Changeset 7416d46a for src/libcfa/interpose.c

Timestamp:

Jan 30, 2018, 3:54:32 PM (8 years ago)

Author:

Thierry Delisle <tdelisle@…>

Branches:

ADT, aaron-thesis, arm-eh, ast-experimental, cleanup-dtors, deferred_resn, demangler, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, new-env, no_list, persistent-indexer, pthread-emulation, qualifiedEnum, resolv-new, with_gc

Children:

633a642

Parents:

f792cb8 (diff), 42be3c3 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge branch 'master' of plg.uwaterloo.ca:software/cfa/cfa-cc

File:

• src/libcfa/interpose.c (modified) (3 diffs)

src/libcfa/interpose.c

@@ -22 +22 @@
 #include <dlfcn.h>
 #include <unistd.h>
+#define __USE_GNU
+#include <signal.h>
+#undef __USE_GNU
+#include <execinfo.h>
 }
 
 #include "bits/debug.h"
 #include "bits/defs.h"
+#include "bits/signal.h"
 #include "startup.h"
 
-void interpose_startup(void)  __attribute__(( constructor( STARTUP_PRIORITY_CORE ) ));
+void __cfaabi_interpose_startup(void)  __attribute__(( constructor( STARTUP_PRIORITY_CORE ) ));
 
 typedef void (*generic_fptr_t)(void);
@@ -84 +89 @@
 #define INIT_REALRTN( x, ver ) assign_ptr( (void**)&libc_##x, #x, ver)
 
-void interpose_startup() {
+void sigHandler_segv ( __CFA_SIGPARMS__ );
+void sigHandler_abort( __CFA_SIGPARMS__ );
+
+void __cfaabi_interpose_startup() {
         const char *version = NULL;
 
         INIT_REALRTN( abort, version );
         INIT_REALRTN( exit, version );
-}
+
+        __kernel_sigaction( SIGSEGV, sigHandler_segv , SA_SIGINFO );      // Failure handler
+        __kernel_sigaction( SIGBUS , sigHandler_segv , SA_SIGINFO );      // Failure handler
+        __kernel_sigaction( SIGABRT, sigHandler_abort, SA_SIGINFO );      // Failure handler
+}
+
+//=============================================================================================
+// Terminating Signals logic
+//=============================================================================================
 
 extern "C" {
@@ -137 +153 @@
                 libc_abort();
         }
+}
+
+// skip first 6 stack frames by default
+static void __kernel_backtrace() {
+        // skip first N stack frames
+        int start = 6;
+
+        enum { Frames = 50 };
+        void * array[Frames];
+        int size = backtrace( array, Frames );
+        char ** messages = backtrace_symbols( array, size );
+
+        // find executable name
+        *index( messages[0], '(' ) = '\0';
+        __cfaabi_dbg_bits_print_nolock( "Stack back trace for: %s\n", messages[0]);
+
+        // skip last 2 stack frames after main
+        for ( int i = start; i < size && messages != NULL; i += 1 ) {
+                char * name = NULL;
+                char * offset_begin = NULL;
+                char * offset_end = NULL;
+
+                for ( char *p = messages[i]; *p; ++p ) {
+                        // find parantheses and +offset
+                        if ( *p == '(' ) {
+                                name = p;
+                        }
+                        else if ( *p == '+' ) {
+                                offset_begin = p;
+                        }
+                        else if ( *p == ')' ) {
+                                offset_end = p;
+                                break;
+                        }
+                }
+
+                // if line contains symbol print it
+                int frameNo = i - start;
+                if ( name && offset_begin && offset_end && name < offset_begin ) {
+                        // delimit strings
+                        *name++ = '\0';
+                        *offset_begin++ = '\0';
+                        *offset_end++ = '\0';
+
+                        __cfaabi_dbg_bits_print_nolock( "(%i) %s : %s + %s %s\n", frameNo, messages[i], name, offset_begin, offset_end);
+                }
+                // otherwise, print the whole line
+                else {
+                        __cfaabi_dbg_bits_print_nolock( "(%i) %s\n", frameNo, messages[i] );
+                }
+        }
+
+        free( messages );
+}
+
+void sigHandler_segv( __CFA_SIGPARMS__ ) {
+        // skip first only 1 stack frames in case of segfault.
+        abortf( "*CFA runtime error* program cfa-cpp terminated with %s\n", sig == SIGSEGV ? "segment fault." : "bus error." );
+}
+
+void sigHandler_abort( __CFA_SIGPARMS__ ) {
+        __kernel_backtrace();
+
+        // reset default signal handler
+        __kernel_sigdefault( SIGABRT );
+
+        raise( SIGABRT );
 }