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var.c
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/* $OpenBSD: var.c,v 1.103 2019/12/22 09:26:23 espie Exp $ */
/* $NetBSD: var.c,v 1.18 1997/03/18 19:24:46 christos Exp $ */
/*
* Copyright (c) 1999,2000,2007 Marc Espie.
*
* Extensive code modifications for the OpenBSD project.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT 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 OPENBSD
* PROJECT 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) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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.
*/
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ohash.h>
#include "config.h"
#include "defines.h"
#include "buf.h"
#include "cmd_exec.h"
#include "stats.h"
#include "pathnames.h"
#include "varmodifiers.h"
#include "var.h"
#include "varname.h"
#include "error.h"
#include "str.h"
#include "var_int.h"
#include "memory.h"
#include "symtable.h"
#include "gnode.h"
#include "dump.h"
#include "lowparse.h"
/*
* This is a harmless return value for Var_Parse that can be used by Var_Subst
* to determine if there was an error in parsing -- easier than returning
* a flag, as things outside this module don't give a hoot.
*/
char var_Error[] = "";
GNode *current_node = NULL;
/*
* Similar to var_Error, but returned when the 'err' flag for Var_Parse is
* set false. Why not just use a constant? Well, gcc likes to condense
* identical string instances...
*/
static char varNoError[] = "";
bool errorIsOkay;
static bool checkEnvFirst; /* true if environment should be searched for
* variables before the global context */
void
Var_setCheckEnvFirst(bool yes)
{
checkEnvFirst = yes;
}
/*
* The rules for variable look-up are complicated.
*
* - Dynamic variables like $@ and $* are special. They always pertain to
* a given variable. In this implementation of make, it is an error to
* try to affect them manually. They are stored in a local symtable directly
* inside the gnode.
*
* Global variables can be obtained:
* - from the command line
* - from the environment
* - from the Makefile proper.
* All of these are stored in a hash global_variables.
*
* Variables set on the command line override Makefile contents, are
* passed to submakes (see Var_AddCmdLine), and are also exported to the
* environment.
*
* Without -e (!checkEnvFirst), make will see variables set in the
* Makefile, and default to the environment otherwise.
*
* With -e (checkEnvFirst), make will see the environment first, and that
* will override anything that's set in the Makefile (but not set on
* the command line).
*
* The SHELL variable is very special: it is never obtained from the
* environment, and never passed to the environment.
*/
/* definitions pertaining to dynamic variables */
/* full names of dynamic variables */
static char *varnames[] = {
TARGET,
PREFIX,
ARCHIVE,
MEMBER,
IMPSRC,
OODATE,
ALLSRC,
FTARGET,
DTARGET,
FPREFIX,
DPREFIX,
FARCHIVE,
DARCHIVE,
FMEMBER,
DMEMBER,
FIMPSRC,
DIMPSRC
};
static bool xtlist[] = {
false, /* GLOBAL_INDEX */
true, /* $@ */
false, /* $* */
false, /* $! */
true, /* $% */
true, /* $< */
false, /* $? */
false, /* $> */
true, /* ${@F} */
true, /* ${@D} */
false, /* ${*F} */
false, /* ${*D} */
false, /* ${!F} */
false, /* ${!D} */
true, /* ${%F} */
true, /* ${%D} */
true, /* ${<F} */
true, /* ${<D} */
};
/* so that we can access tlist[-1] */
static bool *tlist = xtlist+1;
/* hashed names of dynamic variables */
#include "varhashconsts.h"
/* extended indices for System V stuff */
#define FTARGET_INDEX 7
#define DTARGET_INDEX 8
#define FPREFIX_INDEX 9
#define DPREFIX_INDEX 10
#define FARCHIVE_INDEX 11
#define DARCHIVE_INDEX 12
#define FMEMBER_INDEX 13
#define DMEMBER_INDEX 14
#define FIMPSRC_INDEX 15
#define DIMPSRC_INDEX 16
#define GLOBAL_INDEX -1
#define EXTENDED2SIMPLE(i) (((i)-LOCAL_SIZE)/2)
#define IS_EXTENDED_F(i) ((i)%2 == 1)
static struct ohash global_variables;
typedef struct Var_ {
BUFFER val; /* the variable value */
unsigned int flags; /* miscellaneous status flags */
#define VAR_IN_USE 1 /* Variable's value currently being used. */
/* (Used to avoid recursion) */
#define VAR_DUMMY 2 /* Variable is currently just a name */
/* In particular: BUFFER is invalid */
#define VAR_FROM_CMD 4 /* Special source: command line */
#define VAR_FROM_ENV 8 /* Special source: environment */
#define VAR_SEEN_ENV 16 /* No need to go look up environment again */
#define VAR_IS_SHELL 32 /* Magic behavior */
#define POISONS (POISON_NORMAL | POISON_EMPTY | POISON_NOT_DEFINED)
/* Defined in var.h */
char name[1]; /* the variable's name */
} Var;
static struct ohash_info var_info = {
offsetof(Var, name),
NULL,
hash_calloc, hash_free, element_alloc
};
static int classify_var(const char *, const char **, uint32_t *);
static Var *find_global_var(const char *, const char *, uint32_t);
static Var *find_global_var_without_env(const char *, const char *, uint32_t);
static void fill_from_env(Var *);
static Var *create_var(const char *, const char *);
static void var_set_initial_value(Var *, const char *);
static void var_set_value(Var *, const char *);
#define var_get_value(v) ((v)->flags & VAR_EXEC_LATER ? \
var_exec_cmd(v) : \
Buf_Retrieve(&((v)->val)))
static char *var_exec_cmd(Var *);
static void var_append_value(Var *, const char *);
static void poison_check(Var *);
static void var_set_append(const char *, const char *, const char *, int, bool);
static void set_magic_shell_variable(void);
static void delete_var(Var *);
static void print_var(Var *);
static const char *find_rparen(const char *);
static const char *find_ket(const char *);
typedef const char * (*find_t)(const char *);
static find_t find_pos(int);
static void push_used(Var *);
static void pop_used(Var *);
static char *get_expanded_value(const char *, const char *, int, uint32_t,
SymTable *, bool, bool *);
static bool parse_base_variable_name(const char **, struct Name *, SymTable *);
/* Variable lookup function: return idx for dynamic variable, or
* GLOBAL_INDEX if name is not dynamic. Set up *pk for further use.
*/
static int
classify_var(const char *name, const char **enamePtr, uint32_t *pk)
{
size_t len;
*pk = ohash_interval(name, enamePtr);
len = *enamePtr - name;
/* substitute short version for long local name */
switch (*pk % MAGICSLOTS1) { /* MAGICSLOTS should be the */
case K_LONGALLSRC % MAGICSLOTS1:/* smallest constant yielding */
/* distinct case values */
if (*pk == K_LONGALLSRC && len == strlen(LONGALLSRC) &&
strncmp(name, LONGALLSRC, len) == 0)
return ALLSRC_INDEX;
break;
case K_LONGARCHIVE % MAGICSLOTS1:
if (*pk == K_LONGARCHIVE && len == strlen(LONGARCHIVE) &&
strncmp(name, LONGARCHIVE, len) == 0)
return ARCHIVE_INDEX;
break;
case K_LONGIMPSRC % MAGICSLOTS1:
if (*pk == K_LONGIMPSRC && len == strlen(LONGIMPSRC) &&
strncmp(name, LONGIMPSRC, len) == 0)
return IMPSRC_INDEX;
break;
case K_LONGMEMBER % MAGICSLOTS1:
if (*pk == K_LONGMEMBER && len == strlen(LONGMEMBER) &&
strncmp(name, LONGMEMBER, len) == 0)
return MEMBER_INDEX;
break;
case K_LONGOODATE % MAGICSLOTS1:
if (*pk == K_LONGOODATE && len == strlen(LONGOODATE) &&
strncmp(name, LONGOODATE, len) == 0)
return OODATE_INDEX;
break;
case K_LONGPREFIX % MAGICSLOTS1:
if (*pk == K_LONGPREFIX && len == strlen(LONGPREFIX) &&
strncmp(name, LONGPREFIX, len) == 0)
return PREFIX_INDEX;
break;
case K_LONGTARGET % MAGICSLOTS1:
if (*pk == K_LONGTARGET && len == strlen(LONGTARGET) &&
strncmp(name, LONGTARGET, len) == 0)
return TARGET_INDEX;
break;
case K_TARGET % MAGICSLOTS1:
if (name[0] == TARGET[0] && len == 1)
return TARGET_INDEX;
break;
case K_OODATE % MAGICSLOTS1:
if (name[0] == OODATE[0] && len == 1)
return OODATE_INDEX;
break;
case K_ALLSRC % MAGICSLOTS1:
if (name[0] == ALLSRC[0] && len == 1)
return ALLSRC_INDEX;
break;
case K_IMPSRC % MAGICSLOTS1:
if (name[0] == IMPSRC[0] && len == 1)
return IMPSRC_INDEX;
break;
case K_PREFIX % MAGICSLOTS1:
if (name[0] == PREFIX[0] && len == 1)
return PREFIX_INDEX;
break;
case K_ARCHIVE % MAGICSLOTS1:
if (name[0] == ARCHIVE[0] && len == 1)
return ARCHIVE_INDEX;
break;
case K_MEMBER % MAGICSLOTS1:
if (name[0] == MEMBER[0] && len == 1)
return MEMBER_INDEX;
break;
case K_FTARGET % MAGICSLOTS1:
if (name[0] == FTARGET[0] && name[1] == FTARGET[1] && len == 2)
return FTARGET_INDEX;
break;
case K_DTARGET % MAGICSLOTS1:
if (name[0] == DTARGET[0] && name[1] == DTARGET[1] && len == 2)
return DTARGET_INDEX;
break;
case K_FPREFIX % MAGICSLOTS1:
if (name[0] == FPREFIX[0] && name[1] == FPREFIX[1] && len == 2)
return FPREFIX_INDEX;
break;
case K_DPREFIX % MAGICSLOTS1:
if (name[0] == DPREFIX[0] && name[1] == DPREFIX[1] && len == 2)
return DPREFIX_INDEX;
break;
case K_FARCHIVE % MAGICSLOTS1:
if (name[0] == FARCHIVE[0] && name[1] == FARCHIVE[1] &&
len == 2)
return FARCHIVE_INDEX;
break;
case K_DARCHIVE % MAGICSLOTS1:
if (name[0] == DARCHIVE[0] && name[1] == DARCHIVE[1] &&
len == 2)
return DARCHIVE_INDEX;
break;
case K_FMEMBER % MAGICSLOTS1:
if (name[0] == FMEMBER[0] && name[1] == FMEMBER[1] && len == 2)
return FMEMBER_INDEX;
break;
case K_DMEMBER % MAGICSLOTS1:
if (name[0] == DMEMBER[0] && name[1] == DMEMBER[1] && len == 2)
return DMEMBER_INDEX;
break;
case K_FIMPSRC % MAGICSLOTS1:
if (name[0] == FIMPSRC[0] && name[1] == FIMPSRC[1] && len == 2)
return FIMPSRC_INDEX;
break;
case K_DIMPSRC % MAGICSLOTS1:
if (name[0] == DIMPSRC[0] && name[1] == DIMPSRC[1] && len == 2)
return DIMPSRC_INDEX;
break;
default:
break;
}
return GLOBAL_INDEX;
}
/***
*** Internal handling of variables.
***/
/* Create a new variable, does not initialize anything except the name.
* in particular, buffer is invalid, and flag value is invalid. Accordingly,
* must either:
* - set flags to VAR_DUMMY
* - set flags to !VAR_DUMMY, and initialize buffer, for instance with
* var_set_initial_value().
*/
static Var *
create_var(const char *name, const char *ename)
{
return ohash_create_entry(&var_info, name, &ename);
}
/* Initial version of var_set_value(), to be called after create_var().
*/
static void
var_set_initial_value(Var *v, const char *val)
{
size_t len;
len = strlen(val);
Buf_Init(&(v->val), len+1);
Buf_AddChars(&(v->val), len, val);
}
/* Normal version of var_set_value(), to be called after variable is fully
* initialized.
*/
static void
var_set_value(Var *v, const char *val)
{
if ((v->flags & VAR_DUMMY) == 0) {
Buf_Reset(&(v->val));
Buf_AddString(&(v->val), val);
} else {
var_set_initial_value(v, val);
v->flags &= ~VAR_DUMMY;
}
}
/* Add to a variable, insert a separating space if the variable was already
* defined.
*/
static void
var_append_value(Var *v, const char *val)
{
if ((v->flags & VAR_DUMMY) == 0) {
Buf_AddSpace(&(v->val));
Buf_AddString(&(v->val), val);
} else {
var_set_initial_value(v, val);
v->flags &= ~VAR_DUMMY;
}
}
/* Delete a variable and all the space associated with it.
*/
static void
delete_var(Var *v)
{
if ((v->flags & VAR_DUMMY) == 0)
Buf_Destroy(&(v->val));
free(v);
}
/***
*** Dynamic variable handling.
***/
/* create empty symtable.
* XXX: to save space, dynamic variables may be NULL pointers.
*/
void
SymTable_Init(SymTable *ctxt)
{
static SymTable sym_template;
memcpy(ctxt, &sym_template, sizeof(*ctxt));
}
/***
*** Global variable handling.
***/
/* Create a new global var if necessary, and set it up correctly.
* Do not take environment into account.
*/
static Var *
find_global_var_without_env(const char *name, const char *ename, uint32_t k)
{
unsigned int slot;
Var *v;
slot = ohash_lookup_interval(&global_variables, name, ename, k);
v = ohash_find(&global_variables, slot);
if (v == NULL) {
v = create_var(name, ename);
v->flags = VAR_DUMMY;
ohash_insert(&global_variables, slot, v);
}
return v;
}
/* Helper for find_global_var(): grab environment value if needed.
*/
static void
fill_from_env(Var *v)
{
char *env;
env = getenv(v->name);
if (env == NULL)
v->flags |= VAR_SEEN_ENV;
else {
var_set_value(v, env);
v->flags |= VAR_FROM_ENV | VAR_SEEN_ENV;
}
#ifdef STATS_VAR_LOOKUP
STAT_VAR_FROM_ENV++;
#endif
}
/* Find global var, and obtain its value from the environment if needed.
*/
static Var *
find_global_var(const char *name, const char *ename, uint32_t k)
{
Var *v;
v = find_global_var_without_env(name, ename, k);
if ((v->flags & VAR_SEEN_ENV) == 0)
if ((checkEnvFirst && (v->flags & VAR_FROM_CMD) == 0) ||
(v->flags & VAR_DUMMY) != 0)
fill_from_env(v);
return v;
}
/* mark variable with special flags, in a given setup.
*/
void
Var_Mark(const char *name, const char *ename, unsigned int type)
{
Var *v;
uint32_t k;
int idx;
idx = classify_var(name, &ename, &k);
if (idx != GLOBAL_INDEX) {
Parse_Error(PARSE_FATAL,
"Trying to poison dynamic variable $%s",
varnames[idx]);
return;
}
v = find_global_var(name, ename, k);
v->flags |= type;
/* POISON_NORMAL is not lazy: if the variable already exists in
* the Makefile, then it's a mistake.
*/
if (v->flags & POISON_NORMAL) {
if (v->flags & VAR_DUMMY)
return;
if (v->flags & VAR_FROM_ENV)
return;
Parse_Error(PARSE_FATAL,
"Poisoned variable %s is already set\n", v->name);
}
}
/* Check if there's any reason not to use this variable.
*/
static void
poison_check(Var *v)
{
if (v->flags & POISON_NORMAL) {
Parse_Error(PARSE_FATAL,
"Poisoned variable %s has been referenced\n", v->name);
return;
}
if (v->flags & VAR_DUMMY) {
Parse_Error(PARSE_FATAL,
"Poisoned variable %s is not defined\n", v->name);
return;
}
if (v->flags & POISON_EMPTY)
if (strcmp(var_get_value(v), "") == 0)
Parse_Error(PARSE_FATAL,
"Poisoned variable %s is empty\n", v->name);
}
/* Delete global variable.
*/
void
Var_Deletei(const char *name, const char *ename)
{
Var *v;
uint32_t k;
unsigned int slot;
int idx;
idx = classify_var(name, &ename, &k);
if (idx != GLOBAL_INDEX) {
Parse_Error(PARSE_FATAL,
"Trying to delete dynamic variable $%s", varnames[idx]);
return;
}
slot = ohash_lookup_interval(&global_variables, name, ename, k);
v = ohash_find(&global_variables, slot);
if (v == NULL)
return;
if (checkEnvFirst && (v->flags & VAR_FROM_ENV))
return;
if (v->flags & VAR_FROM_CMD)
return;
ohash_remove(&global_variables, slot);
delete_var(v);
}
/* Set or add a global variable, either to VAR_CMD or VAR_GLOBAL.
*/
static void
var_set_append(const char *name, const char *ename, const char *val, int ctxt,
bool append)
{
Var *v;
uint32_t k;
int idx;
idx = classify_var(name, &ename, &k);
if (idx != GLOBAL_INDEX) {
Parse_Error(PARSE_FATAL, "Trying to %s dynamic variable $%s",
append ? "append to" : "set", varnames[idx]);
return;
}
v = find_global_var(name, ename, k);
if (v->flags & POISON_NORMAL)
Parse_Error(PARSE_FATAL, "Trying to %s poisoned variable %s\n",
append ? "append to" : "set", v->name);
/* so can we write to it ? */
if (ctxt == VAR_CMD) { /* always for command line */
(append ? var_append_value : var_set_value)(v, val);
v->flags |= VAR_FROM_CMD;
if ((v->flags & VAR_IS_SHELL) == 0) {
/* Any variables given on the command line are
* automatically exported to the environment,
* except for SHELL (as per POSIX standard).
*/
esetenv(v->name, val);
}
if (DEBUG(VAR))
printf("command:%s = %s\n", v->name, var_get_value(v));
} else if ((v->flags & VAR_FROM_CMD) == 0 &&
(!checkEnvFirst || (v->flags & VAR_FROM_ENV) == 0)) {
(append ? var_append_value : var_set_value)(v, val);
if (DEBUG(VAR))
printf("global:%s = %s\n", v->name, var_get_value(v));
} else if (DEBUG(VAR))
printf("overridden:%s = %s\n", v->name, var_get_value(v));
}
void
Var_Seti_with_ctxt(const char *name, const char *ename, const char *val,
int ctxt)
{
var_set_append(name, ename, val, ctxt, false);
}
void
Var_Appendi_with_ctxt(const char *name, const char *ename, const char *val,
int ctxt)
{
var_set_append(name, ename, val, ctxt, true);
}
static char *
var_exec_cmd(Var *v)
{
char *arg = Buf_Retrieve(&(v->val));
char *err;
char *res1;
res1 = Cmd_Exec(arg, &err);
if (err)
Parse_Error(PARSE_WARNING, err, arg);
var_set_value(v, res1);
free(res1);
v->flags &= ~VAR_EXEC_LATER;
return Buf_Retrieve(&(v->val));
}
/* XXX different semantics for Var_Valuei() and Var_Definedi():
* references to poisoned value variables will error out in Var_Valuei(),
* but not in Var_Definedi(), so the following construct works:
* .poison BINDIR
* BINDIR ?= /usr/bin
*/
char *
Var_Valuei(const char *name, const char *ename)
{
Var *v;
uint32_t k;
int idx;
idx = classify_var(name, &ename, &k);
if (idx != GLOBAL_INDEX) {
Parse_Error(PARSE_FATAL,
"Trying to get value of dynamic variable $%s",
varnames[idx]);
return NULL;
}
v = find_global_var(name, ename, k);
if (v->flags & POISONS)
poison_check(v);
if ((v->flags & VAR_DUMMY) == 0)
return var_get_value(v);
else
return NULL;
}
bool
Var_Definedi(const char *name, const char *ename)
{
Var *v;
uint32_t k;
int idx;
idx = classify_var(name, &ename, &k);
/* We don't bother writing an error message for dynamic variables,
* these will be caught when getting set later, usually.
*/
if (idx == GLOBAL_INDEX) {
v = find_global_var(name, ename, k);
if (v->flags & POISON_NORMAL)
poison_check(v);
if ((v->flags & VAR_DUMMY) == 0)
return true;
}
return false;
}
/***
*** Substitution functions, handling both global and dynamic variables.
***/
/* All the scanning functions needed to account for all the forms of
* variable names that exist:
* $A, ${AB}, $(ABC), ${A:mod}, $(A:mod)
*/
static const char *
find_rparen(const char *p)
{
while (*p != '$' && *p != '\0' && *p != ')' && *p != ':')
p++;
return p;
}
static const char *
find_ket(const char *p)
{
while (*p != '$' && *p != '\0' && *p != '}' && *p != ':')
p++;
return p;
}
/* Figure out what kind of name we're looking for from a start character.
*/
static find_t
find_pos(int c)
{
switch(c) {
case '(':
return find_rparen;
case '{':
return find_ket;
default:
Parse_Error(PARSE_FATAL,
"Wrong character in variable spec %c (can't happen)", c);
return find_rparen;
}
}
static bool
parse_base_variable_name(const char **pstr, struct Name *name, SymTable *ctxt)
{
const char *str = *pstr;
const char *tstr;
bool has_modifier = false;
switch(str[1]) {
case '(':
case '{':
/* Find eventual modifiers in the variable */
tstr = VarName_Get(str+2, name, ctxt, false, find_pos(str[1]));
if (*tstr == '\0')
Parse_Error(PARSE_FATAL, "Unterminated variable spec in %s", *pstr);
else if (*tstr == ':')
has_modifier = true;
else
tstr++;
break;
default:
name->s = str+1;
name->e = str+2;
name->tofree = false;
tstr = str + 2;
break;
}
*pstr = tstr;
return has_modifier;
}
bool
Var_ParseSkip(const char **pstr, SymTable *ctxt)
{
const char *str = *pstr;
struct Name name;
bool result;
bool has_modifier;
const char *tstr = str;
if (str[1] == 0) {
*pstr = str+1;
return false;
}
has_modifier = parse_base_variable_name(&tstr, &name, ctxt);
VarName_Free(&name);
result = true;
if (has_modifier) {
bool freePtr = false;
char *s = VarModifiers_Apply(NULL, NULL, ctxt, true, &freePtr,
&tstr, str[1]);
if (s == var_Error)
result = false;
if (freePtr)
free(s);
}
*pstr = tstr;
return result;
}
/* As of now, Var_ParseBuffer is just a wrapper around Var_Parse. For
* speed, it may be better to revisit the implementation to do things
* directly. */
bool
Var_ParseBuffer(Buffer buf, const char *str, SymTable *ctxt, bool err,
size_t *lengthPtr)
{
char *result;
bool freeIt;
result = Var_Parse(str, ctxt, err, lengthPtr, &freeIt);
if (result == var_Error)
return false;
Buf_AddString(buf, result);
if (freeIt)
free(result);
return true;
}
/* Helper function for Var_Parse: still recursive, but we tag what variables
* we expand for better error messages.
*/
#define MAX_DEPTH 350
static Var *call_trace[MAX_DEPTH];
static int current_depth = 0;
static void
push_used(Var *v)
{
if (v->flags & VAR_IN_USE) {
int i;
fprintf(stderr, "Problem with variable expansion chain: ");
for (i = 0;
i < (current_depth > MAX_DEPTH ? MAX_DEPTH : current_depth);
i++)
fprintf(stderr, "%s -> ", call_trace[i]->name);
fprintf(stderr, "%s\n", v->name);
Fatal("\tVariable %s is recursive.", v->name);
/*NOTREACHED*/
}
v->flags |= VAR_IN_USE;
if (current_depth < MAX_DEPTH)
call_trace[current_depth] = v;
current_depth++;
}
static void
pop_used(Var *v)
{
v->flags &= ~VAR_IN_USE;
current_depth--;
}
static char *
get_expanded_value(const char *name, const char *ename, int idx, uint32_t k,
SymTable *ctxt, bool err, bool *freePtr)
{
char *val;
/* Before doing any modification, we have to make sure the
* value has been fully expanded. If it looks like recursion
* might be necessary (there's a dollar sign somewhere in
* the variable's value) we just call Var_Subst to do any
* other substitutions that are necessary. Note that the
* value returned by Var_Subst will have been dynamically
* allocated, so it will need freeing when we return.
*/
if (idx == GLOBAL_INDEX) {
Var *v = find_global_var(name, ename, k);
if (v == NULL)
return NULL;
if ((v->flags & POISONS) != 0)
poison_check(v);
if ((v->flags & VAR_DUMMY) != 0)
return NULL;
val = var_get_value(v);
if (strchr(val, '$') != NULL) {
push_used(v);
val = Var_Subst(val, ctxt, err);
pop_used(v);
*freePtr = true;
}
} else {
if (ctxt != NULL) {
if (idx < LOCAL_SIZE)
val = ctxt->locals[idx];
else
val = ctxt->locals[EXTENDED2SIMPLE(idx)];
} else
val = NULL;
if (val == NULL)
return NULL;
if (idx >= LOCAL_SIZE) {
if (IS_EXTENDED_F(idx))
val = Var_GetTail(val);
else
val = Var_GetHead(val);
*freePtr = true;
}
}
return val;
}
#define ERRMSG1 "Using $< in a non-suffix rule context is a GNUmake idiom "
#define ERRMSG2 "Using undefined dynamic variable $%s "
static void
bad_dynamic_variable(int idx)
{
Location origin;
Parse_FillLocation(&origin);
if (idx >= LOCAL_SIZE)
idx = EXTENDED2SIMPLE(idx);
switch(idx) {
case IMPSRC_INDEX:
if (origin.fname)
Fatal(ERRMSG1 "(%s:%lu)",
origin.fname, origin.lineno);
else if (current_node)
Fatal(ERRMSG1 "(prereq of %s)", current_node->name);
else
Fatal(ERRMSG1 "(?)");
break;
default:
if (origin.fname)
Error(ERRMSG2 "(%s:%lu)", varnames[idx],
origin.fname, origin.lineno);
else if (current_node)
Error(ERRMSG2 "(prereq of %s)", varnames[idx],
current_node->name);
else
Error(ERRMSG2 "(?)", varnames[idx]);
break;
}
}
char *
Var_Parse(const char *str, /* The string to parse */
SymTable *ctxt, /* The context for the variable */
bool err, /* true if undefined variables are an error */