Annotation of /branches/vis12/src/compiler/c-target/c-target.sml

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1 :	jhr	1115	(* c-target.sml
2 :			*
3 :			* COPYRIGHT (c) 2011 The Diderot Project (http://diderot-language.cs.uchicago.edu)
4 :			* All rights reserved.
5 :			*)
6 :
7 :			structure CTarget : TARGET =
8 :			struct
9 :
10 :			structure IL = TreeIL
11 :			structure V = IL.Var
12 :			structure Ty = IL.Ty
13 :			structure CL = CLang
14 :	jhr	1376	structure N = CNames
15 :	jhr	1115
16 :	jhr	1716	type target_desc = TargetUtil.target_desc
17 :
18 :	jhr	1640	(* variable translation *)
19 :			structure TrVar =
20 :			struct
21 :			type env = CL.typed_var TreeIL.Var.Map.map
22 :			fun lookup (env, x) = (case V.Map.find (env, x)
23 :			of SOME(CL.V(_, x')) => x'
24 :			| NONE => raise Fail(concat["lookup(_, ", V.name x, ")"])
25 :			(* end case *))
26 :			(* translate a variable that occurs in an l-value context (i.e., as the target of an assignment) *)
27 :	jhr	1706	fun lvalueVar (env, x) = CL.mkVar(lookup(env, x))
28 :	jhr	1640	(* translate a variable that occurs in an r-value context *)
29 :	jhr	1706	fun rvalueVar (env, x) = CL.mkVar(lookup(env, x))
30 :	jhr	1640	(* translate a strand state variable that occurs in an l-value context *)
31 :			fun lvalueStateVar x = CL.mkIndirect(CL.mkVar "selfOut", IL.StateVar.name x)
32 :			(* translate a strand state variable that occurs in an r-value context *)
33 :			fun rvalueStateVar x = CL.mkIndirect(CL.mkVar "selfIn", IL.StateVar.name x)
34 :			end
35 :
36 :			structure ToC = TreeToCFn (TrVar)
37 :
38 :			type var = CL.typed_var
39 :	jhr	1115	type exp = CL.exp
40 :			type stm = CL.stm
41 :
42 :			datatype strand = Strand of {
43 :	jhr	1375	name : string,
44 :			tyName : string,
45 :	jhr	1640	state : var list,
46 :			output : (Ty.ty * CL.var), (* the strand's output variable (only one for now) *)
47 :	jhr	1375	code : CL.decl list ref
48 :	jhr	1115	}
49 :
50 :			datatype program = Prog of {
51 :	jhr	1716	tgt : target_desc, (* info about target *)
52 :	jhr	1375	globals : CL.decl list ref,
53 :			topDecls : CL.decl list ref,
54 :			strands : strand AtomTable.hash_table,
55 :	jhr	1713	nAxes : int option ref, (* number of axes in initial grid (NONE means collection) *)
56 :	jhr	1375	initially : CL.decl ref
57 :	jhr	1115	}
58 :
59 :			datatype env = ENV of {
60 :	jhr	1375	info : env_info,
61 :			vMap : var V.Map.map,
62 :			scope : scope
63 :	jhr	1115	}
64 :
65 :			and env_info = INFO of {
66 :	jhr	1375	prog : program
67 :	jhr	1115	}
68 :
69 :			and scope
70 :			= NoScope
71 :			| GlobalScope
72 :			| InitiallyScope
73 :	jhr	1640	| StrandScope (* strand initialization *)
74 :			| MethodScope of StrandUtil.method_name (* method body; vars are state variables *)
75 :	jhr	1115
76 :			(* the supprted widths of vectors of reals on the target. For the GNU vector extensions,
77 :			* the supported sizes are powers of two, but float2 is broken.
78 :			* NOTE: we should also consider the AVX vector hardware, which has 256-bit registers.
79 :			*)
80 :	jhr	1376	fun vectorWidths () = if !N.doublePrecision
81 :	jhr	1375	then [2, 4, 8]
82 :			else [4, 8]
83 :	jhr	1115
84 :	jhr	1640	(* we support printing in the sequential C target *)
85 :			val supportsPrinting = true
86 :
87 :	jhr	1115	(* tests for whether various expression forms can appear inline *)
88 :	jhr	1375	fun inlineCons n = (n < 2) (* vectors are inline, but not matrices *)
89 :			val inlineMatrixExp = false (* can matrix-valued expressions appear inline? *)
90 :	jhr	1115
91 :			(* TreeIL to target translations *)
92 :			structure Tr =
93 :			struct
94 :	jhr	1375	fun fragment (ENV{info, vMap, scope}, blk) = let
95 :			val (vMap, stms) = ToC.trFragment (vMap, blk)
96 :			in
97 :			(ENV{info=info, vMap=vMap, scope=scope}, stms)
98 :			end
99 :	jhr	1640	(* NOTE: we may be able to simplify the interface to ToC.trBlock! *)
100 :			fun block (ENV{vMap, ...}, blk) = ToC.trBlock (vMap, blk)
101 :	jhr	1375	fun exp (ENV{vMap, ...}, e) = ToC.trExp(vMap, e)
102 :	jhr	1115	end
103 :
104 :			(* variables *)
105 :			structure Var =
106 :			struct
107 :	jhr	1640	fun name (CL.V(_, name)) = name
108 :	jhr	1375	fun global (Prog{globals, ...}, name, ty) = let
109 :			val ty' = ToC.trType ty
110 :			in
111 :			globals := CL.D_Var([], ty', name, NONE) :: !globals;
112 :	jhr	1640	CL.V(ty', name)
113 :	jhr	1375	end
114 :	jhr	1640	fun param x = CL.V(ToC.trType(V.ty x), V.name x)
115 :	jhr	1115	end
116 :
117 :			(* environments *)
118 :			structure Env =
119 :			struct
120 :			(* create a new environment *)
121 :	jhr	1375	fun new prog = ENV{
122 :			info=INFO{prog = prog},
123 :			vMap = V.Map.empty,
124 :			scope = NoScope
125 :			}
126 :	jhr	1115	(* define the current translation context *)
127 :	jhr	1375	fun setScope scope (ENV{info, vMap, ...}) = ENV{info=info, vMap=vMap, scope=scope}
128 :			val scopeGlobal = setScope GlobalScope
129 :			val scopeInitially = setScope InitiallyScope
130 :	jhr	1640	fun scopeStrand env = setScope StrandScope env
131 :			fun scopeMethod (env, name) = setScope (MethodScope name) env
132 :	jhr	1115	(* bind a TreeIL varaiable to a target variable *)
133 :	jhr	1375	fun bind (ENV{info, vMap, scope}, x, x') = ENV{
134 :			info = info,
135 :			vMap = V.Map.insert(vMap, x, x'),
136 :			scope = scope
137 :			}
138 :	jhr	1115	end
139 :
140 :			(* programs *)
141 :			structure Program =
142 :			struct
143 :	jhr	1716	fun new (tgt : target_desc) = let
144 :			(*
145 :	jhr	1705	val includes = if #exec tgt
146 :			then ["#include \"Diderot/diderot.h\"\n"]
147 :			else [
148 :			"#include \"",
149 :			OS.Path.joinBaseExt{base= #outBase tgt, ext= SOME "h"},
150 :			"\"\n"
151 :			]
152 :	jhr	1716	*)
153 :	jhr	1705	in
154 :			N.initTargetSpec {double= #double tgt, long=false};
155 :			Prog{
156 :			tgt = tgt,
157 :	jhr	1716	globals = ref [
158 :			CL.D_Var(["static"], CL.charPtr, "ProgramName",
159 :			SOME(CL.I_Exp(CL.mkStr(#srcFile tgt))))
160 :			],
161 :			(*
162 :	jhr	1705	globals = ref [ (* NOTE: in reverse order! *)
163 :			CL.D_Var(["static"], CL.charPtr, "ProgramName",
164 :			SOME(CL.I_Exp(CL.mkStr(#srcFile tgt)))),
165 :			CL.D_Verbatim([
166 :	jhr	1706	concat["#define " ^ TargetUtil.floatPrecisionDef tgt, "\n"],
167 :			concat["#define " ^ TargetUtil.intPrecisionDef tgt, "\n"],
168 :			concat["#define " ^ TargetUtil.targetDef tgt, "\n"]
169 :	jhr	1705	] @ includes)
170 :			],
171 :	jhr	1716	*)
172 :	jhr	1705	topDecls = ref [],
173 :			strands = AtomTable.mkTable (16, Fail "strand table"),
174 :	jhr	1713	nAxes = ref(SOME ~1),
175 :	jhr	1705	initially = ref(CL.D_Comment["missing initially"])
176 :			}
177 :			end
178 :	jhr	1301	(* register the code that is used to register command-line options for input variables *)
179 :	jhr	1375	fun inputs (Prog{topDecls, ...}, stm) = let
180 :			val inputsFn = CL.D_Func(
181 :	jhr	1376	[], CL.voidTy, N.registerOpts,
182 :			[CL.PARAM([], CL.T_Ptr(CL.T_Named N.optionsTy), "opts")],
183 :	jhr	1375	stm)
184 :			in
185 :			topDecls := inputsFn :: !topDecls
186 :			end
187 :	jhr	1115	(* register the global initialization part of a program *)
188 :	jhr	1375	fun init (Prog{topDecls, ...}, init) = let
189 :	jhr	1376	val initFn = CL.D_Func([], CL.voidTy, N.initGlobals, [], init)
190 :	jhr	1375	val shutdownFn = CL.D_Func(
191 :	jhr	1376	[], CL.voidTy, N.shutdown,
192 :			[CL.PARAM([], CL.T_Ptr(CL.T_Named N.worldTy), "wrld")],
193 :	jhr	1375	CL.S_Block[])
194 :			in
195 :			topDecls := shutdownFn :: initFn :: !topDecls
196 :			end
197 :	jhr	1115	(* create and register the initially function for a program *)
198 :	jhr	1375	fun initially {
199 :	jhr	1713	prog = Prog{strands, nAxes, initially, ...},
200 :	jhr	1375	isArray : bool,
201 :			iterPrefix : stm list,
202 :			iters : (var * exp * exp) list,
203 :			createPrefix : stm list,
204 :			strand : Atom.atom,
205 :			args : exp list
206 :			} = let
207 :			val name = Atom.toString strand
208 :			val nDims = List.length iters
209 :	jhr	1376	val worldTy = CL.T_Ptr(CL.T_Named N.worldTy)
210 :	jhr	1375	fun mapi f xs = let
211 :			fun mapf (_, []) = []
212 :			| mapf (i, x::xs) = f(i, x) :: mapf(i+1, xs)
213 :			in
214 :			mapf (0, xs)
215 :			end
216 :			val baseInit = mapi (fn (i, (_, e, _)) => (i, CL.I_Exp e)) iters
217 :			val sizeInit = mapi
218 :	jhr	1640	(fn (i, (CL.V(ty, _), lo, hi)) =>
219 :	jhr	1375	(i, CL.I_Exp(CL.mkBinOp(CL.mkBinOp(hi, CL.#-, lo), CL.#+, CL.E_Int(1, ty))))
220 :			) iters
221 :			(* code to allocate the world and initial strands *)
222 :			val wrld = "wrld"
223 :			val allocCode = [
224 :			CL.mkComment["allocate initial block of strands"],
225 :			CL.mkDecl(CL.T_Array(CL.int32, SOME nDims), "base", SOME(CL.I_Array baseInit)),
226 :			CL.mkDecl(CL.T_Array(CL.uint32, SOME nDims), "size", SOME(CL.I_Array sizeInit)),
227 :			CL.mkDecl(worldTy, wrld,
228 :	jhr	1376	SOME(CL.I_Exp(CL.E_Apply(N.allocInitially, [
229 :	jhr	1375	CL.mkVar "ProgramName",
230 :	jhr	1376	CL.mkUnOp(CL.%&, CL.E_Var(N.strandDesc name)),
231 :	jhr	1375	CL.E_Bool isArray,
232 :			CL.E_Int(IntInf.fromInt nDims, CL.int32),
233 :			CL.E_Var "base",
234 :			CL.E_Var "size"
235 :			]))))
236 :			]
237 :			(* create the loop nest for the initially iterations *)
238 :			val indexVar = "ix"
239 :	jhr	1376	val strandTy = CL.T_Ptr(CL.T_Named(N.strandTy name))
240 :	jhr	1375	fun mkLoopNest [] = CL.mkBlock(createPrefix @ [
241 :			CL.mkDecl(strandTy, "sp",
242 :			SOME(CL.I_Exp(
243 :			CL.E_Cast(strandTy,
244 :	jhr	1376	CL.E_Apply(N.inState, [CL.E_Var "wrld", CL.E_Var indexVar]))))),
245 :			CL.mkCall(N.strandInit name, CL.E_Var "sp" :: args),
246 :	jhr	1375	CL.mkAssign(CL.E_Var indexVar, CL.mkBinOp(CL.E_Var indexVar, CL.#+, CL.E_Int(1, CL.uint32)))
247 :			])
248 :	jhr	1640	| mkLoopNest ((CL.V(ty, param), lo, hi)::iters) = let
249 :	jhr	1375	val body = mkLoopNest iters
250 :			in
251 :			CL.mkFor(
252 :			[(ty, param, lo)],
253 :			CL.mkBinOp(CL.E_Var param, CL.#<=, hi),
254 :			[CL.mkPostOp(CL.E_Var param, CL.^++)],
255 :			body)
256 :			end
257 :			val iterCode = [
258 :			CL.mkComment["initially"],
259 :			CL.mkDecl(CL.uint32, indexVar, SOME(CL.I_Exp(CL.E_Int(0, CL.uint32)))),
260 :			mkLoopNest iters
261 :			]
262 :			val body = CL.mkBlock(
263 :	jhr	1301	iterPrefix @
264 :			allocCode @
265 :			iterCode @
266 :			[CL.mkReturn(SOME(CL.E_Var "wrld"))])
267 :	jhr	1376	val initFn = CL.D_Func([], worldTy, N.initially, [], body)
268 :	jhr	1375	in
269 :	jhr	1713	nAxes := (if isArray then SOME nDims else NONE);
270 :	jhr	1375	initially := initFn
271 :			end
272 :	jhr	1115
273 :			(***** OUTPUT *****)
274 :	jhr	1716
275 :			fun genStrand (tgt : target_desc, Strand{name, tyName, state, output, code}) = let
276 :	jhr	1375	(* the type declaration for the strand's state struct *)
277 :			val selfTyDef = CL.D_StructDef(
278 :	jhr	1716	SOME(concat[#namespace tgt, "struct_", name]),
279 :	jhr	1640	List.rev (List.map (fn CL.V(ty, x) => (ty, x)) state),
280 :	jhr	1716	NONE)
281 :	jhr	1640	(* the type and access expression for the strand's output variable *)
282 :			val (outTy, outState) = (#1 output, CL.mkIndirect(CL.mkVar "self", #2 output))
283 :	jhr	1375	(* the strand's descriptor object *)
284 :			val descI = let
285 :			fun fnPtr (ty, f) = CL.I_Exp(CL.mkCast(CL.T_Named ty, CL.mkVar f))
286 :	jhr	1640	val nrrdTy = NrrdTypes.toNrrdType outTy
287 :			val nrrdSize = NrrdTypes.toNrrdSize outTy
288 :			in
289 :			CL.I_Struct[
290 :			("name", CL.I_Exp(CL.mkStr name)),
291 :			("stateSzb", CL.I_Exp(CL.mkSizeof(CL.T_Named(N.strandTy name)))),
292 :			("update", fnPtr("update_method_t", name ^ "_Update")),
293 :	jhr	1716	("stabilize", fnPtr("stabilize_method_t", name ^ "_Stabilize"))
294 :	jhr	1640	]
295 :			end
296 :	jhr	1376	val desc = CL.D_Var([], CL.T_Named N.strandDescTy, N.strandDesc name, SOME descI)
297 :	jhr	1375	in
298 :	jhr	1716	selfTyDef :: List.rev (desc :: !code)
299 :	jhr	1375	end
300 :	jhr	1115
301 :	jhr	1716	(* FIXME: this function will also be used for other targets, so we should pull it into a
302 :			* utility module in c-util.
303 :			*)
304 :			(* generate the struct declaration for the world representation *)
305 :			fun genWorldStruct (tgt : target_desc, Strand{tyName, ...}) = CL.D_StructDef(
306 :			SOME(#namespace tgt ^ "struct_world"),
307 :			[
308 :			(CL.T_Ptr(CL.T_Named "const char"), "name"),
309 :			(CL.charPtr, "err"),
310 :			(CL.boolTy, "isArray"),
311 :			(CL.uint32, "nStrands"),
312 :			(CL.T_Ptr(CL.T_Named "Strand_t"), "strandDesc"),
313 :			(CL.uint32, "nAxes"),
314 :			(CL.T_Ptr CL.uint32, "base"),
315 :			(CL.T_Ptr CL.uint32, "size"),
316 :			(CL.uint32, "numStrands"),
317 :			(CL.T_Ptr CL.uint8, "status"),
318 :			(CL.T_Ptr(CL.T_Ptr(CL.T_Named tyName)), "inState"),
319 :			(CL.T_Ptr(CL.T_Ptr(CL.T_Named tyName)), "outState")
320 :			],
321 :			NONE)
322 :
323 :	jhr	1115	(* generate the table of strand descriptors *)
324 :	jhr	1716	fun ppStrandTable (ppStrm, strands) = let
325 :	jhr	1375	val nStrands = length strands
326 :	jhr	1376	fun genInit (Strand{name, ...}) = CL.I_Exp(CL.mkUnOp(CL.%&, CL.E_Var(N.strandDesc name)))
327 :	jhr	1375	fun genInits (_, []) = []
328 :			| genInits (i, s::ss) = (i, genInit s) :: genInits(i+1, ss)
329 :			fun ppDecl dcl = PrintAsC.output(ppStrm, dcl)
330 :			in
331 :	jhr	1376	ppDecl (CL.D_Var([], CL.int32, N.numStrands,
332 :	jhr	1375	SOME(CL.I_Exp(CL.E_Int(IntInf.fromInt nStrands, CL.int32)))));
333 :			ppDecl (CL.D_Var([],
334 :	jhr	1376	CL.T_Array(CL.T_Ptr(CL.T_Named N.strandDescTy), SOME nStrands),
335 :			N.strands,
336 :	jhr	1375	SOME(CL.I_Array(genInits (0, strands)))))
337 :			end
338 :	jhr	1115
339 :	jhr	1713	fun genExecSrc (baseName, prog) = let
340 :	jhr	1716	val Prog{tgt, globals, topDecls, strands, initially, ...} = prog
341 :	jhr	1375	val fileName = OS.Path.joinBaseExt{base=baseName, ext=SOME "c"}
342 :			val outS = TextIO.openOut fileName
343 :			val ppStrm = PrintAsC.new outS
344 :			fun ppDecl dcl = PrintAsC.output(ppStrm, dcl)
345 :			val strands = AtomTable.listItems strands
346 :			in
347 :			List.app ppDecl (List.rev (!globals));
348 :			List.app ppDecl (List.rev (!topDecls));
349 :	jhr	1716	List.app (fn strand => List.app ppDecl (genStrand(tgt, strand))) strands;
350 :			ppStrandTable (ppStrm, strands);
351 :	jhr	1375	ppDecl (!initially);
352 :			PrintAsC.close ppStrm;
353 :			TextIO.closeOut outS
354 :			end
355 :	jhr	1115
356 :	jhr	1714	fun condCons (true, x, xs) = x::xs
357 :			| condCons (false, _, xs) = xs
358 :
359 :	jhr	1716	fun compile (tgt : target_desc, basename) = let
360 :	jhr	1375	(* generate the C compiler flags *)
361 :			val cflags = ["-I" ^ Paths.diderotInclude, "-I" ^ Paths.teemInclude]
362 :	jhr	1714	val cflags = condCons (#parallel tgt, #pthread Paths.cflags, cflags)
363 :			val cflags = if #debug tgt
364 :	jhr	1375	then #debug Paths.cflags :: cflags
365 :			else #ndebug Paths.cflags :: cflags
366 :			val cflags = #base Paths.cflags :: cflags
367 :	jhr	1714	in
368 :			RunCC.compile (basename, cflags)
369 :			end
370 :
371 :	jhr	1716	fun ldFlags (tgt : target_desc) = let
372 :	jhr	1714	val extraLibs = condCons (#parallel tgt, #pthread Paths.extraLibs, [])
373 :	jhr	1375	val extraLibs = Paths.teemLinkFlags @ #base Paths.extraLibs :: extraLibs
374 :	jhr	1706	val rtLib = TargetUtil.runtimeName tgt
375 :	jhr	1714	in
376 :			rtLib :: extraLibs
377 :			end
378 :
379 :			(* output the code to a file. The string is the basename of the file, the extension
380 :			* is provided by the target.
381 :			*)
382 :			fun generateExec (prog as Prog{tgt, ...}) = let
383 :			val {outDir, outBase, exec, double, parallel, debug, ...} = tgt
384 :	jhr	1705	val basename = OS.Path.joinDirFile{dir=outDir, file=outBase}
385 :	jhr	1375	in
386 :	jhr	1713	genExecSrc (basename, prog);
387 :	jhr	1714	compile (tgt, basename);
388 :			RunCC.linkExec (basename, ldFlags tgt)
389 :	jhr	1375	end
390 :	jhr	1115
391 :	jhr	1716	fun outputLibSrc (baseName, Prog{tgt, globals, strands, nAxes, ...}) = let
392 :			val [strand as Strand{name, tyName, state, output, ...}] = AtomTable.listItems strands
393 :	jhr	1713	val outputs = List.map (GenOutput.gen (tgt, !nAxes)) [output]
394 :			(* output to C file *)
395 :			val fileName = OS.Path.joinBaseExt{base=baseName, ext=SOME "c"}
396 :			val outS = TextIO.openOut fileName
397 :			val ppStrm = PrintAsC.new outS
398 :			fun ppDecl dcl = PrintAsC.output(ppStrm, dcl)
399 :			in
400 :	jhr	1716	(* FIXME: use a fragment for this part of the file *)
401 :			ppDecl (CL.D_Verbatim [
402 :			"#include \"", OS.Path.joinBaseExt{base= #outBase tgt, ext= SOME "h"}, "\"\n",
403 :			"#include \"teem/nrrd.h\"\n",
404 :			"#include \"teem/biff.h\"\n",
405 :			"typedef struct ", #namespace tgt, "struct_", name, " ", tyName, ";\n"
406 :			]);
407 :			ppDecl (genWorldStruct(tgt, strand));
408 :	jhr	1715	List.app ppDecl (List.rev (!globals));
409 :	jhr	1716	List.app ppDecl (genStrand(tgt, strand));
410 :	jhr	1714	List.app ppDecl outputs;
411 :			PrintAsC.close ppStrm;
412 :			TextIO.closeOut outS
413 :	jhr	1713	end
414 :
415 :	jhr	1706	fun generateLib (prog as Prog{tgt, strands, ...}) = let
416 :			val {outDir, outBase, exec, double, parallel, debug, ...} = tgt
417 :			val basename = OS.Path.joinDirFile{dir=outDir, file=outBase}
418 :			val [Strand{state, output, ...}] = AtomTable.listItems strands
419 :			in
420 :	jhr	1713	(* generate the library .h file *)
421 :	jhr	1706	GenLibraryInterface.gen {
422 :			tgt = tgt,
423 :			inputs = [], (* FIXME *)
424 :			outputs = [output]
425 :	jhr	1713	};
426 :			(* *)
427 :	jhr	1716	outputLibSrc (basename, prog);
428 :	jhr	1714	(* compile and link *)
429 :			compile (tgt, basename);
430 :			RunCC.linkLib (basename, ldFlags tgt)
431 :	jhr	1706	end
432 :
433 :			fun generate (prog as Prog{tgt, ...}) = if #exec tgt
434 :			then generateExec prog
435 :			else generateLib prog
436 :
437 :	jhr	1115	end
438 :
439 :			(* strands *)
440 :			structure Strand =
441 :			struct
442 :	jhr	1640	fun define (Prog{strands, ...}, strandId, state) = let
443 :	jhr	1375	val name = Atom.toString strandId
444 :	jhr	1640	(* the output state variable *)
445 :			val outputVar = (case List.filter IL.StateVar.isOutput state
446 :			of [] => raise Fail("no output specified for strand " ^ name)
447 :			| [x] => (IL.StateVar.ty x, IL.StateVar.name x)
448 :			| _ => raise Fail("multiple outputs in " ^ name)
449 :			(* end case *))
450 :			(* the state variables *)
451 :			val state = let
452 :			fun cvt x = CL.V(ToC.trType(IL.StateVar.ty x), IL.StateVar.name x)
453 :			in
454 :			List.map cvt state
455 :			end
456 :	jhr	1375	val strand = Strand{
457 :			name = name,
458 :	jhr	1376	tyName = N.strandTy name,
459 :	jhr	1640	state = state,
460 :			output = outputVar,
461 :	jhr	1375	code = ref []
462 :			}
463 :			in
464 :			AtomTable.insert strands (strandId, strand);
465 :			strand
466 :			end
467 :	jhr	1115
468 :			(* return the strand with the given name *)
469 :	jhr	1375	fun lookup (Prog{strands, ...}, strandId) = AtomTable.lookup strands strandId
470 :	jhr	1115
471 :			(* register the strand-state initialization code. The variables are the strand
472 :			* parameters.
473 :			*)
474 :	jhr	1375	fun init (Strand{name, tyName, code, ...}, params, init) = let
475 :	jhr	1376	val fName = N.strandInit name
476 :	jhr	1375	val params =
477 :			CL.PARAM([], CL.T_Ptr(CL.T_Named tyName), "selfOut") ::
478 :	jhr	1640	List.map (fn (CL.V(ty, x)) => CL.PARAM([], ty, x)) params
479 :	jhr	1375	val initFn = CL.D_Func([], CL.voidTy, fName, params, init)
480 :			in
481 :			code := initFn :: !code
482 :			end
483 :	jhr	1115
484 :			(* register a strand method *)
485 :	jhr	1375	fun method (Strand{name, tyName, code, ...}, methName, body) = let
486 :	jhr	1640	val fName = concat[name, "_", StrandUtil.nameToString methName]
487 :	jhr	1375	val params = [
488 :			CL.PARAM([], CL.T_Ptr(CL.T_Named tyName), "selfIn"),
489 :			CL.PARAM([], CL.T_Ptr(CL.T_Named tyName), "selfOut")
490 :			]
491 :	jhr	1444	val resTy = (case methName
492 :	jhr	1640	of StrandUtil.Update => CL.T_Named "StrandStatus_t"
493 :			| StrandUtil.Stabilize => CL.voidTy
494 :	jhr	1444	(* end case *))
495 :			val methFn = CL.D_Func(["static"], resTy, fName, params, body)
496 :	jhr	1375	in
497 :			code := methFn :: !code
498 :			end
499 :	jhr	1115
500 :			end
501 :
502 :			end
503 :
504 :			structure CBackEnd = CodeGenFn(CTarget)

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