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// Class for barrier instructions, modelled as a CallInstr.
//
// Copyright (c) 2011 Universidad Rey Juan Carlos
// Copyright (c) 2013-2014, Texas Instruments Incorporated - http://www.ti.com/
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include <cstdio>
#include "config.h"
#if (defined LLVM_3_1 or defined LLVM_3_2)
#include "llvm/Instructions.h"
#include "llvm/Function.h"
#include "llvm/Module.h"
#else
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#endif
#include "llvm/Support/Casting.h"
#define BARRIER_FUNCTION_NAME "barrier"
namespace pocl {
class Barrier : public llvm::CallInst {
public:
static void GetBarriers(llvm::SmallVectorImpl<Barrier *> &B,
llvm::Module &M) {
llvm::Function *F = M.getFunction(BARRIER_FUNCTION_NAME);
if (F != NULL) {
for (llvm::Function::use_iterator i = F->use_begin(), e = F->use_end();
i != e; ++i)
B.push_back(llvm::cast<Barrier>(*i));
}
}
/**
* Creates a new barrier before the given instruction.
*
* If there was already a barrier there, returns the old one.
*/
static Barrier *Create(llvm::Instruction *InsertBefore) {
llvm::Module *M = InsertBefore->getParent()->getParent()->getParent();
if (InsertBefore != &InsertBefore->getParent()->front() &&
llvm::isa<Barrier>(InsertBefore->getPrevNode()))
return llvm::cast<Barrier>(InsertBefore->getPrevNode());
llvm::Type *Int32Type = llvm::Type::getInt32Ty(M->getContext());
llvm::Function *F = llvm::cast<llvm::Function>
(M->getOrInsertFunction(BARRIER_FUNCTION_NAME,
llvm::Type::getVoidTy(M->getContext()),
Int32Type,
NULL));
llvm::SmallVector<llvm::Value *, 4> argsarray;
argsarray.push_back(llvm::ConstantInt::get(Int32Type, 0));
llvm::ArrayRef<llvm::Value *> args(argsarray);
return llvm::cast<pocl::Barrier>
(llvm::CallInst::Create(F, args, "", InsertBefore));
}
static bool classof(const Barrier *) { return true; };
static bool classof(const llvm::CallInst *C) {
return C->getCalledFunction() != NULL &&
C->getCalledFunction()->getName() == BARRIER_FUNCTION_NAME;
}
static bool classof(const Instruction *I) {
return (llvm::isa<llvm::CallInst>(I) &&
classof(llvm::cast<llvm::CallInst>(I)));
}
static bool classof(const User *U) {
return (llvm::isa<Instruction>(U) &&
classof(llvm::cast<llvm::Instruction>(U)));
}
static bool hasOnlyBarrier(const llvm::BasicBlock *bb)
{
return endsWithBarrier(bb) && bb->size() == 2;
}
static bool hasBarrier(const llvm::BasicBlock *bb)
{
for (llvm::BasicBlock::const_iterator i = bb->begin(), e = bb->end();
i != e; ++i)
{
if (llvm::isa<Barrier>(i)) return true;
}
return false;
}
// returns true in case the given basic block ends with a barrier,
// that is, contains only a branch instruction after a barrier call
static bool endsWithBarrier(const llvm::BasicBlock *bb)
{
const llvm::TerminatorInst *t = bb->getTerminator();
if (t == NULL) return false;
return bb->size() > 1 && t->getPrevNode() != NULL &&
llvm::isa<Barrier>(t->getPrevNode());
}
};
}
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