1 files changed, 76 insertions, 0 deletions
diff --git a/mozglue/baseprofiler/lul/platform-linux-lul.cpp b/mozglue/baseprofiler/lul/platform-linux-lul.cpp
new file mode 100644
index 0000000000..a9ee65858d
--- /dev/null
+++ b/mozglue/baseprofiler/lul/platform-linux-lul.cpp
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stdio.h>
+#include <signal.h>
+#include <string.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include "AutoObjectMapper.h"
+#include "BaseProfiler.h"
+#include "BaseProfilerSharedLibraries.h"
+#include "platform.h"
+#include "PlatformMacros.h"
+#include "LulMain.h"
+
+// Contains miscellaneous helpers that are used to connect the Gecko Profiler
+// and LUL.
+
+// Find out, in a platform-dependent way, where the code modules got
+// mapped in the process' virtual address space, and get |aLUL| to
+// load unwind info for them.
+void read_procmaps(lul::LUL* aLUL) {
+  MOZ_ASSERT(aLUL->CountMappings() == 0);
+
+#if defined(GP_OS_linux) || defined(GP_OS_android) || defined(GP_OS_freebsd)
+  SharedLibraryInfo info = SharedLibraryInfo::GetInfoForSelf();
+
+  for (size_t i = 0; i < info.GetSize(); i++) {
+    const SharedLibrary& lib = info.GetEntry(i);
+
+    std::string nativePath = lib.GetDebugPath();
+
+    // We can use the standard POSIX-based mapper.
+    AutoObjectMapperPOSIX mapper(aLUL->mLog);
+
+    // Ask |mapper| to map the object.  Then hand its mapped address
+    // to NotifyAfterMap().
+    void* image = nullptr;
+    size_t size = 0;
+    bool ok = mapper.Map(&image, &size, nativePath);
+    if (ok && image && size > 0) {
+      aLUL->NotifyAfterMap(lib.GetStart(), lib.GetEnd() - lib.GetStart(),
+                           nativePath.c_str(), image);
+    } else if (!ok && lib.GetDebugName().empty()) {
+      // The object has no name and (as a consequence) the mapper failed to map
+      // it.  This happens on Linux, where GetInfoForSelf() produces such a
+      // mapping for the VDSO.  This is a problem on x86-{linux,android} because
+      // lack of knowledge about the mapped area inhibits LUL's special
+      // __kernel_syscall handling.  Hence notify |aLUL| at least of the
+      // mapping, even though it can't read any unwind information for the area.
+      aLUL->NotifyExecutableArea(lib.GetStart(), lib.GetEnd() - lib.GetStart());
+    }
+
+    // |mapper| goes out of scope at this point and so its destructor
+    // unmaps the object.
+  }
+
+#else
+#  error "Unknown platform"
+#endif
+}
+
+// LUL needs a callback for its logging sink.
+void logging_sink_for_LUL(const char* str) {
+  // These are only printed when Verbose logging is enabled (e.g. with
+  // MOZ_BASE_PROFILER_VERBOSE_LOGGING=1). This is because LUL's logging is much
+  // more verbose than the rest of the profiler's logging, which occurs at the
+  // Info (3) and Debug (4) levels.
+  // FIXME: This causes a build failure in memory/replace/dmd/test/SmokeDMD (!)
+  // and other places, because it doesn't link the implementation in
+  // platform.cpp.
+  // VERBOSE_LOG("[%d] %s", profiler_current_process_id(), str);
+}