tests: unw_init_local_signal test

.gitignore

@@ -66,6 +66,7 @@ tests/test-static-link
 tests/[GL]test-trace
 tests/[GL]perf-trace
 tests/Ltest-cxx-exceptions
+tests/Ltest-init-local-signal
 tests/[GL]ia64-test-nat
 tests/[GL]ia64-test-rbs
 tests/[GL]ia64-test-readonly

tests/Ltest-init-local-signal-lib.c

@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+/* To prevent inlining and optimizing away */
+int foo(int* f) {
+  return *f;
+}

tests/Ltest-init-local-signal.c

@@ -0,0 +1,57 @@
+#include "libunwind.h"
+#include <sys/types.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <stdlib.h>
+
+#include <signal.h>
+#include <stdio.h>
+#include <assert.h>
+
+int stepper(unw_cursor_t* c) {
+  int steps = 0;
+  int ret = 1;
+  while (ret) {
+
+    ret = unw_step(c);
+    if (!ret) {
+      break;
+    }
+    steps++;
+  }
+  return steps;
+}
+
+/* Verify that we can step from both ucontext, and from getcontext()
+ * roughly the same.  This tests that the IP from ucontext is used
+ * correctly (see impl of unw_init_local_signal) */
+void handler(int num, siginfo_t* info, void* ucontext) {
+  unw_cursor_t c;
+  unw_context_t context;
+  unw_getcontext(&context);
+  int ret = unw_init_local_signal(&c, ucontext);
+  assert(!ret);
+  int ucontext_steps = stepper(&c);
+
+  ret = unw_init_local(&c, &context);
+  assert(!ret);
+  int getcontext_steps = stepper(&c);
+  if (ucontext_steps == getcontext_steps - 2) {
+    exit(0);
+  }
+  printf("unw_getcontext steps was %i, ucontext steps was %i, should be %i\n",
+	 getcontext_steps, ucontext_steps, getcontext_steps - 2);
+  exit(-1);
+}
+
+int foo(int* f);
+
+int main(){
+  struct sigaction a;
+  memset(&a, 0, sizeof(struct sigaction));
+  a.sa_sigaction = &handler;
+  sigaction(SIGSEGV, &a, NULL);
+
+  foo(NULL);
+}

tests/Makefile.am

@@ -45,6 +45,7 @@ endif #!ARCH_IA64
 			Gtest-resume-sig Ltest-resume-sig		 \
 			Gtest-resume-sig-rt Ltest-resume-sig-rt		 \
 			Gtest-trace Ltest-trace				 \
+			Ltest-init-local-signal				 \
 			test-async-sig test-flush-cache test-init-remote \
 			test-mem Ltest-varargs Ltest-nomalloc	 \
 			Ltest-nocalloc Lrs-race
@@ -134,6 +135,8 @@ Gtest_init_SOURCES = Gtest-init.cxx
 Ltest_init_SOURCES = Ltest-init.cxx
 Ltest_cxx_exceptions_SOURCES = Ltest-cxx-exceptions.cxx
 
+Ltest_init_local_signal_SOURCES = Ltest-init-local-signal.c Ltest-init-local-signal-lib.c
+
 Gtest_dyn1_SOURCES = Gtest-dyn1.c flush-cache.S flush-cache.h
 Ltest_dyn1_SOURCES = Ltest-dyn1.c flush-cache.S flush-cache.h
 test_static_link_SOURCES = test-static-link-loc.c test-static-link-gen.c
@@ -174,6 +177,7 @@ test_static_link_LDADD = $(LIBUNWIND)
 test_strerror_LDADD = $(LIBUNWIND)
 Lrs_race_LDADD = $(LIBUNWIND_local) -lpthread
 Ltest_varargs_LDADD = $(LIBUNWIND_local)
+Ltest_init_local_signal_LDADD = $(LIBUNWIND)
 
 Gtest_bt_LDADD = $(LIBUNWIND) $(LIBUNWIND_local)
 Gtest_concurrent_LDADD = $(LIBUNWIND) $(LIBUNWIND_local) -lpthread