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535c59a6a9
freebsd-nq/parse.c
Simon J. Gerraty 535c59a6a9 Import bmake-20220208 
* unit-tests/Makefile: disable opt-debug-x-trace on Linux if there
	is any chance we have dash as .SHELL

	* meta.c: use a variable to hold command line to be filtered
	to avoid any side effects from content of command line.
2022-02-09 09:22:21 -08:00

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/* $NetBSD: parse.c,v 1.663 2022/02/07 23:24:26 rillig Exp $ */
/*
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. 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. 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.
*/
/*
* 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.
*/
/*
* Parsing of makefiles.
*
* Parse_File is the main entry point and controls most of the other
* functions in this module.
*
* Interface:
* Parse_Init Initialize the module
*
* Parse_End Clean up the module
*
* Parse_File Parse a top-level makefile. Included files are
* handled by IncludeFile instead.
*
* Parse_VarAssign
* Try to parse the given line as 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 Report a parse error, a warning or an informational
* message.
*
* Parse_MainName Returns a list of the single main target to create.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdarg.h>
#include "make.h"
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef HAVE_MMAP
#include <sys/mman.h>
#ifndef MAP_COPY
#define MAP_COPY MAP_PRIVATE
#endif
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
#endif
#include "dir.h"
#include "job.h"
#include "pathnames.h"
/* "@(#)parse.c 8.3 (Berkeley) 3/19/94" */
MAKE_RCSID("$NetBSD: parse.c,v 1.663 2022/02/07 23:24:26 rillig Exp $");
/*
* A file being read.
*/
typedef struct IncludedFile {
FStr name; /* absolute or relative to the cwd */
unsigned lineno; /* 1-based */
unsigned readLines; /* the number of physical lines that have
* been read from the file */
unsigned forHeadLineno; /* 1-based */
unsigned forBodyReadLines; /* the number of physical lines that have
* been read from the file above the body of
* the .for loop */
unsigned int cond_depth; /* 'if' nesting when file opened */
bool depending; /* state of doing_depend on EOF */
Buffer buf; /* the file's content or the body of the .for
* loop; always ends with '\n' */
char *buf_ptr; /* next char to be read */
char *buf_end; /* buf_end[-1] == '\n' */
struct ForLoop *forLoop;
} IncludedFile;
/* Special attributes for target nodes. */
typedef enum ParseSpecial {
SP_ATTRIBUTE, /* Generic attribute */
SP_BEGIN, /* .BEGIN */
SP_DEFAULT, /* .DEFAULT */
SP_DELETE_ON_ERROR, /* .DELETE_ON_ERROR */
SP_END, /* .END */
SP_ERROR, /* .ERROR */
SP_IGNORE, /* .IGNORE */
SP_INCLUDES, /* .INCLUDES; not mentioned in the manual page */
SP_INTERRUPT, /* .INTERRUPT */
SP_LIBS, /* .LIBS; not mentioned in the manual page */
SP_MAIN, /* .MAIN and no user-specified targets to make */
SP_META, /* .META */
SP_MFLAGS, /* .MFLAGS or .MAKEFLAGS */
SP_NOMETA, /* .NOMETA */
SP_NOMETA_CMP, /* .NOMETA_CMP */
SP_NOPATH, /* .NOPATH */
SP_NOT, /* Not special */
SP_NOTPARALLEL, /* .NOTPARALLEL or .NO_PARALLEL */
SP_NULL, /* .NULL; not mentioned in the manual page */
SP_OBJDIR, /* .OBJDIR */
SP_ORDER, /* .ORDER */
SP_PARALLEL, /* .PARALLEL; not mentioned in the manual page */
SP_PATH, /* .PATH or .PATH.suffix */
SP_PHONY, /* .PHONY */
#ifdef POSIX
SP_POSIX, /* .POSIX; not mentioned in the manual page */
#endif
SP_PRECIOUS, /* .PRECIOUS */
SP_SHELL, /* .SHELL */
SP_SILENT, /* .SILENT */
SP_SINGLESHELL, /* .SINGLESHELL; not mentioned in the manual page */
SP_STALE, /* .STALE */
SP_SUFFIXES, /* .SUFFIXES */
SP_WAIT /* .WAIT */
} ParseSpecial;
typedef List SearchPathList;
typedef ListNode SearchPathListNode;
typedef enum VarAssignOp {
VAR_NORMAL, /* = */
VAR_APPEND, /* += */
VAR_DEFAULT, /* ?= */
VAR_SUBST, /* := */
VAR_SHELL /* != or :sh= */
} VarAssignOp;
typedef struct VarAssign {
char *varname; /* unexpanded */
VarAssignOp op;
const char *value; /* unexpanded */
} VarAssign;
static bool Parse_IsVar(const char *, VarAssign *);
static void Parse_Var(VarAssign *, GNode *);
/*
* The target to be made if no targets are specified in the command line.
* This is the first target defined in any of the makefiles.
*/
GNode *mainNode;
/*
* During parsing, the targets from the left-hand side of the currently
* active dependency line, or NULL if the current line does not belong to a
* dependency line, for example because it is a variable assignment.
*
* See unit-tests/deptgt.mk, keyword "parse.c:targets".
*/
static GNodeList *targets;
#ifdef CLEANUP
/*
* All shell commands for all targets, in no particular order and possibly
* with duplicates. Kept in a separate list since the commands from .USE or
* .USEBEFORE nodes are shared with other GNodes, thereby giving up the
* easily understandable ownership over the allocated strings.
*/
static StringList targCmds = LST_INIT;
#endif
/*
* Predecessor node for handling .ORDER. Initialized to NULL when .ORDER
* is seen, then set to each successive source on the line.
*/
static GNode *order_pred;
static int parseErrors = 0;
/*
* The include chain of makefiles. At index 0 is the top-level makefile from
* the command line, followed by the included files or .for loops, up to and
* including the current file.
*
* See PrintStackTrace for how to interpret the data.
*/
static Vector /* of IncludedFile */ includes;
SearchPath *parseIncPath; /* directories for "..." includes */
SearchPath *sysIncPath; /* directories for <...> includes */
SearchPath *defSysIncPath; /* default for sysIncPath */
/*
* 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 (SP_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 const struct {
const char name[17];
ParseSpecial special; /* when used as a target */
GNodeType targetAttr; /* when used as a source */
} parseKeywords[] = {
{ ".BEGIN", SP_BEGIN, OP_NONE },
{ ".DEFAULT", SP_DEFAULT, OP_NONE },
{ ".DELETE_ON_ERROR", SP_DELETE_ON_ERROR, OP_NONE },
{ ".END", SP_END, OP_NONE },
{ ".ERROR", SP_ERROR, OP_NONE },
{ ".EXEC", SP_ATTRIBUTE, OP_EXEC },
{ ".IGNORE", SP_IGNORE, OP_IGNORE },
{ ".INCLUDES", SP_INCLUDES, OP_NONE },
{ ".INTERRUPT", SP_INTERRUPT, OP_NONE },
{ ".INVISIBLE", SP_ATTRIBUTE, OP_INVISIBLE },
{ ".JOIN", SP_ATTRIBUTE, OP_JOIN },
{ ".LIBS", SP_LIBS, OP_NONE },
{ ".MADE", SP_ATTRIBUTE, OP_MADE },
{ ".MAIN", SP_MAIN, OP_NONE },
{ ".MAKE", SP_ATTRIBUTE, OP_MAKE },
{ ".MAKEFLAGS", SP_MFLAGS, OP_NONE },
{ ".META", SP_META, OP_META },
{ ".MFLAGS", SP_MFLAGS, OP_NONE },
{ ".NOMETA", SP_NOMETA, OP_NOMETA },
{ ".NOMETA_CMP", SP_NOMETA_CMP, OP_NOMETA_CMP },
{ ".NOPATH", SP_NOPATH, OP_NOPATH },
{ ".NOTMAIN", SP_ATTRIBUTE, OP_NOTMAIN },
{ ".NOTPARALLEL", SP_NOTPARALLEL, OP_NONE },
{ ".NO_PARALLEL", SP_NOTPARALLEL, OP_NONE },
{ ".NULL", SP_NULL, OP_NONE },
{ ".OBJDIR", SP_OBJDIR, OP_NONE },
{ ".OPTIONAL", SP_ATTRIBUTE, OP_OPTIONAL },
{ ".ORDER", SP_ORDER, OP_NONE },
{ ".PARALLEL", SP_PARALLEL, OP_NONE },
{ ".PATH", SP_PATH, OP_NONE },
{ ".PHONY", SP_PHONY, OP_PHONY },
#ifdef POSIX
{ ".POSIX", SP_POSIX, OP_NONE },
#endif
{ ".PRECIOUS", SP_PRECIOUS, OP_PRECIOUS },
{ ".RECURSIVE", SP_ATTRIBUTE, OP_MAKE },
{ ".SHELL", SP_SHELL, OP_NONE },
{ ".SILENT", SP_SILENT, OP_SILENT },
{ ".SINGLESHELL", SP_SINGLESHELL, OP_NONE },
{ ".STALE", SP_STALE, OP_NONE },
{ ".SUFFIXES", SP_SUFFIXES, OP_NONE },
{ ".USE", SP_ATTRIBUTE, OP_USE },
{ ".USEBEFORE", SP_ATTRIBUTE, OP_USEBEFORE },
{ ".WAIT", SP_WAIT, OP_NONE },
};
static IncludedFile *
GetInclude(size_t i)
{
return Vector_Get(&includes, i);
}
/* The file that is currently being read. */
static IncludedFile *
CurFile(void)
{
return GetInclude(includes.len - 1);
}
static Buffer
loadfile(const char *path, int fd)
{
ssize_t n;
Buffer buf;
size_t bufSize;
struct stat st;
bufSize = fstat(fd, &st) == 0 && S_ISREG(st.st_mode) &&
st.st_size > 0 && st.st_size < 1024 * 1024 * 1024
? (size_t)st.st_size : 1024;
Buf_InitSize(&buf, bufSize);
for (;;) {
if (buf.len == buf.cap) {
if (buf.cap >= 512 * 1024 * 1024) {
Error("%s: file too large", path);
exit(2); /* Not 1 so -q can distinguish error */
}
Buf_Expand(&buf);
}
assert(buf.len < buf.cap);
n = read(fd, buf.data + buf.len, buf.cap - buf.len);
if (n < 0) {
Error("%s: read error: %s", path, strerror(errno));
exit(2); /* Not 1 so -q can distinguish error */
}
if (n == 0)
break;
buf.len += (size_t)n;
}
assert(buf.len <= buf.cap);
if (!Buf_EndsWith(&buf, '\n'))
Buf_AddByte(&buf, '\n');
return buf; /* may not be null-terminated */
}
/*
* Print the current chain of .include and .for directives. In Parse_Fatal
* or other functions that already print the location, includingInnermost
* would be redundant, but in other cases like Error or Fatal it needs to be
* included.
*/
void
PrintStackTrace(bool includingInnermost)
{
const IncludedFile *entries;
size_t i, n;
entries = GetInclude(0);
n = includes.len;
if (n == 0)
return;
if (!includingInnermost && entries[n - 1].forLoop == NULL)
n--; /* already in the diagnostic */
for (i = n; i-- > 0;) {
const IncludedFile *entry = entries + i;
const char *fname = entry->name.str;
char dirbuf[MAXPATHLEN + 1];
if (fname[0] != '/' && strcmp(fname, "(stdin)") != 0)
fname = realpath(fname, dirbuf);
if (entry->forLoop != NULL) {
char *details = ForLoop_Details(entry->forLoop);
debug_printf("\tin .for loop from %s:%u with %s\n",
fname, entry->forHeadLineno, details);
free(details);
} else if (i + 1 < n && entries[i + 1].forLoop != NULL) {
/* entry->lineno is not a useful line number */
} else
debug_printf("\tin %s:%u\n", fname, entry->lineno);
}
}
/* Check if the current character is escaped on the current line. */
static bool
IsEscaped(const char *line, const char *p)
{
bool escaped = false;
while (p > line && *--p == '\\')
escaped = !escaped;
return escaped;
}
/*
* Add the filename and lineno to the GNode so that we remember where it
* was first defined.
*/
static void
RememberLocation(GNode *gn)
{
IncludedFile *curFile = CurFile();
gn->fname = Str_Intern(curFile->name.str);
gn->lineno = curFile->lineno;
}
/*
* Look in the table of keywords for one matching the given string.
* Return the index of the keyword, or -1 if it isn't there.
*/
static int
FindKeyword(const char *str)
{
int start = 0;
int end = sizeof parseKeywords / sizeof parseKeywords[0] - 1;
while (start <= end) {
int curr = start + (end - start) / 2;
int diff = strcmp(str, parseKeywords[curr].name);
if (diff == 0)
return curr;
if (diff < 0)
end = curr - 1;
else
start = curr + 1;
}
return -1;
}
void
PrintLocation(FILE *f, bool useVars, const char *fname, unsigned lineno)
{
char dirbuf[MAXPATHLEN + 1];
FStr dir, base;
if (!useVars || fname[0] == '/' || strcmp(fname, "(stdin)") == 0) {
(void)fprintf(f, "\"%s\" line %u: ", fname, lineno);
return;
}
dir = Var_Value(SCOPE_GLOBAL, ".PARSEDIR");
if (dir.str == NULL)
dir.str = ".";
if (dir.str[0] != '/')
dir.str = realpath(dir.str, dirbuf);
base = Var_Value(SCOPE_GLOBAL, ".PARSEFILE");
if (base.str == NULL)
base.str = str_basename(fname);
(void)fprintf(f, "\"%s/%s\" line %u: ", dir.str, base.str, lineno);
FStr_Done(&base);
FStr_Done(&dir);
}
static void MAKE_ATTR_PRINTFLIKE(6, 0)
ParseVErrorInternal(FILE *f, bool useVars, const char *fname, unsigned lineno,
ParseErrorLevel type, const char *fmt, va_list ap)
{
static bool fatal_warning_error_printed = false;
(void)fprintf(f, "%s: ", progname);
if (fname != NULL)
PrintLocation(f, useVars, fname, lineno);
if (type == PARSE_WARNING)
(void)fprintf(f, "warning: ");
(void)vfprintf(f, fmt, ap);
(void)fprintf(f, "\n");
(void)fflush(f);
if (type == PARSE_FATAL)
parseErrors++;
if (type == PARSE_WARNING && opts.parseWarnFatal) {
if (!fatal_warning_error_printed) {
Error("parsing warnings being treated as errors");
fatal_warning_error_printed = true;
}
parseErrors++;
}
if (DEBUG(PARSE))
PrintStackTrace(false);
}
static void MAKE_ATTR_PRINTFLIKE(4, 5)
ParseErrorInternal(const char *fname, unsigned lineno,
ParseErrorLevel type, const char *fmt, ...)
{
va_list ap;
(void)fflush(stdout);
va_start(ap, fmt);
ParseVErrorInternal(stderr, false, fname, lineno, type, fmt, ap);
va_end(ap);
if (opts.debug_file != stdout && opts.debug_file != stderr) {
va_start(ap, fmt);
ParseVErrorInternal(opts.debug_file, false, fname, lineno,
type, fmt, ap);
va_end(ap);
}
}
/*
* Print a parse error message, including location information.
*
* If the level is PARSE_FATAL, continue parsing until the end of the
* current top-level makefile, then exit (see Parse_File).
*
* Fmt is given without a trailing newline.
*/
void
Parse_Error(ParseErrorLevel type, const char *fmt, ...)
{
va_list ap;
const char *fname;
unsigned lineno;
if (includes.len == 0) {
fname = NULL;
lineno = 0;
} else {
IncludedFile *curFile = CurFile();
fname = curFile->name.str;
lineno = curFile->lineno;
}
(void)fflush(stdout);
va_start(ap, fmt);
ParseVErrorInternal(stderr, true, fname, lineno, type, fmt, ap);
va_end(ap);
if (opts.debug_file != stdout && opts.debug_file != stderr) {
va_start(ap, fmt);
ParseVErrorInternal(opts.debug_file, true, fname, lineno,
type, fmt, ap);
va_end(ap);
}
}
/*
* Handle an .info, .warning or .error directive. For an .error directive,
* exit immediately.
*/
static void
HandleMessage(ParseErrorLevel level, const char *levelName, const char *umsg)
{
char *xmsg;
if (umsg[0] == '\0') {
Parse_Error(PARSE_FATAL, "Missing argument for \".%s\"",
levelName);
return;
}
(void)Var_Subst(umsg, SCOPE_CMDLINE, VARE_WANTRES, &xmsg);
/* TODO: handle errors */
Parse_Error(level, "%s", xmsg);
free(xmsg);
if (level == PARSE_FATAL) {
PrintOnError(NULL, "\n");
exit(1);
}
}
/*
* Add the child to the parent's children, and for non-special targets, vice
* versa. Special targets such as .END do not need to be informed once the
* child target has been made.
*/
static void
LinkSource(GNode *pgn, GNode *cgn, bool isSpecial)
{
if ((pgn->type & OP_DOUBLEDEP) && !Lst_IsEmpty(&pgn->cohorts))
pgn = pgn->cohorts.last->datum;
Lst_Append(&pgn->children, cgn);
pgn->unmade++;
/* Special targets like .END don't need any children. */
if (!isSpecial)
Lst_Append(&cgn->parents, pgn);
if (DEBUG(PARSE)) {
debug_printf("# LinkSource: added child %s - %s\n",
pgn->name, cgn->name);
Targ_PrintNode(pgn, 0);
Targ_PrintNode(cgn, 0);
}
}
/* Add the node to each target from the current dependency group. */
static void
LinkToTargets(GNode *gn, bool isSpecial)
{
GNodeListNode *ln;
for (ln = targets->first; ln != NULL; ln = ln->next)
LinkSource(ln->datum, gn, isSpecial);
}
static bool
TryApplyDependencyOperator(GNode *gn, GNodeType op)
{
/*
* If the node occurred on the left-hand side of a dependency and the
* operator also defines a dependency, they must match.
*/
if ((op & OP_OPMASK) && (gn->type & OP_OPMASK) &&
((op & OP_OPMASK) != (gn->type & OP_OPMASK))) {
Parse_Error(PARSE_FATAL, "Inconsistent operator for %s",
gn->name);
return false;
}
if (op == OP_DOUBLEDEP && (gn->type & OP_OPMASK) == OP_DOUBLEDEP) {
/*
* If the node was of the left-hand side of a '::' operator,
* we need to create a new instance of it for the children
* and commands on this dependency line since each of these
* dependency groups has its own attributes and commands,
* separate from the others.
*
* 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.
*/
GNode *cohort;
/*
* Propagate copied bits to the initial node. They'll be
* propagated back to the rest of the cohorts later.
*/
gn->type |= op & ~OP_OPMASK;
cohort = Targ_NewInternalNode(gn->name);
if (doing_depend)
RememberLocation(cohort);
/*
* 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.
*
* (I think this is pointless now, since the relevant list
* traversals will no longer see this node anyway. -mycroft)
*/
cohort->type = op | OP_INVISIBLE;
Lst_Append(&gn->cohorts, cohort);
cohort->centurion = gn;
gn->unmade_cohorts++;
snprintf(cohort->cohort_num, sizeof cohort->cohort_num, "#%d",
(unsigned int)gn->unmade_cohorts % 1000000);
} else {
/*
* 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 true;
}
static void
ApplyDependencyOperator(GNodeType op)
{
GNodeListNode *ln;
for (ln = targets->first; ln != NULL; ln = ln->next)
if (!TryApplyDependencyOperator(ln->datum, op))
break;
}
/*
* We add a .WAIT node in the dependency list. After any dynamic dependencies
* (and filename globbing) have happened, it is given a dependency on each
* previous child, back until the previous .WAIT node. The next child won't
* be scheduled until the .WAIT node is built.
*
* We give each .WAIT node a unique name (mainly for diagnostics).
*/
static void
ApplyDependencySourceWait(bool isSpecial)
{
static unsigned wait_number = 0;
char wait_src[16];
GNode *gn;
snprintf(wait_src, sizeof wait_src, ".WAIT_%u", ++wait_number);
gn = Targ_NewInternalNode(wait_src);
if (doing_depend)
RememberLocation(gn);
gn->type = OP_WAIT | OP_PHONY | OP_DEPENDS | OP_NOTMAIN;
LinkToTargets(gn, isSpecial);
}
static bool
ApplyDependencySourceKeyword(const char *src, ParseSpecial special)
{
int keywd;
GNodeType targetAttr;
if (*src != '.' || !ch_isupper(src[1]))
return false;
keywd = FindKeyword(src);
if (keywd == -1)
return false;
targetAttr = parseKeywords[keywd].targetAttr;
if (targetAttr != OP_NONE) {
ApplyDependencyOperator(targetAttr);
return true;
}
if (parseKeywords[keywd].special == SP_WAIT) {
ApplyDependencySourceWait(special != SP_NOT);
return true;
}
return false;
}
/*
* In a line like ".MAIN: source1 source2", add all sources to the list of
* things to create, but only if the user didn't specify a target on the
* command line and .MAIN occurs for the first time.
*
* See HandleDependencyTargetSpecial, branch SP_MAIN.
* See unit-tests/cond-func-make-main.mk.
*/
static void
ApplyDependencySourceMain(const char *src)
{
Lst_Append(&opts.create, bmake_strdup(src));
/*
* Add the name to the .TARGETS variable as well, so the user can
* employ that, if desired.
*/
Global_Append(".TARGETS", src);
}
static void
ApplyDependencySourceOrder(const char *src)
{
GNode *gn;
/*
* Create proper predecessor/successor links between the previous
* source and the current one.
*/
gn = Targ_GetNode(src);
if (doing_depend)
RememberLocation(gn);
if (order_pred != NULL) {
Lst_Append(&order_pred->order_succ, gn);
Lst_Append(&gn->order_pred, order_pred);
if (DEBUG(PARSE)) {
debug_printf(
"# .ORDER forces '%s' to be made before '%s'\n",
order_pred->name, gn->name);
Targ_PrintNode(order_pred, 0);
Targ_PrintNode(gn, 0);
}
}
/*
* The current source now becomes the predecessor for the next one.
*/
order_pred = gn;
}
/* The source is not an attribute, so find/create a node for it. */
static void
ApplyDependencySourceOther(const char *src, GNodeType targetAttr,
ParseSpecial special)
{
GNode *gn;
gn = Targ_GetNode(src);
if (doing_depend)
RememberLocation(gn);
if (targetAttr != OP_NONE)
gn->type |= targetAttr;
else
LinkToTargets(gn, special != SP_NOT);
}
/*
* Given the name of a source in a dependency line, figure out if it is an
* attribute (such as .SILENT) and if so, apply it to all targets. Otherwise
* decide if there is some attribute which should be applied *to* the source
* because of some special target (such as .PHONY) and apply it if so.
* Otherwise, make the source a child of the targets.
*/
static void
ApplyDependencySource(GNodeType targetAttr, const char *src,
ParseSpecial special)
{
if (ApplyDependencySourceKeyword(src, special))
return;
if (special == SP_MAIN)
ApplyDependencySourceMain(src);
else if (special == SP_ORDER)
ApplyDependencySourceOrder(src);
else
ApplyDependencySourceOther(src, targetAttr, special);
}
/*
* 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.
*/
static void
MaybeUpdateMainTarget(void)
{
GNodeListNode *ln;
if (mainNode != NULL)
return;
for (ln = targets->first; ln != NULL; ln = ln->next) {
GNode *gn = ln->datum;
if (GNode_IsMainCandidate(gn)) {
DEBUG1(MAKE, "Setting main node to \"%s\"\n", gn->name);
mainNode = gn;
return;
}
}
}
static void
InvalidLineType(const char *line)
{
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 if (line[0] == '.') {
const char *dirstart = line + 1;
const char *dirend;
cpp_skip_whitespace(&dirstart);
dirend = dirstart;
while (ch_isalnum(*dirend) || *dirend == '-')
dirend++;
Parse_Error(PARSE_FATAL, "Unknown directive \"%.*s\"",
(int)(dirend - dirstart), dirstart);
} else
Parse_Error(PARSE_FATAL, "Invalid line type");
}
static void
ParseDependencyTargetWord(char **pp, const char *lstart)
{
const char *cp = *pp;
while (*cp != '\0') {
if ((ch_isspace(*cp) || *cp == '!' || *cp == ':' ||
*cp == '(') &&
!IsEscaped(lstart, cp))
break;
if (*cp == '$') {
/*
* Must be a dynamic source (would have been expanded
* otherwise).
*
* There should be no errors in this, as they would
* have been discovered in the initial Var_Subst and
* we wouldn't be here.
*/
FStr val;
(void)Var_Parse(&cp, SCOPE_CMDLINE,
VARE_PARSE_ONLY, &val);
FStr_Done(&val);
} else
cp++;
}
*pp += cp - *pp;
}
/*
* Handle special targets like .PATH, .DEFAULT, .BEGIN, .ORDER.
*
* See the tests deptgt-*.mk.
*/
static void
HandleDependencyTargetSpecial(const char *targetName,
ParseSpecial *inout_special,
SearchPathList **inout_paths)
{
switch (*inout_special) {
case SP_PATH:
if (*inout_paths == NULL)
*inout_paths = Lst_New();
Lst_Append(*inout_paths, &dirSearchPath);
break;
case SP_MAIN:
/*
* Allow targets from the command line to override the
* .MAIN node.
*/
if (!Lst_IsEmpty(&opts.create))
*inout_special = SP_NOT;
break;
case SP_BEGIN:
case SP_END:
case SP_STALE:
case SP_ERROR:
case SP_INTERRUPT: {
GNode *gn = Targ_GetNode(targetName);
if (doing_depend)
RememberLocation(gn);
gn->type |= OP_NOTMAIN | OP_SPECIAL;
Lst_Append(targets, gn);
break;
}
case SP_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. 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.
*/
GNode *gn = GNode_New(".DEFAULT");
gn->type |= OP_NOTMAIN | OP_TRANSFORM;
Lst_Append(targets, gn);
defaultNode = gn;
break;
}
case SP_DELETE_ON_ERROR:
deleteOnError = true;
break;
case SP_NOTPARALLEL:
opts.maxJobs = 1;
break;
case SP_SINGLESHELL:
opts.compatMake = true;
break;
case SP_ORDER:
order_pred = NULL;
break;
default:
break;
}
}
static bool
HandleDependencyTargetPath(const char *suffixName,
SearchPathList **inout_paths)
{
SearchPath *path;
path = Suff_GetPath(suffixName);
if (path == NULL) {
Parse_Error(PARSE_FATAL,
"Suffix '%s' not defined (yet)", suffixName);
return false;
}
if (*inout_paths == NULL)
*inout_paths = Lst_New();
Lst_Append(*inout_paths, path);
return true;
}
/* See if it's a special target and if so set inout_special to match it. */
static bool
HandleDependencyTarget(const char *targetName,
ParseSpecial *inout_special,
GNodeType *inout_targetAttr,
SearchPathList **inout_paths)
{
int keywd;
if (!(targetName[0] == '.' && ch_isupper(targetName[1])))
return true;
/*
* See if the target is a special target that must have it
* or its sources handled specially.
*/
keywd = FindKeyword(targetName);
if (keywd != -1) {
if (*inout_special == SP_PATH &&
parseKeywords[keywd].special != SP_PATH) {
Parse_Error(PARSE_FATAL, "Mismatched special targets");
return false;
}
*inout_special = parseKeywords[keywd].special;
*inout_targetAttr = parseKeywords[keywd].targetAttr;
HandleDependencyTargetSpecial(targetName, inout_special,
inout_paths);
} else if (strncmp(targetName, ".PATH", 5) == 0) {
*inout_special = SP_PATH;
if (!HandleDependencyTargetPath(targetName + 5, inout_paths))
return false;
}
return true;
}
static void
HandleDependencyTargetMundane(char *targetName)
{
StringList targetNames = LST_INIT;
if (Dir_HasWildcards(targetName)) {
SearchPath *emptyPath = SearchPath_New();
SearchPath_Expand(emptyPath, targetName, &targetNames);
SearchPath_Free(emptyPath);
} else
Lst_Append(&targetNames, targetName);
while (!Lst_IsEmpty(&targetNames)) {
char *targName = Lst_Dequeue(&targetNames);
GNode *gn = Suff_IsTransform(targName)
? Suff_AddTransform(targName)
: Targ_GetNode(targName);
if (doing_depend)
RememberLocation(gn);
Lst_Append(targets, gn);
}
}
static void
SkipExtraTargets(char **pp, const char *lstart)
{
bool warning = false;
const char *p = *pp;
while (*p != '\0') {
if (!IsEscaped(lstart, p) && (*p == '!' || *p == ':'))
break;
if (IsEscaped(lstart, p) || (*p != ' ' && *p != '\t'))
warning = true;
p++;
}
if (warning)
Parse_Error(PARSE_WARNING, "Extra target ignored");
*pp += p - *pp;
}
static void
CheckSpecialMundaneMixture(ParseSpecial special)
{
switch (special) {
case SP_DEFAULT:
case SP_STALE:
case SP_BEGIN:
case SP_END:
case SP_ERROR:
case SP_INTERRUPT:
/*
* These create nodes on which to hang commands, so targets
* shouldn't be empty.
*/
case SP_NOT:
/*
* Nothing special here -- targets can be empty if it wants.
*/
break;
default:
Parse_Error(PARSE_WARNING,
"Special and mundane targets don't mix. "
"Mundane ones ignored");
break;
}
}
/*
* In a dependency line like 'targets: sources' or 'targets! sources', parse
* the operator ':', '::' or '!' from between the targets and the sources.
*/
static GNodeType
ParseDependencyOp(char **pp)
{
if (**pp == '!')
return (*pp)++, OP_FORCE;
if ((*pp)[1] == ':')
return *pp += 2, OP_DOUBLEDEP;
else
return (*pp)++, OP_DEPENDS;
}
static void
ClearPaths(SearchPathList *paths)
{
if (paths != NULL) {
SearchPathListNode *ln;
for (ln = paths->first; ln != NULL; ln = ln->next)
SearchPath_Clear(ln->datum);
}
Dir_SetPATH();
}
/* Handle a "dependency" line like '.SPECIAL:' without any sources. */
static void
HandleDependencySourcesEmpty(ParseSpecial special, SearchPathList *paths)
{
switch (special) {
case SP_SUFFIXES:
Suff_ClearSuffixes();
break;
case SP_PRECIOUS:
allPrecious = true;
break;
case SP_IGNORE:
opts.ignoreErrors = true;
break;
case SP_SILENT:
opts.silent = true;
break;
case SP_PATH:
ClearPaths(paths);
break;
#ifdef POSIX
case SP_POSIX:
Global_Set("%POSIX", "1003.2");
break;
#endif
default:
break;
}
}
static void
AddToPaths(const char *dir, SearchPathList *paths)
{
if (paths != NULL) {
SearchPathListNode *ln;
for (ln = paths->first; ln != NULL; ln = ln->next)
(void)SearchPath_Add(ln->datum, dir);
}
}
/*
* 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.
*/
static void
ParseDependencySourceSpecial(ParseSpecial special, const char *word,
SearchPathList *paths)
{
switch (special) {
case SP_SUFFIXES:
Suff_AddSuffix(word);
break;
case SP_PATH:
AddToPaths(word, paths);
break;
case SP_INCLUDES:
Suff_AddInclude(word);
break;
case SP_LIBS:
Suff_AddLib(word);
break;
case SP_NULL:
Suff_SetNull(word);
break;
case SP_OBJDIR:
Main_SetObjdir(false, "%s", word);
break;
default:
break;
}
}
static bool
ApplyDependencyTarget(char *name, char *nameEnd, ParseSpecial *inout_special,
GNodeType *inout_targetAttr,
SearchPathList **inout_paths)
{
char savec = *nameEnd;
*nameEnd = '\0';
if (!HandleDependencyTarget(name, inout_special,
inout_targetAttr, inout_paths))
return false;
if (*inout_special == SP_NOT && *name != '\0')
HandleDependencyTargetMundane(name);
else if (*inout_special == SP_PATH && *name != '.' && *name != '\0')
Parse_Error(PARSE_WARNING, "Extra target (%s) ignored", name);
*nameEnd = savec;
return true;
}
static bool
ParseDependencyTargets(char **inout_cp,
const char *lstart,
ParseSpecial *inout_special,
GNodeType *inout_targetAttr,
SearchPathList **inout_paths)
{
char *cp = *inout_cp;
for (;;) {
char *tgt = cp;
ParseDependencyTargetWord(&cp, lstart);
/*
* If the word is followed by a left parenthesis, it's the
* name of one or more files inside an archive.
*/
if (!IsEscaped(lstart, cp) && *cp == '(') {
cp = tgt;
if (!Arch_ParseArchive(&cp, targets, SCOPE_CMDLINE)) {
Parse_Error(PARSE_FATAL,
"Error in archive specification: \"%s\"",
tgt);
return false;
}
continue;
}
if (*cp == '\0') {
InvalidLineType(lstart);
return false;
}
if (!ApplyDependencyTarget(tgt, cp, inout_special,
inout_targetAttr, inout_paths))
return false;
if (*inout_special != SP_NOT && *inout_special != SP_PATH)
SkipExtraTargets(&cp, lstart);
else
pp_skip_whitespace(&cp);
if (*cp == '\0')
break;
if ((*cp == '!' || *cp == ':') && !IsEscaped(lstart, cp))
break;
}
*inout_cp = cp;
return true;
}
static void
ParseDependencySourcesSpecial(char *start,
ParseSpecial special, SearchPathList *paths)
{
char savec;
while (*start != '\0') {
char *end = start;
while (*end != '\0' && !ch_isspace(*end))
end++;
savec = *end;
*end = '\0';
ParseDependencySourceSpecial(special, start, paths);
*end = savec;
if (savec != '\0')
end++;
pp_skip_whitespace(&end);
start = end;
}
}
static void
LinkVarToTargets(VarAssign *var)
{
GNodeListNode *ln;
for (ln = targets->first; ln != NULL; ln = ln->next)
Parse_Var(var, ln->datum);
}
static bool
ParseDependencySourcesMundane(char *start,
ParseSpecial special, GNodeType targetAttr)
{
while (*start != '\0') {
char *end = start;
VarAssign var;
/*
* Check for local variable assignment,
* rest of the line is the value.
*/
if (Parse_IsVar(start, &var)) {
/*
* Check if this makefile has disabled
* setting local variables.
*/
bool target_vars = GetBooleanExpr(
"${.MAKE.TARGET_LOCAL_VARIABLES}", true);
if (target_vars)
LinkVarToTargets(&var);
free(var.varname);
if (target_vars)
return true;
}
/*
* The targets take real sources, so we must beware of archive
* specifications (i.e. things with left parentheses in them)
* and handle them accordingly.
*/
for (; *end != '\0' && !ch_isspace(*end); end++) {
if (*end == '(' && end > start && end[-1] != '$') {
/*
* 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;
}
}
if (*end == '(') {
GNodeList sources = LST_INIT;
if (!Arch_ParseArchive(&start, &sources,
SCOPE_CMDLINE)) {
Parse_Error(PARSE_FATAL,
"Error in source archive spec \"%s\"",
start);
return false;
}
while (!Lst_IsEmpty(&sources)) {
GNode *gn = Lst_Dequeue(&sources);
ApplyDependencySource(targetAttr, gn->name,
special);
}
Lst_Done(&sources);
end = start;
} else {
if (*end != '\0') {
*end = '\0';
end++;
}
ApplyDependencySource(targetAttr, start, special);
}
pp_skip_whitespace(&end);
start = end;
}
return true;
}
/*
* From a dependency line like 'targets: sources', parse the sources.
*
* See the tests depsrc-*.mk.
*/
static void
ParseDependencySources(char *p, GNodeType targetAttr,
ParseSpecial special, SearchPathList **inout_paths)
{
if (*p == '\0') {
HandleDependencySourcesEmpty(special, *inout_paths);
} else if (special == SP_MFLAGS) {
Main_ParseArgLine(p);
return;
} else if (special == SP_SHELL) {
if (!Job_ParseShell(p)) {
Parse_Error(PARSE_FATAL,
"improper shell specification");
return;
}
return;
} else if (special == SP_NOTPARALLEL || special == SP_SINGLESHELL ||
special == SP_DELETE_ON_ERROR) {
return;
}
/* Now go for the sources. */
if (special == SP_SUFFIXES || special == SP_PATH ||
special == SP_INCLUDES || special == SP_LIBS ||
special == SP_NULL || special == SP_OBJDIR) {
ParseDependencySourcesSpecial(p, special, *inout_paths);
if (*inout_paths != NULL) {
Lst_Free(*inout_paths);
*inout_paths = NULL;
}
if (special == SP_PATH)
Dir_SetPATH();
} else {
assert(*inout_paths == NULL);
if (!ParseDependencySourcesMundane(p, special, targetAttr))
return;
}
MaybeUpdateMainTarget();
}
/*
* Parse a dependency line consisting of targets, followed by a dependency
* operator, optionally followed by sources.
*
* The nodes of the sources are linked as children to the nodes of the
* targets. Nodes are created as necessary.
*
* The operator is applied to each node in the global 'targets' list,
* which is where the nodes found for the targets are kept.
*
* The sources are parsed in much the same way as the targets, except
* that they are expanded using the wildcarding scheme of the C-Shell,
* and a target is created for each expanded word. Each of the resulting
* nodes is then linked to each of the targets as one of its children.
*
* Certain targets and sources such as .PHONY or .PRECIOUS are handled
* specially, see ParseSpecial.
*
* Transformation rules such as '.c.o' are also handled here, see
* Suff_AddTransform.
*
* Upon return, the value of the line is unspecified.
*/
static void
ParseDependency(char *line)
{
char *p;
SearchPathList *paths; /* search paths to alter when parsing a list
* of .PATH targets */
GNodeType targetAttr; /* from special sources */
ParseSpecial special; /* in special targets, the children are
* linked as children of the parent but not
* vice versa */
DEBUG1(PARSE, "ParseDependency(%s)\n", line);
p = line;
paths = NULL;
targetAttr = OP_NONE;
special = SP_NOT;
if (!ParseDependencyTargets(&p, line, &special, &targetAttr, &paths))
goto out;
if (!Lst_IsEmpty(targets))
CheckSpecialMundaneMixture(special);
ApplyDependencyOperator(ParseDependencyOp(&p));
pp_skip_whitespace(&p);
ParseDependencySources(p, targetAttr, special, &paths);
out:
if (paths != NULL)
Lst_Free(paths);
}
/*
* Determine the assignment operator and adjust the end of the variable
* name accordingly.
*/
static VarAssign
AdjustVarassignOp(const char *name, const char *nameEnd, const char *op,
const char *value)
{
VarAssignOp type;
VarAssign va;
if (op > name && op[-1] == '+') {
op--;
type = VAR_APPEND;
} else if (op > name && op[-1] == '?') {
op--;
type = VAR_DEFAULT;
} else if (op > name && op[-1] == ':') {
op--;
type = VAR_SUBST;
} else if (op > name && op[-1] == '!') {
op--;
type = VAR_SHELL;
} else {
type = VAR_NORMAL;
#ifdef SUNSHCMD
while (op > name && ch_isspace(op[-1]))
op--;
if (op - name >= 3 && memcmp(op - 3, ":sh", 3) == 0) {
op -= 3;
type = VAR_SHELL;
}
#endif
}
va.varname = bmake_strsedup(name, nameEnd < op ? nameEnd : op);
va.op = type;
va.value = value;
return va;
}
/*
* Parse a variable assignment, consisting of a single-word variable name,
* optional whitespace, an assignment operator, optional whitespace and the
* variable value.
*
* 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++ =".
*
* Used for both lines in a file and command line arguments.
*/
static bool
Parse_IsVar(const char *p, VarAssign *out_var)
{
const char *nameStart, *nameEnd, *firstSpace, *eq;
int level = 0;
cpp_skip_hspace(&p); /* Skip to variable name */
/*
* During parsing, the '+' of the '+=' operator is initially parsed
* as part of the variable name. It is later corrected, as is the
* ':sh' modifier. Of these two (nameEnd and eq), the earlier one
* determines the actual end of the variable name.
*/
nameStart = p;
firstSpace = NULL;
/*
* Scan for one of the assignment operators outside a variable
* expansion.
*/
while (*p != '\0') {
char ch = *p++;
if (ch == '(' || ch == '{') {
level++;
continue;
}
if (ch == ')' || ch == '}') {
level--;
continue;
}
if (level != 0)
continue;
if ((ch == ' ' || ch == '\t') && firstSpace == NULL)
firstSpace = p - 1;
while (ch == ' ' || ch == '\t')
ch = *p++;
if (ch == '\0')
return false;
#ifdef SUNSHCMD
if (ch == ':' && p[0] == 's' && p[1] == 'h') {
p += 2;
continue;
}
#endif
if (ch == '=')
eq = p - 1;
else if (*p == '=' &&
(ch == '+' || ch == ':' || ch == '?' || ch == '!'))
eq = p;
else if (firstSpace != NULL)
return false;
else
continue;
nameEnd = firstSpace != NULL ? firstSpace : eq;
p = eq + 1;
cpp_skip_whitespace(&p);
*out_var = AdjustVarassignOp(nameStart, nameEnd, eq, p);
return true;
}
return false;
}
/*
* Check for syntax errors such as unclosed expressions or unknown modifiers.
*/
static void
VarCheckSyntax(VarAssignOp type, const char *uvalue, GNode *scope)
{
if (opts.strict) {
if (type != VAR_SUBST && strchr(uvalue, '$') != NULL) {
char *expandedValue;
(void)Var_Subst(uvalue, scope, VARE_PARSE_ONLY,
&expandedValue);
/* TODO: handle errors */
free(expandedValue);
}
}
}
/* Perform a variable assignment that uses the operator ':='. */
static void
VarAssign_EvalSubst(GNode *scope, const char *name, const char *uvalue,
FStr *out_avalue)
{
char *evalue;
/*
* make sure that we set the variable the first time to nothing
* so that it gets substituted.
*
* TODO: Add a test that demonstrates why this code is needed,
* apart from making the debug log longer.
*
* XXX: The variable name is expanded up to 3 times.
*/
if (!Var_ExistsExpand(scope, name))
Var_SetExpand(scope, name, "");
(void)Var_Subst(uvalue, scope, VARE_KEEP_DOLLAR_UNDEF, &evalue);
/* TODO: handle errors */
Var_SetExpand(scope, name, evalue);
*out_avalue = FStr_InitOwn(evalue);
}
/* Perform a variable assignment that uses the operator '!='. */
static void
VarAssign_EvalShell(const char *name, const char *uvalue, GNode *scope,
FStr *out_avalue)
{
FStr cmd;
char *output, *error;
cmd = FStr_InitRefer(uvalue);
Var_Expand(&cmd, SCOPE_CMDLINE, VARE_UNDEFERR);
output = Cmd_Exec(cmd.str, &error);
Var_SetExpand(scope, name, output);
*out_avalue = FStr_InitOwn(output);
if (error != NULL) {
Parse_Error(PARSE_WARNING, "%s", error);
free(error);
}
FStr_Done(&cmd);
}
/*
* Perform a variable assignment.
*
* The actual value of the variable is returned in *out_true_avalue.
* Especially for VAR_SUBST and VAR_SHELL this can differ from the literal
* value.
*
* Return whether the assignment was actually performed, which is usually
* the case. It is only skipped if the operator is '?=' and the variable
* already exists.
*/
static bool
VarAssign_Eval(const char *name, VarAssignOp op, const char *uvalue,
GNode *scope, FStr *out_true_avalue)
{
FStr avalue = FStr_InitRefer(uvalue);
if (op == VAR_APPEND)
Var_AppendExpand(scope, name, uvalue);
else if (op == VAR_SUBST)
VarAssign_EvalSubst(scope, name, uvalue, &avalue);
else if (op == VAR_SHELL)
VarAssign_EvalShell(name, uvalue, scope, &avalue);
else {
/* XXX: The variable name is expanded up to 2 times. */
if (op == VAR_DEFAULT && Var_ExistsExpand(scope, name))
return false;
/* Normal assignment -- just do it. */
Var_SetExpand(scope, name, uvalue);
}
*out_true_avalue = avalue;
return true;
}
static void
VarAssignSpecial(const char *name, const char *avalue)
{
if (strcmp(name, MAKEOVERRIDES) == 0)
Main_ExportMAKEFLAGS(false); /* re-export MAKEFLAGS */
else if (strcmp(name, ".CURDIR") == 0) {
/*
* Someone is being (too?) clever...
* Let's pretend they know what they are doing and
* re-initialize the 'cur' CachedDir.
*/
Dir_InitCur(avalue);
Dir_SetPATH();
} else if (strcmp(name, MAKE_JOB_PREFIX) == 0)
Job_SetPrefix();
else if (strcmp(name, MAKE_EXPORTED) == 0)
Var_ExportVars(avalue);
}
/* Perform the variable assignment in the given scope. */
static void
Parse_Var(VarAssign *var, GNode *scope)
{
FStr avalue; /* actual value (maybe expanded) */
VarCheckSyntax(var->op, var->value, scope);
if (VarAssign_Eval(var->varname, var->op, var->value, scope, &avalue)) {
VarAssignSpecial(var->varname, avalue.str);
FStr_Done(&avalue);
}
}
/*
* See if the command possibly calls a sub-make by using the variable
* expressions ${.MAKE}, ${MAKE} or the plain word "make".
*/
static bool
MaybeSubMake(const char *cmd)
{
const char *start;
for (start = cmd; *start != '\0'; start++) {
const char *p = start;
char endc;
/* XXX: What if progname != "make"? */
if (strncmp(p, "make", 4) == 0)
if (start == cmd || !ch_isalnum(p[-1]))
if (!ch_isalnum(p[4]))
return true;
if (*p != '$')
continue;
p++;
if (*p == '{')
endc = '}';
else if (*p == '(')
endc = ')';
else
continue;
p++;
if (*p == '.') /* Accept either ${.MAKE} or ${MAKE}. */
p++;
if (strncmp(p, "MAKE", 4) == 0 && p[4] == endc)
return true;
}
return false;
}
/*
* Append the command to the target node.
*
* The node may be marked as a submake node if the command is determined to
* be that.
*/
static void
GNode_AddCommand(GNode *gn, char *cmd)
{
/* Add to last (ie current) cohort for :: targets */
if ((gn->type & OP_DOUBLEDEP) && gn->cohorts.last != NULL)
gn = gn->cohorts.last->datum;
/* if target already supplied, ignore commands */
if (!(gn->type & OP_HAS_COMMANDS)) {
Lst_Append(&gn->commands, cmd);
if (MaybeSubMake(cmd))
gn->type |= OP_SUBMAKE;
RememberLocation(gn);
} else {
#if 0
/* XXX: We cannot do this until we fix the tree */
Lst_Append(&gn->commands, cmd);
Parse_Error(PARSE_WARNING,
"overriding commands for target \"%s\"; "
"previous commands defined at %s: %u ignored",
gn->name, gn->fname, gn->lineno);
#else
Parse_Error(PARSE_WARNING,
"duplicate script for target \"%s\" ignored",
gn->name);
ParseErrorInternal(gn->fname, gn->lineno, PARSE_WARNING,
"using previous script for \"%s\" defined here",
gn->name);
#endif
}
}
/*
* Add a directory to the path searched for included makefiles bracketed
* by double-quotes.
*/
void
Parse_AddIncludeDir(const char *dir)
{
(void)SearchPath_Add(parseIncPath, dir);
}
/*
* Handle one of the .[-ds]include directives by remembering the current file
* and pushing the included file on the stack. After the included file has
* finished, parsing continues with the including file; see Parse_PushInput
* and ParseEOF.
*
* System includes are looked up in sysIncPath, any other includes are looked
* up in the parsedir and then in the directories specified by the -I command
* line options.
*/
static void
IncludeFile(const char *file, bool isSystem, bool depinc, bool silent)
{
Buffer buf;
char *fullname; /* full pathname of file */
char *newName;
char *slash, *incdir;
int fd;
int i;
fullname = file[0] == '/' ? bmake_strdup(file) : NULL;
if (fullname == NULL && !isSystem) {
/*
* Include files contained in double-quotes are first searched
* 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 file.
*/
incdir = bmake_strdup(CurFile()->name.str);
slash = strrchr(incdir, '/');
if (slash != NULL) {
*slash = '\0';
/*
* Now do lexical processing of leading "../" on the
* filename.
*/
for (i = 0; strncmp(file + i, "../", 3) == 0; i += 3) {
slash = strrchr(incdir + 1, '/');
if (slash == NULL || strcmp(slash, "/..") == 0)
break;
*slash = '\0';
}
newName = str_concat3(incdir, "/", file + i);
fullname = Dir_FindFile(newName, parseIncPath);
if (fullname == NULL)
fullname = Dir_FindFile(newName,
&dirSearchPath);
free(newName);
}
free(incdir);
if (fullname == NULL) {
/*
* 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. If we have a suffix-specific path, we
* should use that.
*/
const char *suff;
SearchPath *suffPath = NULL;
if ((suff = strrchr(file, '.')) != NULL) {
suffPath = Suff_GetPath(suff);
if (suffPath != NULL)
fullname = Dir_FindFile(file, suffPath);
}
if (fullname == NULL) {
fullname = Dir_FindFile(file, parseIncPath);
if (fullname == NULL)
fullname = Dir_FindFile(file,
&dirSearchPath);
}
}
}
/* Looking for a system file or file still not found */
if (fullname == NULL) {
/*
* Look for it on the system path
*/
SearchPath *path = Lst_IsEmpty(&sysIncPath->dirs)
? defSysIncPath : sysIncPath;
fullname = Dir_FindFile(file, path);
}
if (fullname == NULL) {
if (!silent)
Parse_Error(PARSE_FATAL, "Could not find %s", file);
return;
}
/* Actually open the file... */
fd = open(fullname, O_RDONLY);
if (fd == -1) {
if (!silent)
Parse_Error(PARSE_FATAL, "Cannot open %s", fullname);
free(fullname);
return;
}
buf = loadfile(fullname, fd);
(void)close(fd);
Parse_PushInput(fullname, 1, 0, buf, NULL);
if (depinc)
doing_depend = depinc; /* only turn it on */
free(fullname);
}
/*
* Parse a directive like '.include' or '.-include'.
*
* .include "user-makefile.mk"
* .include <system-makefile.mk>
*/
static void
ParseInclude(char *directive)
{
char endc; /* '>' or '"' */
char *p;
bool silent = directive[0] != 'i';
FStr file;
p = directive + (silent ? 8 : 7);
pp_skip_hspace(&p);
if (*p != '"' && *p != '<') {
Parse_Error(PARSE_FATAL,
".include filename must be delimited by '\"' or '<'");
return;
}
if (*p++ == '<')
endc = '>';
else
endc = '"';
file = FStr_InitRefer(p);
/* Skip to matching delimiter */
while (*p != '\0' && *p != endc)
p++;
if (*p != endc) {
Parse_Error(PARSE_FATAL,
"Unclosed .include filename. '%c' expected", endc);
return;
}
*p = '\0';
Var_Expand(&file, SCOPE_CMDLINE, VARE_WANTRES);
IncludeFile(file.str, endc == '>', directive[0] == 'd', silent);
FStr_Done(&file);
}
/*
* Split filename into dirname + basename, then assign these to the
* given variables.
*/
static void
SetFilenameVars(const char *filename, const char *dirvar, const char *filevar)
{
const char *slash, *basename;
FStr dirname;
slash = strrchr(filename, '/');
if (slash == NULL) {
dirname = FStr_InitRefer(curdir);
basename = filename;
} else {
dirname = FStr_InitOwn(bmake_strsedup(filename, slash));
basename = slash + 1;
}
Global_Set(dirvar, dirname.str);
Global_Set(filevar, basename);
DEBUG4(PARSE, "SetFilenameVars: ${%s} = `%s' ${%s} = `%s'\n",
dirvar, dirname.str, filevar, basename);
FStr_Done(&dirname);
}
/*
* Return the immediately including file.
*
* This is made complicated since the .for loop is implemented as a special
* kind of .include; see For_Run.
*/
static const char *
GetActuallyIncludingFile(void)
{
size_t i;
const IncludedFile *incs = GetInclude(0);
for (i = includes.len; i >= 2; i--)
if (incs[i - 1].forLoop == NULL)
return incs[i - 2].name.str;
return NULL;
}
/* Set .PARSEDIR, .PARSEFILE, .INCLUDEDFROMDIR and .INCLUDEDFROMFILE. */
static void
SetParseFile(const char *filename)
{
const char *including;
SetFilenameVars(filename, ".PARSEDIR", ".PARSEFILE");
including = GetActuallyIncludingFile();
if (including != NULL) {
SetFilenameVars(including,
".INCLUDEDFROMDIR", ".INCLUDEDFROMFILE");
} else {
Global_Delete(".INCLUDEDFROMDIR");
Global_Delete(".INCLUDEDFROMFILE");
}
}
static bool
StrContainsWord(const char *str, const char *word)
{
size_t strLen = strlen(str);
size_t wordLen = strlen(word);
const char *p;
if (strLen < wordLen)
return false;
for (p = str; p != NULL; p = strchr(p, ' ')) {
if (*p == ' ')
p++;
if (p > str + strLen - wordLen)
return false;
if (memcmp(p, word, wordLen) == 0 &&
(p[wordLen] == '\0' || p[wordLen] == ' '))
return true;
}
return false;
}
/*
* XXX: Searching through a set of words with this linear search is
* inefficient for variables that contain thousands of words.
*
* XXX: The paths in this list don't seem to be normalized in any way.
*/
static bool
VarContainsWord(const char *varname, const char *word)
{
FStr val = Var_Value(SCOPE_GLOBAL, varname);
bool found = val.str != NULL && StrContainsWord(val.str, word);
FStr_Done(&val);
return found;
}
/*
* Track the makefiles we read - so makefiles can set dependencies on them.
* Avoid adding anything more than once.
*
* Time complexity: O(n) per call, in total O(n^2), where n is the number
* of makefiles that have been loaded.
*/
static void
TrackInput(const char *name)
{
if (!VarContainsWord(MAKE_MAKEFILES, name))
Global_Append(MAKE_MAKEFILES, name);
}
/* Parse from the given buffer, later return to the current file. */
void
Parse_PushInput(const char *name, unsigned lineno, unsigned readLines,
Buffer buf, struct ForLoop *forLoop)
{
IncludedFile *curFile;
if (forLoop != NULL)
name = CurFile()->name.str;
else
TrackInput(name);
DEBUG3(PARSE, "Parse_PushInput: %s %s, line %u\n",
forLoop != NULL ? ".for loop in": "file", name, lineno);
curFile = Vector_Push(&includes);
curFile->name = FStr_InitOwn(bmake_strdup(name));
curFile->lineno = lineno;
curFile->readLines = readLines;
curFile->forHeadLineno = lineno;
curFile->forBodyReadLines = readLines;
curFile->buf = buf;
curFile->depending = doing_depend; /* restore this on EOF */
curFile->forLoop = forLoop;
if (forLoop != NULL && !For_NextIteration(forLoop, &curFile->buf))
abort(); /* see For_Run */
curFile->buf_ptr = curFile->buf.data;
curFile->buf_end = curFile->buf.data + curFile->buf.len;
curFile->cond_depth = Cond_save_depth();
SetParseFile(name);
}
/* Check if the directive is an include directive. */
static bool
IsInclude(const char *dir, bool sysv)
{
if (dir[0] == 's' || dir[0] == '-' || (dir[0] == 'd' && !sysv))
dir++;
if (strncmp(dir, "include", 7) != 0)
return false;
/* Space is not mandatory for BSD .include */
return !sysv || ch_isspace(dir[7]);
}
#ifdef SYSVINCLUDE
/* Check if the line is a SYSV include directive. */
static bool
IsSysVInclude(const char *line)
{
const char *p;
if (!IsInclude(line, true))
return false;
/* Avoid interpreting a dependency line as an include */
for (p = line; (p = strchr(p, ':')) != NULL;) {
/* end of line -> it's a dependency */
if (*++p == '\0')
return false;
/* '::' operator or ': ' -> it's a dependency */
if (*p == ':' || ch_isspace(*p))
return false;
}
return true;
}
/* Push to another file. The line points to the word "include". */
static void
ParseTraditionalInclude(char *line)
{
char *cp; /* current position in file spec */
bool done = false;
bool silent = line[0] != 'i';
char *file = line + (silent ? 8 : 7);
char *all_files;
DEBUG1(PARSE, "ParseTraditionalInclude: %s\n", file);
pp_skip_whitespace(&file);
(void)Var_Subst(file, SCOPE_CMDLINE, VARE_WANTRES, &all_files);
/* TODO: handle errors */
for (file = all_files; !done; file = cp + 1) {
/* Skip to end of line or next whitespace */
for (cp = file; *cp != '\0' && !ch_isspace(*cp); cp++)
continue;
if (*cp != '\0')
*cp = '\0';
else
done = true;
IncludeFile(file, false, false, silent);
}
free(all_files);
}
#endif
#ifdef GMAKEEXPORT
/* Parse "export <variable>=<value>", and actually export it. */
static void
ParseGmakeExport(char *line)
{
char *variable = line + 6;
char *value;
DEBUG1(PARSE, "ParseGmakeExport: %s\n", variable);
pp_skip_whitespace(&variable);
for (value = variable; *value != '\0' && *value != '='; value++)
continue;
if (*value != '=') {
Parse_Error(PARSE_FATAL,
"Variable/Value missing from \"export\"");
return;
}
*value++ = '\0'; /* terminate variable */
/*
* Expand the value before putting it in the environment.
*/
(void)Var_Subst(value, SCOPE_CMDLINE, VARE_WANTRES, &value);
/* TODO: handle errors */
setenv(variable, value, 1);
free(value);
}
#endif
/*
* Called when EOF is reached in the current file. If we were reading an
* include file or a .for loop, the includes stack is popped and things set
* up to go back to reading the previous file at the previous location.
*
* Results:
* true to continue parsing, i.e. it had only reached the end of an
* included file, false if the main file has been parsed completely.
*/
static bool
ParseEOF(void)
{
IncludedFile *curFile = CurFile();
doing_depend = curFile->depending;
if (curFile->forLoop != NULL &&
For_NextIteration(curFile->forLoop, &curFile->buf)) {
curFile->buf_ptr = curFile->buf.data;
curFile->buf_end = curFile->buf.data + curFile->buf.len;
curFile->readLines = curFile->forBodyReadLines;
return true;
}
/*
* Ensure the makefile (or .for loop) didn't have mismatched
* conditionals.
*/
Cond_restore_depth(curFile->cond_depth);
FStr_Done(&curFile->name);
Buf_Done(&curFile->buf);
if (curFile->forLoop != NULL)
ForLoop_Free(curFile->forLoop);
Vector_Pop(&includes);
if (includes.len == 0) {
/* We've run out of input */
Global_Delete(".PARSEDIR");
Global_Delete(".PARSEFILE");
Global_Delete(".INCLUDEDFROMDIR");
Global_Delete(".INCLUDEDFROMFILE");
return false;
}
curFile = CurFile();
DEBUG2(PARSE, "ParseEOF: returning to file %s, line %u\n",
curFile->name.str, curFile->readLines + 1);
SetParseFile(curFile->name.str);
return true;
}
typedef enum ParseRawLineResult {
PRLR_LINE,
PRLR_EOF,
PRLR_ERROR
} ParseRawLineResult;
/*
* Parse until the end of a line, taking into account lines that end with
* backslash-newline. The resulting line goes from out_line to out_line_end;
* the line is not null-terminated.
*/
static ParseRawLineResult
ParseRawLine(IncludedFile *curFile, char **out_line, char **out_line_end,
char **out_firstBackslash, char **out_commentLineEnd)
{
char *line = curFile->buf_ptr;
char *buf_end = curFile->buf_end;
char *p = line;
char *line_end = line;
char *firstBackslash = NULL;
char *commentLineEnd = NULL;
ParseRawLineResult res = PRLR_LINE;
curFile->readLines++;
for (;;) {
char ch;
if (p == buf_end) {
res = PRLR_EOF;
break;
}
ch = *p;
if (ch == '\0' || (ch == '\\' && p[1] == '\0')) {
Parse_Error(PARSE_FATAL, "Zero byte read from file");
return PRLR_ERROR;
}
/* Treat next character after '\' as literal. */
if (ch == '\\') {
if (firstBackslash == NULL)
firstBackslash = p;
if (p[1] == '\n') {
curFile->readLines++;
if (p + 2 == buf_end) {
line_end = p;
*line_end = '\n';
p += 2;
continue;
}
}
p += 2;
line_end = p;
assert(p <= buf_end);
continue;
}
/*
* Remember the first '#' for comment stripping, unless
* the previous char was '[', as in the modifier ':[#]'.
*/
if (ch == '#' && commentLineEnd == NULL &&
!(p > line && p[-1] == '['))
commentLineEnd = line_end;
p++;
if (ch == '\n')
break;
/* We are not interested in trailing whitespace. */
if (!ch_isspace(ch))
line_end = p;
}
curFile->buf_ptr = p;
*out_line = line;
*out_line_end = line_end;
*out_firstBackslash = firstBackslash;
*out_commentLineEnd = commentLineEnd;
return res;
}
/*
* Beginning at start, unescape '\#' to '#' and replace backslash-newline
* with a single space.
*/
static void
UnescapeBackslash(char *line, char *start)
{
const char *src = start;
char *dst = start;
char *spaceStart = line;
for (;;) {
char ch = *src++;
if (ch != '\\') {
if (ch == '\0')
break;
*dst++ = ch;
continue;
}
ch = *src++;
if (ch == '\0') {
/* Delete '\\' at the end of the buffer. */
dst--;
break;
}
/* Delete '\\' from before '#' on non-command lines. */
if (ch == '#' && line[0] != '\t')
*dst++ = ch;
else if (ch == '\n') {
cpp_skip_hspace(&src);
*dst++ = ' ';
} else {
/* Leave '\\' in the buffer for later. */
*dst++ = '\\';
*dst++ = ch;
/* Keep an escaped ' ' at the line end. */
spaceStart = dst;
}
}
/* Delete any trailing spaces - eg from empty continuations */
while (dst > spaceStart && ch_isspace(dst[-1]))
dst--;
*dst = '\0';
}
typedef enum LineKind {
/*
* Return the next line that is neither empty nor a comment.
* Backslash line continuations are folded into a single space.
* A trailing comment, if any, is discarded.
*/
LK_NONEMPTY,
/*
* Return the next line, even if it is empty or a comment.
* Preserve backslash-newline to keep the line numbers correct.
*
* Used in .for loops to collect the body of the loop while waiting
* for the corresponding .endfor.
*/
LK_FOR_BODY,
/*
* Return the next line that starts with a dot.
* Backslash line continuations are folded into a single space.
* A trailing comment, if any, is discarded.
*
* Used in .if directives to skip over irrelevant branches while
* waiting for the corresponding .endif.
*/
LK_DOT
} LineKind;
/*
* Return the next "interesting" logical line from the current file. The
* returned string will be freed at the end of including the file.
*/
static char *
ReadLowLevelLine(LineKind kind)
{
IncludedFile *curFile = CurFile();
ParseRawLineResult res;
char *line;
char *line_end;
char *firstBackslash;
char *commentLineEnd;
for (;;) {
curFile->lineno = curFile->readLines + 1;
res = ParseRawLine(curFile,
&line, &line_end, &firstBackslash, &commentLineEnd);
if (res == PRLR_ERROR)
return NULL;
if (line == line_end || line == commentLineEnd) {
if (res == PRLR_EOF)
return NULL;
if (kind != LK_FOR_BODY)
continue;
}
/* We now have a line of data */
assert(ch_isspace(*line_end));
*line_end = '\0';
if (kind == LK_FOR_BODY)
return line; /* Don't join the physical lines. */
if (kind == LK_DOT && line[0] != '.')
continue;
break;
}
if (commentLineEnd != NULL && line[0] != '\t')
*commentLineEnd = '\0';
if (firstBackslash != NULL)
UnescapeBackslash(line, firstBackslash);
return line;
}
static bool
SkipIrrelevantBranches(void)
{
const char *line;
while ((line = ReadLowLevelLine(LK_DOT)) != NULL) {
if (Cond_EvalLine(line) == CR_TRUE)
return true;
/*
* TODO: Check for typos in .elif directives such as .elsif
* or .elseif.
*
* This check will probably duplicate some of the code in
* ParseLine. Most of the code there cannot apply, only
* ParseVarassign and ParseDependencyLine can, and to prevent
* code duplication, these would need to be called with a
* flag called onlyCheckSyntax.
*
* See directive-elif.mk for details.
*/
}
return false;
}
static bool
ParseForLoop(const char *line)
{
int rval;
unsigned forHeadLineno;
unsigned bodyReadLines;
int forLevel;
rval = For_Eval(line);
if (rval == 0)
return false; /* Not a .for line */
if (rval < 0)
return true; /* Syntax error - error printed, ignore line */
forHeadLineno = CurFile()->lineno;
bodyReadLines = CurFile()->readLines;
/* Accumulate the loop body until the matching '.endfor'. */
forLevel = 1;
do {
line = ReadLowLevelLine(LK_FOR_BODY);
if (line == NULL) {
Parse_Error(PARSE_FATAL,
"Unexpected end of file in .for loop");
break;
}
} while (For_Accum(line, &forLevel));
For_Run(forHeadLineno, bodyReadLines);
return true;
}
/*
* Read an entire line from the input file.
*
* Empty lines, .if and .for are completely handled by this function,
* leaving only variable assignments, other directives, dependency lines
* and shell commands to the caller.
*
* Return a line without trailing whitespace, or NULL for EOF. The returned
* string will be freed at the end of including the file.
*/
static char *
ReadHighLevelLine(void)
{
char *line;
for (;;) {
line = ReadLowLevelLine(LK_NONEMPTY);
if (line == NULL)
return NULL;
if (line[0] != '.')
return line;
switch (Cond_EvalLine(line)) {
case CR_FALSE: /* May also mean a syntax error. */
if (!SkipIrrelevantBranches())
return NULL;
continue;
case CR_TRUE:
continue;
case CR_ERROR: /* Not a conditional line */
if (ParseForLoop(line))
continue;
break;
}
return line;
}
}
static void
FinishDependencyGroup(void)
{
GNodeListNode *ln;
if (targets == NULL)
return;
for (ln = targets->first; ln != NULL; ln = ln->next) {
GNode *gn = ln->datum;
Suff_EndTransform(gn);
/*
* Mark the target as already having commands if it does, to
* keep from having shell commands on multiple dependency
* lines.
*/
if (!Lst_IsEmpty(&gn->commands))
gn->type |= OP_HAS_COMMANDS;
}
Lst_Free(targets);
targets = NULL;
}
/* Add the command to each target from the current dependency spec. */
static void
ParseLine_ShellCommand(const char *p)
{
cpp_skip_whitespace(&p);
if (*p == '\0')
return; /* skip empty commands */
if (targets == NULL) {
Parse_Error(PARSE_FATAL,
"Unassociated shell command \"%s\"", p);
return;
}
{
char *cmd = bmake_strdup(p);
GNodeListNode *ln;
for (ln = targets->first; ln != NULL; ln = ln->next) {
GNode *gn = ln->datum;
GNode_AddCommand(gn, cmd);
}
#ifdef CLEANUP
Lst_Append(&targCmds, cmd);
#endif
}
}
/*
* See if the line starts with one of the known directives, and if so, handle
* the directive.
*/
static bool
ParseDirective(char *line)
{
char *cp = line + 1;
const char *arg;
Substring dir;
pp_skip_whitespace(&cp);
if (IsInclude(cp, false)) {
ParseInclude(cp);
return true;
}
dir.start = cp;
while (ch_islower(*cp) || *cp == '-')
cp++;
dir.end = cp;
if (*cp != '\0' && !ch_isspace(*cp))
return false;
pp_skip_whitespace(&cp);
arg = cp;
if (Substring_Equals(dir, "undef"))
Var_Undef(arg);
else if (Substring_Equals(dir, "export"))
Var_Export(VEM_PLAIN, arg);
else if (Substring_Equals(dir, "export-env"))
Var_Export(VEM_ENV, arg);
else if (Substring_Equals(dir, "export-literal"))
Var_Export(VEM_LITERAL, arg);
else if (Substring_Equals(dir, "unexport"))
Var_UnExport(false, arg);
else if (Substring_Equals(dir, "unexport-env"))
Var_UnExport(true, arg);
else if (Substring_Equals(dir, "info"))
HandleMessage(PARSE_INFO, "info", arg);
else if (Substring_Equals(dir, "warning"))
HandleMessage(PARSE_WARNING, "warning", arg);
else if (Substring_Equals(dir, "error"))
HandleMessage(PARSE_FATAL, "error", arg);
else
return false;
return true;
}
bool
Parse_VarAssign(const char *line, bool finishDependencyGroup, GNode *scope)
{
VarAssign var;
if (!Parse_IsVar(line, &var))
return false;
if (finishDependencyGroup)
FinishDependencyGroup();
Parse_Var(&var, scope);
free(var.varname);
return true;
}
static char *
FindSemicolon(char *p)
{
int level = 0;
for (; *p != '\0'; p++) {
if (*p == '\\' && p[1] != '\0') {
p++;
continue;
}
if (*p == '$' && (p[1] == '(' || p[1] == '{'))
level++;
else if (level > 0 && (*p == ')' || *p == '}'))
level--;
else if (level == 0 && *p == ';')
break;
}
return p;
}
/*
* dependency -> [target...] op [source...] [';' command]
* op -> ':' | '::' | '!'
*/
static void
ParseDependencyLine(char *line)
{
VarEvalMode emode;
char *expanded_line;
const char *shellcmd = NULL;
/*
* For some reason - probably to make the parser impossible -
* a ';' can be used to separate commands from dependencies.
* Attempt to skip over ';' inside substitution patterns.
*/
{
char *semicolon = FindSemicolon(line);
if (*semicolon != '\0') {
/* Terminate the dependency list at the ';' */
*semicolon = '\0';
shellcmd = semicolon + 1;
}
}
/*
* We now know it's a dependency line so it needs to have all
* variables expanded before being parsed.
*
* XXX: Ideally the dependency line would first be split into
* its left-hand side, dependency operator and right-hand side,
* and then each side would be expanded on its own. This would
* allow for the left-hand side to allow only defined variables
* and to allow variables on the right-hand side to be undefined
* as well.
*
* Parsing the line first would also prevent that targets
* generated from variable expressions are interpreted as the
* dependency operator, such as in "target${:U\:} middle: source",
* in which the middle is interpreted as a source, not a target.
*/
/*
* In lint mode, allow undefined variables to appear in dependency
* lines.
*
* Ideally, only the right-hand side would allow undefined variables
* since it is common to have optional dependencies. Having undefined
* variables on the left-hand side is more unusual though. Since
* both sides are expanded in a single pass, there is not much choice
* what to do here.
*
* In normal mode, it does not matter whether undefined variables are
* allowed or not since as of 2020-09-14, Var_Parse does not print
* any parse errors in such a case. It simply returns the special
* empty string var_Error, which cannot be detected in the result of
* Var_Subst.
*/
emode = opts.strict ? VARE_WANTRES : VARE_UNDEFERR;
(void)Var_Subst(line, SCOPE_CMDLINE, emode, &expanded_line);
/* TODO: handle errors */
/* Need a fresh list for the target nodes */
if (targets != NULL)
Lst_Free(targets);
targets = Lst_New();
ParseDependency(expanded_line);
free(expanded_line);
if (shellcmd != NULL)
ParseLine_ShellCommand(shellcmd);
}
static void
ParseLine(char *line)
{
/*
* Lines that begin with '.' can be pretty much anything:
* - directives like '.include' or '.if',
* - suffix rules like '.c.o:',
* - dependencies for filenames that start with '.',
* - variable assignments like '.tmp=value'.
*/
if (line[0] == '.' && ParseDirective(line))
return;
if (line[0] == '\t') {
ParseLine_ShellCommand(line + 1);
return;
}
#ifdef SYSVINCLUDE
if (IsSysVInclude(line)) {
/*
* It's an S3/S5-style "include".
*/
ParseTraditionalInclude(line);
return;
}
#endif
#ifdef GMAKEEXPORT
if (strncmp(line, "export", 6) == 0 && ch_isspace(line[6]) &&
strchr(line, ':') == NULL) {
/*
* It's a Gmake "export".
*/
ParseGmakeExport(line);
return;
}
#endif
if (Parse_VarAssign(line, true, SCOPE_GLOBAL))
return;
FinishDependencyGroup();
ParseDependencyLine(line);
}
/*
* Parse a top-level makefile, incorporating its content into the global
* dependency graph.
*/
void
Parse_File(const char *name, int fd)
{
char *line;
Buffer buf;
buf = loadfile(name, fd != -1 ? fd : STDIN_FILENO);
if (fd != -1)
(void)close(fd);
assert(targets == NULL);
Parse_PushInput(name, 1, 0, buf, NULL);
do {
while ((line = ReadHighLevelLine()) != NULL) {
DEBUG2(PARSE, "Parsing line %u: %s\n",
CurFile()->lineno, line);
ParseLine(line);
}
/* Reached EOF, but it may be just EOF of an include file. */
} while (ParseEOF());
FinishDependencyGroup();
if (parseErrors != 0) {
(void)fflush(stdout);
(void)fprintf(stderr,
"%s: Fatal errors encountered -- cannot continue\n",
progname);
PrintOnError(NULL, "");
exit(1);
}
}
/* Initialize the parsing module. */
void
Parse_Init(void)
{
mainNode = NULL;
parseIncPath = SearchPath_New();
sysIncPath = SearchPath_New();
defSysIncPath = SearchPath_New();
Vector_Init(&includes, sizeof(IncludedFile));
}
/* Clean up the parsing module. */
void
Parse_End(void)
{
#ifdef CLEANUP
Lst_DoneCall(&targCmds, free);
assert(targets == NULL);
SearchPath_Free(defSysIncPath);
SearchPath_Free(sysIncPath);
SearchPath_Free(parseIncPath);
assert(includes.len == 0);
Vector_Done(&includes);
#endif
}
/*
* Return a list containing the single main target to create.
* If no such target exists, we Punt with an obnoxious error message.
*/
void
Parse_MainName(GNodeList *mainList)
{
if (mainNode == NULL)
Punt("no target to make.");
Lst_Append(mainList, mainNode);
if (mainNode->type & OP_DOUBLEDEP)
Lst_AppendAll(mainList, &mainNode->cohorts);
Global_Append(".TARGETS", mainNode->name);
}
int
Parse_NumErrors(void)
{
return parseErrors;
}
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