RuntimeLibrary: Add skeleton runtime library

Very basic runtime library.

Signed-off-by: Hyeonggon Yoo <[email protected]>

CMakeLists.txt

@@ -20,3 +20,4 @@ link_directories(${LLVM_LIBRARY_DIRS})
 
 # Our pass lives in this subdirectory.
 add_subdirectory(PreciseLeakSanitizer)
+add_subdirectory(RuntimeLibrary)

RuntimeLibrary/CMakeLists.txt

@@ -0,0 +1 @@
+add_library(plsan plsan.cpp)

RuntimeLibrary/plsan.cpp

@@ -0,0 +1,24 @@
+/* READ THIS:
+ * The name of a function here must start with double underscores to avoid
+ * collisons with the program. For example: __foo(), __bar(), etc.
+ */
+
+#include <cstddef>
+
+/* Initialization routines called before main() */
+__attribute__((constructor)) void __plsan_init() { /* TODO: */ }
+
+void __plsan_alloc(void *addr, size_t size) {
+  /* TODO: initialize references */
+}
+
+void __plsan_store(void **addr, void *value) { /* TODO: update references */ }
+
+void __plsan_exit_func() {
+  /*
+   *  TODO: check if
+   *  1) the address of lost meomry is written back to memory before
+   *     returning the function
+   *  2) or the address of a buffer is return value
+   */
+}