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//===-- lib/Semantics/canonicalize-do.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-do.h"
#include "flang/Parser/parse-tree-visitor.h"
namespace Fortran::parser {
class CanonicalizationOfDoLoops {
struct LabelInfo {
Block::iterator iter;
Label label;
};
public:
template <typename T> bool Pre(T &) { return true; }
template <typename T> void Post(T &) {}
void Post(Block &block) {
std::vector<LabelInfo> stack;
for (auto i{block.begin()}, end{block.end()}; i != end; ++i) {
if (auto *executableConstruct{std::get_if<ExecutableConstruct>(&i->u)}) {
common::visit(
common::visitors{
[](auto &) {},
// Labels on end-stmt of constructs are accepted by f18 as an
// extension.
[&](common::Indirection<AssociateConstruct> &associate) {
CanonicalizeIfMatch(block, stack, i,
std::get<Statement<EndAssociateStmt>>(
associate.value().t));
},
[&](common::Indirection<BlockConstruct> &blockConstruct) {
CanonicalizeIfMatch(block, stack, i,
std::get<Statement<EndBlockStmt>>(
blockConstruct.value().t));
},
[&](common::Indirection<ChangeTeamConstruct> &changeTeam) {
CanonicalizeIfMatch(block, stack, i,
std::get<Statement<EndChangeTeamStmt>>(
changeTeam.value().t));
},
[&](common::Indirection<CriticalConstruct> &critical) {
CanonicalizeIfMatch(block, stack, i,
std::get<Statement<EndCriticalStmt>>(critical.value().t));
},
[&](common::Indirection<DoConstruct> &doConstruct) {
CanonicalizeIfMatch(block, stack, i,
std::get<Statement<EndDoStmt>>(doConstruct.value().t));
},
[&](common::Indirection<IfConstruct> &ifConstruct) {
CanonicalizeIfMatch(block, stack, i,
std::get<Statement<EndIfStmt>>(ifConstruct.value().t));
},
[&](common::Indirection<CaseConstruct> &caseConstruct) {
CanonicalizeIfMatch(block, stack, i,
std::get<Statement<EndSelectStmt>>(
caseConstruct.value().t));
},
[&](common::Indirection<SelectRankConstruct> &selectRank) {
CanonicalizeIfMatch(block, stack, i,
std::get<Statement<EndSelectStmt>>(selectRank.value().t));
},
[&](common::Indirection<SelectTypeConstruct> &selectType) {
CanonicalizeIfMatch(block, stack, i,
std::get<Statement<EndSelectStmt>>(selectType.value().t));
},
[&](common::Indirection<ForallConstruct> &forall) {
CanonicalizeIfMatch(block, stack, i,
std::get<Statement<EndForallStmt>>(forall.value().t));
},
[&](common::Indirection<WhereConstruct> &where) {
CanonicalizeIfMatch(block, stack, i,
std::get<Statement<EndWhereStmt>>(where.value().t));
},
[&](Statement<common::Indirection<LabelDoStmt>> &labelDoStmt) {
auto &label{std::get<Label>(labelDoStmt.statement.value().t)};
stack.push_back(LabelInfo{i, label});
},
[&](Statement<common::Indirection<EndDoStmt>> &endDoStmt) {
CanonicalizeIfMatch(block, stack, i, endDoStmt);
},
[&](Statement<ActionStmt> &actionStmt) {
CanonicalizeIfMatch(block, stack, i, actionStmt);
},
},
executableConstruct->u);
}
}
}
private:
template <typename T>
void CanonicalizeIfMatch(Block &originalBlock, std::vector<LabelInfo> &stack,
Block::iterator &i, Statement<T> &statement) {
if (!stack.empty() && statement.label &&
stack.back().label == *statement.label) {
auto currentLabel{stack.back().label};
if constexpr (std::is_same_v<T, common::Indirection<EndDoStmt>>) {
std::get<ExecutableConstruct>(i->u).u = Statement<ActionStmt>{
std::optional<Label>{currentLabel}, ContinueStmt{}};
}
auto next{++i};
do {
Block block;
auto doLoop{stack.back().iter};
auto originalSource{
std::get<Statement<common::Indirection<LabelDoStmt>>>(
std::get<ExecutableConstruct>(doLoop->u).u)
.source};
block.splice(block.begin(), originalBlock, ++stack.back().iter, next);
auto &labelDo{std::get<Statement<common::Indirection<LabelDoStmt>>>(
std::get<ExecutableConstruct>(doLoop->u).u)};
auto &loopControl{
std::get<std::optional<LoopControl>>(labelDo.statement.value().t)};
auto &name{std::get<std::optional<Name>>(labelDo.statement.value().t)};
Statement<NonLabelDoStmt> nonLabelDoStmt{std::move(labelDo.label),
NonLabelDoStmt{
std::make_tuple(common::Clone(name), std::move(loopControl))}};
nonLabelDoStmt.source = originalSource;
std::get<ExecutableConstruct>(doLoop->u).u =
common::Indirection<DoConstruct>{
std::make_tuple(std::move(nonLabelDoStmt), std::move(block),
Statement<EndDoStmt>{
std::optional<Label>{}, EndDoStmt{std::move(name)}})};
stack.pop_back();
} while (!stack.empty() && stack.back().label == currentLabel);
i = --next;
}
}
};
bool CanonicalizeDo(Program &program) {
CanonicalizationOfDoLoops canonicalizationOfDoLoops;
Walk(program, canonicalizationOfDoLoops);
return true;
}
} // namespace Fortran::parser
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