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annotate lib/Target/NVPTX/NVPTXAssignValidGlobalNames.cpp @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 60c9769439b8
children 3a76565eade5
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1 //===-- NVPTXAssignValidGlobalNames.cpp - Assign valid names to globals ---===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // Clean up the names of global variables in the module to not contain symbols
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11 // that are invalid in PTX.
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12 //
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13 // Currently NVPTX, like other backends, relies on generic symbol name
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14 // sanitizing done by MC. However, the ptxas assembler is more stringent and
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15 // disallows some additional characters in symbol names. This pass makes sure
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16 // such names do not reach MC at all.
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17 //
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18 //===----------------------------------------------------------------------===//
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19
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20 #include "NVPTX.h"
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21 #include "llvm/IR/GlobalVariable.h"
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22 #include "llvm/IR/LegacyPassManager.h"
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23 #include "llvm/IR/Module.h"
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24 #include "llvm/Support/raw_ostream.h"
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25 #include <string>
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26
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27 using namespace llvm;
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28
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29 namespace {
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30 /// \brief NVPTXAssignValidGlobalNames
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31 class NVPTXAssignValidGlobalNames : public ModulePass {
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32 public:
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33 static char ID;
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34 NVPTXAssignValidGlobalNames() : ModulePass(ID) {}
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35
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36 bool runOnModule(Module &M) override;
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37
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38 /// \brief Clean up the name to remove symbols invalid in PTX.
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39 std::string cleanUpName(StringRef Name);
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40 };
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41 }
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42
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43 char NVPTXAssignValidGlobalNames::ID = 0;
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44
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45 namespace llvm {
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46 void initializeNVPTXAssignValidGlobalNamesPass(PassRegistry &);
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47 }
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48
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49 INITIALIZE_PASS(NVPTXAssignValidGlobalNames, "nvptx-assign-valid-global-names",
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50 "Assign valid PTX names to globals", false, false)
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51
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52 bool NVPTXAssignValidGlobalNames::runOnModule(Module &M) {
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53 for (GlobalVariable &GV : M.globals()) {
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54 // We are only allowed to rename local symbols.
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55 if (GV.hasLocalLinkage()) {
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56 // setName doesn't do extra work if the name does not change.
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57 // Note: this does not create collisions - if setName is asked to set the
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58 // name to something that already exists, it adds a proper postfix to
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59 // avoid collisions.
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60 GV.setName(cleanUpName(GV.getName()));
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61 }
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62 }
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63
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64 return true;
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65 }
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66
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67 std::string NVPTXAssignValidGlobalNames::cleanUpName(StringRef Name) {
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68 std::string ValidName;
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69 raw_string_ostream ValidNameStream(ValidName);
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70 for (unsigned I = 0, E = Name.size(); I != E; ++I) {
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71 char C = Name[I];
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72 if (C == '.' || C == '@') {
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73 ValidNameStream << "_$_";
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74 } else {
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75 ValidNameStream << C;
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76 }
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77 }
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78
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79 return ValidNameStream.str();
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80 }
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81
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82 ModulePass *llvm::createNVPTXAssignValidGlobalNamesPass() {
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83 return new NVPTXAssignValidGlobalNames();
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84 }