Bug 1063321 - Print to the console the paths of all files that DMD opens. r=mccr8.

--HG--
extra : rebase_source : 50a18a0a074f929ab934c5b3eade1c69e6ba4510

memory/replace/dmd/DMD.cpp

@@ -195,7 +195,7 @@ MallocSizeOf(const void* aPtr)
   return gMallocTable->malloc_usable_size(const_cast<void*>(aPtr));
 }
 
-static void
+MOZ_EXPORT void
 StatusMsg(const char* aFmt, ...)
 {
   va_list ap;

memory/replace/dmd/DMD.h

@@ -84,6 +84,10 @@ struct Sizes
 MOZ_EXPORT void
 SizeOf(Sizes* aSizes);
 
+// Prints a status message prefixed with "DMD[<pid>]". Use sparingly.
+MOZ_EXPORT void
+StatusMsg(const char* aFmt, ...);
+
 // Indicates whether or not DMD is running.
 MOZ_EXPORT bool
 IsRunning();

xpcom/base/nsMemoryInfoDumper.cpp

@@ -711,6 +711,15 @@ nsMemoryInfoDumper::OpenDMDFile(const nsAString& aIdentifier, int aPid,
   }
   rv = dmdFile->OpenANSIFileDesc("wb", aOutFile);
   NS_WARN_IF(NS_FAILED(rv));
+
+  // Print the path, because on some platforms (e.g. Mac) it's not obvious.
+  nsCString path;
+  rv = dmdFile->GetNativePath(path);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+  dmd::StatusMsg("opened %s for writing\n", path.get());
+
   return rv;
 }