diff options
author | Duncan P. N. Exon Smith <dexonsmith@apple.com> | 2014-03-23 03:38:05 +0000 |
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committer | Duncan P. N. Exon Smith <dexonsmith@apple.com> | 2014-03-23 03:38:05 +0000 |
commit | d00c9beebfccb89fda8ac295e2909d57843fe313 (patch) | |
tree | 7f74e2355ed19b34176934f03696d0f08be8bf0a /lib/profile/InstrProfiling.c | |
parent | e41aa24fe9db576a911cc2fe6f1a42637d3ac043 (diff) |
InstrProf: Indicate pointer size in raw profile
Since the profile can come from 32-bit machines, the reader needs to
check the pointer size. Change the magic number to facilitate this.
<rdar://problem/16400648>
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@204556 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/profile/InstrProfiling.c')
-rw-r--r-- | lib/profile/InstrProfiling.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/profile/InstrProfiling.c b/lib/profile/InstrProfiling.c index 970907c40..123dd0d3b 100644 --- a/lib/profile/InstrProfiling.c +++ b/lib/profile/InstrProfiling.c @@ -14,11 +14,13 @@ uint64_t __llvm_profile_get_magic(void) { /* Magic number to detect file format and endianness. * * Use 255 at one end, since no UTF-8 file can use that character. Avoid 0, - * so that utilities like strings doesn't grab it as a string. 129 is high - * enough to be interesting. + * so that utilities, like strings, don't grab it as a string. 129 is also + * invalid UTF-8, and high enough to be interesting. * - * Use "lprofr" in the centre to stand for "LLVM Profile Raw". + * Use "lprofr" in the centre to stand for "LLVM Profile Raw", or "lprofR" + * for 32-bit platforms. */ + unsigned char R = sizeof(void *) == sizeof(uint64_t) ? 'r' : 'R'; return (uint64_t)255 << 56 | (uint64_t)'l' << 48 | @@ -26,7 +28,7 @@ uint64_t __llvm_profile_get_magic(void) { (uint64_t)'r' << 32 | (uint64_t)'o' << 24 | (uint64_t)'f' << 16 | - (uint64_t)'r' << 8 | + (uint64_t) R << 8 | (uint64_t)129; } |