Reduce stack usage for overflow checks

This reduces the stack space reserved for overflow checks to 12K, split
into an 8K gap and a 4K protected region.  GC needs over 8K when running
in a stack overflow situation.

Also prevents signal runaway by detecting a signal inside code that
resulted from a signal handler invokation.  And adds a max signal count to
the SignalTest to prevent it running forever.

Also reduces the number of iterations for the InterfaceTest as this was
taking (almost) forever with the --trace option on run-test.

Bug: 15435566

Change-Id: Id4fd46f22d52d42a9eb431ca07948673e8fda694

2 files changed, 10 insertions, 2 deletions

diff --git a/test/004-InterfaceTest/src/Main.java b/test/004-InterfaceTest/src/Main.java
index 9ebac59..297cbb0 100644
--- a/test/004-InterfaceTest/src/Main.java
+++ b/test/004-InterfaceTest/src/Main.java
@@ -23,7 +23,7 @@ public class Main {
     Integer intobj = new Integer(0);
     String s = "asdf";
     long start = System.currentTimeMillis();
-    for (int i = 0; i < 1000000; i++) {
+    for (int i = 0; i < 10000; i++) {
         map.put(intobj, s);
     }
     long end = System.currentTimeMillis();
@@ -34,7 +34,7 @@ public class Main {
     Integer intobj = new Integer(0);
     String s = "asdf";
     long start = System.currentTimeMillis();
-    for (int i = 0; i < 1000000; i++) {
+    for (int i = 0; i < 10000; i++) {
         map.put(intobj, s);
     }
     long end = System.currentTimeMillis();
diff --git a/test/004-SignalTest/signaltest.cc b/test/004-SignalTest/signaltest.cc
index a2dd664..c05dc22 100644
--- a/test/004-SignalTest/signaltest.cc
+++ b/test/004-SignalTest/signaltest.cc
@@ -16,6 +16,7 @@
 
 #include <signal.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 
 #include "jni.h"
@@ -24,8 +25,15 @@
 #include <sys/ucontext.h>
 #endif
 
+static int signal_count;
+static const int kMaxSignal = 2;
+
 static void signalhandler(int sig, siginfo_t* info, void* context) {
   printf("signal caught\n");
+  ++signal_count;
+  if (signal_count > kMaxSignal) {
+     abort();
+  }
 #ifdef __arm__
   // On ARM we do a more exhaustive test to make sure the signal
   // context is OK.