Fix makefile race condition

[riscv-isa-sim.git] / spike / extensions.cc

diff --git a/spike/extensions.cc b/spike/extensions.cc
index 0d22a95d932f956a4a91fe5055a11b0f7f018e9f..315621fd86fbbb93822bc00763b7eecc2670585e 100644 (file)
--- a/spike/extensions.cc
+++ b/spike/extensions.cc
@@ -1,14 +1,35 @@
 #include "extension.h"
-#include "hwacha.h"
-#include "dummy-rocc.h"
+#include <string>
+#include <map>
+#include <dlfcn.h>
 
-REGISTER_EXTENSION(dummy, []() { return new dummy_rocc_t; })
-REGISTER_EXTENSION(hwacha, []() { return new hwacha_t; })
-
-// Static constructors want to make use of the extensions map, so we
-// access it through a function call to guarantee initialization order.
-std::map<std::string, std::function<extension_t*()>>& extensions()
+static std::map<std::string, std::function<extension_t*()>>& extensions()
 {
   static std::map<std::string, std::function<extension_t*()>> v;
   return v;
 }
+
+void register_extension(const char* name, std::function<extension_t*()> f)
+{
+  extensions()[name] = f;
+}
+
+std::function<extension_t*()> find_extension(const char* name)
+{
+  if (!extensions().count(name)) {
+    // try to find extension xyz by loading libxyz.so
+    std::string libname = std::string("lib") + name + ".so";
+    if (!dlopen(libname.c_str(), RTLD_LAZY)) {
+      fprintf(stderr, "couldn't find extension '%s' (or library '%s')\n",
+              name, libname.c_str());
+      exit(-1);
+    }
+    if (!extensions().count(name)) {
+      fprintf(stderr, "couldn't find extension '%s' in shared library '%s'\n",
+              name, libname.c_str());
+      exit(-1);
+    }
+  }
+
+  return extensions()[name];
+}