serialize.go

     1  // Copyright 2023 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package inlheur
     6  
     7  import "strings"
     8  
     9  func (funcProps *FuncProps) SerializeToString() string {
    10  	if funcProps == nil {
    11  		return ""
    12  	}
    13  	var sb strings.Builder
    14  	writeUleb128(&sb, uint64(funcProps.Flags))
    15  	writeUleb128(&sb, uint64(len(funcProps.ParamFlags)))
    16  	for _, pf := range funcProps.ParamFlags {
    17  		writeUleb128(&sb, uint64(pf))
    18  	}
    19  	writeUleb128(&sb, uint64(len(funcProps.ResultFlags)))
    20  	for _, rf := range funcProps.ResultFlags {
    21  		writeUleb128(&sb, uint64(rf))
    22  	}
    23  	return sb.String()
    24  }
    25  
    26  func DeserializeFromString(s string) *FuncProps {
    27  	if len(s) == 0 {
    28  		return nil
    29  	}
    30  	var funcProps FuncProps
    31  	var v uint64
    32  	sl := []byte(s)
    33  	v, sl = readULEB128(sl)
    34  	funcProps.Flags = FuncPropBits(v)
    35  	v, sl = readULEB128(sl)
    36  	funcProps.ParamFlags = make([]ParamPropBits, v)
    37  	for i := range funcProps.ParamFlags {
    38  		v, sl = readULEB128(sl)
    39  		funcProps.ParamFlags[i] = ParamPropBits(v)
    40  	}
    41  	v, sl = readULEB128(sl)
    42  	funcProps.ResultFlags = make([]ResultPropBits, v)
    43  	for i := range funcProps.ResultFlags {
    44  		v, sl = readULEB128(sl)
    45  		funcProps.ResultFlags[i] = ResultPropBits(v)
    46  	}
    47  	return &funcProps
    48  }
    49  
    50  func readULEB128(sl []byte) (value uint64, rsl []byte) {
    51  	var shift uint
    52  
    53  	for {
    54  		b := sl[0]
    55  		sl = sl[1:]
    56  		value |= (uint64(b&0x7F) << shift)
    57  		if b&0x80 == 0 {
    58  			break
    59  		}
    60  		shift += 7
    61  	}
    62  	return value, sl
    63  }
    64  
    65  func writeUleb128(sb *strings.Builder, v uint64) {
    66  	if v < 128 {
    67  		sb.WriteByte(uint8(v))
    68  		return
    69  	}
    70  	more := true
    71  	for more {
    72  		c := uint8(v & 0x7f)
    73  		v >>= 7
    74  		more = v != 0
    75  		if more {
    76  			c |= 0x80
    77  		}
    78  		sb.WriteByte(c)
    79  	}
    80  }
    81
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