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// 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.
//go:build msan
package runtime
import (
"unsafe"
)
// Public memory sanitizer API.
func MSanRead(addr unsafe.Pointer, len int) {
msanread(addr, uintptr(len))
}
func MSanWrite(addr unsafe.Pointer, len int) {
msanwrite(addr, uintptr(len))
}
// Private interface for the runtime.
const msanenabled = true
// If we are running on the system stack, the C program may have
// marked part of that stack as uninitialized. We don't instrument
// the runtime, but operations like a slice copy can call msanread
// anyhow for values on the stack. Just ignore msanread when running
// on the system stack. The other msan functions are fine.
//
//go:nosplit
func msanread(addr unsafe.Pointer, sz uintptr) {
gp := getg()
if gp == nil || gp.m == nil || gp == gp.m.g0 || gp == gp.m.gsignal {
return
}
domsanread(addr, sz)
}
//go:noescape
func domsanread(addr unsafe.Pointer, sz uintptr)
//go:noescape
func msanwrite(addr unsafe.Pointer, sz uintptr)
//go:noescape
func msanmalloc(addr unsafe.Pointer, sz uintptr)
//go:noescape
func msanfree(addr unsafe.Pointer, sz uintptr)
//go:noescape
func msanmove(dst, src unsafe.Pointer, sz uintptr)
// These are called from msan_GOARCH.s
//
//go:cgo_import_static __msan_read_go
//go:cgo_import_static __msan_write_go
//go:cgo_import_static __msan_malloc_go
//go:cgo_import_static __msan_free_go
//go:cgo_import_static __msan_memmove