diff options
Diffstat (limited to 'vendor/github.com/bytedance/sonic/internal/rt/gcwb.go')
| -rw-r--r-- | vendor/github.com/bytedance/sonic/internal/rt/gcwb.go | 85 |
1 files changed, 0 insertions, 85 deletions
diff --git a/vendor/github.com/bytedance/sonic/internal/rt/gcwb.go b/vendor/github.com/bytedance/sonic/internal/rt/gcwb.go deleted file mode 100644 index c9ad5fb2f..000000000 --- a/vendor/github.com/bytedance/sonic/internal/rt/gcwb.go +++ /dev/null @@ -1,85 +0,0 @@ -// +build go1.21,!go1.26 - -/* - * Copyright 2021 ByteDance Inc. - * - * 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 rt - -import ( - `sync/atomic` - `unsafe` - - `golang.org/x/arch/x86/x86asm` -) - -//go:linkname GcWriteBarrier2 runtime.gcWriteBarrier2 -func GcWriteBarrier2() - -//go:linkname RuntimeWriteBarrier runtime.writeBarrier -var RuntimeWriteBarrier uintptr - -const ( - _MaxInstr = 15 -) - -func isvar(arg x86asm.Arg) bool { - v, ok := arg.(x86asm.Mem) - return ok && v.Base == x86asm.RIP -} - -func iszero(arg x86asm.Arg) bool { - v, ok := arg.(x86asm.Imm) - return ok && v == 0 -} - -func GcwbAddr() uintptr { - var err error - var off uintptr - var ins x86asm.Inst - - /* get the function address */ - pc := uintptr(0) - fp := FuncAddr(atomic.StorePointer) - - /* search within the first 16 instructions */ - for i := 0; i < 16; i++ { - mem := unsafe.Pointer(uintptr(fp) + pc) - buf := BytesFrom(mem, _MaxInstr, _MaxInstr) - - /* disassemble the instruction */ - if ins, err = x86asm.Decode(buf, 64); err != nil { - panic("gcwbaddr: " + err.Error()) - } - - /* check for a byte comparison with zero */ - if ins.Op == x86asm.CMP && ins.MemBytes == 1 && isvar(ins.Args[0]) && iszero(ins.Args[1]) { - off = pc + uintptr(ins.Len) + uintptr(ins.Args[0].(x86asm.Mem).Disp) - break - } - - /* move to next instruction */ - nb := ins.Len - pc += uintptr(nb) - } - - /* check for address */ - if off == 0 { - panic("gcwbaddr: could not locate the variable `writeBarrier`") - } else { - return uintptr(fp) + off - } -} - |
