| 1 | // Copyright 2021 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 generator |
| 6 | |
| 7 | import ( |
| 8 | "bytes" |
| 9 | "fmt" |
| 10 | "math" |
| 11 | ) |
| 12 | |
| 13 | // numparm describes a numeric parameter type; it implements the |
| 14 | // "parm" interface. |
| 15 | type numparm struct { |
| 16 | tag string |
| 17 | widthInBits uint32 |
| 18 | ctl bool |
| 19 | isBlank |
| 20 | addrTakenHow |
| 21 | isGenValFunc |
| 22 | skipCompare |
| 23 | } |
| 24 | |
| 25 | var f32parm *numparm = &numparm{ |
| 26 | tag: "float", |
| 27 | widthInBits: uint32(32), |
| 28 | ctl: false, |
| 29 | } |
| 30 | var f64parm *numparm = &numparm{ |
| 31 | tag: "float", |
| 32 | widthInBits: uint32(64), |
| 33 | ctl: false, |
| 34 | } |
| 35 | |
| 36 | func (p numparm) TypeName() string { |
| 37 | if p.tag == "byte" { |
| 38 | return "byte" |
| 39 | } |
| 40 | return fmt.Sprintf("%s%d", p.tag, p.widthInBits) |
| 41 | } |
| 42 | |
| 43 | func (p numparm) QualName() string { |
| 44 | return p.TypeName() |
| 45 | } |
| 46 | |
| 47 | func (p numparm) String() string { |
| 48 | if p.tag == "byte" { |
| 49 | return "byte" |
| 50 | } |
| 51 | ctl := "" |
| 52 | if p.ctl { |
| 53 | ctl = " [ctl=yes]" |
| 54 | } |
| 55 | return fmt.Sprintf("%s%s", p.TypeName(), ctl) |
| 56 | } |
| 57 | |
| 58 | func (p numparm) NumElements() int { |
| 59 | return 1 |
| 60 | } |
| 61 | |
| 62 | func (p numparm) IsControl() bool { |
| 63 | return p.ctl |
| 64 | } |
| 65 | |
| 66 | func (p numparm) GenElemRef(elidx int, path string) (string, parm) { |
| 67 | return path, &p |
| 68 | } |
| 69 | |
| 70 | func (p numparm) Declare(b *bytes.Buffer, prefix string, suffix string, caller bool) { |
| 71 | t := fmt.Sprintf("%s%d%s", p.tag, p.widthInBits, suffix) |
| 72 | if p.tag == "byte" { |
| 73 | t = fmt.Sprintf("%s%s", p.tag, suffix) |
| 74 | } |
| 75 | b.WriteString(prefix + " " + t) |
| 76 | } |
| 77 | |
| 78 | func (p numparm) genRandNum(s *genstate, value int) (string, int) { |
| 79 | which := uint8(s.wr.Intn(int64(100))) |
| 80 | if p.tag == "int" { |
| 81 | var v int64 |
| 82 | if which < 3 { |
| 83 | // max |
| 84 | v = (1 << (p.widthInBits - 1)) - 1 |
| 85 | |
| 86 | } else if which < 5 { |
| 87 | // min |
| 88 | v = (-1 << (p.widthInBits - 1)) |
| 89 | } else { |
| 90 | nrange := int64(1 << (p.widthInBits - 2)) |
| 91 | v = s.wr.Intn(nrange) |
| 92 | if value%2 != 0 { |
| 93 | v = -v |
| 94 | } |
| 95 | } |
| 96 | return fmt.Sprintf("%s%d(%d)", p.tag, p.widthInBits, v), value + 1 |
| 97 | } |
| 98 | if p.tag == "uint" || p.tag == "byte" { |
| 99 | nrange := int64(1 << (p.widthInBits - 2)) |
| 100 | v := s.wr.Intn(nrange) |
| 101 | if p.tag == "byte" { |
| 102 | return fmt.Sprintf("%s(%d)", p.tag, v), value + 1 |
| 103 | } |
| 104 | return fmt.Sprintf("%s%d(0x%x)", p.tag, p.widthInBits, v), value + 1 |
| 105 | } |
| 106 | if p.tag == "float" { |
| 107 | if p.widthInBits == 32 { |
| 108 | rf := s.wr.Float32() * (math.MaxFloat32 / 4) |
| 109 | if value%2 != 0 { |
| 110 | rf = -rf |
| 111 | } |
| 112 | return fmt.Sprintf("%s%d(%v)", p.tag, p.widthInBits, rf), value + 1 |
| 113 | } |
| 114 | if p.widthInBits == 64 { |
| 115 | return fmt.Sprintf("%s%d(%v)", p.tag, p.widthInBits, |
| 116 | s.wr.NormFloat64()), value + 1 |
| 117 | } |
| 118 | panic("unknown float type") |
| 119 | } |
| 120 | if p.tag == "complex" { |
| 121 | if p.widthInBits == 64 { |
| 122 | f1, v2 := f32parm.genRandNum(s, value) |
| 123 | f2, v3 := f32parm.genRandNum(s, v2) |
| 124 | return fmt.Sprintf("complex(%s,%s)", f1, f2), v3 |
| 125 | } |
| 126 | if p.widthInBits == 128 { |
| 127 | f1, v2 := f64parm.genRandNum(s, value) |
| 128 | f2, v3 := f64parm.genRandNum(s, v2) |
| 129 | return fmt.Sprintf("complex(%v,%v)", f1, f2), v3 |
| 130 | } |
| 131 | panic("unknown complex type") |
| 132 | } |
| 133 | panic("unknown numeric type") |
| 134 | } |
| 135 | |
| 136 | func (p numparm) GenValue(s *genstate, f *funcdef, value int, caller bool) (string, int) { |
| 137 | r, nv := p.genRandNum(s, value) |
| 138 | verb(5, "numparm.GenValue(%d) = %s", value, r) |
| 139 | return r, nv |
| 140 | } |
| 141 | |
| 142 | func (p numparm) HasPointer() bool { |
| 143 | return false |
| 144 | } |
| 145 |
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