llvm/llvm/lib/Transforms/IPO/StripSymbols.cpp

//===- StripSymbols.cpp - Strip symbols and debug info from a module ------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// The StripSymbols transformation implements code stripping. Specifically, it
// can delete:
//
//   * names for virtual registers
//   * symbols for internal globals and functions
//   * debug information
//
// Note that this transformation 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 or making it harder to reverse engineer code.
//
//===----------------------------------------------------------------------===//

#include "llvm/Transforms/IPO/StripSymbols.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/TypeFinder.h"
#include "llvm/IR/ValueSymbolTable.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/IPO/StripSymbols.h"
#include "llvm/Transforms/Utils/Local.h"

usingnamespacellvm;

static cl::opt<bool>
    StripGlobalConstants("strip-global-constants", cl::init(false), cl::Hidden,
                         cl::desc("Removes debug compile units which reference "
                                  "to non-existing global constants"));

/// OnlyUsedBy - Return true if V is only used by Usr.
static bool OnlyUsedBy(Value *V, Value *Usr) { … }

static void RemoveDeadConstant(Constant *C) { … }

// Strip the symbol table of its names.
//
static void StripSymtab(ValueSymbolTable &ST, bool PreserveDbgInfo) { … }

// Strip any named types of their names.
static void StripTypeNames(Module &M, bool PreserveDbgInfo) { … }

/// Find values that are marked as llvm.used.
static void findUsedValues(GlobalVariable *LLVMUsed,
                           SmallPtrSetImpl<const GlobalValue*> &UsedValues) { … }

/// StripSymbolNames - Strip symbol names.
static bool StripSymbolNames(Module &M, bool PreserveDbgInfo) { … }

static bool stripDebugDeclareImpl(Module &M) { … }

static bool stripDeadDebugInfoImpl(Module &M) { … }

PreservedAnalyses StripSymbolsPass::run(Module &M, ModuleAnalysisManager &AM) { … }

PreservedAnalyses StripNonDebugSymbolsPass::run(Module &M,
                                                ModuleAnalysisManager &AM) { … }

PreservedAnalyses StripDebugDeclarePass::run(Module &M,
                                             ModuleAnalysisManager &AM) { … }

PreservedAnalyses StripDeadDebugInfoPass::run(Module &M,
                                              ModuleAnalysisManager &AM) { … }