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277 lines
9.8 KiB
C++
277 lines
9.8 KiB
C++
//===-- DAGBuilder.cpp - Turn an LLVM BasicBlock into a DAG for selection -===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file turns an LLVM BasicBlock into a target independent SelectionDAG in
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// preparation for target specific optimizations and instruction selection.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/Constants.h"
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#include "llvm/Function.h"
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#include "llvm/Instructions.h"
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#include "llvm/Type.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/InstVisitor.h"
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namespace llvm {
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struct SelectionDAGBuilder : public InstVisitor<SelectionDAGBuilder> {
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// DAG - the current dag we are building.
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SelectionDAG &DAG;
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// SDTB - The target-specific builder interface, which indicates how to expand
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// extremely target-specific aspects of the representation, such as function
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// calls and arguments.
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SelectionDAGTargetBuilder &SDTB;
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// BB - The current machine basic block we are working on.
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MachineBasicBlock *BB;
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// CurRoot - The root built for the current basic block.
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SelectionDAGNode *CurRoot;
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SelectionDAGBuilder(SelectionDAG &dag, SelectionDAGTargetBuilder &sdtb)
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: DAG(dag), SDTB(sdtb), BB(0), CurRoot(0) {}
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void visitBB(BasicBlock &bb);
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// Visitation methods for instructions: Create the appropriate DAG nodes for
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// the instruction.
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void visitAdd(BinaryOperator &BO);
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void visitSub(BinaryOperator &BO);
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void visitMul(BinaryOperator &BO);
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void visitAnd(BinaryOperator &BO);
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void visitOr (BinaryOperator &BO);
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void visitXor(BinaryOperator &BO);
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void visitSetEQ(BinaryOperator &BO);
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void visitLoad(LoadInst &LI);
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void visitCall(CallInst &CI);
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void visitBr(BranchInst &BI);
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void visitRet(ReturnInst &RI);
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void visitInstruction(Instruction &I) {
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std::cerr << "DAGBuilder: Cannot instruction select: " << I;
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abort();
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}
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private:
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SelectionDAGNode *getNodeFor(Value *V);
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SelectionDAGNode *getNodeFor(Value &V) { return getNodeFor(&V); }
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SelectionDAGNode *addSeqNode(SelectionDAGNode *N);
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};
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/// addSeqNode - The same as addNode, but the node is also included in the
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/// sequence nodes for this block. This method should be called for any
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/// instructions which have a specified sequence they must be evaluated in.
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///
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SelectionDAGNode *SelectionDAGBuilder::addSeqNode(SelectionDAGNode *N) {
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DAG.addNode(N); // First, add the node to the selection DAG
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if (!CurRoot)
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CurRoot = N;
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else {
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// Create and add a new chain node for the existing root and this node...
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CurRoot = DAG.addNode(new SelectionDAGNode(ISD::ChainNode, MVT::isVoid,
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BB, CurRoot, N));
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}
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return N;
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}
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/// getNodeFor - This method returns the SelectionDAGNode for the specified LLVM
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/// value, creating a node as necessary.
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///
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SelectionDAGNode *SelectionDAGBuilder::getNodeFor(Value *V) {
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// If we already have the entry, return it.
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SelectionDAGNode*& Entry = DAG.ValueMap[V];
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if (Entry) return Entry;
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// Otherwise, we need to create a node to return now... start by figuring out
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// which type the node will be...
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MVT::ValueType ValueType = DAG.getValueType(V->getType());
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if (Instruction *I = dyn_cast<Instruction>(V))
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// Instructions will be filled in later. For now, just create and return a
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// dummy node.
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return Entry = new SelectionDAGNode(ISD::ProtoNode, ValueType);
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if (Constant *C = dyn_cast<Constant>(V)) {
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if (ConstantBool *CB = dyn_cast<ConstantBool>(C)) {
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Entry = new SelectionDAGNode(ISD::Constant, ValueType);
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Entry->addValue(new ReducedValue_Constant_i1(CB->getValue()));
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} else if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
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Entry = new SelectionDAGNode(ISD::Constant, ValueType);
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switch (ValueType) {
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case MVT::i8:
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Entry->addValue(new ReducedValue_Constant_i8(CI->getRawValue()));
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break;
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case MVT::i16:
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Entry->addValue(new ReducedValue_Constant_i16(CI->getRawValue()));
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break;
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case MVT::i32:
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Entry->addValue(new ReducedValue_Constant_i32(CI->getRawValue()));
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break;
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case MVT::i64:
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Entry->addValue(new ReducedValue_Constant_i64(CI->getRawValue()));
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break;
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default:
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assert(0 && "Invalid ValueType for an integer constant!");
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}
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} else if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
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Entry = new SelectionDAGNode(ISD::Constant, ValueType);
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if (ValueType == MVT::f32)
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Entry->addValue(new ReducedValue_Constant_f32(CFP->getValue()));
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else
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Entry->addValue(new ReducedValue_Constant_f64(CFP->getValue()));
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}
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if (Entry) return Entry;
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} else if (BasicBlock *BB = dyn_cast<BasicBlock>(V)) {
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Entry = new SelectionDAGNode(ISD::BasicBlock, ValueType);
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Entry->addValue(new ReducedValue_BasicBlock_i32(DAG.BlockMap[BB]));
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return Entry;
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}
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std::cerr << "Unhandled LLVM value in DAG Builder!: " << *V << "\n";
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abort();
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return 0;
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}
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// visitBB - This method is used to visit a basic block in the program. It
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// manages the CurRoot instance variable so that all of the visit(Instruction)
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// methods can be written to assume that there is only one basic block being
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// constructed.
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//
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void SelectionDAGBuilder::visitBB(BasicBlock &bb) {
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BB = DAG.BlockMap[&bb]; // Update BB instance var
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// Save the current global DAG...
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SelectionDAGNode *OldRoot = CurRoot;
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CurRoot = 0;
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visit(bb.begin(), bb.end()); // Visit all of the instructions...
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if (OldRoot) {
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if (!CurRoot)
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CurRoot = OldRoot; // This block had no root of its own..
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else {
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// The previous basic block AND this basic block had roots, insert a
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// block chain node now...
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CurRoot = DAG.addNode(new SelectionDAGNode(ISD::BlockChainNode,
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MVT::isVoid,
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BB, OldRoot, CurRoot));
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}
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}
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}
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//===----------------------------------------------------------------------===//
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// ...Visitation Methods...
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//===----------------------------------------------------------------------===//
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void SelectionDAGBuilder::visitAdd(BinaryOperator &BO) {
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getNodeFor(BO)->setNode(ISD::Plus, BB, getNodeFor(BO.getOperand(0)),
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getNodeFor(BO.getOperand(1)));
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}
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void SelectionDAGBuilder::visitSub(BinaryOperator &BO) {
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getNodeFor(BO)->setNode(ISD::Minus, BB, getNodeFor(BO.getOperand(0)),
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getNodeFor(BO.getOperand(1)));
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}
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void SelectionDAGBuilder::visitMul(BinaryOperator &BO) {
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getNodeFor(BO)->setNode(ISD::Times, BB, getNodeFor(BO.getOperand(0)),
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getNodeFor(BO.getOperand(1)));
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}
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void SelectionDAGBuilder::visitAnd(BinaryOperator &BO) {
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getNodeFor(BO)->setNode(ISD::And, BB, getNodeFor(BO.getOperand(0)),
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getNodeFor(BO.getOperand(1)));
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}
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void SelectionDAGBuilder::visitOr(BinaryOperator &BO) {
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getNodeFor(BO)->setNode(ISD::Or, BB, getNodeFor(BO.getOperand(0)),
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getNodeFor(BO.getOperand(1)));
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}
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void SelectionDAGBuilder::visitXor(BinaryOperator &BO) {
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getNodeFor(BO)->setNode(ISD::Xor, BB, getNodeFor(BO.getOperand(0)),
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getNodeFor(BO.getOperand(1)));
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}
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void SelectionDAGBuilder::visitSetEQ(BinaryOperator &BO) {
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getNodeFor(BO)->setNode(ISD::SetEQ, BB, getNodeFor(BO.getOperand(0)),
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getNodeFor(BO.getOperand(1)));
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}
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void SelectionDAGBuilder::visitRet(ReturnInst &RI) {
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if (RI.getNumOperands()) { // Value return
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addSeqNode(new SelectionDAGNode(ISD::Ret, MVT::isVoid, BB,
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getNodeFor(RI.getOperand(0))));
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} else { // Void return
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addSeqNode(new SelectionDAGNode(ISD::RetVoid, MVT::isVoid, BB));
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}
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}
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void SelectionDAGBuilder::visitBr(BranchInst &BI) {
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if (BI.isUnconditional())
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addSeqNode(new SelectionDAGNode(ISD::Br, MVT::isVoid, BB,
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getNodeFor(BI.getOperand(0))));
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else
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addSeqNode(new SelectionDAGNode(ISD::BrCond, MVT::isVoid, BB,
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getNodeFor(BI.getCondition()),
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getNodeFor(BI.getSuccessor(0)),
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getNodeFor(BI.getSuccessor(1))));
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}
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void SelectionDAGBuilder::visitLoad(LoadInst &LI) {
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// FIXME: this won't prevent reordering of loads!
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getNodeFor(LI)->setNode(ISD::Load, BB, getNodeFor(LI.getOperand(0)));
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}
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void SelectionDAGBuilder::visitCall(CallInst &CI) {
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SDTB.expandCall(DAG, CI);
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}
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// SelectionDAG constructor - Just use the SelectionDAGBuilder to do all of the
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// dirty work...
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SelectionDAG::SelectionDAG(MachineFunction &f, const TargetMachine &tm,
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SelectionDAGTargetBuilder &SDTB)
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: F(f), TM(tm) {
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switch (TM.getTargetData().getPointerSize()) {
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default: assert(0 && "Unknown pointer size!"); abort();
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case 8: PointerType = MVT::i8; break;
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case 16: PointerType = MVT::i16; break;
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case 32: PointerType = MVT::i32; break;
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case 64: PointerType = MVT::i64; break;
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}
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// Create all of the machine basic blocks for the function... building the
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// BlockMap. This map is used for PHI node conversion.
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const Function &Fn = *F.getFunction();
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for (Function::const_iterator I = Fn.begin(), E = Fn.end(); I != E; ++I)
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F.getBasicBlockList().push_back(BlockMap[I] = new MachineBasicBlock(I));
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SDTB.expandArguments(*this);
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SelectionDAGBuilder SDB(*this, SDTB);
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for (Function::const_iterator I = Fn.begin(), E = Fn.end(); I != E; ++I)
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SDB.visitBB(const_cast<BasicBlock&>(*I));
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Root = SDB.CurRoot;
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}
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} // End llvm namespace
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