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Ruamoko: Implement infinity.

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The special token __INFINITY__, like __FILE__ and friends, will expand to
a floating-point expression containing a value the C compiler considers
infinite. Obviously, this assumes that the system has relatively modern
float hardware -- but if it doesn't, having Ruamoko be able to represent
float infinity is the least of your problems. :)
This commit is contained in:
Jeff Teunissen 2011-12-14 12:20:10 -05:00
parent da552e33e7
commit 6ead583195
2 changed files with 16 additions and 3 deletions
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14
ruamoko/include/math.h
View file

@ -213,11 +213,19 @@
these are the same values that would be returned by any math functions or
floating-point calculations, these allow you to get the results without
actually calling them.
\note There does not appear to be a portable way to translate C's HUGE_VAL
value, the basis for positive and negative infinities, to Ruamoko.
\{
*/
# define M_E 2.7182818284590452354 ///< Euler's number \em e, the irrational base of the natural logarithm and a really neat thing
/**
Positive infinity. This is a special value replaced by the compiler with
the actual floating-point value for a positive infinity. To get a negative
infinity, just use -INFINITY.
*/
# define INFINITY __INFINITY__
/**
Euler's number \em e, the irrational base of the natural logarithm and a
really neat thing
*/
# define M_E 2.7182818284590452354
# define M_LOG2E 1.4426950408889634074 ///< The log, base 2, of \em e: <code>log2 (\ref M_E)</code>
# define M_LOG10E 0.43429448190325182765 ///< The log, base 10, of \em e: <code>log10 (\ref M_E)</code>
# define M_LN2 0.69314718055994530942 ///< The natural log evaluated at 2: <code>log (2)</code>

5
tools/qfcc/source/expr.c
View file

@ -109,6 +109,11 @@ convert_name (expr_t *e)
new = new_integer_expr (e->line);
goto convert;
}
if (!strcmp (sym->name, "__INFINITY__")
&& current_func) {
new = new_float_expr (INFINITY);
goto convert;
}
if (!strcmp (sym->name, "__FILE__")
&& current_func) {
new = new_string_expr (GETSTR (e->file));