d28de0d7f2
This patch implements the first frontend action for the Flang parser (i.e.
Fortran::parser). This action runs the preprocessor and is invoked with the
`-E` flag. (i.e. `flang-new -E <input-file>). The generated output is printed
to either stdout or the output file (specified with `-` or `-o <output-file>`).
Note that currently there is no mechanism to map options for the
frontend driver (i.e. Fortran::frontend::FrontendOptions) to options for
the parser (i.e. Fortran::parser::Options). Instead,
Frotran::parser::options are hard-coded to:
```
std::vector<std::string> searchDirectories{"."s};
searchDirectories = searchDirectories;
isFixedForm = false;
_encoding(Fortran::parser::Encoding::UTF_8);
```
These default settings are compatible with the current Flang driver. Further
work is required in order for CompilerInvocation to read and map
clang::driver::options to Fortran::parser::options.
Co-authored-by: Andrzej Warzynski <andrzej.warzynski@arm.com>
Differential Revision: https://reviews.llvm.org/D88381
70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
//===--- FrontendAction.cpp -----------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "flang/Frontend/FrontendAction.h"
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#include "flang/Frontend/CompilerInstance.h"
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#include "flang/Frontend/FrontendActions.h"
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#include "llvm/Support/Errc.h"
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using namespace Fortran::frontend;
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void FrontendAction::set_currentInput(const FrontendInputFile ¤tInput) {
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this->currentInput_ = currentInput;
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}
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// Call this method if BeginSourceFile fails.
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// Deallocate compiler instance, input and output descriptors
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static void BeginSourceFileCleanUp(FrontendAction &fa, CompilerInstance &ci) {
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ci.ClearOutputFiles(/*EraseFiles=*/true);
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fa.set_currentInput(FrontendInputFile());
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fa.set_instance(nullptr);
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}
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bool FrontendAction::BeginSourceFile(
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CompilerInstance &ci, const FrontendInputFile &realInput) {
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FrontendInputFile input(realInput);
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assert(!instance_ && "Already processing a source file!");
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assert(!realInput.IsEmpty() && "Unexpected empty filename!");
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set_currentInput(realInput);
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set_instance(&ci);
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if (!ci.HasAllSources()) {
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BeginSourceFileCleanUp(*this, ci);
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return false;
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}
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return true;
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}
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bool FrontendAction::ShouldEraseOutputFiles() {
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return instance().diagnostics().hasErrorOccurred();
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}
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llvm::Error FrontendAction::Execute() {
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std::string currentInputPath{GetCurrentFileOrBufferName()};
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Fortran::parser::Options parserOptions =
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this->instance().invocation().fortranOpts();
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this->instance().parsing().Prescan(currentInputPath, parserOptions);
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ExecuteAction();
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return llvm::Error::success();
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}
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void FrontendAction::EndSourceFile() {
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CompilerInstance &ci = instance();
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// Cleanup the output streams, and erase the output files if instructed by the
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// FrontendAction.
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ci.ClearOutputFiles(/*EraseFiles=*/ShouldEraseOutputFiles());
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set_instance(nullptr);
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set_currentInput(FrontendInputFile());
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}
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