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dec9bd8187
These command line options are not intended for public use, and often don't even make sense in the context of a particular tool anyway. About 90% of them are already hidden, but when people add new options they forget to hide them, so if you were to make a brand new tool today, link against one of LLVM's libraries, and run tool -help you would get a bunch of junk that doesn't make sense for the tool you're writing. This patch hides these options. The real solution is to not have libraries defining command line options, but that's a much larger effort and not something I'm prepared to take on. Differential Revision: https://reviews.llvm.org/D40674 llvm-svn: 319505
92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
//===-- RandomNumberGenerator.cpp - Implement RNG class -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements deterministic random number generation (RNG).
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// The current implementation is NOT cryptographically secure as it uses
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// the C++11 <random> facilities.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/RandomNumberGenerator.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#ifdef LLVM_ON_WIN32
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#include "Windows/WindowsSupport.h"
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#else
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#include "Unix/Unix.h"
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#endif
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using namespace llvm;
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#define DEBUG_TYPE "rng"
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// Tracking BUG: 19665
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// http://llvm.org/bugs/show_bug.cgi?id=19665
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//
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// Do not change to cl::opt<uint64_t> since this silently breaks argument parsing.
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static cl::opt<unsigned long long>
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Seed("rng-seed", cl::value_desc("seed"), cl::Hidden,
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cl::desc("Seed for the random number generator"), cl::init(0));
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RandomNumberGenerator::RandomNumberGenerator(StringRef Salt) {
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DEBUG(
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if (Seed == 0)
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dbgs() << "Warning! Using unseeded random number generator.\n"
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);
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// Combine seed and salts using std::seed_seq.
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// Data: Seed-low, Seed-high, Salt
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// Note: std::seed_seq can only store 32-bit values, even though we
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// are using a 64-bit RNG. This isn't a problem since the Mersenne
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// twister constructor copies these correctly into its initial state.
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std::vector<uint32_t> Data;
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Data.resize(2 + Salt.size());
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Data[0] = Seed;
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Data[1] = Seed >> 32;
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std::copy(Salt.begin(), Salt.end(), Data.begin() + 2);
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std::seed_seq SeedSeq(Data.begin(), Data.end());
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Generator.seed(SeedSeq);
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}
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RandomNumberGenerator::result_type RandomNumberGenerator::operator()() {
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return Generator();
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}
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// Get random vector of specified size
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std::error_code llvm::getRandomBytes(void *Buffer, size_t Size) {
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#ifdef LLVM_ON_WIN32
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HCRYPTPROV hProvider;
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if (CryptAcquireContext(&hProvider, 0, 0, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
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ScopedCryptContext ScopedHandle(hProvider);
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if (CryptGenRandom(hProvider, Size, static_cast<BYTE *>(Buffer)))
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return std::error_code();
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}
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return std::error_code(GetLastError(), std::system_category());
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#else
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int Fd = open("/dev/urandom", O_RDONLY);
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if (Fd != -1) {
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std::error_code Ret;
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ssize_t BytesRead = read(Fd, Buffer, Size);
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if (BytesRead == -1)
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Ret = std::error_code(errno, std::system_category());
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else if (BytesRead != static_cast<ssize_t>(Size))
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Ret = std::error_code(EIO, std::system_category());
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if (close(Fd) == -1)
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Ret = std::error_code(errno, std::system_category());
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return Ret;
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}
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return std::error_code(errno, std::system_category());
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#endif
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}
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