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Diffstat (limited to 'lib/pure/volatile.nim')
-rw-r--r-- | lib/pure/volatile.nim | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/lib/pure/volatile.nim b/lib/pure/volatile.nim new file mode 100644 index 000000000..b3705a199 --- /dev/null +++ b/lib/pure/volatile.nim @@ -0,0 +1,30 @@ +# +# +# 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. + +template volatileLoad*[T](src: ptr T): T = + ## Generates a volatile load of the value stored in the container `src`. + ## Note that this only effects code generation on `C` like backends + when defined(js): + src[] + else: + var res: T + {.emit: [res, " = (*(", type(src[]), " volatile*)", src, ");"].} + res + +template volatileStore*[T](dest: ptr T, val: T) = + ## Generates a volatile store into the container `dest` of the value + ## `val`. Note that this only effects code generation on `C` like + ## backends + when defined(js): + dest[] = val + else: + {.emit: ["*((", type(dest[]), " volatile*)(", dest, ")) = ", val, ";"].} |