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Add explanatory comments about overflow-checking functions

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Dianne Skoll
2021-01-30 21:04:44 -05:00
parent d667c15b25
commit 04bf5b0a8b
1 changed files with 5 additions and 1 deletions
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6
src/expr.h
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@@ -5,7 +5,7 @@
/* Contains a few definitions used by expression evaluator. */
/* */
/* This file is part of REMIND. */
/* Copyright (C) 1992-2020 by Dianne Skoll */
/* Copyright (C) 1992-2021 by Dianne Skoll */
/* */
/***************************************************************/
@@ -54,6 +54,10 @@ return E_VA_STK_UNDER; \
else \
(val) = ValStack[--ValStackPtr]
/* These functions are in utils.c and are used to detect overflow
in various arithmetic operators. They have to be in separate
functions with extern linkage to defeat compiler optimizations
that would otherwise break the overflow checks. */
extern int _private_div(int a, int b);
extern int _private_add_overflow(int result, int b, int old);
extern int _private_sub_overflow(int result, int b, int old);