2012-09-20 14:48:45 +00:00
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--- valgrind/coregrind/m_stacktrace.c.jj 2012-08-05 18:04:16.000000000 +0200
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+++ valgrind/coregrind/m_stacktrace.c 2012-08-10 12:13:46.069797051 +0200
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2012-08-10 10:27:57 +00:00
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@@ -149,11 +149,23 @@ UInt VG_(get_StackTrace_wrk) ( ThreadId
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/* Try to derive a new (ip,sp,fp) triple from the current
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set. */
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- /* On x86, first try the old-fashioned method of following the
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- %ebp-chain. Code which doesn't use this (that is, compiled
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- with -fomit-frame-pointer) is not ABI compliant and so
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- relatively rare. Besides, trying the CFI first almost always
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- fails, and is expensive. */
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+ /* On x86 GCC 4.6 and later now defaults to -fomit-frame-pointer
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+ together with emitting unwind info (-fasynchronous-unwind-tables).
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+ So, try CF info first. */
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+ if ( VG_(use_CF_info)( &uregs, fp_min, fp_max ) ) {
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+ if (0 == uregs.xip || 1 == uregs.xip) break;
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+ if (sps) sps[i] = uregs.xsp;
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+ if (fps) fps[i] = uregs.xbp;
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+ ips[i++] = uregs.xip - 1; /* -1: refer to calling insn, not the RA */
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+ if (debug)
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+ VG_(printf)(" ipsC[%d]=0x%08lx\n", i-1, ips[i-1]);
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+ uregs.xip = uregs.xip - 1;
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+ /* as per comment at the head of this loop */
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+ continue;
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+ }
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+
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+ /* And only then the old-fashioned method of following the
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+ %ebp-chain. */
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/* Deal with frames resulting from functions which begin "pushl%
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ebp ; movl %esp, %ebp" which is the ABI-mandated preamble. */
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if (fp_min <= uregs.xbp &&
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@@ -179,20 +191,6 @@ UInt VG_(get_StackTrace_wrk) ( ThreadId
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uregs.xip = uregs.xip - 1;
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/* as per comment at the head of this loop */
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continue;
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- }
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-
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- /* That didn't work out, so see if there is any CF info to hand
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- which can be used. */
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- if ( VG_(use_CF_info)( &uregs, fp_min, fp_max ) ) {
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- if (0 == uregs.xip || 1 == uregs.xip) break;
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- if (sps) sps[i] = uregs.xsp;
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- if (fps) fps[i] = uregs.xbp;
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- ips[i++] = uregs.xip - 1; /* -1: refer to calling insn, not the RA */
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- if (debug)
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- VG_(printf)(" ipsC[%d]=0x%08lx\n", i-1, ips[i-1]);
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- uregs.xip = uregs.xip - 1;
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- /* as per comment at the head of this loop */
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- continue;
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}
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/* And, similarly, try for MSVC FPO unwind info. */
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