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| author | Nick Clifton <nickc@redhat.com> | 2014-05-19 13:27:25 +0000 |
|---|---|---|
| committer | Nick Clifton <nickc@gcc.gnu.org> | 2014-05-19 13:27:25 +0000 |
| commit | 40ba8dfb395e8ed85990a2655cf0d8a0f7619e0c (patch) | |
| tree | d9e926e92becdcc52937f952332b22bbeb3bde5a /gcc/except.c | |
| parent | cb460086e1601d7ed22a2d911adede51c945c66f (diff) | |
| download | gcc-40ba8dfb395e8ed85990a2655cf0d8a0f7619e0c.zip gcc-40ba8dfb395e8ed85990a2655cf0d8a0f7619e0c.tar.gz gcc-40ba8dfb395e8ed85990a2655cf0d8a0f7619e0c.tar.bz2 | |
except.c (init_eh): Fix computation of builtin setjmp buffer size to allow for targets where...
* except.c (init_eh): Fix computation of builtin setjmp buffer
size to allow for targets where POINTER_SIZE > BITS_PER_WORD.
From-SVN: r210612
Diffstat (limited to 'gcc/except.c')
| -rw-r--r-- | gcc/except.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/gcc/except.c b/gcc/except.c index 49ebaae..8298593 100644 --- a/gcc/except.c +++ b/gcc/except.c @@ -286,9 +286,22 @@ init_eh (void) tmp = size_int (FIRST_PSEUDO_REGISTER + 2 - 1); #endif #else - /* builtin_setjmp takes a pointer to 5 words. */ - tmp = size_int (5 * BITS_PER_WORD / POINTER_SIZE - 1); + /* Compute a minimally sized jump buffer. We need room to store at + least 3 pointers - stack pointer, frame pointer and return address. + Plus for some targets we need room for an extra pointer - in the + case of MIPS this is the global pointer. This makes a total of four + pointers, but to be safe we actually allocate room for 5. + + If pointers are smaller than words then we allocate enough room for + 5 words, just in case the backend needs this much room. For more + discussion on this issue see: + http://gcc.gnu.org/ml/gcc-patches/2014-05/msg00313.html. */ + if (POINTER_SIZE > BITS_PER_WORD) + tmp = size_int (5 - 1); + else + tmp = size_int ((5 * BITS_PER_WORD / POINTER_SIZE) - 1); #endif + tmp = build_index_type (tmp); tmp = build_array_type (ptr_type_node, tmp); f_jbuf = build_decl (BUILTINS_LOCATION, |