Adding a collector name attribute to Function in the IR. These

methods are new to Function:

  bool hasCollector() const;
  const std::string &getCollector() const;
  void setCollector(const std::string &);
  void clearCollector();

The assembly representation is as such:

  define void @f() gc "shadow-stack" { ...

The implementation uses an on-the-side table to map Functions to 
collector names, such that there is no overhead. A StringPool is 
further used to unique collector names, which are extremely
likely to be unique per process.

llvm-svn: 44769

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/VMCore/AsmWriter.cpp b/llvm/lib/VMCore/AsmWriter.cpp
index ef8161b0334..008c1daee19 100644
--- a/llvm/lib/VMCore/AsmWriter.cpp
+++ b/llvm/lib/VMCore/AsmWriter.cpp
@@ -1112,6 +1112,8 @@ void AssemblyWriter::printFunction(const Function *F) {
     Out << " section \"" << F->getSection() << '"';
   if (F->getAlignment())
     Out << " align " << F->getAlignment();
+  if (F->hasCollector())
+    Out << " gc \"" << F->getCollector() << '"';
 
   if (F->isDeclaration()) {
     Out << "\n";