org.apache.drill.exec.compile.bytecode

Class MethodAnalyzer<V extends org.objectweb.asm.tree.analysis.Value>

java.lang.Object

org.objectweb.asm.tree.analysis.Analyzer<V>

org.apache.drill.exec.compile.bytecode.MethodAnalyzer<V>

All Implemented Interfaces:

org.objectweb.asm.Opcodes

public class MethodAnalyzer<V extends org.objectweb.asm.tree.analysis.Value>
extends org.objectweb.asm.tree.analysis.Analyzer<V>

Analyzer that allows us to inject additional functionality into ASMs basic analysis.

We need to be able to keep track of local variables that are assigned to each other so that we can infer their replacability (for scalar replacement). In order to do that, we need to know when local variables are assigned (with the old value being overwritten) so that we can associate them with the new value, and hence determine whether they can also be replaced, or not.

In order to capture the assignment operation, we have to provide our own Frame<>, but ASM doesn't provide a direct way to do that. Here, we use the Analyzer's newFrame() methods as factories that will provide our own derivative of Frame<> which we use to detect

Field Summary

Fields inherited from interface org.objectweb.asm.Opcodes

AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_MANDATED, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_VARARGS, ACC_VOLATILE, ACONST_NULL, ALOAD, ANEWARRAY, ARETURN, ARRAYLENGTH, ASM4, ASM5, ASTORE, ATHROW, BALOAD, BASTORE, BIPUSH, CALOAD, CASTORE, CHECKCAST, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DLOAD, DMUL, DNEG, DOUBLE, DREM, DRETURN, DSTORE, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F_APPEND, F_CHOP, F_FULL, F_NEW, F_SAME, F_SAME1, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, FLOAT, FMUL, FNEG, FREM, FRETURN, FSTORE, FSUB, GETFIELD, GETSTATIC, GOTO, H_GETFIELD, H_GETSTATIC, H_INVOKEINTERFACE, H_INVOKESPECIAL, H_INVOKESTATIC, H_INVOKEVIRTUAL, H_NEWINVOKESPECIAL, H_PUTFIELD, H_PUTSTATIC, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, IF_ACMPEQ, IF_ACMPNE, IF_ICMPEQ, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ICMPLT, IF_ICMPNE, IFEQ, IFGE, IFGT, IFLE, IFLT, IFNE, IFNONNULL, IFNULL, IINC, ILOAD, IMUL, INEG, INSTANCEOF, INTEGER, INVOKEDYNAMIC, INVOKEINTERFACE, INVOKESPECIAL, INVOKESTATIC, INVOKEVIRTUAL, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE, ISUB, IUSHR, IXOR, JSR, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDC, LDIV, LLOAD, LMUL, LNEG, LONG, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSUB, LUSHR, LXOR, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, NEW, NEWARRAY, NOP, NULL, POP, POP2, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SWAP, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8

Constructor Summary

Constructors

Constructor and Description
MethodAnalyzer(org.objectweb.asm.tree.analysis.Interpreter<V> interpreter) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
protected org.objectweb.asm.tree.analysis.Frame<V>	newFrame(org.objectweb.asm.tree.analysis.Frame<? extends V> src)
protected org.objectweb.asm.tree.analysis.Frame<V>	newFrame(int maxLocals, int maxStack)

Methods inherited from class org.objectweb.asm.tree.analysis.Analyzer

analyze, getFrames, getHandlers, init, newControlFlowEdge, newControlFlowExceptionEdge, newControlFlowExceptionEdge

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MethodAnalyzer

public MethodAnalyzer(org.objectweb.asm.tree.analysis.Interpreter<V> interpreter)

Constructor.

Parameters:

interpreter - the interpreter to use

Method Detail

newFrame

protected org.objectweb.asm.tree.analysis.Frame<V> newFrame(int maxLocals,
                                                int maxStack)

Overrides:

newFrame in class org.objectweb.asm.tree.analysis.Analyzer<V extends org.objectweb.asm.tree.analysis.Value>

newFrame

protected org.objectweb.asm.tree.analysis.Frame<V> newFrame(org.objectweb.asm.tree.analysis.Frame<? extends V> src)

Overrides:

newFrame in class org.objectweb.asm.tree.analysis.Analyzer<V extends org.objectweb.asm.tree.analysis.Value>