//
//===----------------------------------------------------------------------===//
//
-// This pass replaces occurences of __nvvm_reflect("string") with an
+// This pass replaces occurrences of __nvvm_reflect("string") with an
// integer based on -nvvm-reflect-list string=<int> option given to this pass.
// If an undefined string value is seen in a call to __nvvm_reflect("string"),
// a default value of 0 will be used.
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
-#include "llvm/Pass.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Intrinsics.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/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_os_ostream.h"
+#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Scalar.h"
#include <map>
#include <sstream>
using namespace llvm;
+#define DEBUG_TYPE "nvptx-reflect"
+
namespace llvm { void initializeNVVMReflectPass(PassRegistry &); }
namespace {
private:
StringMap<int> VarMap;
typedef DenseMap<std::string, int>::iterator VarMapIter;
- Function *ReflectFunction;
public:
static char ID;
- NVVMReflect() : ModulePass(ID), ReflectFunction(0) {
+ NVVMReflect() : ModulePass(ID) {
initializeNVVMReflectPass(*PassRegistry::getPassRegistry());
VarMap.clear();
}
NVVMReflect(const StringMap<int> &Mapping)
- : ModulePass(ID), ReflectFunction(0) {
+ : ModulePass(ID) {
initializeNVVMReflectPass(*PassRegistry::getPassRegistry());
for (StringMap<int>::const_iterator I = Mapping.begin(), E = Mapping.end();
I != E; ++I) {
}
}
- void getAnalysisUsage(AnalysisUsage &AU) const { AU.setPreservesAll(); }
- virtual bool runOnModule(Module &);
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
+ AU.setPreservesAll();
+ }
+ bool runOnModule(Module &) override;
+private:
+ bool handleFunction(Function *ReflectFunction);
void setVarMap();
};
}
char NVVMReflect::ID = 0;
INITIALIZE_PASS(NVVMReflect, "nvvm-reflect",
- "Replace occurences of __nvvm_reflect() calls with 0/1", false,
+ "Replace occurrences of __nvvm_reflect() calls with 0/1", false,
false)
static cl::list<std::string>
}
}
-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;
-
+bool NVVMReflect::handleFunction(Function *ReflectFunction) {
// Validate _reflect function
assert(ReflectFunction->isDeclaration() &&
"_reflect function should not have a body");
// 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 I = ReflectFunction->use_begin(),
- E = ReflectFunction->use_end();
- I != E; ++I) {
- assert(isa<CallInst>(*I) && "Only a call instruction can use _reflect");
- CallInst *Reflect = cast<CallInst>(*I);
+
+ // IR for __nvvm_reflect calls differs between CUDA versions:
+ // CUDA 6.5 and earlier uses this sequence:
+ // %ptr = tail call i8* @llvm.nvvm.ptr.constant.to.gen.p0i8.p4i8
+ // (i8 addrspace(4)* getelementptr inbounds
+ // ([8 x i8], [8 x i8] addrspace(4)* @str, i32 0, i32 0))
+ // %reflect = tail call i32 @__nvvm_reflect(i8* %ptr)
+ //
+ // Value returned by Sym->getOperand(0) is a Constant with a
+ // ConstantDataSequential operand which can be converted to string and used
+ // for lookup.
+ //
+ // CUDA 7.0 does it slightly differently:
+ // %reflect = call i32 @__nvvm_reflect(i8* addrspacecast
+ // (i8 addrspace(1)* getelementptr inbounds
+ // ([8 x i8], [8 x i8] addrspace(1)* @str, i32 0, i32 0) to i8*))
+ //
+ // In this case, we get a Constant with a GlobalVariable operand and we need
+ // to dig deeper to find its initializer with the string we'll use for lookup.
+
+ for (User *U : ReflectFunction->users()) {
+ assert(isa<CallInst>(U) && "Only a call instruction can use _reflect");
+ CallInst *Reflect = cast<CallInst>(U);
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) &&
+ const Value *Str = Reflect->getArgOperand(0);
+ if (isa<CallInst>(Str)) {
+ // CUDA path
+ const CallInst *ConvCall = cast<CallInst>(Str);
+ Str = ConvCall->getArgOperand(0);
+ }
+ assert(isa<ConstantExpr>(Str) &&
"Format of _reflect function not recognized");
- const ConstantExpr *GEP = cast<ConstantExpr>(str);
+ 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);
+ const Value *Operand = cast<Constant>(Sym)->getOperand(0);
+ if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(Operand)) {
+ // For CUDA-7.0 style __nvvm_reflect calls we need to find operand's
+ // initializer.
+ assert(GV->hasInitializer() &&
+ "Format of _reflect function not recognized");
+ const Constant *Initializer = GV->getInitializer();
+ Operand = Initializer;
+ }
- assert(isa<ConstantDataSequential>(SymStr->getOperand(0)) &&
+ assert(isa<ConstantDataSequential>(Operand) &&
"Format of _reflect function not recognized");
-
- assert(cast<ConstantDataSequential>(SymStr->getOperand(0))->isCString() &&
+ assert(cast<ConstantDataSequential>(Operand)->isCString() &&
"Format of _reflect function not recognized");
std::string ReflectArg =
- cast<ConstantDataSequential>(SymStr->getOperand(0))->getAsString();
+ cast<ConstantDataSequential>(Operand)->getAsString();
ReflectArg = ReflectArg.substr(0, ReflectArg.size() - 1);
DEBUG(dbgs() << "Arg of _reflect : " << ReflectArg << "\n");
ToRemove[i]->eraseFromParent();
return true;
}
+
+bool NVVMReflect::runOnModule(Module &M) {
+ if (!NVVMReflectEnabled)
+ return false;
+
+ setVarMap();
+
+
+ bool Res = false;
+ std::string Name;
+ Type *Tys[1];
+ Type *I8Ty = Type::getInt8Ty(M.getContext());
+ Function *ReflectFunction;
+
+ // Check for standard overloaded versions of llvm.nvvm.reflect
+
+ for (unsigned i = 0; i != 5; ++i) {
+ Tys[0] = PointerType::get(I8Ty, i);
+ Name = Intrinsic::getName(Intrinsic::nvvm_reflect, Tys);
+ ReflectFunction = M.getFunction(Name);
+ if(ReflectFunction != 0) {
+ Res |= handleFunction(ReflectFunction);
+ }
+ }
+
+ ReflectFunction = M.getFunction(NVVM_REFLECT_FUNCTION);
+ // If reflect function is not used, then there will be
+ // no entry in the module.
+ if (ReflectFunction != 0)
+ Res |= handleFunction(ReflectFunction);
+
+ return Res;
+}
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