Chapter 10: Intermediate Representations
programs from their source form into
a representation that is suitable for interpretation or execution.
The chapters of this book have thus far considered the scanning, parsing,
and semantic analysis of programs written in
source languages such as Java and C++.
The Abstract Syntax Tree (AST) was introduced in
to represent the source program
in a form that omits unnecessary syntactic detail. Semantic
information was developed in
to prepare the
AST for code generation. The next and final step of a simple compiler
is code generation. Code generation for a virtual machine is
Chapter 12 and
support and code-generation techniques for low-level targets.
Preparation for generating code for a given architecture should include
gaining some familiarity with the architecture.
Such studies may include reading a specification of the
code that will be generated, examining code sequences from other compilers,
and writing some sample sequences by hand.
In this chapter,
we examine a form of code known as an Intermediate Representation.
The studio for this chapter helps the student gain familiarity with the
Java Virtual Machine instruction set.