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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
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 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
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 * This license is subject to the following condition:
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package com.oracle.truffle.sl.nodes.instrument;

import static com.oracle.truffle.api.instrument.StandardSyntaxTag.ASSIGNMENT;
import static com.oracle.truffle.api.instrument.StandardSyntaxTag.START_LOOP;
import static com.oracle.truffle.api.instrument.StandardSyntaxTag.STATEMENT;

import com.oracle.truffle.api.instrument.ASTProber;
import com.oracle.truffle.api.instrument.InstrumentationNode;
import com.oracle.truffle.api.instrument.Instrumenter;
import com.oracle.truffle.api.instrument.Probe;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.NodeVisitor;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.sl.nodes.SLExpressionNode;
import com.oracle.truffle.sl.nodes.SLStatementNode;
import com.oracle.truffle.sl.nodes.controlflow.SLBlockNode;
import com.oracle.truffle.sl.nodes.controlflow.SLFunctionBodyNode;
import com.oracle.truffle.sl.nodes.controlflow.SLWhileNode;
import com.oracle.truffle.sl.nodes.local.SLReadArgumentNode;
import com.oracle.truffle.sl.nodes.local.SLWriteLocalVariableNode;

/**
 * A visitor which traverses a completely parsed Simple AST (presumed not yet executed) and enables
 * {@linkplain Instrumenter Instrumentation} at a few standard kinds of nodes.
 */
public class SLStandardASTProber implements ASTProber {

    public void probeAST(final Instrumenter instrumenter, RootNode startNode) {
        startNode.accept(new NodeVisitor() {

            public boolean visit(Node node) {

                if (!(node instanceof InstrumentationNode) && node instanceof SLStatementNode && node.getParent() != null && node.getSourceSection() != null) {

                    // Skip nodes that don't really correspond to statements
                    if (node instanceof SLFunctionBodyNode || node instanceof SLBlockNode || node instanceof SLReadArgumentNode) {
                        return true;
                    }

                    // Skip synthetic statements at beginning of function body that assign locals
                    if (node instanceof SLWriteLocalVariableNode) {
                        final Node child = node.getChildren().iterator().next();
                        if (child instanceof SLReadArgumentNode) {
                            return true;
                        }
                    }
                    if (node instanceof SLExpressionNode) {
                        SLExpressionNode expressionNode = (SLExpressionNode) node;
                        final Probe probe = instrumenter.probe(expressionNode);
                        if (node instanceof SLWriteLocalVariableNode) {
                            probe.tagAs(STATEMENT, null);
                            probe.tagAs(ASSIGNMENT, null);
                        }
                    } else {
                        if (!(node.getParent() instanceof SLFunctionBodyNode)) {
                            SLStatementNode statementNode = (SLStatementNode) node;
                            final Probe probe = instrumenter.probe(statementNode);
                            probe.tagAs(STATEMENT, null);
                            if (node instanceof SLWhileNode) {
                                probe.tagAs(START_LOOP, null);
                            }
                        }
                    }
                }
                return true;
            }
        });
    }
}