u-boot/scripts/kconfig/preprocess.c
Tom Rini 5972ff077e kconfig / kbuild: re-sync with Linux 4.18
Align Kconfig and Kbuild logic to Linux 4.18 release with minimal impact
on files outside of this scope.

Our previous Kconfig sync was done by commit e91610da7c ("kconfig:
re-sync with Linux 4.17-rc4").

A very small number of changes upstream since our sync with v4.17-rc4
that exist in the v4.18 release have already been applied here and have
been omitted from the list in this commit (and are readily available in
our own git history).

The imported Linux commits are:
[From prior to v4.17-rc4]
39a33ff80a25 kbuild: remove cc-option-align
db547ef19064 Kbuild: don't add obj tree in additional includes
b999596b963a Kbuild: don't add ../../ to include path

[From v4.17 to v4.18]
b3aa58d2e85d fixdep: suppress consecutive / from file paths in dependency list files
74656b682902 kbuild: disable new dtc graph and unit-address warnings
74d931716151 genksyms: remove symbol prefix support
e6ecfb45072c kbuild: do not display CHK for filechk
0b669a5076fd kconfig: refactor Qt package checks for building qconf
b464ef583dc7 kconfig: refactor GTK+ package checks for building gconf
1c5af5cf9308 kconfig: refactor ncurses package checks for building mconf and nconf
694c49a7c01c kconfig: drop localization support
96f60dfa5819 trace: Use -mcount-record for dynamic ftrace
bb222ceeb327 kconfig: remove string expansion in file_lookup()
96d8e48da55a kconfig: remove string expansion for mainmenu after yyparse()
5b31a9746756 kconfig: remove sym_expand_string_value()
137c0118a900 kconfig: make default prompt of mainmenu less specific
e298f3b49def kconfig: add built-in function support
2fd5b09c201e kconfig: add 'shell' built-in function
9de071536c87 kconfig: begin PARAM state only when seeing a command keyword
9ced3bddec08 kconfig: support user-defined function and recursively expanded variable
1175c02506ff kconfig: support simply expanded variable
ed2a22f277c6 kconfig: support append assignment operator
82bc8bd82e5c kconfig: expand lefthand side of assignment statement
1d6272e6fe43 kconfig: add 'info', 'warning-if', and 'error-if' built-in functions
a702a6176e2f kconfig: add 'filename' and 'lineno' built-in variables
915f64901eb3 kconfig: error out if a recursive variable references itself
2bece88f89fa kconfig: test: add Kconfig macro language tests
21c54b774744 kconfig: show compiler version text in the top comment
59f7b5847b0c kbuild: $(CHECK) doesnt need NOSTDINC_FLAGS twice
145167650b96 kbuild: add endianness flag to CHEKCFLAGS
1f2f01b122d7 kbuild: add machine size to CHECKFLAGS
d6a0c8a1326b kconfig: Add testconfig into make help output
bb6d83dde191 kbuild: Move last word of nconfig help to the previous line
8593080c0fcf kconfig: fix localmodconfig
ed7d40bc67b8 tracing: Fix SKIP_STACK_VALIDATION=1 build due to bad merge with -mrecord-mcount
b2d00d7c61c8 kconfig: fix line numbers for if-entries in menu tree
ecd53ac2f2c6 kconfig: handle P_SYMBOL in print_symbol()
73d1c580f92b kconfig: loop boundary condition fix
48f6e3cf5bc6 kbuild: do not drop -I without parameter
bd412d81b7ea kbuild: .PHONY is not a variable, but PHONY is
6916162c7308 kbuild: remove duplicated comments about PHONY

Cc: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Masahiro Yamada <masahiroy@kernel.org>
2020-03-16 18:54:18 -04:00

572 lines
11 KiB
C

// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2018 Masahiro Yamada <yamada.masahiro@socionext.com>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "list.h"
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
static char *expand_string_with_args(const char *in, int argc, char *argv[]);
static void __attribute__((noreturn)) pperror(const char *format, ...)
{
va_list ap;
fprintf(stderr, "%s:%d: ", current_file->name, yylineno);
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
fprintf(stderr, "\n");
exit(1);
}
/*
* Environment variables
*/
static LIST_HEAD(env_list);
struct env {
char *name;
char *value;
struct list_head node;
};
static void env_add(const char *name, const char *value)
{
struct env *e;
e = xmalloc(sizeof(*e));
e->name = xstrdup(name);
e->value = xstrdup(value);
list_add_tail(&e->node, &env_list);
}
static void env_del(struct env *e)
{
list_del(&e->node);
free(e->name);
free(e->value);
free(e);
}
/* The returned pointer must be freed when done */
static char *env_expand(const char *name)
{
struct env *e;
const char *value;
if (!*name)
return NULL;
list_for_each_entry(e, &env_list, node) {
if (!strcmp(name, e->name))
return xstrdup(e->value);
}
value = getenv(name);
if (!value)
return NULL;
/*
* We need to remember all referenced environment variables.
* They will be written out to include/config/auto.conf.cmd
*/
env_add(name, value);
return xstrdup(value);
}
void env_write_dep(FILE *f, const char *autoconfig_name)
{
struct env *e, *tmp;
list_for_each_entry_safe(e, tmp, &env_list, node) {
fprintf(f, "ifneq \"$(%s)\" \"%s\"\n", e->name, e->value);
fprintf(f, "%s: FORCE\n", autoconfig_name);
fprintf(f, "endif\n");
env_del(e);
}
}
/*
* Built-in functions
*/
struct function {
const char *name;
unsigned int min_args;
unsigned int max_args;
char *(*func)(int argc, char *argv[]);
};
static char *do_error_if(int argc, char *argv[])
{
if (!strcmp(argv[0], "y"))
pperror("%s", argv[1]);
return NULL;
}
static char *do_filename(int argc, char *argv[])
{
return xstrdup(current_file->name);
}
static char *do_info(int argc, char *argv[])
{
printf("%s\n", argv[0]);
return xstrdup("");
}
static char *do_lineno(int argc, char *argv[])
{
char buf[16];
sprintf(buf, "%d", yylineno);
return xstrdup(buf);
}
static char *do_shell(int argc, char *argv[])
{
FILE *p;
char buf[256];
char *cmd;
size_t nread;
int i;
cmd = argv[0];
p = popen(cmd, "r");
if (!p) {
perror(cmd);
exit(1);
}
nread = fread(buf, 1, sizeof(buf), p);
if (nread == sizeof(buf))
nread--;
/* remove trailing new lines */
while (nread > 0 && buf[nread - 1] == '\n')
nread--;
buf[nread] = 0;
/* replace a new line with a space */
for (i = 0; i < nread; i++) {
if (buf[i] == '\n')
buf[i] = ' ';
}
if (pclose(p) == -1) {
perror(cmd);
exit(1);
}
return xstrdup(buf);
}
static char *do_warning_if(int argc, char *argv[])
{
if (!strcmp(argv[0], "y"))
fprintf(stderr, "%s:%d: %s\n",
current_file->name, yylineno, argv[1]);
return xstrdup("");
}
static const struct function function_table[] = {
/* Name MIN MAX Function */
{ "error-if", 2, 2, do_error_if },
{ "filename", 0, 0, do_filename },
{ "info", 1, 1, do_info },
{ "lineno", 0, 0, do_lineno },
{ "shell", 1, 1, do_shell },
{ "warning-if", 2, 2, do_warning_if },
};
#define FUNCTION_MAX_ARGS 16
static char *function_expand(const char *name, int argc, char *argv[])
{
const struct function *f;
int i;
for (i = 0; i < ARRAY_SIZE(function_table); i++) {
f = &function_table[i];
if (strcmp(f->name, name))
continue;
if (argc < f->min_args)
pperror("too few function arguments passed to '%s'",
name);
if (argc > f->max_args)
pperror("too many function arguments passed to '%s'",
name);
return f->func(argc, argv);
}
return NULL;
}
/*
* Variables (and user-defined functions)
*/
static LIST_HEAD(variable_list);
struct variable {
char *name;
char *value;
enum variable_flavor flavor;
int exp_count;
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;
char *res;
v = variable_lookup(name);
if (!v)
return NULL;
if (argc == 0 && v->exp_count)
pperror("Recursive variable '%s' references itself (eventually)",
name);
if (v->exp_count > 1000)
pperror("Too deep recursive expansion");
v->exp_count++;
if (v->flavor == VAR_RECURSIVE)
res = expand_string_with_args(v->value, argc, argv);
else
res = xstrdup(v->value);
v->exp_count--;
return res;
}
void variable_add(const char *name, const char *value,
enum variable_flavor flavor)
{
struct variable *v;
char *new_value;
bool append = false;
v = variable_lookup(name);
if (v) {
/* For defined variables, += inherits the existing flavor */
if (flavor == VAR_APPEND) {
flavor = v->flavor;
append = true;
} else {
free(v->value);
}
} else {
/* For undefined variables, += assumes the recursive flavor */
if (flavor == VAR_APPEND)
flavor = VAR_RECURSIVE;
v = xmalloc(sizeof(*v));
v->name = xstrdup(name);
v->exp_count = 0;
list_add_tail(&v->node, &variable_list);
}
v->flavor = flavor;
if (flavor == VAR_SIMPLE)
new_value = expand_string(value);
else
new_value = xstrdup(value);
if (append) {
v->value = xrealloc(v->value,
strlen(v->value) + strlen(new_value) + 2);
strcat(v->value, " ");
strcat(v->value, new_value);
free(new_value);
} else {
v->value = new_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.
*
* Returned string must be freed when done
*/
static char *eval_clause(const char *str, size_t len, int argc, char *argv[])
{
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;
/*
* Split into tokens
* The function name and arguments are separated by a comma.
* For example, if the function call is like this:
* $(foo,$(x),$(y))
*
* The input string for this helper should be:
* foo,$(x),$(y)
*
* and split into:
* new_argv[0] = 'foo'
* new_argv[1] = '$(x)'
* new_argv[2] = '$(y)'
*/
while (*p) {
if (nest == 0 && *p == ',') {
*p = 0;
if (new_argc >= FUNCTION_MAX_ARGS)
pperror("too many function arguments");
new_argv[new_argc++] = prev;
prev = p + 1;
} else if (*p == '(') {
nest++;
} else if (*p == ')') {
nest--;
}
p++;
}
new_argv[new_argc++] = prev;
/*
* Shift arguments
* new_argv[0] represents a function name or a variable name. Put it
* into 'name', then shift the rest of the arguments. This simplifies
* 'const' handling.
*/
name = expand_string_with_args(new_argv[0], argc, argv);
new_argc--;
for (i = 0; i < new_argc; i++)
new_argv[i] = expand_string_with_args(new_argv[i + 1],
argc, argv);
/* Search for variables */
res = variable_expand(name, new_argc, new_argv);
if (res)
goto free;
/* Look for built-in functions */
res = function_expand(name, new_argc, new_argv);
if (res)
goto free;
/* Last, try environment variable */
if (new_argc == 0) {
res = env_expand(name);
if (res)
goto free;
}
res = xstrdup("");
free:
for (i = 0; i < new_argc; i++)
free(new_argv[i]);
free(name);
free_tmp:
free(tmp);
return res;
}
/*
* Expand a string that follows '$'
*
* For example, if the input string is
* ($(FOO)$($(BAR)))$(BAZ)
* this helper evaluates
* $($(FOO)$($(BAR)))
* and returns a new string containing the expansion (note that the string is
* recursively expanded), also advancing 'str' to point to the next character
* after the corresponding closing parenthesis, in this case, *str will be
* $(BAR)
*/
static char *expand_dollar_with_args(const char **str, int argc, char *argv[])
{
const char *p = *str;
const char *q;
int nest = 0;
/*
* In Kconfig, variable/function references always start with "$(".
* Neither single-letter variables as in $A nor curly braces as in ${CC}
* are supported. '$' not followed by '(' loses its special meaning.
*/
if (*p != '(') {
*str = p;
return xstrdup("$");
}
p++;
q = p;
while (*q) {
if (*q == '(') {
nest++;
} else if (*q == ')') {
if (nest-- == 0)
break;
}
q++;
}
if (!*q)
pperror("unterminated reference to '%s': missing ')'", p);
/* Advance 'str' to after the expanded initial portion of the string */
*str = q + 1;
return eval_clause(p, q - p, argc, argv);
}
char *expand_dollar(const char **str)
{
return expand_dollar_with_args(str, 0, NULL);
}
static char *__expand_string(const char **str, bool (*is_end)(char c),
int argc, char *argv[])
{
const char *in, *p;
char *expansion, *out;
size_t in_len, out_len;
out = xmalloc(1);
*out = 0;
out_len = 1;
p = in = *str;
while (1) {
if (*p == '$') {
in_len = p - in;
p++;
expansion = expand_dollar_with_args(&p, argc, argv);
out_len += in_len + strlen(expansion);
out = xrealloc(out, out_len);
strncat(out, in, in_len);
strcat(out, expansion);
free(expansion);
in = p;
continue;
}
if (is_end(*p))
break;
p++;
}
in_len = p - in;
out_len += in_len;
out = xrealloc(out, out_len);
strncat(out, in, in_len);
/* Advance 'str' to the end character */
*str = p;
return out;
}
static bool is_end_of_str(char c)
{
return !c;
}
/*
* Expand variables and functions in the given string. Undefined variables
* expand to an empty string.
* The returned string must be freed when done.
*/
static char *expand_string_with_args(const char *in, int argc, char *argv[])
{
return __expand_string(&in, is_end_of_str, argc, argv);
}
char *expand_string(const char *in)
{
return expand_string_with_args(in, 0, NULL);
}
static bool is_end_of_token(char c)
{
/* Why are '.' and '/' valid characters for symbols? */
return !(isalnum(c) || c == '_' || c == '-' || c == '.' || c == '/');
}
/*
* Expand variables in a token. The parsing stops when a token separater
* (in most cases, it is a whitespace) is encountered. 'str' is updated to
* point to the next character.
*
* The returned string must be freed when done.
*/
char *expand_one_token(const char **str)
{
return __expand_string(str, is_end_of_token, 0, NULL);
}