kconfig: support user-defined function and recursively expanded variable

Now, we got a basic ability to test compiler capability in Kconfig.

config CC_HAS_STACKPROTECTOR
        def_bool $(shell,($(CC) -Werror -fstack-protector -E -x c /dev/null -o /dev/null 2>/dev/null) && echo y || echo n)

This works, but it is ugly to repeat this long boilerplate.

We want to describe like this:

config CC_HAS_STACKPROTECTOR
        bool
        default $(cc-option,-fstack-protector)

It is straight-forward to add a new function, but I do not like to
hard-code specialized functions like that.  Hence, here is another
feature, user-defined function.  This works as a textual shorthand
with parameterization.

A user-defined function is defined by using the = operator, and can
be referenced in the same way as built-in functions.  A user-defined
function in Make is referenced like $(call my-func,arg1,arg2), but I
omitted the 'call' to make the syntax shorter.

The definition of a user-defined function contains $(1), $(2), etc.
in its body to reference the parameters.  It is grammatically valid
to pass more or fewer arguments when calling it.  We already exploit
this feature in our makefiles; scripts/Kbuild.include defines cc-option
which takes two arguments at most, but most of the callers pass only
one argument.

By the way, a variable is supported as a subset of this feature since
a variable is "a user-defined function with zero argument".  In this
context, I mean "variable" as recursively expanded variable.  I will
add a different flavored variable in the next commit.

The code above can be written as follows:

[Example Code]

  success = $(shell,($(1)) >/dev/null 2>&1 && echo y || echo n)
  cc-option = $(success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null)

  config CC_HAS_STACKPROTECTOR
          def_bool $(cc-option,-fstack-protector)

[Result]
  $ make -s alldefconfig && tail -n 1 .config
  CONFIG_CC_HAS_STACKPROTECTOR=y
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

scripts/kconfig/lkc_proto.h

@@ -50,6 +50,8 @@ const char * prop_get_type_name(enum prop_type type);
 
 /* preprocess.c */
 void env_write_dep(FILE *f, const char *auto_conf_name);
+void variable_add(const char *name, const char *value);
+void variable_all_del(void);
 char *expand_string(const char *in);
 char *expand_dollar(const char **str);
 char *expand_one_token(const char **str);

scripts/kconfig/preprocess.c

@@ -177,6 +177,72 @@ static char *function_expand(const char *name, int argc, char *argv[])
 	return NULL;
 }
 
+/*
+ * Variables (and user-defined functions)
+ */
+static LIST_HEAD(variable_list);
+
+struct variable {
+	char *name;
+	char *value;
+	struct list_head node;
+};
+
+static struct variable *variable_lookup(const char *name)
+{
+	struct variable *v;
+
+	list_for_each_entry(v, &variable_list, node) {
+		if (!strcmp(name, v->name))
+			return v;
+	}
+
+	return NULL;
+}
+
+static char *variable_expand(const char *name, int argc, char *argv[])
+{
+	struct variable *v;
+
+	v = variable_lookup(name);
+	if (!v)
+		return NULL;
+
+	return expand_string_with_args(v->value, argc, argv);
+}
+
+void variable_add(const char *name, const char *value)
+{
+	struct variable *v;
+
+	v = variable_lookup(name);
+	if (v) {
+		free(v->value);
+	} else {
+		v = xmalloc(sizeof(*v));
+		v->name = xstrdup(name);
+		list_add_tail(&v->node, &variable_list);
+	}
+
+	v->value = xstrdup(value);
+}
+
+static void variable_del(struct variable *v)
+{
+	list_del(&v->node);
+	free(v->name);
+	free(v->value);
+	free(v);
+}
+
+void variable_all_del(void)
+{
+	struct variable *v, *tmp;
+
+	list_for_each_entry_safe(v, tmp, &variable_list, node)
+		variable_del(v);
+}
+
 /*
  * Evaluate a clause with arguments.  argc/argv are arguments from the upper
  * function call.
@@ -185,14 +251,26 @@ static char *function_expand(const char *name, int argc, char *argv[])
  */
 static char *eval_clause(const char *str, size_t len, int argc, char *argv[])
 {
-	char *tmp, *name, *res, *prev, *p;
+	char *tmp, *name, *res, *endptr, *prev, *p;
 	int new_argc = 0;
 	char *new_argv[FUNCTION_MAX_ARGS];
 	int nest = 0;
 	int i;
+	unsigned long n;
 
 	tmp = xstrndup(str, len);
 
+	/*
+	 * If variable name is '1', '2', etc.  It is generally an argument
+	 * from a user-function call (i.e. local-scope variable).  If not
+	 * available, then look-up global-scope variables.
+	 */
+	n = strtoul(tmp, &endptr, 10);
+	if (!*endptr && n > 0 && n <= argc) {
+		res = xstrdup(argv[n - 1]);
+		goto free_tmp;
+	}
+
 	prev = p = tmp;
 
 	/*
@@ -238,6 +316,11 @@ static char *eval_clause(const char *str, size_t len, int argc, char *argv[])
 		new_argv[i] = expand_string_with_args(new_argv[i + 1],
 						      argc, argv);
 
+	/* Search for variables */
+	res = variable_expand(name, new_argc, new_argv);
+	if (res)
+		goto free;
+
 	/* Look for built-in functions */
 	res = function_expand(name, new_argc, new_argv);
 	if (res)
@@ -255,6 +338,7 @@ static char *eval_clause(const char *str, size_t len, int argc, char *argv[])
 	for (i = 0; i < new_argc; i++)
 		free(new_argv[i]);
 	free(name);
+free_tmp:
 	free(tmp);
 
 	return res;

scripts/kconfig/zconf.l

 %option nostdinit noyywrap never-interactive full ecs
 %option 8bit nodefault yylineno
-%x COMMAND HELP STRING PARAM
+%x COMMAND HELP STRING PARAM ASSIGN_VAL
 %{
 /*
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
  * Released under the terms of the GNU GPL v2.0.
  */
 
+#include <assert.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -111,8 +112,10 @@ n	[A-Za-z0-9_-]
 		}
 		alloc_string(yytext, yyleng);
 		yylval.string = text;
-		return T_WORD;
+		return T_VARIABLE;
 	}
+	"="	{ BEGIN(ASSIGN_VAL); return T_ASSIGN; }
+	[[:blank:]]+
 	.	warn_ignored_character(*yytext);
 	\n	{
 		BEGIN(INITIAL);
@@ -120,6 +123,16 @@ n	[A-Za-z0-9_-]
 	}
 }
 
+<ASSIGN_VAL>{
+	[^[:blank:]\n]+.*	{
+		alloc_string(yytext, yyleng);
+		yylval.string = text;
+		return T_ASSIGN_VAL;
+	}
+	\n	{ BEGIN(INITIAL); return T_EOL; }
+	.
+}
+
 <PARAM>{
 	"&&"	return T_AND;
 	"||"	return T_OR;

scripts/kconfig/zconf.y

@@ -77,6 +77,9 @@ static struct menu *current_menu, *current_entry;
 %token T_CLOSE_PAREN
 %token T_OPEN_PAREN
 %token T_EOL
+%token <string> T_VARIABLE
+%token T_ASSIGN
+%token <string> T_ASSIGN_VAL
 
 %left T_OR
 %left T_AND
@@ -92,7 +95,7 @@ static struct menu *current_menu, *current_entry;
 %type <id> end
 %type <id> option_name
 %type <menu> if_entry menu_entry choice_entry
-%type <string> symbol_option_arg word_opt
+%type <string> symbol_option_arg word_opt assign_val
 
 %destructor {
 	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
@@ -143,6 +146,7 @@ common_stmt:
 	| config_stmt
 	| menuconfig_stmt
 	| source_stmt
+	| assignment_stmt
 ;
 
 option_error:
@@ -511,6 +515,15 @@ symbol:	  nonconst_symbol
 word_opt: /* empty */			{ $$ = NULL; }
 	| T_WORD
 
+/* assignment statement */
+
+assignment_stmt:  T_VARIABLE T_ASSIGN assign_val T_EOL	{ variable_add($1, $3); free($1); free($3); }
+
+assign_val:
+	/* empty */		{ $$ = xstrdup(""); };
+	| T_ASSIGN_VAL
+;
+
 %%
 
 void conf_parse(const char *name)
@@ -525,6 +538,10 @@ void conf_parse(const char *name)
 	if (getenv("ZCONF_DEBUG"))
 		yydebug = 1;
 	yyparse();
+
+	/* Variables are expanded in the parse phase. We can free them here. */
+	variable_all_del();
+
 	if (yynerrs)
 		exit(1);
 	if (!modules_sym)