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annotate gen/passes/StripExternals.cpp @ 1638:0de4525a9ed6

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Apply workaround for #395 by klickverbot.
author Christian Kamm <kamm incasoftware de>
date Mon, 08 Mar 2010 20:06:08 +0100
parents ed0feda76820
children
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1 //===-- StripExternals.cpp - Strip available_externally symbols -----------===//
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2 //
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3 // The LLVM D Compiler
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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 // This transform stips the bodies of available_externally functions and
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11 // initializers of available_externally globals, turning them into external
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12 // declarations.
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13 // This is useful to allow Global DCE (-globaldce) to clean up references to
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14 // globals only used by available_externally functions and initializers.
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15 //
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16 //===----------------------------------------------------------------------===//
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17
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18 #define DEBUG_TYPE "strip-externals"
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19
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20 #include "Passes.h"
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21
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22 #include "llvm/Module.h"
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23 #include "llvm/Pass.h"
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24 #include "llvm/ADT/Statistic.h"
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25 #include "llvm/Support/Compiler.h"
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26 #include "llvm/Support/Debug.h"
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27 #include "llvm/Support/raw_ostream.h"
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28 using namespace llvm;
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29
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30 STATISTIC(NumFunctions, "Number of function bodies removed");
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31 STATISTIC(NumVariables, "Number of global initializers removed");
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32
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33 namespace {
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34 struct VISIBILITY_HIDDEN StripExternals : public ModulePass {
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35 static char ID; // Pass identification, replacement for typeid
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36 StripExternals() : ModulePass(&ID) {}
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37
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38 // run - Do the StripExternals pass on the specified module.
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39 //
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40 bool runOnModule(Module &M);
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41 };
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42 }
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43
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44 char StripExternals::ID = 0;
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45 static RegisterPass<StripExternals>
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46 X("strip-externals", "Strip available_externally bodies and initializers");
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47
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48 ModulePass *createStripExternalsPass() { return new StripExternals(); }
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49
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50 bool StripExternals::runOnModule(Module &M) {
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51 bool Changed = false;
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52
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53 for (Module::iterator I = M.begin(); I != M.end(); ) {
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54 if (I->hasAvailableExternallyLinkage()) {
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55 assert(!I->isDeclaration()&&"Declarations can't be available_externally");
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56 Changed = true;
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57 ++NumFunctions;
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58 if (I->use_empty()) {
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59 DEBUG(errs() << "Deleting function: " << *I);
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60 Module::iterator todelete = I;
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61 ++I;
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62 todelete->eraseFromParent();
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63 continue;
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64 } else {
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65 I->deleteBody();
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66 DEBUG(errs() << "Deleted function body: " << *I);
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67 }
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68 }
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69 ++I;
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70 }
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71
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72 for (Module::global_iterator I = M.global_begin();
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73 I != M.global_end(); ) {
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74 if (I->hasAvailableExternallyLinkage()) {
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75 assert(!I->isDeclaration()&&"Declarations can't be available_externally");
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76 Changed = true;
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77 ++NumVariables;
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78 if (I->use_empty()) {
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79 DEBUG(errs() << "Deleting global: " << *I);
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80 Module::global_iterator todelete = I;
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81 ++I;
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82 todelete->eraseFromParent();
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83 continue;
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84 } else {
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85 I->setInitializer(0);
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86 I->setLinkage(GlobalValue::ExternalLinkage);
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87 DEBUG(errs() << "Deleted initializer: " << *I);
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88 }
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89 }
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90 ++I;
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91 }
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92
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93 return Changed;
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94 }