github.com/3JoB/go-json@v0.10.4/internal/decoder/compile_norace.go (about)

     1  //go:build !race
     2  // +build !race
     3  
     4  package decoder
     5  
     6  import (
     7  	"unsafe"
     8  
     9  	"github.com/3JoB/go-json/internal/runtime"
    10  )
    11  
    12  func CompileToGetDecoder(typ *runtime.Type) (Decoder, error) {
    13  	typeptr := uintptr(unsafe.Pointer(typ))
    14  	if typeptr > typeAddr.MaxTypeAddr {
    15  		return compileToGetDecoderSlowPath(typeptr, typ)
    16  	}
    17  
    18  	index := (typeptr - typeAddr.BaseTypeAddr) >> typeAddr.AddrShift
    19  	if dec := cachedDecoder[index]; dec != nil {
    20  		return dec, nil
    21  	}
    22  
    23  	dec, err := compileHead(typ, map[uintptr]Decoder{})
    24  	if err != nil {
    25  		return nil, err
    26  	}
    27  	cachedDecoder[index] = dec
    28  	return dec, nil
    29  }