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## Package com.saxonica.bytecode.util

This package contains utility classes supporting the generation of bytecode and the interface with the ASM library.

See:
Description

Interface Summary
MessageBuilder | Helper interface MeassageBuilder.

Class Summary
AnnotatedTraceClassVisitor | Subclass of TraceClassVisitor to enable the bytecode listings to be customized
AnnotatedTraceMethodVisitor | Subclass of the TraceMethodVisitor to customize the bytecode listings
Audit | Development aid to check that all Expression classes are compilable
ByteCodeTrace | Calls to this class are inserted into the bytecode for debugging purposes
Callback | A convenient place to put static methods that will be called from generated byte code
CompilerClassMapper | For each class of expression found on the expression tree, deliver a corresponding instance of the helper class used to generate Java code for the expression
CompilerService | Controlling/service class for compilation of expressions to Java bytecode
CompilerService.GeneratedClassInfo |
CompilerService.StaticSubClasses |
CompilerService.StaticVariableInfo |
GeneratedMethodInfo | Information about the current method whose bytecode is being generated
GeneratedMethodInfo.LocalSlotInfo |
Generator | This class is an extension of the ASM-supplied GeneratorAdapter library, containing additional utility and shortcut methods for bytecode generation
LabelInfo | An ASM label object with some control information to enable better diagnostics
LoopBodyGenerator | LoopBodyGenerator is code to generate the body of a loop, for example of a ForExpression.
MessageFromStack | Helper class to generate a run-time exception using a message that is present at the top of the bytecode stack
MessageTemplate | Helper class to build messages with a predefined prefix string, then runtime text, followed by predefined suffix string
NamedLabel | Subclass of the ASM Label class that adds a diagnostic name to the label; this enables more intelligible bytecode to be output for diagnostics
OnEmpty | The OnEmpty class represents an action to be taken by the bytecode generator when compiling an expression to return a "primitive" (unboxed) value such as a double float int long or String (treated as primitive for this purpose).
OnEmpty.ReturnEmptyString | The ReturnNull subclass indicates that when an expression evaluates to the empty sequence, the value should be returned as a zero-length string.
OnEmpty.ReturnNull | The ReturnNull subclass indicates that when an expression evaluates to the empty sequence, the value should be returned as a Java null.
OnEmpty.UnwindAndJump | The UnwindAndJump subclass causes the code generator, when an expression evaluates to the empty sequence, to generate a "goto" instruction to a defined label; but before executing the jump, the stack will be unwound to a known position.

Exception Summary
CannotCompileException | Exception indicating that constructs were encountered in the expression tree that cannot be compiled to bytecode

## Package com.saxonica.bytecode.util Description

This package contains utility classes supporting the generation of bytecode and the interface with the ASM library.

Michael H. Kay
Saxonica Limited
28 November 2011

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Copyright (c) 2004-2011 Saxonica Limited. All rights reserved.