[hcoop/debian/mlton.git] / doc / guide / localhost / GoogleSummerOfCode2014

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<a href="./Home">MLton 20180207</a>\r
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<h1>Google Summer of Code (2014)</h1>\r
<div id="toc">
  <div id="toctitle">Table of Contents</div>
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</div>\r
</div>\r
<div id="content">\r
<div class="sect1">\r
<h2 id="_mentors">Mentors</h2>\r
<div class="sectionbody">\r
<div class="paragraph"><p>The following developers have agreed to serve as mentors for the 2014 Google Summer of Code:</p></div>\r
<div class="ulist"><ul>\r
<li>\r
<p>\r
<a href="http://www.cs.rit.edu/%7Emtf">Matthew Fluet</a>\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://www.cse.buffalo.edu/%7Elziarek/">Lukasz (Luke) Ziarek</a>\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://people.cs.uchicago.edu/~jhr/">John Reppy</a>\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://www.cs.purdue.edu/homes/chandras">KC Sivaramakrishnan</a>\r
</p>\r
</li>\r
</ul></div>\r
</div>\r
</div>\r
<div class="sect1">\r
<h2 id="_ideas_list">Ideas List</h2>\r
<div class="sectionbody">\r
<div class="sect2">\r
<h3 id="_implement_a_partial_redundancy_elimination_pre_optimization">Implement a Partial Redundancy Elimination (PRE) Optimization</h3>\r
<div class="paragraph"><p>Partial redundancy elimination (PRE) is a program transformation that\r
removes operations that are redundant on some, but not necessarily all\r
paths, through the program.  PRE can subsume both common subexpression\r
elimination and loop-invariant code motion, and is therefore a\r
potentially powerful optimization.  However, a na&iuml;ve\r
implementation of PRE on a program in static single assignment (SSA)\r
form is unlikely to be effective.  This project aims to adapt and\r
implement the SSAPRE algorithm(s) of Thomas VanDrunen in MLton&#8217;s SSA\r
intermediate language.</p></div>\r
<div class="paragraph"><p>Background:</p></div>\r
<div class="openblock">\r
<div class="content">\r
<div class="ulist"><ul>\r
<li>\r
<p>\r
<a href="http://onlinelibrary.wiley.com/doi/10.1002/spe.618/abstract">Anticipation-based partial redundancy elimination for static single assignment form</a>; Thomas VanDrunen and Antony L. Hosking\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://cs.wheaton.edu/%7Etvandrun/writings/thesis.pdf">Partial Redundancy Elimination for Global Value Numbering</a>; Thomas VanDrunen\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://www.springerlink.com/content/w06m3cw453nphm1u/">Value-Based Partial Redundancy Elimination</a>; Thomas VanDrunen and Antony L. Hosking\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://portal.acm.org/citation.cfm?doid=319301.319348">Partial redundancy elimination in SSA form</a>; Robert Kennedy, Sun Chan, Shin-Ming Liu, Raymond Lo, Peng Tu, and Fred Chow\r
</p>\r
</li>\r
</ul></div>\r
</div></div>\r
<div class="paragraph"><p>Recommended Skills: SML programming experience; some middle-end compiler experience</p></div>\r
</div>\r
<div class="sect2">\r
<h3 id="_design_and_implement_a_heap_profiler">Design and Implement a Heap Profiler</h3>\r
<div class="paragraph"><p>A heap profile is a description of the space usage of a program.  A\r
heap profile is concerned with the allocation, retention, and\r
deallocation (via garbage collection) of heap data during the\r
execution of a program.  A heap profile can be used to diagnose\r
performance problems in a functional program that arise from space\r
leaks.  This project aims to design and implement a heap profiler for\r
MLton compiled programs.</p></div>\r
<div class="paragraph"><p>Background:</p></div>\r
<div class="openblock">\r
<div class="content">\r
<div class="ulist"><ul>\r
<li>\r
<p>\r
<a href="http://portal.acm.org/citation.cfm?doid=583854.582451">GCspy: an adaptable heap visualisation framework</a>; Tony Printezis and Richard Jones\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://journals.cambridge.org/action/displayAbstract?aid=1349892">New dimensions in heap profiling</a>; Colin Runciman and Niklas R&ouml;jemo\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://www.springerlink.com/content/710501660722gw37/">Heap profiling for space efficiency</a>; Colin Runciman and Niklas R&ouml;jemo\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://journals.cambridge.org/action/displayAbstract?aid=1323096">Heap profiling of lazy functional programs</a>; Colin Runciman and David Wakeling\r
</p>\r
</li>\r
</ul></div>\r
</div></div>\r
<div class="paragraph"><p>Recommended Skills: C and SML programming experience; some experience with UI and visualization</p></div>\r
</div>\r
<div class="sect2">\r
<h3 id="_garbage_collector_improvements">Garbage Collector Improvements</h3>\r
<div class="paragraph"><p>The garbage collector plays a significant role in the performance of\r
functional languages.  Garbage collect too often, and program\r
performance suffers due to the excessive time spent in the garbage\r
collector.  Garbage collect not often enough, and program performance\r
suffers due to the excessive space used by the uncollected garbage.\r
One particular issue is ensuring that a program utilizing a garbage\r
collector "plays nice" with other processes on the system, by not\r
using too much or too little physical memory.  While there are some\r
reasonable theoretical results about garbage collections with heaps of\r
fixed size, there seems to be insufficient work that really looks\r
carefully at the question of dynamically resizing the heap in response\r
to the live data demands of the application and, similarly, in\r
response to the behavior of the operating system and other processes.\r
This project aims to investigate improvements to the memory behavior of\r
MLton compiled programs through better tuning of the garbage\r
collector.</p></div>\r
<div class="paragraph"><p>Background:</p></div>\r
<div class="openblock">\r
<div class="content">\r
<div class="ulist"><ul>\r
<li>\r
<p>\r
<a href="http://www.dcs.gla.ac.uk/%7Ewhited/papers/automated_heap_sizing.pdf">Automated Heap Sizing in the Poly/ML Runtime (Position Paper)</a>; David White, Jeremy Singer, Jonathan Aitken, and David Matthews\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4145125">Isla Vista Heap Sizing: Using Feedback to Avoid Paging</a>; Chris Grzegorczyk, Sunil Soman, Chandra Krintz, and Rich Wolski\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://portal.acm.org/citation.cfm?doid=1152649.1152652">Controlling garbage collection and heap growth to reduce the execution time of Java applications</a>; Tim Brecht, Eshrat Arjomandi, Chang Li, and Hang Pham\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://portal.acm.org/citation.cfm?doid=1065010.1065028">Garbage collection without paging</a>; Matthew Hertz, Yi Feng, and Emery D. Berger\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://portal.acm.org/citation.cfm?doid=1029873.1029881">Automatic heap sizing: taking real memory into account</a>; Ting Yang, Matthew Hertz, Emery D. Berger, Scott F. Kaplan, and J. Eliot B. Moss\r
</p>\r
</li>\r
</ul></div>\r
</div></div>\r
<div class="paragraph"><p>Recommended Skills: C programming experience; some operating systems and/or systems programming experience; some compiler and garbage collector experience</p></div>\r
</div>\r
<div class="sect2">\r
<h3 id="_implement_successor_160_ml_language_features">Implement Successor&#160;ML Language Features</h3>\r
<div class="paragraph"><p>Any programming language, including Standard&#160;ML, can be improved.\r
The community has identified a number of modest extensions and\r
revisions to the Standard&#160;ML programming language that would\r
likely prove useful in practice.  This project aims to implement these\r
language features in the MLton compiler.</p></div>\r
<div class="paragraph"><p>Background:</p></div>\r
<div class="openblock">\r
<div class="content">\r
<div class="ulist"><ul>\r
<li>\r
<p>\r
<a href="http://successor-ml.org/index.php?title=Main_Page">Successor&#160;ML</a>\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://www.mpi-sws.org/%7Erossberg/hamlet/index.html#successor-ml">HaMLet (Successor&#160;ML)</a>\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://journals.cambridge.org/action/displayAbstract?aid=1322628">A critique of Standard&#160;ML</a>; Andrew W. Appel\r
</p>\r
</li>\r
</ul></div>\r
</div></div>\r
<div class="paragraph"><p>Recommended Skills: SML programming experience; some front-end compiler experience (i.e., scanners and parsers)</p></div>\r
</div>\r
<div class="sect2">\r
<h3 id="_implement_source_level_debugging">Implement Source-level Debugging</h3>\r
<div class="paragraph"><p>Debugging is a fact of programming life.  Unfortunately, most SML\r
implementations (including MLton) provide little to no source-level\r
debugging support.  This project aims to add basic to intermediate\r
source-level debugging support to the MLton compiler.  MLton already\r
supports source-level profiling, which can be used to attribute bytes\r
allocated or time spent in source functions.  It should be relatively\r
straightforward to leverage this source-level information into basic\r
source-level debugging support, with the ability to set/unset\r
breakpoints and step through declarations and functions.  It may be\r
possible to also provide intermediate source-level debugging support,\r
with the ability to inspect in-scope variables of basic types (e.g.,\r
types compatible with MLton&#8217;s foreign function interface).</p></div>\r
<div class="paragraph"><p>Background:</p></div>\r
<div class="openblock">\r
<div class="content">\r
<div class="ulist"><ul>\r
<li>\r
<p>\r
<a href="http://mlton.org/HowProfilingWorks">MLton&#8201;&#8212;&#8201;How Profiling Works</a>\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://mlton.org/ForeignFunctionInterfaceTypes">MLton&#8201;&#8212;&#8201;Foreign Function Interface Types</a>\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://dwarfstd.org/">DWARF Debugging Standard</a>\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://sourceware.org/gdb/current/onlinedocs/stabs/index.html">STABS Debugging Format</a>\r
</p>\r
</li>\r
</ul></div>\r
</div></div>\r
<div class="paragraph"><p>Recommended Skills: SML programming experience; some compiler experience</p></div>\r
</div>\r
<div class="sect2">\r
<h3 id="_region_based_memory_management">Region Based Memory Management</h3>\r
<div class="paragraph"><p>Region based memory management is an alternative automatic memory\r
management scheme to garbage collection.  Regions can be inferred by\r
the compiler (e.g., Cyclone and MLKit) or provided to the programmer\r
through a library.  Since many students do not have extensive\r
experience with compilers we plan on adopting the later approach.\r
Creating a viable region based memory solution requires the removal of\r
the GC and changes to the allocator.  Additionally, write barriers\r
will be necessary to ensure references between two ML objects is never\r
established if the left hand side of the assignment has a longer\r
lifetime than the right hand side.  Students will need to come up with\r
an appropriate interface for creating, entering, and exiting regions\r
(examples include RTSJ scoped memory and SCJ scoped memory).</p></div>\r
<div class="paragraph"><p>Background:</p></div>\r
<div class="openblock">\r
<div class="content">\r
<div class="ulist"><ul>\r
<li>\r
<p>\r
Cyclone\r
</p>\r
</li>\r
<li>\r
<p>\r
MLKit\r
</p>\r
</li>\r
<li>\r
<p>\r
RTSJ + SCJ scopes\r
</p>\r
</li>\r
</ul></div>\r
</div></div>\r
<div class="paragraph"><p>Recommended Skills: SML programming experience; C programming experience; some compiler and garbage collector experience</p></div>\r
</div>\r
<div class="sect2">\r
<h3 id="_integration_of_multi_mlton">Integration of Multi-MLton</h3>\r
<div class="paragraph"><p><a href="http://multimlton.cs.purdue.edu">MultiMLton</a> is a compiler and runtime\r
environment that targets scalable multicore platforms.  It is an\r
extension of MLton.  It combines new language abstractions and\r
associated compiler analyses for expressing and implementing various\r
kinds of fine-grained parallelism (safe futures, speculation,\r
transactions, etc.), along with a sophisticated runtime system tuned\r
to efficiently handle large numbers of lightweight threads.  The core\r
stable features of MultiMLton will need to be integrated with the\r
latest MLton public release.  Certain experimental features, such as\r
support for the Intel SCC and distributed runtime will be omitted.\r
This project requires students to understand the delta between the\r
MultiMLton code base and the MLton code base.  Students will need to\r
create build and configuration scripts for MLton to enable MultiMLton\r
features.</p></div>\r
<div class="paragraph"><p>Background</p></div>\r
<div class="openblock">\r
<div class="content">\r
<div class="ulist"><ul>\r
<li>\r
<p>\r
<a href="http://multimlton.cs.purdue.edu/mML/Publications.html">MultiMLton&#8201;&#8212;&#8201;Publications</a>\r
</p>\r
</li>\r
</ul></div>\r
</div></div>\r
<div class="paragraph"><p>Recommended Skills: SML programming experience; C programming experience; some compiler experience</p></div>\r
</div>\r
<div class="sect2">\r
<h3 id="_concurrent_160_ml_improvements">Concurrent&#160;ML Improvements</h3>\r
<div class="paragraph"><p><a href="http://cml.cs.uchicago.edu/">Concurrent ML</a> is an SML concurrency\r
library based on synchronous message passing.  MLton has a partial\r
implementation of the CML message-passing primitives, but its use in\r
real-world applications has been stymied by the lack of completeness\r
and thread-safe I/O libraries.  This project would aim to flesh out\r
the CML implementation in MLton to be fully compatible with the\r
"official" version distributed as part of SML/NJ.  Furthermore, time\r
permitting, runtime system support could be added to allow use of\r
modern OS features, such as asynchronous I/O, in the implementation of\r
CML&#8217;s system interfaces.</p></div>\r
<div class="paragraph"><p>Background</p></div>\r
<div class="openblock">\r
<div class="content">\r
<div class="ulist"><ul>\r
<li>\r
<p>\r
<a href="http://cml.cs.uchicago.edu/">http://cml.cs.uchicago.edu/</a>\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://mlton.org/ConcurrentML">http://mlton.org/ConcurrentML</a>\r
</p>\r
</li>\r
<li>\r
<p>\r
<a href="http://mlton.org/ConcurrentMLImplementation">http://mlton.org/ConcurrentMLImplementation</a>\r
</p>\r
</li>\r
</ul></div>\r
</div></div>\r
<div class="paragraph"><p>Recommended Skills: SML programming experience; knowledge of concurrent programming; some operating systems and/or systems programming experience</p></div>\r
</div>\r
</div>\r
</div>\r
</div>\r
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	22	<a href="./Home">MLton 20180207</a>\r
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	25	<div id="header">\r
	26	<h1>Google Summer of Code (2014)</h1>\r
	27	<div id="toc">
	28	<div id="toctitle">Table of Contents</div>
	29	<noscript><p><b>JavaScript must be enabled in your browser to display the table of contents.</b></p></noscript>
	30	</div>\r
	31	</div>\r
	32	<div id="content">\r
	33	<div class="sect1">\r
	34	<h2 id="_mentors">Mentors</h2>\r
	35	<div class="sectionbody">\r
	36	<div class="paragraph"><p>The following developers have agreed to serve as mentors for the 2014 Google Summer of Code:</p></div>\r
	37	<div class="ulist"><ul>\r
	38	<li>\r
	39	<p>\r
	40	<a href="http://www.cs.rit.edu/%7Emtf">Matthew Fluet</a>\r
	41	</p>\r
	42	</li>\r
	43	<li>\r
	44	<p>\r
	45	<a href="http://www.cse.buffalo.edu/%7Elziarek/">Lukasz (Luke) Ziarek</a>\r
	46	</p>\r
	47	</li>\r
	48	<li>\r
	49	<p>\r
	50	<a href="http://people.cs.uchicago.edu/~jhr/">John Reppy</a>\r
	51	</p>\r
	52	</li>\r
	53	<li>\r
	54	<p>\r
	55	<a href="http://www.cs.purdue.edu/homes/chandras">KC Sivaramakrishnan</a>\r
	56	</p>\r
	57	</li>\r
	58	</ul></div>\r
	59	</div>\r
	60	</div>\r
	61	<div class="sect1">\r
	62	<h2 id="_ideas_list">Ideas List</h2>\r
	63	<div class="sectionbody">\r
	64	<div class="sect2">\r
65	<h3 id="_implement_a_partial_redundancy_elimination_pre_optimization">Implement a Partial Redundancy Elimination (PRE) Optimization</h3>\r
66	<div class="paragraph"><p>Partial redundancy elimination (PRE) is a program transformation that\r
67	removes operations that are redundant on some, but not necessarily all\r
68	paths, through the program. PRE can subsume both common subexpression\r
69	elimination and loop-invariant code motion, and is therefore a\r
70	potentially powerful optimization. However, a naïve\r
71	implementation of PRE on a program in static single assignment (SSA)\r
72	form is unlikely to be effective. This project aims to adapt and\r
73	implement the SSAPRE algorithm(s) of Thomas VanDrunen in MLton’s SSA\r
74	intermediate language.</p></div>\r
75	<div class="paragraph"><p>Background:</p></div>\r
76	<div class="openblock">\r
77	<div class="content">\r
78	<div class="ulist"><ul>\r
79	<li>\r
80	<p>\r
81	<a href="http://onlinelibrary.wiley.com/doi/10.1002/spe.618/abstract">Anticipation-based partial redundancy elimination for static single assignment form</a>; Thomas VanDrunen and Antony L. Hosking\r
82	</p>\r
83	</li>\r
84	<li>\r
85	<p>\r
86	<a href="http://cs.wheaton.edu/%7Etvandrun/writings/thesis.pdf">Partial Redundancy Elimination for Global Value Numbering</a>; Thomas VanDrunen\r
87	</p>\r
88	</li>\r
89	<li>\r
90	<p>\r
91	<a href="http://www.springerlink.com/content/w06m3cw453nphm1u/">Value-Based Partial Redundancy Elimination</a>; Thomas VanDrunen and Antony L. Hosking\r
92	</p>\r
93	</li>\r
94	<li>\r
95	<p>\r
96	<a href="http://portal.acm.org/citation.cfm?doid=319301.319348">Partial redundancy elimination in SSA form</a>; Robert Kennedy, Sun Chan, Shin-Ming Liu, Raymond Lo, Peng Tu, and Fred Chow\r
97	</p>\r
98	</li>\r
99	</ul></div>\r
100	</div></div>\r
101	<div class="paragraph"><p>Recommended Skills: SML programming experience; some middle-end compiler experience</p></div>\r
102	</div>\r
103	<div class="sect2">\r
104	<h3 id="_design_and_implement_a_heap_profiler">Design and Implement a Heap Profiler</h3>\r
105	<div class="paragraph"><p>A heap profile is a description of the space usage of a program. A\r
106	heap profile is concerned with the allocation, retention, and\r
107	deallocation (via garbage collection) of heap data during the\r
108	execution of a program. A heap profile can be used to diagnose\r
109	performance problems in a functional program that arise from space\r
110	leaks. This project aims to design and implement a heap profiler for\r
111	MLton compiled programs.</p></div>\r
112	<div class="paragraph"><p>Background:</p></div>\r
113	<div class="openblock">\r
114	<div class="content">\r
115	<div class="ulist"><ul>\r
116	<li>\r
117	<p>\r
118	<a href="http://portal.acm.org/citation.cfm?doid=583854.582451">GCspy: an adaptable heap visualisation framework</a>; Tony Printezis and Richard Jones\r
119	</p>\r
120	</li>\r
121	<li>\r
122	<p>\r
123	<a href="http://journals.cambridge.org/action/displayAbstract?aid=1349892">New dimensions in heap profiling</a>; Colin Runciman and Niklas Röjemo\r
124	</p>\r
125	</li>\r
126	<li>\r
127	<p>\r
128	<a href="http://www.springerlink.com/content/710501660722gw37/">Heap profiling for space efficiency</a>; Colin Runciman and Niklas Röjemo\r
129	</p>\r
130	</li>\r
131	<li>\r
132	<p>\r
133	<a href="http://journals.cambridge.org/action/displayAbstract?aid=1323096">Heap profiling of lazy functional programs</a>; Colin Runciman and David Wakeling\r
134	</p>\r
135	</li>\r
136	</ul></div>\r
137	</div></div>\r
138	<div class="paragraph"><p>Recommended Skills: C and SML programming experience; some experience with UI and visualization</p></div>\r
139	</div>\r
140	<div class="sect2">\r
141	<h3 id="_garbage_collector_improvements">Garbage Collector Improvements</h3>\r
142	<div class="paragraph"><p>The garbage collector plays a significant role in the performance of\r
143	functional languages. Garbage collect too often, and program\r
144	performance suffers due to the excessive time spent in the garbage\r
145	collector. Garbage collect not often enough, and program performance\r
146	suffers due to the excessive space used by the uncollected garbage.\r
147	One particular issue is ensuring that a program utilizing a garbage\r
148	collector "plays nice" with other processes on the system, by not\r
149	using too much or too little physical memory. While there are some\r
150	reasonable theoretical results about garbage collections with heaps of\r
151	fixed size, there seems to be insufficient work that really looks\r
152	carefully at the question of dynamically resizing the heap in response\r
153	to the live data demands of the application and, similarly, in\r
154	response to the behavior of the operating system and other processes.\r
155	This project aims to investigate improvements to the memory behavior of\r
156	MLton compiled programs through better tuning of the garbage\r
157	collector.</p></div>\r
158	<div class="paragraph"><p>Background:</p></div>\r
159	<div class="openblock">\r
160	<div class="content">\r
161	<div class="ulist"><ul>\r
162	<li>\r
163	<p>\r
164	<a href="http://www.dcs.gla.ac.uk/%7Ewhited/papers/automated_heap_sizing.pdf">Automated Heap Sizing in the Poly/ML Runtime (Position Paper)</a>; David White, Jeremy Singer, Jonathan Aitken, and David Matthews\r
165	</p>\r
166	</li>\r
167	<li>\r
168	<p>\r
169	<a href="http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4145125">Isla Vista Heap Sizing: Using Feedback to Avoid Paging</a>; Chris Grzegorczyk, Sunil Soman, Chandra Krintz, and Rich Wolski\r
170	</p>\r
171	</li>\r
172	<li>\r
173	<p>\r
174	<a href="http://portal.acm.org/citation.cfm?doid=1152649.1152652">Controlling garbage collection and heap growth to reduce the execution time of Java applications</a>; Tim Brecht, Eshrat Arjomandi, Chang Li, and Hang Pham\r
175	</p>\r
176	</li>\r
177	<li>\r
178	<p>\r
179	<a href="http://portal.acm.org/citation.cfm?doid=1065010.1065028">Garbage collection without paging</a>; Matthew Hertz, Yi Feng, and Emery D. Berger\r
180	</p>\r
181	</li>\r
182	<li>\r
183	<p>\r
184	<a href="http://portal.acm.org/citation.cfm?doid=1029873.1029881">Automatic heap sizing: taking real memory into account</a>; Ting Yang, Matthew Hertz, Emery D. Berger, Scott F. Kaplan, and J. Eliot B. Moss\r
185	</p>\r
186	</li>\r
187	</ul></div>\r
188	</div></div>\r
189	<div class="paragraph"><p>Recommended Skills: C programming experience; some operating systems and/or systems programming experience; some compiler and garbage collector experience</p></div>\r
190	</div>\r
191	<div class="sect2">\r
192	<h3 id="_implement_successor_160_ml_language_features">Implement Successor ML Language Features</h3>\r
193	<div class="paragraph"><p>Any programming language, including Standard ML, can be improved.\r
194	The community has identified a number of modest extensions and\r
195	revisions to the Standard ML programming language that would\r
196	likely prove useful in practice. This project aims to implement these\r
197	language features in the MLton compiler.</p></div>\r
198	<div class="paragraph"><p>Background:</p></div>\r
199	<div class="openblock">\r
200	<div class="content">\r
201	<div class="ulist"><ul>\r
202	<li>\r
203	<p>\r
204	<a href="http://successor-ml.org/index.php?title=Main_Page">Successor ML</a>\r
205	</p>\r
206	</li>\r
207	<li>\r
208	<p>\r
209	<a href="http://www.mpi-sws.org/%7Erossberg/hamlet/index.html#successor-ml">HaMLet (Successor ML)</a>\r
210	</p>\r
211	</li>\r
212	<li>\r
213	<p>\r
214	<a href="http://journals.cambridge.org/action/displayAbstract?aid=1322628">A critique of Standard ML</a>; Andrew W. Appel\r
215	</p>\r
216	</li>\r
217	</ul></div>\r
218	</div></div>\r
219	<div class="paragraph"><p>Recommended Skills: SML programming experience; some front-end compiler experience (i.e., scanners and parsers)</p></div>\r
220	</div>\r
221	<div class="sect2">\r
222	<h3 id="_implement_source_level_debugging">Implement Source-level Debugging</h3>\r
223	<div class="paragraph"><p>Debugging is a fact of programming life. Unfortunately, most SML\r
224	implementations (including MLton) provide little to no source-level\r
225	debugging support. This project aims to add basic to intermediate\r
226	source-level debugging support to the MLton compiler. MLton already\r
227	supports source-level profiling, which can be used to attribute bytes\r
228	allocated or time spent in source functions. It should be relatively\r
229	straightforward to leverage this source-level information into basic\r
230	source-level debugging support, with the ability to set/unset\r
231	breakpoints and step through declarations and functions. It may be\r
232	possible to also provide intermediate source-level debugging support,\r
233	with the ability to inspect in-scope variables of basic types (e.g.,\r
234	types compatible with MLton’s foreign function interface).</p></div>\r
235	<div class="paragraph"><p>Background:</p></div>\r
236	<div class="openblock">\r
237	<div class="content">\r
238	<div class="ulist"><ul>\r
239	<li>\r
240	<p>\r
241	<a href="http://mlton.org/HowProfilingWorks">MLton — How Profiling Works</a>\r
242	</p>\r
243	</li>\r
244	<li>\r
245	<p>\r
246	<a href="http://mlton.org/ForeignFunctionInterfaceTypes">MLton — Foreign Function Interface Types</a>\r
247	</p>\r
248	</li>\r
249	<li>\r
250	<p>\r
251	<a href="http://dwarfstd.org/">DWARF Debugging Standard</a>\r
252	</p>\r
253	</li>\r
254	<li>\r
255	<p>\r
256	<a href="http://sourceware.org/gdb/current/onlinedocs/stabs/index.html">STABS Debugging Format</a>\r
257	</p>\r
258	</li>\r
259	</ul></div>\r
260	</div></div>\r
261	<div class="paragraph"><p>Recommended Skills: SML programming experience; some compiler experience</p></div>\r
262	</div>\r
263	<div class="sect2">\r
264	<h3 id="_region_based_memory_management">Region Based Memory Management</h3>\r
265	<div class="paragraph"><p>Region based memory management is an alternative automatic memory\r
266	management scheme to garbage collection. Regions can be inferred by\r
267	the compiler (e.g., Cyclone and MLKit) or provided to the programmer\r
268	through a library. Since many students do not have extensive\r
269	experience with compilers we plan on adopting the later approach.\r
270	Creating a viable region based memory solution requires the removal of\r
271	the GC and changes to the allocator. Additionally, write barriers\r
272	will be necessary to ensure references between two ML objects is never\r
273	established if the left hand side of the assignment has a longer\r
274	lifetime than the right hand side. Students will need to come up with\r
275	an appropriate interface for creating, entering, and exiting regions\r
276	(examples include RTSJ scoped memory and SCJ scoped memory).</p></div>\r
277	<div class="paragraph"><p>Background:</p></div>\r
278	<div class="openblock">\r
279	<div class="content">\r
280	<div class="ulist"><ul>\r
281	<li>\r
282	<p>\r
283	Cyclone\r
284	</p>\r
285	</li>\r
286	<li>\r
287	<p>\r
288	MLKit\r
289	</p>\r
290	</li>\r
291	<li>\r
292	<p>\r
293	RTSJ + SCJ scopes\r
294	</p>\r
295	</li>\r
296	</ul></div>\r
297	</div></div>\r
298	<div class="paragraph"><p>Recommended Skills: SML programming experience; C programming experience; some compiler and garbage collector experience</p></div>\r
299	</div>\r
300	<div class="sect2">\r
301	<h3 id="_integration_of_multi_mlton">Integration of Multi-MLton</h3>\r
302	<div class="paragraph"><p><a href="http://multimlton.cs.purdue.edu">MultiMLton</a> is a compiler and runtime\r
303	environment that targets scalable multicore platforms. It is an\r
304	extension of MLton. It combines new language abstractions and\r
305	associated compiler analyses for expressing and implementing various\r
306	kinds of fine-grained parallelism (safe futures, speculation,\r
307	transactions, etc.), along with a sophisticated runtime system tuned\r
308	to efficiently handle large numbers of lightweight threads. The core\r
309	stable features of MultiMLton will need to be integrated with the\r
310	latest MLton public release. Certain experimental features, such as\r
311	support for the Intel SCC and distributed runtime will be omitted.\r
312	This project requires students to understand the delta between the\r
313	MultiMLton code base and the MLton code base. Students will need to\r
314	create build and configuration scripts for MLton to enable MultiMLton\r
315	features.</p></div>\r
316	<div class="paragraph"><p>Background</p></div>\r
317	<div class="openblock">\r
318	<div class="content">\r
319	<div class="ulist"><ul>\r
320	<li>\r
321	<p>\r
322	<a href="http://multimlton.cs.purdue.edu/mML/Publications.html">MultiMLton — Publications</a>\r
323	</p>\r
324	</li>\r
325	</ul></div>\r
326	</div></div>\r
327	<div class="paragraph"><p>Recommended Skills: SML programming experience; C programming experience; some compiler experience</p></div>\r
328	</div>\r
329	<div class="sect2">\r
330	<h3 id="_concurrent_160_ml_improvements">Concurrent ML Improvements</h3>\r
331	<div class="paragraph"><p><a href="http://cml.cs.uchicago.edu/">Concurrent ML</a> is an SML concurrency\r
332	library based on synchronous message passing. MLton has a partial\r
333	implementation of the CML message-passing primitives, but its use in\r
334	real-world applications has been stymied by the lack of completeness\r
335	and thread-safe I/O libraries. This project would aim to flesh out\r
336	the CML implementation in MLton to be fully compatible with the\r
337	"official" version distributed as part of SML/NJ. Furthermore, time\r
338	permitting, runtime system support could be added to allow use of\r
339	modern OS features, such as asynchronous I/O, in the implementation of\r
340	CML’s system interfaces.</p></div>\r
341	<div class="paragraph"><p>Background</p></div>\r
342	<div class="openblock">\r
343	<div class="content">\r
344	<div class="ulist"><ul>\r
345	<li>\r
346	<p>\r
347	<a href="http://cml.cs.uchicago.edu/">http://cml.cs.uchicago.edu/</a>\r
348	</p>\r
349	</li>\r
350	<li>\r
351	<p>\r
352	<a href="http://mlton.org/ConcurrentML">http://mlton.org/ConcurrentML</a>\r
353	</p>\r
354	</li>\r
355	<li>\r
356	<p>\r
357	<a href="http://mlton.org/ConcurrentMLImplementation">http://mlton.org/ConcurrentMLImplementation</a>\r
358	</p>\r
359	</li>\r
360	</ul></div>\r
361	</div></div>\r
362	<div class="paragraph"><p>Recommended Skills: SML programming experience; knowledge of concurrent programming; some operating systems and/or systems programming experience</p></div>\r
363	</div>\r
364	</div>\r
365	</div>\r
366	</div>\r
367	<div id="footnotes"><hr></div>\r
368	<div id="footer">\r
369	<div id="footer-text">\r
370	</div>\r
371	<div id="footer-badges">\r
372	</div>\r
373	</div>\r
374	</body>\r
375	</html>\r