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glapi: Add the safe_{add,mul,pad} functions from xserver

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We're about to update the generator scripts to use these, easier not to
vary between client and server.

Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Adam Jackson 2016-03-24 13:57:58 -04:00
parent 7bc5c7f586
commit 88cfc9ddaa
1 changed files with 24 additions and 0 deletions
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24
src/mapi/glapi/gen/glX_proto_send.py
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@ -174,6 +174,7 @@ class PrintGlxProtoStubs(glX_proto_common.glx_print_proto):
print '#include <X11/Xlib-xcb.h>'
print '#include <xcb/xcb.h>'
print '#include <xcb/glx.h>'
print '#include <limits.h>'
print ''
print '#define __GLX_PAD(n) (((n) + 3) & ~3)'
@ -181,6 +182,29 @@ class PrintGlxProtoStubs(glX_proto_common.glx_print_proto):
self.printFastcall()
self.printNoinline()
print ''
print 'static _X_INLINE int safe_add(int a, int b)'
print '{'
print ' if (a < 0 || b < 0) return -1;'
print ' if (INT_MAX - a < b) return -1;'
print ' return a + b;'
print '}'
print 'static _X_INLINE int safe_mul(int a, int b)'
print '{'
print ' if (a < 0 || b < 0) return -1;'
print ' if (a == 0 || b == 0) return 0;'
print ' if (a > INT_MAX / b) return -1;'
print ' return a * b;'
print '}'
print 'static _X_INLINE int safe_pad(int a)'
print '{'
print ' int ret;'
print ' if (a < 0) return -1;'
print ' if ((ret = safe_add(a, 3)) < 0) return -1;'
print ' return ret & (GLuint)~3;'
print '}'
print ''
print '#ifndef __GNUC__'
print '# define __builtin_expect(x, y) x'
print '#endif'