var x C.size_t

	C.calloc(x, x)
	C.malloc(x)
	C.realloc(nil, x)
	C.memcpy(nil, nil, x)
	C.memcmp(nil, nil, x)
	C.memmove(nil, nil, x)
	C.strncpy(nil, nil, x)
	C.strncmp(nil, nil, x)
	C.strncat(nil, nil, x)
	x = C.strxfrm(nil, nil, x)
	C.memchr(nil, 0, x)
	x = C.strcspn(nil, nil)
	x = C.strspn(nil, nil)
	C.memset(nil, 0, x)
	x = C.strlen(nil)
	_ = x

All Go pointers passed to C must point to pinned Go memory. Go pointers
passed as function arguments to C functions have the memory they point to
implicitly pinned for the duration of the call. Go memory reachable from
these function arguments must be pinned as long as the C code has access
to it. Whether Go memory is pinned is a dynamic property of that memory
region; it has nothing to do with the type of the pointer.

### New structs package

The new [structs] package provides
types for struct fields that modify properties of
the containing struct type such as memory layout.

In this release, the only such type is
[`HostLayout`](/pkg/structs#HostLayout)
which indicates that a structure with a field of that
type has a layout that conforms to host platform

const (
	AUNK   AlgKind = iota
	ANOEQ          // Types cannot be compared
	ANOALG         // implies ANOEQ, and in addition has a part that is marked Noalg
	AMEM           // Type can be compared/hashed as regular memory.
	AMEM0          // Specific subvariants of AMEM (TODO: move to ../reflectdata?)
	AMEM8
	AMEM16
	AMEM32
	AMEM64
	AMEM128
	ASTRING
	AINTER
	ANILINTER
	AFLOAT32
	AFLOAT64
	ACPLX64
	ACPLX128

// an enclosing function and can be ignored.
// The nest list describes the stack (the "nest in memory") of types which
// contain (or embed in the case of interfaces) other types. For instance, a
// struct named S which contains a field of named type F contains (the memory
// of) F in S, leading to the nest S->F. If a type appears in its own nest

	}
	return file, entry, nil
}

// GetBytes looks up the action ID in the cache and returns
// the corresponding output bytes.
// GetBytes should only be used for data that can be expected to fit in memory.
func GetBytes(c Cache, id ActionID) ([]byte, Entry, error) {
	entry, err := c.Get(id)
	if err != nil {
		return nil, entry, err
	}
	data, _ := os.ReadFile(c.OutputFile(entry.OutputID))

// making a copy of an array.
//
// This tells _cgoCheckPointer to check the complete contents of the
// slice or array being indexed, but no other part of the memory allocation.
func (p *Package) checkIndex(sb, sbCheck *bytes.Buffer, arg ast.Expr, i int) bool {
	// Strip type conversions.
	x := arg
	for {
		c, ok := x.(*ast.CallExpr)
		if !ok || len(c.Args) != 1 {

	for i, ctxt := range ctxts {
		hashes[i] = ctxt.instanceHash(orig, targs)
	}

	// Record the result in all contexts.
	// Prefer to re-use existing types from expanding context, if it exists, to reduce
	// the memory pinned by the Named type.
	updateContexts := func(res Type) Type {
		for i := len(ctxts) - 1; i >= 0; i-- {
			res = ctxts[i].update(hashes[i], orig, targs, res)
		}
		return res
	}

	{name: "AtomicLoad32", argLength: 2, typ: "(UInt32,Mem)"},                                  // Load from arg0.  arg1=memory.  Returns loaded value and new memory.
	{name: "AtomicLoad64", argLength: 2, typ: "(UInt64,Mem)"},                                  // Load from arg0.  arg1=memory.  Returns loaded value and new memory.

	    Writes test binary as -c would.

	-memprofilerate n
	    Enable more precise (and expensive) memory allocation profiles by
	    setting runtime.MemProfileRate. See 'go doc runtime.MemProfileRate'.
	    To profile all memory allocations, use -test.memprofilerate=1.

	-mutexprofile mutex.out
	    Write a mutex contention profile to the specified file