libbacktrace: Add support for Mach-O (dSYM)

`macho.cpp` was backported from official libbacktrace repository.

TracyClient.cpp

@@ -24,15 +24,19 @@
 #include "client/tracy_rpmalloc.cpp"
 #include "client/TracyDxt1.cpp"
 
-#if TRACY_HAS_CALLSTACK == 2 || TRACY_HAS_CALLSTACK == 3 || TRACY_HAS_CALLSTACK == 6
+#if TRACY_HAS_CALLSTACK == 2 || TRACY_HAS_CALLSTACK == 3 || TRACY_HAS_CALLSTACK == 4 || TRACY_HAS_CALLSTACK == 6
 #  include "libbacktrace/alloc.cpp"
 #  include "libbacktrace/dwarf.cpp"
-#  include "libbacktrace/elf.cpp"
 #  include "libbacktrace/fileline.cpp"
 #  include "libbacktrace/mmapio.cpp"
 #  include "libbacktrace/posix.cpp"
 #  include "libbacktrace/sort.cpp"
 #  include "libbacktrace/state.cpp"
+#  if TRACY_HAS_CALLSTACK == 4
+#    include "libbacktrace/macho.cpp"
+#  else
+#    include "libbacktrace/elf.cpp"
+#  endif
 #endif
 
 #ifdef _MSC_VER

client/TracyCallstack.cpp

@@ -17,11 +17,11 @@
 #  ifdef _MSC_VER
 #    pragma warning( pop )
 #  endif
-#elif TRACY_HAS_CALLSTACK == 2 || TRACY_HAS_CALLSTACK == 3 || TRACY_HAS_CALLSTACK == 6
+#elif TRACY_HAS_CALLSTACK == 2 || TRACY_HAS_CALLSTACK == 3 || TRACY_HAS_CALLSTACK == 4 || TRACY_HAS_CALLSTACK == 6
 #  include "../libbacktrace/backtrace.hpp"
 #  include <dlfcn.h>
 #  include <cxxabi.h>
-#elif TRACY_HAS_CALLSTACK == 4 || TRACY_HAS_CALLSTACK == 5
+#elif TRACY_HAS_CALLSTACK == 5
 #  include <dlfcn.h>
 #  include <cxxabi.h>
 #endif
@@ -193,126 +193,7 @@ CallstackEntryData DecodeCallstackPtr( uint64_t ptr )
     return { cb_data, uint8_t( cb_num ) };
 }
 
-#elif TRACY_HAS_CALLSTACK == 4
-
-void InitCallstack()
-{
-}
-
-const char* DecodeCallstackPtrFast( uint64_t ptr )
-{
-    static char ret[1024];
-    auto vptr = (void*)ptr;
-    char** sym = nullptr;
-    const char* symname = nullptr;
-    Dl_info dlinfo;
-    if( dladdr( vptr, &dlinfo ) && dlinfo.dli_sname )
-    {
-        symname = dlinfo.dli_sname;
-    }
-    else
-    {
-        sym = backtrace_symbols( &vptr, 1 );
-        if( sym )
-        {
-            symname = *sym;
-        }
-    }
-    if( symname )
-    {
-        strcpy( ret, symname );
-    }
-    else
-    {
-        *ret = '\0';
-    }
-    return ret;
-}
-
-CallstackEntryData DecodeCallstackPtr( uint64_t ptr )
-{
-    static CallstackEntry cb;
-    cb.line = 0;
-
-    char* demangled = nullptr;
-    const char* symname = nullptr;
-    const char* symloc = nullptr;
-    auto vptr = (void*)ptr;
-    char** sym = nullptr;
-    ptrdiff_t symoff = 0;
-
-    Dl_info dlinfo;
-    if( dladdr( vptr, &dlinfo ) )
-    {
-        symloc = dlinfo.dli_fname;
-        symname = dlinfo.dli_sname;
-        symoff = (char*)ptr - (char*)dlinfo.dli_saddr;
-
-        if( symname && symname[0] == '_' )
-        {
-            size_t len = 0;
-            int status;
-            demangled = abi::__cxa_demangle( symname, nullptr, &len, &status );
-            if( status == 0 )
-            {
-                symname = demangled;
-            }
-        }
-    }
-
-    if( !symname )
-    {
-        sym = backtrace_symbols( &vptr, 1 );
-        if( !sym )
-        {
-            symname = "[unknown]";
-        }
-        else
-        {
-            symname = *sym;
-        }
-    }
-    if( !symloc )
-    {
-        symloc = "[unknown]";
-    }
-
-    if( symoff == 0 )
-    {
-        const auto namelen = strlen( symname );
-        auto name = (char*)tracy_malloc( namelen + 1 );
-        memcpy( name, symname, namelen );
-        name[namelen] = '\0';
-        cb.name = name;
-    }
-    else
-    {
-        char buf[32];
-        const auto offlen = sprintf( buf, " + %td", symoff );
-        const auto namelen = strlen( symname );
-        auto name = (char*)tracy_malloc( namelen + offlen + 1 );
-        memcpy( name, symname, namelen );
-        memcpy( name + namelen, buf, offlen );
-        name[namelen + offlen] = '\0';
-        cb.name = name;
-    }
-
-    char buf[32];
-    const auto addrlen = sprintf( buf, " [%p]", (void*)ptr );
-    const auto loclen = strlen( symloc );
-    auto loc = (char*)tracy_malloc( loclen + addrlen + 1 );
-    memcpy( loc, symloc, loclen );
-    memcpy( loc + loclen, buf, addrlen );
-    loc[loclen + addrlen] = '\0';
-    cb.file = loc;
-
-    if( sym ) free( sym );
-    if( demangled ) free( demangled );
-
-    return { &cb, 1 };
-}
-
-#elif TRACY_HAS_CALLSTACK == 2 || TRACY_HAS_CALLSTACK == 3 || TRACY_HAS_CALLSTACK == 6
+#elif TRACY_HAS_CALLSTACK == 2 || TRACY_HAS_CALLSTACK == 3 || TRACY_HAS_CALLSTACK == 4 || TRACY_HAS_CALLSTACK == 6
 
 enum { MaxCbTrace = 16 };
 

libbacktrace/fileline.cpp

@@ -45,6 +45,10 @@ POSSIBILITY OF SUCH DAMAGE.  */
 #  include <limits.h>
 #endif
 
+#ifdef __APPLE__
+#  include <mach-o/dyld.h>
+#endif
+
 #include "backtrace.hpp"
 #include "internal.hpp"
 
@@ -73,10 +77,24 @@ getexecname(void)
   return rc ? NULL : execname;
 }
 #  endif
-#else
-#  ifndef HAVE_GETEXECNAME
+#endif
+
+#if !defined HAVE_GETEXECNAME && defined __APPLE__
+#  define HAVE_GETEXECNAME
+static char execname[PATH_MAX + 1];
+static const char *
+getexecname(void)
+{
+  uint32_t size = sizeof(execname);
+  if (_NSGetExecutablePath(execname, &size) == 0)
+    return execname;
+  else
+    return NULL;
+}
+#endif
+
+#ifndef HAVE_GETEXECNAME
 #  define getexecname() NULL
-#  endif
 #endif
 
 namespace tracy