
|
|
}
|
|
|
|
// ---------- go linknames (LINKED to runtime/reflect) ---------------
|
|
|
|
// MARKER: always check that these linknames match subsequent versions of go
|
|
//
|
|
// Note that as of Jan 2021 (go 1.16 release), go:linkname(s) are not inlined
|
|
// outside of the standard library use (e.g. within sync, reflect, etc).
|
|
// If these link'ed functions were normally inlined, calling them here would
|
|
// not necessarily give a performance boost, due to function overhead.
|
|
//
|
|
// However, it seems most of these functions are not inlined anyway,
|
|
// as only maplen, chanlen and mapaccess are small enough to get inlined.
|
|
//
|
|
// We checked this by going into $GOROOT/src/runtime and running:
|
|
// $ go build -tags codec.notfastpath -gcflags "-m=2"
|
|
|
|
// reflect.{unsafe_New, unsafe_NewArray} are not supported in gollvm,
|
|
// failing with "error: undefined reference" error.
|
|
// however, runtime.{mallocgc, newarray} are supported, so use that instead.
|
|
|
|
//go:linkname memmove runtime.memmove
|
|
//go:noescape
|
|
func memmove(to, from unsafe.Pointer, n uintptr)
|
|
|
|
//go:linkname mallocgc runtime.mallocgc
|
|
//go:noescape
|
|
func mallocgc(size uintptr, typ unsafe.Pointer, needzero bool) unsafe.Pointer
|
|
|
|
//go:linkname newarray runtime.newarray
|
|
//go:noescape
|
|
func newarray(typ unsafe.Pointer, n int) unsafe.Pointer
|
|
|
|
//go:linkname mapiterinit runtime.mapiterinit
|
|
//go:noescape
|
|
func mapiterinit(typ unsafe.Pointer, m unsafe.Pointer, it unsafe.Pointer)
|
|
|
|
//go:linkname mapiternext runtime.mapiternext
|
|
//go:noescape
|
|
func mapiternext(it unsafe.Pointer) (key unsafe.Pointer)
|
|
|
|
//go:linkname mapdelete runtime.mapdelete
|
|
//go:noescape
|
|
func mapdelete(typ unsafe.Pointer, m unsafe.Pointer, key unsafe.Pointer)
|
|
|
|
//go:linkname mapassign runtime.mapassign
|
|
//go:noescape
|
|
func mapassign(typ unsafe.Pointer, m unsafe.Pointer, key unsafe.Pointer) unsafe.Pointer
|
|
|
|
//go:linkname mapaccess2 runtime.mapaccess2
|
|
//go:noescape
|
|
func mapaccess2(typ unsafe.Pointer, m unsafe.Pointer, key unsafe.Pointer) (val unsafe.Pointer, ok bool)
|
|
|
|
// reflect.typed{memmove, memclr, slicecopy} will handle checking if the type has pointers or not,
|
|
// and if a writeBarrier is needed, before delegating to the right method in the runtime.
|
|
//
|
|
// This is why we use the functions in reflect, and not the ones in runtime directly.
|
|
// Calling runtime.XXX here will lead to memory issues.
|
|
|
|
//go:linkname typedslicecopy reflect.typedslicecopy
|
|
//go:noescape
|
|
func typedslicecopy(elemType unsafe.Pointer, dst, src unsafeSlice) int
|
|
|
|
//go:linkname typedmemmove reflect.typedmemmove
|
|
//go:noescape
|
|
func typedmemmove(typ unsafe.Pointer, dst, src unsafe.Pointer)
|
|
|
|
//go:linkname typedmemclr reflect.typedmemclr
|
|
//go:noescape
|
|
func typedmemclr(typ unsafe.Pointer, dst unsafe.Pointer)
|