add headers and implementation for <new>, <exception>, and <typeinfo>

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103795 91177308-0d34-0410-b5e6-96231b3b80d8

src/new.cpp

@@ -7,11 +7,136 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include <stdlib.h> 
+#include <cxxabi.h> 
+
 #include "new"
 
+
+#if __APPLE__
+    // On Darwin, there are two STL shared libraries and a lower level ABI
+	// shared libray.  The global holding the current new handler is
+    // in the ABI library and named __cxa_new_handler.
+    #define __new_handler __cxxabiapple::__cxa_new_handler
+#else
+	static std::new_handler __new_handler;
+#endif
+
+
+// Implement all new and delete operators as weak definitions
+// in this shared library, so that they can be overriden by programs
+// that define non-weak copies of the functions.
+
+
+__attribute__((__weak__, __visibility__("default")))
+void *
+operator new(std::size_t size) throw (std::bad_alloc)
+{
+    if (size == 0)
+        size = 1;
+    void* p;
+    while ((p = ::malloc(size)) == 0)
+    {
+		// If malloc fails and there is a new_handler, 
+		// call it to try free up memory.
+        if (__new_handler)
+            __new_handler();
+        else
+            throw std::bad_alloc();
+    }
+    return p;
+}
+
+__attribute__((__weak__, __visibility__("default")))
+void*
+operator new(size_t size, const std::nothrow_t&) throw()
+{
+    void* p = 0;
+    try
+    {
+        p = ::operator new(size);
+    }
+    catch (...)
+    {
+    }
+    return p;
+}
+
+__attribute__((__weak__, __visibility__("default")))
+void*
+operator new[](size_t size) throw (std::bad_alloc)
+{
+    return ::operator new(size);
+}
+
+__attribute__((__weak__, __visibility__("default")))
+void*
+operator new[](size_t size, const std::nothrow_t& nothrow) throw()
+{
+    void* p = 0;
+    try
+    {
+        p = ::operator new[](size);
+    }
+    catch (...)
+    {
+    }
+    return p;
+}
+
+__attribute__((__weak__, __visibility__("default")))
+void
+operator delete(void* ptr) throw ()
+{
+    if (ptr)
+        ::free(ptr);
+}
+
+__attribute__((__weak__, __visibility__("default")))
+void
+operator delete(void* ptr, const std::nothrow_t&) throw ()
+{
+    ::operator delete(ptr);
+}
+
+
+__attribute__((__weak__, __visibility__("default")))
+void
+operator delete[] (void* ptr) throw ()
+{
+    ::operator delete (ptr);
+}
+
+__attribute__((__weak__, __visibility__("default")))
+void
+operator delete[] (void* ptr, const std::nothrow_t&) throw ()
+{
+    ::operator delete[](ptr);
+}
+
+
 namespace std
 {
 
+bad_alloc::bad_alloc() throw() 
+{ 
+}
+
+bad_alloc::~bad_alloc() throw() 
+{ 
+}
+
+const char* 
+bad_alloc::what() const throw()
+{
+    return "std::bad_alloc";
+}
+
+
+bad_array_new_length::bad_array_new_length() throw()
+{
+}
+
 bad_array_new_length::~bad_array_new_length() throw()
 {
 }
@@ -22,6 +147,8 @@ bad_array_new_length::what() const throw()
     return "bad_array_new_length";
 }
 
+
+
 void
 __throw_bad_alloc()
 {