lodewillems created this revision.
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Clang currently only recognizes a single escaped line between the end characters
of a block comment.
Fixes bug 15706
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D103008
Files:
clang/lib/Lex/Lexer.cpp
Index: clang/lib/Lex/Lexer.cpp
===================================================================
--- clang/lib/Lex/Lexer.cpp
+++ clang/lib/Lex/Lexer.cpp
@@ -2446,44 +2446,69 @@
// Back up off the newline.
--CurPtr;
- // If this is a two-character newline sequence, skip the other character.
- if (CurPtr[0] == '\n' || CurPtr[0] == '\r') {
- // \n\n or \r\r -> not escaped newline.
- if (CurPtr[0] == CurPtr[1])
- return false;
- // \n\r or \r\n -> skip the newline.
- --CurPtr;
- }
-
- // If we have horizontal whitespace, skip over it. We allow whitespace
- // between the slash and newline.
bool HasSpace = false;
- while (isHorizontalWhitespace(*CurPtr) || *CurPtr == 0) {
- --CurPtr;
- HasSpace = true;
- }
+ while (true) {
+ // If this is a two-character newline sequence, skip the other character.
+ if (CurPtr[0] == '\n' || CurPtr[0] == '\r') {
+ // \n\n or \r\r -> not escaped newline.
+ if (CurPtr[0] == CurPtr[1])
+ return false;
+ // \n\r or \r\n -> skip the newline.
+ --CurPtr;
+ }
+
+ // If we have horizontal whitespace, skip over it. We allow whitespace
+ // between the slash and newline.
+ while (isHorizontalWhitespace(*CurPtr) || *CurPtr == 0) {
+ --CurPtr;
+ HasSpace = true;
+ }
+
+ // If we have a slash, we know this is an escaped newline.
+ if (*CurPtr == '\\') {
+ // Found the *, we're done
+ if (CurPtr[-1] == '*') break;
+
+ // Found another possible escaped newline
+ if (CurPtr[-1] == '\n' || CurPtr[-1] == '\r') {
+ --CurPtr;
+ continue;
+ }
- // If we have a slash, we know this is an escaped newline.
- if (*CurPtr == '\\') {
- if (CurPtr[-1] != '*') return false;
- } else {
- // It isn't a slash, is it the ?? / trigraph?
- if (CurPtr[0] != '/' || CurPtr[-1] != '?' || CurPtr[-2] != '?' ||
- CurPtr[-3] != '*')
return false;
+ } else {
+ // It isn't a slash, is it the ?? / trigraph?
+ if (CurPtr[0] != '/' || CurPtr[-1] != '?' || CurPtr[-2] != '?')
+ return false;
+
+ // This is the trigraph ending the comment. Emit a stern warning!
+ CurPtr -= 2;
+
+ if (CurPtr[-1] == '*') {
+ // If no trigraphs are enabled, warn that we ignored this trigraph and
+ // ignore this * character.
+ if (!L->getLangOpts().Trigraphs) {
+ if (!L->isLexingRawMode())
+ L->Diag(CurPtr, diag::trigraph_ignored_block_comment);
+ return false;
+ }
+ if (!L->isLexingRawMode())
+ L->Diag(CurPtr, diag::trigraph_ends_block_comment);
- // This is the trigraph ending the comment. Emit a stern warning!
- CurPtr -= 2;
+ break;
+ } else if (CurPtr[-1] == '\n' || CurPtr[-1] == '\r') {
+ // If no trigraphs are enabled, warn that we ignored this trigraph
+ if (!L->getLangOpts().Trigraphs) {
+ if (!L->isLexingRawMode())
+ L->Diag(CurPtr, diag::trigraph_ignored);
+ return false;
+ }
+ --CurPtr;
+ continue;
+ }
- // If no trigraphs are enabled, warn that we ignored this trigraph and
- // ignore this * character.
- if (!L->getLangOpts().Trigraphs) {
- if (!L->isLexingRawMode())
- L->Diag(CurPtr, diag::trigraph_ignored_block_comment);
return false;
}
- if (!L->isLexingRawMode())
- L->Diag(CurPtr, diag::trigraph_ends_block_comment);
}
// Warn about having an escaped newline between the */ characters.
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