[esan|cfrag] Add the skeleton to handle the cfrag argument

Summary:
Adds the struct declaration for the cache-fragmentation tool variable
passed to the runtime library.

Updates test struct-simple.cpp.

Reviewers: aizatsky, bruening

Subscribers: filcab, kubabrecka, bruening, kcc, vitalybuka, eugenis, llvm-commits, zhaoqin

Differential Revision: http://reviews.llvm.org/D20542

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@271337 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/esan/esan.cpp b/lib/esan/esan.cpp
index f0a496518..1f116da08 100644
--- a/lib/esan/esan.cpp
+++ b/lib/esan/esan.cpp
@@ -219,7 +219,10 @@ int finalizeLibrary() {
 void processCompilationUnitInit(void *Ptr) {
   VPrintf(2, "in esan::%s\n", __FUNCTION__);
   if (WhichTool == ESAN_CacheFrag) {
+    DCHECK(Ptr != nullptr);
     processCacheFragCompilationUnitInit(Ptr);
+  } else {
+    DCHECK(Ptr == nullptr);
   }
 }
 
@@ -228,7 +231,10 @@ void processCompilationUnitInit(void *Ptr) {
 void processCompilationUnitExit(void *Ptr) {
   VPrintf(2, "in esan::%s\n", __FUNCTION__);
   if (WhichTool == ESAN_CacheFrag) {
+    DCHECK(Ptr != nullptr);
     processCacheFragCompilationUnitExit(Ptr);
+  } else {
+    DCHECK(Ptr == nullptr);
   }
 }