github.com/cloudwego/frugal@v0.1.15/internal/binary/encoder/linker_emu.go (about)

     1  /*
     2   * Copyright 2022 ByteDance Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package encoder
    18  
    19  import (
    20      `unsafe`
    21  
    22      `github.com/cloudwego/frugal/internal/atm/emu`
    23      `github.com/cloudwego/frugal/internal/atm/hir`
    24      `github.com/cloudwego/frugal/internal/rt`
    25      `github.com/cloudwego/frugal/iov`
    26  )
    27  
    28  func link_emu(prog hir.Program) Encoder {
    29      return func(buf unsafe.Pointer, len int, mem iov.BufferWriter, p unsafe.Pointer, rs *RuntimeState, st int) (ret int, err error) {
    30          ctx := emu.LoadProgram(prog)
    31          exc := (*rt.GoIface)(unsafe.Pointer(&err))
    32          iop := (*rt.GoIface)(unsafe.Pointer(&mem))
    33          ctx.Ap(0,buf)
    34          ctx.Au(1, uint64(len))
    35          ctx.Ap(2, unsafe.Pointer(iop.Itab))
    36          ctx.Ap(3, iop.Value)
    37          ctx.Ap(4, p)
    38          ctx.Ap(5, unsafe.Pointer(rs))
    39          ctx.Au(6, uint64(st))
    40          ctx.Run()
    41          ret = int(ctx.Ru(0))
    42          exc.Itab = (*rt.GoItab)(ctx.Rp(1))
    43          exc.Value = ctx.Rp(2)
    44          ctx.Free()
    45          return
    46      }
    47  }
    48  
    49  func emu_wbuf(ctx hir.CallContext, i int) (v iov.BufferWriter) {
    50      (*rt.GoIface)(unsafe.Pointer(&v)).Itab = (*rt.GoItab)(ctx.Ap(i))
    51      (*rt.GoIface)(unsafe.Pointer(&v)).Value = ctx.Ap(i + 1)
    52      return
    53  }
    54  
    55  func emu_setret(ctx hir.CallContext) func(int, error) {
    56      return func(ret int, err error) {
    57          vv := (*rt.GoIface)(unsafe.Pointer(&err))
    58          ctx.Ru(0, uint64(ret))
    59          ctx.Rp(1, unsafe.Pointer(vv.Itab))
    60          ctx.Rp(2, vv.Value)
    61      }
    62  }
    63  
    64  func emu_encode(ctx hir.CallContext) (int, error) {
    65      return encode(
    66          (*rt.GoType)(ctx.Ap(0)),
    67          ctx.Ap(1),
    68          int(ctx.Au(2)),
    69          emu_wbuf(ctx, 3),
    70          ctx.Ap(5),
    71          (*RuntimeState)(ctx.Ap(6)),
    72          int(ctx.Au(7)),
    73      )
    74  }
    75  
    76  func emu_gcall_encode(ctx hir.CallContext) {
    77      if !ctx.Verify("**i****i", "i**") {
    78          panic("invalid encode call")
    79      } else {
    80          emu_setret(ctx)(emu_encode(ctx))
    81      }
    82  }