canonicalize-acc.cpp
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//===-- lib/Semantics/canonicalize-acc.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 "canonicalize-acc.h"
#include "flang/Parser/parse-tree-visitor.h"
#include "flang/Semantics/tools.h"
// After Loop Canonicalization, rewrite OpenACC parse tree to make OpenACC
// Constructs more structured which provide explicit scopes for later
// structural checks and semantic analysis.
// 1. move structured DoConstruct into
// OpenACCLoopConstruct. Compilation will not proceed in case of errors
// after this pass.
namespace Fortran::semantics {
using namespace parser::literals;
class CanonicalizationOfAcc {
public:
template <typename T> bool Pre(T &) { return true; }
template <typename T> void Post(T &) {}
CanonicalizationOfAcc(parser::Messages &messages) : messages_{messages} {}
void Post(parser::Block &block) {
for (auto it{block.begin()}; it != block.end(); ++it) {
if (auto *accLoop{parser::Unwrap<parser::OpenACCLoopConstruct>(*it)}) {
RewriteOpenACCLoopConstruct(*accLoop, block, it);
}
} // Block list
}
private:
void RewriteOpenACCLoopConstruct(parser::OpenACCLoopConstruct &x,
parser::Block &block, parser::Block::iterator it) {
// Check the sequence of DoConstruct in the same iteration
//
// Original:
// ExecutableConstruct -> OpenACCConstruct -> OpenACCLoopConstruct
// ACCBeginLoopDirective
// ExecutableConstruct -> DoConstruct
//
// After rewriting:
// ExecutableConstruct -> OpenACCConstruct -> OpenACCLoopConstruct
// AccBeginLoopDirective
// DoConstruct
parser::Block::iterator nextIt;
auto &beginDir{std::get<parser::AccBeginLoopDirective>(x.t)};
auto &dir{std::get<parser::AccLoopDirective>(beginDir.t)};
nextIt = it;
if (++nextIt != block.end()) {
if (auto *doCons{parser::Unwrap<parser::DoConstruct>(*nextIt)}) {
if (doCons->GetLoopControl()) {
// move DoConstruct
std::get<std::optional<parser::DoConstruct>>(x.t) =
std::move(*doCons);
nextIt = block.erase(nextIt);
} else {
messages_.Say(dir.source,
"DO loop after the %s directive must have loop control"_err_en_US,
parser::ToUpperCaseLetters(dir.source.ToString()));
}
return; // found do-loop
}
}
messages_.Say(dir.source,
"A DO loop must follow the %s directive"_err_en_US,
parser::ToUpperCaseLetters(dir.source.ToString()));
}
parser::Messages &messages_;
};
bool CanonicalizeAcc(parser::Messages &messages, parser::Program &program) {
CanonicalizationOfAcc acc{messages};
Walk(program, acc);
return !messages.AnyFatalError();
}
} // namespace Fortran::semantics