| //===- SymbolStripping.cpp - Strip symbols for functions and modules ------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements stripping symbols out of symbol tables. |
| // |
| // Specifically, this allows you to strip all of the symbols out of: |
| // * All functions in a module |
| // * All non-essential symbols in a module (all function symbols + all module |
| // scope symbols) |
| // |
| // Notice that: |
| // * This pass makes code much less readable, so it should only be used in |
| // situations where the 'strip' utility would be used (such as reducing |
| // code size, and making it harder to reverse engineer code). |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Transforms/Scalar.h" |
| #include "llvm/Module.h" |
| #include "llvm/SymbolTable.h" |
| #include "llvm/Pass.h" |
| using namespace llvm; |
| |
| namespace { |
| struct SymbolStripping : public FunctionPass { |
| virtual bool runOnFunction(Function &F) { |
| return F.getSymbolTable().strip(); |
| } |
| virtual void getAnalysisUsage(AnalysisUsage &AU) const { |
| AU.setPreservesAll(); |
| } |
| }; |
| RegisterOpt<SymbolStripping> X("strip", "Strip symbols from functions"); |
| |
| struct FullSymbolStripping : public SymbolStripping { |
| virtual bool doInitialization(Module &M) { |
| return M.getSymbolTable().strip(); |
| } |
| }; |
| RegisterOpt<FullSymbolStripping> Y("mstrip", |
| "Strip symbols from module and functions"); |
| } |
| |
| Pass *llvm::createSymbolStrippingPass() { |
| return new SymbolStripping(); |
| } |
| |
| Pass *llvm::createFullSymbolStrippingPass() { |
| return new FullSymbolStripping(); |
| } |