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📄 CanonicalizeAliases.h(998 B)
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📄 FunctionComparator.h(17.12 KB)
📄 FunctionImportUtils.h(5.73 KB)
📄 GlobalStatus.h(2.97 KB)
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📄 InjectTLIMappings.h(1.27 KB)
📄 IntegerDivision.h(2.88 KB)
📄 LCSSA.h(1.56 KB)
📄 LibCallsShrinkWrap.h(908 B)
📄 Local.h(24.77 KB)
📄 LoopRotationUtils.h(1.54 KB)
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📄 LoopUtils.h(21.25 KB)
📄 LoopVersioning.h(5.87 KB)
📄 LowerInvoke.h(1.08 KB)
📄 LowerMemIntrinsics.h(2.14 KB)
📄 Mem2Reg.h(921 B)
📄 MisExpect.h(1.81 KB)
📄 ModuleUtils.h(5.04 KB)
📄 NameAnonGlobals.h(1.03 KB)
📄 PredicateInfo.h(7.76 KB)
📄 PromoteMemToReg.h(1.57 KB)
📄 SSAUpdater.h(6.12 KB)
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📄 SSAUpdaterImpl.h(15.75 KB)
📄 SanitizerStats.h(1.53 KB)
📄 ScalarEvolutionExpander.h(17.87 KB)
📄 SimplifyIndVar.h(2.12 KB)
📄 SimplifyLibCalls.h(10.85 KB)
📄 SizeOpts.h(4.84 KB)
📄 SplitModule.h(1.53 KB)
📄 SymbolRewriter.h(5.02 KB)
📄 UnifyFunctionExitNodes.h(1.83 KB)
📄 UniqueInternalLinkageNames.h(1.07 KB)
📄 UnrollLoop.h(6.05 KB)
📄 VNCoercion.h(4.99 KB)
📄 ValueMapper.h(11.67 KB)

Editing: SymbolRewriter.h

//===- SymbolRewriter.h - Symbol Rewriting Pass -----------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file provides the prototypes and definitions related to the Symbol
// Rewriter pass.
//
// The Symbol Rewriter pass takes a set of rewrite descriptors which define
// transformations for symbol names.  These can be either single name to name
// trnsformation or more broad regular expression based transformations.
//
// All the functions are re-written at the IR level.  The Symbol Rewriter itself
// is exposed as a module level pass.  All symbols at the module level are
// iterated.  For any matching symbol, the requested transformation is applied,
// updating references to it as well (a la RAUW).  The resulting binary will
// only contain the rewritten symbols.
//
// By performing this operation in the compiler, we are able to catch symbols
// that would otherwise not be possible to catch (e.g. inlined symbols).
//
// This makes it possible to cleanly transform symbols without resorting to
// overly-complex macro tricks and the pre-processor.  An example of where this
// is useful is the sanitizers where we would like to intercept a well-defined
// set of functions across the module.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_TRANSFORMS_UTILS_SYMBOLREWRITER_H
#define LLVM_TRANSFORMS_UTILS_SYMBOLREWRITER_H

#include "llvm/IR/PassManager.h"
#include <list>
#include <memory>
#include <string>

namespace llvm {

class MemoryBuffer;
class Module;
class ModulePass;

namespace yaml {

class KeyValueNode;
class MappingNode;
class ScalarNode;
class Stream;

} // end namespace yaml

namespace SymbolRewriter {

/// The basic entity representing a rewrite operation.  It serves as the base
/// class for any rewrite descriptor.  It has a certain set of specializations
/// which describe a particular rewrite.
///
/// The RewriteMapParser can be used to parse a mapping file that provides the
/// mapping for rewriting the symbols.  The descriptors individually describe
/// whether to rewrite a function, global variable, or global alias.  Each of
/// these can be selected either by explicitly providing a name for the ones to
/// be rewritten or providing a (posix compatible) regular expression that will
/// select the symbols to rewrite.  This descriptor list is passed to the
/// SymbolRewriter pass.
class RewriteDescriptor {
public:
  enum class Type {
    Invalid,        /// invalid
    Function,       /// function - descriptor rewrites a function
    GlobalVariable, /// global variable - descriptor rewrites a global variable
    NamedAlias,     /// named alias - descriptor rewrites a global alias
  };

RewriteDescriptor(const RewriteDescriptor &) = delete;
  RewriteDescriptor &operator=(const RewriteDescriptor &) = delete;
  virtual ~RewriteDescriptor() = default;

Type getType() const { return Kind; }

virtual bool performOnModule(Module &M) = 0;

protected:
  explicit RewriteDescriptor(Type T) : Kind(T) {}

private:
  const Type Kind;
};

using RewriteDescriptorList = std::list<std::unique_ptr<RewriteDescriptor>>;

class RewriteMapParser {
public:
  bool parse(const std::string &MapFile, RewriteDescriptorList *Descriptors);

private:
  bool parse(std::unique_ptr<MemoryBuffer> &MapFile, RewriteDescriptorList *DL);
  bool parseEntry(yaml::Stream &Stream, yaml::KeyValueNode &Entry,
                  RewriteDescriptorList *DL);
  bool parseRewriteFunctionDescriptor(yaml::Stream &Stream,
                                      yaml::ScalarNode *Key,
                                      yaml::MappingNode *Value,
                                      RewriteDescriptorList *DL);
  bool parseRewriteGlobalVariableDescriptor(yaml::Stream &Stream,
                                            yaml::ScalarNode *Key,
                                            yaml::MappingNode *Value,
                                            RewriteDescriptorList *DL);
  bool parseRewriteGlobalAliasDescriptor(yaml::Stream &YS, yaml::ScalarNode *K,
                                         yaml::MappingNode *V,
                                         RewriteDescriptorList *DL);
};

} // end namespace SymbolRewriter

ModulePass *createRewriteSymbolsPass();
ModulePass *createRewriteSymbolsPass(SymbolRewriter::RewriteDescriptorList &);

class RewriteSymbolPass : public PassInfoMixin<RewriteSymbolPass> {
public:
  RewriteSymbolPass() { loadAndParseMapFiles(); }

RewriteSymbolPass(SymbolRewriter::RewriteDescriptorList &DL) {
    Descriptors.splice(Descriptors.begin(), DL);
  }

PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);

// Glue for old PM
  bool runImpl(Module &M);

private:
  void loadAndParseMapFiles();

SymbolRewriter::RewriteDescriptorList Descriptors;
};

} // end namespace llvm

#endif //LLVM_TRANSFORMS_UTILS_SYMBOLREWRITER_H

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