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//===-- fc1_main.cpp - Flang FC1 Compiler Frontend ------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This is the entry point to the flang -fc1 functionality, which implements the
// core compiler functionality along with a number of additional tools for
// demonstration and testing purposes.
//
//===----------------------------------------------------------------------===//
//
// Coding style: https://mlir.llvm.org/getting_started/DeveloperGuide/
//
//===----------------------------------------------------------------------===//
#include "flang/Frontend/CompilerInstance.h"
#include "flang/Frontend/CompilerInvocation.h"
#include "flang/Frontend/TextDiagnosticBuffer.h"
#include "flang/FrontendTool/Utils.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/OptTable.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdio>
using namespace Fortran::frontend;
/// Print supported cpus of the given target.
static int printSupportedCPUs(llvm::StringRef triple) {
std::string error;
const llvm::Target *target =
llvm::TargetRegistry::lookupTarget(triple, error);
if (!target) {
llvm::errs() << error;
return 1;
}
// the target machine will handle the mcpu printing
llvm::TargetOptions targetOpts;
std::unique_ptr<llvm::TargetMachine> targetMachine(
target->createTargetMachine(triple, "", "+cpuhelp", targetOpts,
std::nullopt));
return 0;
}
int fc1_main(llvm::ArrayRef<const char *> argv, const char *argv0) {
// Create CompilerInstance
std::unique_ptr<CompilerInstance> flang(new CompilerInstance());
// Create DiagnosticsEngine for the frontend driver
flang->createDiagnostics();
if (!flang->hasDiagnostics())
return 1;
// We will buffer diagnostics from argument parsing so that we can output
// them using a well formed diagnostic object.
TextDiagnosticBuffer *diagsBuffer = new TextDiagnosticBuffer;
// Create CompilerInvocation - use a dedicated instance of DiagnosticsEngine
// for parsing the arguments
llvm::IntrusiveRefCntPtr<clang::DiagnosticIDs> diagID(
new clang::DiagnosticIDs());
llvm::IntrusiveRefCntPtr<clang::DiagnosticOptions> diagOpts =
new clang::DiagnosticOptions();
clang::DiagnosticsEngine diags(diagID, &*diagOpts, diagsBuffer);
bool success = CompilerInvocation::createFromArgs(flang->getInvocation(),
argv, diags, argv0);
// Initialize targets first, so that --version shows registered targets.
llvm::InitializeAllTargets();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmPrinters();
// --print-supported-cpus takes priority over the actual compilation.
if (flang->getFrontendOpts().printSupportedCPUs)
return printSupportedCPUs(flang->getInvocation().getTargetOpts().triple);
diagsBuffer->flushDiagnostics(flang->getDiagnostics());
if (!success)
return 1;
// Execute the frontend actions.
success = executeCompilerInvocation(flang.get());
// Delete output files to free Compiler Instance
flang->clearOutputFiles(/*EraseFiles=*/false);
return !success;
}
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