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//===- NVVMReflect.cpp - NVVM Emulate conditional compilation -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This pass replaces occurences of __nvvm_reflect("string") with an
// integer based on -nvvm-reflect-list string=<int> option given to this pass.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/StringMap.h"
#include "llvm/Pass.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Constants.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_os_ostream.h"
#include "llvm/Transforms/Scalar.h"
#include <map>
#include <sstream>
#include <string>
#include <vector>
#define NVVM_REFLECT_FUNCTION "__nvvm_reflect"
using namespace llvm;
namespace llvm { void initializeNVVMReflectPass(PassRegistry &); }
namespace {
class LLVM_LIBRARY_VISIBILITY NVVMReflect : public ModulePass {
private:
//std::map<std::string, int> VarMap;
StringMap<int> VarMap;
typedef std::map<std::string, int>::iterator VarMapIter;
Function *reflectFunction;
public:
static char ID;
NVVMReflect() : ModulePass(ID) {
VarMap.clear();
reflectFunction = 0;
}
void getAnalysisUsage(AnalysisUsage &AU) const { AU.setPreservesAll(); }
virtual bool runOnModule(Module &);
void setVarMap();
};
}
static cl::opt<bool>
NVVMReflectEnabled("nvvm-reflect-enable", cl::init(true),
cl::desc("NVVM reflection, enabled by default"));
char NVVMReflect::ID = 0;
INITIALIZE_PASS(NVVMReflect, "nvvm-reflect",
"Replace occurences of __nvvm_reflect() calls with 0/1", false,
false)
static cl::list<std::string>
ReflectList("nvvm-reflect-list", cl::value_desc("name=0/1"),
cl::desc("A list of string=num assignments, where num=0 or 1"),
cl::ValueRequired);
/// This function does the same operation as perl's split.
/// For example, calling this with ("a=1,b=2,c=0", ",") will
/// return ["a=1", "b=2", "c=0"] in the return std::vector.
static std::vector<std::string>
Tokenize(const std::string &str, const std::string &delim) {
std::vector<std::string> tokens;
size_t p0 = 0, p1 = std::string::npos;
while (p0 != std::string::npos) {
p1 = str.find_first_of(delim, p0);
if (p1 != p0) {
std::string token = str.substr(p0, p1 - p0);
tokens.push_back(token);
}
p0 = str.find_first_not_of(delim, p1);
}
return tokens;
}
/// The command line can look as follows :
/// -R a=1,b=2 -R c=3,d=0 -R e=2
/// The strings "a=1,b=2", "c=3,d=0", "e=2" are available in the
/// ReflectList vector. First, each of ReflectList[i] is 'split'
/// using "," as the delimiter. Then each of this part is split
/// using "=" as the delimiter.
void NVVMReflect::setVarMap() {
for (unsigned i = 0, e = ReflectList.size(); i != e; ++i) {
// DEBUG(dbgs() << "Option : " << ReflectList[i] << std::endl);
std::vector<std::string> nameValList = Tokenize(ReflectList[i], ",");
for (unsigned j = 0, ej = nameValList.size(); j != ej; ++j) {
std::vector<std::string> nameValPair = Tokenize(nameValList[j], "=");
assert(nameValPair.size() == 2 && "name=val expected");
std::stringstream valstream(nameValPair[1]);
int val;
valstream >> val;
assert((!(valstream.fail())) && "integer value expected");
VarMap[nameValPair[0]] = val;
}
}
}
bool NVVMReflect::runOnModule(Module &M) {
if (!NVVMReflectEnabled)
return false;
setVarMap();
reflectFunction = M.getFunction(NVVM_REFLECT_FUNCTION);
// If reflect function is not used, then there will be
// no entry in the module.
if (reflectFunction == 0) {
return false;
}
// Validate _reflect function
assert(reflectFunction->isDeclaration() &&
"_reflect function should not have a body");
assert(reflectFunction->getReturnType()->isIntegerTy() &&
"_reflect's return type should be integer");
std::vector<Instruction *> toRemove;
// Go through the uses of reflectFunction in this Function.
// Each of them should a CallInst with a ConstantArray argument.
// First validate that. If the c-string corresponding to the
// ConstantArray can be found successfully, see if it can be
// found in VarMap. If so, replace the uses of CallInst with the
// value found in VarMap. If not, replace the use with value 0.
for (Value::use_iterator iter = reflectFunction->use_begin(),
iterEnd = reflectFunction->use_end();
iter != iterEnd; ++iter) {
assert(isa<CallInst>(*iter) && "Only a call instruction can use _reflect");
CallInst *reflect = cast<CallInst>(*iter);
assert((reflect->getNumOperands() == 2) &&
"Only one operand expect for _reflect function");
// In cuda, we will have an extra constant-to-generic conversion of
// the string.
const Value *conv = reflect->getArgOperand(0);
assert(isa<CallInst>(conv) && "Expected a const-to-gen conversion");
const CallInst *convcall = cast<CallInst>(conv);
const Value *str = convcall->getArgOperand(0);
assert(isa<ConstantExpr>(str) &&
"Format of _reflect function not recognized");
const ConstantExpr *gep = cast<ConstantExpr>(str);
const Value *sym = gep->getOperand(0);
assert(isa<Constant>(sym) && "Format of _reflect function not recognized");
const Constant *symstr = cast<Constant>(sym);
assert(isa<ConstantDataSequential>(symstr->getOperand(0)) &&
"Format of _reflect function not recognized");
assert(cast<ConstantDataSequential>(symstr->getOperand(0))->isCString() &&
"Format of _reflect function not recognized");
std::string reflectArg =
cast<ConstantDataSequential>(symstr->getOperand(0))->getAsString();
reflectArg = reflectArg.substr(0, reflectArg.size() - 1);
// DEBUG(dbgs() << "Arg of _reflect : " << reflectArg << std::endl);
int reflectVal = 0; // The default value is 0
if (VarMap.find(reflectArg) != VarMap.end()) {
reflectVal = VarMap[reflectArg];
}
reflect->replaceAllUsesWith(
ConstantInt::get(reflect->getType(), reflectVal));
toRemove.push_back(reflect);
}
if (toRemove.size() == 0)
return false;
for (unsigned i = 0, e = toRemove.size(); i != e; ++i)
toRemove[i]->eraseFromParent();
return true;
}
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