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Copy pathheaders.cpp
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195 lines (165 loc) · 5.4 KB
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/*
* Copyright 1993, 2000 Christopher Seiwald.
*
* This file is part of Jam - see jam.c for Copyright information.
*/
/* This file is ALSO:
* Copyright 2001-2004 David Abrahams.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE.txt or https://www.bfgroup.xyz/b2/LICENSE.txt)
*/
/*
* headers.c - handle #includes in source files
*
* Using regular expressions provided as the variable $(HDRSCAN), headers()
* searches a file for #include files and phonies up a rule invocation:
* $(HDRRULE) <target> : <include files> ;
*
* External routines:
* headers() - scan a target for include files and call HDRRULE
*
* Internal routines:
* headers1() - using regexp, scan a file and build include LIST
*/
#include "jam.h"
#include "headers.h"
#include "constants.h"
#include "compile.h"
#include "frames.h"
#include "lists.h"
#include "modules.h"
#include "object.h"
#include "parse.h"
#include "regexp.h"
#include "rules.h"
#include "variable.h"
#include "output.h"
#ifdef OPT_HEADER_CACHE_EXT
# include "hcache.h"
#endif
#include <errno.h>
#include <stdio.h>
#include <string>
// max numebr of regular expression sourced from HDRSCAN
#define MAX_SCAN_REGEXPS 10
/*
* headers() - scan a target for include files and call HDRRULE
*/
void headers( TARGET * t )
{
module_t * rootm = root_module();
b2::list_cref hdrscan( var_get( rootm, constant_HDRSCAN ) );
if ( hdrscan.empty() ) return;
b2::list_cref hdrrule( var_get( rootm, constant_HDRRULE ) );
if ( hdrrule.empty() ) return;
if ( is_debug_header() )
out_printf( "header scan %s\n", object_str( t->name ) );
b2::list_cref fln_arg( var_get( rootm, constant_FILENAME ) );
b2::value_ptr file_ptr = fln_arg.empty() ? nullptr : list_front( *fln_arg );
b2::list_cref mod_arg( var_get( rootm, constant_MODULE ) );
b2::value_ptr user_mod = mod_arg.empty() ? nullptr : list_front( *mod_arg );
// this is used for error reporting purposes only
FRAME frame_re[ 1 ];
frame_init( frame_re );
std::string varname = std::string("HDRSCAN on ") + object_str( t->name );
frame_re->rulename = varname.c_str();
lol_add( frame_re->args, list_copy( *hdrscan ) );
// try to retrieve at least the user jamfile filename
if (file_ptr)
{
frame_re->file = file_ptr;
frame_re->line = 0; // only filename is known
}
// compile all regular expressions in HDRSCAN
b2::regex::program re_prog[MAX_SCAN_REGEXPS];
int rec = 0;
{
// compilation errors print a nice error message and exit
b2::regex::frame_ctx ctx(frame_re);
b2::list_cref::iterator iter = hdrscan.begin();
b2::list_cref::iterator end = hdrscan.end();
for ( ; ( rec < MAX_SCAN_REGEXPS ) && iter != end; iter++ )
{
re_prog[ rec ].reset( (*iter)->str() );
rec += 1;
}
}
FRAME frame[ 1 ];
frame_init( frame );
frame->prev = frame_re;
varname = std::string("HDRRULE on ") + object_str( t->name );
frame_re->rulename = varname.c_str();
if (user_mod)
{
// do not thrust user_mod, search for module with find_module
frame->module = find_module(user_mod);
if (! frame->module) frame->module = rootm;
}
// Get LIST of included files
lol_add( frame->args, list_new( object_copy( t->name ) ) );
#ifdef OPT_HEADER_CACHE_EXT
lol_add( frame->args, hcache( t, rec, re_prog, *hdrscan ) );
#else
LIST * headlist = L0;
lol_add( frame->args, headers1( headlist, t->boundname, rec, re_prog ) );
#endif
// Call HDRRULE rule
if ( lol_get( frame->args, 1 ) )
{
b2::value_ptr rulename = list_front( *hdrrule );
// The third argument to HDRRULE is the bound name of $(<).
lol_add( frame->args, list_new( object_copy( t->boundname ) ) );
list_free( evaluate_rule( bindrule( rulename, frame->module ), rulename, frame ) );
}
// Clean up.
frame_free( frame );
frame_free( frame_re );
}
#undef MAX_SCAN_REGEXPS
/*
* headers1() - using regexp, scan a file and build include LIST.
*/
LIST * headers1( LIST * l, OBJECT * file, int rec, b2::regex::program re[] )
{
FILE * f;
char buf[ 1024 ];
int i;
#ifdef OPT_IMPROVED_PATIENCE_EXT
static int count = 0;
++count;
if ( ( ( count == 100 ) || !( count % 1000 ) ) && is_debug_make() )
{
out_printf( "...patience...\n" );
out_flush();
}
#endif
if ( file->as_string().size() == 0 )
{
/* If the scanning was fed empty file names we just ignore them. */
return l;
}
if ( !( f = fopen( object_str( file ), "r" ) ) )
{
/* No source files will be generated when -n flag is passed */
if ( !globs.noexec || errno != ENOENT )
err_printf( "[errno %d] failed to scan file '%s': %s",
errno, object_str( file ), strerror(errno) );
return l;
}
while ( fgets( buf, sizeof( buf ), f ) )
{
for ( i = 0; i < rec; ++i )
{
auto re_i = re [ i ].search( buf );
if ( re_i && re_i[ 1 ].begin() )
{
std::string header(re_i[ 1 ].begin(), re_i[ 1 ].end());
if ( is_debug_header() )
out_printf( "header found: %s\n", header.c_str() );
l = list_push_back( l, object_new( header.c_str() ) );
}
}
}
fclose( f );
return l;
}