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This requires a number of steps. 1) Move value_use_iterator into the Value class as an implementation detail 2) Change it to actually be a *Use* iterator rather than a *User* iterator. 3) Add an adaptor which is a User iterator that always looks through the Use to the User. 4) Wrap these in Value::use_iterator and Value::user_iterator typedefs. 5) Add the range adaptors as Value::uses() and Value::users(). 6) Update *all* of the callers to correctly distinguish between whether they wanted a use_iterator (and to explicitly dig out the User when needed), or a user_iterator which makes the Use itself totally opaque. Because #6 requires churning essentially everything that walked the Use-Def chains, I went ahead and added all of the range adaptors and switched them to range-based loops where appropriate. Also because the renaming requires at least churning every line of code, it didn't make any sense to split these up into multiple commits -- all of which would touch all of the same lies of code. The result is still not quite optimal. The Value::use_iterator is a nice regular iterator, but Value::user_iterator is an iterator over User*s rather than over the User objects themselves. As a consequence, it fits a bit awkwardly into the range-based world and it has the weird extra-dereferencing 'operator->' that so many of our iterators have. I think this could be fixed by providing something which transforms a range of T&s into a range of T*s, but that *can* be separated into another patch, and it isn't yet 100% clear whether this is the right move. However, this change gets us most of the benefit and cleans up a substantial amount of code around Use and User. =] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203364 91177308-0d34-0410-b5e6-96231b3b80d8
194 lines
6.6 KiB
C++
194 lines
6.6 KiB
C++
//===- NVVMReflect.cpp - NVVM Emulate conditional compilation -------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass replaces occurrences of __nvvm_reflect("string") with an
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// integer based on -nvvm-reflect-list string=<int> option given to this pass.
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// If an undefined string value is seen in a call to __nvvm_reflect("string"),
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// a default value of 0 will be used.
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//
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//===----------------------------------------------------------------------===//
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#include "NVPTX.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_os_ostream.h"
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#include "llvm/Transforms/Scalar.h"
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#include <map>
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#include <sstream>
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#include <string>
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#include <vector>
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#define NVVM_REFLECT_FUNCTION "__nvvm_reflect"
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using namespace llvm;
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namespace llvm { void initializeNVVMReflectPass(PassRegistry &); }
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namespace {
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class NVVMReflect : public ModulePass {
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private:
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StringMap<int> VarMap;
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typedef DenseMap<std::string, int>::iterator VarMapIter;
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Function *ReflectFunction;
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public:
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static char ID;
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NVVMReflect() : ModulePass(ID), ReflectFunction(0) {
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initializeNVVMReflectPass(*PassRegistry::getPassRegistry());
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VarMap.clear();
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}
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NVVMReflect(const StringMap<int> &Mapping)
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: ModulePass(ID), ReflectFunction(0) {
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initializeNVVMReflectPass(*PassRegistry::getPassRegistry());
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for (StringMap<int>::const_iterator I = Mapping.begin(), E = Mapping.end();
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I != E; ++I) {
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VarMap[(*I).getKey()] = (*I).getValue();
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}
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}
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void getAnalysisUsage(AnalysisUsage &AU) const { AU.setPreservesAll(); }
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virtual bool runOnModule(Module &);
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void setVarMap();
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};
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}
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ModulePass *llvm::createNVVMReflectPass() {
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return new NVVMReflect();
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}
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ModulePass *llvm::createNVVMReflectPass(const StringMap<int>& Mapping) {
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return new NVVMReflect(Mapping);
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}
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static cl::opt<bool>
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NVVMReflectEnabled("nvvm-reflect-enable", cl::init(true), cl::Hidden,
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cl::desc("NVVM reflection, enabled by default"));
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char NVVMReflect::ID = 0;
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INITIALIZE_PASS(NVVMReflect, "nvvm-reflect",
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"Replace occurrences of __nvvm_reflect() calls with 0/1", false,
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false)
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static cl::list<std::string>
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ReflectList("nvvm-reflect-list", cl::value_desc("name=<int>"), cl::Hidden,
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cl::desc("A list of string=num assignments"),
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cl::ValueRequired);
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/// The command line can look as follows :
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/// -nvvm-reflect-list a=1,b=2 -nvvm-reflect-list c=3,d=0 -R e=2
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/// The strings "a=1,b=2", "c=3,d=0", "e=2" are available in the
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/// ReflectList vector. First, each of ReflectList[i] is 'split'
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/// using "," as the delimiter. Then each of this part is split
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/// using "=" as the delimiter.
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void NVVMReflect::setVarMap() {
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for (unsigned i = 0, e = ReflectList.size(); i != e; ++i) {
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DEBUG(dbgs() << "Option : " << ReflectList[i] << "\n");
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SmallVector<StringRef, 4> NameValList;
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StringRef(ReflectList[i]).split(NameValList, ",");
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for (unsigned j = 0, ej = NameValList.size(); j != ej; ++j) {
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SmallVector<StringRef, 2> NameValPair;
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NameValList[j].split(NameValPair, "=");
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assert(NameValPair.size() == 2 && "name=val expected");
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std::stringstream ValStream(NameValPair[1]);
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int Val;
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ValStream >> Val;
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assert((!(ValStream.fail())) && "integer value expected");
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VarMap[NameValPair[0]] = Val;
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}
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}
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}
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bool NVVMReflect::runOnModule(Module &M) {
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if (!NVVMReflectEnabled)
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return false;
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setVarMap();
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ReflectFunction = M.getFunction(NVVM_REFLECT_FUNCTION);
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// If reflect function is not used, then there will be
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// no entry in the module.
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if (ReflectFunction == 0)
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return false;
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// Validate _reflect function
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assert(ReflectFunction->isDeclaration() &&
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"_reflect function should not have a body");
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assert(ReflectFunction->getReturnType()->isIntegerTy() &&
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"_reflect's return type should be integer");
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std::vector<Instruction *> ToRemove;
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// Go through the uses of ReflectFunction in this Function.
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// Each of them should a CallInst with a ConstantArray argument.
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// First validate that. If the c-string corresponding to the
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// ConstantArray can be found successfully, see if it can be
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// found in VarMap. If so, replace the uses of CallInst with the
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// value found in VarMap. If not, replace the use with value 0.
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for (User *U : ReflectFunction->users()) {
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assert(isa<CallInst>(U) && "Only a call instruction can use _reflect");
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CallInst *Reflect = cast<CallInst>(U);
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assert((Reflect->getNumOperands() == 2) &&
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"Only one operand expect for _reflect function");
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// In cuda, we will have an extra constant-to-generic conversion of
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// the string.
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const Value *conv = Reflect->getArgOperand(0);
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assert(isa<CallInst>(conv) && "Expected a const-to-gen conversion");
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const CallInst *ConvCall = cast<CallInst>(conv);
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const Value *str = ConvCall->getArgOperand(0);
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assert(isa<ConstantExpr>(str) &&
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"Format of _reflect function not recognized");
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const ConstantExpr *GEP = cast<ConstantExpr>(str);
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const Value *Sym = GEP->getOperand(0);
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assert(isa<Constant>(Sym) && "Format of _reflect function not recognized");
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const Constant *SymStr = cast<Constant>(Sym);
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assert(isa<ConstantDataSequential>(SymStr->getOperand(0)) &&
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"Format of _reflect function not recognized");
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assert(cast<ConstantDataSequential>(SymStr->getOperand(0))->isCString() &&
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"Format of _reflect function not recognized");
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std::string ReflectArg =
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cast<ConstantDataSequential>(SymStr->getOperand(0))->getAsString();
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ReflectArg = ReflectArg.substr(0, ReflectArg.size() - 1);
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DEBUG(dbgs() << "Arg of _reflect : " << ReflectArg << "\n");
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int ReflectVal = 0; // The default value is 0
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if (VarMap.find(ReflectArg) != VarMap.end()) {
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ReflectVal = VarMap[ReflectArg];
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}
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Reflect->replaceAllUsesWith(
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ConstantInt::get(Reflect->getType(), ReflectVal));
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ToRemove.push_back(Reflect);
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}
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if (ToRemove.size() == 0)
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return false;
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for (unsigned i = 0, e = ToRemove.size(); i != e; ++i)
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ToRemove[i]->eraseFromParent();
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return true;
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}
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