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106 lines
4.2 KiB
C
106 lines
4.2 KiB
C
/*****************************************************************************/
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/* */
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/* staticassert.h */
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/* */
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/* _Static_assert handling for the cc65 C compiler */
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/* */
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/* */
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/* */
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/* Copyright 2020 The cc65 Authors */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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/* cc65 */
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#include "error.h"
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#include "expr.h"
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#include "litpool.h"
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#include "scanner.h"
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#include "staticassert.h"
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/*****************************************************************************/
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/* _Static_assert handling functions */
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/*****************************************************************************/
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void ParseStaticAssert ()
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{
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/*
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** static_assert-declaration ::=
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** _Static_assert ( constant-expression ) ;
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** _Static_assert ( constant-expression , string-literal ) ;
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*/
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ExprDesc Expr;
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int failed;
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/* Skip the _Static_assert token itself */
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CHECK (CurTok.Tok == TOK_STATIC_ASSERT);
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NextToken ();
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/* We expect an opening paren */
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if (!ConsumeLParen ()) {
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return;
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}
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/* Parse assertion condition */
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Expr = NoCodeConstAbsIntExpr (hie1);
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failed = !Expr.IVal;
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/* If there is a comma, we also have an error message. The message is optional because we
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** support the C2X syntax with only an expression.
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*/
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if (CurTok.Tok == TOK_COMMA) {
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/* Skip the comma. */
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NextToken ();
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/* String literal */
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if (CurTok.Tok != TOK_SCONST) {
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Error ("String literal expected for static_assert message");
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return;
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}
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/* Issue an error including the message if the static_assert failed. */
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if (failed) {
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Error ("static_assert failed '%s'", GetLiteralStr (CurTok.SVal));
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}
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/* Consume the string constant, now that we don't need it anymore.
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** This should never fail since we checked the token type above.
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*/
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if (!Consume (TOK_SCONST, "String literal expected")) {
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return;
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}
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} else {
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/* No message. */
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if (failed) {
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Error ("static_assert failed");
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}
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}
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/* Closing paren and semi-colon needed */
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ConsumeRParen ();
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ConsumeSemi ();
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}
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