Lab 6: Code Generation

CSE 431S (Spring 2008)

Lab 6: Code Generation

Lab	Assigned		Lab Due (Start of class)
	9	Apr	23	Apr

Abstract: You will generate code for simple expressions.

Because of some of the difficulties this semester with eclipse, I have reworked and repackaged much of the course software.
A consequence of the reorganization is that you must delete and reinstall some of the jar files. To be safe:
- Delete the following files from the usual place (or anywhere you think they may be found):
  - parser.jar file. I have repackaged the course-sponsored parser so it's out the way of your parser, so there cannot be any confusion between loading the two. The course-sponsored parser is now distributed along with the other course software in the same jar file.
  - classsolutions.jar file. I never liked the name, and the word "class" is misleading. There is a different file, below, that has all of the course software.
- Install the following files jar files in the usual place:
  - coursesolutions has all of the course software
  - MakeSymString (new and improved)
  - JFlex (unchanged)
  - Jasmin (unchanged)
  - CUP (unchanged)
Download the zip file and install it as a new project in eclipse.
- In the top-level build.xml file, be sure to change YourToolPath to the path where the jar files are installed.
- Click on the CSE431hw6 project and from File→Properties, add coursesolutions.jar and java-cup-11a.jar to the Java Build Path
Execute the default ant target, causing it to run in the same JRE as eclipse and causing the workspace to be refreshed after the task finishes.
The project should build and run on the two test files, performing the following sequence of passes as called from Main.java:
1. The AST is built using the course-sponsored parser, but you are welcome to use your own. You will have to edit Main.java to use your parser and scanner instead of mine.
2. The symbol table is built as in Lab 4 using the course-sponsored solution. You are welcome to yours instead. You will have to modify the visitor returned from SymtabVisitor.java
3. A pass is made to establish the type of all operations and to insert conversion where appropriate. This is a simplified version of what you wrote for Studio 10.
4. The code-generating visitor is run. As shipped, the visitor is the course-sponsored solution. You must modify CodeGenVisitor.java so that its getCodeGenVsitor() returns your visitor instead of mine.

JavaDoc for the assignment is shipped with you in the zip file and is also available here

Here is what you have to do for this assignment. The code you develop will be part of your final project:

Look at the API for my solution to this problem. The API shows the visit(...) methods I wrote to solve this assignment.
Look at the various emit methods in the CodeGenVisitor file. Those methods produce Jasmin output for your pass.
By interception of MethodDeclaring, emit code to define methods properly -- including static, public, etc. For this assignment, do not worry about the parameters (the examples have none), but you must emit the return type of the method, wihch can be obtained from MethodDeclaring's getType() method and then calling getTypeString() on that.
By interception of AssignIsh, generate code for assignment statements by evaluating the right-hand side (recursive visit), and then storing the result in register 1 (ignoring, for now, the left-hand side). After storing the result, print the following out:
```
  Register 1 has ....
```
where the .... are replaced by the integer value in register 1. Code for doing that sort of thing can be modeled after what you wrote for Studios 8 and 9.
By interception of other types of nodes, generate code for the constant and arithmetic nodes.

The skeleton code provided in CodeGenVisitor automatically calls the method main431(), so you don't have to handle the invoke instruction yet.

Be certain to modify and submit only the file CodeGenVisitor.java.

Your solution must work correctly on the provided test files.
To turn in your work, attach CodeGenVisitor.java as an email attachment sent to legrand@cs.wustl.edu.

CSE 431S (Spring 2008) Lab 6: Code Generation

CSE 431S (Spring 2008)

CSE 431S (Spring 2008)

Lab 6: Code Generation