Aren/NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
87abaf9c31
NetBSD/usr.bin/make/parse.c
jtc d253881943 Fix bug #47. Shell commands start with tabs, not whitespace. Pmake's 
POSIX behavior must have been derrived from an early draft.
1993-12-17 23:52:04 +00:00

2209 lines
59 KiB
C
Raw Blame History

/*
* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
* Copyright (c) 1988, 1989 by Adam de Boor
* 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.
*/
#ifndef lint
/*static char sccsid[] = "from: @(#)parse.c 5.18 (Berkeley) 2/19/91";*/
static char rcsid[] = "$Id: parse.c,v 1.3 1993/12/17 23:52:04 jtc Exp $";
#endif /* not lint */
/*-
* 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 'fname' and '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 <varargs.h>
#include <stdio.h>
#include <ctype.h>
#include "make.h"
#include "buf.h"
#include "pathnames.h"
/*
* These values are returned by ParseEOF 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
static int ParseEOF();
static Lst targets; /* targets we're working on */
static Boolean inLine; /* true if currently in a dependency
* line or its commands */
static char *fname; /* name of current file (for errors) */
static int lineno; /* line number in current file */
static FILE *curFILE; /* current makefile */
static int fatals = 0;
static GNode *mainNode; /* The main target to create. This is the
* first target on the first dependency
* line in the first makefile */
/*
* Definitions for handling #include specifications
*/
typedef struct IFile {
char *fname; /* name of previous file */
int lineno; /* saved line number */
FILE * F; /* the open stream */
} IFile;
static Lst includes; /* stack of IFiles generated by
* #includes */
Lst parseIncPath; /* list of directories for "..." includes */
Lst sysIncPath; /* list of directories for <...> includes */
/*-
* 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 anything user-specified to
* make */
Not, /* Not special */
NotParallel, /* .NOTPARALELL */
Null, /* .NULL */
Order, /* .ORDER */
Path, /* .PATH */
Precious, /* .PRECIOUS */
Shell, /* .SHELL */
Silent, /* .SILENT */
SingleShell, /* .SINGLESHELL */
Suffixes, /* .SUFFIXES */
Attribute, /* Generic attribute */
} ParseSpecial;
ParseSpecial specType;
/*
* Predecessor node for handling .ORDER. Initialized to NILGNODE 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 {
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 },
{ ".OPTIONAL", Attribute, OP_OPTIONAL },
{ ".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 },
{ ".NULL", Null, 0 },
{ ".ORDER", Order, 0 },
{ ".PATH", Path, 0 },
{ ".PRECIOUS", Precious, OP_PRECIOUS },
{ ".RECURSIVE", Attribute, OP_MAKE },
{ ".SHELL", Shell, 0 },
{ ".SILENT", Silent, OP_SILENT },
{ ".SINGLESHELL", SingleShell, 0 },
{ ".SUFFIXES", Suffixes, 0 },
{ ".USE", Attribute, OP_USE },
};
/*-
*----------------------------------------------------------------------
* 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 (str)
char *str; /* String to find */
{
register int start,
end,
cur;
register 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(type, va_alist)
int type; /* Error type (PARSE_WARNING, PARSE_FATAL) */
va_dcl
{
va_list ap;
char *fmt;
(void)fprintf(stderr, "\"%s\", line %d: ", fname, lineno);
if (type == PARSE_WARNING)
(void)fprintf(stderr, "warning: ");
va_start(ap);
fmt = va_arg(ap, char *);
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
(void)fprintf(stderr, "\n");
(void)fflush(stderr);
if (type == PARSE_FATAL)
fatals += 1;
}
/*-
*---------------------------------------------------------------------
* ParseLinkSrc --
* Link the parent node to its new child. Used in a Lst_ForEach by
* ParseDoDependency. If the specType isn't 'Not', the parent
* isn't linked as a parent of the child.
*
* Results:
* Always = 0
*
* Side Effects:
* New elements are added to the parents list of cgn and the
* children list of cgn. the unmade field of pgn is updated
* to reflect the additional child.
*---------------------------------------------------------------------
*/
static int
ParseLinkSrc (pgn, cgn)
GNode *pgn; /* The parent node */
GNode *cgn; /* The child node */
{
if (Lst_Member (pgn->children, (ClientData)cgn) == NILLNODE) {
(void)Lst_AtEnd (pgn->children, (ClientData)cgn);
if (specType == Not) {
(void)Lst_AtEnd (cgn->parents, (ClientData)pgn);
}
pgn->unmade += 1;
}
return (0);
}
/*-
*---------------------------------------------------------------------
* ParseDoOp --
* Apply the parsed operator to the given target node. Used in a
* Lst_ForEach call by ParseDoDependency once all targets have
* been found and their operator parsed. If the previous and new
* operators are incompatible, a major error is taken.
*
* Results:
* Always 0
*
* Side Effects:
* The type field of the node is altered to reflect any new bits in
* the op.
*---------------------------------------------------------------------
*/
static int
ParseDoOp (gn, op)
GNode *gn; /* The node to which the operator is to be
* applied */
int op; /* The operator to apply */
{
/*
* 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 (1);
}
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.
*/
register GNode *cohort;
LstNode ln;
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.
*/
Lst_ForEach(gn->parents, ParseLinkSrc, (ClientData)cohort);
cohort->type = OP_DOUBLEDEP|OP_INVISIBLE;
(void)Lst_AtEnd(gn->cohorts, (ClientData)cohort);
/*
* Replace the node in the targets list with the new copy
*/
ln = Lst_Member(targets, (ClientData)gn);
Lst_Replace(ln, (ClientData)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;
return (0);
}
/*-
*---------------------------------------------------------------------
* 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 (tOp, src)
int tOp; /* operator (if any) from special targets */
char *src; /* name of the source to handle */
{
int op; /* operator (if any) from special source */
GNode *gn;
op = 0;
if (*src == '.' && isupper (src[1])) {
int keywd = ParseFindKeyword(src);
if (keywd != -1) {
op = parseKeywords[keywd].op;
}
}
if (op != 0) {
Lst_ForEach (targets, ParseDoOp, (ClientData)op);
} else if (specType == 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...
*/
(void) Lst_AtEnd (create, (ClientData)strdup(src));
/*
* Add the name to the .TARGETS variable as well, so the user cna
* employ that, if desired.
*/
Var_Append(".TARGETS", src, VAR_GLOBAL);
} else if (specType == Order) {
/*
* Create proper predecessor/successor links between the previous
* source and the current one.
*/
gn = Targ_FindNode(src, TARG_CREATE);
if (predecessor != NILGNODE) {
(void)Lst_AtEnd(predecessor->successors, (ClientData)gn);
(void)Lst_AtEnd(gn->preds, (ClientData)predecessor);
}
/*
* The current source now becomes the predecessor for the next one.
*/
predecessor = gn;
} else {
/*
* 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 {
Lst_ForEach (targets, ParseLinkSrc, (ClientData)gn);
}
if ((gn->type & OP_OPMASK) == OP_DOUBLEDEP) {
register GNode *cohort;
register LstNode ln;
for (ln=Lst_First(gn->cohorts); ln != NILLNODE; ln = Lst_Succ(ln)){
cohort = (GNode *)Lst_Datum(ln);
if (tOp) {
cohort->type |= tOp;
} else {
Lst_ForEach(targets, ParseLinkSrc, (ClientData)cohort);
}
}
}
}
}
/*-
*-----------------------------------------------------------------------
* ParseFindMain --
* Find a real target in the list and set it to be the main one.
* Called by ParseDoDependency when a main target hasn't been found
* yet.
*
* Results:
* 0 if main not found yet, 1 if it is.
*
* Side Effects:
* mainNode is changed and Targ_SetMain is called.
*
*-----------------------------------------------------------------------
*/
static int
ParseFindMain(gn)
GNode *gn; /* Node to examine */
{
if ((gn->type & (OP_NOTMAIN|OP_USE|OP_EXEC|OP_TRANSFORM)) == 0) {
mainNode = gn;
Targ_SetMain(gn);
return (1);
} else {
return (0);
}
}
/*-
*-----------------------------------------------------------------------
* ParseAddDir --
* Front-end for Dir_AddDir to make sure Lst_ForEach keeps going
*
* Results:
* === 0
*
* Side Effects:
* See Dir_AddDir.
*
*-----------------------------------------------------------------------
*/
static int
ParseAddDir(path, name)
Lst path;
char *name;
{
Dir_AddDir(path, name);
return(0);
}
/*-
*-----------------------------------------------------------------------
* ParseClearPath --
* Front-end for Dir_ClearPath to make sure Lst_ForEach keeps going
*
* Results:
* === 0
*
* Side Effects:
* See Dir_ClearPath
*
*-----------------------------------------------------------------------
*/
static int
ParseClearPath(path)
Lst path;
{
Dir_ClearPath(path);
return(0);
}
/*-
*---------------------------------------------------------------------
* 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 (line)
char *line; /* the line to parse */
{
register char *cp; /* our current position */
register GNode *gn; /* a general purpose temporary node */
register int op; /* the operator on the line */
char savec; /* a place to save a character */
Lst paths; /* List of search paths to alter when parsing
* a list of .PATH targets */
int tOp; /* operator from special target */
Lst sources; /* list of source names after expansion */
Lst curTargs; /* list of target names to be found and added
* to the targets list */
tOp = 0;
specType = Not;
paths = (Lst)NULL;
curTargs = Lst_Init(FALSE);
do {
for (cp = line;
*cp && !isspace (*cp) &&
(*cp != '!') && (*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.
*/
int length;
Boolean freeIt;
char *result;
result=Var_Parse(cp, VAR_CMD, TRUE, &length, &freeIt);
if (freeIt) {
free(result);
}
cp += length-1;
}
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 {
continue;
}
}
savec = *cp;
if (!*cp) {
/*
* Ending a dependency line without an operator is a Bozo
* no-no
*/
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 (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 == Path && parseKeywords[keywd].spec != Path) {
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.
* .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 NIL
*/
switch (specType) {
case Path:
if (paths == NULL) {
paths = Lst_Init(FALSE);
}
(void)Lst_AtEnd(paths, (ClientData)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;
(void)Lst_AtEnd(targets, (ClientData)gn);
break;
case Default:
gn = Targ_NewGN(".DEFAULT");
gn->type |= (OP_NOTMAIN|OP_TRANSFORM);
(void)Lst_AtEnd(targets, (ClientData)gn);
DEFAULT = gn;
break;
case NotParallel:
{
extern int maxJobs;
maxJobs = 1;
break;
}
case SingleShell:
/* backwards = 1; */
break;
case Order:
predecessor = NILGNODE;
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.
*/
Lst path;
specType = Path;
path = Suff_GetPath (&line[5]);
if (path == NILLST) {
Parse_Error (PARSE_FATAL,
"Suffix '%s' not defined (yet)",
&line[5]);
return;
} else {
if (paths == (Lst)NULL) {
paths = Lst_Init(FALSE);
}
(void)Lst_AtEnd(paths, (ClientData)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')) {
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 Dir_Destroy in the destruction of the path as the
* Dir module could have added a directory to the path...
*/
Lst emptyPath = Lst_Init(FALSE);
Dir_Expand(line, emptyPath, curTargs);
Lst_Destroy(emptyPath, Dir_Destroy);
} else {
/*
* No wildcards, but we want to avoid code duplication,
* so create a list with the word on it.
*/
(void)Lst_AtEnd(curTargs, (ClientData)line);
}
while(!Lst_IsEmpty(curTargs)) {
char *targName = (char *)Lst_DeQueue(curTargs);
if (!Suff_IsTransform (targName)) {
gn = Targ_FindNode (targName, TARG_CREATE);
} else {
gn = Suff_AddTransform (targName);
}
(void)Lst_AtEnd (targets, (ClientData)gn);
}
} else if (specType == Path && *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 != Path) {
Boolean warn = FALSE;
while ((*cp != '!') && (*cp != ':') && *cp) {
if (*cp != ' ' && *cp != '\t') {
warn = TRUE;
}
cp++;
}
if (warn) {
Parse_Error(PARSE_WARNING, "Extra target ignored");
}
} else {
while (*cp && isspace (*cp)) {
cp++;
}
}
line = cp;
} while ((*line != '!') && (*line != ':') && *line);
/*
* Don't need the list of target names anymore...
*/
Lst_Destroy(curTargs, NOFREE);
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 */
Lst_ForEach (targets, ParseDoOp, (ClientData)op);
/*
* Get to the first source
*/
while (*cp && isspace (*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 Path:
Lst_ForEach(paths, ParseClearPath, (ClientData)NULL);
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);
*line = '\0';
} else if (specType == Shell) {
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 == Path) ||
(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 savec;
while (*cp && !isspace (*cp)) {
cp++;
}
savec = *cp;
*cp = '\0';
switch (specType) {
case Suffixes:
Suff_AddSuffix (line);
break;
case Path:
Lst_ForEach(paths, ParseAddDir, (ClientData)line);
break;
case Includes:
Suff_AddInclude (line);
break;
case Libs:
Suff_AddLib (line);
break;
case Null:
Suff_SetNull (line);
break;
}
*cp = savec;
if (savec != '\0') {
cp++;
}
while (*cp && isspace (*cp)) {
cp++;
}
line = cp;
}
if (paths) {
Lst_Destroy(paths, NOFREE);
}
} else {
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 (*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 *gn;
sources = Lst_Init (FALSE);
if (Arch_ParseArchive (&line, sources, VAR_CMD) != SUCCESS) {
Parse_Error (PARSE_FATAL,
"Error in source archive spec \"%s\"", line);
return;
}
while (!Lst_IsEmpty (sources)) {
gn = (GNode *) Lst_DeQueue (sources);
ParseDoSrc (tOp, gn->name);
}
Lst_Destroy (sources, NOFREE);
cp = line;
} else {
if (*cp) {
*cp = '\0';
cp += 1;
}
ParseDoSrc (tOp, line);
}
while (*cp && isspace (*cp)) {
cp++;
}
line = cp;
}
}
if (mainNode == NILGNODE) {
/*
* 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 (targets, ParseFindMain, (ClientData)0);
}
}
/*-
*---------------------------------------------------------------------
* 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 (line)
register char *line; /* the line to check */
{
register Boolean wasSpace = FALSE; /* set TRUE if found a space */
register Boolean haveName = FALSE; /* Set TRUE if have a variable name */
/*
* Skip to variable name
*/
while ((*line == ' ') || (*line == '\t')) {
line++;
}
while (*line != '=') {
if (*line == '\0') {
/*
* end-of-line -- can't be a variable assignment.
*/
return (FALSE);
} else if ((*line == ' ') || (*line == '\t')) {
/*
* there can be as much white space as desired so long as there is
* only one word before the operator
*/
wasSpace = TRUE;
} else if (wasSpace && haveName) {
/*
* Stop when an = operator is found.
*/
if ((*line == '+') || (*line == ':') || (*line == '?') ||
(*line == '!')) {
break;
}
/*
* This is the start of another word, so not assignment.
*/
return (FALSE);
} else {
haveName = TRUE;
wasSpace = FALSE;
}
line++;
}
/*
* A final check: if we stopped on a +, ?, ! or :, the next character must
* be an = or it ain't a valid assignment
*/
if (((*line == '+') ||
(*line == '?') ||
(*line == ':') ||
(*line == '!')) &&
(line[1] != '='))
{
return (FALSE);
} else {
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 (line, ctxt)
char *line; /* a line guaranteed to be a variable
* assignment. This reduces error checks */
GNode *ctxt; /* Context in which to do the assignment */
{
register 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 */
/*
* 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 (*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:
type = VAR_NORMAL;
break;
}
while (isspace (*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.. $(CFLAGS)
*
* And not get an error.
*/
Boolean oldOldVars = oldVars;
oldVars = FALSE;
cp = Var_Subst(cp, ctxt, FALSE);
oldVars = oldOldVars;
Var_Set(line, cp, ctxt);
free(cp);
} else if (type == VAR_SHELL) {
char result[BUFSIZ]; /* Result of command */
char *args[4]; /* Args for invoking the shell */
int fds[2]; /* Pipe streams */
int cpid; /* Child PID */
int pid; /* PID from wait() */
Boolean freeCmd; /* TRUE if the command needs to be freed, i.e.
* if any variable expansion was performed */
/*
* Set up arguments for shell
*/
args[0] = "sh";
args[1] = "-c";
if (index(cp, '$') != (char *)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.
*/
args[2] = Var_Subst(cp, VAR_CMD, TRUE);
freeCmd = TRUE;
} else {
args[2] = cp;
freeCmd = FALSE;
}
args[3] = (char *)NULL;
/*
* Open a pipe for fetching its output
*/
pipe(fds);
/*
* Fork
*/
cpid = vfork();
if (cpid == 0) {
/*
* Close input side of pipe
*/
close(fds[0]);
/*
* Duplicate the output stream to the shell's output, then
* shut the extra thing down. Note we don't fetch the error
* stream...why not? Why?
*/
dup2(fds[1], 1);
close(fds[1]);
execv("/bin/sh", args);
_exit(1);
} else if (cpid < 0) {
/*
* Couldn't fork -- tell the user and make the variable null
*/
Parse_Error(PARSE_WARNING, "Couldn't exec \"%s\"", cp);
Var_Set(line, "", ctxt);
} else {
int status;
int cc;
/*
* No need for the writing half
*/
close(fds[1]);
/*
* Wait for the process to exit.
*
* XXX: If the child writes more than a pipe's worth, we will
* deadlock.
*/
while(((pid = wait(&status)) != cpid) && (pid >= 0)) {
;
}
/*
* Read all the characters the child wrote.
*/
cc = read(fds[0], result, sizeof(result));
if (cc < 0) {
/*
* Couldn't read the child's output -- tell the user and
* set the variable to null
*/
Parse_Error(PARSE_WARNING, "Couldn't read shell's output");
cc = 0;
}
if (status) {
/*
* Child returned an error -- tell the user but still use
* the result.
*/
Parse_Error(PARSE_WARNING, "\"%s\" returned non-zero", cp);
}
/*
* Null-terminate the result, convert newlines to spaces and
* install it in the variable.
*/
result[cc] = '\0';
cp = &result[cc] - 1;
if (*cp == '\n') {
/*
* A final newline is just stripped
*/
*cp-- = '\0';
}
while (cp >= result) {
if (*cp == '\n') {
*cp = ' ';
}
cp--;
}
Var_Set(line, result, ctxt);
/*
* Close the input side of the pipe.
*/
close(fds[0]);
}
if (freeCmd) {
free(args[2]);
}
} else {
/*
* Normal assignment -- just do it.
*/
Var_Set (line, cp, ctxt);
}
}
/*-
* ParseAddCmd --
* Lst_ForEach function to add a command line to all targets
*
* Results:
* Always 0
*
* Side Effects:
* A new element is added to the commands list of the node.
*/
static
ParseAddCmd(gn, cmd)
GNode *gn; /* the node to which the command is to be added */
char *cmd; /* the command to add */
{
/* if target already supplied, ignore commands */
if (!(gn->type & OP_HAS_COMMANDS))
(void)Lst_AtEnd(gn->commands, (ClientData)cmd);
return(0);
}
/*-
*-----------------------------------------------------------------------
* 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:
* Always 0.
*
* Side Effects:
* OP_HAS_COMMANDS may be set for the target.
*
*-----------------------------------------------------------------------
*/
static int
ParseHasCommands(gn)
GNode *gn; /* Node to examine */
{
if (!Lst_IsEmpty(gn->commands)) {
gn->type |= OP_HAS_COMMANDS;
}
return(0);
}
/*-
*-----------------------------------------------------------------------
* 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 (dir)
char *dir; /* The name of the directory to add */
{
Dir_AddDir (parseIncPath, dir);
}
/*-
*---------------------------------------------------------------------
* 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, lineno,
* fname and curFILE are altered for the new file
*---------------------------------------------------------------------
*/
static void
ParseDoInclude (file)
char *file; /* file specification */
{
char *fullname; /* full pathname of file */
IFile *oldFile; /* state associated with current file */
Lst path; /* the path to use to find the 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 */
/*
* 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 .include filename. '%c' expected", endc);
return;
}
*cp = '\0';
/*
* Substitute for any variables in the file name before trying to
* find the thing.
*/
file = Var_Subst (file, VAR_CMD, FALSE);
/*
* 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;
prefEnd = rindex (fname, '/');
if (prefEnd != (char *)NULL) {
char *newName;
*prefEnd = '\0';
newName = str_concat (fname, file, STR_ADDSLASH);
fullname = Dir_FindFile (newName, parseIncPath);
if (fullname == (char *)NULL) {
fullname = Dir_FindFile(newName, dirSearchPath);
}
free (newName);
*prefEnd = '/';
} else {
fullname = (char *)NULL;
}
} else {
fullname = (char *)NULL;
}
if (fullname == (char *)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 = Dir_FindFile (file, parseIncPath);
if (fullname == (char *)NULL) {
fullname = Dir_FindFile(file, dirSearchPath);
}
}
if (fullname == (char *)NULL) {
/*
* Still haven't found the makefile. Look for it on the system
* path as a last resort.
*/
fullname = Dir_FindFile(file, sysIncPath);
}
if (fullname == (char *) NULL) {
*cp = endc;
Parse_Error (PARSE_FATAL, "Could not find %s", file);
return;
}
/*
* Once we find the absolute path to the file, we get to save all the
* state from the current file before we can start reading this
* include file. The state is stored in an IFile structure which
* is placed on a list with other IFile structures. The list makes
* a very nice stack to track how we got here...
*/
oldFile = (IFile *) emalloc (sizeof (IFile));
oldFile->fname = fname;
oldFile->F = curFILE;
oldFile->lineno = lineno;
(void) Lst_AtFront (includes, (ClientData)oldFile);
/*
* Once the previous state has been saved, we can get down to reading
* the new 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. Naturally enough, we start reading at line number 0.
*/
fname = fullname;
lineno = 0;
curFILE = fopen (fullname, "r");
if (curFILE == (FILE * ) NULL) {
Parse_Error (PARSE_FATAL, "Cannot open %s", fullname);
/*
* Pop to previous file
*/
(void) ParseEOF(0);
}
}
/*-
*---------------------------------------------------------------------
* ParseEOF --
* 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, is closed. The includes list is shortened.
* lineno, curFILE, and fname are changed if CONTINUE is returned.
*---------------------------------------------------------------------
*/
static int
ParseEOF (opened)
int opened;
{
IFile *ifile; /* the state on the top of the includes stack */
if (Lst_IsEmpty (includes)) {
return (DONE);
}
ifile = (IFile *) Lst_DeQueue (includes);
free (fname);
fname = ifile->fname;
lineno = ifile->lineno;
if (opened)
(void) fclose (curFILE);
curFILE = ifile->F;
free ((Address)ifile);
return (CONTINUE);
}
/*-
*---------------------------------------------------------------------
* ParseReadc --
* Read a character from the current file and update the line number
* counter as necessary
*
* Results:
* The character that was read
*
* Side Effects:
* The lineno counter is incremented if the character is a newline
*---------------------------------------------------------------------
*/
#ifdef notdef
static int parseReadChar;
#define ParseReadc() (((parseReadChar = getc(curFILE)) == '\n') ? \
(lineno++, '\n') : parseReadChar)
#else
#define ParseReadc() (getc(curFILE))
#endif /* notdef */
/*-
*---------------------------------------------------------------------
* 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 ()
{
Buffer buf; /* Buffer for current line */
register int c; /* the current character */
register 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 */
int lineLength; /* Length of result */
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.
*/
while(1) {
c = ParseReadc();
if (c == '\t') {
ignComment = ignDepOp = TRUE;
break;
} else if (c == '.') {
ignComment = TRUE;
break;
} else if (c == '\n') {
lineno++;
} else if (c == '#') {
ungetc(c, curFILE);
break;
} else {
/*
* Anything else breaks out without doing anything
*/
break;
}
}
if (c != EOF) {
lastc = c;
buf = Buf_Init(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...
*/
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
* ungetc(c, curFILE); continue;
*/
goto test_char;
}
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.
*/
ungetc('\t', curFILE);
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 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;
}
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;
}
/*
* Copy in the previous character and save this one in lastc.
*/
Buf_AddByte (buf, (Byte)lastc);
lastc = c;
}
line_read:
lineno++;
if (lastc != '\0') {
Buf_AddByte (buf, (Byte)lastc);
}
Buf_AddByte (buf, (Byte)'\0');
line = (char *)Buf_GetAll (buf, &lineLength);
Buf_Destroy (buf, FALSE);
if (line[0] == '.') {
/*
* The line might be a conditional. Ask the conditional module
* about it and act accordingly
*/
switch (Cond_Eval (line)) {
case COND_SKIP:
do {
/*
* Skip to next conditional that evaluates to COND_PARSE.
*/
free (line);
c = ParseReadc();
/*
* Skip lines until get to one that begins with a
* special char.
*/
while ((c != '.') && (c != EOF)) {
while (((c != '\n') || (lastc == '\\')) &&
(c != EOF))
{
/*
* Advance to next unescaped newline
*/
if ((lastc = c) == '\n') {
lineno++;
}
c = ParseReadc();
}
lineno++;
lastc = c;
c = ParseReadc ();
}
if (c == EOF) {
Parse_Error (PARSE_FATAL, "Unclosed conditional");
return ((char *)NULL);
}
/*
* Read the entire line into buf
*/
buf = Buf_Init (BSIZE);
do {
Buf_AddByte (buf, (Byte)c);
c = ParseReadc();
} while ((c != '\n') && (c != EOF));
lineno++;
Buf_AddByte (buf, (Byte)'\0');
line = (char *)Buf_GetAll (buf, &lineLength);
Buf_Destroy (buf, FALSE);
} while (Cond_Eval(line) != COND_PARSE);
/*FALLTHRU*/
case COND_PARSE:
free (line);
line = ParseReadLine();
break;
}
}
return (line);
} else {
/*
* Hit end-of-file, so return a NULL line to indicate this.
*/
return((char *)NULL);
}
}
/*-
*-----------------------------------------------------------------------
* ParseFinishLine --
* Handle the end of a dependency group.
*
* Results:
* Nothing.
*
* Side Effects:
* inLine set FALSE. 'targets' list destroyed.
*
*-----------------------------------------------------------------------
*/
static void
ParseFinishLine()
{
extern int Suff_EndTransform();
if (inLine) {
Lst_ForEach(targets, Suff_EndTransform, (ClientData)NULL);
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(name, stream)
char *name; /* the name of the file being read */
FILE * stream; /* Stream open to makefile to parse */
{
register char *cp, /* pointer into the line */
*line; /* the line we're working on */
inLine = FALSE;
fname = name;
curFILE = stream;
lineno = 0;
fatals = 0;
do {
while (line = ParseReadLine ()) {
if (*line == '.') {
/*
* Lines that begin with the special character are either
* include or undef directives.
*/
for (cp = line + 1; isspace (*cp); cp++) {
continue;
}
if (strncmp (cp, "include", 7) == 0) {
ParseDoInclude (cp + 7);
goto nextLine;
} else if (strncmp(cp, "undef", 5) == 0) {
char *cp2;
for (cp += 5; isspace(*cp); cp++) {
continue;
}
for (cp2 = cp; !isspace(*cp2) && (*cp2 != '\0'); cp2++) {
continue;
}
*cp2 = '\0';
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.
*/
shellCommand:
for (cp = line + 1; isspace (*cp); cp++) {
continue;
}
if (*cp) {
if (inLine) {
/*
* 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 (targets, ParseAddCmd, (ClientData)cp);
continue;
} else {
Parse_Error (PARSE_FATAL,
"Unassociated shell command \"%.20s\"",
cp);
}
}
} 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.
*
* Note that POSIX declares all lines that start with
* whitespace are shell commands, so there's no need to check
* here...
*/
Boolean nonSpace = FALSE;
cp = line;
#ifndef POSIX
if (line[0] == ' ') {
while ((*cp != ':') && (*cp != '!') && (*cp != '\0')) {
if (!isspace(*cp)) {
nonSpace = TRUE;
}
cp++;
}
}
if (*cp == '\0') {
if (inLine) {
Parse_Error (PARSE_WARNING,
"Shell command needs a leading tab");
goto shellCommand;
} else if (nonSpace) {
Parse_Error (PARSE_FATAL, "Missing operator");
}
} else {
#endif
ParseFinishLine();
cp = Var_Subst (line, VAR_CMD, TRUE);
free (line);
line = cp;
/*
* Need a non-circular list for the target nodes
*/
targets = Lst_Init (FALSE);
inLine = TRUE;
ParseDoDependency (line);
#ifndef POSIX
}
#endif
}
nextLine:
free (line);
}
/*
* Reached EOF, but it may be just EOF of an include file...
*/
} while (ParseEOF(1) == CONTINUE);
/*
* Make sure conditionals are clean
*/
Cond_End();
if (fatals) {
fprintf (stderr, "Fatal errors encountered -- cannot continue\n");
exit (1);
}
}
/*-
*---------------------------------------------------------------------
* Parse_Init --
* initialize the parsing module
*
* Results:
* none
*
* Side Effects:
* the parseIncPath list is initialized...
*---------------------------------------------------------------------
*/
Parse_Init ()
{
char *cp, *start;
/* avoid faults on read-only strings */
static char syspath[] = _PATH_DEFSYSPATH;
mainNode = NILGNODE;
parseIncPath = Lst_Init (FALSE);
sysIncPath = Lst_Init (FALSE);
includes = Lst_Init (FALSE);
/*
* Add the directories from the DEFSYSPATH (more than one may be given
* as dir1:...:dirn) to the system include path.
*/
for (start = syspath; *start != '\0'; start = cp) {
for (cp = start; *cp != '\0' && *cp != ':'; cp++) {
;
}
if (*cp == '\0') {
Dir_AddDir(sysIncPath, start);
} else {
*cp++ = '\0';
Dir_AddDir(sysIncPath, start);
}
}
}
/*-
*-----------------------------------------------------------------------
* 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.
*
*-----------------------------------------------------------------------
*/
Lst
Parse_MainName()
{
Lst main; /* result list */
main = Lst_Init (FALSE);
if (mainNode == NILGNODE) {
Punt ("make: no target to make.\n");
/*NOTREACHED*/
} else if (mainNode->type & OP_DOUBLEDEP) {
Lst_Concat(main, mainNode->cohorts, LST_CONCNEW);
}
(void) Lst_AtEnd (main, (ClientData)mainNode);
return (main);
}
Reference in New Issue View Git Blame Copy Permalink