Examples with Debugger org.mvel2.debug.Debugger used on opensource projects

Example 1 with Debugger

use of org.mvel2.debug.Debugger in project mvel by mvel.

the class MVELRuntime method execute.

/**
 * Main interpreter.
 *
 * @param debugger        Run in debug mode
 * @param expression      The compiled expression object
 * @param ctx             The root context object
 * @param variableFactory The variable factory to be injected
 * @return The resultant value
 * @see org.mvel2.MVEL
 */
public static Object execute(boolean debugger, final CompiledExpression expression, final Object ctx, VariableResolverFactory variableFactory) {
    Object v1, v2;
    ExecutionStack stk = new ExecutionStack();
    ASTNode tk = expression.getFirstNode();
    Integer operator;
    if (tk == null)
        return null;
    try {
        do {
            if (tk.fields == -1) {
                /**
                 * This may seem silly and redundant, however, when an MVEL script recurses into a block
                 * or substatement, a new runtime loop is entered.   Since the debugger state is not
                 * passed through the AST, it is not possible to forward the state directly.  So when we
                 * encounter a debugging symbol, we check the thread local to see if there is are registered
                 * breakpoints.  If we find them, we assume that we are debugging.
                 *
                 * The consequence of this of course, is that it's not ideal to compileShared expressions with
                 * debugging symbols which you plan to use in a production enviroment.
                 */
                if (debugger || (debugger = hasDebuggerContext())) {
                    try {
                        debuggerContext.get().checkBreak((LineLabel) tk, variableFactory, expression);
                    } catch (NullPointerException e) {
                    // do nothing for now.  this isn't as calus as it seems.
                    }
                }
                continue;
            } else if (stk.isEmpty()) {
                stk.push(tk.getReducedValueAccelerated(ctx, ctx, variableFactory));
            }
            if (variableFactory.tiltFlag()) {
                return stk.pop();
            }
            switch(operator = tk.getOperator()) {
                case RETURN:
                    variableFactory.setTiltFlag(true);
                    return stk.pop();
                case NOOP:
                    continue;
                case TERNARY:
                    if (!stk.popBoolean()) {
                        // noinspection StatementWithEmptyBody
                        while (tk.nextASTNode != null && !(tk = tk.nextASTNode).isOperator(TERNARY_ELSE)) ;
                    }
                    stk.clear();
                    continue;
                case TERNARY_ELSE:
                    return stk.pop();
                case END_OF_STMT:
                    /**
                     * If the program doesn't end here then we wipe anything off the stack that remains.
                     * Althought it may seem like intuitive stack optimizations could be leveraged by
                     * leaving hanging values on the stack,  trust me it's not a good idea.
                     */
                    if (tk.nextASTNode != null) {
                        stk.clear();
                    }
                    continue;
            }
            stk.push(tk.nextASTNode.getReducedValueAccelerated(ctx, ctx, variableFactory), operator);
            try {
                while (stk.isReduceable()) {
                    if ((Integer) stk.peek() == CHOR) {
                        stk.pop();
                        v1 = stk.pop();
                        v2 = stk.pop();
                        if (!isEmpty(v2) || !isEmpty(v1)) {
                            stk.clear();
                            stk.push(!isEmpty(v2) ? v2 : v1);
                        } else
                            stk.push(null);
                    } else {
                        stk.op();
                    }
                }
            } catch (ClassCastException e) {
                throw new CompileException("syntax error or incomptable types", new char[0], 0, e);
            } catch (CompileException e) {
                throw e;
            } catch (Exception e) {
                throw new CompileException("failed to compileShared sub expression", new char[0], 0, e);
            }
        } while ((tk = tk.nextASTNode) != null);
        return stk.peek();
    } catch (NullPointerException e) {
        if (tk != null && tk.isOperator() && tk.nextASTNode != null) {
            throw new CompileException("incomplete statement: " + tk.getName() + " (possible use of reserved keyword as identifier: " + tk.getName() + ")", tk.getExpr(), tk.getStart());
        } else {
            throw e;
        }
    } finally {
        OptimizerFactory.clearThreadAccessorOptimizer();
    }
}

Example 2 with Debugger

use of org.mvel2.debug.Debugger in project mvel by mvel.

the class DebuggerTests method testDebuggerInvoke.

public void testDebuggerInvoke() {
    count = 0;
    MVELRuntime.resetDebugger();
    MVELRuntime.setThreadDebugger(new Debugger() {

        public int onBreak(Frame frame) {
            if (frame.getFactory().isResolveable("a1")) {
                a1++;
            }
            if (frame.getFactory().isResolveable("a4")) {
                a4++;
                System.out.println("HEI " + frame.getLineNumber());
            }
            count++;
            return 0;
        }
    });
    String src = "a1=7;\na2=8;\na3=9;\na4=10;\na5=11;\na6=12;\na7=13;\na8=14;";
    ParserContext ctx = new ParserContext();
    ctx.setSourceFile("mysource");
    ctx.setDebugSymbols(true);
    ExpressionCompiler c = new ExpressionCompiler(src, ctx);
    CompiledExpression compexpr = c.compile();
    System.out.println(decompile(compexpr));
    MVELRuntime.registerBreakpoint(ctx.getSourceFile(), 1);
    MVELRuntime.registerBreakpoint(ctx.getSourceFile(), 3);
    MVELRuntime.registerBreakpoint(ctx.getSourceFile(), 7);
    VariableResolverFactory factory = new DefaultLocalVariableResolverFactory();
    MVEL.executeDebugger(compexpr, null, factory);
    System.out.println(a1);
    System.out.println(a4);
    System.out.println(count);
    assertEquals(2, a1);
    // test passes but the breakpoint should be received by line 7, not by line 3
    assertEquals(1, a4);
    // three breakpoints FAILS
    assertEquals(3, count);
}

Example 3 with Debugger

use of org.mvel2.debug.Debugger in project mvel by mvel.

the class DebuggerTests method testBreakpointsAcrossComments2.

public void testBreakpointsAcrossComments2() {
    ParserContext ctx = new ParserContext();
    ctx.setSourceFile("test2.mv");
    ctx.setDebugSymbols(true);
    ExpressionCompiler compiler = new ExpressionCompiler(// 1
    "// This is a comment\n" + // 2
    "//Second comment line\n" + // 3
    "//Third Comment Line\n" + // 4
    "\n" + // 5
    "//Test\n" + // 6
    "System.out.println('4');\n" + // 7
    "//System.out.println('5'); \n" + // 8
    "a = 0;\n" + // 9
    "b = 1;\n" + " a + b", // 10
    ctx);
    CompiledExpression compiled = compiler.compile();
    MVELRuntime.registerBreakpoint("test2.mv", 6);
    MVELRuntime.registerBreakpoint("test2.mv", 8);
    MVELRuntime.registerBreakpoint("test2.mv", 9);
    MVELRuntime.registerBreakpoint("test2.mv", 10);
    final Set<Integer> breaked = new HashSet<Integer>();
    Debugger testDebugger = new Debugger() {

        public int onBreak(Frame frame) {
            System.out.println("Breakpoint [source:" + frame.getSourceName() + "; line:" + frame.getLineNumber() + "]");
            breaked.add(frame.getLineNumber());
            return 0;
        }
    };
    MVELRuntime.setThreadDebugger(testDebugger);
    assertEquals(1, MVEL.executeDebugger(compiled, null, new MapVariableResolverFactory(createTestMap())));
    assertEquals("did not break at expected lines", Make.Set.<Integer>$()._(6)._(8)._(9)._(10)._(), breaked);
}

Example 4 with Debugger

use of org.mvel2.debug.Debugger in project mvel by mvel.

the class DebuggerTests method testDebuggerInvoke2.

public void testDebuggerInvoke2() {
    count = 0;
    MVELRuntime.resetDebugger();
    MVELRuntime.setThreadDebugger(new Debugger() {

        public int onBreak(Frame frame) {
            count++;
            return 0;
        }
    });
    String src = "a1=7;\na2=8;\nSystem.out.println(\"h\");\nac=23;\nde=23;\nge=23;\ngef=34;";
    ParserContext ctx = new ParserContext();
    ctx.setSourceFile("mysource");
    ctx.setDebugSymbols(true);
    ExpressionCompiler c = new ExpressionCompiler(src, ctx);
    CompiledExpression compexpr = c.compile();
    System.out.println(decompile(compexpr));
    MVELRuntime.registerBreakpoint(ctx.getSourceFile(), 1);
    MVELRuntime.registerBreakpoint(ctx.getSourceFile(), 2);
    MVELRuntime.registerBreakpoint(ctx.getSourceFile(), 3);
    MVELRuntime.registerBreakpoint(ctx.getSourceFile(), 4);
    MVELRuntime.registerBreakpoint(ctx.getSourceFile(), 5);
    VariableResolverFactory factory = new DefaultLocalVariableResolverFactory();
    MVEL.executeDebugger(compexpr, null, factory);
    System.out.println(count);
    assertEquals(5, count);
}

Example 5 with Debugger

use of org.mvel2.debug.Debugger in project mvel by mvel.

the class DebuggerTests method testBreakpointsAcrossComments.

public void testBreakpointsAcrossComments() {
    String expression = // 1
    "/** This is a comment\n" + // 2
    " *  Second comment line\n" + // 3
    " *  Third Comment Line\n" + // 4
    " */\n" + // 5
    "System.out.println('4');\n" + // 6
    "System.out.println('5');\n" + // 7
    "a = 0;\n" + // 8
    "b = 1;\n" + // 9
    "a + b";
    ParserContext ctx = new ParserContext();
    ctx.setSourceFile("test2.mv");
    ctx.setDebugSymbols(true);
    ExpressionCompiler compiler = new ExpressionCompiler(expression, ctx);
    System.out.println("Expression:\n------------");
    System.out.println(expression);
    System.out.println("------------");
    CompiledExpression compiled = compiler.compile();
    MVELRuntime.registerBreakpoint("test2.mv", 9);
    final Set<Integer> linesEncountered = new HashSet<Integer>();
    Debugger testDebugger = new Debugger() {

        public int onBreak(Frame frame) {
            linesEncountered.add(frame.getLineNumber());
            System.out.println("Breakpoint Encountered [source:" + frame.getSourceName() + "; line:" + frame.getLineNumber() + "]");
            System.out.println("vars:" + frame.getFactory().getKnownVariables());
            System.out.println("Resume Execution");
            return 0;
        }
    };
    MVELRuntime.setThreadDebugger(testDebugger);
    assertEquals(1, MVEL.executeDebugger(compiled, null, new MapVariableResolverFactory(createTestMap())));
    assertTrue("Debugger did not break at line 9", linesEncountered.contains(9));
}