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glsl: Fix isinf() for non-C99-compliant compilers.

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Commit ede60bc467 (glsl: Add isinf() and
isnan() builtins) uses "+INF" in the .ir file to represent infinity.
This worked on C99-compliant compilers, since the s-expression reader
uses strtod() to read numbers, and C99 requires strtod() to understand
"+INF".  However, it didn't work on non-C99-compliant compilers such
as MSVC.

This patch modifies the s-expression reader to explicitly check for
"+INF" rather than relying on strtod() to support it.

This is a candidate for the 8.0 branch.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=44767
Tested-by: Morgan Armand <morgan.devel@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Paul Berry
2012-01-17 10:28:10 -08:00
parent 5e576efef2
commit 4f82fed493
1 changed files with 22 additions and 14 deletions
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36
src/glsl/s_expression.cpp
View File

@@ -23,6 +23,7 @@
*/
#include <assert.h>
#include <limits>
#include "s_expression.h"
s_symbol::s_symbol(const char *str, size_t n)
@@ -64,21 +65,28 @@ read_atom(void *ctx, const char *&src, char *&symbol_buffer)
if (n == 0)
return NULL; // no atom
// Check if the atom is a number.
char *float_end = NULL;
double f = glsl_strtod(src, &float_end);
if (float_end != src) {
char *int_end = NULL;
int i = strtol(src, &int_end, 10);
// If strtod matched more characters, it must have a decimal part
if (float_end > int_end)
expr = new(ctx) s_float(f);
else
expr = new(ctx) s_int(i);
// Check for the special symbol '+INF', which means +Infinity. Note: C99
// requires strtod to parse '+INF' as +Infinity, but we still support some
// non-C99-compliant compilers (e.g. MSVC).
if (n == 4 && strncmp(src, "+INF", 4) == 0) {
expr = new(ctx) s_float(std::numeric_limits<float>::infinity());
} else {
// Not a number; return a symbol.
symbol_buffer[n] = '\0';
expr = new(ctx) s_symbol(symbol_buffer, n);
// Check if the atom is a number.
char *float_end = NULL;
double f = glsl_strtod(src, &float_end);
if (float_end != src) {
char *int_end = NULL;
int i = strtol(src, &int_end, 10);
// If strtod matched more characters, it must have a decimal part
if (float_end > int_end)
expr = new(ctx) s_float(f);
else
expr = new(ctx) s_int(i);
} else {
// Not a number; return a symbol.
symbol_buffer[n] = '\0';
expr = new(ctx) s_symbol(symbol_buffer, n);
}
}
src += n;