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//===-- lib/Parser/parsing.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/parsing.h"
#include "preprocessor.h"
#include "prescan.h"
#include "type-parsers.h"
#include "flang/Parser/message.h"
#include "flang/Parser/provenance.h"
#include "flang/Parser/source.h"
#include "llvm/Support/raw_ostream.h"
namespace Fortran::parser {
Parsing::Parsing(AllSources &s) : cooked_{s} {}
Parsing::~Parsing() {}
const SourceFile *Parsing::Prescan(const std::string &path, Options options) {
options_ = options;
AllSources &allSources{cooked_.allSources()};
if (options.isModuleFile) {
for (const auto &path : options.searchDirectories) {
allSources.PushSearchPathDirectory(path);
}
}
std::string buf;
llvm::raw_string_ostream fileError{buf};
const SourceFile *sourceFile;
if (path == "-") {
sourceFile = allSources.ReadStandardInput(fileError);
} else {
sourceFile = allSources.Open(path, fileError);
}
if (!fileError.str().empty()) {
ProvenanceRange range{allSources.AddCompilerInsertion(path)};
messages_.Say(range, "%s"_err_en_US, fileError.str());
return sourceFile;
}
CHECK(sourceFile);
if (!options.isModuleFile) {
// For .mod files we always want to look in the search directories.
// For normal source files we don't push them until after the primary
// source file has been opened. If foo.f is missing from the current
// working directory, we don't want to accidentally read another foo.f
// from another directory that's on the search path.
for (const auto &path : options.searchDirectories) {
allSources.PushSearchPathDirectory(path);
}
}
Preprocessor preprocessor{allSources};
for (const auto &predef : options.predefinitions) {
if (predef.second) {
preprocessor.Define(predef.first, *predef.second);
} else {
preprocessor.Undefine(predef.first);
}
}
Prescanner prescanner{messages_, cooked_, preprocessor, options.features};
prescanner.set_fixedForm(options.isFixedForm)
.set_fixedFormColumnLimit(options.fixedFormColumns)
.AddCompilerDirectiveSentinel("dir$");
if (options.features.IsEnabled(LanguageFeature::OpenACC)) {
prescanner.AddCompilerDirectiveSentinel("$acc");
}
if (options.features.IsEnabled(LanguageFeature::OpenMP)) {
prescanner.AddCompilerDirectiveSentinel("$omp");
prescanner.AddCompilerDirectiveSentinel("$"); // OMP conditional line
}
ProvenanceRange range{allSources.AddIncludedFile(
*sourceFile, ProvenanceRange{}, options.isModuleFile)};
prescanner.Prescan(range);
if (cooked_.BufferedBytes() == 0 && !options.isModuleFile) {
// Input is empty. Append a newline so that any warning
// message about nonstandard usage will have provenance.
cooked_.Put('\n', range.start());
}
cooked_.Marshal();
if (options.needProvenanceRangeToCharBlockMappings) {
cooked_.CompileProvenanceRangeToOffsetMappings();
}
return sourceFile;
}
void Parsing::DumpCookedChars(llvm::raw_ostream &out) const {
UserState userState{cooked_, common::LanguageFeatureControl{}};
ParseState parseState{cooked_};
parseState.set_inFixedForm(options_.isFixedForm).set_userState(&userState);
while (std::optional<const char *> p{parseState.GetNextChar()}) {
out << **p;
}
}
void Parsing::DumpProvenance(llvm::raw_ostream &out) const {
cooked_.Dump(out);
}
void Parsing::DumpParsingLog(llvm::raw_ostream &out) const {
log_.Dump(out, cooked_);
}
void Parsing::Parse(llvm::raw_ostream &out) {
UserState userState{cooked_, options_.features};
userState.set_debugOutput(out)
.set_instrumentedParse(options_.instrumentedParse)
.set_log(&log_);
ParseState parseState{cooked_};
parseState.set_inFixedForm(options_.isFixedForm).set_userState(&userState);
parseTree_ = program.Parse(parseState);
CHECK(
!parseState.anyErrorRecovery() || parseState.messages().AnyFatalError());
consumedWholeFile_ = parseState.IsAtEnd();
messages_.Annex(std::move(parseState.messages()));
finalRestingPlace_ = parseState.GetLocation();
}
void Parsing::ClearLog() { log_.clear(); }
bool Parsing::ForTesting(std::string path, llvm::raw_ostream &err) {
llvm::raw_null_ostream NullStream;
Prescan(path, Options{});
if (messages_.AnyFatalError()) {
messages_.Emit(err, cooked_);
err << "could not scan " << path << '\n';
return false;
}
Parse(NullStream);
messages_.Emit(err, cooked_);
if (!consumedWholeFile_) {
EmitMessage(err, finalRestingPlace_, "parser FAIL; final position");
return false;
}
if (messages_.AnyFatalError() || !parseTree_.has_value()) {
err << "could not parse " << path << '\n';
return false;
}
return true;
}
} // namespace Fortran::parser
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