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source: driver/cc1.cc @ 4933f18

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Last change on this file since 4933f18 was d43a1fe, checked in by Peter A. Buhr <pabuhr@…>, 3 years ago
remove unused parameters from checkEnv1 to remove warnings
Property mode set to `100644`
File size: 18.4 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	// cc1.cc --
8	//
9	// Author : Peter A. Buhr
10	// Created On : Fri Aug 26 14:23:51 2005
11	// Last Modified By : Peter A. Buhr
12	// Last Modified On : Thu Feb 17 18:04:23 2022
13	// Update Count : 422
14	//
15
16	#include <iostream>
17	using std::cerr;
18	using std::endl;
19	#include <string>
20	using std::string;
21	#include <algorithm> // find
22	#include <cstdio> // stderr, stdout, perror, fprintf
23	#include <cstdlib> // getenv, exit, mkstemp
24	#include <unistd.h> // execvp, fork, unlink
25	#include <sys/wait.h> // wait
26	#include <fcntl.h> // creat
27
28
29	#include "config.h" // configure info
30
31
32	//#define __DEBUG_H__
33
34
35	static string compiler_path( CFA_BACKEND_CC ); // C compiler path/name
36	static bool CFA_flag = false; // -CFA flag
37	static bool save_temps = false; // -save-temps flag
38	static string o_file;
39	static string bprefix;
40	static string lang; // -x flag
41
42
43	static bool prefix( const string & arg, const string & pre ) {
44	return arg.substr( 0, pre.size() ) == pre;
45	} // prefix
46
47	static void suffix( const string & arg, const char * args[], int & nargs ) {
48	enum { NumSuffixes = 3 };
49	static const string suffixes[NumSuffixes] = { "cfa", "hfa", "ifa" };
50
51	size_t dot = arg.find_last_of( "." );
52	if ( dot == string::npos ) return;
53	const string * end = suffixes + NumSuffixes;
54	if ( std::find( suffixes, end, arg.substr( dot + 1 ) ) != end ) {
55	args[nargs++] = "-x";
56	args[nargs++] = "c";
57	} // if
58	} // suffix
59
60
61	static string __CFA_FLAGPREFIX__( "__CFA_FLAG" ); // "__CFA_FLAG__=" suffix
62
63	static void checkEnv1() { // stage 1
64	extern char ** environ;
65
66	for ( int i = 0; environ[i]; i += 1 ) {
67	string arg( environ[i] );
68	#ifdef __DEBUG_H__
69	cerr << "env arg:\"" << arg << "\"" << endl;
70	#endif // __DEBUG_H__
71
72	if ( prefix( arg, __CFA_FLAGPREFIX__ ) ) {
73	string val( arg.substr( arg.find_first_of( "=" ) + 1 ) );
74	if ( prefix( val, "-compiler=" ) ) {
75	compiler_path = val.substr( 10 );
76	} else if ( prefix( val, "-x=" ) ) {
77	lang = val.substr( 3 );
78	} // if
79	} // if
80	} // for
81	} // checkEnv1
82
83
84	static void checkEnv2( const char * args[], int & nargs ) { // stage 2
85	extern char ** environ;
86
87	for ( int i = 0; environ[i]; i += 1 ) {
88	string arg( environ[i] );
89	#ifdef __DEBUG_H__
90	cerr << "env arg:\"" << arg << "\"" << endl;
91	#endif // __DEBUG_H__
92
93	if ( prefix( arg, __CFA_FLAGPREFIX__ ) ) {
94	string val( arg.substr( arg.find_first_of( "=" ) + 1 ) );
95	if ( prefix( val, "-compiler=" ) ) {
96	compiler_path = val.substr( 10 );
97	} else if ( val == "-CFA" ) {
98	CFA_flag = true;
99	} else if ( val == "-save-temps" \|\| val == "--save-temps" ) {
100	save_temps = true;
101	} else if ( prefix( val, "-o=" ) ) { // output file for -CFA
102	o_file = val.substr( 3 );
103	} else if ( prefix( val, "-B=" ) ) { // location of cfa-cpp
104	bprefix = val.substr( 3 );
105	} else if ( prefix( val, "-x=" ) ) { // ignore
106	} else { // normal flag for cfa-cpp
107	args[nargs++] = ( *new string( arg.substr( arg.find_first_of( "=" ) + 1 ) ) ).c_str();
108	} // if
109	} // if
110	} // for
111	} // checkEnv2
112
113	#define CFA_SUFFIX ".ifa"
114
115	static char tmpname[] = P_tmpdir "/CFAXXXXXX" CFA_SUFFIX;
116	static int tmpfilefd = -1;
117	static bool startrm = false;
118
119	static void rmtmpfile() {
120	if ( tmpfilefd == -1 ) return; // RACE, file created ?
121
122	startrm = true; // RACE with C-c C-c
123	if ( unlink( tmpname ) == -1 ) { // remove tmpname
124	perror ( "CC1 Translator error: failed, unlink" );
125	exit( EXIT_FAILURE );
126	} // if
127	tmpfilefd = -1; // mark removed
128	} // rmtmpfile
129
130
131	static void sigTermHandler( int ) { // C-c C-c
132	if ( startrm ) return; // return and let rmtmpfile finish, and then program finishes
133
134	if ( tmpfilefd != -1 ) { // RACE, file created ?
135	rmtmpfile(); // remove tmpname
136	} // if
137	exit( EXIT_FAILURE ); // terminate
138	} // sigTermHandler
139
140
141	static void Stage1( const int argc, const char * const argv[] ) {
142	int code;
143	string arg;
144
145	const char * cpp_in = nullptr;
146	const char * cpp_out = nullptr;
147
148	bool cpp_flag = false;
149	bool o_flag = false;
150
151	const char * args[argc + 100]; // leave space for 100 additional cpp command line values
152	int nargs = 1; // number of arguments in args list; 0 => command name
153
154	#ifdef __DEBUG_H__
155	cerr << "Stage1" << endl;
156	#endif // __DEBUG_H__
157	checkEnv1(); // arguments passed via environment variables
158	#ifdef __DEBUG_H__
159	for ( int i = 1; i < argc; i += 1 ) {
160	cerr << "argv[" << i << "]:\"" << argv[i] << "\"" << endl;
161	} // for
162	#endif // __DEBUG_H__
163
164	// process all the arguments
165
166	for ( int i = 1; i < argc; i += 1 ) {
167	arg = argv[i];
168	if ( prefix( arg, "-" ) ) {
169	// strip g++ flags that are inappropriate or cause duplicates in subsequent passes
170
171	if ( arg == "-quiet" ) {
172	} else if ( arg == "-imultilib" \|\| arg == "-imultiarch" ) {
173	i += 1; // and argument
174	} else if ( prefix( arg, "-A" ) ) {
175	} else if ( prefix( arg, "-D__GNU" ) ) {
176	//********
177	// GCC 5.6.0 SEPARATED THE -D FROM THE ARGUMENT!
178	//********
179	} else if ( arg == "-D" && prefix( argv[i + 1], "__GNU" ) ) {
180	i += 1; // and argument
181
182	// strip flags controlling cpp step
183
184	} else if ( arg == "-D__CPP__" ) {
185	cpp_flag = true;
186	} else if ( arg == "-D" && string( argv[i + 1] ) == "__CPP__" ) {
187	i += 1; // and argument
188	cpp_flag = true;
189
190	// all other flags
191
192	} else if ( arg == "-o" ) {
193	i += 1;
194	o_flag = true;
195	cpp_out = argv[i];
196	} else {
197	args[nargs++] = argv[i]; // pass flag along
198	// CPP flags with an argument
199	if ( arg == "-D" \|\| arg == "-U" \|\| arg == "-I" \|\| arg == "-MF" \|\| arg == "-MT" \|\| arg == "-MQ" \|\|
200	arg == "-include" \|\| arg == "-imacros" \|\| arg == "-idirafter" \|\| arg == "-iprefix" \|\|
201	arg == "-iwithprefix" \|\| arg == "-iwithprefixbefore" \|\| arg == "-isystem" \|\| arg == "-isysroot" \|\|
202	arg == "-dumpbase-ext" \|\| arg == "-dumpbase"
203	) {
204	i += 1;
205	args[nargs++] = argv[i]; // pass argument along
206	#ifdef __DEBUG_H__
207	cerr << "argv[" << i << "]:\"" << argv[i] << "\"" << endl;
208	#endif // __DEBUG_H__
209	} else if ( arg == "-MD" \|\| arg == "-MMD" ) {
210	// gcc frontend generates the dependency file-name after the -MD/-MMD flag, but it is necessary to
211	// prefix that file name with -MF.
212	args[nargs++] = "-MF"; // insert before file
213	i += 1;
214	args[nargs++] = argv[i]; // pass argument along
215	#ifdef __DEBUG_H__
216	cerr << "argv[" << i << "]:\"" << argv[i] << "\"" << endl;
217	#endif // __DEBUG_H__
218	} // if
219	} // if
220	} else { // obtain input and possibly output files
221	if ( cpp_in == nullptr ) {
222	cpp_in = argv[i];
223	#ifdef __DEBUG_H__
224	cerr << "cpp_in:\"" << cpp_in << "\"" << endl;
225	#endif // __DEBUG_H__
226	} else if ( cpp_out == nullptr ) {
227	cpp_out = argv[i];
228	#ifdef __DEBUG_H__
229	cerr << "cpp_out:\"" << cpp_out << "\""<< endl;
230	#endif // __DEBUG_H__
231	} else {
232	cerr << "Usage: " << argv[0] << " input-file [output-file] [options]" << endl;
233	exit( EXIT_FAILURE );
234	} // if
235	} // if
236	} // for
237
238	#ifdef __DEBUG_H__
239	cerr << "args:";
240	for ( int i = 1; i < nargs; i += 1 ) {
241	cerr << " " << args[i];
242	} // for
243	if ( cpp_in != nullptr ) cerr << " " << cpp_in;
244	if ( cpp_out != nullptr ) cerr << " " << cpp_out;
245	cerr << endl;
246	#endif // __DEBUG_H__
247
248	if ( cpp_in == nullptr ) {
249	cerr << "Usage: " << argv[0] << " input-file [output-file] [options]" << endl;
250	exit( EXIT_FAILURE );
251	} // if
252
253	if ( cpp_flag ) {
254	// The -E flag is specified on the cfa command so only run the preprocessor and output is written to standard
255	// output or -o. The call to cfa has a -E so it does not have to be added to the argument list.
256
257	args[0] = compiler_path.c_str();
258	if ( lang.size() == 0 ) {
259	suffix( cpp_in, args, nargs ); // check suffix
260	} else {
261	args[nargs++] = "-x";
262	args[nargs++] = ( *new string( lang.c_str() ) ).c_str();
263	} // if
264	args[nargs++] = cpp_in;
265	if ( o_flag ) { // location for output
266	args[nargs++] = "-o";
267	} // if
268	args[nargs++] = cpp_out;
269	args[nargs] = nullptr; // terminate argument list
270
271	#ifdef __DEBUG_H__
272	cerr << "nargs: " << nargs << endl;
273	for ( int i = 0; args[i] != nullptr; i += 1 ) {
274	cerr << args[i] << " ";
275	} // for
276	cerr << endl;
277	#endif // __DEBUG_H__
278
279	execvp( args[0], (char * const *)args ); // should not return
280	perror( "CC1 Translator error: stage 1, execvp" );
281	exit( EXIT_FAILURE );
282	} // if
283
284	// Run the C preprocessor and save the output in the given file.
285
286	if ( fork() == 0 ) { // child process ?
287	// -o xxx.ii cannot be used to write the output file from cpp because no output file is created if cpp detects
288	// an error (e.g., cannot find include file). Whereas, output is always generated, even when there is an error,
289	// when cpp writes to stdout. Hence, stdout is redirected into the temporary file.
290	if ( freopen( cpp_out, "w", stdout ) == nullptr ) { // redirect stdout to output file
291	perror( "CC1 Translator error: stage 1, freopen" );
292	exit( EXIT_FAILURE );
293	} // if
294
295	args[0] = compiler_path.c_str();
296	if ( lang.size() == 0 ) {
297	suffix( cpp_in, args, nargs ); // check suffix
298	} else {
299	args[nargs++] = "-x";
300	args[nargs++] = ( *new string( lang.c_str() ) ).c_str();
301	} // if
302	args[nargs++] = cpp_in; // input to cpp
303	args[nargs] = nullptr; // terminate argument list
304
305	#ifdef __DEBUG_H__
306	cerr << "cpp nargs: " << nargs << endl;
307	for ( int i = 0; args[i] != nullptr; i += 1 ) {
308	cerr << args[i] << " ";
309	} // for
310	cerr << endl;
311	#endif // __DEBUG_H__
312
313	execvp( args[0], (char * const *)args ); // should not return
314	perror( "CC1 Translator error: stage 1 cpp, execvp" );
315	cerr << " invoked " << args[0] << endl;
316	exit( EXIT_FAILURE );
317	} // if
318
319	wait( &code ); // wait for child to finish
320
321	#ifdef __DEBUG_H__
322	cerr << "return code from cpp:" << WEXITSTATUS(code) << endl;
323	#endif // __DEBUG_H__
324
325	if ( WIFSIGNALED(code) ) { // child failed ?
326	rmtmpfile(); // remove tmpname
327	cerr << "CC1 Translator error: stage 1, child failed " << WTERMSIG(code) << endl;
328	exit( EXIT_FAILURE );
329	} // if
330
331	exit( WEXITSTATUS( code ) ); // bad cpp result stops top-level gcc
332	} // Stage1
333
334
335	static void Stage2( const int argc, const char * const * argv ) {
336	int code;
337	string arg;
338
339	const char * cpp_in = nullptr;
340	const char * cpp_out = nullptr;
341
342	const char * args[argc + 100]; // leave space for 100 additional cfa command line values
343	int nargs = 1; // number of arguments in args list; 0 => command name
344	const char * cargs[20]; // leave space for 20 additional cfa-cpp command line values
345	int ncargs = 1; // 0 => command name
346
347	#ifdef __DEBUG_H__
348	cerr << "Stage2" << endl;
349	#endif // __DEBUG_H__
350	checkEnv2( cargs, ncargs ); // arguments passed via environment variables
351	#ifdef __DEBUG_H__
352	for ( int i = 1; i < argc; i += 1 ) {
353	cerr << "argv[" << i << "]:\"" << argv[i] << "\"" << endl;
354	} // for
355	#endif // __DEBUG_H__
356
357	enum {
358	Color_Auto = 0,
359	Color_Always = 1,
360	Color_Never = 2,
361	} color_arg = Color_Auto;
362
363	const char * color_names[3] = { "--colors=auto", "--colors=always", "--colors=never" };
364
365	// process all the arguments
366
367	for ( int i = 1; i < argc; i += 1 ) {
368	arg = argv[i];
369	if ( prefix( arg, "-" ) ) {
370	// strip inappropriate flags
371
372	if ( prefix( arg, "-fdiagnostics-color=" ) ) {
373	string choice = arg.substr(20);
374	if ( choice == "always" ) color_arg = Color_Always;
375	else if ( choice == "never" ) color_arg = Color_Never;
376	else if ( choice == "auto" ) color_arg = Color_Auto;
377	} else if ( arg == "-fno-diagnostics-color" ) {
378	color_arg = Color_Auto;
379	} // if
380
381	if ( arg == "-quiet" \|\| arg == "-version" \|\| arg == "-fpreprocessed" \|\|
382	// Currently CFA does not suppose precompiled .h files.
383	prefix( arg, "--output-pch" ) ) {
384
385	// strip inappropriate flags with an argument
386
387	} else if ( arg == "-auxbase" \|\| arg == "-auxbase-strip" \|\| arg == "-dumpbase" \|\| arg == "-dumpdir" ) {
388	i += 1;
389	#ifdef __DEBUG_H__
390	cerr << "arg:\"" << argv[i] << "\"" << endl;
391	#endif // __DEBUG_H__
392
393	// all other flags
394
395	} else {
396	args[nargs++] = argv[i]; // pass flag along
397	if ( arg == "-o" ) {
398	i += 1;
399	cpp_out = argv[i];
400	args[nargs++] = argv[i]; // pass argument along
401	#ifdef __DEBUG_H__
402	cerr << "arg:\"" << argv[i] << "\"" << endl;
403	#endif // __DEBUG_H__
404	} // if
405	} // if
406	} else { // obtain input and possibly output files
407	if ( cpp_in == nullptr ) {
408	cpp_in = argv[i];
409	#ifdef __DEBUG_H__
410	cerr << "cpp_in:\"" << cpp_in << "\"" << endl;
411	#endif // __DEBUG_H__
412	} else if ( cpp_out == nullptr ) {
413	cpp_out = argv[i];
414	#ifdef __DEBUG_H__
415	cerr << "cpp_out:\"" << cpp_out << "\""<< endl;
416	#endif // __DEBUG_H__
417	} else {
418	cerr << "Usage: " << argv[0] << " more than two files specified" << endl;
419	exit( EXIT_FAILURE );
420	} // if
421	} // if
422	} // for
423
424	if ( cpp_in == nullptr ) {
425	cerr << "Usage: " << argv[0] << " missing input file" << endl;
426	exit( EXIT_FAILURE );
427	} // if
428	if ( cpp_out == nullptr ) {
429	cerr << "Usage: " << argv[0] << " missing output file" << endl;
430	exit( EXIT_FAILURE );
431	} // if
432
433	// Create a temporary file, if needed, to store output of the cfa-cpp preprocessor. Cannot be created in forked
434	// process because variables tmpname and tmpfilefd are cloned.
435
436	string cfa_cpp_out;
437
438	if ( ! CFA_flag ) { // run compiler ?
439	if ( save_temps ) {
440	cfa_cpp_out = cpp_in;
441	size_t dot = cfa_cpp_out.find_last_of( "." );
442	if ( dot == string::npos ) {
443	cerr << "CC1 Translator error: stage 2, bad file name " << endl;
444	exit( EXIT_FAILURE );
445	} // if
446
447	cfa_cpp_out = cfa_cpp_out.substr( 0, dot ) + CFA_SUFFIX;
448	if ( creat( cfa_cpp_out.c_str(), 0666 ) == -1 ) {
449	perror( "CC1 Translator error: stage 2, creat" );
450	exit( EXIT_FAILURE );
451	} // if
452	} else {
453	tmpfilefd = mkstemps( tmpname, 4 );
454	if ( tmpfilefd == -1 ) {
455	perror( "CC1 Translator error: stage 2, mkstemp" );
456	exit( EXIT_FAILURE );
457	} // if
458	cfa_cpp_out = tmpname;
459	} // if
460	#ifdef __DEBUG_H__
461	cerr << "cfa_cpp_out: " << cfa_cpp_out << endl;
462	#endif // __DEBUG_H__
463	} // if
464
465	// If -CFA flag specified, run the cfa-cpp preprocessor on the temporary file, and output is written to standard
466	// output. Otherwise, run the cfa-cpp preprocessor on the temporary file and save the result into the output file.
467
468	if ( fork() == 0 ) { // child runs CFA preprocessor
469	cargs[0] = ( *new string( bprefix + "cfa-cpp" ) ).c_str();
470	cargs[ncargs++] = cpp_in;
471
472	if ( CFA_flag ) { // run cfa-cpp ?
473	if ( o_file.size() != 0 ) { // location for output
474	cargs[ncargs++] = ( *new string( o_file.c_str() ) ).c_str();
475	} // if
476	} else {
477	cargs[ncargs++] = cfa_cpp_out.c_str();
478	} // if
479
480	cargs[ncargs++] = color_names[color_arg];
481
482	cargs[ncargs] = nullptr; // terminate argument list
483
484	#ifdef __DEBUG_H__
485	for ( int i = 0; cargs[i] != nullptr; i += 1 ) {
486	cerr << cargs[i] << " ";
487	} // for
488	cerr << endl;
489	#endif // __DEBUG_H__
490
491	execvp( cargs[0], (char * const *)cargs ); // should not return
492	perror( "CC1 Translator error: stage 2 cfa-cpp, execvp" );
493	cerr << " invoked " << cargs[0] << endl;
494	exit( EXIT_FAILURE );
495	} // if
496
497	wait( &code ); // wait for child to finish
498
499	if ( WIFSIGNALED(code) ) { // child failed ?
500	rmtmpfile(); // remove tmpname
501	cerr << "CC1 Translator error: stage 2, child failed " << WTERMSIG(code) << endl;
502	exit( EXIT_FAILURE );
503	} // if
504
505	if ( CFA_flag ) { // no tmpfile created
506	exit( WEXITSTATUS( code ) ); // stop regardless of success or failure
507	} // if
508
509	#ifdef __DEBUG_H__
510	cerr << "return code from cfa-cpp:" << WEXITSTATUS(code) << endl;
511	#endif // __DEBUG_H__
512
513	if ( WEXITSTATUS(code) ) { // child error ?
514	rmtmpfile(); // remove tmpname
515	exit( WEXITSTATUS( code ) ); // do not continue
516	} // if
517
518	#ifdef __DEBUG_H__
519	cerr << "args:";
520	for ( int i = 1; i < nargs; i += 1 ) {
521	cerr << " " << args[i];
522	} // for
523	cerr << " " << cpp_in << endl;
524	#endif // __DEBUG_H__
525
526	if ( fork() == 0 ) { // child runs gcc
527	args[0] = compiler_path.c_str();
528	args[nargs++] = "-S"; // only compile and put assembler output in specified file
529	args[nargs++] = "-x";
530	args[nargs++] = "cpp-output";
531
532	args[nargs++] = cfa_cpp_out.c_str();
533	args[nargs] = nullptr; // terminate argument list
534
535	#ifdef __DEBUG_H__
536	cerr << "stage2 nargs: " << nargs << endl;
537	for ( int i = 0; args[i] != nullptr; i += 1 ) {
538	cerr << args[i] << " ";
539	} // for
540	cerr << endl;
541	#endif // __DEBUG_H__
542
543	execvp( args[0], (char * const *)args ); // should not return
544	perror( "CC1 Translator error: stage 2 cc1, execvp" );
545	cerr << " invoked " << args[0] << endl;
546	exit( EXIT_FAILURE ); // tell gcc not to go any further
547	} // if
548
549	wait( &code ); // wait for child to finish
550	rmtmpfile(); // remove tmpname
551
552	if ( WIFSIGNALED(code) ) { // child failed ?
553	cerr << "CC1 Translator error: stage 2, child failed " << WTERMSIG(code) << endl;
554	exit( EXIT_FAILURE );
555	} // if
556
557	#ifdef __DEBUG_H__
558	cerr << "return code from gcc cc1:" << WEXITSTATUS(code) << endl;
559	#endif // __DEBUG_H__
560
561	exit( WEXITSTATUS( code ) ); // stop regardless of success or failure
562	} // Stage2
563
564
565	// This program is called twice because of the -no-integrated-cpp. The calls are differentiated by the first
566	// command-line argument. The first call replaces the traditional cpp pass to preprocess the C program. The second call
567	// is to the compiler, which is broken into two steps: preprocess again with cfa-cpp and then call gcc to compile the
568	// doubly preprocessed program.
569
570	int main( const int argc, const char * const argv[], __attribute__((unused)) const char * const env[] ) {
571	#ifdef __DEBUG_H__
572	for ( int i = 0; env[i] != nullptr; i += 1 ) {
573	cerr << env[i] << endl;
574	} // for
575	#endif // __DEBUG_H__
576
577	signal( SIGINT, sigTermHandler );
578	signal( SIGTERM, sigTermHandler );
579
580	string arg( argv[1] );
581
582	// Currently, stage 1 starts with flag -E and stage 2 with flag -fpreprocessed.
583
584	if ( arg == "-E" ) {
585	Stage1( argc, argv );
586	} else if ( arg == "-fpreprocessed" ) {
587	Stage2( argc, argv );
588	} else {
589	cerr << "Usage: " << argv[0] << " [-E input-file [output-file] ] \| [-fpreprocessed input-file output-file] [options]" << endl;
590	exit( EXIT_FAILURE );
591	} // if
592	} // main
593
594	// Local Variables: //
595	// tab-width: 4 //
596	// mode: c++ //
597	// compile-command: "make install" //
598	// End: //

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