forked from mirror/go-json
498 lines
12 KiB
Go
498 lines
12 KiB
Go
package json
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import (
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"fmt"
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"strings"
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"unsafe"
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)
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const uintptrSize = 4 << (^uintptr(0) >> 63) // unsafe.Sizeof(uintptr(0)) but an ideal const
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type opcode struct {
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op opType // operation type
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typ *rtype // go type
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displayIdx int // opcode index
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key []byte // struct field key
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escapedKey []byte // struct field key ( HTML escaped )
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ptrNum int // pointer number: e.g. double pointer is 2.
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displayKey string // key text to display
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isTaggedKey bool // whether tagged key
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anonymousKey bool // whether anonymous key
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root bool // whether root
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indent int // indent number
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idx uintptr // offset to access ptr
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headIdx uintptr // offset to access slice/struct head
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elemIdx uintptr // offset to access array/slice/map elem
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length uintptr // offset to access slice/map length or array length
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mapIter uintptr // offset to access map iterator
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mapPos uintptr // offset to access position list for sorted map
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offset uintptr // offset size from struct header
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size uintptr // array/slice elem size
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mapKey *opcode // map key
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mapValue *opcode // map value
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elem *opcode // array/slice elem
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end *opcode // array/slice/struct/map end
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prevField *opcode // prev struct field
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nextField *opcode // next struct field
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next *opcode // next opcode
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jmp *compiledCode // for recursive call
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}
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func newOpCode(ctx *encodeCompileContext, op opType) *opcode {
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return newOpCodeWithNext(ctx, op, newEndOp(ctx))
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}
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func opcodeOffset(idx int) uintptr {
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return uintptr(idx) * uintptrSize
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}
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func copyOpcode(code *opcode) *opcode {
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codeMap := map[uintptr]*opcode{}
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return code.copy(codeMap)
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}
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func newOpCodeWithNext(ctx *encodeCompileContext, op opType, next *opcode) *opcode {
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return &opcode{
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op: op,
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typ: ctx.typ,
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displayIdx: ctx.opcodeIndex,
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indent: ctx.indent,
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idx: opcodeOffset(ctx.ptrIndex),
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next: next,
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}
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}
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func newEndOp(ctx *encodeCompileContext) *opcode {
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return newOpCodeWithNext(ctx, opEnd, nil)
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}
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func (c *opcode) copy(codeMap map[uintptr]*opcode) *opcode {
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if c == nil {
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return nil
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}
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addr := uintptr(unsafe.Pointer(c))
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if code, exists := codeMap[addr]; exists {
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return code
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}
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copied := &opcode{
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op: c.op,
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typ: c.typ,
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displayIdx: c.displayIdx,
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key: c.key,
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escapedKey: c.escapedKey,
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displayKey: c.displayKey,
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ptrNum: c.ptrNum,
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isTaggedKey: c.isTaggedKey,
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anonymousKey: c.anonymousKey,
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root: c.root,
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indent: c.indent,
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idx: c.idx,
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headIdx: c.headIdx,
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elemIdx: c.elemIdx,
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length: c.length,
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mapIter: c.mapIter,
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mapPos: c.mapPos,
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offset: c.offset,
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size: c.size,
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}
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codeMap[addr] = copied
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copied.mapKey = c.mapKey.copy(codeMap)
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copied.mapValue = c.mapValue.copy(codeMap)
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copied.elem = c.elem.copy(codeMap)
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copied.end = c.end.copy(codeMap)
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copied.prevField = c.prevField.copy(codeMap)
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copied.nextField = c.nextField.copy(codeMap)
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copied.next = c.next.copy(codeMap)
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copied.jmp = c.jmp
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return copied
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}
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func (c *opcode) beforeLastCode() *opcode {
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code := c
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for {
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var nextCode *opcode
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switch code.op.codeType() {
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case codeArrayElem, codeSliceElem, codeMapKey:
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nextCode = code.end
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default:
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nextCode = code.next
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}
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if nextCode.op == opEnd {
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return code
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}
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code = nextCode
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}
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return nil
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}
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func (c *opcode) totalLength() int {
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var idx int
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for code := c; code.op != opEnd; {
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idx = int(code.idx / uintptrSize)
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if code.op == opStructFieldRecursiveEnd {
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break
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}
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switch code.op.codeType() {
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case codeArrayElem, codeSliceElem, codeMapKey:
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code = code.end
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default:
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code = code.next
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}
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}
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return idx + 2 // opEnd + 1
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}
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func (c *opcode) decOpcodeIndex() {
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for code := c; code.op != opEnd; {
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code.displayIdx--
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code.idx -= uintptrSize
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if code.headIdx > 0 {
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code.headIdx -= uintptrSize
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}
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if code.elemIdx > 0 {
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code.elemIdx -= uintptrSize
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}
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if code.mapIter > 0 {
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code.mapIter -= uintptrSize
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}
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if code.length > 0 && code.op.codeType() != codeArrayHead && code.op.codeType() != codeArrayElem {
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code.length -= uintptrSize
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}
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switch code.op.codeType() {
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case codeArrayElem, codeSliceElem, codeMapKey:
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code = code.end
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default:
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code = code.next
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}
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}
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}
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func (c *opcode) dumpHead(code *opcode) string {
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var length uintptr
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if code.op.codeType() == codeArrayHead {
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length = code.length
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} else {
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length = code.length / uintptrSize
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}
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return fmt.Sprintf(
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`[%d]%s%s ([idx:%d][headIdx:%d][elemIdx:%d][length:%d])`,
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code.displayIdx,
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strings.Repeat("-", code.indent),
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code.op,
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code.idx/uintptrSize,
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code.headIdx/uintptrSize,
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code.elemIdx/uintptrSize,
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length,
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)
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}
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func (c *opcode) dumpMapHead(code *opcode) string {
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return fmt.Sprintf(
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`[%d]%s%s ([idx:%d][headIdx:%d][elemIdx:%d][length:%d][mapIter:%d])`,
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code.displayIdx,
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strings.Repeat("-", code.indent),
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code.op,
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code.idx/uintptrSize,
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code.headIdx/uintptrSize,
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code.elemIdx/uintptrSize,
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code.length/uintptrSize,
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code.mapIter/uintptrSize,
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)
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}
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func (c *opcode) dumpMapEnd(code *opcode) string {
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return fmt.Sprintf(
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`[%d]%s%s ([idx:%d][mapPos:%d][length:%d])`,
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code.displayIdx,
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strings.Repeat("-", code.indent),
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code.op,
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code.idx/uintptrSize,
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code.mapPos/uintptrSize,
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code.length/uintptrSize,
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)
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}
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func (c *opcode) dumpElem(code *opcode) string {
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var length uintptr
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if code.op.codeType() == codeArrayElem {
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length = code.length
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} else {
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length = code.length / uintptrSize
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}
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return fmt.Sprintf(
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`[%d]%s%s ([idx:%d][headIdx:%d][elemIdx:%d][length:%d][size:%d])`,
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code.displayIdx,
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strings.Repeat("-", code.indent),
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code.op,
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code.idx/uintptrSize,
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code.headIdx/uintptrSize,
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code.elemIdx/uintptrSize,
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length,
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code.size,
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)
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}
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func (c *opcode) dumpField(code *opcode) string {
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return fmt.Sprintf(
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`[%d]%s%s ([idx:%d][key:%s][offset:%d][headIdx:%d])`,
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code.displayIdx,
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strings.Repeat("-", code.indent),
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code.op,
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code.idx/uintptrSize,
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code.displayKey,
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code.offset,
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code.headIdx/uintptrSize,
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)
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}
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func (c *opcode) dumpKey(code *opcode) string {
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return fmt.Sprintf(
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`[%d]%s%s ([idx:%d][elemIdx:%d][length:%d][mapIter:%d])`,
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code.displayIdx,
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strings.Repeat("-", code.indent),
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code.op,
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code.idx/uintptrSize,
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code.elemIdx/uintptrSize,
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code.length/uintptrSize,
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code.mapIter/uintptrSize,
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)
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}
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func (c *opcode) dumpValue(code *opcode) string {
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return fmt.Sprintf(
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`[%d]%s%s ([idx:%d][mapIter:%d])`,
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code.displayIdx,
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strings.Repeat("-", code.indent),
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code.op,
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code.idx/uintptrSize,
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code.mapIter/uintptrSize,
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)
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}
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func (c *opcode) dump() string {
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codes := []string{}
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for code := c; code.op != opEnd; {
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switch code.op.codeType() {
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case codeSliceHead:
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codes = append(codes, c.dumpHead(code))
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code = code.next
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case codeMapHead:
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codes = append(codes, c.dumpMapHead(code))
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code = code.next
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case codeArrayElem, codeSliceElem:
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codes = append(codes, c.dumpElem(code))
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code = code.end
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case codeMapKey:
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codes = append(codes, c.dumpKey(code))
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code = code.end
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case codeMapValue:
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codes = append(codes, c.dumpValue(code))
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code = code.next
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case codeMapEnd:
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codes = append(codes, c.dumpMapEnd(code))
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code = code.next
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case codeStructField:
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codes = append(codes, c.dumpField(code))
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code = code.next
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case codeStructEnd:
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codes = append(codes, c.dumpField(code))
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code = code.next
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default:
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codes = append(codes, fmt.Sprintf(
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"[%d]%s%s ([idx:%d])",
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code.displayIdx,
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strings.Repeat("-", code.indent),
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code.op,
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code.idx/uintptrSize,
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))
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code = code.next
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}
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}
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return strings.Join(codes, "\n")
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}
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func prevField(code *opcode, removedFields map[*opcode]struct{}) *opcode {
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if _, exists := removedFields[code]; exists {
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return prevField(code.prevField, removedFields)
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}
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return code
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}
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func nextField(code *opcode, removedFields map[*opcode]struct{}) *opcode {
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if _, exists := removedFields[code]; exists {
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return nextField(code.nextField, removedFields)
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}
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return code
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}
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func encodeLinkPrevToNextField(cur *opcode, removedFields map[*opcode]struct{}) {
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prev := prevField(cur.prevField, removedFields)
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prev.nextField = nextField(cur.nextField, removedFields)
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code := prev
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fcode := cur
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for {
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var nextCode *opcode
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switch code.op.codeType() {
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case codeArrayElem, codeSliceElem, codeMapKey:
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nextCode = code.end
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default:
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nextCode = code.next
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}
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if nextCode == fcode {
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code.next = fcode.next
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break
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} else if nextCode.op == opEnd {
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break
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}
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code = nextCode
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}
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}
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func newSliceHeaderCode(ctx *encodeCompileContext) *opcode {
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idx := opcodeOffset(ctx.ptrIndex)
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ctx.incPtrIndex()
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elemIdx := opcodeOffset(ctx.ptrIndex)
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ctx.incPtrIndex()
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length := opcodeOffset(ctx.ptrIndex)
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return &opcode{
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op: opSliceHead,
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displayIdx: ctx.opcodeIndex,
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idx: idx,
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headIdx: idx,
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elemIdx: elemIdx,
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length: length,
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indent: ctx.indent,
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}
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}
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func newSliceElemCode(ctx *encodeCompileContext, head *opcode, size uintptr) *opcode {
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return &opcode{
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op: opSliceElem,
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displayIdx: ctx.opcodeIndex,
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idx: opcodeOffset(ctx.ptrIndex),
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headIdx: head.idx,
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elemIdx: head.elemIdx,
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length: head.length,
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indent: ctx.indent,
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size: size,
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}
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}
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func newArrayHeaderCode(ctx *encodeCompileContext, alen int) *opcode {
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idx := opcodeOffset(ctx.ptrIndex)
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ctx.incPtrIndex()
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elemIdx := opcodeOffset(ctx.ptrIndex)
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return &opcode{
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op: opArrayHead,
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displayIdx: ctx.opcodeIndex,
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idx: idx,
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headIdx: idx,
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elemIdx: elemIdx,
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indent: ctx.indent,
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length: uintptr(alen),
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}
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}
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func newArrayElemCode(ctx *encodeCompileContext, head *opcode, length int, size uintptr) *opcode {
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return &opcode{
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op: opArrayElem,
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displayIdx: ctx.opcodeIndex,
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idx: opcodeOffset(ctx.ptrIndex),
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elemIdx: head.elemIdx,
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headIdx: head.headIdx,
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length: uintptr(length),
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size: size,
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}
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}
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func newMapHeaderCode(ctx *encodeCompileContext, withLoad bool) *opcode {
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var op opType
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if withLoad {
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op = opMapHeadLoad
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} else {
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op = opMapHead
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}
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idx := opcodeOffset(ctx.ptrIndex)
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ctx.incPtrIndex()
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elemIdx := opcodeOffset(ctx.ptrIndex)
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ctx.incPtrIndex()
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length := opcodeOffset(ctx.ptrIndex)
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ctx.incPtrIndex()
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mapIter := opcodeOffset(ctx.ptrIndex)
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return &opcode{
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op: op,
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typ: ctx.typ,
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displayIdx: ctx.opcodeIndex,
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idx: idx,
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elemIdx: elemIdx,
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length: length,
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mapIter: mapIter,
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indent: ctx.indent,
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}
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}
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func newMapKeyCode(ctx *encodeCompileContext, head *opcode) *opcode {
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return &opcode{
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op: opMapKey,
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displayIdx: ctx.opcodeIndex,
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idx: opcodeOffset(ctx.ptrIndex),
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elemIdx: head.elemIdx,
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length: head.length,
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mapIter: head.mapIter,
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indent: ctx.indent,
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}
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}
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func newMapValueCode(ctx *encodeCompileContext, head *opcode) *opcode {
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return &opcode{
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op: opMapValue,
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displayIdx: ctx.opcodeIndex,
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idx: opcodeOffset(ctx.ptrIndex),
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elemIdx: head.elemIdx,
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length: head.length,
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mapIter: head.mapIter,
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indent: ctx.indent,
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}
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}
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func newMapEndCode(ctx *encodeCompileContext, head *opcode) *opcode {
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mapPos := opcodeOffset(ctx.ptrIndex)
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ctx.incPtrIndex()
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idx := opcodeOffset(ctx.ptrIndex)
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return &opcode{
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op: opMapEnd,
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displayIdx: ctx.opcodeIndex,
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idx: idx,
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length: head.length,
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mapPos: mapPos,
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indent: ctx.indent,
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next: newEndOp(ctx),
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}
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}
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func newInterfaceCode(ctx *encodeCompileContext) *opcode {
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return &opcode{
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op: opInterface,
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typ: ctx.typ,
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displayIdx: ctx.opcodeIndex,
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idx: opcodeOffset(ctx.ptrIndex),
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indent: ctx.indent,
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root: ctx.root,
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next: newEndOp(ctx),
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}
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}
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func newRecursiveCode(ctx *encodeCompileContext, jmp *compiledCode) *opcode {
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return &opcode{
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op: opStructFieldRecursive,
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typ: ctx.typ,
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displayIdx: ctx.opcodeIndex,
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idx: opcodeOffset(ctx.ptrIndex),
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indent: ctx.indent,
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next: newEndOp(ctx),
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jmp: jmp,
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}
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}
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