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<head><title>P523 Project Five</title></head><body><h1>P523 Project Five</h1><h3>Fall Semester 96-97</h3><h3>Code Generation</h3><h3>Due 11:59pm Sunday, December 8</h3>Design and implement a code generator for programs in <!WA0><ahref="http://www.cs.indiana.edu/classes/p523/p4/proj4.html#weasel">weasel form</a>, using the procedure callingconventions and pointer and object representations discussed in class.Your code generator must produce assembly code for the <!WA1><ahref="http://www.cs.indiana.edu/classes/p523/p5/alpha.ps.gz">Alpha AXP</a> processor. Use the interpreterspresented in <!WA2><a href="http://www.cs.indiana.edu/classes/p523/p5/beta.ss">beta.ss</a> and <!WA3><ahref="http://www.cs.indiana.edu/classes/p523/p5/gamma.ss">gamma.ss</a> as guidelines for writing your codegenerator.<p><h3>Support Code</h3><!WA4><a href="http://www.cs.indiana.edu/classes/p523/p5/cg-help.ss"<tt>cg-help.ss</tt></a> provides some code generationutilities:<ul><li>symbolic constants for tagging<li><tt>open-file</tt> opens the assembly output file, <tt>scheme.s</tt>, and writesthe header<li><tt>emit</tt> writes assembly instructions to <tt>scheme.s</tt><li><tt>new-label</tt> creates a new assembly language label<li><tt>write-label</tt> writes a label to <tt>scheme.s</tt><li><tt>c-imm</tt> converts Scheme immediates to tagged Alpha immediates<li><tt>close-file</tt> writes trailer to <tt>scheme.s</tt> and closes it<li><tt>run-file</tt> copies <tt>scheme.s</tt> to your 431 directory on copper andexecutes a remote shell on copper to assemble and run it.</ul><p>The directory <tt>/u/c431/p5</tt> on copper contains support files for makingan executable file from your assembly output file, <tt>scheme.s</tt>:<ul><li><tt>startup.c</tt>: allocates and initializes the Scheme stack and heap,calls your code via the assembly stub <tt>call_scheme.s</tt>, and prints theresult.<li><tt>call_scheme.s</tt>: assembly language stub that sets up the Schemeregisters, places the return address onto the base of the frame, callsyour code, and returns to the C caller, <tt>startup.c</tt>.<li><tt>cg.h</tt>: assembly language header file that defines constants fortagging and generating immediates.</ul><p>You should create the directory <tt>copper:431</tt> and copy all thefiles from <tt>copper:/u/c431/p5</tt> into it. The procedures in<tt>cg-help.ss</tt> assume that this directory and your <tt>.rhosts</tt> fileon copper are set up.<p><tt>p5trial.alpha</tt> in <tt>/u/c431/p5</tt> on copper (and<tt>p5trial.sun4</tt> for Suns) defines the procedure <tt>c431-cg</tt>.<tt>(c431-cg <weasel>)</tt> generates Alpha assembly for the weaselprogram into the file <tt>scheme.s</tt> in the current directory.<p><tt>p5good</tt> (in <tt>/u/c431/p5</tt> on copper) gives a set of testcases you may find useful. Each test case is followed by the expectedresult in a comment. The result is printed in the same format<tt>startup.c</tt> prints it, so you can compare the results quiteeasily. <!WA5><a href="http://www.cs.indiana.edu/classes/p523/p5/p5test.ss">p5test.ss</a> provides a Scheme procedurethat will run your code generator on all the test cases in<tt>p5good</tt> and create the file tests.out that can be comparedagainst <tt>p5good</tt> using <tt>diff</tt>. <em>Before using this, you musthave the latest version of <tt>Makefile</tt> and <tt>startup.c</tt> from<tt>/u/c431/p5</tt>.</em><h3>Project report:</h3>Your project report should contain a description of your codegenerator along with the source for the code generator. It shouldalso contain sample assembly output for several small examples showingwhat the code generator produces for a variety of expressions. Followthe guidelines for documentation, neatness, and collaboration from thefirst project assignment.<p><h3>Late policy:</h3>Project reports may be handed in up to one week late without penalty.Reports handed in more than one week late will not be graded.</body>⌨️ 快捷键说明
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