LLVMPhiManager.java

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package com.oracle.truffle.llvm.parser;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.oracle.truffle.llvm.parser.model.ModelModule;
import com.oracle.truffle.llvm.parser.model.blocks.InstructionBlock;
import com.oracle.truffle.llvm.parser.model.functions.FunctionDeclaration;
import com.oracle.truffle.llvm.parser.model.functions.FunctionDefinition;
import com.oracle.truffle.llvm.parser.model.globals.GlobalAlias;
import com.oracle.truffle.llvm.parser.model.globals.GlobalConstant;
import com.oracle.truffle.llvm.parser.model.globals.GlobalVariable;
import com.oracle.truffle.llvm.parser.model.symbols.instructions.PhiInstruction;
import com.oracle.truffle.llvm.parser.model.visitors.FunctionVisitor;
import com.oracle.truffle.llvm.parser.model.visitors.InstructionVisitorAdapter;
import com.oracle.truffle.llvm.parser.model.visitors.ModelVisitor;
import com.oracle.truffle.llvm.runtime.types.Type;
import com.oracle.truffle.llvm.runtime.types.symbols.Symbol;
import com.oracle.truffle.llvm.runtime.types.symbols.ValueSymbol;

public final class LLVMPhiManager implements ModelVisitor {

    static LLVMPhiManager generate(ModelModule model) {
        LLVMPhiManager visitor = new LLVMPhiManager();

        model.accept(visitor);

        return visitor;
    }

    private final Map<String, Map<InstructionBlock, List<Phi>>> edges = new HashMap<>();

    private LLVMPhiManager() {
    }

    public Map<InstructionBlock, List<Phi>> getPhiMap(String method) {
        Map<InstructionBlock, List<Phi>> references = edges.get(method);
        if (references == null) {
            return Collections.emptyMap();
        } else {
            return references;
        }
    }

    @Override
    public void visit(GlobalAlias alias) {
    }

    @Override
    public void visit(GlobalConstant constant) {
    }

    @Override
    public void visit(GlobalVariable variable) {
    }

    @Override
    public void visit(FunctionDeclaration method) {
    }

    @Override
    public void visit(FunctionDefinition method) {
        LLVMPhiManagerFunctionVisitor visitor = new LLVMPhiManagerFunctionVisitor();

        method.accept(visitor);

        edges.put(method.getName(), visitor.getEdges());
    }

    @Override
    public void visit(Type type) {
    }

    private static class LLVMPhiManagerFunctionVisitor implements FunctionVisitor, InstructionVisitorAdapter {

        private final Map<InstructionBlock, List<Phi>> edges = new HashMap<>();

        private InstructionBlock currentBlock = null;

        LLVMPhiManagerFunctionVisitor() {
        }

        public Map<InstructionBlock, List<Phi>> getEdges() {
            return edges;
        }

        @Override
        public void visit(InstructionBlock block) {
            this.currentBlock = block;
            block.accept(this);
        }

        @Override
        public void visit(PhiInstruction phi) {
            for (int i = 0; i < phi.getSize(); i++) {
                InstructionBlock blk = phi.getBlock(i);
                List<Phi> references = edges.computeIfAbsent(blk, k -> new ArrayList<>());
                references.add(new Phi(currentBlock, phi, phi.getValue(i)));
            }
        }
    }

    static final class Phi {

        private final InstructionBlock block;

        private final ValueSymbol phi;

        private final Symbol value;

        private Phi(InstructionBlock block, ValueSymbol phi, Symbol value) {
            this.block = block;
            this.phi = phi;
            this.value = value;
        }

        public InstructionBlock getBlock() {
            return block;
        }

        public ValueSymbol getPhiValue() {
            return phi;
        }

        public Symbol getValue() {
            return value;
        }
    }
}