#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>
// 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.
+
+ // 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);
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");