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annotate gen/passes/StripExternals.cpp @ 1483:defafbabbe32

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Add a pass to strip the bodies of `available_externally` functions so string literals and `TypeInfo`s only referenced by them can be deleted by `-globaldce`.
author Frits van Bommel <fvbommel wxs.nl>
date Sun, 07 Jun 2009 16:00:13 +0200
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children 7cca8cf730de
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1483
defafbabbe32 Add a pass to strip the bodies of `available_externally` functions so string
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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 #include "gen/llvm-version.h"
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19
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20 #if LLVM_REV >= 68940
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21
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22
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23 #define DEBUG_TYPE "strip-externals"
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24
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25 #include "Passes.h"
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26
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27 #include "llvm/Module.h"
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28 #include "llvm/Pass.h"
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29 #include "llvm/ADT/Statistic.h"
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30 #include "llvm/Support/Compiler.h"
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31 #include "llvm/Support/Debug.h"
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32 using namespace llvm;
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33
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34 STATISTIC(NumFunctions, "Number of function bodies removed");
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35 STATISTIC(NumVariables, "Number of global initializers removed");
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36
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37 namespace {
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38 struct VISIBILITY_HIDDEN StripExternals : public ModulePass {
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39 static char ID; // Pass identification, replacement for typeid
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40 StripExternals() : ModulePass(&ID) {}
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41
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42 // run - Do the StripExternals pass on the specified module.
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43 //
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44 bool runOnModule(Module &M);
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45 };
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46 }
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47
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48 char StripExternals::ID = 0;
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49 static RegisterPass<StripExternals>
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50 X("strip-externals", "Strip available_externally bodies and initializers");
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51
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52 ModulePass *createStripExternalsPass() { return new StripExternals(); }
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53
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54 bool StripExternals::runOnModule(Module &M) {
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55 bool Changed = false;
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56
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57 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
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58 if (I->hasAvailableExternallyLinkage()) {
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59 assert(!I->isDeclaration()&&"Declarations can't be available_externally");
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60 Changed = true;
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61 ++NumFunctions;
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62 if (I->use_empty()) {
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63 DOUT << "Deleting function: " << *I;
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64 I->eraseFromParent();
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65 } else {
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66 I->deleteBody();
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67 DOUT << "Deleted function body: " << *I;
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68 }
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69 }
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70 }
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71
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72 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
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73 I != E; ++I) {
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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 DOUT << "Deleting global: " << *I;
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80 I->eraseFromParent();
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81 } else {
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82 I->setInitializer(0);
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83 I->setLinkage(GlobalValue::ExternalLinkage);
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84 DOUT << "Deleted initializer: " << *I;
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85 }
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86 }
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87 }
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88
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89 return Changed;
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90 }
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91
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92 #endif //LLVM_REV >= 68940