[PATCH] [ASan] Support the asan_loadN/asan_storeN functions in the DLL thunk library

[Ehsan Akhgari]

Hi timurrrr,

This is required for linking DLLs with large functions exceeding
san-instrumentation-with-call-threshold.  One such function is
vp9_fdct16x16_sse2 in libvpx.

http://reviews.llvm.org/D4758

Files:
  lib/asan/asan_dll_thunk.cc
  test/asan/TestCases/Windows/dll_large_function.cc

Index: lib/asan/asan_dll_thunk.cc
===================================================================
--- lib/asan/asan_dll_thunk.cc
+++ lib/asan/asan_dll_thunk.cc
@@ -235,6 +235,20 @@
 INTERFACE_FUNCTION(__asan_report_load16)
 INTERFACE_FUNCTION(__asan_report_load_n)
 
+INTERFACE_FUNCTION(__asan_store1)
+INTERFACE_FUNCTION(__asan_store2)
+INTERFACE_FUNCTION(__asan_store4)
+INTERFACE_FUNCTION(__asan_store8)
+INTERFACE_FUNCTION(__asan_store16)
+INTERFACE_FUNCTION(__asan_storeN)
+
+INTERFACE_FUNCTION(__asan_load1)
+INTERFACE_FUNCTION(__asan_load2)
+INTERFACE_FUNCTION(__asan_load4)
+INTERFACE_FUNCTION(__asan_load8)
+INTERFACE_FUNCTION(__asan_load16)
+INTERFACE_FUNCTION(__asan_loadN)
+
 INTERFACE_FUNCTION(__asan_memcpy);
 INTERFACE_FUNCTION(__asan_memset);
 INTERFACE_FUNCTION(__asan_memmove);
Index: test/asan/TestCases/Windows/dll_large_function.cc
===================================================================
--- /dev/null
+++ test/asan/TestCases/Windows/dll_large_function.cc
@@ -0,0 +1,11 @@
+// Make sure we can link a DLL with large functions which would mean
+// functions such as __asan_loadN and __asan_storeN will be called
+// from the DLL.  We simulate the large function with
+// -mllvm -asan-instrumentation-with-call-threshold=0.
+// RUN: %clang_cl_asan %s -c -Fo%t.obj -mllvm -asan-instrumentation-with-call-threshold=0
+// RUN: link /nologo /DLL /OUT:%t.dll %t.obj %asan_dll_thunk
+
+void f(long* foo, long* bar) {
+  // One load and one store
+  *foo = *bar;
+}
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