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source: src/main.cpp @ c82dad4

Last change on this file since c82dad4 was f660b10, checked in by Andrew Beach <ajbeach@…>, 7 weeks ago
Moved the backtrace/signal code to the bottom of the main file (so people don't have to scroll past it.
Property mode set to `100644`
File size: 28.3 KB

Line
1	//
2	// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
3	//
4	// The contents of this file are covered under the licence agreement in the
5	// file "LICENCE" distributed with Cforall.
6	//
7	// main.cpp --
8	//
9	// Author : Peter Buhr and Rob Schluntz
10	// Created On : Fri May 15 23:12:02 2015
11	// Last Modified By : Peter A. Buhr
12	// Last Modified On : Sun Jun 23 16:38:09 2024
13	// Update Count : 691
14	//
15
16	#include <cxxabi.h> // for __cxa_demangle
17	#include <execinfo.h> // for backtrace, backtrace_symbols
18	#include <getopt.h> // for no_argument, optind, geto...
19	#include <cassert> // for assertf
20	#include <cstdio> // for fopen, FILE, fclose, stdin
21	#include <cstdlib> // for exit, free, abort, EXIT_F...
22	#include <csignal> // for signal, SIGABRT, SIGSEGV
23	#include <cstring> // for index
24	#include <fstream> // for ofstream
25	#include <iostream> // for operator<<, basic_ostream
26	#include <iomanip>
27	#include <iterator> // for back_inserter
28	#include <list> // for list
29	#include <string> // for char_traits, operator<<
30
31	#include "AST/Pass.hpp" // for pass_visitor_stats
32	#include "AST/Print.hpp" // for printAll
33	#include "AST/TranslationUnit.hpp" // for TranslationUnit
34	#include "AST/Util.hpp" // for checkInvariants
35	#include "CompilationState.hpp"
36	#include "../config.h" // for CFA_LIBDIR
37	#include "CodeGen/FixMain.hpp" // for FixMain
38	#include "CodeGen/FixNames.hpp" // for fixNames
39	#include "CodeGen/Generate.hpp" // for generate
40	#include "CodeGen/LinkOnce.hpp" // for translateLinkOnce
41	#include "Common/CodeLocationTools.hpp" // for forceFillCodeLocations
42	#include "Common/DeclStats.hpp" // for printDeclStats
43	#include "Common/ResolvProtoDump.hpp" // for dumpAsResolverProto
44	#include "Common/Stats.hpp" // for Stats
45	#include "Common/Utility.hpp" // for deleteAll, filter, printAll
46	#include "Concurrency/Actors.hpp" // for implementActors
47	#include "Concurrency/Corun.hpp" // for implementCorun
48	#include "Concurrency/Keywords.hpp" // for implementMutex, implement...
49	#include "Concurrency/Waitfor.hpp" // for generateWaitfor
50	#include "Concurrency/Waituntil.hpp" // for generateWaitUntil
51	#include "ControlStruct/ExceptDecl.hpp" // for translateExcept
52	#include "ControlStruct/ExceptTranslate.hpp"// for translateThrows, translat...
53	#include "ControlStruct/FixLabels.hpp" // for fixLabels
54	#include "ControlStruct/HoistControlDecls.hpp" // hoistControlDecls
55	#include "ControlStruct/TranslateEnumRange.hpp" // translateEnumRange
56	#include "GenPoly/Box.hpp" // for box
57	#include "GenPoly/InstantiateGeneric.hpp" // for instantiateGeneric
58	#include "GenPoly/Lvalue.hpp" // for convertLvalue
59	#include "GenPoly/Specialize.hpp" // for convertSpecializations
60	#include "InitTweak/FixInit.hpp" // for fix
61	#include "InitTweak/GenInit.hpp" // for genInit
62	#include "MakeLibCfa.hpp" // for makeLibCfa
63	#include "Parser/RunParser.hpp" // for buildList, dumpParseTree,...
64	#include "ResolvExpr/CandidatePrinter.hpp" // for printCandidates
65	#include "ResolvExpr/EraseWith.hpp" // for eraseWith
66	#include "ResolvExpr/Resolver.hpp" // for resolve
67	#include "Tuples/Tuples.hpp" // for expandMemberTuples, expan...
68	#include "Validate/Autogen.hpp" // for autogenerateRoutines
69	#include "Validate/CheckAssertions.hpp" // for checkAssertions
70	#include "Validate/CompoundLiteral.hpp" // for handleCompoundLiterals
71	#include "Validate/EliminateTypedef.hpp" // for eliminateTypedef
72	#include "Validate/EnumAndPointerDecay.hpp" // for decayEnumsAndPointers
73	#include "Validate/FindSpecialDecls.hpp" // for findGlobalDecls
74	#include "Validate/FixQualifiedTypes.hpp" // for fixQualifiedTypes
75	#include "Validate/FixReturnTypes.hpp" // for fixReturnTypes
76	#include "Validate/ForallPointerDecay.hpp" // for decayForallPointers
77	#include "Validate/GenericParameter.hpp" // for fillGenericParameters, tr...
78	#include "Validate/HoistStruct.hpp" // for hoistStruct
79	#include "Validate/HoistTypeDecls.hpp" // for hoistTypeDecls
80	#include "Validate/ImplementEnumFunc.hpp" // for implementEnumFunc
81	#include "Validate/InitializerLength.hpp" // for setLengthFromInitializer
82	#include "Validate/LabelAddressFixer.hpp" // for fixLabelAddresses
83	#include "Validate/LinkInstanceTypes.hpp" // for linkInstanceTypes
84	#include "Validate/ReplaceTypedef.hpp" // for replaceTypedef
85	#include "Validate/ReturnCheck.hpp" // for checkReturnStatements
86	#include "Validate/VerifyCtorDtorAssign.hpp" // for verifyCtorDtorAssign
87	#include "Virtual/ExpandCasts.hpp" // for expandCasts
88	#include "Virtual/VirtualDtor.hpp" // for implementVirtDtors
89
90	using namespace std;
91
92	static void NewPass( const char * const name ) {
93	Stats::Heap::newPass( name );
94	using namespace Stats::Counters;
95	{
96	static auto group = build<CounterGroup>( "Pass Visitor Template" );
97	auto pass = build<CounterGroup>( name, group );
98	ast::pass_visitor_stats.depth = 0;
99	ast::pass_visitor_stats.avg = build<AverageCounter<double>>( "Average Depth", pass );
100	ast::pass_visitor_stats.max = build<MaxCounter<double>>( "Max Depth", pass );
101	}
102	}
103
104	#define PASS( name, pass, unit, ... ) \
105	if ( errorp ) { cerr << name << endl; } \
106	NewPass(name); \
107	Stats::Time::StartBlock(name); \
108	pass(unit,##__VA_ARGS__); \
109	Stats::Time::StopBlock(); \
110	if ( invariant ) { \
111	ast::checkInvariants(unit); \
112	}
113
114	#define DUMP( cond, unit ) \
115	if ( cond ) { \
116	dump( std::move( unit ) ); \
117	return EXIT_SUCCESS; \
118	}
119
120	static bool waiting_for_gdb = false; // flag to set cfa-cpp to wait for gdb on start
121
122	static string PreludeDirector = "";
123
124	static void parse_cmdline( int argc, char * argv[] );
125	static void dump( ast::TranslationUnit && transUnit, ostream & out = cout );
126
127	static void backtrace( int start );
128	static void initSignals();
129
130	int main( int argc, char * argv[] ) {
131	FILE * input; // use FILE rather than istream because yyin is FILE
132	ostream * output = & cout;
133	ast::TranslationUnit transUnit;
134
135	initSignals();
136
137	// cout << "main" << endl;
138	// for ( int i = 0; i < argc; i += 1 ) {
139	// cout << '\t' << argv[i] << endl;
140	// } // for
141
142	parse_cmdline( argc, argv ); // process command-line arguments
143
144	if ( waiting_for_gdb ) {
145	cerr << "Waiting for gdb" << endl;
146	cerr << "run :" << endl;
147	cerr << " gdb attach " << getpid() << endl;
148	raise(SIGSTOP);
149	} // if
150
151	try {
152	// choose to read the program from a file or stdin
153	if ( optind < argc ) { // any commands after the flags ? => input file name
154	input = fopen( argv[ optind ], "r" );
155	assertf( input, "cannot open %s because %s\n", argv[ optind ], strerror( errno ) );
156	optind += 1;
157	} else { // no input file name
158	input = stdin;
159	} // if
160
161	Stats::Time::StartGlobal();
162	NewPass("Parse");
163	Stats::Time::StartBlock("Parse");
164
165	// read in the builtins, extras, and the prelude
166	if ( ! nopreludep ) { // include gcc builtins
167	// -l is for initial build ONLY and builtins.cf is not in the lib directory so access it here.
168
169	assertf( !PreludeDirector.empty(), "Can't find prelude without option --prelude-dir must be used." );
170
171	// Read to gcc builtins, if not generating the cfa library
172	FILE * gcc_builtins = fopen( (PreludeDirector + "/gcc-builtins.cfa").c_str(), "r" );
173	assertf( gcc_builtins, "cannot open gcc-builtins.cfa\n" );
174	parse( gcc_builtins, ast::Linkage::Compiler );
175
176	// read the extra prelude in, if not generating the cfa library
177	FILE * extras = fopen( (PreludeDirector + "/extras.cfa").c_str(), "r" );
178	assertf( extras, "cannot open extras.cfa\n" );
179	parse( extras, ast::Linkage::BuiltinC );
180	if ( ! libcfap ) {
181	// read the prelude in, if not generating the cfa library
182	FILE * prelude = fopen( (PreludeDirector + "/prelude.cfa").c_str(), "r" );
183	assertf( prelude, "cannot open prelude.cfa\n" );
184	parse( prelude, ast::Linkage::Intrinsic );
185
186	// Read to cfa builtins, if not generating the cfa library
187	FILE * builtins = fopen( (PreludeDirector + "/builtins.cfa").c_str(), "r" );
188	assertf( builtins, "cannot open builtins.cfa\n" );
189	parse( builtins, ast::Linkage::BuiltinCFA );
190	} // if
191	} // if
192
193	parse( input, libcfap ? ast::Linkage::Intrinsic : ast::Linkage::Cforall, yydebug );
194
195	transUnit = buildUnit();
196
197	DUMP( astp, transUnit );
198
199	Stats::Time::StopBlock();
200
201	PASS( "Hoist Type Decls", Validate::hoistTypeDecls, transUnit );
202
203	PASS( "Translate Exception Declarations", ControlStruct::translateExcept, transUnit );
204	DUMP( exdeclp, transUnit );
205	PASS( "Verify Ctor, Dtor & Assign", Validate::verifyCtorDtorAssign, transUnit );
206	PASS( "Replace Typedefs", Validate::replaceTypedef, transUnit );
207	PASS( "Fix Return Types", Validate::fixReturnTypes, transUnit );
208	PASS( "Check Assertions", Validate::checkAssertions, transUnit );
209	PASS( "Enum and Pointer Decay", Validate::decayEnumsAndPointers, transUnit );
210
211	PASS( "Link Instance Types", Validate::linkInstanceTypes, transUnit );
212
213	PASS( "Forall Pointer Decay", Validate::decayForallPointers, transUnit );
214	PASS( "Fix Qualified Types", Validate::fixQualifiedTypes, transUnit );
215	PASS( "Eliminate Typedef", Validate::eliminateTypedef, transUnit );
216	PASS( "Hoist Struct", Validate::hoistStruct, transUnit );
217	PASS( "Validate Generic Parameters", Validate::fillGenericParameters, transUnit );
218	PASS( "Translate Enum Range Expression", ControlStruct::translateEnumRange, transUnit );
219	PASS( "Translate Dimensions", Validate::translateDimensionParameters, transUnit );
220	PASS( "Generate Enum Attributes Functions", Validate::implementEnumFunc, transUnit );
221	PASS( "Check Function Returns", Validate::checkReturnStatements, transUnit );
222	PASS( "Fix Return Statements", InitTweak::fixReturnStatements, transUnit );
223	PASS( "Implement Concurrent Keywords", Concurrency::implementKeywords, transUnit );
224	PASS( "Fix Unique Ids", Validate::fixUniqueIds, transUnit );
225	PASS( "Implement Corun", Concurrency::implementCorun, transUnit );
226	PASS( "Fix Label Address", Validate::fixLabelAddresses, transUnit );
227	PASS( "Fix Labels", ControlStruct::fixLabels, transUnit );
228	PASS( "Hoist Control Declarations", ControlStruct::hoistControlDecls, transUnit );
229
230	PASS( "Generate Autogen Routines", Validate::autogenerateRoutines, transUnit );
231
232	PASS( "Implement Actors", Concurrency::implementActors, transUnit );
233	PASS( "Implement Virtual Destructors", Virtual::implementVirtDtors, transUnit );
234	PASS( "Implement Mutex", Concurrency::implementMutex, transUnit );
235	PASS( "Implement Thread Start", Concurrency::implementThreadStarter, transUnit );
236	PASS( "Compound Literal", Validate::handleCompoundLiterals, transUnit );
237	PASS( "Set Length From Initializer", Validate::setLengthFromInitializer, transUnit );
238	PASS( "Find Global Decls", Validate::findGlobalDecls, transUnit );
239
240	if ( symtabp ) {
241	return EXIT_SUCCESS;
242	} // if
243
244	if ( expraltp ) {
245	ResolvExpr::printCandidates( transUnit );
246	return EXIT_SUCCESS;
247	} // if
248
249	DUMP( validp, transUnit );
250
251	PASS( "Translate Throws", ControlStruct::translateThrows, transUnit );
252	PASS( "Implement Waituntil", Concurrency::generateWaitUntil, transUnit );
253	PASS( "Fix Names", CodeGen::fixNames, transUnit );
254	PASS( "Gen Init", InitTweak::genInit, transUnit );
255	PASS( "Expand Member Tuples" , Tuples::expandMemberTuples, transUnit );
256
257	if ( libcfap ) {
258	// Generate the bodies of cfa library functions.
259	LibCfa::makeLibCfa( transUnit );
260	} // if
261
262	if ( declstatsp ) {
263	printDeclStats( transUnit );
264	return EXIT_SUCCESS;
265	} // if
266
267	DUMP( bresolvep, transUnit );
268
269	if ( resolvprotop ) {
270	dumpAsResolverProto( transUnit );
271	return EXIT_SUCCESS;
272	} // if
273
274	PASS( "Resolve", ResolvExpr::resolve, transUnit );
275	DUMP( exprp, transUnit );
276	PASS( "Fix Init", InitTweak::fix, transUnit, buildingLibrary() ); // Here
277	PASS( "Erase With", ResolvExpr::eraseWith, transUnit );
278
279	// fix ObjectDecl - replaces ConstructorInit nodes
280	DUMP( ctorinitp, transUnit );
281
282	// Currently not working due to unresolved issues with UniqueExpr
283	PASS( "Expand Unique Expr", Tuples::expandUniqueExpr, transUnit ); // xxx - is this the right place for this? want to expand ASAP so tha, sequent passes don't need to worry about double-visiting a unique expr - needs to go after InitTweak::fix so that copy constructed return declarations are reused
284
285	PASS( "Translate Tries", ControlStruct::translateTries, transUnit );
286	PASS( "Gen Waitfor", Concurrency::generateWaitFor, transUnit );
287	PASS( "Fix Main Linkage", CodeGen::fixMainLinkage, transUnit, !nomainp );
288
289	// Needs to happen before tuple types are expanded.
290	PASS( "Convert Specializations", GenPoly::convertSpecializations, transUnit );
291
292	PASS( "Expand Tuples", Tuples::expandTuples, transUnit );
293	DUMP( tuplep, transUnit );
294
295	// Must come after Translate Tries.
296	PASS( "Virtual Expand Casts", Virtual::expandCasts, transUnit );
297
298	PASS( "Instantiate Generics", GenPoly::instantiateGeneric, transUnit );
299	DUMP( genericsp, transUnit );
300
301	PASS( "Convert L-Value", GenPoly::convertLvalue, transUnit );
302	DUMP( bboxp, transUnit );
303	PASS( "Box", GenPoly::box, transUnit );
304	PASS( "Link-Once", CodeGen::translateLinkOnce, transUnit );
305
306	// Code has been lowered to C, now we can start generation.
307
308	DUMP( bcodegenp, transUnit );
309
310	if ( optind < argc ) { // any commands after the flags and input file ? => output file name
311	output = new ofstream( argv[ optind ] );
312	} // if
313
314	PASS( "Code Gen", CodeGen::generate, transUnit, *output, !genproto, prettycodegenp, true, linemarks, false );
315	CodeGen::fixMainInvoke( transUnit, *output, (PreludeDirector + "/bootloader.c").c_str() );
316
317	if ( output != &cout ) {
318	delete output;
319	} // if
320	} catch ( SemanticErrorException & e ) {
321	if ( errorp ) {
322	cerr << "---AST at error:---" << endl;
323	dump( std::move( transUnit ), cerr );
324	cerr << endl << "---End of AST, begin error message:---\n" << endl;
325	} // if
326	e.print();
327	if ( output != &cout ) {
328	delete output;
329	} // if
330	return EXIT_FAILURE;
331	} catch ( std::bad_alloc & ) {
332	cerr << "cfa-cpp compilation error std::bad_alloc" << endl;
333	backtrace( 1 );
334	abort();
335	} catch ( ... ) {
336	exception_ptr eptr = current_exception();
337	try {
338	if (eptr) {
339	rethrow_exception(eptr);
340	} else {
341	cerr << "cfa-cpp compilation error exception uncaught and unknown" << endl;
342	} // if
343	} catch( const exception & e ) {
344	cerr << "cfa-cpp compilation error uncaught exception \"" << e.what() << "\"\n";
345	} // try
346	return EXIT_FAILURE;
347	} // try
348
349	// This pseudo-pass is used to get more accurate heap statistics.
350	NewPass("Clean-up");
351	Stats::Time::StartBlock("Clean-Up");
352	transUnit.global = ast::TranslationGlobal();
353	transUnit.decls.clear();
354	Stats::Time::StopBlock();
355
356	Stats::print();
357	return EXIT_SUCCESS;
358	} // main
359
360
361	static const char optstring[] = ":c:ghilLmNnpdP:S:twW:D:";
362
363	enum { PreludeDir = 128 };
364	static struct option long_opts[] = {
365	{ "colors", required_argument, nullptr, 'c' },
366	{ "gdb", no_argument, nullptr, 'g' },
367	{ "help", no_argument, nullptr, 'h' },
368	{ "invariant", no_argument, nullptr, 'i' },
369	{ "libcfa", no_argument, nullptr, 'l' },
370	{ "linemarks", no_argument, nullptr, 'L' },
371	{ "no-main", no_argument, nullptr, 'm' },
372	{ "no-linemarks", no_argument, nullptr, 'N' },
373	{ "no-prelude", no_argument, nullptr, 'n' },
374	{ "prototypes", no_argument, nullptr, 'p' },
375	{ "deterministic-out", no_argument, nullptr, 'd' },
376	{ "print", required_argument, nullptr, 'P' },
377	{ "prelude-dir", required_argument, nullptr, PreludeDir },
378	{ "statistics", required_argument, nullptr, 'S' },
379	{ "tree", no_argument, nullptr, 't' },
380	{ "", no_argument, nullptr, 0 }, // -w
381	{ "", no_argument, nullptr, 0 }, // -W
382	{ "", no_argument, nullptr, 0 }, // -D
383	{ nullptr, 0, nullptr, 0 }
384	}; // long_opts
385
386	static const char * description[] = {
387	"diagnostic color: never, always, auto", // -c
388	"wait for gdb to attach", // -g
389	"print translator help message", // -h
390	"invariant checking during AST passes", // -i
391	"generate libcfa.c", // -l
392	"generate line marks", // -L
393	"do not replace main", // -m
394	"do not generate line marks", // -N
395	"do not read prelude", // -n
396	"do not generate prelude prototypes => prelude not printed", // -p
397	"only print deterministic output", // -d
398	"print", // -P
399	"<directory> prelude directory for debug/nodebug", // no flag
400	"<option-list> enable profiling information: counters, heap, time, all, none", // -S
401	"building cfa standard lib", // -t
402	"", // -w
403	"", // -W
404	"", // -D
405	}; // description
406
407	static_assert( sizeof( long_opts ) / sizeof( long_opts[0] ) - 1 == sizeof( description ) / sizeof( description[0] ), "Long opts and description must match" );
408
409	static struct Printopts {
410	const char * name;
411	int & flag;
412	int val;
413	const char * descript;
414	} printopts[] = {
415	{ "ascodegen", codegenp, true, "print AST as codegen rather than AST" },
416	{ "asterr", errorp, true, "print AST on error" },
417	{ "declstats", declstatsp, true, "print code property statistics" },
418	{ "parse", yydebug, true, "print yacc (parsing) debug information" },
419	{ "pretty", prettycodegenp, true, "prettyprint for ascodegen flag" },
420	{ "rproto", resolvprotop, true, "resolver-proto instance" },
421	{ "rsteps", resolvep, true, "print resolver steps" },
422	// AST dumps
423	{ "ast", astp, true, "print AST after parsing" },
424	{ "excpdecl", exdeclp, true, "print AST after translating exception decls" },
425	{ "symevt", symtabp, true, "print AST after symbol table events" },
426	{ "expralt", expraltp, true, "print AST after expressions alternatives" },
427	{ "valdecl", validp, true, "print AST after declaration validation pass" },
428	{ "bresolver", bresolvep, true, "print AST before resolver step" },
429	{ "expranly", exprp, true, "print AST after expression analysis" },
430	{ "ctordtor", ctorinitp, true, "print AST after ctor/dtor are replaced" },
431	{ "tuple", tuplep, true, "print AST after tuple expansion" },
432	{ "instgen", genericsp, true, "print AST after instantiate generics" },
433	{ "bbox", bboxp, true, "print AST before box pass" },
434	{ "bcodegen", bcodegenp, true, "print AST before code generation" }
435	};
436	enum { printoptsSize = sizeof( printopts ) / sizeof( printopts[0] ) };
437
438	static void usage( char * argv[] ) {
439	cout << "Usage: " << argv[0] << " [options] [input-file (default stdin)] [output-file (default stdout)], where options are:" << endl;
440	int i = 0, j = 1; // j skips starting colon
441	for ( ; long_opts[i].name != 0 && optstring[j] != '\0'; i += 1, j += 1 ) {
442	if ( long_opts[i].name[0] != '\0' ) { // hidden option, internal usage only
443	if ( strcmp( long_opts[i].name, "prelude-dir" ) != 0 ) { // flag
444	cout << " -" << optstring[j] << ",";
445	} else { // no flag
446	j -= 1; // compensate
447	cout << " ";
448	} // if
449	cout << " --" << left << setw(12) << long_opts[i].name << " ";
450	if ( strcmp( long_opts[i].name, "print" ) == 0 ) {
451	cout << "one of: " << endl;
452	for ( int i = 0; i < printoptsSize; i += 1 ) {
453	cout << setw(10) << " " << left << setw(10) << printopts[i].name << " " << printopts[i].descript << endl;
454	} // for
455	} else {
456	cout << description[i] << endl;
457	} // if
458	} // if
459	if ( optstring[j + 1] == ':' ) j += 1;
460	} // for
461	if ( long_opts[i].name != 0 \|\| optstring[j] != '\0' ) assertf( false, "internal error, mismatch of option flags and names\n" );
462	exit( EXIT_FAILURE );
463	} // usage
464
465	static void parse_cmdline( int argc, char * argv[] ) {
466	opterr = 0; // (global) prevent getopt from printing error messages
467
468	bool Wsuppress = false, Werror = false;
469	int c;
470	while ( (c = getopt_long( argc, argv, optstring, long_opts, nullptr )) != -1 ) {
471	switch ( c ) {
472	case 'c': // diagnostic colors
473	if ( strcmp( optarg, "always" ) == 0 ) {
474	ErrorHelpers::colors = ErrorHelpers::Colors::Always;
475	} else if ( strcmp( optarg, "never" ) == 0 ) {
476	ErrorHelpers::colors = ErrorHelpers::Colors::Never;
477	} else if ( strcmp( optarg, "auto" ) == 0 ) {
478	ErrorHelpers::colors = ErrorHelpers::Colors::Auto;
479	} // if
480	break;
481	case 'h': // help message
482	usage( argv ); // no return
483	break;
484	case 'i': // invariant checking
485	invariant = true;
486	break;
487	case 'l': // generate libcfa.c
488	libcfap = true;
489	break;
490	case 'L': // generate line marks
491	linemarks = true;
492	break;
493	case 'm': // do not replace main
494	nomainp = true;
495	break;
496	case 'N': // do not generate line marks
497	linemarks = false;
498	break;
499	case 'n': // do not read prelude
500	nopreludep = true;
501	break;
502	case 'p': // generate prototypes for prelude functions
503	genproto = true;
504	break;
505	case 'd': // don't print non-deterministic output
506	deterministic_output = true;
507	break;
508	case 'P': // print options
509	for ( int i = 0;; i += 1 ) {
510	if ( i == printoptsSize ) {
511	cout << "Unknown --print option " << optarg << endl;
512	goto Default;
513	} // if
514	if ( strcmp( optarg, printopts[i].name ) == 0 ) {
515	printopts[i].flag = printopts[i].val;
516	break;
517	} // if
518	} // for
519	break;
520	case PreludeDir: // prelude directory for debug/nodebug, hidden
521	PreludeDirector = optarg;
522	break;
523	case 'S': // enable profiling information, argument comma separated list of names
524	Stats::parse_params( optarg );
525	break;
526	case 't': // building cfa stdlib
527	treep = true;
528	break;
529	case 'g': // wait for gdb
530	waiting_for_gdb = true;
531	break;
532	case 'w': // suppress all warnings, hidden
533	Wsuppress = true;
534	break;
535	case 'W': // coordinate gcc -W with CFA, hidden
536	if ( strcmp( optarg, "all" ) == 0 ) {
537	SemanticWarning_EnableAll();
538	} else if ( strcmp( optarg, "error" ) == 0 ) {
539	Werror = true;
540	} else {
541	char * warning = optarg;
542	Severity s;
543	if ( strncmp( optarg, "no-", 3 ) == 0 ) {
544	warning += 3;
545	s = Severity::Suppress;
546	} else {
547	s = Severity::Warn;
548	} // if
549	SemanticWarning_Set( warning, s );
550	} // if
551	break;
552	case 'D': // ignore -Dxxx, forwarded by cpp, hidden
553	break;
554	case '?': // unknown option
555	if ( optopt ) { // short option ?
556	cout << "Unknown option -" << (char)optopt << endl;
557	} else {
558	cout << "Unknown option " << argv[optind - 1] << endl;
559	} // if
560	goto Default;
561	case ':': // missing option
562	if ( optopt ) { // short option ?
563	cout << "Missing option for -" << (char)optopt << endl;
564	} else {
565	cout << "Missing option for " << argv[optind - 1] << endl;
566	} // if
567	goto Default;
568	Default:
569	default:
570	usage( argv ); // no return
571	} // switch
572	} // while
573
574	if ( Werror ) {
575	SemanticWarning_WarningAsError();
576	} // if
577	if ( Wsuppress ) {
578	SemanticWarning_SuppressAll();
579	} // if
580	// for ( const auto w : WarningFormats ) {
581	// cout << w.name << ' ' << (int)w.severity << endl;
582	// } // for
583	} // parse_cmdline
584
585	static bool notPrelude( ast::ptr<ast::Decl> & decl ) {
586	return !decl->linkage.is_builtin;
587	}
588
589	static void dump( ast::TranslationUnit && unit, std::ostream & out ) {
590	// May filter out all prelude declarations.
591	if ( genproto ) {
592	std::list<ast::ptr<ast::Decl>> decls;
593	std::copy_if( unit.decls.begin(), unit.decls.end(),
594	std::back_inserter( decls ), notPrelude );
595	decls.swap( unit.decls );
596	}
597
598	// May print as full dump or as code generation.
599	if ( codegenp ) {
600	CodeGen::generate( unit, out, !genproto, prettycodegenp, false, false, false );
601	} else {
602	ast::printAll( out, unit.decls );
603	}
604	}
605
606	static void backtrace( int start ) { // skip first N stack frames
607	enum { Frames = 50, }; // maximum number of stack frames
608	void * array[Frames];
609	size_t size = ::backtrace( array, Frames );
610	char ** messages = ::backtrace_symbols( array, size ); // does not demangle names
611
612	*index( messages[0], '(' ) = '\0'; // find executable name
613	cerr << "Stack back trace for: " << messages[0] << endl;
614
615	// skip last 2 stack frames after main
616	for ( unsigned int i = start; i < size - 2 && messages != nullptr; i += 1 ) {
617	char * mangled_name = nullptr, * offset_begin = nullptr, * offset_end = nullptr;
618
619	for ( char * p = messages[i]; *p; p += 1 ) { // find parantheses and +offset
620	if ( *p == '(' ) {
621	mangled_name = p;
622	} else if ( *p == '+' ) {
623	offset_begin = p;
624	} else if ( *p == ')' ) {
625	offset_end = p;
626	break;
627	} // if
628	} // for
629
630	// if line contains symbol, attempt to demangle
631	int frameNo = i - start;
632	if ( mangled_name && offset_begin && offset_end && mangled_name < offset_begin ) {
633	*mangled_name++ = '\0'; // delimit strings
634	*offset_begin++ = '\0';
635	*offset_end++ = '\0';
636
637	int status;
638	char * real_name = __cxxabiv1::__cxa_demangle( mangled_name, 0, 0, &status );
639	// bug in __cxa_demangle for single-character lower-case non-mangled names
640	if ( status == 0 ) { // demangling successful ?
641	cerr << "(" << frameNo << ") " << messages[i] << " : "
642	<< real_name << "+" << offset_begin << offset_end << endl;
643	} else { // otherwise, output mangled name
644	cerr << "(" << frameNo << ") " << messages[i] << " : "
645	<< mangled_name << "(/unknown/)+" << offset_begin << offset_end << endl;
646	} // if
647
648	free( real_name );
649	} else { // otherwise, print the whole line
650	cerr << "(" << frameNo << ") " << messages[i] << endl;
651	} // if
652	} // for
653
654	free( messages );
655	} // backtrace
656
657	#define SIGPARMS int sig __attribute__(( unused )), siginfo_t * sfp __attribute__(( unused )), ucontext_t * cxt __attribute__(( unused ))
658
659	static void _Signal(struct sigaction & act, int sig, int flags ) {
660	sigemptyset( &act.sa_mask );
661	act.sa_flags = flags;
662
663	if ( sigaction( sig, &act, nullptr ) == -1 ) {
664	cerr << "cfa-cpp compilation error problem installing signal handler, error(" << errno << ") " << strerror( errno ) << endl;
665	_exit( EXIT_FAILURE );
666	} // if
667	}
668
669	static void Signal( int sig, void (* handler)(SIGPARMS), int flags ) {
670	struct sigaction act;
671	act.sa_sigaction = (void ()(int, siginfo_t , void *))handler;
672	_Signal(act, sig, flags);
673	} // Signal
674
675	static void Signal( int sig, void (* handler)(int), int flags ) {
676	struct sigaction act;
677	act.sa_handler = handler;
678	_Signal(act, sig, flags);
679	} // Signal
680
681	static void sigSegvBusHandler( SIGPARMS ) {
682	if ( sfp->si_addr == nullptr ) {
683	cerr << "Null pointer (nullptr) dereference." << endl;
684	} else {
685	cerr << (sig == SIGSEGV ? "Segment fault" : "Bus error") << " at memory location " << sfp->si_addr << "." << endl
686	<< "Possible cause is reading outside the address space or writing to a protected area within the address space with an invalid pointer or subscript." << endl;
687	} // if
688	backtrace( 2 ); // skip first 2 stack frames
689	abort(); // cause core dump for debugging
690	} // sigSegvBusHandler
691
692	static void sigFpeHandler( SIGPARMS ) {
693	const char * msg;
694
695	switch ( sfp->si_code ) {
696	case FPE_INTDIV: case FPE_FLTDIV: msg = "divide by zero"; break;
697	case FPE_FLTOVF: msg = "overflow"; break;
698	case FPE_FLTUND: msg = "underflow"; break;
699	case FPE_FLTRES: msg = "inexact result"; break;
700	case FPE_FLTINV: msg = "invalid operation"; break;
701	default: msg = "unknown";
702	} // choose
703	cerr << "Computation error " << msg << " at location " << sfp->si_addr << endl
704	<< "Possible cause is constant-expression evaluation invalid." << endl;
705	backtrace( 2 ); // skip first 2 stack frames
706	abort(); // cause core dump for debugging
707	} // sigFpeHandler
708
709	static void sigAbortHandler( SIGPARMS ) {
710	backtrace( 6 ); // skip first 6 stack frames
711	Signal( SIGABRT, SIG_DFL, SA_SIGINFO ); // reset default signal handler
712	raise( SIGABRT ); // reraise SIGABRT
713	} // sigAbortHandler
714
715	static void initSignals() {
716	Signal( SIGSEGV, sigSegvBusHandler, SA_SIGINFO );
717	Signal( SIGBUS, sigSegvBusHandler, SA_SIGINFO );
718	Signal( SIGFPE, sigFpeHandler, SA_SIGINFO );
719	Signal( SIGABRT, sigAbortHandler, SA_SIGINFO );
720	}
721
722	// Local Variables: //
723	// tab-width: 4 //
724	// mode: c++ //
725	// compile-command: "make install" //
726	// End: //

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