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Remove parser error recovery mode

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This commit is contained in:
Kamil Śliwak
2023-08-22 12:00:11 +02:00
parent c96db51013
commit 9adbced98e
44 changed files with 142 additions and 585 deletions
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liblangutil/ParserBase.cpp
+4 -50
View File
@@ -74,56 +74,10 @@ void ParserBase::expectToken(Token _value, bool _advance)
{
Token tok = m_scanner->currentToken();
if (tok != _value)
{
std::string const expectedToken = ParserBase::tokenName(_value);
if (m_parserErrorRecovery)
parserError(6635_error, "Expected " + expectedToken + " but got " + tokenName(tok));
else
fatalParserError(2314_error, "Expected " + expectedToken + " but got " + tokenName(tok));
// Do not advance so that recovery can sync or make use of the current token.
// This is especially useful if the expected token
// is the only one that is missing and is at the end of a construct.
// "{ ... ; }" is such an example.
// ^
_advance = false;
}
if (_advance)
advance();
}
void ParserBase::expectTokenOrConsumeUntil(Token _value, std::string const& _currentNodeName, bool _advance)
{
solAssert(m_inParserRecovery, "The function is supposed to be called during parser recovery only.");
Token tok = m_scanner->currentToken();
if (tok != _value)
{
SourceLocation errorLoc = currentLocation();
int startPosition = errorLoc.start;
while (m_scanner->currentToken() != _value && m_scanner->currentToken() != Token::EOS)
advance();
std::string const expectedToken = ParserBase::tokenName(_value);
if (m_scanner->currentToken() == Token::EOS)
{
// rollback to where the token started, and raise exception to be caught at a higher level.
m_scanner->setPosition(static_cast<size_t>(startPosition));
std::string const msg = "In " + _currentNodeName + ", " + expectedToken + "is expected; got " + ParserBase::tokenName(tok) + " instead.";
fatalParserError(1957_error, errorLoc, msg);
}
else
{
parserWarning(3796_error, "Recovered in " + _currentNodeName + " at " + expectedToken + ".");
m_inParserRecovery = false;
}
}
else
{
std::string expectedToken = ParserBase::tokenName(_value);
parserWarning(3347_error, "Recovered in " + _currentNodeName + " at " + expectedToken + ".");
m_inParserRecovery = false;
}
fatalParserError(
2314_error,
"Expected " + ParserBase::tokenName(_value) + " but got " + tokenName(tok)
);
if (_advance)
advance();
}
liblangutil/ParserBase.h
+4 -17
View File
@@ -38,14 +38,9 @@ struct ErrorId;
class ParserBase
{
public:
/// Set @a _parserErrorRecovery to true for additional error
/// recovery. This is experimental and intended for use
/// by front-end tools that need partial AST information even
/// when errors occur.
explicit ParserBase(ErrorReporter& errorReporter, bool _parserErrorRecovery = false): m_errorReporter(errorReporter)
{
m_parserErrorRecovery = _parserErrorRecovery;
}
explicit ParserBase(ErrorReporter& errorReporter):
m_errorReporter(errorReporter)
{}
virtual ~ParserBase() = default;
@@ -70,13 +65,9 @@ protected:
///@{
///@name Helper functions
/// If current token value is not @a _value, throw exception otherwise advance token
// @a if _advance is true and error recovery is in effect.
// if @a _advance is true
void expectToken(Token _value, bool _advance = true);
/// Like expectToken but if there is an error ignores tokens until
/// the expected token or EOS is seen. If EOS is encountered, back up to the error point,
/// and throw an exception so that a higher grammar rule has an opportunity to recover.
void expectTokenOrConsumeUntil(Token _value, std::string const& _currentNodeName, bool _advance = true);
Token currentToken() const;
Token peekNextToken() const;
std::string tokenName(Token _token);
@@ -108,10 +99,6 @@ protected:
ErrorReporter& m_errorReporter;
/// Current recursion depth during parsing.
size_t m_recursionDepth = 0;
/// True if we are in parser error recovery. Usually this means we are scanning for
/// a synchronization token like ';', or '}'. We use this to reduce cascaded error messages.
bool m_inParserRecovery = false;
bool m_parserErrorRecovery = false;
};
}