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The '#' operator in macro replacement is now checked at macro definition instead of macro expansion.

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acqn 2022-08-22 14:34:50 +08:00
parent 2f6b5621cc
commit 6260414136
1 changed files with 95 additions and 26 deletions
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121
src/cc65/preproc.c
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@ -1663,7 +1663,8 @@ static unsigned SubstMacroArgs (unsigned NameIdx, StrBuf* Target, MacroExp* E, M
NextChar ();
SkipWhitespace (0);
if (!IsSym (Ident) || (ParamIdx = FindMacroParam (M, Ident)) < 0) {
PPError ("'#' is not followed by a macro parameter");
/* Should not happen, but still */
Internal ("'#' is not followed by a macro parameter");
} else {
/* Make a valid string from Replacement */
MacroExp* A = ME_GetOriginalArg (E, ParamIdx);
@ -2052,6 +2053,96 @@ Loop:
static int ParseMacroReplacement (StrBuf* Source, Macro* M)
/* Check correctness of macro definition while squeezing old and new style
** comments and other non-newline whitespace sequences. Return 1 on success
** or 0 on failure.
*/
{
/* Switch to the new input source */
StrBuf* OldSource = InitLine (Source);
int HasWhiteSpace = 0;
unsigned Len;
ident Ident;
/* Skip whitespace before the macro replacement */
SkipWhitespace (0);
/* Check for ## at start */
if (CurC == '#' && NextC == '#') {
/* Diagnose and bail out */
PPError ("'##' cannot appear at start of macro expansion");
goto Error_Handler;
}
/* Loop removing ws and comments */
while (CurC != '\0') {
if (HasWhiteSpace) {
SB_AppendChar (&M->Replacement, ' ');
} else if (IsQuote (CurC)) {
CopyQuotedString (&M->Replacement);
} else {
if (M->ParamCount >= 0 && GetPunc (Ident)) {
Len = strlen (Ident);
/* Check for # */
if (Len == 1 && Ident[0] == '#') {
HasWhiteSpace = SkipWhitespace (0);
/* Check next pp-token */
if (!IsSym (Ident) || FindMacroParam (M, Ident) < 0) {
PPError ("'#' is not followed by a macro parameter");
goto Error_Handler;
}
/* Make the replacement */
SB_AppendChar (&M->Replacement, '#');
if (HasWhiteSpace) {
SB_AppendChar (&M->Replacement, ' ');
}
SB_AppendStr (&M->Replacement, Ident);
} else {
SB_AppendBuf (&M->Replacement, Ident, Len);
}
} else {
SB_AppendChar (&M->Replacement, CurC);
NextChar ();
}
}
HasWhiteSpace = SkipWhitespace (0);
}
/* Check for ## at end */
Len = SB_GetLen (&M->Replacement);
if (Len >= 2) {
if (SB_LookAt (&M->Replacement, Len - 1) == '#' &&
SB_LookAt (&M->Replacement, Len - 2) == '#') {
/* Diagnose and bail out */
PPError ("'##' cannot appear at end of macro expansion");
goto Error_Handler;
}
}
/* Terminate the new input line */
SB_Terminate (&M->Replacement);
/* Switch back to the old source */
InitLine (OldSource);
/* Success */
return 1;
Error_Handler:
/* Switch back to the old source */
InitLine (OldSource);
/* Failure */
return 0;
}
static void DoDefine (void)
/* Process #define directive */
{
@ -2059,7 +2150,6 @@ static void DoDefine (void)
Macro* M = 0;
Macro* Existing;
int C89;
unsigned Len;
/* Read the macro name */
SkipWhitespace (0);
@ -2150,38 +2240,17 @@ static void DoDefine (void)
NextChar ();
}
/* Skip whitespace before the macro replacement */
SkipWhitespace (0);
/* Remove whitespace and comments from the line, store the preprocessed
** line into the macro replacement buffer.
*/
TranslationPhase3 (Line, &M->Replacement);
/* Remove whitespace from the end of the line */
while (IsSpace (SB_LookAtLast (&M->Replacement))) {
SB_Drop (&M->Replacement, 1);
if (ParseMacroReplacement (Line, M) == 0) {
goto Error_Handler;
}
#if 0
printf ("%s: <%.*s>\n", M->Name, SB_GetLen (&M->Replacement), SB_GetConstBuf (&M->Replacement));
#endif
/* Check for ## at start or end */
Len = SB_GetLen (&M->Replacement);
if (Len >= 2) {
if (SB_LookAt (&M->Replacement, 0) == '#' &&
SB_LookAt (&M->Replacement, 1) == '#') {
/* Diagnose and bail out */
PPError ("'##' cannot appear at start of macro expansion");
goto Error_Handler;
} else if (SB_LookAt (&M->Replacement, Len - 1) == '#' &&
SB_LookAt (&M->Replacement, Len - 2) == '#') {
/* Diagnose and bail out */
PPError ("'##' cannot appear at end of macro expansion");
goto Error_Handler;
}
}
/* Get an existing macro definition with this name */
Existing = FindMacro (M->Name);