build system overhaul
This commit is contained in:
Denis Vlasenko
398
scripts/basic/docproc.c
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398
scripts/basic/docproc.c
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@ -0,0 +1,398 @@
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/*
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* docproc is a simple preprocessor for the template files
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* used as placeholders for the kernel internal documentation.
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* docproc is used for documentation-frontend and
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* dependency-generator.
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* The two usages have in common that they require
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* some knowledge of the .tmpl syntax, therefore they
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* are kept together.
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*
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* documentation-frontend
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* Scans the template file and call kernel-doc for
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* all occurrences of ![EIF]file
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* Beforehand each referenced file are scanned for
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* any exported sympols "EXPORT_SYMBOL()" statements.
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* This is used to create proper -function and
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* -nofunction arguments in calls to kernel-doc.
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* Usage: docproc doc file.tmpl
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*
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* dependency-generator:
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* Scans the template file and list all files
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* referenced in a format recognized by make.
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* Usage: docproc depend file.tmpl
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* Writes dependency information to stdout
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* in the following format:
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* file.tmpl src.c src2.c
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* The filenames are obtained from the following constructs:
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* !Efilename
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* !Ifilename
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* !Dfilename
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* !Ffilename
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <limits.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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/* exitstatus is used to keep track of any failing calls to kernel-doc,
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* but execution continues. */
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int exitstatus = 0;
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typedef void DFL(char *);
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DFL *defaultline;
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typedef void FILEONLY(char * file);
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FILEONLY *internalfunctions;
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FILEONLY *externalfunctions;
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FILEONLY *symbolsonly;
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typedef void FILELINE(char * file, char * line);
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FILELINE * singlefunctions;
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FILELINE * entity_system;
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#define MAXLINESZ 2048
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#define MAXFILES 250
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#define KERNELDOCPATH "scripts/"
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#define KERNELDOC "kernel-doc"
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#define DOCBOOK "-docbook"
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#define FUNCTION "-function"
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#define NOFUNCTION "-nofunction"
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void usage (void)
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{
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fprintf(stderr, "Usage: docproc {doc|depend} file\n");
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fprintf(stderr, "Input is read from file.tmpl. Output is sent to stdout\n");
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fprintf(stderr, "doc: frontend when generating kernel documentation\n");
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fprintf(stderr, "depend: generate list of files referenced within file\n");
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}
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/*
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* Execute kernel-doc with parameters givin in svec
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*/
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void exec_kernel_doc(char **svec)
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{
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pid_t pid;
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int ret;
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char real_filename[PATH_MAX + 1];
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/* Make sure output generated so far are flushed */
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fflush(stdout);
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switch(pid=fork()) {
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case -1:
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perror("fork");
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exit(1);
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case 0:
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memset(real_filename, 0, sizeof(real_filename));
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strncat(real_filename, getenv("SRCTREE"), PATH_MAX);
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strncat(real_filename, KERNELDOCPATH KERNELDOC,
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PATH_MAX - strlen(real_filename));
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execvp(real_filename, svec);
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fprintf(stderr, "exec ");
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perror(real_filename);
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exit(1);
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default:
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waitpid(pid, &ret ,0);
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}
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if (WIFEXITED(ret))
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exitstatus |= WEXITSTATUS(ret);
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else
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exitstatus = 0xff;
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}
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/* Types used to create list of all exported symbols in a number of files */
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struct symbols
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{
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char *name;
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};
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struct symfile
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{
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char *filename;
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struct symbols *symbollist;
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int symbolcnt;
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};
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struct symfile symfilelist[MAXFILES];
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int symfilecnt = 0;
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void add_new_symbol(struct symfile *sym, char * symname)
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{
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sym->symbollist =
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realloc(sym->symbollist, (sym->symbolcnt + 1) * sizeof(char *));
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sym->symbollist[sym->symbolcnt++].name = strdup(symname);
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}
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/* Add a filename to the list */
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struct symfile * add_new_file(char * filename)
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{
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symfilelist[symfilecnt++].filename = strdup(filename);
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return &symfilelist[symfilecnt - 1];
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}
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/* Check if file already are present in the list */
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struct symfile * filename_exist(char * filename)
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{
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int i;
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for (i=0; i < symfilecnt; i++)
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if (strcmp(symfilelist[i].filename, filename) == 0)
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return &symfilelist[i];
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return NULL;
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}
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/*
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* List all files referenced within the template file.
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* Files are separated by tabs.
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*/
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void adddep(char * file) { printf("\t%s", file); }
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void adddep2(char * file, char * line) { line = line; adddep(file); }
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void noaction(char * line) { line = line; }
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void noaction2(char * file, char * line) { file = file; line = line; }
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/* Echo the line without further action */
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void printline(char * line) { printf("%s", line); }
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/*
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* Find all symbols exported with EXPORT_SYMBOL and EXPORT_SYMBOL_GPL
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* in filename.
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* All symbols located are stored in symfilelist.
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*/
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void find_export_symbols(char * filename)
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{
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FILE * fp;
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struct symfile *sym;
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char line[MAXLINESZ];
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if (filename_exist(filename) == NULL) {
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char real_filename[PATH_MAX + 1];
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memset(real_filename, 0, sizeof(real_filename));
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strncat(real_filename, getenv("SRCTREE"), PATH_MAX);
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strncat(real_filename, filename,
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PATH_MAX - strlen(real_filename));
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sym = add_new_file(filename);
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fp = fopen(real_filename, "r");
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if (fp == NULL)
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{
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fprintf(stderr, "docproc: ");
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perror(real_filename);
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}
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while(fgets(line, MAXLINESZ, fp)) {
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char *p;
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char *e;
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if (((p = strstr(line, "EXPORT_SYMBOL_GPL")) != 0) ||
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((p = strstr(line, "EXPORT_SYMBOL")) != 0)) {
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/* Skip EXPORT_SYMBOL{_GPL} */
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while (isalnum(*p) || *p == '_')
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p++;
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/* Remove paranteses and additional ws */
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while (isspace(*p))
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p++;
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if (*p != '(')
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continue; /* Syntax error? */
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else
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p++;
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while (isspace(*p))
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p++;
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e = p;
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while (isalnum(*e) || *e == '_')
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e++;
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*e = '\0';
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add_new_symbol(sym, p);
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}
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}
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fclose(fp);
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}
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}
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/*
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* Document all external or internal functions in a file.
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* Call kernel-doc with following parameters:
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* kernel-doc -docbook -nofunction function_name1 filename
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* function names are obtained from all the the src files
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* by find_export_symbols.
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* intfunc uses -nofunction
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* extfunc uses -function
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*/
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void docfunctions(char * filename, char * type)
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{
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int i,j;
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int symcnt = 0;
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int idx = 0;
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char **vec;
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for (i=0; i <= symfilecnt; i++)
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symcnt += symfilelist[i].symbolcnt;
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vec = malloc((2 + 2 * symcnt + 2) * sizeof(char*));
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if (vec == NULL) {
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perror("docproc: ");
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exit(1);
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}
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vec[idx++] = KERNELDOC;
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vec[idx++] = DOCBOOK;
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for (i=0; i < symfilecnt; i++) {
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struct symfile * sym = &symfilelist[i];
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for (j=0; j < sym->symbolcnt; j++) {
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vec[idx++] = type;
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vec[idx++] = sym->symbollist[j].name;
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}
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}
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vec[idx++] = filename;
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vec[idx] = NULL;
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printf("<!-- %s -->\n", filename);
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exec_kernel_doc(vec);
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fflush(stdout);
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free(vec);
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}
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void intfunc(char * filename) { docfunctions(filename, NOFUNCTION); }
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void extfunc(char * filename) { docfunctions(filename, FUNCTION); }
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/*
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* Document sp<73>ecific function(s) in a file.
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* Call kernel-doc with the following parameters:
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* kernel-doc -docbook -function function1 [-function function2]
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*/
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void singfunc(char * filename, char * line)
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{
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char *vec[200]; /* Enough for specific functions */
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int i, idx = 0;
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int startofsym = 1;
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vec[idx++] = KERNELDOC;
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vec[idx++] = DOCBOOK;
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/* Split line up in individual parameters preceeded by FUNCTION */
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for (i=0; line[i]; i++) {
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if (isspace(line[i])) {
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line[i] = '\0';
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startofsym = 1;
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continue;
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}
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if (startofsym) {
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startofsym = 0;
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vec[idx++] = FUNCTION;
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vec[idx++] = &line[i];
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}
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}
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vec[idx++] = filename;
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vec[idx] = NULL;
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exec_kernel_doc(vec);
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}
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/*
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* Parse file, calling action specific functions for:
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* 1) Lines containing !E
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* 2) Lines containing !I
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* 3) Lines containing !D
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* 4) Lines containing !F
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* 5) Default lines - lines not matching the above
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*/
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void parse_file(FILE *infile)
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{
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char line[MAXLINESZ];
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char * s;
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while(fgets(line, MAXLINESZ, infile)) {
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if (line[0] == '!') {
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s = line + 2;
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switch (line[1]) {
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case 'E':
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while (*s && !isspace(*s)) s++;
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*s = '\0';
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externalfunctions(line+2);
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break;
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case 'I':
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while (*s && !isspace(*s)) s++;
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*s = '\0';
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internalfunctions(line+2);
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break;
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case 'D':
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while (*s && !isspace(*s)) s++;
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*s = '\0';
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symbolsonly(line+2);
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break;
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case 'F':
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/* filename */
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while (*s && !isspace(*s)) s++;
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*s++ = '\0';
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/* function names */
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while (isspace(*s))
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s++;
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singlefunctions(line +2, s);
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break;
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default:
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defaultline(line);
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}
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}
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else {
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defaultline(line);
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}
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}
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fflush(stdout);
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}
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int main(int argc, char *argv[])
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{
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FILE * infile;
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if (argc != 3) {
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usage();
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exit(1);
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}
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/* Open file, exit on error */
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infile = fopen(argv[2], "r");
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if (infile == NULL) {
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fprintf(stderr, "docproc: ");
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perror(argv[2]);
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exit(2);
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}
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if (strcmp("doc", argv[1]) == 0)
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{
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/* Need to do this in two passes.
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* First pass is used to collect all symbols exported
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* in the various files.
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* Second pass generate the documentation.
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* This is required because function are declared
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* and exported in different files :-((
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*/
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/* Collect symbols */
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defaultline = noaction;
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internalfunctions = find_export_symbols;
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externalfunctions = find_export_symbols;
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symbolsonly = find_export_symbols;
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singlefunctions = noaction2;
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parse_file(infile);
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/* Rewind to start from beginning of file again */
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fseek(infile, 0, SEEK_SET);
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defaultline = printline;
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internalfunctions = intfunc;
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externalfunctions = extfunc;
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symbolsonly = printline;
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singlefunctions = singfunc;
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parse_file(infile);
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}
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else if (strcmp("depend", argv[1]) == 0)
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{
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/* Create first part of dependency chain
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* file.tmpl */
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printf("%s\t", argv[2]);
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defaultline = noaction;
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internalfunctions = adddep;
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externalfunctions = adddep;
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symbolsonly = adddep;
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singlefunctions = adddep2;
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parse_file(infile);
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printf("\n");
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}
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else
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{
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fprintf(stderr, "Unknown option: %s\n", argv[1]);
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exit(1);
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}
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fclose(infile);
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fflush(stdout);
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return exitstatus;
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}
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