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//===--- Diagnostics.cpp - Helper class for error diagnostics -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/ASTMatchers/Dynamic/Diagnostics.h"
namespace clang {
namespace ast_matchers {
namespace dynamic {
Diagnostics::ArgStream Diagnostics::pushContextFrame(ContextType Type,
SourceRange Range) {
ContextStack.emplace_back();
ContextFrame& data = ContextStack.back();
data.Type = Type;
data.Range = Range;
return ArgStream(&data.Args);
}
Diagnostics::Context::Context(ConstructMatcherEnum, Diagnostics *Error,
StringRef MatcherName,
SourceRange MatcherRange)
: Error(Error) {
Error->pushContextFrame(CT_MatcherConstruct, MatcherRange) << MatcherName;
}
Diagnostics::Context::Context(MatcherArgEnum, Diagnostics *Error,
StringRef MatcherName,
SourceRange MatcherRange,
unsigned ArgNumber)
: Error(Error) {
Error->pushContextFrame(CT_MatcherArg, MatcherRange) << ArgNumber
<< MatcherName;
}
Diagnostics::Context::~Context() { Error->ContextStack.pop_back(); }
Diagnostics::OverloadContext::OverloadContext(Diagnostics *Error)
: Error(Error), BeginIndex(Error->Errors.size()) {}
Diagnostics::OverloadContext::~OverloadContext() {
// Merge all errors that happened while in this context.
if (BeginIndex < Error->Errors.size()) {
Diagnostics::ErrorContent &Dest = Error->Errors[BeginIndex];
for (size_t i = BeginIndex + 1, e = Error->Errors.size(); i < e; ++i) {
Dest.Messages.push_back(Error->Errors[i].Messages[0]);
}
Error->Errors.resize(BeginIndex + 1);
}
}
void Diagnostics::OverloadContext::revertErrors() {
// Revert the errors.
Error->Errors.resize(BeginIndex);
}
Diagnostics::ArgStream &Diagnostics::ArgStream::operator<<(const Twine &Arg) {
Out->push_back(Arg.str());
return *this;
}
Diagnostics::ArgStream Diagnostics::addError(SourceRange Range,
ErrorType Error) {
Errors.emplace_back();
ErrorContent &Last = Errors.back();
Last.ContextStack = ContextStack;
Last.Messages.emplace_back();
Last.Messages.back().Range = Range;
Last.Messages.back().Type = Error;
return ArgStream(&Last.Messages.back().Args);
}
static StringRef contextTypeToFormatString(Diagnostics::ContextType Type) {
switch (Type) {
case Diagnostics::CT_MatcherConstruct:
return "Error building matcher $0.";
case Diagnostics::CT_MatcherArg:
return "Error parsing argument $0 for matcher $1.";
}
llvm_unreachable("Unknown ContextType value.");
}
static StringRef errorTypeToFormatString(Diagnostics::ErrorType Type) {
switch (Type) {
case Diagnostics::ET_RegistryMatcherNotFound:
return "Matcher not found: $0";
case Diagnostics::ET_RegistryWrongArgCount:
return "Incorrect argument count. (Expected = $0) != (Actual = $1)";
case Diagnostics::ET_RegistryWrongArgType:
return "Incorrect type for arg $0. (Expected = $1) != (Actual = $2)";
case Diagnostics::ET_RegistryNotBindable:
return "Matcher does not support binding.";
case Diagnostics::ET_RegistryAmbiguousOverload:
// TODO: Add type info about the overload error.
return "Ambiguous matcher overload.";
case Diagnostics::ET_RegistryValueNotFound:
return "Value not found: $0";
case Diagnostics::ET_ParserStringError:
return "Error parsing string token: <$0>";
case Diagnostics::ET_ParserNoOpenParen:
return "Error parsing matcher. Found token <$0> while looking for '('.";
case Diagnostics::ET_ParserNoCloseParen:
return "Error parsing matcher. Found end-of-code while looking for ')'.";
case Diagnostics::ET_ParserNoComma:
return "Error parsing matcher. Found token <$0> while looking for ','.";
case Diagnostics::ET_ParserNoCode:
return "End of code found while looking for token.";
case Diagnostics::ET_ParserNotAMatcher:
return "Input value is not a matcher expression.";
case Diagnostics::ET_ParserInvalidToken:
return "Invalid token <$0> found when looking for a value.";
case Diagnostics::ET_ParserMalformedBindExpr:
return "Malformed bind() expression.";
case Diagnostics::ET_ParserTrailingCode:
return "Expected end of code.";
case Diagnostics::ET_ParserNumberError:
return "Error parsing numeric literal: <$0>";
case Diagnostics::ET_ParserOverloadedType:
return "Input value has unresolved overloaded type: $0";
case Diagnostics::ET_None:
return "<N/A>";
}
llvm_unreachable("Unknown ErrorType value.");
}
static void formatErrorString(StringRef FormatString,
ArrayRef<std::string> Args,
llvm::raw_ostream &OS) {
while (!FormatString.empty()) {
std::pair<StringRef, StringRef> Pieces = FormatString.split("$");
OS << Pieces.first.str();
if (Pieces.second.empty()) break;
const char Next = Pieces.second.front();
FormatString = Pieces.second.drop_front();
if (Next >= '0' && Next <= '9') {
const unsigned Index = Next - '0';
if (Index < Args.size()) {
OS << Args[Index];
} else {
OS << "<Argument_Not_Provided>";
}
}
}
}
static void maybeAddLineAndColumn(SourceRange Range,
llvm::raw_ostream &OS) {
if (Range.Start.Line > 0 && Range.Start.Column > 0) {
OS << Range.Start.Line << ":" << Range.Start.Column << ": ";
}
}
static void printContextFrameToStream(const Diagnostics::ContextFrame &Frame,
llvm::raw_ostream &OS) {
maybeAddLineAndColumn(Frame.Range, OS);
formatErrorString(contextTypeToFormatString(Frame.Type), Frame.Args, OS);
}
static void
printMessageToStream(const Diagnostics::ErrorContent::Message &Message,
const Twine Prefix, llvm::raw_ostream &OS) {
maybeAddLineAndColumn(Message.Range, OS);
OS << Prefix;
formatErrorString(errorTypeToFormatString(Message.Type), Message.Args, OS);
}
static void printErrorContentToStream(const Diagnostics::ErrorContent &Content,
llvm::raw_ostream &OS) {
if (Content.Messages.size() == 1) {
printMessageToStream(Content.Messages[0], "", OS);
} else {
for (size_t i = 0, e = Content.Messages.size(); i != e; ++i) {
if (i != 0) OS << "\n";
printMessageToStream(Content.Messages[i],
"Candidate " + Twine(i + 1) + ": ", OS);
}
}
}
void Diagnostics::printToStream(llvm::raw_ostream &OS) const {
for (size_t i = 0, e = Errors.size(); i != e; ++i) {
if (i != 0) OS << "\n";
printErrorContentToStream(Errors[i], OS);
}
}
std::string Diagnostics::toString() const {
std::string S;
llvm::raw_string_ostream OS(S);
printToStream(OS);
return OS.str();
}
void Diagnostics::printToStreamFull(llvm::raw_ostream &OS) const {
for (size_t i = 0, e = Errors.size(); i != e; ++i) {
if (i != 0) OS << "\n";
const ErrorContent &Error = Errors[i];
for (size_t i = 0, e = Error.ContextStack.size(); i != e; ++i) {
printContextFrameToStream(Error.ContextStack[i], OS);
OS << "\n";
}
printErrorContentToStream(Error, OS);
}
}
std::string Diagnostics::toStringFull() const {
std::string S;
llvm::raw_string_ostream OS(S);
printToStreamFull(OS);
return OS.str();
}
} // namespace dynamic
} // namespace ast_matchers
} // namespace clang
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