Bury leaked pointers in a global array to silence a leak detector in --disable-free mode
Summary:
This is an alternative to http://llvm-reviews.chandlerc.com/D2475
suggested by Chandler.
Reviewers: chandlerc, rnk, dblaikie
CC: cfe-commits, earthdok
Differential Revision: http://llvm-reviews.chandlerc.com/D2478
llvm-svn: 198073
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 71e6b74..78a88f6 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -28,6 +28,7 @@
#include "llvm/Option/ArgList.h"
#include "llvm/Option/OptTable.h"
#include "llvm/Option/Option.h"
+#include "llvm/Support/Atomic.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Host.h"
@@ -1827,4 +1828,19 @@
}
return Res;
}
+
+void BuryPointer(const void *Ptr) {
+ // This function may be called only a small fixed amount of times per each
+ // invocation, otherwise we do actually have a leak which we want to report.
+ // If this function is called more than kGraveYardMaxSize times, the pointers
+ // will not be properly buried and a leak detector will report a leak, which
+ // is what we want in such case.
+ static const size_t kGraveYardMaxSize = 16;
+ static const void *GraveYard[kGraveYardMaxSize];
+ static llvm::sys::cas_flag GraveYardSize;
+ llvm::sys::cas_flag Idx = llvm::sys::AtomicIncrement(&GraveYardSize) - 1;
+ if (Idx >= kGraveYardMaxSize)
+ return;
+ GraveYard[Idx] = Ptr;
+}
}