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typedef rb_jmpbuf_t to void *[5] if __builtin_setjmp is used

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The built-in version operates on a buffer of 5 words, much smaller than
the size of jmp_buf defined in libc.
Note, powerpc requires 5 words, while arm and x86_64 just require 3.
This commit is contained in:
Fangrui Song 2019-09-19 00:04:29 -07:00 • committed by Nobuyoshi Nakada
parent 27144de2bd
commit e006b992c2
Notes: git 2019-09-21 13:25:23 +09:00
2 changed files with 5 additions and 1 deletions
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2
tool/m4/ruby_setjmp_type.m4
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@ -47,6 +47,6 @@ AS_IF([test x$setjmp_prefix:$setjmp_sigmask = xsig:], [
AC_MSG_RESULT(${setjmp_prefix}setjmp${setjmp_suffix}${setjmp_cast:+\($setjmp_cast\)}${setjmp_sigmask})
AC_DEFINE_UNQUOTED([RUBY_SETJMP(env)], [${setjmp_prefix}setjmp${setjmp_suffix}($setjmp_cast(env)${setjmp_sigmask})])
AC_DEFINE_UNQUOTED([RUBY_LONGJMP(env,val)], [${setjmp_prefix}longjmp($setjmp_cast(env),val)])
AC_DEFINE_UNQUOTED(RUBY_JMP_BUF, ${setjmp_sigmask+${setjmp_prefix}}jmp_buf)
AS_IF([test x$setjmp_prefix != x__builtin_], AC_DEFINE_UNQUOTED(RUBY_JMP_BUF, ${setjmp_sigmask+${setjmp_prefix}}jmp_buf))
AS_IF([test x$setjmp_suffix = xex], [AC_DEFINE_UNQUOTED(RUBY_USE_SETJMPEX, 1)])
])dnl

4
vm_core.h
View file

@ -775,7 +775,11 @@ enum rb_thread_status {
THREAD_KILLED
};
#ifdef RUBY_JMP_BUF
typedef RUBY_JMP_BUF rb_jmpbuf_t;
#else
typedef void *rb_jmpbuf_t[5];
#endif
/*
the members which are written in EC_PUSH_TAG() should be placed at