1369 lines
33 KiB
C
1369 lines
33 KiB
C
/* $NetBSD: cond.c,v 1.267 2021/06/11 14:52:03 rillig Exp $ */
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/*
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* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1988, 1989 by Adam de Boor
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* Copyright (c) 1989 by Berkeley Softworks
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
|
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Handling of conditionals in a makefile.
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*
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* Interface:
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* Cond_EvalLine Evaluate the conditional directive, such as
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* '.if <cond>', '.elifnmake <cond>', '.else', '.endif'.
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*
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* Cond_EvalCondition
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* Evaluate the conditional, which is either the argument
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* of one of the .if directives or the condition in a
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* ':?then:else' variable modifier.
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*
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* Cond_save_depth
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* Cond_restore_depth
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* Save and restore the nesting of the conditions, at
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* the start and end of including another makefile, to
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* ensure that in each makefile the conditional
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* directives are well-balanced.
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*/
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#include <errno.h>
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#include "make.h"
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#include "dir.h"
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/* "@(#)cond.c 8.2 (Berkeley) 1/2/94" */
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MAKE_RCSID("$NetBSD: cond.c,v 1.267 2021/06/11 14:52:03 rillig Exp $");
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/*
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* The parsing of conditional expressions is based on this grammar:
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* Or -> And '||' Or
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* Or -> And
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* And -> Term '&&' And
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* And -> Term
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* Term -> Function '(' Argument ')'
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* Term -> Leaf Operator Leaf
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* Term -> Leaf
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* Term -> '(' Or ')'
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* Term -> '!' Term
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* Leaf -> "string"
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* Leaf -> Number
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* Leaf -> VariableExpression
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* Leaf -> Symbol
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* Operator -> '==' | '!=' | '>' | '<' | '>=' | '<='
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*
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* 'Symbol' is an unquoted string literal to which the default function is
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* applied.
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*
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* The tokens are scanned by CondToken, which returns:
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* TOK_AND for '&&'
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* TOK_OR for '||'
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* TOK_NOT for '!'
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* TOK_LPAREN for '('
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* TOK_RPAREN for ')'
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*
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* Other terminal symbols are evaluated using either the default function or
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* the function given in the terminal, they return either TOK_TRUE or
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* TOK_FALSE.
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*/
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typedef enum Token {
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TOK_FALSE, TOK_TRUE, TOK_AND, TOK_OR, TOK_NOT,
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TOK_LPAREN, TOK_RPAREN, TOK_EOF, TOK_NONE, TOK_ERROR
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} Token;
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typedef enum CondResult {
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CR_FALSE, CR_TRUE, CR_ERROR
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} CondResult;
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typedef enum ComparisonOp {
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LT, LE, GT, GE, EQ, NE
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} ComparisonOp;
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typedef struct CondParser {
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/*
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* The plain '.if ${VAR}' evaluates to true if the value of the
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* expression has length > 0. The other '.if' variants delegate
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* to evalBare instead.
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*/
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bool plain;
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/* The function to apply on unquoted bare words. */
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bool (*evalBare)(size_t, const char *);
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bool negateEvalBare;
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const char *p; /* The remaining condition to parse */
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Token curr; /* Single push-back token used in parsing */
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/*
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* Whether an error message has already been printed for this
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* condition. The first available error message is usually the most
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* specific one, therefore it makes sense to suppress the standard
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* "Malformed conditional" message.
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*/
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bool printedError;
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} CondParser;
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static CondResult CondParser_Or(CondParser *par, bool);
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static unsigned int cond_depth = 0; /* current .if nesting level */
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static unsigned int cond_min_depth = 0; /* depth at makefile open */
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static const char *opname[] = { "<", "<=", ">", ">=", "==", "!=" };
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/*
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* Indicate when we should be strict about lhs of comparisons.
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* In strict mode, the lhs must be a variable expression or a string literal
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* in quotes. In non-strict mode it may also be an unquoted string literal.
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*
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* True when CondEvalExpression is called from Cond_EvalLine (.if etc).
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* False when CondEvalExpression is called from ApplyModifier_IfElse
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* since lhs is already expanded, and at that point we cannot tell if
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* it was a variable reference or not.
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*/
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static bool lhsStrict;
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static bool
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is_token(const char *str, const char *tok, size_t len)
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{
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return strncmp(str, tok, len) == 0 && !ch_isalpha(str[len]);
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}
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static Token
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ToToken(bool cond)
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{
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return cond ? TOK_TRUE : TOK_FALSE;
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}
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/* Push back the most recent token read. We only need one level of this. */
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static void
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CondParser_PushBack(CondParser *par, Token t)
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{
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assert(par->curr == TOK_NONE);
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assert(t != TOK_NONE);
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par->curr = t;
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}
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static void
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CondParser_SkipWhitespace(CondParser *par)
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{
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cpp_skip_whitespace(&par->p);
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}
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/*
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* Parse the argument of a built-in function.
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*
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* Arguments:
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* *pp initially points at the '(',
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* upon successful return it points right after the ')'.
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*
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* *out_arg receives the argument as string.
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*
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* func says whether the argument belongs to an actual function, or
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* whether the parsed argument is passed to the default function.
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*
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* Return the length of the argument, or 0 on error.
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*/
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static size_t
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ParseFuncArg(CondParser *par, const char **pp, bool doEval, const char *func,
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char **out_arg)
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{
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const char *p = *pp;
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Buffer argBuf;
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int paren_depth;
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size_t argLen;
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if (func != NULL)
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p++; /* Skip opening '(' - verified by caller */
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if (*p == '\0') {
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*out_arg = NULL; /* Missing closing parenthesis: */
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return 0; /* .if defined( */
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}
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cpp_skip_hspace(&p);
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Buf_InitSize(&argBuf, 16);
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paren_depth = 0;
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for (;;) {
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char ch = *p;
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if (ch == '\0' || ch == ' ' || ch == '\t')
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break;
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if ((ch == '&' || ch == '|') && paren_depth == 0)
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break;
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if (*p == '$') {
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/*
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* Parse the variable expression and install it as
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* part of the argument if it's valid. We tell
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* Var_Parse to complain on an undefined variable,
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* (XXX: but Var_Parse ignores that request)
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* so we don't need to do it. Nor do we return an
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* error, though perhaps we should.
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*/
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VarEvalMode emode = doEval
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? VARE_UNDEFERR
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: VARE_PARSE_ONLY;
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FStr nestedVal;
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(void)Var_Parse(&p, SCOPE_CMDLINE, emode, &nestedVal);
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/* TODO: handle errors */
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Buf_AddStr(&argBuf, nestedVal.str);
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FStr_Done(&nestedVal);
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continue;
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}
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if (ch == '(')
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paren_depth++;
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else if (ch == ')' && --paren_depth < 0)
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break;
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Buf_AddByte(&argBuf, *p);
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p++;
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}
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argLen = argBuf.len;
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*out_arg = Buf_DoneData(&argBuf);
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cpp_skip_hspace(&p);
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if (func != NULL && *p++ != ')') {
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Parse_Error(PARSE_FATAL,
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"Missing closing parenthesis for %s()", func);
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par->printedError = true;
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return 0;
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}
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*pp = p;
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return argLen;
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}
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/* Test whether the given variable is defined. */
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/*ARGSUSED*/
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static bool
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FuncDefined(size_t argLen MAKE_ATTR_UNUSED, const char *arg)
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{
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FStr value = Var_Value(SCOPE_CMDLINE, arg);
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bool result = value.str != NULL;
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FStr_Done(&value);
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return result;
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}
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/* See if the given target is being made. */
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/*ARGSUSED*/
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static bool
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FuncMake(size_t argLen MAKE_ATTR_UNUSED, const char *arg)
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{
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StringListNode *ln;
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for (ln = opts.create.first; ln != NULL; ln = ln->next)
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if (Str_Match(ln->datum, arg))
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return true;
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return false;
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}
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/* See if the given file exists. */
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/*ARGSUSED*/
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static bool
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FuncExists(size_t argLen MAKE_ATTR_UNUSED, const char *arg)
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{
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bool result;
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char *path;
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path = Dir_FindFile(arg, &dirSearchPath);
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DEBUG2(COND, "exists(%s) result is \"%s\"\n",
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arg, path != NULL ? path : "");
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result = path != NULL;
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free(path);
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return result;
|
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}
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|
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/* See if the given node exists and is an actual target. */
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/*ARGSUSED*/
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static bool
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FuncTarget(size_t argLen MAKE_ATTR_UNUSED, const char *arg)
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{
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GNode *gn = Targ_FindNode(arg);
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return gn != NULL && GNode_IsTarget(gn);
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}
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|
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/*
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* See if the given node exists and is an actual target with commands
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* associated with it.
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*/
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/*ARGSUSED*/
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static bool
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FuncCommands(size_t argLen MAKE_ATTR_UNUSED, const char *arg)
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{
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GNode *gn = Targ_FindNode(arg);
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return gn != NULL && GNode_IsTarget(gn) && !Lst_IsEmpty(&gn->commands);
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}
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|
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/*
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* Convert the given number into a double.
|
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* We try a base 10 or 16 integer conversion first, if that fails
|
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* then we try a floating point conversion instead.
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*
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* Results:
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* Returns true if the conversion succeeded.
|
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* Sets 'out_value' to the converted number.
|
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*/
|
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static bool
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TryParseNumber(const char *str, double *out_value)
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{
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char *end;
|
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unsigned long ul_val;
|
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double dbl_val;
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errno = 0;
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if (str[0] == '\0') { /* XXX: why is an empty string a number? */
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*out_value = 0.0;
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return true;
|
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}
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|
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ul_val = strtoul(str, &end, str[1] == 'x' ? 16 : 10);
|
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if (*end == '\0' && errno != ERANGE) {
|
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*out_value = str[0] == '-' ? -(double)-ul_val : (double)ul_val;
|
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return true;
|
|
}
|
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|
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if (*end != '\0' && *end != '.' && *end != 'e' && *end != 'E')
|
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return false; /* skip the expensive strtod call */
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dbl_val = strtod(str, &end);
|
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if (*end != '\0')
|
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return false;
|
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|
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*out_value = dbl_val;
|
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return true;
|
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}
|
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|
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static bool
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is_separator(char ch)
|
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{
|
|
return ch == '\0' || ch_isspace(ch) || ch == '!' || ch == '=' ||
|
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ch == '>' || ch == '<' || ch == ')' /* but not '(' */;
|
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}
|
|
|
|
/*
|
|
* In a quoted or unquoted string literal or a number, parse a variable
|
|
* expression.
|
|
*
|
|
* Example: .if x${CENTER}y == "${PREFIX}${SUFFIX}" || 0x${HEX}
|
|
*/
|
|
static bool
|
|
CondParser_StringExpr(CondParser *par, const char *start,
|
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bool const doEval, bool const quoted,
|
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Buffer *buf, FStr *const inout_str)
|
|
{
|
|
VarEvalMode emode;
|
|
const char *nested_p;
|
|
bool atStart;
|
|
VarParseResult parseResult;
|
|
|
|
/* if we are in quotes, an undefined variable is ok */
|
|
emode = doEval && !quoted ? VARE_UNDEFERR
|
|
: doEval ? VARE_WANTRES
|
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: VARE_PARSE_ONLY;
|
|
|
|
nested_p = par->p;
|
|
atStart = nested_p == start;
|
|
parseResult = Var_Parse(&nested_p, SCOPE_CMDLINE, emode, inout_str);
|
|
/* TODO: handle errors */
|
|
if (inout_str->str == var_Error) {
|
|
if (parseResult == VPR_ERR) {
|
|
/*
|
|
* FIXME: Even if an error occurs, there is no
|
|
* guarantee that it is reported.
|
|
*
|
|
* See cond-token-plain.mk $$$$$$$$.
|
|
*/
|
|
par->printedError = true;
|
|
}
|
|
/*
|
|
* XXX: Can there be any situation in which a returned
|
|
* var_Error needs to be freed?
|
|
*/
|
|
FStr_Done(inout_str);
|
|
/*
|
|
* Even if !doEval, we still report syntax errors, which is
|
|
* what getting var_Error back with !doEval means.
|
|
*/
|
|
*inout_str = FStr_InitRefer(NULL);
|
|
return false;
|
|
}
|
|
par->p = nested_p;
|
|
|
|
/*
|
|
* If the '$' started the string literal (which means no quotes), and
|
|
* the variable expression is followed by a space, looks like a
|
|
* comparison operator or is the end of the expression, we are done.
|
|
*/
|
|
if (atStart && is_separator(par->p[0]))
|
|
return false;
|
|
|
|
Buf_AddStr(buf, inout_str->str);
|
|
FStr_Done(inout_str);
|
|
*inout_str = FStr_InitRefer(NULL); /* not finished yet */
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Parse a string from a variable expression or an optionally quoted
|
|
* string. This is called for the left-hand and right-hand sides of
|
|
* comparisons.
|
|
*
|
|
* Results:
|
|
* Returns the string, absent any quotes, or NULL on error.
|
|
* Sets out_quoted if the leaf was a quoted string literal.
|
|
*/
|
|
static void
|
|
CondParser_Leaf(CondParser *par, bool doEval, bool strictLHS,
|
|
FStr *out_str, bool *out_quoted)
|
|
{
|
|
Buffer buf;
|
|
FStr str;
|
|
bool quoted;
|
|
const char *start;
|
|
|
|
Buf_Init(&buf);
|
|
str = FStr_InitRefer(NULL);
|
|
*out_quoted = quoted = par->p[0] == '"';
|
|
start = par->p;
|
|
if (quoted)
|
|
par->p++;
|
|
|
|
while (par->p[0] != '\0' && str.str == NULL) {
|
|
switch (par->p[0]) {
|
|
case '\\':
|
|
par->p++;
|
|
if (par->p[0] != '\0') {
|
|
Buf_AddByte(&buf, par->p[0]);
|
|
par->p++;
|
|
}
|
|
continue;
|
|
case '"':
|
|
par->p++;
|
|
if (quoted)
|
|
goto got_str; /* skip the closing quote */
|
|
Buf_AddByte(&buf, '"');
|
|
continue;
|
|
case ')': /* see is_separator */
|
|
case '!':
|
|
case '=':
|
|
case '>':
|
|
case '<':
|
|
case ' ':
|
|
case '\t':
|
|
if (!quoted)
|
|
goto got_str;
|
|
Buf_AddByte(&buf, par->p[0]);
|
|
par->p++;
|
|
continue;
|
|
case '$':
|
|
if (!CondParser_StringExpr(par,
|
|
start, doEval, quoted, &buf, &str))
|
|
goto cleanup;
|
|
continue;
|
|
default:
|
|
if (strictLHS && !quoted && *start != '$' &&
|
|
!ch_isdigit(*start)) {
|
|
/*
|
|
* The left-hand side must be quoted,
|
|
* a variable reference or a number.
|
|
*/
|
|
str = FStr_InitRefer(NULL);
|
|
goto cleanup;
|
|
}
|
|
Buf_AddByte(&buf, par->p[0]);
|
|
par->p++;
|
|
continue;
|
|
}
|
|
}
|
|
got_str:
|
|
str = FStr_InitOwn(buf.data);
|
|
cleanup:
|
|
Buf_DoneData(&buf); /* XXX: memory leak on failure? */
|
|
*out_str = str;
|
|
}
|
|
|
|
static bool
|
|
EvalBare(const CondParser *par, const char *arg, size_t arglen)
|
|
{
|
|
bool res = par->evalBare(arglen, arg);
|
|
return par->negateEvalBare ? !res : res;
|
|
}
|
|
|
|
/*
|
|
* Evaluate a "comparison without operator", such as in ".if ${VAR}" or
|
|
* ".if 0".
|
|
*/
|
|
static bool
|
|
EvalNotEmpty(CondParser *par, const char *value, bool quoted)
|
|
{
|
|
double num;
|
|
|
|
/* For .ifxxx "...", check for non-empty string. */
|
|
if (quoted)
|
|
return value[0] != '\0';
|
|
|
|
/* For .ifxxx <number>, compare against zero */
|
|
if (TryParseNumber(value, &num))
|
|
return num != 0.0;
|
|
|
|
/* For .if ${...}, check for non-empty string. This is different from
|
|
* the evaluation function from that .if variant, which would test
|
|
* whether a variable of the given name were defined. */
|
|
/* XXX: Whitespace should count as empty, just as in ParseEmptyArg. */
|
|
if (par->plain)
|
|
return value[0] != '\0';
|
|
|
|
return EvalBare(par, value, strlen(value));
|
|
}
|
|
|
|
/* Evaluate a numerical comparison, such as in ".if ${VAR} >= 9". */
|
|
static bool
|
|
EvalCompareNum(double lhs, ComparisonOp op, double rhs)
|
|
{
|
|
DEBUG3(COND, "lhs = %f, rhs = %f, op = %.2s\n", lhs, rhs, opname[op]);
|
|
|
|
switch (op) {
|
|
case LT:
|
|
return lhs < rhs;
|
|
case LE:
|
|
return lhs <= rhs;
|
|
case GT:
|
|
return lhs > rhs;
|
|
case GE:
|
|
return lhs >= rhs;
|
|
case NE:
|
|
return lhs != rhs;
|
|
default:
|
|
return lhs == rhs;
|
|
}
|
|
}
|
|
|
|
static Token
|
|
EvalCompareStr(CondParser *par, const char *lhs,
|
|
ComparisonOp op, const char *rhs)
|
|
{
|
|
if (op != EQ && op != NE) {
|
|
Parse_Error(PARSE_FATAL,
|
|
"String comparison operator must be either == or !=");
|
|
par->printedError = true;
|
|
return TOK_ERROR;
|
|
}
|
|
|
|
DEBUG3(COND, "lhs = \"%s\", rhs = \"%s\", op = %.2s\n",
|
|
lhs, rhs, opname[op]);
|
|
return ToToken((op == EQ) == (strcmp(lhs, rhs) == 0));
|
|
}
|
|
|
|
/* Evaluate a comparison, such as "${VAR} == 12345". */
|
|
static Token
|
|
EvalCompare(CondParser *par, const char *lhs, bool lhsQuoted,
|
|
ComparisonOp op, const char *rhs, bool rhsQuoted)
|
|
{
|
|
double left, right;
|
|
|
|
if (!rhsQuoted && !lhsQuoted)
|
|
if (TryParseNumber(lhs, &left) && TryParseNumber(rhs, &right))
|
|
return ToToken(EvalCompareNum(left, op, right));
|
|
|
|
return EvalCompareStr(par, lhs, op, rhs);
|
|
}
|
|
|
|
static bool
|
|
CondParser_ComparisonOp(CondParser *par, ComparisonOp *out_op)
|
|
{
|
|
const char *p = par->p;
|
|
|
|
if (p[0] == '<' && p[1] == '=') {
|
|
*out_op = LE;
|
|
goto length_2;
|
|
} else if (p[0] == '<') {
|
|
*out_op = LT;
|
|
goto length_1;
|
|
} else if (p[0] == '>' && p[1] == '=') {
|
|
*out_op = GE;
|
|
goto length_2;
|
|
} else if (p[0] == '>') {
|
|
*out_op = GT;
|
|
goto length_1;
|
|
} else if (p[0] == '=' && p[1] == '=') {
|
|
*out_op = EQ;
|
|
goto length_2;
|
|
} else if (p[0] == '!' && p[1] == '=') {
|
|
*out_op = NE;
|
|
goto length_2;
|
|
}
|
|
return false;
|
|
|
|
length_2:
|
|
par->p = p + 2;
|
|
return true;
|
|
length_1:
|
|
par->p = p + 1;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Parse a comparison condition such as:
|
|
*
|
|
* 0
|
|
* ${VAR:Mpattern}
|
|
* ${VAR} == value
|
|
* ${VAR:U0} < 12345
|
|
*/
|
|
static Token
|
|
CondParser_Comparison(CondParser *par, bool doEval)
|
|
{
|
|
Token t = TOK_ERROR;
|
|
FStr lhs, rhs;
|
|
ComparisonOp op;
|
|
bool lhsQuoted, rhsQuoted;
|
|
|
|
/*
|
|
* Parse the variable spec and skip over it, saving its
|
|
* value in lhs.
|
|
*/
|
|
CondParser_Leaf(par, doEval, lhsStrict, &lhs, &lhsQuoted);
|
|
if (lhs.str == NULL)
|
|
goto done_lhs;
|
|
|
|
CondParser_SkipWhitespace(par);
|
|
|
|
if (!CondParser_ComparisonOp(par, &op)) {
|
|
/* Unknown operator, compare against an empty string or 0. */
|
|
t = ToToken(doEval && EvalNotEmpty(par, lhs.str, lhsQuoted));
|
|
goto done_lhs;
|
|
}
|
|
|
|
CondParser_SkipWhitespace(par);
|
|
|
|
if (par->p[0] == '\0') {
|
|
Parse_Error(PARSE_FATAL,
|
|
"Missing right-hand-side of operator '%s'", opname[op]);
|
|
par->printedError = true;
|
|
goto done_lhs;
|
|
}
|
|
|
|
CondParser_Leaf(par, doEval, false, &rhs, &rhsQuoted);
|
|
if (rhs.str == NULL)
|
|
goto done_rhs;
|
|
|
|
if (!doEval) {
|
|
t = TOK_FALSE;
|
|
goto done_rhs;
|
|
}
|
|
|
|
t = EvalCompare(par, lhs.str, lhsQuoted, op, rhs.str, rhsQuoted);
|
|
|
|
done_rhs:
|
|
FStr_Done(&rhs);
|
|
done_lhs:
|
|
FStr_Done(&lhs);
|
|
return t;
|
|
}
|
|
|
|
/*
|
|
* The argument to empty() is a variable name, optionally followed by
|
|
* variable modifiers.
|
|
*/
|
|
/*ARGSUSED*/
|
|
static size_t
|
|
ParseEmptyArg(CondParser *par MAKE_ATTR_UNUSED, const char **pp,
|
|
bool doEval, const char *func MAKE_ATTR_UNUSED,
|
|
char **out_arg)
|
|
{
|
|
FStr val;
|
|
size_t magic_res;
|
|
|
|
/* We do all the work here and return the result as the length */
|
|
*out_arg = NULL;
|
|
|
|
(*pp)--; /* Make (*pp)[1] point to the '('. */
|
|
(void)Var_Parse(pp, SCOPE_CMDLINE,
|
|
doEval ? VARE_WANTRES : VARE_PARSE_ONLY, &val);
|
|
/* TODO: handle errors */
|
|
/* If successful, *pp points beyond the closing ')' now. */
|
|
|
|
if (val.str == var_Error) {
|
|
FStr_Done(&val);
|
|
return (size_t)-1;
|
|
}
|
|
|
|
/*
|
|
* A variable is empty when it just contains spaces...
|
|
* 4/15/92, christos
|
|
*/
|
|
cpp_skip_whitespace(&val.str);
|
|
|
|
/*
|
|
* For consistency with the other functions we can't generate the
|
|
* true/false here.
|
|
*/
|
|
magic_res = val.str[0] != '\0' ? 2 : 1;
|
|
FStr_Done(&val);
|
|
return magic_res;
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static bool
|
|
FuncEmpty(size_t arglen, const char *arg MAKE_ATTR_UNUSED)
|
|
{
|
|
/* Magic values ahead, see ParseEmptyArg. */
|
|
return arglen == 1;
|
|
}
|
|
|
|
/* Parse a function call expression, such as 'defined(${file})'. */
|
|
static bool
|
|
CondParser_FuncCall(CondParser *par, bool doEval, Token *out_token)
|
|
{
|
|
static const struct fn_def {
|
|
const char *fn_name;
|
|
size_t fn_name_len;
|
|
size_t (*fn_parse)(CondParser *, const char **, bool,
|
|
const char *, char **);
|
|
bool (*fn_eval)(size_t, const char *);
|
|
} fns[] = {
|
|
{ "defined", 7, ParseFuncArg, FuncDefined },
|
|
{ "make", 4, ParseFuncArg, FuncMake },
|
|
{ "exists", 6, ParseFuncArg, FuncExists },
|
|
{ "empty", 5, ParseEmptyArg, FuncEmpty },
|
|
{ "target", 6, ParseFuncArg, FuncTarget },
|
|
{ "commands", 8, ParseFuncArg, FuncCommands }
|
|
};
|
|
const struct fn_def *fn;
|
|
char *arg = NULL;
|
|
size_t arglen;
|
|
const char *cp = par->p;
|
|
const struct fn_def *fns_end = fns + sizeof fns / sizeof fns[0];
|
|
|
|
for (fn = fns; fn != fns_end; fn++) {
|
|
if (!is_token(cp, fn->fn_name, fn->fn_name_len))
|
|
continue;
|
|
|
|
cp += fn->fn_name_len;
|
|
cpp_skip_whitespace(&cp);
|
|
if (*cp != '(')
|
|
break;
|
|
|
|
arglen = fn->fn_parse(par, &cp, doEval, fn->fn_name, &arg);
|
|
if (arglen == 0 || arglen == (size_t)-1) {
|
|
par->p = cp;
|
|
*out_token = arglen == 0 ? TOK_FALSE : TOK_ERROR;
|
|
return true;
|
|
}
|
|
|
|
/* Evaluate the argument using the required function. */
|
|
*out_token = ToToken(!doEval || fn->fn_eval(arglen, arg));
|
|
free(arg);
|
|
par->p = cp;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Parse a comparison such as '${VAR} == "value"', or a simple leaf without
|
|
* operator, which is a number, a variable expression or a string literal.
|
|
*/
|
|
static Token
|
|
CondParser_ComparisonOrLeaf(CondParser *par, bool doEval)
|
|
{
|
|
Token t;
|
|
char *arg = NULL;
|
|
size_t arglen;
|
|
const char *cp;
|
|
const char *cp1;
|
|
|
|
/* Push anything numeric through the compare expression */
|
|
cp = par->p;
|
|
if (ch_isdigit(cp[0]) || cp[0] == '-' || cp[0] == '+')
|
|
return CondParser_Comparison(par, doEval);
|
|
|
|
/*
|
|
* Most likely we have a naked token to apply the default function to.
|
|
* However ".if a == b" gets here when the "a" is unquoted and doesn't
|
|
* start with a '$'. This surprises people.
|
|
* If what follows the function argument is a '=' or '!' then the
|
|
* syntax would be invalid if we did "defined(a)" - so instead treat
|
|
* as an expression.
|
|
*/
|
|
/*
|
|
* XXX: Is it possible to have a variable expression evaluated twice
|
|
* at this point?
|
|
*/
|
|
arglen = ParseFuncArg(par, &cp, doEval, NULL, &arg);
|
|
cp1 = cp;
|
|
cpp_skip_whitespace(&cp1);
|
|
if (*cp1 == '=' || *cp1 == '!' || *cp1 == '<' || *cp1 == '>')
|
|
return CondParser_Comparison(par, doEval);
|
|
par->p = cp;
|
|
|
|
/*
|
|
* Evaluate the argument using the default function.
|
|
* This path always treats .if as .ifdef. To get here, the character
|
|
* after .if must have been taken literally, so the argument cannot
|
|
* be empty - even if it contained a variable expansion.
|
|
*/
|
|
t = ToToken(!doEval || EvalBare(par, arg, arglen));
|
|
free(arg);
|
|
return t;
|
|
}
|
|
|
|
/* Return the next token or comparison result from the parser. */
|
|
static Token
|
|
CondParser_Token(CondParser *par, bool doEval)
|
|
{
|
|
Token t;
|
|
|
|
t = par->curr;
|
|
if (t != TOK_NONE) {
|
|
par->curr = TOK_NONE;
|
|
return t;
|
|
}
|
|
|
|
cpp_skip_hspace(&par->p);
|
|
|
|
switch (par->p[0]) {
|
|
|
|
case '(':
|
|
par->p++;
|
|
return TOK_LPAREN;
|
|
|
|
case ')':
|
|
par->p++;
|
|
return TOK_RPAREN;
|
|
|
|
case '|':
|
|
par->p++;
|
|
if (par->p[0] == '|')
|
|
par->p++;
|
|
else if (opts.strict) {
|
|
Parse_Error(PARSE_FATAL, "Unknown operator '|'");
|
|
par->printedError = true;
|
|
return TOK_ERROR;
|
|
}
|
|
return TOK_OR;
|
|
|
|
case '&':
|
|
par->p++;
|
|
if (par->p[0] == '&')
|
|
par->p++;
|
|
else if (opts.strict) {
|
|
Parse_Error(PARSE_FATAL, "Unknown operator '&'");
|
|
par->printedError = true;
|
|
return TOK_ERROR;
|
|
}
|
|
return TOK_AND;
|
|
|
|
case '!':
|
|
par->p++;
|
|
return TOK_NOT;
|
|
|
|
case '#': /* XXX: see unit-tests/cond-token-plain.mk */
|
|
case '\n': /* XXX: why should this end the condition? */
|
|
/* Probably obsolete now, from 1993-03-21. */
|
|
case '\0':
|
|
return TOK_EOF;
|
|
|
|
case '"':
|
|
case '$':
|
|
return CondParser_Comparison(par, doEval);
|
|
|
|
default:
|
|
if (CondParser_FuncCall(par, doEval, &t))
|
|
return t;
|
|
return CondParser_ComparisonOrLeaf(par, doEval);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Term -> '(' Or ')'
|
|
* Term -> '!' Term
|
|
* Term -> Leaf Operator Leaf
|
|
* Term -> Leaf
|
|
*/
|
|
static CondResult
|
|
CondParser_Term(CondParser *par, bool doEval)
|
|
{
|
|
CondResult res;
|
|
Token t;
|
|
|
|
t = CondParser_Token(par, doEval);
|
|
if (t == TOK_TRUE)
|
|
return CR_TRUE;
|
|
if (t == TOK_FALSE)
|
|
return CR_FALSE;
|
|
|
|
if (t == TOK_LPAREN) {
|
|
res = CondParser_Or(par, doEval);
|
|
if (res == CR_ERROR)
|
|
return CR_ERROR;
|
|
if (CondParser_Token(par, doEval) != TOK_RPAREN)
|
|
return CR_ERROR;
|
|
return res;
|
|
}
|
|
|
|
if (t == TOK_NOT) {
|
|
res = CondParser_Term(par, doEval);
|
|
if (res == CR_TRUE)
|
|
res = CR_FALSE;
|
|
else if (res == CR_FALSE)
|
|
res = CR_TRUE;
|
|
return res;
|
|
}
|
|
|
|
return CR_ERROR;
|
|
}
|
|
|
|
/*
|
|
* And -> Term '&&' And
|
|
* And -> Term
|
|
*/
|
|
static CondResult
|
|
CondParser_And(CondParser *par, bool doEval)
|
|
{
|
|
CondResult res;
|
|
Token op;
|
|
|
|
res = CondParser_Term(par, doEval);
|
|
if (res == CR_ERROR)
|
|
return CR_ERROR;
|
|
|
|
op = CondParser_Token(par, doEval);
|
|
if (op == TOK_AND) {
|
|
if (res == CR_TRUE)
|
|
return CondParser_And(par, doEval);
|
|
if (CondParser_And(par, false) == CR_ERROR)
|
|
return CR_ERROR;
|
|
return res;
|
|
}
|
|
|
|
CondParser_PushBack(par, op);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Or -> And '||' Or
|
|
* Or -> And
|
|
*/
|
|
static CondResult
|
|
CondParser_Or(CondParser *par, bool doEval)
|
|
{
|
|
CondResult res;
|
|
Token op;
|
|
|
|
res = CondParser_And(par, doEval);
|
|
if (res == CR_ERROR)
|
|
return CR_ERROR;
|
|
|
|
op = CondParser_Token(par, doEval);
|
|
if (op == TOK_OR) {
|
|
if (res == CR_FALSE)
|
|
return CondParser_Or(par, doEval);
|
|
if (CondParser_Or(par, false) == CR_ERROR)
|
|
return CR_ERROR;
|
|
return res;
|
|
}
|
|
|
|
CondParser_PushBack(par, op);
|
|
return res;
|
|
}
|
|
|
|
static CondEvalResult
|
|
CondParser_Eval(CondParser *par, bool *out_value)
|
|
{
|
|
CondResult res;
|
|
|
|
DEBUG1(COND, "CondParser_Eval: %s\n", par->p);
|
|
|
|
res = CondParser_Or(par, true);
|
|
if (res == CR_ERROR)
|
|
return COND_INVALID;
|
|
|
|
if (CondParser_Token(par, false) != TOK_EOF)
|
|
return COND_INVALID;
|
|
|
|
*out_value = res == CR_TRUE;
|
|
return COND_PARSE;
|
|
}
|
|
|
|
/*
|
|
* Evaluate the condition, including any side effects from the variable
|
|
* expressions in the condition. The condition consists of &&, ||, !,
|
|
* function(arg), comparisons and parenthetical groupings thereof.
|
|
*
|
|
* Results:
|
|
* COND_PARSE if the condition was valid grammatically
|
|
* COND_INVALID if not a valid conditional.
|
|
*
|
|
* (*value) is set to the boolean value of the condition
|
|
*/
|
|
static CondEvalResult
|
|
CondEvalExpression(const char *cond, bool *out_value, bool plain,
|
|
bool (*evalBare)(size_t, const char *), bool negate,
|
|
bool eprint, bool strictLHS)
|
|
{
|
|
CondParser par;
|
|
CondEvalResult rval;
|
|
|
|
lhsStrict = strictLHS;
|
|
|
|
cpp_skip_hspace(&cond);
|
|
|
|
par.plain = plain;
|
|
par.evalBare = evalBare;
|
|
par.negateEvalBare = negate;
|
|
par.p = cond;
|
|
par.curr = TOK_NONE;
|
|
par.printedError = false;
|
|
|
|
rval = CondParser_Eval(&par, out_value);
|
|
|
|
if (rval == COND_INVALID && eprint && !par.printedError)
|
|
Parse_Error(PARSE_FATAL, "Malformed conditional (%s)", cond);
|
|
|
|
return rval;
|
|
}
|
|
|
|
/*
|
|
* Evaluate a condition in a :? modifier, such as
|
|
* ${"${VAR}" == value:?yes:no}.
|
|
*/
|
|
CondEvalResult
|
|
Cond_EvalCondition(const char *cond, bool *out_value)
|
|
{
|
|
return CondEvalExpression(cond, out_value, true,
|
|
FuncDefined, false, false, false);
|
|
}
|
|
|
|
static bool
|
|
IsEndif(const char *p)
|
|
{
|
|
return p[0] == 'e' && p[1] == 'n' && p[2] == 'd' &&
|
|
p[3] == 'i' && p[4] == 'f' && !ch_isalpha(p[5]);
|
|
}
|
|
|
|
static bool
|
|
DetermineKindOfConditional(const char **pp, bool *out_plain,
|
|
bool (**out_evalBare)(size_t, const char *),
|
|
bool *out_negate)
|
|
{
|
|
const char *p = *pp;
|
|
|
|
p += 2;
|
|
*out_plain = false;
|
|
*out_evalBare = FuncDefined;
|
|
*out_negate = false;
|
|
if (*p == 'n') {
|
|
p++;
|
|
*out_negate = true;
|
|
}
|
|
if (is_token(p, "def", 3)) { /* .ifdef and .ifndef */
|
|
p += 3;
|
|
} else if (is_token(p, "make", 4)) { /* .ifmake and .ifnmake */
|
|
p += 4;
|
|
*out_evalBare = FuncMake;
|
|
} else if (is_token(p, "", 0) && !*out_negate) { /* plain .if */
|
|
*out_plain = true;
|
|
} else {
|
|
/*
|
|
* TODO: Add error message about unknown directive,
|
|
* since there is no other known directive that starts
|
|
* with 'el' or 'if'.
|
|
*
|
|
* Example: .elifx 123
|
|
*/
|
|
return false;
|
|
}
|
|
|
|
*pp = p;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Evaluate the conditional directive in the line, which is one of:
|
|
*
|
|
* .if <cond>
|
|
* .ifmake <cond>
|
|
* .ifnmake <cond>
|
|
* .ifdef <cond>
|
|
* .ifndef <cond>
|
|
* .elif <cond>
|
|
* .elifmake <cond>
|
|
* .elifnmake <cond>
|
|
* .elifdef <cond>
|
|
* .elifndef <cond>
|
|
* .else
|
|
* .endif
|
|
*
|
|
* In these directives, <cond> consists of &&, ||, !, function(arg),
|
|
* comparisons, expressions, bare words, numbers and strings, and
|
|
* parenthetical groupings thereof.
|
|
*
|
|
* Results:
|
|
* COND_PARSE to continue parsing the lines that follow the
|
|
* conditional (when <cond> evaluates to true)
|
|
* COND_SKIP to skip the lines after the conditional
|
|
* (when <cond> evaluates to false, or when a previous
|
|
* branch has already been taken)
|
|
* COND_INVALID if the conditional was not valid, either because of
|
|
* a syntax error or because some variable was undefined
|
|
* or because the condition could not be evaluated
|
|
*/
|
|
CondEvalResult
|
|
Cond_EvalLine(const char *line)
|
|
{
|
|
typedef enum IfState {
|
|
|
|
/* None of the previous <cond> evaluated to true. */
|
|
IFS_INITIAL = 0,
|
|
|
|
/* The previous <cond> evaluated to true.
|
|
* The lines following this condition are interpreted. */
|
|
IFS_ACTIVE = 1 << 0,
|
|
|
|
/* The previous directive was an '.else'. */
|
|
IFS_SEEN_ELSE = 1 << 1,
|
|
|
|
/* One of the previous <cond> evaluated to true. */
|
|
IFS_WAS_ACTIVE = 1 << 2
|
|
|
|
} IfState;
|
|
|
|
static enum IfState *cond_states = NULL;
|
|
static unsigned int cond_states_cap = 128;
|
|
|
|
bool plain;
|
|
bool (*evalBare)(size_t, const char *);
|
|
bool negate;
|
|
bool isElif;
|
|
bool value;
|
|
IfState state;
|
|
const char *p = line;
|
|
|
|
if (cond_states == NULL) {
|
|
cond_states = bmake_malloc(
|
|
cond_states_cap * sizeof *cond_states);
|
|
cond_states[0] = IFS_ACTIVE;
|
|
}
|
|
|
|
p++; /* skip the leading '.' */
|
|
cpp_skip_hspace(&p);
|
|
|
|
if (IsEndif(p)) { /* It is an '.endif'. */
|
|
if (p[5] != '\0') {
|
|
Parse_Error(PARSE_FATAL,
|
|
"The .endif directive does not take arguments.");
|
|
}
|
|
|
|
if (cond_depth == cond_min_depth) {
|
|
Parse_Error(PARSE_FATAL, "if-less endif");
|
|
return COND_PARSE;
|
|
}
|
|
|
|
/* Return state for previous conditional */
|
|
cond_depth--;
|
|
return cond_states[cond_depth] & IFS_ACTIVE
|
|
? COND_PARSE : COND_SKIP;
|
|
}
|
|
|
|
/* Parse the name of the directive, such as 'if', 'elif', 'endif'. */
|
|
if (p[0] == 'e') {
|
|
if (p[1] != 'l') {
|
|
/*
|
|
* Unknown directive. It might still be a
|
|
* transformation rule like '.elisp.scm',
|
|
* therefore no error message here.
|
|
*/
|
|
return COND_INVALID;
|
|
}
|
|
|
|
/* Quite likely this is 'else' or 'elif' */
|
|
p += 2;
|
|
if (is_token(p, "se", 2)) { /* It is an 'else'. */
|
|
|
|
if (p[2] != '\0')
|
|
Parse_Error(PARSE_FATAL,
|
|
"The .else directive "
|
|
"does not take arguments.");
|
|
|
|
if (cond_depth == cond_min_depth) {
|
|
Parse_Error(PARSE_FATAL, "if-less else");
|
|
return COND_PARSE;
|
|
}
|
|
|
|
state = cond_states[cond_depth];
|
|
if (state == IFS_INITIAL) {
|
|
state = IFS_ACTIVE | IFS_SEEN_ELSE;
|
|
} else {
|
|
if (state & IFS_SEEN_ELSE)
|
|
Parse_Error(PARSE_WARNING,
|
|
"extra else");
|
|
state = IFS_WAS_ACTIVE | IFS_SEEN_ELSE;
|
|
}
|
|
cond_states[cond_depth] = state;
|
|
|
|
return state & IFS_ACTIVE ? COND_PARSE : COND_SKIP;
|
|
}
|
|
/* Assume for now it is an elif */
|
|
isElif = true;
|
|
} else
|
|
isElif = false;
|
|
|
|
if (p[0] != 'i' || p[1] != 'f') {
|
|
/*
|
|
* Unknown directive. It might still be a transformation rule
|
|
* like '.elisp.scm', therefore no error message here.
|
|
*/
|
|
return COND_INVALID; /* Not an ifxxx or elifxxx line */
|
|
}
|
|
|
|
if (!DetermineKindOfConditional(&p, &plain, &evalBare, &negate))
|
|
return COND_INVALID;
|
|
|
|
if (isElif) {
|
|
if (cond_depth == cond_min_depth) {
|
|
Parse_Error(PARSE_FATAL, "if-less elif");
|
|
return COND_PARSE;
|
|
}
|
|
state = cond_states[cond_depth];
|
|
if (state & IFS_SEEN_ELSE) {
|
|
Parse_Error(PARSE_WARNING, "extra elif");
|
|
cond_states[cond_depth] =
|
|
IFS_WAS_ACTIVE | IFS_SEEN_ELSE;
|
|
return COND_SKIP;
|
|
}
|
|
if (state != IFS_INITIAL) {
|
|
cond_states[cond_depth] = IFS_WAS_ACTIVE;
|
|
return COND_SKIP;
|
|
}
|
|
} else {
|
|
/* Normal .if */
|
|
if (cond_depth + 1 >= cond_states_cap) {
|
|
/*
|
|
* This is rare, but not impossible.
|
|
* In meta mode, dirdeps.mk (only runs at level 0)
|
|
* can need more than the default.
|
|
*/
|
|
cond_states_cap += 32;
|
|
cond_states = bmake_realloc(cond_states,
|
|
cond_states_cap *
|
|
sizeof *cond_states);
|
|
}
|
|
state = cond_states[cond_depth];
|
|
cond_depth++;
|
|
if (!(state & IFS_ACTIVE)) {
|
|
/*
|
|
* If we aren't parsing the data,
|
|
* treat as always false.
|
|
*/
|
|
cond_states[cond_depth] = IFS_WAS_ACTIVE;
|
|
return COND_SKIP;
|
|
}
|
|
}
|
|
|
|
/* And evaluate the conditional expression */
|
|
if (CondEvalExpression(p, &value, plain, evalBare, negate,
|
|
true, true) == COND_INVALID) {
|
|
/* Syntax error in conditional, error message already output. */
|
|
/* Skip everything to matching .endif */
|
|
/* XXX: An extra '.else' is not detected in this case. */
|
|
cond_states[cond_depth] = IFS_WAS_ACTIVE;
|
|
return COND_SKIP;
|
|
}
|
|
|
|
if (!value) {
|
|
cond_states[cond_depth] = IFS_INITIAL;
|
|
return COND_SKIP;
|
|
}
|
|
cond_states[cond_depth] = IFS_ACTIVE;
|
|
return COND_PARSE;
|
|
}
|
|
|
|
void
|
|
Cond_restore_depth(unsigned int saved_depth)
|
|
{
|
|
unsigned int open_conds = cond_depth - cond_min_depth;
|
|
|
|
if (open_conds != 0 || saved_depth > cond_depth) {
|
|
Parse_Error(PARSE_FATAL, "%u open conditional%s",
|
|
open_conds, open_conds == 1 ? "" : "s");
|
|
cond_depth = cond_min_depth;
|
|
}
|
|
|
|
cond_min_depth = saved_depth;
|
|
}
|
|
|
|
unsigned int
|
|
Cond_save_depth(void)
|
|
{
|
|
unsigned int depth = cond_min_depth;
|
|
|
|
cond_min_depth = cond_depth;
|
|
return depth;
|
|
}
|