[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

2 files changed, 28 insertions, 2 deletions

diff --git a/lib/esan/cache_frag.cpp b/lib/esan/cache_frag.cpp
index 1ab8699b9..da168dc0c 100644
--- a/lib/esan/cache_frag.cpp
+++ b/lib/esan/cache_frag.cpp
@@ -16,14 +16,34 @@
 
 namespace __esan {
 
+// This should be kept consistent with LLVM's EfficiencySanitizer StructInfo.
+struct StructInfo {
+  const char *StructName;
+  u32 NumOfFields;
+  u64 *FieldCounters;
+  const char **FieldTypeNames;
+};
+
+// This should be kept consistent with LLVM's EfficiencySanitizer CacheFragInfo.
+// The tool-specific information per compilation unit (module).
+struct CacheFragInfo {
+  const char *UnitName;
+  u32 NumOfStructs;
+  StructInfo *Structs;
+};
+
 //===-- Init/exit functions -----------------------------------------------===//
 
 void processCacheFragCompilationUnitInit(void *Ptr) {
-  VPrintf(2, "in esan::%s\n", __FUNCTION__);
+  CacheFragInfo *CacheFrag = (CacheFragInfo *)Ptr;
+  VPrintf(2, "in esan::%s: %s with %u class(es)/struct(s)\n",
+          __FUNCTION__, CacheFrag->UnitName, CacheFrag->NumOfStructs);
 }
 
 void processCacheFragCompilationUnitExit(void *Ptr) {
-  VPrintf(2, "in esan::%s\n", __FUNCTION__);
+  CacheFragInfo *CacheFrag = (CacheFragInfo *)Ptr;
+  VPrintf(2, "in esan::%s: %s with %u class(es)/struct(s)\n",
+          __FUNCTION__, CacheFrag->UnitName, CacheFrag->NumOfStructs);
 }
 
 void initializeCacheFrag() {
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);
   }
 }