1 files changed, 84 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/NVPTX/NVPTXAssignValidGlobalNames.cpp b/contrib/llvm/lib/Target/NVPTX/NVPTXAssignValidGlobalNames.cpp
new file mode 100644
index 000000000000..7d4be8e809cf
--- /dev/null
+++ b/contrib/llvm/lib/Target/NVPTX/NVPTXAssignValidGlobalNames.cpp
@@ -0,0 +1,84 @@
+//===-- NVPTXAssignValidGlobalNames.cpp - Assign valid names to globals ---===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Clean up the names of global variables in the module to not contain symbols
+// that are invalid in PTX.
+//
+// Currently NVPTX, like other backends, relies on generic symbol name
+// sanitizing done by MC. However, the ptxas assembler is more stringent and
+// disallows some additional characters in symbol names. This pass makes sure
+// such names do not reach MC at all.
+//
+//===----------------------------------------------------------------------===//
+
+#include "NVPTX.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/LegacyPassManager.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/raw_ostream.h"
+#include <string>
+
+using namespace llvm;
+
+namespace {
+/// \brief NVPTXAssignValidGlobalNames
+class NVPTXAssignValidGlobalNames : public ModulePass {
+public:
+  static char ID;
+  NVPTXAssignValidGlobalNames() : ModulePass(ID) {}
+
+  bool runOnModule(Module &M) override;
+
+  /// \brief Clean up the name to remove symbols invalid in PTX.
+  std::string cleanUpName(StringRef Name);
+};
+}
+
+char NVPTXAssignValidGlobalNames::ID = 0;
+
+namespace llvm {
+void initializeNVPTXAssignValidGlobalNamesPass(PassRegistry &);
+}
+
+INITIALIZE_PASS(NVPTXAssignValidGlobalNames, "nvptx-assign-valid-global-names",
+                "Assign valid PTX names to globals", false, false)
+
+bool NVPTXAssignValidGlobalNames::runOnModule(Module &M) {
+  for (GlobalVariable &GV : M.globals()) {
+    // We are only allowed to rename local symbols.
+    if (GV.hasLocalLinkage()) {
+      // setName doesn't do extra work if the name does not change.
+      // Note: this does not create collisions - if setName is asked to set the
+      // name to something that already exists, it adds a proper postfix to
+      // avoid collisions.
+      GV.setName(cleanUpName(GV.getName()));
+    }
+  }
+
+  return true;
+}
+
+std::string NVPTXAssignValidGlobalNames::cleanUpName(StringRef Name) {
+  std::string ValidName;
+  raw_string_ostream ValidNameStream(ValidName);
+  for (unsigned I = 0, E = Name.size(); I != E; ++I) {
+    char C = Name[I];
+    if (C == '.' || C == '@') {
+      ValidNameStream << "_$_";
+    } else {
+      ValidNameStream << C;
+    }
+  }
+
+  return ValidNameStream.str();
+}
+
+ModulePass *llvm::createNVPTXAssignValidGlobalNamesPass() {
+  return new NVPTXAssignValidGlobalNames();
+}