[llvm] f0c2ffa - [msan] Add msan-insert-check DEBUG_COUNTER

[Vitaly Buka via llvm-commits]

Author: Vitaly Buka
Date: 2022-09-15T21:52:58-07:00
New Revision: f0c2ffa8f820fabb8b16f5ef81b7b2913eb19b36

URL: https://github.com/llvm/llvm-project/commit/f0c2ffa8f820fabb8b16f5ef81b7b2913eb19b36
DIFF: https://github.com/llvm/llvm-project/commit/f0c2ffa8f820fabb8b16f5ef81b7b2913eb19b36.diff

LOG: [msan] Add msan-insert-check DEBUG_COUNTER

Added: 
    

Modified: 
    llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp

Removed: 
    


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diff  --git a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
index a14a5cb944b0..d22f81c2f082 100644
--- a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
@@ -186,6 +186,7 @@
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
+#include "llvm/Support/DebugCounter.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/raw_ostream.h"
@@ -204,6 +205,9 @@ using namespace llvm;
 
 #define DEBUG_TYPE "msan"
 
+DEBUG_COUNTER(DebugInsertCheck, "msan-insert-check",
+              "Controls which checks to insert");
+
 static const unsigned kOriginSize = 4;
 static const Align kMinOriginAlignment = Align(4);
 static const Align kShadowTLSAlignment = Align(8);
@@ -1999,6 +2003,12 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
     assert(Shadow);
     if (!InsertChecks)
       return;
+
+    if (!DebugCounter::shouldExecute(DebugInsertCheck)) {
+      LLVM_DEBUG(dbgs() << "Skipping check of " << *Shadow << " before "
+                        << *OrigIns << "\n");
+      return;
+    }
 #ifndef NDEBUG
     Type *ShadowTy = Shadow->getType();
     assert((isa<IntegerType>(ShadowTy) || isa<VectorType>(ShadowTy) ||