Reconstruct partial stack traces for fatal errors. (#13238)

* Reconstruct partial stack traces for fatal errors.

* tweak to fatal error breadcrumb

* Add docs + fix test.

* Add fatal error test and improve fatal error stack trace a bit.

* fix test on travis

1 files changed, 57 insertions, 0 deletions

diff --git a/tests/resources/trigger-fatal.php b/tests/resources/trigger-fatal.php
new file mode 100644
index 0000000000..973622e6e0
--- /dev/null
+++ b/tests/resources/trigger-fatal.php
@@ -0,0 +1,57 @@
+<?php
+
+define('PIWIK_PRINT_ERROR_BACKTRACE', true);
+define('PIWIK_ENABLE_DISPATCH', false);
+
+require_once __DIR__ . '/../../tests/PHPUnit/proxy/index.php';
+
+$environment = new \Piwik\Application\Environment(null);
+$environment->init();
+
+\Piwik\Access::getInstance()->setSuperUserAccess(true);
+
+class MyClass
+{
+    public function triggerError()
+    {
+        try {
+            \Piwik\ErrorHandler::pushFatalErrorBreadcrumb(static::class);
+
+            $val = "";
+            while (true) {
+                $val .= str_repeat("*", 1024 * 1024 * 1024);
+            }
+        } finally {
+            \Piwik\ErrorHandler::popFatalErrorBreadcrumb();
+        }
+    }
+
+    public static function staticMethod()
+    {
+        try {
+            \Piwik\ErrorHandler::pushFatalErrorBreadcrumb(static::class);
+
+            $instance = new MyClass();
+            $instance->triggerError();
+        } finally {
+            \Piwik\ErrorHandler::popFatalErrorBreadcrumb();
+        }
+    }
+}
+
+class MyDerivedClass extends MyClass
+{
+}
+
+function myFunction()
+{
+    try {
+        \Piwik\ErrorHandler::pushFatalErrorBreadcrumb();
+
+        MyDerivedClass::staticMethod();
+    } finally {
+        \Piwik\ErrorHandler::popFatalErrorBreadcrumb();
+    }
+}
+
+myFunction();