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Add support for static_assert

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Add C11's _Static_assert and static_assert macro.

This is like #error, but is handled at a later stage
of translation, so it is possible to check sizes of
types, values of enums, etc.

https://en.cppreference.com/w/c/language/_Static_assert
https://port70.net/~nsz/c/c11/n1570.html#6.7.10
This commit is contained in:
Jesse Rosenstock 2020-07-26 22:16:47 +02:00 committed by Oliver Schmidt
parent c72fa735b9
commit 3df6c383c0
10 changed files with 274 additions and 0 deletions
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6
include/assert.h
View File

@ -46,6 +46,12 @@ extern void __fastcall__ _afailed (const char*, unsigned);
# define assert(expr) ((expr)? (void)0 : _afailed(__FILE__, __LINE__))
#endif
/*
** TODO: Guard with #if __STDC_VERSION__ >= 201112L or similar when there
** is a C11 mode.
*/
#define static_assert _Static_assert
/* End of assert.h */

7
src/cc65/compile.c
View File

@ -61,6 +61,7 @@
#include "pragma.h"
#include "preproc.h"
#include "standard.h"
#include "staticassert.h"
#include "symtab.h"
@ -108,6 +109,12 @@ static void Parse (void)
continue;
}
/* Check for a _Static_assert */
if (CurTok.Tok == TOK_STATIC_ASSERT) {
ParseStaticAssert ();
continue;
}
/* Read variable defs and functions */
ParseDeclSpec (&Spec, SC_EXTERN | SC_STATIC, T_INT);

8
src/cc65/declare.c
View File

@ -58,6 +58,7 @@
#include "pragma.h"
#include "scanner.h"
#include "standard.h"
#include "staticassert.h"
#include "symtab.h"
#include "wrappedcall.h"
#include "typeconv.h"
@ -935,6 +936,13 @@ static SymEntry* ParseStructDecl (const char* Name)
/* Get the type of the entry */
DeclSpec Spec;
/* Check for a _Static_assert */
if (CurTok.Tok == TOK_STATIC_ASSERT) {
ParseStaticAssert ();
continue;
}
InitDeclSpec (&Spec);
ParseTypeSpec (&Spec, -1, T_QUAL_NONE);

8
src/cc65/locals.c
View File

@ -50,6 +50,7 @@
#include "locals.h"
#include "stackptr.h"
#include "standard.h"
#include "staticassert.h"
#include "symtab.h"
#include "typeconv.h"
#include "input.h"
@ -511,6 +512,13 @@ void DeclareLocals (void)
** declarations.
*/
DeclSpec Spec;
/* Check for a _Static_assert */
if (CurTok.Tok == TOK_STATIC_ASSERT) {
ParseStaticAssert ();
continue;
}
ParseDeclSpec (&Spec, SC_AUTO, T_INT);
if ((Spec.Flags & DS_DEF_STORAGE) != 0 && /* No storage spec */
(Spec.Flags & DS_DEF_TYPE) != 0 && /* No type given */

1
src/cc65/scanner.c
View File

@ -86,6 +86,7 @@ static const struct Keyword {
unsigned char Std; /* Token supported in which standards? */
} Keywords [] = {
{ "_Pragma", TOK_PRAGMA, TT_C89 | TT_C99 | TT_CC65 }, /* !! */
{ "_Static_assert", TOK_STATIC_ASSERT, TT_CC65 }, /* C11 */
{ "__AX__", TOK_AX, TT_C89 | TT_C99 | TT_CC65 },
{ "__A__", TOK_A, TT_C89 | TT_C99 | TT_CC65 },
{ "__EAX__", TOK_EAX, TT_C89 | TT_C99 | TT_CC65 },

1
src/cc65/scanner.h
View File

@ -173,6 +173,7 @@ typedef enum token_t {
TOK_WCSCONST,
TOK_ATTRIBUTE,
TOK_STATIC_ASSERT,
TOK_FAR,
TOK_NEAR,
TOK_A,

96
src/cc65/staticassert.c Normal file
View File

@ -0,0 +1,96 @@
/*****************************************************************************/
/* */
/* staticassert.h */
/* */
/* _Static_assert handling for the cc65 C compiler */
/* */
/* */
/* */
/* Copyright 2020 Google LLC */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
/* cc65 */
#include "error.h"
#include "expr.h"
#include "litpool.h"
#include "scanner.h"
#include "staticassert.h"
/*****************************************************************************/
/* _Static_assert handling functions */
/*****************************************************************************/
void ParseStaticAssert ()
{
/*
** static_assert-declaration ::=
** _Static_assert ( constant-expression , string-literal ) ;
*/
ExprDesc Expr;
int failed;
/* Skip the _Static_assert token itself */
CHECK (CurTok.Tok == TOK_STATIC_ASSERT);
NextToken ();
/* We expect an opening paren */
if (!ConsumeLParen ()) {
return;
}
/* Parse assertion condition */
ConstAbsIntExpr (hie1, &Expr);
failed = !Expr.IVal;
/* We expect a comma */
if (!ConsumeComma ()) {
return;
}
/* String literal */
if (CurTok.Tok != TOK_SCONST) {
Error ("String literal expected for static_assert message");
return;
}
/* Issue an error including the message if the static_assert failed. */
if (failed) {
Error ("static_assert failed '%s'", GetLiteralStr (CurTok.SVal));
}
/* Consume the string constant, now that we don't need it anymore.
** This should never fail since we checked the token type above.
*/
if (!Consume (TOK_SCONST, "String literal expected")) {
return;
}
/* Closing paren and semi-colon needed */
ConsumeRParen ();
ConsumeSemi ();
}

51
src/cc65/staticassert.h Normal file
View File

@ -0,0 +1,51 @@
/*****************************************************************************/
/* */
/* staticassert.h */
/* */
/* _Static_assert handling for the cc65 C compiler */
/* */
/* */
/* */
/* Copyright 2020 Google LLC */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#ifndef STATICASSERT_H
#define STATICASSERT_H
/*****************************************************************************/
/* Code */
/*****************************************************************************/
void ParseStaticAssert (void);
/* Handle _Static_assert. These are a C11 feature. */
/* End of staticassert.h */
#endif

26
test/err/staticassert.c Normal file
View File

@ -0,0 +1,26 @@
/*
Copyright 2020 Google LLC
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
/*
** Test of failing _Static_assert.
**/
_Static_assert(0, "0 should be false.");

70
test/val/staticassert.c Normal file
View File

@ -0,0 +1,70 @@
/*
Copyright 2020 Google LLC
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
/*
** Tests of passing _Static_asserts.
**/
#include <assert.h>
_Static_assert (1, "1 should be true.");
_Static_assert (!0, "!0 should be true.");
_Static_assert (1 == 1, "1 == 1 should be true.");
_Static_assert (1 == 1L, "1 == 1L should be true.");
_Static_assert (1 != 0, "1 != 0 should be true.");
_Static_assert (sizeof (char) == 1, "sizeof (char) should be 1.");
_Static_assert (sizeof (int) == 2, "sizeof (int) should be 2.");
/* Make sure we can also do structs. */
struct sc { char a; };
_Static_assert (sizeof (struct sc) == 1, "sizeof (struct sc) should be 1.");
struct si { int a; };
_Static_assert (sizeof (struct si) == 2, "sizeof (struct si) should be 2.");
/* Try enums. */
enum { k = 1 };
_Static_assert (k == 1, "k should be 1.");
/* Just test the macro version once. */
static_assert (1, "1 should be true.");
/* _Static_assert can appear anywhere a declaration can. */
void f (void)
{
_Static_assert (1, "1 should still be true.");
if (1) {
_Static_assert (1, "1 should still be true.");
}
}
/* _Static_assert can also appear in structs. */
struct S {
int a;
_Static_assert (1, "1 should still be true.");
int b;
};
int main (void)
{
return 0;
}