1 //===-- NVPTXAssignValidGlobalNames.cpp - Assign valid names to globals ---===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Clean up the names of global variables in the module to not contain symbols
11 // that are invalid in PTX.
13 // Currently NVPTX, like other backends, relies on generic symbol name
14 // sanitizing done by MC. However, the ptxas assembler is more stringent and
15 // disallows some additional characters in symbol names. This pass makes sure
16 // such names do not reach MC at all.
18 //===----------------------------------------------------------------------===//
21 #include "llvm/IR/GlobalVariable.h"
22 #include "llvm/IR/Module.h"
23 #include "llvm/PassManager.h"
24 #include "llvm/Support/raw_ostream.h"
30 /// \brief NVPTXAssignValidGlobalNames
31 class NVPTXAssignValidGlobalNames : public ModulePass {
34 NVPTXAssignValidGlobalNames() : ModulePass(ID) {}
36 bool runOnModule(Module &M) override;
38 /// \brief Clean up the name to remove symbols invalid in PTX.
39 std::string cleanUpName(StringRef Name);
43 char NVPTXAssignValidGlobalNames::ID = 0;
46 void initializeNVPTXAssignValidGlobalNamesPass(PassRegistry &);
49 INITIALIZE_PASS(NVPTXAssignValidGlobalNames, "nvptx-assign-valid-global-names",
50 "Assign valid PTX names to globals", false, false)
52 bool NVPTXAssignValidGlobalNames::runOnModule(Module &M) {
53 for (GlobalVariable &GV : M.globals()) {
54 // We are only allowed to rename local symbols.
55 if (GV.hasLocalLinkage()) {
56 // setName doesn't do extra work if the name does not change.
57 // Note: this does not create collisions - if setName is asked to set the
58 // name to something that already exists, it adds a proper postfix to
60 GV.setName(cleanUpName(GV.getName()));
67 std::string NVPTXAssignValidGlobalNames::cleanUpName(StringRef Name) {
68 std::string ValidName;
69 raw_string_ostream ValidNameStream(ValidName);
70 for (unsigned I = 0, E = Name.size(); I != E; ++I) {
72 if (C == '.' || C == '@') {
73 ValidNameStream << "_$_";
79 return ValidNameStream.str();
82 ModulePass *llvm::createNVPTXAssignValidGlobalNamesPass() {
83 return new NVPTXAssignValidGlobalNames();