Changeset 293688 in webkit for trunk/Source/JavaScriptCore/jsc.cpp

Timestamp:

May 2, 2022, 3:33:52 PM (3 years ago)

Author:

Justin Michaud

Message:

Add option to JSC shell to wait for a USR2 signal before exiting to aid in collection of vmmaps
​https://bugs.webkit.org/show_bug.cgi?id=239919

Reviewed by Yusuke Suzuki.

Source/JavaScriptCore:

• jsc.cpp:

(main):

Source/WTF:

• wtf/threads/Signals.h:

(WTF::toSystemSignal):

File:

• trunk/Source/JavaScriptCore/jsc.cpp (modified) (3 diffs)

trunk/Source/JavaScriptCore/jsc.cpp

@@ -96 +96 @@
 #include <wtf/WallTime.h>
 #include <wtf/text/StringBuilder.h>
+#include <wtf/threads/BinarySemaphore.h>
 #include <wtf/threads/Signals.h>
 
@@ -3036 +3037 @@
 #endif
 
+#if OS(UNIX)
+    BinarySemaphore waitToExit;
+
+    if (getenv("JS_SHELL_WAIT_FOR_SIGUSR2_TO_EXIT")) {
+        addSignalHandler(Signal::Usr, SignalHandler([&] (Signal, SigInfo&, PlatformRegisters&) {
+            dataLogLn("Signal handler hit, we can exit now.");
+            waitToExit.signal();
+            return SignalAction::Handled;
+        }));
+        activateSignalHandlersFor(Signal::Usr);
+    }
+#endif
+
     // We can't use destructors in the following code because it uses Windows
     // Structured Exception Handling
@@ -3049 +3063 @@
         getc(stdin);
     }
+
+#if OS(UNIX)
+    if (getenv("JS_SHELL_WAIT_FOR_SIGUSR2_TO_EXIT")) {
+        WTF::fastDisableScavenger();
+        fprintf(stdout, "\njs shell waiting for `kill -USR2 [pid]` to exit\n");
+        fflush(stdout);
+
+        waitToExit.wait();
+
+        fprintf(stdout, "\njs shell exiting\n");
+        fflush(stdout);
+    }
+#endif
 
     jscExit(res);