diff options
Diffstat (limited to 'gcc/expr.h')
| -rw-r--r-- | gcc/expr.h | 25 |
1 files changed, 23 insertions, 2 deletions
@@ -208,10 +208,16 @@ do { \ /* Provide default values for the macros controlling stack checking. */ +/* The default is neither full builtin stack checking... */ #ifndef STACK_CHECK_BUILTIN #define STACK_CHECK_BUILTIN 0 #endif +/* ...nor static builtin stack checking. */ +#ifndef STACK_CHECK_STATIC_BUILTIN +#define STACK_CHECK_STATIC_BUILTIN 0 +#endif + /* The default interval is one page. */ #ifndef STACK_CHECK_PROBE_INTERVAL #define STACK_CHECK_PROBE_INTERVAL 4096 @@ -222,9 +228,24 @@ do { \ #define STACK_CHECK_PROBE_LOAD 0 #endif -/* This value is arbitrary, but should be sufficient for most machines. */ +/* This is a kludge to try to capture the discrepancy between the old + mechanism (generic stack checking) and the new mechanism (static + builtin stack checking). STACK_CHECK_PROTECT needs to be bumped + for the latter because part of the protection area is effectively + included in STACK_CHECK_MAX_FRAME_SIZE for the former. */ +#ifdef STACK_CHECK_PROTECT +#define STACK_OLD_CHECK_PROTECT STACK_CHECK_PROTECT +#else +#define STACK_OLD_CHECK_PROTECT \ + (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 8 * 1024) +#endif + +/* Minimum amount of stack required to recover from an anticipated stack + overflow detection. The default value conveys an estimate of the amount + of stack required to propagate an exception. */ #ifndef STACK_CHECK_PROTECT -#define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD) +#define STACK_CHECK_PROTECT \ + (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 12 * 1024) #endif /* Make the maximum frame size be the largest we can and still only need |