//===-- lib/Parser/message.cpp --------------------------------------------===//
//
// 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 "flang/Parser/message.h"
#include "flang/Common/idioms.h"
#include "flang/Parser/char-set.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstring>
#include <string>
#include <vector>
namespace Fortran::parser {
llvm::raw_ostream &operator<<(llvm::raw_ostream &o, const MessageFixedText &t) {
std::size_t n{t.text().size()};
for (std::size_t j{0}; j < n; ++j) {
o << t.text()[j];
}
return o;
}
void MessageFormattedText::Format(const MessageFixedText *text, ...) {
const char *p{text->text().begin()};
std::string asString;
if (*text->text().end() != '\0') {
// not NUL-terminated
asString = text->text().NULTerminatedToString();
p = asString.c_str();
}
va_list ap;
va_start(ap, text);
#ifdef _MSC_VER
// Microsoft has a separate function for "positional arguments", which is
// used in some messages.
int need{_vsprintf_p(nullptr, 0, p, ap)};
#else
int need{vsnprintf(nullptr, 0, p, ap)};
#endif
CHECK(need >= 0);
char *buffer{
static_cast<char *>(std::malloc(static_cast<std::size_t>(need) + 1))};
CHECK(buffer);
va_end(ap);
va_start(ap, text);
#ifdef _MSC_VER
// Use positional argument variant of printf.
int need2{_vsprintf_p(buffer, need + 1, p, ap)};
#else
int need2{vsnprintf(buffer, need + 1, p, ap)};
#endif
CHECK(need2 == need);
va_end(ap);
string_ = buffer;
std::free(buffer);
conversions_.clear();
}
const char *MessageFormattedText::Convert(const std::string &s) {
conversions_.emplace_front(s);
return conversions_.front().c_str();
}
const char *MessageFormattedText::Convert(std::string &&s) {
conversions_.emplace_front(std::move(s));
return conversions_.front().c_str();
}
const char *MessageFormattedText::Convert(const std::string_view &s) {
conversions_.emplace_front(s);
return conversions_.front().c_str();
}
const char *MessageFormattedText::Convert(std::string_view &&s) {
conversions_.emplace_front(s);
return conversions_.front().c_str();
}
const char *MessageFormattedText::Convert(CharBlock x) {
return Convert(x.ToString());
}
std::string MessageExpectedText::ToString() const {
return common::visit(
common::visitors{
[](CharBlock cb) {
return MessageFormattedText("expected '%s'"_err_en_US, cb)
.MoveString();
},
[](const SetOfChars &set) {
SetOfChars expect{set};
if (expect.Has('\n')) {
expect = expect.Difference('\n');
if (expect.empty()) {
return "expected end of line"_err_en_US.text().ToString();
} else {
std::string s{expect.ToString()};
if (s.size() == 1) {
return MessageFormattedText(
"expected end of line or '%s'"_err_en_US, s)
.MoveString();
} else {
return MessageFormattedText(
"expected end of line or one of '%s'"_err_en_US, s)
.MoveString();
}
}
}
std::string s{expect.ToString()};
if (s.size() != 1) {
return MessageFormattedText("expected one of '%s'"_err_en_US, s)
.MoveString();
} else {
return MessageFormattedText("expected '%s'"_err_en_US, s)
.MoveString();
}
},
},
u_);
}
bool MessageExpectedText::Merge(const MessageExpectedText &that) {
return common::visit(common::visitors{
[](SetOfChars &s1, const SetOfChars &s2) {
s1 = s1.Union(s2);
return true;
},
[](const auto &, const auto &) { return false; },
},
u_, that.u_);
}
bool Message::SortBefore(const Message &that) const {
// Messages from prescanning have ProvenanceRange values for their locations,
// while messages from later phases have CharBlock values, since the
// conversion of cooked source stream locations to provenances is not
// free and needs to be deferred, and many messages created during parsing
// are speculative. Messages with ProvenanceRange locations are ordered
// before others for sorting.
return common::visit(
common::visitors{
[](CharBlock cb1, CharBlock cb2) {
return cb1.begin() < cb2.begin();
},
[](CharBlock, const ProvenanceRange &) { return false; },
[](const ProvenanceRange &pr1, const ProvenanceRange &pr2) {
return pr1.start() < pr2.start();
},
[](const ProvenanceRange &, CharBlock) { return true; },
},
location_, that.location_);
}
bool Message::IsFatal() const {
return severity() == Severity::Error || severity() == Severity::Todo;
}
Severity Message::severity() const {
return common::visit(
common::visitors{
[](const MessageExpectedText &) { return Severity::Error; },
[](const MessageFixedText &x) { return x.severity(); },
[](const MessageFormattedText &x) { return x.severity(); },
},
text_);
}
Message &Message::set_severity(Severity severity) {
common::visit(
common::visitors{
[](const MessageExpectedText &) {},
[severity](MessageFixedText &x) { x.set_severity(severity); },
[severity](MessageFormattedText &x) { x.set_severity(severity); },
},
text_);
return *this;
}
std::string Message::ToString() const {
return common::visit(
common::visitors{
[](const MessageFixedText &t) {
return t.text().NULTerminatedToString();
},
[](const MessageFormattedText &t) { return t.string(); },
[](const MessageExpectedText &e) { return e.ToString(); },
},
text_);
}
void Message::ResolveProvenances(const AllCookedSources &allCooked) {
if (CharBlock * cb{std::get_if<CharBlock>(&location_)}) {
if (std::optional<ProvenanceRange> resolved{
allCooked.GetProvenanceRange(*cb)}) {
location_ = *resolved;
}
}
if (Message * attachment{attachment_.get()}) {
attachment->ResolveProvenances(allCooked);
}
}
std::optional<ProvenanceRange> Message::GetProvenanceRange(
const AllCookedSources &allCooked) const {
return common::visit(
common::visitors{
[&](CharBlock cb) { return allCooked.GetProvenanceRange(cb); },
[](const ProvenanceRange &pr) { return std::make_optional(pr); },
},
location_);
}
static std::string Prefix(Severity severity) {
switch (severity) {
case Severity::Error:
return "error: ";
case Severity::Warning:
return "warning: ";
case Severity::Portability:
return "portability: ";
case Severity::Because:
return "because: ";
case Severity::Context:
return "in the context: ";
case Severity::Todo:
return "error: not yet implemented: ";
case Severity::None:
break;
}
return "";
}
static llvm::raw_ostream::Colors PrefixColor(Severity severity) {
switch (severity) {
case Severity::Error:
case Severity::Todo:
return llvm::raw_ostream::RED;
case Severity::Warning:
case Severity::Portability:
return llvm::raw_ostream::MAGENTA;
default:
// TODO: Set the color.
break;
}
return llvm::raw_ostream::SAVEDCOLOR;
}
void Message::Emit(llvm::raw_ostream &o, const AllCookedSources &allCooked,
bool echoSourceLine) const {
std::optional<ProvenanceRange> provenanceRange{GetProvenanceRange(allCooked)};
const AllSources &sources{allCooked.allSources()};
sources.EmitMessage(o, provenanceRange, ToString(), Prefix(severity()),
PrefixColor(severity()), echoSourceLine);
bool isContext{attachmentIsContext_};
for (const Message *attachment{attachment_.get()}; attachment;
attachment = attachment->attachment_.get()) {
Severity severity = isContext ? Severity::Context : attachment->severity();
sources.EmitMessage(o, attachment->GetProvenanceRange(allCooked),
attachment->ToString(), Prefix(severity), PrefixColor(severity),
echoSourceLine);
}
}
// Messages are equal if they're for the same location and text, and the user
// visible aspects of their attachments are the same
bool Message::operator==(const Message &that) const {
if (!AtSameLocation(that) || ToString() != that.ToString() ||
severity() != that.severity() ||
attachmentIsContext_ != that.attachmentIsContext_) {
return false;
}
const Message *thatAttachment{that.attachment_.get()};
for (const Message *attachment{attachment_.get()}; attachment;
attachment = attachment->attachment_.get()) {
if (!thatAttachment || !attachment->AtSameLocation(*thatAttachment) ||
attachment->ToString() != thatAttachment->ToString() ||
attachment->severity() != thatAttachment->severity()) {
return false;
}
thatAttachment = thatAttachment->attachment_.get();
}
return !thatAttachment;
}
bool Message::Merge(const Message &that) {
return AtSameLocation(that) &&
(!that.attachment_.get() ||
attachment_.get() == that.attachment_.get()) &&
common::visit(
common::visitors{
[](MessageExpectedText &e1, const MessageExpectedText &e2) {
return e1.Merge(e2);
},
[](const auto &, const auto &) { return false; },
},
text_, that.text_);
}
Message &Message::Attach(Message *m) {
if (!attachment_) {
attachment_ = m;
} else {
if (attachment_->references() > 1) {
// Don't attach to a shared context attachment; copy it first.
attachment_ = new Message{*attachment_};
}
attachment_->Attach(m);
}
return *this;
}
Message &Message::Attach(std::unique_ptr<Message> &&m) {
return Attach(m.release());
}
bool Message::AtSameLocation(const Message &that) const {
return common::visit(
common::visitors{
[](CharBlock cb1, CharBlock cb2) {
return cb1.begin() == cb2.begin();
},
[](const ProvenanceRange &pr1, const ProvenanceRange &pr2) {
return pr1.start() == pr2.start();
},
[](const auto &, const auto &) { return false; },
},
location_, that.location_);
}
bool Messages::Merge(const Message &msg) {
if (msg.IsMergeable()) {
for (auto &m : messages_) {
if (m.Merge(msg)) {
return true;
}
}
}
return false;
}
void Messages::Merge(Messages &&that) {
if (messages_.empty()) {
*this = std::move(that);
} else {
while (!that.messages_.empty()) {
if (Merge(that.messages_.front())) {
that.messages_.pop_front();
} else {
auto next{that.messages_.begin()};
++next;
messages_.splice(
messages_.end(), that.messages_, that.messages_.begin(), next);
}
}
}
}
void Messages::Copy(const Messages &that) {
for (const Message &m : that.messages_) {
Message copy{m};
Say(std::move(copy));
}
}
void Messages::ResolveProvenances(const AllCookedSources &allCooked) {
for (Message &m : messages_) {
m.ResolveProvenances(allCooked);
}
}
void Messages::Emit(llvm::raw_ostream &o, const AllCookedSources &allCooked,
bool echoSourceLines) const {
std::vector<const Message *> sorted;
for (const auto &msg : messages_) {
sorted.push_back(&msg);
}
std::stable_sort(sorted.begin(), sorted.end(),
[](const Message *x, const Message *y) { return x->SortBefore(*y); });
const Message *lastMsg{nullptr};
for (const Message *msg : sorted) {
if (lastMsg && *msg == *lastMsg) {
// Don't emit two identical messages for the same location
continue;
}
msg->Emit(o, allCooked, echoSourceLines);
lastMsg = msg;
}
}
void Messages::AttachTo(Message &msg, std::optional<Severity> severity) {
for (Message &m : messages_) {
Message m2{std::move(m)};
if (severity) {
m2.set_severity(*severity);
}
msg.Attach(std::move(m2));
}
messages_.clear();
}
bool Messages::AnyFatalError() const {
for (const auto &msg : messages_) {
if (msg.IsFatal()) {
return true;
}
}
return false;
}
} // namespace Fortran::parser
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