llgo/ssa: SizeOf, MakeSlice, VoidPtr

internal/runtime/z_c.go

@@ -23,11 +23,22 @@ import (
 	"github.com/goplus/llgo/internal/runtime/c"
 )
 
-// Alloc allocates memory.
-func Alloc(size uintptr) unsafe.Pointer {
+// AllocU allocates uninitialized memory.
+func AllocU(size uintptr) unsafe.Pointer {
 	return c.Malloc(size)
 }
 
+// AllocZ allocates zero-initialized memory.
+func AllocZ(size uintptr) unsafe.Pointer {
+	ret := c.Malloc(size)
+	return c.Memset(ret, 0, size)
+}
+
+// Zeroinit initializes memory to zero.
+func Zeroinit(p c.Pointer, size uintptr) c.Pointer {
+	return c.Memset(p, 0, size)
+}
+
 // TracePanic prints panic message.
 func TracePanic(v Interface) {
 	kind := abi.Kind(v.tab._type.Kind_)