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📁 ..
📄 addressed_test.go(4.42 KB)
📄 append_test.go(1.16 KB)
📄 arithBoundary_test.go(31.31 KB)
📄 arithConst_test.go(633.8 KB)
📄 arith_test.go(41.51 KB)
📄 array_test.go(3.09 KB)
📄 assert_test.go(2.54 KB)
📄 break_test.go(3.67 KB)
📄 chan_test.go(1.14 KB)
📄 closure_test.go(572 B)
📄 cmpConst_test.go(103.06 KB)
📄 cmp_test.go(903 B)
📄 compound_test.go(2.7 KB)
📄 copy_test.go(150.18 KB)
📄 ctl_test.go(2.33 KB)
📄 deferNoReturn_test.go(481 B)
📄 divbyzero_test.go(1.01 KB)
📄 dupLoad_test.go(1.51 KB)
📄 flowgraph_generator1.go(6.72 KB)
📄 fp_test.go(34.99 KB)
📁 gen
📄 loadstore_test.go(4.79 KB)
📄 map_test.go(721 B)
📁 mysort
📄 namedReturn_test.go(1.63 KB)
📄 phi_test.go(2.21 KB)
📄 ptrsort.go(633 B)
📄 ptrsort.out(77 B)
📄 regalloc_test.go(1.2 KB)
📁 reproducible
📄 short_test.go(1.48 KB)
📄 slice_test.go(850 B)
📄 sqrtConst_test.go(1.26 KB)
📄 string_test.go(4.46 KB)
📄 unsafe_test.go(2.96 KB)
📄 zero_test.go(49.6 KB)

Editing: unsafe_test.go

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import (
	"runtime"
	"testing"
	"unsafe"
)

// global pointer slot
var a *[8]uint

// unfoldable true
var always = true

// Test to make sure that a pointer value which is alive
// across a call is retained, even when there are matching
// conversions to/from uintptr around the call.
// We arrange things very carefully to have to/from
// conversions on either side of the call which cannot be
// combined with any other conversions.
func f_ssa() *[8]uint {
	// Make x a uintptr pointing to where a points.
	var x uintptr
	if always {
		x = uintptr(unsafe.Pointer(a))
	} else {
		x = 0
	}
	// Clobber the global pointer. The only live ref
	// to the allocated object is now x.
	a = nil

// Convert to pointer so it should hold
	// the object live across GC call.
	p := unsafe.Pointer(x)

// Call gc.
	runtime.GC()

// Convert back to uintptr.
	y := uintptr(p)

// Mess with y so that the subsequent cast
	// to unsafe.Pointer can't be combined with the
	// uintptr cast above.
	var z uintptr
	if always {
		z = y
	} else {
		z = 0
	}
	return (*[8]uint)(unsafe.Pointer(z))
}

// g_ssa is the same as f_ssa, but with a bit of pointer
// arithmetic for added insanity.
func g_ssa() *[7]uint {
	// Make x a uintptr pointing to where a points.
	var x uintptr
	if always {
		x = uintptr(unsafe.Pointer(a))
	} else {
		x = 0
	}
	// Clobber the global pointer. The only live ref
	// to the allocated object is now x.
	a = nil

// Offset x by one int.
	x += unsafe.Sizeof(int(0))

// Convert to pointer so it should hold
	// the object live across GC call.
	p := unsafe.Pointer(x)

// Call gc.
	runtime.GC()

// Convert back to uintptr.
	y := uintptr(p)

// Mess with y so that the subsequent cast
	// to unsafe.Pointer can't be combined with the
	// uintptr cast above.
	var z uintptr
	if always {
		z = y
	} else {
		z = 0
	}
	return (*[7]uint)(unsafe.Pointer(z))
}

func testf(t *testing.T) {
	a = new([8]uint)
	for i := 0; i < 8; i++ {
		a[i] = 0xabcd
	}
	c := f_ssa()
	for i := 0; i < 8; i++ {
		if c[i] != 0xabcd {
			t.Fatalf("%d:%x\n", i, c[i])
		}
	}
}

func testg(t *testing.T) {
	a = new([8]uint)
	for i := 0; i < 8; i++ {
		a[i] = 0xabcd
	}
	c := g_ssa()
	for i := 0; i < 7; i++ {
		if c[i] != 0xabcd {
			t.Fatalf("%d:%x\n", i, c[i])
		}
	}
}

func alias_ssa(ui64 *uint64, ui32 *uint32) uint32 {
	*ui32 = 0xffffffff
	*ui64 = 0                  // store
	ret := *ui32               // load from same address, should be zero
	*ui64 = 0xffffffffffffffff // store
	return ret
}
func testdse(t *testing.T) {
	x := int64(-1)
	// construct two pointers that alias one another
	ui64 := (*uint64)(unsafe.Pointer(&x))
	ui32 := (*uint32)(unsafe.Pointer(&x))
	if want, got := uint32(0), alias_ssa(ui64, ui32); got != want {
		t.Fatalf("alias_ssa: wanted %d, got %d\n", want, got)
	}
}

func TestUnsafe(t *testing.T) {
	testf(t)
	testg(t)
	testdse(t)
}

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Editing: unsafe_test.go

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