Class Compiler

java.lang.Object

com.ibm.wala.shrike.shrikeBT.Compiler

All Implemented Interfaces:

Constants

Direct Known Subclasses:

CTCompiler

public abstract class Compiler
extends Object
implements Constants

This class generates Java bytecode from ShrikeBT Instructions.

If there are too many instructions to fit into 64K bytecodes, then we break the method up, generating auxiliary methods called by the main method.

This class is abstract; there are subclasses for specific class file access toolkits. These toolkits are responsible for providing ways to allocate constant pool entries.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	Compiler.Output	This class represents a method generated by a Compiler.

Field Summary

Fields inherited from interface Constants

ACC_ABSTRACT, ACC_ANNOTATION, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_MODULE, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_VOLATILE, CONSTANT_Class, CONSTANT_Double, CONSTANT_FieldRef, CONSTANT_Float, CONSTANT_Integer, CONSTANT_InterfaceMethodRef, CONSTANT_InvokeDynamic, CONSTANT_Long, CONSTANT_MethodHandle, CONSTANT_MethodRef, CONSTANT_MethodType, CONSTANT_NameAndType, CONSTANT_String, CONSTANT_Utf8, indexedTypes, indexedTypes_T, MAYBE, NO, OP_aaload, OP_aastore, OP_aconst_null, OP_aload, OP_aload_0, OP_aload_1, OP_aload_2, OP_aload_3, OP_anewarray, OP_areturn, OP_arraylength, OP_astore, OP_astore_0, OP_astore_1, OP_astore_2, OP_astore_3, OP_athrow, OP_baload, OP_bastore, OP_bipush, OP_caload, OP_castore, OP_checkcast, OP_d2f, OP_d2i, OP_d2l, OP_dadd, OP_daload, OP_dastore, OP_dcmpg, OP_dcmpl, OP_dconst_0, OP_dconst_1, OP_ddiv, OP_dload, OP_dload_0, OP_dload_1, OP_dload_2, OP_dload_3, OP_dmul, OP_dneg, OP_drem, OP_dreturn, OP_dstore, OP_dstore_0, OP_dstore_1, OP_dstore_2, OP_dstore_3, OP_dsub, OP_dup, OP_dup_x1, OP_dup_x2, OP_dup2, OP_dup2_x1, OP_dup2_x2, OP_f2d, OP_f2i, OP_f2l, OP_fadd, OP_faload, OP_fastore, OP_fcmpg, OP_fcmpl, OP_fconst_0, OP_fconst_1, OP_fconst_2, OP_fdiv, OP_fload, OP_fload_0, OP_fload_1, OP_fload_2, OP_fload_3, OP_fmul, OP_fneg, OP_frem, OP_freturn, OP_fstore, OP_fstore_0, OP_fstore_1, OP_fstore_2, OP_fstore_3, OP_fsub, OP_getfield, OP_getstatic, OP_goto, OP_goto_w, OP_i2b, OP_i2c, OP_i2d, OP_i2f, OP_i2l, OP_i2s, OP_iadd, OP_iaload, OP_iand, OP_iastore, OP_iconst_0, OP_iconst_1, OP_iconst_2, OP_iconst_3, OP_iconst_4, OP_iconst_5, OP_iconst_m1, OP_idiv, OP_if_acmpeq, OP_if_acmpne, OP_if_icmpeq, OP_if_icmpge, OP_if_icmpgt, OP_if_icmple, OP_if_icmplt, OP_if_icmpne, OP_ifeq, OP_ifge, OP_ifgt, OP_ifle, OP_iflt, OP_ifne, OP_ifnonnull, OP_ifnull, OP_iinc, OP_iload, OP_iload_0, OP_iload_1, OP_iload_2, OP_iload_3, OP_imul, OP_ineg, OP_instanceof, OP_invokedynamic, OP_invokeinterface, OP_invokespecial, OP_invokestatic, OP_invokevirtual, OP_ior, OP_irem, OP_ireturn, OP_ishl, OP_ishr, OP_istore, OP_istore_0, OP_istore_1, OP_istore_2, OP_istore_3, OP_isub, OP_iushr, OP_ixor, OP_jsr, OP_jsr_w, OP_l2d, OP_l2f, OP_l2i, OP_ladd, OP_laload, OP_land, OP_lastore, OP_lcmp, OP_lconst_0, OP_lconst_1, OP_ldc, OP_ldc_w, OP_ldc2_w, OP_ldiv, OP_lload, OP_lload_0, OP_lload_1, OP_lload_2, OP_lload_3, OP_lmul, OP_lneg, OP_lookupswitch, OP_lor, OP_lrem, OP_lreturn, OP_lshl, OP_lshr, OP_lstore, OP_lstore_0, OP_lstore_1, OP_lstore_2, OP_lstore_3, OP_lsub, OP_lushr, OP_lxor, OP_monitorenter, OP_monitorexit, OP_multianewarray, OP_new, OP_newarray, OP_nop, OP_pop, OP_pop2, OP_putfield, OP_putstatic, OP_ret, OP_return, OP_saload, OP_sastore, OP_sipush, OP_swap, OP_tableswitch, OP_wide, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TYPE_boolean, TYPE_boolean_index, TYPE_byte, TYPE_byte_index, TYPE_char, TYPE_char_index, TYPE_Class, TYPE_double, TYPE_double_index, TYPE_Error, TYPE_Exception, TYPE_float, TYPE_float_index, TYPE_int, TYPE_int_index, TYPE_long, TYPE_long_index, TYPE_MethodHandle, TYPE_MethodType, TYPE_null, TYPE_Object, TYPE_Object_index, TYPE_RuntimeException, TYPE_short, TYPE_short_index, TYPE_String, TYPE_Throwable, TYPE_unknown, TYPE_void, YES

Constructor Summary

Constructors

Modifier	Constructor	Description
	Compiler(boolean isConstructor, boolean isStatic, String classType, String signature, IInstruction[] instructions, ExceptionHandler[][] handlers, int[] instructionsToBytecodes)	Initialize a Compiler for the given method data.
protected	Compiler(MethodData info)	Extract the data for the method to be compiled from the MethodData container.

Method Summary

Modifier and Type	Method	Description
protected abstract int	allocateConstantPoolClassType(String c)
protected abstract int	allocateConstantPoolDouble(double v)
protected abstract int	allocateConstantPoolField(String c, String name, String type)
protected abstract int	allocateConstantPoolFloat(float v)
protected abstract int	allocateConstantPoolInteger(int v)
protected abstract int	allocateConstantPoolInterfaceMethod(String c, String name, String sig)
protected abstract int	allocateConstantPoolInvokeDynamic(BootstrapMethodsReader.BootstrapMethod b, String name, String type)
protected abstract int	allocateConstantPoolLong(long v)
protected abstract int	allocateConstantPoolMethod(String c, String name, String sig)
protected abstract int	allocateConstantPoolMethodHandle(ConstantPoolParser.ReferenceToken c)
protected abstract int	allocateConstantPoolMethodType(String c)
protected abstract int	allocateConstantPoolString(String v)
final void	compile()	Do the work of generating new bytecodes.
protected abstract String	createHelperMethod(boolean isStatic, String sig)
final Compiler.Output[]	getAuxiliaryMethods()	Get bytecodes and other information for any helper methods that are required to implement the main method.
final String	getClassType()
final Compiler.Output	getOutput()	Get the output bytecodes and other information for the method.
final void	setClassHierarchy(ClassHierarchyProvider h)
final void	setPresetConstants(ConstantPoolReader cp)	Notify the compiler that the constants appearing in the ConstantPoolReader cp will appear in the final class file.

Methods inherited from class Object

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

Constructor Details

Compiler

public Compiler(boolean isConstructor,
 boolean isStatic,
 String classType,
 String signature,
 IInstruction[] instructions,
 ExceptionHandler[][] handlers,
 int[] instructionsToBytecodes)

Initialize a Compiler for the given method data.

Parameters:

isStatic - true iff the method is static

classType - the JVM type of the class the method belongs to

signature - the JVM signature of the method

instructions - the ShrikeBT instructions

handlers - the ShrikeBT exception handlers

instructionsToBytecodes - the map from instructions to original bytecode offsets

Throws:

IllegalArgumentException - if handlers is null

IllegalArgumentException - if instructions is null

IllegalArgumentException - if instructionsToBytecodes is null

Compiler

protected Compiler(MethodData info)

Extract the data for the method to be compiled from the MethodData container.

Method Details

getClassType

public final String getClassType()

Returns:

the JVM type for the class this method belongs to

setPresetConstants

public final void setPresetConstants(ConstantPoolReader cp)

Notify the compiler that the constants appearing in the ConstantPoolReader cp will appear in the final class file.

Instructions which were extracted from a class file with the same ConstantPoolReader can be written back much more efficiently if the same constant pool indices are valid in the new class file.

setClassHierarchy

public final void setClassHierarchy(ClassHierarchyProvider h)

allocateConstantPoolInteger

protected abstract int allocateConstantPoolInteger(int v)

allocateConstantPoolFloat

protected abstract int allocateConstantPoolFloat(float v)

allocateConstantPoolLong

protected abstract int allocateConstantPoolLong(long v)

allocateConstantPoolDouble

protected abstract int allocateConstantPoolDouble(double v)

allocateConstantPoolString

protected abstract int allocateConstantPoolString(String v)

allocateConstantPoolClassType

protected abstract int allocateConstantPoolClassType(String c)

allocateConstantPoolMethodType

protected abstract int allocateConstantPoolMethodType(String c)

allocateConstantPoolMethodHandle

protected abstract int allocateConstantPoolMethodHandle(ConstantPoolParser.ReferenceToken c)

allocateConstantPoolField

protected abstract int allocateConstantPoolField(String c,
 String name,
 String type)

allocateConstantPoolMethod

protected abstract int allocateConstantPoolMethod(String c,
 String name,
 String sig)

allocateConstantPoolInterfaceMethod

protected abstract int allocateConstantPoolInterfaceMethod(String c,
 String name,
 String sig)

allocateConstantPoolInvokeDynamic

protected abstract int allocateConstantPoolInvokeDynamic(BootstrapMethodsReader.BootstrapMethod b,
 String name,
 String type)

createHelperMethod

protected abstract String createHelperMethod(boolean isStatic,
 String sig)

compile

public final void compile()

Do the work of generating new bytecodes.

In pathological cases this could throw an Error, when the code you passed in is too large to fit into a single JVM method and Compiler can't find a way to break it up into helper methods. You probably won't encounter this unless you try to make it happen :-).

getOutput

public final Compiler.Output getOutput()

Get the output bytecodes and other information for the method.

getAuxiliaryMethods

public final Compiler.Output[] getAuxiliaryMethods()

Get bytecodes and other information for any helper methods that are required to implement the main method. These helpers represent code that could not be fit into the main method because of JVM method size constraints.