Skip to content

Commit

Permalink
Add volatile load/store
Browse files Browse the repository at this point in the history
Adds volatile load/store capability to the impure part of the standard
library.  Note that this currently only supports numerical types.

Should resolve nim-lang#3382
  • Loading branch information
Jeff-Ciesielski committed Jan 25, 2017
1 parent c7e54eb commit 01160ad
Showing 1 changed file with 30 additions and 0 deletions.
30 changes: 30 additions & 0 deletions lib/impure/volatile.nim
Original file line number Diff line number Diff line change
@@ -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: SomeNumber](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: SomeNumber](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, ";"].}

0 comments on commit 01160ad

Please sign in to comment.