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Revert "Work around a glibc bug: backtrace() spuriously fails if..."

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This commit has been breaking the FreeBSD bots:
http://lab.llvm.org:8011/builders/lld-x86_64-freebsd

This reverts commit r269992.

llvm-svn: 270267
This commit is contained in:
Chris Bieneman 2016-05-20 20:15:17 +00:00
parent f536e5debc
commit 681d988432
2 changed files with 4 additions and 52 deletions
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1
cmake/config-ix.cmake
View File

@ -144,7 +144,6 @@ endif()
# function checks
check_symbol_exists(arc4random "stdlib.h" HAVE_DECL_ARC4RANDOM)
check_symbol_exists(backtrace "execinfo.h" HAVE_BACKTRACE)
check_symbol_exists(_Unwind_Backtrace "unwind.h" HAVE_UNWIND_BACKTRACE)
check_symbol_exists(getpagesize unistd.h HAVE_GETPAGESIZE)
check_symbol_exists(getrusage sys/resource.h HAVE_GETRUSAGE)
check_symbol_exists(setrlimit sys/resource.h HAVE_SETRLIMIT)

53
lib/Support/Unix/Signals.inc
View File

@ -45,9 +45,6 @@
#if HAVE_LINK_H
#include <link.h>
#endif
#if HAVE_UNWIND_BACKTRACE
#include <unwind.h>
#endif
using namespace llvm;
@ -312,61 +309,17 @@ static bool findModulesAndOffsets(void **StackTrace, int Depth,
}
#endif // defined(HAVE_BACKTRACE) && defined(ENABLE_BACKTRACES) && ...
#if defined(ENABLE_BACKTRACES) && defined(HAVE_UNWIND_BACKTRACE)
static int unwindBacktrace(void **StackTrace, int MaxEntries) {
if (MaxEntries < 0)
return 0;
// Skip the first frame ('unwindBacktrace' itself).
int Entries = -1;
auto HandleFrame = [&](_Unwind_Context *Context) -> _Unwind_Reason_Code {
// Apparently we need to detect reaching the end of the stack ourselves.
void *IP = (void *)_Unwind_GetIP(Context);
if (!IP)
return _URC_END_OF_STACK;
assert(Entries < MaxEntries && "recursively called after END_OF_STACK?");
if (Entries >= 0)
StackTrace[Entries] = IP;
if (++Entries == MaxEntries)
return _URC_END_OF_STACK;
return _URC_NO_REASON;
};
_Unwind_Backtrace(
[](_Unwind_Context *Context, void *Handler) {
return (*static_cast<decltype(HandleFrame) *>(Handler))(Context);
},
static_cast<void *>(&HandleFrame));
return std::max(Entries, 0);
}
#endif
// PrintStackTrace - In the case of a program crash or fault, print out a stack
// trace so that the user has an indication of why and where we died.
//
// On glibc systems we have the 'backtrace' function, which works nicely, but
// doesn't demangle symbols.
void llvm::sys::PrintStackTrace(raw_ostream &OS) {
#if defined(ENABLE_BACKTRACES)
#if defined(HAVE_BACKTRACE) && defined(ENABLE_BACKTRACES)
static void* StackTrace[256];
int depth = 0;
#if defined(HAVE_BACKTRACE)
// Use backtrace() to output a backtrace on Linux systems with glibc.
if (!depth)
depth = backtrace(StackTrace, static_cast<int>(array_lengthof(StackTrace)));
#endif
#if defined(HAVE_UNWIND_BACKTRACE)
// Try _Unwind_Backtrace() if backtrace() failed.
if (!depth)
depth = unwindBacktrace(StackTrace,
int depth = backtrace(StackTrace,
static_cast<int>(array_lengthof(StackTrace)));
#endif
if (!depth)
return;
if (printSymbolizedStackTrace(StackTrace, depth, OS))
return;
#if HAVE_DLFCN_H && __GNUG__
@ -416,7 +369,7 @@ void llvm::sys::PrintStackTrace(raw_ostream &OS) {
}
OS << '\n';
}
#elif defined(HAVE_BACKTRACE)
#else
backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
#endif
#endif