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freebsd/usr.bin/make/parse.c
Hartmut Brandt ba467ce430 Make the structure for handling the input stack local to the parse 
module. The only module accessing it (the current line number) was the
condition module, so pass the current line number as a function argument.
Centralize the pushing of new input sources into one function
ParsePushInput() and rename the function handling the popping from ParseEOF()
to ParsePopInput(). Make the entire thing a little bit clearer, by holding
the current input source in the top element of the stack instead of
using extra variables for this. Use a type-safe intrusive list for the
input stack.
2005-03-30 15:18:58 +00:00

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/*-
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)parse.c 8.3 (Berkeley) 3/19/94
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*-
* parse.c --
* Functions to parse a makefile.
*
* One function, Parse_Init, must be called before any functions
* in this module are used. After that, the function Parse_File is the
* main entry point and controls most of the other functions in this
* module.
*
* Most important structures are kept in Lsts. Directories for
* the #include "..." function are kept in the 'parseIncPath' Lst, while
* those for the #include <...> are kept in the 'sysIncPath' Lst. The
* targets currently being defined are kept in the 'targets' Lst.
*
* The variables 'curFile.fname' and 'curFile.lineno' are used to track
* the name of the current file and the line number in that file so that
* error messages can be more meaningful.
*
* Interface:
* Parse_Init Initialization function which must be
* called before anything else in this module is used.
*
* Parse_File Function used to parse a makefile. It must
* be given the name of the file, which should
* already have been opened, and a function
* to call to read a character from the file.
*
* Parse_IsVar Returns TRUE if the given line is a
* variable assignment. Used by MainParseArgs
* to determine if an argument is a target
* or a variable assignment. Used internally
* for pretty much the same thing...
*
* Parse_Error Function called when an error occurs in
* parsing. Used by the variable and
* conditional modules.
*
* Parse_MainName Returns a Lst of the main target to create.
*/
#include <assert.h>
#include <ctype.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <err.h>
#include "arch.h"
#include "buf.h"
#include "cond.h"
#include "config.h"
#include "dir.h"
#include "for.h"
#include "globals.h"
#include "GNode.h"
#include "job.h"
#include "make.h"
#include "nonints.h"
#include "parse.h"
#include "pathnames.h"
#include "str.h"
#include "suff.h"
#include "targ.h"
#include "util.h"
#include "var.h"
/*
* These values are returned by ParsePopInput to tell Parse_File whether to
* CONTINUE parsing, i.e. it had only reached the end of an include file,
* or if it's DONE.
*/
#define CONTINUE 1
#define DONE 0
/* targets we're working on */
static Lst targets = Lst_Initializer(targets);
/* true if currently in a dependency line or its commands */
static Boolean inLine;
static int fatals = 0;
/*
* The main target to create. This is the first target on the
* first dependency line in the first makefile.
*/
static GNode *mainNode;
/*
* Definitions for handling #include specifications
*/
struct IFile {
char *fname; /* name of previous file */
int lineno; /* saved line number */
FILE *F; /* the open stream */
char *str; /* the string when parsing a string */
char *ptr; /* the current pointer when parsing a string */
TAILQ_ENTRY(IFile) link;/* stack the files */
};
/* stack of IFiles generated by * #includes */
static TAILQ_HEAD(, IFile) includes = TAILQ_HEAD_INITIALIZER(includes);
/* access current file */
#define CURFILE (TAILQ_FIRST(&includes))
/* list of directories for "..." includes */
struct Path parseIncPath = TAILQ_HEAD_INITIALIZER(parseIncPath);
/* list of directories for <...> includes */
struct Path sysIncPath = TAILQ_HEAD_INITIALIZER(sysIncPath);
/*
* specType contains the SPECial TYPE of the current target. It is
* Not if the target is unspecial. If it *is* special, however, the children
* are linked as children of the parent but not vice versa. This variable is
* set in ParseDoDependency
*/
typedef enum {
Begin, /* .BEGIN */
Default, /* .DEFAULT */
End, /* .END */
Ignore, /* .IGNORE */
Includes, /* .INCLUDES */
Interrupt, /* .INTERRUPT */
Libs, /* .LIBS */
MFlags, /* .MFLAGS or .MAKEFLAGS */
Main, /* .MAIN and we don't have anyth. user-spec. to make */
NoExport, /* .NOEXPORT */
Not, /* Not special */
NotParallel, /* .NOTPARALELL */
Null, /* .NULL */
Order, /* .ORDER */
Parallel, /* .PARALLEL */
ExPath, /* .PATH */
Phony, /* .PHONY */
Posix, /* .POSIX */
Precious, /* .PRECIOUS */
ExShell, /* .SHELL */
Silent, /* .SILENT */
SingleShell, /* .SINGLESHELL */
Suffixes, /* .SUFFIXES */
Wait, /* .WAIT */
Attribute /* Generic attribute */
} ParseSpecial;
static ParseSpecial specType;
static int waiting;
/*
* Predecessor node for handling .ORDER. Initialized to NULL when .ORDER
* seen, then set to each successive source on the line.
*/
static GNode *predecessor;
/*
* The parseKeywords table is searched using binary search when deciding
* if a target or source is special. The 'spec' field is the ParseSpecial
* type of the keyword ("Not" if the keyword isn't special as a target) while
* the 'op' field is the operator to apply to the list of targets if the
* keyword is used as a source ("0" if the keyword isn't special as a source)
*/
static struct {
const char *name; /* Name of keyword */
ParseSpecial spec; /* Type when used as a target */
int op; /* Operator when used as a source */
} parseKeywords[] = {
{ ".BEGIN", Begin, 0 },
{ ".DEFAULT", Default, 0 },
{ ".END", End, 0 },
{ ".EXEC", Attribute, OP_EXEC },
{ ".IGNORE", Ignore, OP_IGNORE },
{ ".INCLUDES", Includes, 0 },
{ ".INTERRUPT", Interrupt, 0 },
{ ".INVISIBLE", Attribute, OP_INVISIBLE },
{ ".JOIN", Attribute, OP_JOIN },
{ ".LIBS", Libs, 0 },
{ ".MAIN", Main, 0 },
{ ".MAKE", Attribute, OP_MAKE },
{ ".MAKEFLAGS", MFlags, 0 },
{ ".MFLAGS", MFlags, 0 },
{ ".NOTMAIN", Attribute, OP_NOTMAIN },
{ ".NOTPARALLEL", NotParallel, 0 },
{ ".NO_PARALLEL", NotParallel, 0 },
{ ".NULL", Null, 0 },
{ ".OPTIONAL", Attribute, OP_OPTIONAL },
{ ".ORDER", Order, 0 },
{ ".PARALLEL", Parallel, 0 },
{ ".PATH", ExPath, 0 },
{ ".PHONY", Phony, OP_PHONY },
{ ".POSIX", Posix, 0 },
{ ".PRECIOUS", Precious, OP_PRECIOUS },
{ ".RECURSIVE", Attribute, OP_MAKE },
{ ".SHELL", ExShell, 0 },
{ ".SILENT", Silent, OP_SILENT },
{ ".SINGLESHELL", SingleShell, 0 },
{ ".SUFFIXES", Suffixes, 0 },
{ ".USE", Attribute, OP_USE },
{ ".WAIT", Wait, 0 },
};
/*-
*----------------------------------------------------------------------
* ParseFindKeyword --
* Look in the table of keywords for one matching the given string.
*
* Results:
* The index of the keyword, or -1 if it isn't there.
*
* Side Effects:
* None
*----------------------------------------------------------------------
*/
static int
ParseFindKeyword(char *str)
{
int start;
int end;
int cur;
int diff;
start = 0;
end = (sizeof(parseKeywords) / sizeof(parseKeywords[0])) - 1;
do {
cur = start + (end - start) / 2;
diff = strcmp(str, parseKeywords[cur].name);
if (diff == 0) {
return (cur);
} else if (diff < 0) {
end = cur - 1;
} else {
start = cur + 1;
}
} while (start <= end);
return (-1);
}
/*-
* Parse_Error --
* Error message abort function for parsing. Prints out the context
* of the error (line number and file) as well as the message with
* two optional arguments.
*
* Results:
* None
*
* Side Effects:
* "fatals" is incremented if the level is PARSE_FATAL.
*/
/* VARARGS */
void
Parse_Error(int type, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "\"%s\", line %d: ", CURFILE->fname, CURFILE->lineno);
if (type == PARSE_WARNING)
fprintf(stderr, "warning: ");
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
fflush(stderr);
if (type == PARSE_FATAL)
fatals += 1;
}
/**
* ParsePushInput
*
* Push a new input source onto the input stack. If ptr is NULL
* the fullname is used to fopen the file. If it is not NULL,
* ptr is assumed to point to the string to be parsed. If opening the
* file fails, the fullname is freed.
*/
static void
ParsePushInput(char *fullname, FILE *fp, char *ptr, int lineno)
{
struct IFile *nf;
nf = emalloc(sizeof(*nf));
nf->fname = fullname;
nf->lineno = lineno;
if (ptr == NULL) {
/* the input source is a file */
if ((nf->F = fp) == NULL) {
nf->F = fopen(fullname, "r");
if (nf->F == NULL) {
Parse_Error(PARSE_FATAL, "Cannot open %s",
fullname);
free(fullname);
free(nf);
return;
}
}
nf->str = nf->ptr = NULL;
Var_Append(".MAKEFILE_LIST", fullname, VAR_GLOBAL);
} else {
nf->str = nf->ptr = ptr;
nf->F = NULL;
}
TAILQ_INSERT_HEAD(&includes, nf, link);
}
/**
* ParsePopInput
* Called when EOF is reached in the current file. If we were reading
* an include file, the includes stack is popped and things set up
* to go back to reading the previous file at the previous location.
*
* Results:
* CONTINUE if there's more to do. DONE if not.
*
* Side Effects:
* The old curFile.F is closed. The includes list is shortened.
* curFile.lineno, curFile.F, and curFile.fname are changed if
* CONTINUE is returned.
*/
static int
ParsePopInput(void)
{
struct IFile *ifile; /* the state on the top of the includes stack */
assert(!TAILQ_EMPTY(&includes));
ifile = TAILQ_FIRST(&includes);
TAILQ_REMOVE(&includes, ifile, link);
free(ifile->fname);
if (ifile->F != NULL) {
fclose(ifile->F);
Var_Append(".MAKEFILE_LIST", "..", VAR_GLOBAL);
}
if (ifile->str != NULL) {
free(ifile->str);
}
free(ifile);
return (TAILQ_EMPTY(&includes) ? DONE : CONTINUE);
}
/*-
*---------------------------------------------------------------------
* ParseLinkSrc --
* Link the parent nodes to their new child. Used by
* ParseDoDependency. If the specType isn't 'Not', the parent
* isn't linked as a parent of the child.
*
* Side Effects:
* New elements are added to the parents lists of cgn and the
* children list of cgn. the unmade field of pgn is updated
* to reflect the additional child.
*---------------------------------------------------------------------
*/
static void
ParseLinkSrc(Lst *parents, GNode *cgn)
{
LstNode *ln;
GNode *pgn;
LST_FOREACH(ln, parents) {
pgn = Lst_Datum(ln);
if (Lst_Member(&pgn->children, cgn) == NULL) {
Lst_AtEnd(&pgn->children, cgn);
if (specType == Not) {
Lst_AtEnd(&cgn->parents, pgn);
}
pgn->unmade += 1;
}
}
}
/*-
*---------------------------------------------------------------------
* ParseDoOp --
* Apply the parsed operator to all target nodes. Used in
* ParseDoDependency once all targets have been found and their
* operator parsed. If the previous and new operators are incompatible,
* a major error is taken.
*
* Side Effects:
* The type field of the node is altered to reflect any new bits in
* the op.
*---------------------------------------------------------------------
*/
static void
ParseDoOp(int op)
{
GNode *cohort;
LstNode *ln;
GNode *gn;
LST_FOREACH(ln, &targets) {
gn = Lst_Datum(ln);
/*
* If the dependency mask of the operator and the node don't
* match and the node has actually had an operator applied to
* it before, and the operator actually has some dependency
* information in it, complain.
*/
if ((op & OP_OPMASK) != (gn->type & OP_OPMASK) &&
!OP_NOP(gn->type) && !OP_NOP(op)) {
Parse_Error(PARSE_FATAL, "Inconsistent operator for %s",
gn->name);
return;
}
if (op == OP_DOUBLEDEP &&
(gn->type & OP_OPMASK) == OP_DOUBLEDEP) {
/*
* If the node was the object of a :: operator, we need
* to create a new instance of it for the children and
* commands on this dependency line. The new instance
* is placed on the 'cohorts' list of the initial one
* (note the initial one is not on its own cohorts list)
* and the new instance is linked to all parents of the
* initial instance.
*/
cohort = Targ_NewGN(gn->name);
/*
* Duplicate links to parents so graph traversal is
* simple. Perhaps some type bits should be duplicated?
*
* Make the cohort invisible as well to avoid
* duplicating it into other variables. True, parents
* of this target won't tend to do anything with their
* local variables, but better safe than sorry.
*/
ParseLinkSrc(&gn->parents, cohort);
cohort->type = OP_DOUBLEDEP|OP_INVISIBLE;
Lst_AtEnd(&gn->cohorts, cohort);
/*
* Replace the node in the targets list with the
* new copy
*/
Lst_Replace(ln, cohort);
gn = cohort;
}
/*
* We don't want to nuke any previous flags (whatever they were)
* so we just OR the new operator into the old
*/
gn->type |= op;
}
}
/*-
*---------------------------------------------------------------------
* ParseDoSrc --
* Given the name of a source, figure out if it is an attribute
* and apply it to the targets if it is. Else decide if there is
* some attribute which should be applied *to* the source because
* of some special target and apply it if so. Otherwise, make the
* source be a child of the targets in the list 'targets'
*
* Results:
* None
*
* Side Effects:
* Operator bits may be added to the list of targets or to the source.
* The targets may have a new source added to their lists of children.
*---------------------------------------------------------------------
*/
static void
ParseDoSrc(int tOp, char *src, Lst *allsrc)
{
GNode *gn = NULL;
if (*src == '.' && isupper ((unsigned char) src[1])) {
int keywd = ParseFindKeyword(src);
if (keywd != -1) {
if(parseKeywords[keywd].op != 0) {
ParseDoOp(parseKeywords[keywd].op);
return;
}
if (parseKeywords[keywd].spec == Wait) {
waiting++;
return;
}
}
}
switch (specType) {
case Main:
/*
* If we have noted the existence of a .MAIN, it means we need
* to add the sources of said target to the list of things
* to create. The string 'src' is likely to be free, so we
* must make a new copy of it. Note that this will only be
* invoked if the user didn't specify a target on the command
* line. This is to allow #ifmake's to succeed, or something...
*/
Lst_AtEnd(&create, estrdup(src));
/*
* Add the name to the .TARGETS variable as well, so the user
* can employ that, if desired.
*/
Var_Append(".TARGETS", src, VAR_GLOBAL);
return;
case Order:
/*
* Create proper predecessor/successor links between the
* previous source and the current one.
*/
gn = Targ_FindNode(src, TARG_CREATE);
if (predecessor != NULL) {
Lst_AtEnd(&predecessor->successors, gn);
Lst_AtEnd(&gn->preds, predecessor);
}
/*
* The current source now becomes the predecessor for the next
* one.
*/
predecessor = gn;
break;
default:
/*
* If the source is not an attribute, we need to find/create
* a node for it. After that we can apply any operator to it
* from a special target or link it to its parents, as
* appropriate.
*
* In the case of a source that was the object of a :: operator,
* the attribute is applied to all of its instances (as kept in
* the 'cohorts' list of the node) or all the cohorts are linked
* to all the targets.
*/
gn = Targ_FindNode(src, TARG_CREATE);
if (tOp) {
gn->type |= tOp;
} else {
ParseLinkSrc(&targets, gn);
}
if ((gn->type & OP_OPMASK) == OP_DOUBLEDEP) {
GNode *cohort;
LstNode *ln;
for (ln = Lst_First(&gn->cohorts); ln != NULL;
ln = Lst_Succ(ln)) {
cohort = Lst_Datum(ln);
if (tOp) {
cohort->type |= tOp;
} else {
ParseLinkSrc(&targets, cohort);
}
}
}
break;
}
gn->order = waiting;
Lst_AtEnd(allsrc, gn);
if (waiting) {
LstNode *ln;
GNode *p;
/*
* Check if GNodes needs to be synchronized.
* This has to be when two nodes are on different sides of a
* .WAIT directive.
*/
LST_FOREACH(ln, allsrc) {
p = Lst_Datum(ln);
if (p->order >= gn->order)
break;
/*
* XXX: This can cause loops, and loops can cause
* unmade targets, but checking is tedious, and the
* debugging output can show the problem
*/
Lst_AtEnd(&p->successors, gn);
Lst_AtEnd(&gn->preds, p);
}
}
}
/*-
*---------------------------------------------------------------------
* ParseDoDependency --
* Parse the dependency line in line.
*
* Results:
* None
*
* Side Effects:
* The nodes of the sources are linked as children to the nodes of the
* targets. Some nodes may be created.
*
* We parse a dependency line by first extracting words from the line and
* finding nodes in the list of all targets with that name. This is done
* until a character is encountered which is an operator character. Currently
* these are only ! and :. At this point the operator is parsed and the
* pointer into the line advanced until the first source is encountered.
* The parsed operator is applied to each node in the 'targets' list,
* which is where the nodes found for the targets are kept, by means of
* the ParseDoOp function.
* The sources are read in much the same way as the targets were except
* that now they are expanded using the wildcarding scheme of the C-Shell
* and all instances of the resulting words in the list of all targets
* are found. Each of the resulting nodes is then linked to each of the
* targets as one of its children.
* Certain targets are handled specially. These are the ones detailed
* by the specType variable.
* The storing of transformation rules is also taken care of here.
* A target is recognized as a transformation rule by calling
* Suff_IsTransform. If it is a transformation rule, its node is gotten
* from the suffix module via Suff_AddTransform rather than the standard
* Targ_FindNode in the target module.
*---------------------------------------------------------------------
*/
static void
ParseDoDependency(char *line)
{
char *cp; /* our current position */
GNode *gn; /* a general purpose temporary node */
int op; /* the operator on the line */
char savec; /* a place to save a character */
Lst paths; /* Search paths to alter when parsing .PATH targets */
int tOp; /* operator from special target */
LstNode *ln;
tOp = 0;
specType = Not;
waiting = 0;
Lst_Init(&paths);
do {
for (cp = line;
*cp && !isspace((unsigned char)*cp) && *cp != '(';
cp++) {
if (*cp == '$') {
/*
* Must be a dynamic source (would have been
* expanded otherwise), so call the Var module
* to parse the puppy so we can safely advance
* beyond it...There should be no errors in this
* as they would have been discovered in the
* initial Var_Subst and we wouldn't be here.
*/
size_t length = 0;
Boolean freeIt;
char *result;
result = Var_Parse(cp, VAR_CMD, TRUE,
&length, &freeIt);
if (freeIt) {
free(result);
}
cp += length - 1;
} else if (*cp == '!' || *cp == ':') {
/*
* We don't want to end a word on ':' or '!' if
* there is a better match later on in the
* string (greedy matching).
* This allows the user to have targets like:
* fie::fi:fo: fum
* foo::bar:
* where "fie::fi:fo" and "foo::bar" are the
* targets. In real life this is used for perl5
* library man pages where "::" separates an
* object from its class. Ie:
* "File::Spec::Unix". This behaviour is also
* consistent with other versions of make.
*/
char *p = cp + 1;
if (*cp == ':' && *p == ':')
p++;
/* Found the best match already. */
if (*p == '\0' || isspace(*p))
break;
p += strcspn(p, "!:");
/* No better match later on... */
if (*p == '\0')
break;
}
continue;
}
if (*cp == '(') {
/*
* Archives must be handled specially to make sure the
* OP_ARCHV flag is set in their 'type' field, for one
* thing, and because things like "archive(file1.o
* file2.o file3.o)" are permissible. Arch_ParseArchive
* will set 'line' to be the first non-blank after the
* archive-spec. It creates/finds nodes for the members
* and places them on the given list, returning SUCCESS
* if all went well and FAILURE if there was an error in
* the specification. On error, line should remain
* untouched.
*/
if (Arch_ParseArchive(&line, &targets, VAR_CMD) !=
SUCCESS) {
Parse_Error(PARSE_FATAL,
"Error in archive specification: \"%s\"",
line);
return;
} else {
cp = line;
continue;
}
}
savec = *cp;
if (!*cp) {
/*
* Ending a dependency line without an operator is a * Bozo no-no. As a heuristic, this is also often
* triggered by undetected conflicts from cvs/rcs
* merges.
*/
if (strncmp(line, "<<<<<<", 6) == 0 ||
strncmp(line, "======", 6) == 0 ||
strncmp(line, ">>>>>>", 6) == 0) {
Parse_Error(PARSE_FATAL, "Makefile appears to "
"contain unresolved cvs/rcs/??? merge "
"conflicts");
} else
Parse_Error(PARSE_FATAL, "Need an operator");
return;
}
*cp = '\0';
/*
* Have a word in line. See if it's a special target and set
* specType to match it.
*/
if (*line == '.' && isupper((unsigned char)line[1])) {
/*
* See if the target is a special target that must have
* it or its sources handled specially.
*/
int keywd = ParseFindKeyword(line);
if (keywd != -1) {
if (specType == ExPath &&
parseKeywords[keywd].spec != ExPath) {
Parse_Error(PARSE_FATAL,
"Mismatched special targets");
return;
}
specType = parseKeywords[keywd].spec;
tOp = parseKeywords[keywd].op;
/*
* Certain special targets have special
* semantics:
* .PATH Have to set the dirSearchPath
* variable too
* .MAIN Its sources are only used if
* nothing has been specified to
* create.
* .DEFAULT Need to create a node to hang
* commands on, but we don't want
* it in the graph, nor do we want
* it to be the Main Target, so we
* create it, set OP_NOTMAIN and
* add it to the list, setting
* DEFAULT to the new node for
* later use. We claim the node is
* A transformation rule to make
* life easier later, when we'll
* use Make_HandleUse to actually
* apply the .DEFAULT commands.
* .PHONY The list of targets
* .BEGIN
* .END
* .INTERRUPT Are not to be considered the
* main target.
* .NOTPARALLEL Make only one target at a time.
* .SINGLESHELL Create a shell for each
* command.
* .ORDER Must set initial predecessor
* to NULL
*/
switch (specType) {
case ExPath:
Lst_AtEnd(&paths, &dirSearchPath);
break;
case Main:
if (!Lst_IsEmpty(&create)) {
specType = Not;
}
break;
case Begin:
case End:
case Interrupt:
gn = Targ_FindNode(line, TARG_CREATE);
gn->type |= OP_NOTMAIN;
Lst_AtEnd(&targets, gn);
break;
case Default:
gn = Targ_NewGN(".DEFAULT");
gn->type |= (OP_NOTMAIN|OP_TRANSFORM);
Lst_AtEnd(&targets, gn);
DEFAULT = gn;
break;
case NotParallel:
maxJobs = 1;
break;
case SingleShell:
compatMake = 1;
break;
case Order:
predecessor = NULL;
break;
default:
break;
}
} else if (strncmp(line, ".PATH", 5) == 0) {
/*
* .PATH<suffix> has to be handled specially.
* Call on the suffix module to give us a path
* to modify.
*/
struct Path *path;
specType = ExPath;
path = Suff_GetPath(&line[5]);
if (path == NULL) {
Parse_Error(PARSE_FATAL, "Suffix '%s' "
"not defined (yet)", &line[5]);
return;
} else
Lst_AtEnd(&paths, path);
}
}
/*
* Have word in line. Get or create its node and stick it at
* the end of the targets list
*/
if (specType == Not && *line != '\0') {
/* target names to be found and added to targets list */
Lst curTargs = Lst_Initializer(curTargs);
if (Dir_HasWildcards(line)) {
/*
* Targets are to be sought only in the current
* directory, so create an empty path for the
* thing. Note we need to use Path_Clear in the
* destruction of the path as the Dir module
* could have added a directory to the path...
*/
struct Path emptyPath =
TAILQ_HEAD_INITIALIZER(emptyPath);
Path_Expand(line, &emptyPath, &curTargs);
Path_Clear(&emptyPath);
} else {
/*
* No wildcards, but we want to avoid code
* duplication, so create a list with the word
* on it.
*/
Lst_AtEnd(&curTargs, line);
}
while (!Lst_IsEmpty(&curTargs)) {
char *targName = Lst_DeQueue(&curTargs);
if (!Suff_IsTransform (targName)) {
gn = Targ_FindNode(targName,
TARG_CREATE);
} else {
gn = Suff_AddTransform(targName);
}
Lst_AtEnd(&targets, gn);
}
} else if (specType == ExPath && *line != '.' && *line != '\0'){
Parse_Error(PARSE_WARNING, "Extra target (%s) ignored",
line);
}
*cp = savec;
/*
* If it is a special type and not .PATH, it's the only
* target we allow on this line...
*/
if (specType != Not && specType != ExPath) {
Boolean warnFlag = FALSE;
while (*cp != '!' && *cp != ':' && *cp) {
if (*cp != ' ' && *cp != '\t') {
warnFlag = TRUE;
}
cp++;
}
if (warnFlag) {
Parse_Error(PARSE_WARNING,
"Extra target ignored");
}
} else {
while (*cp && isspace((unsigned char)*cp)) {
cp++;
}
}
line = cp;
} while (*line != '!' && *line != ':' && *line);
if (!Lst_IsEmpty(&targets)) {
switch (specType) {
default:
Parse_Error(PARSE_WARNING, "Special and mundane "
"targets don't mix. Mundane ones ignored");
break;
case Default:
case Begin:
case End:
case Interrupt:
/*
* These four create nodes on which to hang commands, so
* targets shouldn't be empty...
*/
case Not:
/*
* Nothing special here -- targets can be empty if it
* wants.
*/
break;
}
}
/*
* Have now parsed all the target names. Must parse the operator next.
* The result is left in op.
*/
if (*cp == '!') {
op = OP_FORCE;
} else if (*cp == ':') {
if (cp[1] == ':') {
op = OP_DOUBLEDEP;
cp++;
} else {
op = OP_DEPENDS;
}
} else {
Parse_Error(PARSE_FATAL, "Missing dependency operator");
return;
}
cp++; /* Advance beyond operator */
ParseDoOp(op);
/*
* Get to the first source
*/
while (*cp && isspace((unsigned char)*cp)) {
cp++;
}
line = cp;
/*
* Several special targets take different actions if present with no
* sources:
* a .SUFFIXES line with no sources clears out all old suffixes
* a .PRECIOUS line makes all targets precious
* a .IGNORE line ignores errors for all targets
* a .SILENT line creates silence when making all targets
* a .PATH removes all directories from the search path(s).
*/
if (!*line) {
switch (specType) {
case Suffixes:
Suff_ClearSuffixes();
break;
case Precious:
allPrecious = TRUE;
break;
case Ignore:
ignoreErrors = TRUE;
break;
case Silent:
beSilent = TRUE;
break;
case ExPath:
LST_FOREACH(ln, &paths)
Path_Clear(Lst_Datum(ln));
break;
case Posix:
Var_Set("%POSIX", "1003.2", VAR_GLOBAL);
break;
default:
break;
}
} else if (specType == MFlags) {
/*
* Call on functions in main.c to deal with these arguments and
* set the initial character to a null-character so the loop to
* get sources won't get anything
*/
Main_ParseArgLine(line, 0);
*line = '\0';
} else if (specType == ExShell) {
if (Job_ParseShell(line) != SUCCESS) {
Parse_Error(PARSE_FATAL,
"improper shell specification");
return;
}
*line = '\0';
} else if (specType == NotParallel || specType == SingleShell) {
*line = '\0';
}
/*
* NOW GO FOR THE SOURCES
*/
if (specType == Suffixes || specType == ExPath ||
specType == Includes || specType == Libs ||
specType == Null) {
while (*line) {
/*
* If the target was one that doesn't take files as its
* sources but takes something like suffixes, we take
* each space-separated word on the line as a something
* and deal with it accordingly.
*
* If the target was .SUFFIXES, we take each source as
* a suffix and add it to the list of suffixes
* maintained by the Suff module.
*
* If the target was a .PATH, we add the source as a
* directory to search on the search path.
*
* If it was .INCLUDES, the source is taken to be the
* suffix of files which will be #included and whose
* search path should be present in the .INCLUDES
* variable.
*
* If it was .LIBS, the source is taken to be the
* suffix of files which are considered libraries and
* whose search path should be present in the .LIBS
* variable.
*
* If it was .NULL, the source is the suffix to use
* when a file has no valid suffix.
*/
char savech;
while (*cp && !isspace((unsigned char)*cp)) {
cp++;
}
savech = *cp;
*cp = '\0';
switch (specType) {
case Suffixes:
Suff_AddSuffix(line);
break;
case ExPath:
LST_FOREACH(ln, &paths)
Path_AddDir(Lst_Datum(ln), line);
break;
case Includes:
Suff_AddInclude(line);
break;
case Libs:
Suff_AddLib(line);
break;
case Null:
Suff_SetNull(line);
break;
default:
break;
}
*cp = savech;
if (savech != '\0') {
cp++;
}
while (*cp && isspace((unsigned char)*cp)) {
cp++;
}
line = cp;
}
Lst_Destroy(&paths, NOFREE);
} else {
/* list of sources in order */
Lst curSrcs = Lst_Initializer(curSrc);
while (*line) {
/*
* The targets take real sources, so we must beware of
* archive specifications (i.e. things with left
* parentheses in them) and handle them accordingly.
*/
while (*cp && !isspace((unsigned char)*cp)) {
if (*cp == '(' && cp > line && cp[-1] != '$') {
/*
* Only stop for a left parenthesis if
* it isn't at the start of a word
* (that'll be for variable changes
* later) and isn't preceded by a dollar
* sign (a dynamic source).
*/
break;
} else {
cp++;
}
}
if (*cp == '(') {
GNode *gnp;
/* list of archive source names after exp. */
Lst sources = Lst_Initializer(sources);
if (Arch_ParseArchive(&line, &sources,
VAR_CMD) != SUCCESS) {
Parse_Error(PARSE_FATAL, "Error in "
"source archive spec \"%s\"", line);
return;
}
while (!Lst_IsEmpty(&sources)) {
gnp = Lst_DeQueue(&sources);
ParseDoSrc(tOp, gnp->name, &curSrcs);
}
cp = line;
} else {
if (*cp) {
*cp = '\0';
cp += 1;
}
ParseDoSrc(tOp, line, &curSrcs);
}
while (*cp && isspace((unsigned char)*cp)) {
cp++;
}
line = cp;
}
Lst_Destroy(&curSrcs, NOFREE);
}
if (mainNode == NULL) {
/*
* If we have yet to decide on a main target to make, in the
* absence of any user input, we want the first target on
* the first dependency line that is actually a real target
* (i.e. isn't a .USE or .EXEC rule) to be made.
*/
LST_FOREACH(ln, &targets) {
gn = Lst_Datum(ln);
if ((gn->type & (OP_NOTMAIN | OP_USE |
OP_EXEC | OP_TRANSFORM)) == 0) {
mainNode = gn;
Targ_SetMain(gn);
break;
}
}
}
}
/*-
*---------------------------------------------------------------------
* Parse_IsVar --
* Return TRUE if the passed line is a variable assignment. A variable
* assignment consists of a single word followed by optional whitespace
* followed by either a += or an = operator.
* This function is used both by the Parse_File function and main when
* parsing the command-line arguments.
*
* Results:
* TRUE if it is. FALSE if it ain't
*
* Side Effects:
* none
*---------------------------------------------------------------------
*/
Boolean
Parse_IsVar(char *line)
{
Boolean wasSpace = FALSE; /* set TRUE if found a space */
Boolean haveName = FALSE; /* Set TRUE if have a variable name */
int level = 0;
#define ISEQOPERATOR(c) \
((c) == '+' || (c) == ':' || (c) == '?' || (c) == '!')
/*
* Skip to variable name
*/
for (; *line == ' ' || *line == '\t'; line++)
continue;
for (; *line != '=' || level != 0; line++) {
switch (*line) {
case '\0':
/*
* end-of-line -- can't be a variable assignment.
*/
return (FALSE);
case ' ':
case '\t':
/*
* there can be as much white space as desired so long
* as there is only one word before the operator
*/
wasSpace = TRUE;
break;
case '(':
case '{':
level++;
break;
case '}':
case ')':
level--;
break;
default:
if (wasSpace && haveName) {
if (ISEQOPERATOR(*line)) {
/*
* We must have a finished word
*/
if (level != 0)
return (FALSE);
/*
* When an = operator [+?!:] is found,
* the next character must be an = or
* it ain't a valid assignment.
*/
if (line[1] == '=')
return (haveName);
#ifdef SUNSHCMD
/*
* This is a shell command
*/
if (strncmp(line, ":sh", 3) == 0)
return (haveName);
#endif
}
/*
* This is the start of another word, so not
* assignment.
*/
return (FALSE);
} else {
haveName = TRUE;
wasSpace = FALSE;
}
break;
}
}
return (haveName);
}
/*-
*---------------------------------------------------------------------
* Parse_DoVar --
* Take the variable assignment in the passed line and do it in the
* global context.
*
* Note: There is a lexical ambiguity with assignment modifier characters
* in variable names. This routine interprets the character before the =
* as a modifier. Therefore, an assignment like
* C++=/usr/bin/CC
* is interpreted as "C+ +=" instead of "C++ =".
*
* Results:
* none
*
* Side Effects:
* the variable structure of the given variable name is altered in the
* global context.
*---------------------------------------------------------------------
*/
void
Parse_DoVar(char *line, GNode *ctxt)
{
char *cp; /* pointer into line */
enum {
VAR_SUBST,
VAR_APPEND,
VAR_SHELL,
VAR_NORMAL
} type; /* Type of assignment */
char *opc; /* ptr to operator character to
* null-terminate the variable name */
/*
* Avoid clobbered variable warnings by forcing the compiler
* to ``unregister'' variables
*/
#if __GNUC__
(void)&cp;
(void)&line;
#endif
/*
* Skip to variable name
*/
while (*line == ' ' || *line == '\t') {
line++;
}
/*
* Skip to operator character, nulling out whitespace as we go
*/
for (cp = line + 1; *cp != '='; cp++) {
if (isspace((unsigned char)*cp)) {
*cp = '\0';
}
}
opc = cp - 1; /* operator is the previous character */
*cp++ = '\0'; /* nuke the = */
/*
* Check operator type
*/
switch (*opc) {
case '+':
type = VAR_APPEND;
*opc = '\0';
break;
case '?':
/*
* If the variable already has a value, we don't do anything.
*/
*opc = '\0';
if (Var_Exists(line, ctxt)) {
return;
} else {
type = VAR_NORMAL;
}
break;
case ':':
type = VAR_SUBST;
*opc = '\0';
break;
case '!':
type = VAR_SHELL;
*opc = '\0';
break;
default:
#ifdef SUNSHCMD
while (*opc != ':') {
if (opc == line)
break;
else
--opc;
}
if (strncmp(opc, ":sh", 3) == 0) {
type = VAR_SHELL;
*opc = '\0';
break;
}
#endif
type = VAR_NORMAL;
break;
}
while (isspace((unsigned char)*cp)) {
cp++;
}
if (type == VAR_APPEND) {
Var_Append(line, cp, ctxt);
} else if (type == VAR_SUBST) {
/*
* Allow variables in the old value to be undefined, but leave
* their invocation alone -- this is done by forcing oldVars
* to be false.
* XXX: This can cause recursive variables, but that's not
* hard to do, and this allows someone to do something like
*
* CFLAGS = $(.INCLUDES)
* CFLAGS := -I.. $(CFLAGS)
*
* And not get an error.
*/
Boolean oldOldVars = oldVars;
oldVars = FALSE;
/*
* make sure that we set the variable the first time to nothing
* so that it gets substituted!
*/
if (!Var_Exists(line, ctxt))
Var_Set(line, "", ctxt);
cp = Buf_Peel(Var_Subst(NULL, cp, ctxt, FALSE));
oldVars = oldOldVars;
Var_Set(line, cp, ctxt);
free(cp);
} else if (type == VAR_SHELL) {
/*
* TRUE if the command needs to be freed, i.e.
* if any variable expansion was performed
*/
Boolean freeCmd = FALSE;
Buffer *buf;
const char *error;
if (strchr(cp, '$') != NULL) {
/*
* There's a dollar sign in the command, so perform
* variable expansion on the whole thing. The
* resulting string will need freeing when we're done,
* so set freeCmd to TRUE.
*/
cp = Buf_Peel(Var_Subst(NULL, cp, VAR_CMD, TRUE));
freeCmd = TRUE;
}
buf = Cmd_Exec(cp, &error);
Var_Set(line, Buf_Data(buf), ctxt);
Buf_Destroy(buf, TRUE);
if (error)
Parse_Error(PARSE_WARNING, error, cp);
if (freeCmd)
free(cp);
} else {
/*
* Normal assignment -- just do it.
*/
Var_Set(line, cp, ctxt);
}
}
/*-
*-----------------------------------------------------------------------
* ParseHasCommands --
* Callback procedure for Parse_File when destroying the list of
* targets on the last dependency line. Marks a target as already
* having commands if it does, to keep from having shell commands
* on multiple dependency lines.
*
* Results:
* None
*
* Side Effects:
* OP_HAS_COMMANDS may be set for the target.
*
*-----------------------------------------------------------------------
*/
static void
ParseHasCommands(void *gnp)
{
GNode *gn = gnp;
if (!Lst_IsEmpty(&gn->commands)) {
gn->type |= OP_HAS_COMMANDS;
}
}
/*-
*-----------------------------------------------------------------------
* Parse_AddIncludeDir --
* Add a directory to the path searched for included makefiles
* bracketed by double-quotes. Used by functions in main.c
*
* Results:
* None.
*
* Side Effects:
* The directory is appended to the list.
*
*-----------------------------------------------------------------------
*/
void
Parse_AddIncludeDir(char *dir)
{
Path_AddDir(&parseIncPath, dir);
}
/*---------------------------------------------------------------------
* ParseDoError --
* Handle error directive
*
* The input is the line minus the ".error". We substitute variables,
* print the message and exit(1) or just print a warning if the ".error"
* directive is malformed.
*
*---------------------------------------------------------------------
*/
static void
ParseDoError(char *errmsg)
{
Buffer *buf;
if (!isspace((unsigned char)*errmsg)) {
Parse_Error(PARSE_WARNING, "invalid syntax: .error%s", errmsg);
return;
}
while (isspace((unsigned char)*errmsg))
errmsg++;
buf = Var_Subst(NULL, errmsg, VAR_GLOBAL, FALSE);
Parse_Error(PARSE_FATAL, "%s", Buf_Data(buf));
Buf_Destroy(buf, TRUE);
/* Terminate immediately. */
exit(1);
}
/*---------------------------------------------------------------------
* ParseDoWarning --
* Handle warning directive
*
* The input is the line minus the ".warning". We substitute variables
* and print the message or just print a warning if the ".warning"
* directive is malformed.
*
*---------------------------------------------------------------------
*/
static void
ParseDoWarning(char *warnmsg)
{
Buffer *buf;
if (!isspace((unsigned char)*warnmsg)) {
Parse_Error(PARSE_WARNING, "invalid syntax: .warning%s",
warnmsg);
return;
}
while (isspace((unsigned char)*warnmsg))
warnmsg++;
buf = Var_Subst(NULL, warnmsg, VAR_GLOBAL, FALSE);
Parse_Error(PARSE_WARNING, "%s", Buf_Data(buf));
Buf_Destroy(buf, TRUE);
}
/*-
*---------------------------------------------------------------------
* ParseDoInclude --
* Push to another file.
*
* The input is the line minus the #include. A file spec is a string
* enclosed in <> or "". The former is looked for only in sysIncPath.
* The latter in . and the directories specified by -I command line
* options
*
* Results:
* None
*
* Side Effects:
* A structure is added to the includes Lst and readProc.
*---------------------------------------------------------------------
*/
static void
ParseDoInclude(char *file)
{
char *fullname; /* full pathname of file */
char endc; /* the character which ends the file spec */
char *cp; /* current position in file spec */
Boolean isSystem; /* TRUE if makefile is a system makefile */
Buffer *buf;
/*
* Skip to delimiter character so we know where to look
*/
while (*file == ' ' || *file == '\t') {
file++;
}
if (*file != '"' && *file != '<') {
Parse_Error(PARSE_FATAL,
".include filename must be delimited by '\"' or '<'");
return;
}
/*
* Set the search path on which to find the include file based on the
* characters which bracket its name. Angle-brackets imply it's
* a system Makefile while double-quotes imply it's a user makefile
*/
if (*file == '<') {
isSystem = TRUE;
endc = '>';
} else {
isSystem = FALSE;
endc = '"';
}
/*
* Skip to matching delimiter
*/
for (cp = ++file; *cp && *cp != endc; cp++) {
continue;
}
if (*cp != endc) {
Parse_Error(PARSE_FATAL,
"Unclosed %cinclude filename. '%c' expected", '.', endc);
return;
}
*cp = '\0';
/*
* Substitute for any variables in the file name before trying to
* find the thing.
*/
buf = Var_Subst(NULL, file, VAR_CMD, FALSE);
file = Buf_Peel(buf);
/*
* Now we know the file's name and its search path, we attempt to
* find the durn thing. A return of NULL indicates the file don't
* exist.
*/
if (!isSystem) {
/*
* Include files contained in double-quotes are first searched
* for relative to the including file's location. We don't want
* to cd there, of course, so we just tack on the old file's
* leading path components and call Dir_FindFile to see if
* we can locate the beast.
*/
char *prefEnd, *Fname;
/* Make a temporary copy of this, to be safe. */
Fname = estrdup(CURFILE->fname);
prefEnd = strrchr(Fname, '/');
if (prefEnd != (char *)NULL) {
char *newName;
*prefEnd = '\0';
if (file[0] == '/')
newName = estrdup(file);
else
newName = str_concat(Fname, file, STR_ADDSLASH);
fullname = Path_FindFile(newName, &parseIncPath);
if (fullname == NULL) {
fullname = Path_FindFile(newName,
&dirSearchPath);
}
free(newName);
*prefEnd = '/';
} else {
fullname = NULL;
}
free(Fname);
} else {
fullname = NULL;
}
if (fullname == NULL) {
/*
* System makefile or makefile wasn't found in same directory as
* included makefile. Search for it first on the -I search path,
* then on the .PATH search path, if not found in a -I
* directory.
* XXX: Suffix specific?
*/
fullname = Path_FindFile(file, &parseIncPath);
if (fullname == NULL) {
fullname = Path_FindFile(file, &dirSearchPath);
}
}
if (fullname == NULL) {
/*
* Still haven't found the makefile. Look for it on the system
* path as a last resort.
*/
fullname = Path_FindFile(file, &sysIncPath);
}
if (fullname == NULL) {
*cp = endc;
Parse_Error(PARSE_FATAL, "Could not find %s", file);
/* XXXHB free(file) */
return;
}
free(file);
/*
* We set up the name of the file to be the absolute
* name of the include file so error messages refer to the right
* place.
*/
ParsePushInput(fullname, NULL, NULL, 0);
}
/*-
*---------------------------------------------------------------------
* Parse_FromString --
* Start Parsing from the given string
*
* Results:
* None
*
* Side Effects:
* A structure is added to the includes Lst and readProc, curFile.lineno,
* curFile.fname and curFile.F are altered for the new file
*---------------------------------------------------------------------
*/
void
Parse_FromString(char *str, int lineno)
{
DEBUGF(FOR, ("%s\n---- at line %d\n", str, lineno));
ParsePushInput(estrdup(CURFILE->fname), NULL, str, lineno);
}
#ifdef SYSVINCLUDE
/*-
*---------------------------------------------------------------------
* ParseTraditionalInclude --
* Push to another file.
*
* The input is the line minus the "include". The file name is
* the string following the "include".
*
* Results:
* None
*
* Side Effects:
* A structure is added to the includes Lst and readProc, curFile.lineno,
* curFile.fname and curFile.F are altered for the new file
*---------------------------------------------------------------------
*/
static void
ParseTraditionalInclude(char *file)
{
char *fullname; /* full pathname of file */
char *cp; /* current position in file spec */
Buffer *buf;
/*
* Skip over whitespace
*/
while (*file == ' ' || *file == '\t') {
file++;
}
if (*file == '\0') {
Parse_Error(PARSE_FATAL, "Filename missing from \"include\"");
return;
}
/*
* Skip to end of line or next whitespace
*/
for (cp = file; *cp && *cp != '\n' && *cp != '\t' && *cp != ' '; cp++) {
continue;
}
*cp = '\0';
/*
* Substitute for any variables in the file name before trying to
* find the thing.
*/
buf = Var_Subst(NULL, file, VAR_CMD, FALSE);
file = Buf_Peel(buf);
/*
* Now we know the file's name, we attempt to find the durn thing.
* Search for it first on the -I search path, then on the .PATH
* search path, if not found in a -I directory.
*/
fullname = Path_FindFile(file, &parseIncPath);
if (fullname == NULL) {
fullname = Path_FindFile(file, &dirSearchPath);
}
if (fullname == NULL) {
/*
* Still haven't found the makefile. Look for it on the system
* path as a last resort.
*/
fullname = Path_FindFile(file, &sysIncPath);
}
if (fullname == NULL) {
Parse_Error(PARSE_FATAL, "Could not find %s", file);
/* XXXHB free(file) */
return;
}
/* XXXHB free(file) */
/*
* We set up the name of the file to be the absolute
* name of the include file so error messages refer to the right
* place.
*/
ParsePushInput(fullname, NULL, NULL, 0);
}
#endif
/*-
*---------------------------------------------------------------------
* ParseReadc --
* Read a character from the current file
*
* Results:
* The character that was read
*
* Side Effects:
*---------------------------------------------------------------------
*/
static int
ParseReadc(void)
{
if (CURFILE->F != NULL)
return (fgetc(CURFILE->F));
if (CURFILE->str != NULL && *CURFILE->ptr != '\0')
return (*CURFILE->ptr++);
return (EOF);
}
/*-
*---------------------------------------------------------------------
* ParseUnreadc --
* Put back a character to the current file
*
* Results:
* None.
*
* Side Effects:
*---------------------------------------------------------------------
*/
static void
ParseUnreadc(int c)
{
if (CURFILE->F != NULL) {
ungetc(c, CURFILE->F);
return;
}
if (CURFILE->str != NULL) {
*--(CURFILE->ptr) = c;
return;
}
}
/* ParseSkipLine():
* Grab the next line unless it begins with a dot (`.') and we're told to
* ignore such lines.
*/
static char *
ParseSkipLine(int skip, int keep_newline)
{
char *line;
int c, lastc;
Buffer *buf;
buf = Buf_Init(MAKE_BSIZE);
do {
Buf_Clear(buf);
lastc = '\0';
while (((c = ParseReadc()) != '\n' || lastc == '\\')
&& c != EOF) {
if (skip && c == '#' && lastc != '\\') {
/*
* let a comment be terminated even by an
* escaped \n. This is consistent to comment
* handling in ParseReadLine
*/
while ((c = ParseReadc()) != '\n' && c != EOF)
;
break;
}
if (c == '\n') {
if (keep_newline)
Buf_AddByte(buf, (Byte)c);
else
Buf_ReplaceLastByte(buf, (Byte)' ');
CURFILE->lineno++;
while ((c = ParseReadc()) == ' ' || c == '\t')
continue;
if (c == EOF)
break;
}
Buf_AddByte(buf, (Byte)c);
lastc = c;
}
if (c == EOF) {
Parse_Error(PARSE_FATAL,
"Unclosed conditional/for loop");
Buf_Destroy(buf, TRUE);
return (NULL);
}
CURFILE->lineno++;
Buf_AddByte(buf, (Byte)'\0');
line = Buf_Data(buf);
} while (skip == 1 && line[0] != '.');
Buf_Destroy(buf, FALSE);
return (line);
}
/*-
*---------------------------------------------------------------------
* ParseReadLine --
* Read an entire line from the input file. Called only by Parse_File.
* To facilitate escaped newlines and what have you, a character is
* buffered in 'lastc', which is '\0' when no characters have been
* read. When we break out of the loop, c holds the terminating
* character and lastc holds a character that should be added to
* the line (unless we don't read anything but a terminator).
*
* Results:
* A line w/o its newline
*
* Side Effects:
* Only those associated with reading a character
*---------------------------------------------------------------------
*/
static char *
ParseReadLine(void)
{
Buffer *buf; /* Buffer for current line */
int c; /* the current character */
int lastc; /* The most-recent character */
Boolean semiNL; /* treat semi-colons as newlines */
Boolean ignDepOp; /* TRUE if should ignore dependency operators
* for the purposes of setting semiNL */
Boolean ignComment; /* TRUE if should ignore comments (in a
* shell command */
char *line; /* Result */
char *ep; /* to strip trailing blanks */
int lineno; /* Saved line # */
semiNL = FALSE;
ignDepOp = FALSE;
ignComment = FALSE;
/*
* Handle special-characters at the beginning of the line. Either a
* leading tab (shell command) or pound-sign (possible conditional)
* forces us to ignore comments and dependency operators and treat
* semi-colons as semi-colons (by leaving semiNL FALSE). This also
* discards completely blank lines.
*/
for (;;) {
c = ParseReadc();
if (c == '\t') {
ignComment = ignDepOp = TRUE;
break;
} else if (c == '\n') {
CURFILE->lineno++;
} else if (c == '#') {
ParseUnreadc(c);
break;
} else {
/*
* Anything else breaks out without doing anything
*/
break;
}
}
if (c != EOF) {
lastc = c;
buf = Buf_Init(MAKE_BSIZE);
while (((c = ParseReadc()) != '\n' || lastc == '\\') &&
c != EOF) {
test_char:
switch (c) {
case '\n':
/*
* Escaped newline: read characters until a
* non-space or an unescaped newline and
* replace them all by a single space. This is
* done by storing the space over the backslash
* and dropping through with the next nonspace.
* If it is a semi-colon and semiNL is TRUE,
* it will be recognized as a newline in the
* code below this...
*/
CURFILE->lineno++;
lastc = ' ';
while ((c = ParseReadc()) == ' ' || c == '\t') {
continue;
}
if (c == EOF || c == '\n') {
goto line_read;
} else {
/*
* Check for comments, semiNL's, etc. --
* easier than ParseUnreadc(c);
* continue;
*/
goto test_char;
}
/*NOTREACHED*/
break;
case ';':
/*
* Semi-colon: Need to see if it should be
* interpreted as a newline
*/
if (semiNL) {
/*
* To make sure the command that may
* be following this semi-colon begins
* with a tab, we push one back into the
* input stream. This will overwrite the
* semi-colon in the buffer. If there is
* no command following, this does no
* harm, since the newline remains in
* the buffer and the
* whole line is ignored.
*/
ParseUnreadc('\t');
goto line_read;
}
break;
case '=':
if (!semiNL) {
/*
* Haven't seen a dependency operator
* before this, so this must be a
* variable assignment -- don't pay
* attention to dependency operators
* after this.
*/
ignDepOp = TRUE;
} else if (lastc == ':' || lastc == '!') {
/*
* Well, we've seen a dependency
* operator already, but it was the
* previous character, so this is really
* just an expanded variable assignment.
* Revert semi-colons to being just
* semi-colons again and ignore any more
* dependency operators.
*
* XXX: Note that a line like
* "foo : a:=b" will blow up, but who'd
* write a line like that anyway?
*/
ignDepOp = TRUE;
semiNL = FALSE;
}
break;
case '#':
if (!ignComment) {
if (lastc != '\\') {
/*
* If the character is a hash
* mark and it isn't escaped
* (or we're being compatible),
* the thing is a comment.
* Skip to the end of the line.
*/
do {
c = ParseReadc();
} while (c != '\n' && c != EOF);
goto line_read;
} else {
/*
* Don't add the backslash.
* Just let the # get copied
* over.
*/
lastc = c;
continue;
}
}
break;
case ':':
case '!':
if (!ignDepOp && (c == ':' || c == '!')) {
/*
* A semi-colon is recognized as a
* newline only on dependency lines.
* Dependency lines are lines with a
* colon or an exclamation point.
* Ergo...
*/
semiNL = TRUE;
}
break;
default:
break;
}
/*
* Copy in the previous character and save this one in
* lastc.
*/
Buf_AddByte(buf, (Byte)lastc);
lastc = c;
}
line_read:
CURFILE->lineno++;
if (lastc != '\0') {
Buf_AddByte(buf, (Byte)lastc);
}
Buf_AddByte(buf, (Byte)'\0');
line = Buf_Peel(buf);
/*
* Strip trailing blanks and tabs from the line.
* Do not strip a blank or tab that is preceded by
* a '\'
*/
ep = line;
while (*ep)
++ep;
while (ep > line + 1 && (ep[-1] == ' ' || ep[-1] == '\t')) {
if (ep > line + 1 && ep[-2] == '\\')
break;
--ep;
}
*ep = 0;
if (line[0] == '.') {
/*
* The line might be a conditional. Ask the
* conditional module about it and act accordingly
*/
switch (Cond_Eval(line, CURFILE->lineno)) {
case COND_SKIP:
/*
* Skip to next conditional that evaluates to
* COND_PARSE.
*/
do {
free(line);
line = ParseSkipLine(1, 0);
} while (line &&
Cond_Eval(line, CURFILE->lineno) !=
COND_PARSE);
if (line == NULL)
break;
/*FALLTHRU*/
case COND_PARSE:
free(line);
line = ParseReadLine();
break;
case COND_INVALID:
if (For_Eval(line)) {
int ok;
free(line);
lineno = CURFILE->lineno;
do {
/*
* Skip after the matching end
*/
line = ParseSkipLine(0, 1);
if (line == NULL) {
Parse_Error(PARSE_FATAL,
"Unexpected end of"
" file in for "
"loop.\n");
break;
}
ok = For_Eval(line);
free(line);
} while (ok);
if (line != NULL)
For_Run(lineno);
line = ParseReadLine();
}
break;
default:
break;
}
}
return (line);
} else {
/*
* Hit end-of-file, so return a NULL line to indicate this.
*/
return (NULL);
}
}
/*-
*-----------------------------------------------------------------------
* ParseFinishLine --
* Handle the end of a dependency group.
*
* Results:
* Nothing.
*
* Side Effects:
* inLine set FALSE. 'targets' list destroyed.
*
*-----------------------------------------------------------------------
*/
static void
ParseFinishLine(void)
{
const LstNode *ln;
if (inLine) {
LST_FOREACH(ln, &targets) {
if (((const GNode *)Lst_Datum(ln))->type & OP_TRANSFORM)
Suff_EndTransform(Lst_Datum(ln));
}
Lst_Destroy(&targets, ParseHasCommands);
inLine = FALSE;
}
}
/*-
*---------------------------------------------------------------------
* Parse_File --
* Parse a file into its component parts, incorporating it into the
* current dependency graph. This is the main function and controls
* almost every other function in this module
*
* Results:
* None
*
* Side Effects:
* Loads. Nodes are added to the list of all targets, nodes and links
* are added to the dependency graph. etc. etc. etc.
*---------------------------------------------------------------------
*/
void
Parse_File(const char *name, FILE *stream)
{
char *cp; /* pointer into the line */
char *line; /* the line we're working on */
Buffer *buf;
inLine = FALSE;
fatals = 0;
ParsePushInput(estrdup(name), stream, NULL, 0);
do {
while ((line = ParseReadLine()) != NULL) {
if (*line == '.') {
/*
* Lines that begin with the special character
* are either include or undef directives.
*/
for (cp = line + 1; isspace((unsigned char)*cp);
cp++) {
continue;
}
if (strncmp(cp, "include", 7) == 0) {
ParseDoInclude(cp + 7);
goto nextLine;
} else if (strncmp(cp, "error", 5) == 0) {
ParseDoError(cp + 5);
goto nextLine;
} else if (strncmp(cp, "warning", 7) == 0) {
ParseDoWarning(cp + 7);
goto nextLine;
} else if (strncmp(cp, "undef", 5) == 0) {
char *cp2;
for (cp += 5;
isspace((unsigned char)*cp);
cp++) {
continue;
}
for (cp2 = cp;
!isspace((unsigned char)*cp2) &&
*cp2 != '\0'; cp2++) {
continue;
}
*cp2 = '\0';
buf = Var_Subst(NULL, cp, VAR_CMD,
FALSE);
cp = Buf_Peel(buf);
Var_Delete(cp, VAR_GLOBAL);
goto nextLine;
}
}
if (*line == '#') {
/*
* If we're this far, the line must be
* a comment.
*/
goto nextLine;
}
if (*line == '\t') {
/*
* If a line starts with a tab, it can only
* hope to be a creation command.
*/
for (cp = line + 1;
isspace((unsigned char)*cp); cp++) {
continue;
}
if (*cp) {
if (inLine) {
LstNode *ln;
GNode *gn;
/*
* So long as it's not a blank
* line and we're actually in a
* dependency spec, add the
* command to the list of
* commands of all targets in
* the dependency spec.
*/
LST_FOREACH(ln, &targets) {
gn = Lst_Datum(ln);
/*
* if target already
* supplied, ignore
* commands
*/
if (!(gn->type &
OP_HAS_COMMANDS))
Lst_AtEnd(&gn->commands, cp);
else
Parse_Error(PARSE_WARNING, "duplicate script "
"for target \"%s\" ignored", gn->name);
}
continue;
} else {
Parse_Error(PARSE_FATAL,
"Unassociated shell command \"%s\"",
cp);
}
}
#ifdef SYSVINCLUDE
} else if (strncmp(line, "include", 7) == 0 &&
isspace((unsigned char)line[7]) &&
strchr(line, ':') == NULL) {
/*
* It's an S3/S5-style "include".
*/
ParseTraditionalInclude(line + 7);
goto nextLine;
#endif
} else if (Parse_IsVar(line)) {
ParseFinishLine();
Parse_DoVar(line, VAR_GLOBAL);
} else {
/*
* We now know it's a dependency line so it
* needs to have all variables expanded before
* being parsed. Tell the variable module to
* complain if some variable is undefined...
* To make life easier on novices, if the line
* is indented we first make sure the line has
* a dependency operator in it. If it doesn't
* have an operator and we're in a dependency
* line's script, we assume it's actually a
* shell command and add it to the current
* list of targets.
*/
cp = line;
if (isspace((unsigned char)line[0])) {
while (*cp != '\0' &&
isspace((unsigned char)*cp)) {
cp++;
}
if (*cp == '\0') {
goto nextLine;
}
}
ParseFinishLine();
buf = Var_Subst(NULL, line, VAR_CMD, TRUE);
cp = Buf_Peel(buf);
free(line);
line = cp;
/*
* Need a non-circular list for the target nodes
*/
Lst_Destroy(&targets, NOFREE);
inLine = TRUE;
ParseDoDependency(line);
}
nextLine:
free(line);
}
/*
* Reached EOF, but it may be just EOF of an include file...
*/
} while (ParsePopInput() == CONTINUE);
ParseFinishLine();
/*
* Make sure conditionals are clean
*/
Cond_End();
if (fatals)
errx(1, "fatal errors encountered -- cannot continue");
}
/*-
*---------------------------------------------------------------------
* Parse_Init --
* initialize the parsing module
*
* Results:
* none
*
* Side Effects:
* the parseIncPath list is initialized...
*---------------------------------------------------------------------
*/
void
Parse_Init(void)
{
mainNode = NULL;
}
/*-
*-----------------------------------------------------------------------
* Parse_MainName --
* Return a Lst of the main target to create for main()'s sake. If
* no such target exists, we Punt with an obnoxious error message.
*
* Results:
* A Lst of the single node to create.
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
void
Parse_MainName(Lst *listmain)
{
if (mainNode == NULL) {
Punt("no target to make.");
/*NOTREACHED*/
} else if (mainNode->type & OP_DOUBLEDEP) {
Lst_AtEnd(listmain, mainNode);
Lst_Concat(listmain, &mainNode->cohorts, LST_CONCNEW);
} else
Lst_AtEnd(listmain, mainNode);
}
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