diff options
Diffstat (limited to 'lib/pure/volatile.nim')
-rw-r--r-- | lib/pure/volatile.nim | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/lib/pure/volatile.nim b/lib/pure/volatile.nim new file mode 100644 index 000000000..a38247c7d --- /dev/null +++ b/lib/pure/volatile.nim @@ -0,0 +1,34 @@ +# +# +# Nim's Runtime Library +# (c) Copyright 2017 Jeff Ciesielski +# +# See the file "copying.txt", included in this +# distribution, for details about the copyright. +# + +## This module contains code for generating volatile loads and stores, +## which are useful in embedded and systems programming. + +proc volatileLoad*[T](src: ptr T): T {.inline, noinit.} = + ## Generates a volatile load of the value stored in the container `src`. + ## Note that this only effects code generation on `C` like backends. + when nimvm: + result = src[] + else: + when defined(js): + result = src[] + else: + {.emit: [result, " = (*(", typeof(src[]), " volatile*)", src, ");"].} + +proc volatileStore*[T](dest: ptr T, val: T) {.inline.} = + ## Generates a volatile store into the container `dest` of the value + ## `val`. Note that this only effects code generation on `C` like + ## backends. + when nimvm: + dest[] = val + else: + when defined(js): + dest[] = val + else: + {.emit: ["*((", typeof(dest[]), " volatile*)(", dest, ")) = ", val, ";"].} |