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https://github.com/golang/go
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![Richard Musiol](/assets/img/avatar_default.png)
The general policy for the current state of js/wasm is that it only has to support tests that are also supported by nacl. The test nilptr3.go makes assumptions about which nil checks can be removed. Since WebAssembly does not signal on reading a null pointer, all nil checks have to be explicit. Updates #18892 Change-Id: I06a687860b8d22ae26b1c391499c0f5183e4c485 Reviewed-on: https://go-review.googlesource.com/110096 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
181 lines
4.8 KiB
Go
181 lines
4.8 KiB
Go
// runoutput
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// terribly slow on wasm
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// +build !wasm
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package main
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import (
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"fmt"
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"math/big"
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"unsafe"
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)
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var one = big.NewInt(1)
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type _type struct {
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name string
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bits uint
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signed bool
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}
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// testvalues returns a list of all test values for this type.
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func (t *_type) testvalues() []*big.Int {
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var a []*big.Int
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a = append(a, big.NewInt(0))
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a = append(a, big.NewInt(1))
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a = append(a, big.NewInt(2))
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if t.signed {
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a = append(a, big.NewInt(-1))
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a = append(a, big.NewInt(-2))
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r := big.NewInt(1)
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a = append(a, r.Lsh(r, t.bits-1).Sub(r, big.NewInt(1)))
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r = big.NewInt(1)
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a = append(a, r.Lsh(r, t.bits-1).Sub(r, big.NewInt(2)))
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r = big.NewInt(1)
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a = append(a, r.Lsh(r, t.bits-1).Neg(r))
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r = big.NewInt(1)
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a = append(a, r.Lsh(r, t.bits-1).Neg(r).Add(r, big.NewInt(1)))
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} else {
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r := big.NewInt(1)
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a = append(a, r.Lsh(r, t.bits).Sub(r, big.NewInt(1)))
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r = big.NewInt(1)
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a = append(a, r.Lsh(r, t.bits).Sub(r, big.NewInt(2)))
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}
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return a
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}
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// trunc truncates a value to the range of the given type.
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func (t *_type) trunc(x *big.Int) *big.Int {
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r := new(big.Int)
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m := new(big.Int)
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m.Lsh(one, t.bits)
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m.Sub(m, one)
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r.And(x, m)
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if t.signed && r.Bit(int(t.bits)-1) == 1 {
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m.Neg(one)
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m.Lsh(m, t.bits)
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r.Or(r, m)
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}
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return r
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}
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var types = []_type{
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_type{"byte", 8, false},
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_type{"int8", 8, true},
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_type{"uint8", 8, false},
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_type{"rune", 32, true},
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_type{"int16", 16, true},
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_type{"uint16", 16, false},
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_type{"int32", 32, true},
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_type{"uint32", 32, false},
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_type{"int64", 64, true},
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_type{"uint64", 64, false},
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_type{"int", 8 * uint(unsafe.Sizeof(int(0))), true},
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_type{"uint", 8 * uint(unsafe.Sizeof(uint(0))), false},
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_type{"uintptr", 8 * uint(unsafe.Sizeof((*byte)(nil))), false},
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}
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type binop struct {
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name string
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eval func(x, y *big.Int) *big.Int
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}
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var binops = []binop{
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binop{"+", func(x, y *big.Int) *big.Int { return new(big.Int).Add(x, y) }},
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binop{"-", func(x, y *big.Int) *big.Int { return new(big.Int).Sub(x, y) }},
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binop{"*", func(x, y *big.Int) *big.Int { return new(big.Int).Mul(x, y) }},
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binop{"/", func(x, y *big.Int) *big.Int { return new(big.Int).Quo(x, y) }},
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binop{"%", func(x, y *big.Int) *big.Int { return new(big.Int).Rem(x, y) }},
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binop{"&", func(x, y *big.Int) *big.Int { return new(big.Int).And(x, y) }},
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binop{"|", func(x, y *big.Int) *big.Int { return new(big.Int).Or(x, y) }},
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binop{"^", func(x, y *big.Int) *big.Int { return new(big.Int).Xor(x, y) }},
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binop{"&^", func(x, y *big.Int) *big.Int { return new(big.Int).AndNot(x, y) }},
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}
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type unop struct {
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name string
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eval func(x *big.Int) *big.Int
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}
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var unops = []unop{
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unop{"+", func(x *big.Int) *big.Int { return new(big.Int).Set(x) }},
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unop{"-", func(x *big.Int) *big.Int { return new(big.Int).Neg(x) }},
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unop{"^", func(x *big.Int) *big.Int { return new(big.Int).Not(x) }},
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}
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type shiftop struct {
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name string
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eval func(x *big.Int, i uint) *big.Int
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}
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var shiftops = []shiftop{
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shiftop{"<<", func(x *big.Int, i uint) *big.Int { return new(big.Int).Lsh(x, i) }},
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shiftop{">>", func(x *big.Int, i uint) *big.Int { return new(big.Int).Rsh(x, i) }},
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}
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// valname returns the name of n as can be used as part of a variable name.
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func valname(n *big.Int) string {
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s := fmt.Sprintf("%d", n)
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if s[0] == '-' {
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s = "neg" + s[1:]
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}
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return s
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}
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func main() {
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fmt.Println("package main")
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// We make variables to hold all the different values we'd like to use.
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// We use global variables to prevent any constant folding.
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for _, t := range types {
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for _, n := range t.testvalues() {
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fmt.Printf("var %s_%s %s = %d\n", t.name, valname(n), t.name, n)
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}
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}
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fmt.Println("func main() {")
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for _, t := range types {
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// test binary ops
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for _, op := range binops {
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for _, x := range t.testvalues() {
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for _, y := range t.testvalues() {
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if (op.name == "/" || op.name == "%") && y.Sign() == 0 {
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continue
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}
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r := t.trunc(op.eval(x, y))
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eqn := fmt.Sprintf("%s_%s %s %s_%s != %d", t.name, valname(x), op.name, t.name, valname(y), r)
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fmt.Printf("\tif %s { println(\"bad: %s\") }\n", eqn, eqn)
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}
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}
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}
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// test unary ops
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for _, op := range unops {
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for _, x := range t.testvalues() {
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r := t.trunc(op.eval(x))
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eqn := fmt.Sprintf("%s %s_%s != %d", op.name, t.name, valname(x), r)
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fmt.Printf("\tif %s { println(\"bad: %s\") }\n", eqn, eqn)
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}
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}
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// test shifts
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for _, op := range shiftops {
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for _, x := range t.testvalues() {
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for _, i := range []uint{0, 1, t.bits - 2, t.bits - 1, t.bits, t.bits + 1} {
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r := t.trunc(op.eval(x, i))
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eqn := fmt.Sprintf("%s_%s %s %d != %d", t.name, valname(x), op.name, i, r)
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fmt.Printf("\tif %s { println(\"bad: %s\") }\n", eqn, eqn)
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}
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}
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}
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}
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fmt.Println("}")
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}
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