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source: src/driver/cc1.cc @ cfaf9be

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Last change on this file since cfaf9be was b3c36f4, checked in by Thierry Delisle <tdelisle@…>, 7 years ago
Added some attribute((unused)) where appropriate
Property mode set to `100644`
File size: 14.5 KB

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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 : Wed Jan 18 08:14:21 2017
13	// Update Count : 81
14	//
15
16	#include <iostream>
17	using std::cerr;
18	using std::endl;
19	#include <string>
20	using std::string;
21	#include <cstdio> // stderr, stdout, perror, fprintf
22	#include <cstdlib> // getenv, exit, mkstemp
23	#include <unistd.h> // execvp, fork, unlink
24	#include <sys/wait.h> // wait
25
26	#include "config.h" // configure info
27
28
29	//#define __DEBUG_H__
30
31
32	string compiler_name( CFA_BACKEND_CC ); // path/name of C compiler
33
34	string D__GCC_BPREFIX__( "-D__GCC_BPREFIX__=" );
35	string D__CFA_FLAGPREFIX__( "-D__CFA_FLAG__=" );
36
37	char tmpname[] = P_tmpdir "/CFAXXXXXX";
38	int tmpfilefd = -1;
39
40
41	bool prefix( string arg, string pre ) {
42	return arg.substr( 0, pre.size() ) == pre;
43	} // prefix
44
45
46	void checkEnv( const char *args[], int &nargs ) {
47	char *value;
48
49	value = getenv( "__COMPILER__" );
50	if ( value != NULL ) {
51	compiler_name = value;
52	#ifdef __DEBUG_H__
53	cerr << "env arg:\"" << compiler_name << "\"" << endl;
54	#endif // __DEBUG_H__
55	} // if
56
57	value = getenv( "__GCC_MACHINE__" );
58	if ( value != NULL ) {
59	args[nargs] = ( *new string( value ) ).c_str(); // pass the argument along
60	#ifdef __DEBUG_H__
61	cerr << "env arg:\"" << args[nargs] << "\"" << endl;
62	#endif // __DEBUG_H__
63	nargs += 1;
64	} // if
65
66	value = getenv( "__GCC_VERSION__" );
67	if ( value != NULL ) {
68	args[nargs] = ( *new string( value ) ).c_str(); // pass the argument along
69	#ifdef __DEBUG_H__
70	cerr << "env arg:\"" << args[nargs] << "\"" << endl;
71	#endif // __DEBUG_H__
72	nargs += 1;
73	} // if
74	} // checkEnv
75
76
77	void rmtmpfile() {
78	if ( unlink( tmpname ) == -1 ) { // remove tmpname
79	perror ( "CFA Translator error: cpp failed" );
80	exit( EXIT_FAILURE );
81	} // if
82	tmpfilefd = -1; // mark closed
83	} // rmtmpfile
84
85
86	void sigTermHandler( __attribute__((unused)) int signal ) {
87	if ( tmpfilefd != -1 ) { // RACE, file created ?
88	rmtmpfile(); // remove
89	exit( EXIT_FAILURE ); // terminate
90	} // if
91	} // sigTermHandler
92
93
94	void Stage1( const int argc, const char * const argv[] ) {
95	int code;
96	int i;
97
98	string arg;
99	string bprefix;
100
101	const char *cpp_in = NULL;
102	const char *cpp_out = NULL;
103
104	bool CFA_flag = false;
105	bool cpp_flag = false;
106	const char *o_name = NULL;
107
108	const char *args[argc + 100]; // leave space for 100 additional cpp command line values
109	int nargs = 1; // number of arguments in args list; 0 => command name
110	const char *cargs[20]; // leave space for 20 additional cfa-cpp command line values
111	int ncargs = 1; // 0 => command name
112
113	signal( SIGINT, sigTermHandler );
114	signal( SIGTERM, sigTermHandler );
115
116	#ifdef __DEBUG_H__
117	cerr << "Stage1" << endl;
118	#endif // __DEBUG_H__
119
120	// process all the arguments
121
122	checkEnv( args, nargs ); // arguments passed via environment variables
123
124	for ( i = 1; i < argc; i += 1 ) {
125	#ifdef __DEBUG_H__
126	cerr << "argv[" << i << "]:\"" << argv[i] << "\"" << endl;
127	#endif // __DEBUG_H__
128	arg = argv[i];
129	#ifdef __DEBUG_H__
130	cerr << "arg:\"" << arg << "\"" << endl;
131	#endif // __DEBUG_H__
132	if ( prefix( arg, "-" ) ) {
133	// strip g++ flags that are inappropriate or cause duplicates in subsequent passes
134
135	if ( arg == "-quiet" ) {
136	} else if ( arg == "-imultilib" \|\| arg == "-imultiarch" ) {
137	i += 1; // and the argument
138	} else if ( prefix( arg, "-A" ) ) {
139	} else if ( prefix( arg, "-D__GNU" ) ) {
140	//********
141	// GCC 5.6.0 SEPARATED THE -D FROM THE ARGUMENT!
142	//********
143	} else if ( arg == "-D" && prefix( argv[i + 1], "__GNU" ) ) {
144	i += 1; // and the argument
145
146	// strip flags controlling cpp step
147
148	} else if ( arg == "-D__CPP__" ) {
149	cpp_flag = true;
150	} else if ( arg == "-D" && string( argv[i + 1] ) == "__CPP__" ) {
151	i += 1; // and the argument
152	cpp_flag = true;
153	} else if ( arg == "-D__CFA_PREPROCESS__" ) {
154	CFA_flag = true;
155	} else if ( arg == "-D" && string( argv[i + 1] ) == "__CFA_PREPROCESS__" ) {
156	i += 1; // and the argument
157	CFA_flag = true;
158	} else if ( prefix( arg, D__CFA_FLAGPREFIX__ ) ) {
159	cargs[ncargs] = ( *new string( arg.substr( D__CFA_FLAGPREFIX__.size() ) ) ).c_str();
160	ncargs += 1;
161	} else if ( arg == "-D" && prefix( argv[i + 1], D__CFA_FLAGPREFIX__.substr(2) ) ) {
162	cargs[ncargs] = ( *new string( string( argv[i + 1] ).substr( D__CFA_FLAGPREFIX__.size() - 2 ) ) ).c_str();
163	ncargs += 1;
164	i += 1; // and the argument
165	} else if ( prefix( arg, D__GCC_BPREFIX__ ) ) {
166	bprefix = arg.substr( D__GCC_BPREFIX__.size() );
167	} else if ( arg == "-D" && prefix( argv[i + 1], D__GCC_BPREFIX__.substr(2) ) ) {
168	bprefix = string( argv[i + 1] ).substr( D__GCC_BPREFIX__.size() - 2 );
169	i += 1; // and the argument
170
171	// all other flags
172
173	} else if ( arg == "-o" ) {
174	i += 1;
175	o_name = argv[i];
176	} else {
177	args[nargs] = argv[i]; // pass the flag along
178	nargs += 1;
179	// CPP flags with an argument
180	if ( arg == "-D" \|\| arg == "-U" \|\| arg == "-I" \|\| arg == "-MF" \|\| arg == "-MT" \|\| arg == "-MQ" \|\|
181	arg == "-include" \|\| arg == "-imacros" \|\| arg == "-idirafter" \|\| arg == "-iprefix" \|\|
182	arg == "-iwithprefix" \|\| arg == "-iwithprefixbefore" \|\| arg == "-isystem" \|\| arg == "-isysroot" ) {
183	i += 1;
184	args[nargs] = argv[i]; // pass the argument along
185	nargs += 1;
186	#ifdef __DEBUG_H__
187	cerr << "argv[" << i << "]:\"" << argv[i] << "\"" << endl;
188	#endif // __DEBUG_H__
189	} else if ( arg == "-MD" \|\| arg == "-MMD" ) {
190	args[nargs] = "-MF"; // insert before file
191	nargs += 1;
192	i += 1;
193	args[nargs] = argv[i]; // pass the argument along
194	nargs += 1;
195	#ifdef __DEBUG_H__
196	cerr << "argv[" << i << "]:\"" << argv[i] << "\"" << endl;
197	#endif // __DEBUG_H__
198	} // if
199	} // if
200	} else { // obtain input and possibly output files
201	if ( cpp_in == NULL ) {
202	cpp_in = argv[i];
203	#ifdef __DEBUG_H__
204	cerr << "cpp_in:\"" << cpp_in << "\"" << endl;
205	#endif // __DEBUG_H__
206	} else if ( cpp_out == NULL ) {
207	cpp_out = argv[i];
208	#ifdef __DEBUG_H__
209	cerr << "cpp_out:\"" << cpp_out << "\""<< endl;
210	#endif // __DEBUG_H__
211	} else {
212	cerr << "Usage: " << argv[0] << " input-file [output-file] [options]" << endl;
213	exit( EXIT_FAILURE );
214	} // if
215	} // if
216	} // for
217
218	#ifdef __DEBUG_H__
219	cerr << "args:";
220	for ( i = 1; i < nargs; i += 1 ) {
221	cerr << " " << args[i];
222	} // for
223	if ( cpp_in != NULL ) cerr << " " << cpp_in;
224	if ( cpp_out != NULL ) cerr << " " << cpp_out;
225	cerr << endl;
226	#endif // __DEBUG_H__
227
228	if ( cpp_in == NULL ) {
229	cerr << "Usage: " << argv[0] << " input-file [output-file] [options]" << endl;
230	exit( EXIT_FAILURE );
231	} // if
232
233	if ( cpp_flag ) {
234	// The -E flag is specified on the cfa command so only run the preprocessor and output is written to standard
235	// output or -o. The call to cfa has a -E so it does not have to be added to the argument list.
236
237	args[0] = compiler_name.c_str();
238	args[nargs] = cpp_in;
239	nargs += 1;
240	if ( o_name != NULL ) { // location for output
241	args[nargs] = "-o";
242	nargs += 1;
243	args[nargs] = o_name;
244	nargs += 1;
245	} // if
246	args[nargs] = NULL; // terminate argument list
247
248	#ifdef __DEBUG_H__
249	cerr << "nargs: " << nargs << endl;
250	for ( i = 0; args[i] != NULL; i += 1 ) {
251	cerr << args[i] << " ";
252	} // for
253	cerr << endl;
254	#endif // __DEBUG_H__
255
256	execvp( args[0], (char const )args ); // should not return
257	perror( "CFA Translator error: cpp level, execvp" );
258	exit( EXIT_FAILURE );
259	} // if
260
261	// Create a temporary file to store output of the C preprocessor.
262
263	tmpfilefd = mkstemp( tmpname );
264	if ( tmpfilefd == -1 ) {
265	perror( "CFA Translator error: cpp level, mkstemp" );
266	exit( EXIT_FAILURE );
267	} // if
268
269	#ifdef __DEBUG_H__
270	cerr << "tmpname:" << tmpname << " tmpfilefd:" << tmpfilefd << endl;
271	#endif // __DEBUG_H__
272
273	// Run the C preprocessor and save the output in tmpfile.
274
275	if ( fork() == 0 ) { // child process ?
276	// -o xxx.ii cannot be used to write the output file from cpp because no output file is created if cpp detects
277	// an error (e.g., cannot find include file). Whereas, output is always generated, even when there is an error,
278	// when cpp writes to stdout. Hence, stdout is redirected into the temporary file.
279	if ( freopen( tmpname, "w", stdout ) == NULL ) { // redirect stdout to tmpname
280	perror( "CFA Translator error: cpp level, freopen" );
281	exit( EXIT_FAILURE );
282	} // if
283
284	args[0] = compiler_name.c_str();
285	args[nargs] = cpp_in; // input to cpp
286	nargs += 1;
287	args[nargs] = NULL; // terminate argument list
288
289	#ifdef __DEBUG_H__
290	cerr << "cpp nargs: " << nargs << endl;
291	for ( i = 0; args[i] != NULL; i += 1 ) {
292	cerr << args[i] << " ";
293	} // for
294	cerr << endl;
295	#endif // __DEBUG_H__
296
297	execvp( args[0], (char const )args ); // should not return
298	perror( "CFA Translator error: cpp level, execvp" );
299	exit( EXIT_FAILURE );
300	} // if
301
302	wait( &code ); // wait for child to finish
303
304	#ifdef __DEBUG_H__
305	cerr << "return code from cpp:" << WEXITSTATUS(code) << endl;
306	#endif // __DEBUG_H__
307
308	if ( WIFSIGNALED(code) != 0 ) { // child failed ?
309	rmtmpfile(); // remove tmpname
310	cerr << "CFA Translator error: cpp failed with signal " << WTERMSIG(code) << endl;
311	exit( EXIT_FAILURE );
312	} // if
313
314	if ( WEXITSTATUS(code) != 0 ) { // child error ?
315	rmtmpfile(); // remove tmpname
316	exit( WEXITSTATUS( code ) ); // do not continue
317	} // if
318
319	// If -CFA flag specified, run the cfa-cpp preprocessor on the temporary file, and output is written to standard
320	// output. Otherwise, run the cfa-cpp preprocessor on the temporary file and save the result into the output file.
321
322	if ( fork() == 0 ) { // child runs CFA
323	cargs[0] = ( *new string( bprefix + "/cfa-cpp" ) ).c_str();
324
325	// Source file-name used to generate routine names containing global initializations for TU.
326	cargs[ncargs] = ( *new string( "-F" ) ).c_str();
327	ncargs += 1;
328	cargs[ncargs] = ( *new string( string( cpp_in ) ) ).c_str();
329	ncargs += 1;
330
331	cargs[ncargs] = tmpname;
332	ncargs += 1;
333	if ( o_name != NULL ) {
334	cargs[ncargs] = o_name;
335	ncargs += 1;
336	} else if ( ! CFA_flag ) { // run cfa-cpp ?
337	cargs[ncargs] = cpp_out;
338	ncargs += 1;
339	} // if
340	cargs[ncargs] = NULL; // terminate argument list
341
342	#ifdef __DEBUG_H__
343	cerr << "cfa-cpp ncargs: " << o_name << " " << CFA_flag << " " << ncargs << endl;
344	for ( i = 0; cargs[i] != NULL; i += 1 ) {
345	cerr << cargs[i] << " ";
346	} // for
347	cerr << endl;
348	#endif // __DEBUG_H__
349
350	execvp( cargs[0], (char * const *)cargs ); // should not return
351	perror( "CFA Translator error: cpp level, execvp" );
352	exit( EXIT_FAILURE );
353	} // if
354
355	wait( &code ); // wait for child to finish
356
357	#ifdef __DEBUG_H__
358	cerr << "return code from cfa-cpp:" << WEXITSTATUS(code) << endl;
359	#endif // __DEBUG_H__
360
361	// Must unlink here because file must exist across execvp.
362	rmtmpfile(); // remove tmpname
363
364	if ( WIFSIGNALED(code) ) { // child failed ?
365	cerr << "CFA Translator error: cfa-cpp failed with signal " << WTERMSIG(code) << endl;
366	exit( EXIT_FAILURE );
367	} // if
368
369	exit( WEXITSTATUS(code) );
370	} // Stage1
371
372
373	void Stage2( const int argc, const char * const * argv ) {
374	int i;
375
376	string arg;
377
378	const char *cpp_in = NULL;
379
380	const char *args[argc + 100]; // leave space for 100 additional cfa command line values
381	int nargs = 1; // number of arguments in args list; 0 => command name
382
383	#ifdef __DEBUG_H__
384	cerr << "Stage2" << endl;
385	#endif // __DEBUG_H__
386
387	// process all the arguments
388
389	checkEnv( args, nargs ); // arguments passed via environment variables
390
391	for ( i = 1; i < argc; i += 1 ) {
392	#ifdef __DEBUG_H__
393	cerr << "argv[" << i << "]:\"" << argv[i] << "\"" << endl;
394	#endif // __DEBUG_H__
395	arg = argv[i];
396	#ifdef __DEBUG_H__
397	cerr << "arg:\"" << arg << "\"" << endl;
398	#endif // __DEBUG_H__
399	if ( prefix( arg, "-" ) ) {
400	// strip inappropriate flags
401
402	if ( arg == "-quiet" \|\| arg == "-version" \|\| arg == "-fpreprocessed" \|\|
403	// Currently CFA does not suppose precompiled .h files.
404	prefix( arg, "--output-pch" ) ) {
405
406	// strip inappropriate flags with an argument
407
408	} else if ( arg == "-auxbase" \|\| arg == "-auxbase-strip" \|\| arg == "-dumpbase" ) {
409	i += 1;
410	#ifdef __DEBUG_H__
411	cerr << "arg:\"" << argv[i] << "\"" << endl;
412	#endif // __DEBUG_H__
413
414	// all other flags
415
416	} else {
417	args[nargs] = argv[i]; // pass the flag along
418	nargs += 1;
419	if ( arg == "-o" ) {
420	i += 1;
421	args[nargs] = argv[i]; // pass the argument along
422	nargs += 1;
423	#ifdef __DEBUG_H__
424	cerr << "arg:\"" << argv[i] << "\"" << endl;
425	#endif // __DEBUG_H__
426	} // if
427	} // if
428	} else { // obtain input and possibly output files
429	if ( cpp_in == NULL ) {
430	cpp_in = argv[i];
431	#ifdef __DEBUG_H__
432	cerr << "cpp_in:\"" << cpp_in << "\"" << endl;
433	#endif // __DEBUG_H__
434	} else {
435	cerr << "Usage: " << argv[0] << " input-file [output-file] [options]" << endl;
436	exit( EXIT_FAILURE );
437	} // if
438	} // if
439	} // for
440
441	#ifdef __DEBUG_H__
442	cerr << "args:";
443	for ( i = 1; i < nargs; i += 1 ) {
444	cerr << " " << args[i];
445	} // for
446	cerr << endl;
447	if ( cpp_in != NULL ) cerr << " " << cpp_in;
448	#endif // __DEBUG_H__
449
450	args[0] = compiler_name.c_str();
451	args[nargs] = "-S"; // only compile and put assembler output in specified file
452	nargs += 1;
453	args[nargs] = cpp_in;
454	nargs += 1;
455	args[nargs] = NULL; // terminate argument list
456
457	#ifdef __DEBUG_H__
458	cerr << "stage2 nargs: " << nargs << endl;
459	for ( i = 0; args[i] != NULL; i += 1 ) {
460	cerr << args[i] << " ";
461	} // for
462	cerr << endl;
463	#endif // __DEBUG_H__
464
465	execvp( args[0], (char * const *)args ); // should not return
466	perror( "CFA Translator error: cpp level, execvp" );
467	exit( EXIT_FAILURE ); // tell gcc not to go any further
468	} // Stage2
469
470
471	int main( const int argc, const char * const argv[], __attribute__((unused)) const char * const env[] ) {
472	#ifdef __DEBUG_H__
473	for ( int i = 0; env[i] != NULL; i += 1 ) {
474	cerr << env[i] << endl;
475	} // for
476	#endif // __DEBUG_H__
477
478	string arg = argv[1];
479
480	// Currently, stage 1 starts with flag -E and stage 2 with flag -fpreprocessed.
481
482	if ( arg == "-E" ) {
483	Stage1( argc, argv );
484	} else if ( arg == "-fpreprocessed" ) {
485	Stage2( argc, argv );
486	} else {
487	cerr << "Usage: " << argv[0] << " input-file [output-file] [options]" << endl;
488	exit( EXIT_FAILURE );
489	} // if
490	} // main
491
492	// Local Variables: //
493	// tab-width: 4 //
494	// mode: c++ //
495	// compile-command: "make install" //
496	// End: //

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