Limit size of non-GlobalValue name
Otherwise, in some extreme test case, very long names are created and the
compiler consumes large amount of memory. Size limit is set to a relatively
high value not to disturb debugging.
Compiler flag -non-global-value-max-name-size=<value> can be used to customize
the size.
Differential Revision: https://reviews.llvm.org/D41296
llvm-svn: 321886
diff --git a/llvm/lib/IR/Value.cpp b/llvm/lib/IR/Value.cpp
index 163c785..01b7aff 100644
--- a/llvm/lib/IR/Value.cpp
+++ b/llvm/lib/IR/Value.cpp
@@ -39,6 +39,10 @@
using namespace llvm;
+static cl::opt<unsigned> NonGlobalValueMaxNameSize(
+ "non-global-value-max-name-size", cl::Hidden, cl::init(1024),
+ cl::desc("Maximum size for the name of non-global values."));
+
//===----------------------------------------------------------------------===//
// Value Class
//===----------------------------------------------------------------------===//
@@ -244,6 +248,11 @@
if (getName() == NameRef)
return;
+ // Cap the size of non-GlobalValue names.
+ if (NameRef.size() > NonGlobalValueMaxNameSize && !isa<GlobalValue>(this))
+ NameRef =
+ NameRef.substr(0, std::max(1u, (unsigned)NonGlobalValueMaxNameSize));
+
assert(!getType()->isVoidTy() && "Cannot assign a name to void values!");
// Get the symbol table to update for this object.