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Random Number Generator (llvm)

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Summary:
Provides an abstraction for a random number generator (RNG) that produces a stream of pseudo-random numbers.
The current implementation uses C++11 facilities and is therefore not cryptographically secure.

The RNG is salted with the text of the current command line invocation.
In addition, a user may specify a seed (reproducible builds).

In clang, the seed can be set via
  -frandom-seed=X
In the back end, the seed can be set via
  -rng-seed=X

This is the llvm part of the patch.
clang part: D3391

Reviewers: ahomescu, rinon, nicholas, jfb

Reviewed By: jfb

Subscribers: jfb, perl

Differential Revision: http://reviews.llvm.org/D3390

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211145 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
JF Bastien
2014-06-18 06:23:25 +00:00
parent 74287ec34c
commit 1d04a2324c
5 changed files with 128 additions and 1 deletions
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8
include/llvm/IR/Module.h
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@ -29,6 +29,7 @@ namespace llvm {
class FunctionType;
class GVMaterializer;
class LLVMContext;
class RandomNumberGenerator;
class StructType;
template<typename T> struct DenseMapInfo;
template<typename KeyT, typename ValueT, typename KeyInfoT> class DenseMap;
@ -201,6 +202,8 @@ private:
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.
@ -249,6 +252,11 @@ public:
/// @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
/// @{