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[src/trunk]: src/usr.bin/make make(1): clean up Cond_EvalLine
details: https://anonhg.NetBSD.org/src/rev/a1d5e20348e2
branches: trunk
changeset: 945974:a1d5e20348e2
user: rillig <rillig%NetBSD.org@localhost>
date: Thu Nov 12 08:12:07 2020 +0000
description:
make(1): clean up Cond_EvalLine
The constant MAXIF was not a maximum but an initial capacity. Inline it
to remove the misleading name. Likewise, MAXIF_BUMP was an unnecessary
and wrong name.
Rename the enum since it only describes a single state, not multiple.
Rename the stack of states since it describes multiple states, not one.
Add markers where to add the missing error messages for unknown
directives or extraneous cond, such as in ".else cond" or ".endif cond".
diffstat:
usr.bin/make/cond.c | 104 +++++++++++++++++++++++++++++++--------------------
1 files changed, 63 insertions(+), 41 deletions(-)
diffs (237 lines):
diff -r 51c0d20ed5a2 -r a1d5e20348e2 usr.bin/make/cond.c
--- a/usr.bin/make/cond.c Thu Nov 12 07:44:01 2020 +0000
+++ b/usr.bin/make/cond.c Thu Nov 12 08:12:07 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: cond.c,v 1.205 2020/11/11 07:34:55 rillig Exp $ */
+/* $NetBSD: cond.c,v 1.206 2020/11/12 08:12:07 rillig Exp $ */
/*
* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
@@ -93,7 +93,7 @@
#include "dir.h"
/* "@(#)cond.c 8.2 (Berkeley) 1/2/94" */
-MAKE_RCSID("$NetBSD: cond.c,v 1.205 2020/11/11 07:34:55 rillig Exp $");
+MAKE_RCSID("$NetBSD: cond.c,v 1.206 2020/11/12 08:12:07 rillig Exp $");
/*
* The parsing of conditional expressions is based on this grammar:
@@ -1058,23 +1058,30 @@
return rval;
}
+/* Evaluate a condition in a :? modifier, such as
+ * ${"${VAR}" == value:?yes:no}. */
CondEvalResult
Cond_EvalCondition(const char *cond, Boolean *out_value)
{
return CondEvalExpression(NULL, cond, out_value, FALSE, FALSE);
}
-/* Evaluate the conditional in the passed line. The line looks like this:
- * .<cond-type> <expr>
- * In this line, <cond-type> is any of if, ifmake, ifnmake, ifdef, ifndef,
- * elif, elifmake, elifnmake, elifdef, elifndef.
- * In this line, <expr> consists of &&, ||, !, function(arg), comparisons
+/* Evaluate the conditional directive in the passed 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 this line, <cond> consists of &&, ||, !, function(arg), comparisons
* and parenthetical groupings thereof.
*
- * Note that the states IF_ACTIVE and ELSE_ACTIVE are only different in order
- * to detect spurious .else lines (as are SKIP_TO_ELSE and SKIP_TO_ENDIF),
- * otherwise .else could be treated as '.elif 1'.
- *
* Results:
* COND_PARSE to continue parsing the lines after the conditional
* (when .if or .else returns TRUE)
@@ -1088,26 +1095,29 @@
CondEvalResult
Cond_EvalLine(const char *line)
{
- enum { MAXIF = 128 }; /* maximum depth of .if'ing */
- enum { MAXIF_BUMP = 32 }; /* how much to grow by */
- enum if_states {
+ /*
+ * Note that the states IF_ACTIVE and ELSE_ACTIVE are only different in order
+ * to detect spurious .else lines (as are SKIP_TO_ELSE and SKIP_TO_ENDIF),
+ * otherwise .else could be treated as '.elif 1'.
+ */
+ typedef enum IfState {
IF_ACTIVE, /* .if or .elif part active */
ELSE_ACTIVE, /* .else part active */
SEARCH_FOR_ELIF, /* searching for .elif/else to execute */
SKIP_TO_ELSE, /* has been true, but not seen '.else' */
SKIP_TO_ENDIF /* nothing else to execute */
- };
- static enum if_states *cond_state = NULL;
- static unsigned int max_if_depth = MAXIF;
+ } IfState;
+ static enum IfState *cond_states = NULL;
+ static unsigned int cond_states_cap = 128;
const struct If *ifp;
Boolean isElif;
Boolean value;
- enum if_states state;
+ IfState state;
- if (cond_state == NULL) {
- cond_state = bmake_malloc(max_if_depth * sizeof *cond_state);
- cond_state[0] = IF_ACTIVE;
+ if (cond_states == NULL) {
+ cond_states = bmake_malloc(cond_states_cap * sizeof *cond_states);
+ cond_states[0] = IF_ACTIVE;
}
line++; /* skip the leading '.' */
cpp_skip_hspace(&line);
@@ -1115,8 +1125,10 @@
/* Find what type of if we're dealing with. */
if (line[0] == 'e') {
if (line[1] != 'l') {
- if (!is_token(line + 1, "ndif", 4))
+ if (!is_token(line + 1, "ndif", 4)) { /* It is an '.endif'. */
+ /* TODO: check for extraneous <cond> */
return COND_INVALID;
+ }
/* End of conditional section */
if (cond_depth == cond_min_depth) {
Parse_Error(PARSE_FATAL, "if-less endif");
@@ -1124,20 +1136,22 @@
}
/* Return state for previous conditional */
cond_depth--;
- return cond_state[cond_depth] <= ELSE_ACTIVE
+ return cond_states[cond_depth] <= ELSE_ACTIVE
? COND_PARSE : COND_SKIP;
}
/* Quite likely this is 'else' or 'elif' */
line += 2;
- if (is_token(line, "se", 2)) {
- /* It is else... */
+ if (is_token(line, "se", 2)) { /* It is an 'else'. */
+
+ /* TODO: check for extraneous <cond> */
+
if (cond_depth == cond_min_depth) {
Parse_Error(PARSE_FATAL, "if-less else");
return COND_PARSE;
}
- state = cond_state[cond_depth];
+ state = cond_states[cond_depth];
switch (state) {
case SEARCH_FOR_ELIF:
state = ELSE_ACTIVE;
@@ -1152,7 +1166,7 @@
state = SKIP_TO_ENDIF;
break;
}
- cond_state[cond_depth] = state;
+ cond_states[cond_depth] = state;
return state <= ELSE_ACTIVE ? COND_PARSE : COND_SKIP;
}
/* Assume for now it is an elif */
@@ -1160,8 +1174,11 @@
} else
isElif = FALSE;
- if (line[0] != 'i' || line[1] != 'f')
+ if (line[0] != 'i' || line[1] != 'f') {
+ /* TODO: Add error message about unknown directive.
+ * See directive-elif.mk:23 */
return COND_INVALID; /* Not an ifxxx or elifxxx line */
+ }
/*
* Figure out what sort of conditional it is -- what its default
@@ -1169,8 +1186,13 @@
*/
line += 2;
for (ifp = ifs;; ifp++) {
- if (ifp->form == NULL)
+ if (ifp->form == NULL) {
+ /* TODO: Add error message about unknown directive,
+ * since there is no other known directive that starts with 'el'
+ * or 'if'.
+ * Example: .elifx 123 */
return COND_INVALID;
+ }
if (is_token(line, ifp->form, ifp->formlen)) {
line += ifp->formlen;
break;
@@ -1184,34 +1206,34 @@
Parse_Error(PARSE_FATAL, "if-less elif");
return COND_PARSE;
}
- state = cond_state[cond_depth];
+ state = cond_states[cond_depth];
if (state == SKIP_TO_ENDIF || state == ELSE_ACTIVE) {
Parse_Error(PARSE_WARNING, "extra elif");
- cond_state[cond_depth] = SKIP_TO_ENDIF;
+ cond_states[cond_depth] = SKIP_TO_ENDIF;
return COND_SKIP;
}
if (state != SEARCH_FOR_ELIF) {
/* Either just finished the 'true' block, or already SKIP_TO_ELSE */
- cond_state[cond_depth] = SKIP_TO_ELSE;
+ cond_states[cond_depth] = SKIP_TO_ELSE;
return COND_SKIP;
}
} else {
/* Normal .if */
- if (cond_depth + 1 >= max_if_depth) {
+ 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.
*/
- max_if_depth += MAXIF_BUMP;
- cond_state = bmake_realloc(cond_state,
- max_if_depth * sizeof *cond_state);
+ cond_states_cap += 32;
+ cond_states = bmake_realloc(cond_states,
+ cond_states_cap * sizeof *cond_states);
}
- state = cond_state[cond_depth];
+ state = cond_states[cond_depth];
cond_depth++;
if (state > ELSE_ACTIVE) {
/* If we aren't parsing the data, treat as always false */
- cond_state[cond_depth] = SKIP_TO_ELSE;
+ cond_states[cond_depth] = SKIP_TO_ELSE;
return COND_SKIP;
}
}
@@ -1220,15 +1242,15 @@
if (CondEvalExpression(ifp, line, &value, TRUE, TRUE) == COND_INVALID) {
/* Syntax error in conditional, error message already output. */
/* Skip everything to matching .endif */
- cond_state[cond_depth] = SKIP_TO_ELSE;
+ cond_states[cond_depth] = SKIP_TO_ELSE;
return COND_SKIP;
}
if (!value) {
- cond_state[cond_depth] = SEARCH_FOR_ELIF;
+ cond_states[cond_depth] = SEARCH_FOR_ELIF;
return COND_SKIP;
}
- cond_state[cond_depth] = IF_ACTIVE;
+ cond_states[cond_depth] = IF_ACTIVE;
return COND_PARSE;
}
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