class FunctionType;
class GVMaterializer;
class LLVMContext;
-class RandomNumberGenerator;
class StructType;
template<typename T> struct DenseMapInfo;
template<typename KeyT, typename ValueT, typename KeyInfoT> class DenseMap;
std::string ModuleID; ///< Human readable identifier for the module
std::string TargetTriple; ///< Platform target triple Module compiled on
void *NamedMDSymTab; ///< NamedMDNode names.
- // Allow lazy initialization in const method.
- mutable RandomNumberGenerator *RNG; ///< The random number generator for this module.
// We need to keep the string because the C API expects us to own the string
// representation.
/// @returns a string containing the module-scope inline assembly blocks.
const std::string &getModuleInlineAsm() const { return GlobalScopeAsm; }
- /// Get the RandomNumberGenerator for this module. The RNG can be
- /// seeded via -rng-seed=<uint64> and is salted with the ModuleID.
- /// The returned RNG should not be shared across threads.
- RandomNumberGenerator &getRNG() const;
-
/// @}
/// @name Module Level Mutators
/// @{
+++ /dev/null
-//==- llvm/Support/RandomNumberGenerator.h - RNG for diversity ---*- C++ -*-==//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines an abstraction for random number generation (RNG).
-// Note that the current implementation is not cryptographically secure
-// as it uses the C++11 <random> facilities.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_SUPPORT_RANDOMNUMBERGENERATOR_H_
-#define LLVM_SUPPORT_RANDOMNUMBERGENERATOR_H_
-
-#include "llvm/ADT/StringRef.h"
-#include <random>
-
-namespace llvm {
-
-/// A random number generator.
-/// Instances of this class should not be shared across threads.
-class RandomNumberGenerator {
-public:
- /// Seeds and salts the underlying RNG engine. The salt of type StringRef
- /// is passed into the constructor. The seed can be set on the command
- /// line via -rng-seed=<uint64>.
- /// The reason for the salt is to ensure different random streams even if
- /// the same seed is used for multiple invocations of the compiler.
- /// A good salt value should add additional entropy and be constant across
- /// different machines (i.e., no paths) to allow for reproducible builds.
- /// An instance of this class can be retrieved from the current Module.
- /// \see Module::getRNG
- RandomNumberGenerator(StringRef Salt);
-
- /// Returns a random number in the range [0, Max).
- uint64_t next(uint64_t Max);
-
-private:
- // 64-bit Mersenne Twister by Matsumoto and Nishimura, 2000
- // http://en.cppreference.com/w/cpp/numeric/random/mersenne_twister_engine
- std::mt19937_64 Generator;
-
- // Noncopyable.
- RandomNumberGenerator(const RandomNumberGenerator &other) = delete;
- RandomNumberGenerator &operator=(const RandomNumberGenerator &other) = delete;
-};
-}
-
-#endif
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/LeakDetector.h"
#include "llvm/Support/Dwarf.h"
-#include "llvm/Support/Path.h"
-#include "llvm/Support/RandomNumberGenerator.h"
#include <algorithm>
#include <cstdarg>
#include <cstdlib>
//
Module::Module(StringRef MID, LLVMContext &C)
- : Context(C), Materializer(), ModuleID(MID), RNG(nullptr), DL("") {
+ : Context(C), Materializer(), ModuleID(MID), DL("") {
ValSymTab = new ValueSymbolTable();
NamedMDSymTab = new StringMap<NamedMDNode *>();
Context.addModule(this);
NamedMDList.clear();
delete ValSymTab;
delete static_cast<StringMap<NamedMDNode *> *>(NamedMDSymTab);
- delete RNG;
}
/// getNamedValue - Return the first global value in the module with
return &DL;
}
-// We want reproducible builds, but ModuleID may be a full path so we just use
-// the filename to salt the RNG (although it is not guaranteed to be unique).
-RandomNumberGenerator &Module::getRNG() const {
- if (RNG == nullptr) {
- StringRef Salt = sys::path::filename(ModuleID);
- RNG = new RandomNumberGenerator(Salt);
- }
- return *RNG;
-}
-
//===----------------------------------------------------------------------===//
// Methods to control the materialization of GlobalValues in the Module.
//
MD5.cpp
PluginLoader.cpp
PrettyStackTrace.cpp
- RandomNumberGenerator.cpp
Regex.cpp
SmallPtrSet.cpp
SmallVector.cpp
+++ /dev/null
-//===-- RandomNumberGenerator.cpp - Implement RNG class -------------------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements random number generation (RNG).
-// The current implementation is NOT cryptographically secure as it uses
-// the C++11 <random> facilities.
-//
-//===----------------------------------------------------------------------===//
-
-#define DEBUG_TYPE "rng"
-#include "llvm/Support/RandomNumberGenerator.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Debug.h"
-
-using namespace llvm;
-
-// Tracking BUG: 19665
-// http://llvm.org/bugs/show_bug.cgi?id=19665
-//
-// Do not change to cl::opt<uint64_t> since this silently breaks argument parsing.
-static cl::opt<unsigned long long>
-Seed("rng-seed", cl::value_desc("seed"),
- cl::desc("Seed for the random number generator"), cl::init(0));
-
-RandomNumberGenerator::RandomNumberGenerator(StringRef Salt) {
- DEBUG(
- if (Seed == 0)
- errs() << "Warning! Using unseeded random number generator.\n"
- );
-
- // Combine seed and salt using std::seed_seq.
- // Entropy: Seed-low, Seed-high, Salt...
- size_t Size = Salt.size() + 2;
- uint32_t Data[Size];
- Data[0] = Seed;
- Data[1] = Seed >> 32;
- std::copy_n(Salt.begin(), Salt.size(), Data + 2);
-
- std::seed_seq SeedSeq(Data, Data + Size);
- Generator.seed(SeedSeq);
-}
-
-uint64_t RandomNumberGenerator::next(uint64_t Max) {
- std::uniform_int_distribution<uint64_t> distribution(0, Max - 1);
- return distribution(Generator);
-}
projects / oota-llvm.git / commitdiff