program-tree.cpp
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//===-- lib/Semantics/program-tree.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 "program-tree.h"
#include "flang/Common/idioms.h"
#include "flang/Parser/char-block.h"
#include "flang/Semantics/scope.h"
namespace Fortran::semantics {
template <typename T>
static ProgramTree BuildSubprogramTree(const parser::Name &name, const T &x) {
const auto &spec{std::get<parser::SpecificationPart>(x.t)};
const auto &exec{std::get<parser::ExecutionPart>(x.t)};
const auto &subps{
std::get<std::optional<parser::InternalSubprogramPart>>(x.t)};
ProgramTree node{name, spec, &exec};
if (subps) {
for (const auto &subp :
std::get<std::list<parser::InternalSubprogram>>(subps->t)) {
std::visit(
[&](const auto &y) { node.AddChild(ProgramTree::Build(y.value())); },
subp.u);
}
}
return node;
}
static ProgramTree BuildSubprogramTree(
const parser::Name &name, const parser::BlockData &x) {
const auto &spec{std::get<parser::SpecificationPart>(x.t)};
return ProgramTree{name, spec, nullptr};
}
template <typename T>
static ProgramTree BuildModuleTree(const parser::Name &name, const T &x) {
const auto &spec{std::get<parser::SpecificationPart>(x.t)};
const auto &subps{std::get<std::optional<parser::ModuleSubprogramPart>>(x.t)};
ProgramTree node{name, spec};
if (subps) {
for (const auto &subp :
std::get<std::list<parser::ModuleSubprogram>>(subps->t)) {
std::visit(
[&](const auto &y) { node.AddChild(ProgramTree::Build(y.value())); },
subp.u);
}
}
return node;
}
ProgramTree ProgramTree::Build(const parser::ProgramUnit &x) {
return std::visit([](const auto &y) { return Build(y.value()); }, x.u);
}
ProgramTree ProgramTree::Build(const parser::MainProgram &x) {
const auto &stmt{
std::get<std::optional<parser::Statement<parser::ProgramStmt>>>(x.t)};
const auto &end{std::get<parser::Statement<parser::EndProgramStmt>>(x.t)};
static parser::Name emptyName;
auto result{stmt ? BuildSubprogramTree(stmt->statement.v, x).set_stmt(*stmt)
: BuildSubprogramTree(emptyName, x)};
return result.set_endStmt(end);
}
ProgramTree ProgramTree::Build(const parser::FunctionSubprogram &x) {
const auto &stmt{std::get<parser::Statement<parser::FunctionStmt>>(x.t)};
const auto &end{std::get<parser::Statement<parser::EndFunctionStmt>>(x.t)};
const auto &name{std::get<parser::Name>(stmt.statement.t)};
return BuildSubprogramTree(name, x).set_stmt(stmt).set_endStmt(end);
}
ProgramTree ProgramTree::Build(const parser::SubroutineSubprogram &x) {
const auto &stmt{std::get<parser::Statement<parser::SubroutineStmt>>(x.t)};
const auto &end{std::get<parser::Statement<parser::EndSubroutineStmt>>(x.t)};
const auto &name{std::get<parser::Name>(stmt.statement.t)};
return BuildSubprogramTree(name, x).set_stmt(stmt).set_endStmt(end);
}
ProgramTree ProgramTree::Build(const parser::SeparateModuleSubprogram &x) {
const auto &stmt{std::get<parser::Statement<parser::MpSubprogramStmt>>(x.t)};
const auto &end{
std::get<parser::Statement<parser::EndMpSubprogramStmt>>(x.t)};
const auto &name{stmt.statement.v};
return BuildSubprogramTree(name, x).set_stmt(stmt).set_endStmt(end);
}
ProgramTree ProgramTree::Build(const parser::Module &x) {
const auto &stmt{std::get<parser::Statement<parser::ModuleStmt>>(x.t)};
const auto &end{std::get<parser::Statement<parser::EndModuleStmt>>(x.t)};
const auto &name{stmt.statement.v};
return BuildModuleTree(name, x).set_stmt(stmt).set_endStmt(end);
}
ProgramTree ProgramTree::Build(const parser::Submodule &x) {
const auto &stmt{std::get<parser::Statement<parser::SubmoduleStmt>>(x.t)};
const auto &end{std::get<parser::Statement<parser::EndSubmoduleStmt>>(x.t)};
const auto &name{std::get<parser::Name>(stmt.statement.t)};
return BuildModuleTree(name, x).set_stmt(stmt).set_endStmt(end);
}
ProgramTree ProgramTree::Build(const parser::BlockData &x) {
const auto &stmt{std::get<parser::Statement<parser::BlockDataStmt>>(x.t)};
const auto &end{std::get<parser::Statement<parser::EndBlockDataStmt>>(x.t)};
static parser::Name emptyName;
auto result{stmt.statement.v ? BuildSubprogramTree(*stmt.statement.v, x)
: BuildSubprogramTree(emptyName, x)};
return result.set_stmt(stmt).set_endStmt(end);
}
ProgramTree ProgramTree::Build(const parser::CompilerDirective &) {
DIE("ProgramTree::Build() called for CompilerDirective");
}
const parser::ParentIdentifier &ProgramTree::GetParentId() const {
const auto *stmt{
std::get<const parser::Statement<parser::SubmoduleStmt> *>(stmt_)};
return std::get<parser::ParentIdentifier>(stmt->statement.t);
}
bool ProgramTree::IsModule() const {
auto kind{GetKind()};
return kind == Kind::Module || kind == Kind::Submodule;
}
Symbol::Flag ProgramTree::GetSubpFlag() const {
return GetKind() == Kind::Function ? Symbol::Flag::Function
: Symbol::Flag::Subroutine;
}
bool ProgramTree::HasModulePrefix() const {
using ListType = std::list<parser::PrefixSpec>;
const auto *prefixes{
std::visit(common::visitors{
[](const parser::Statement<parser::FunctionStmt> *x) {
return &std::get<ListType>(x->statement.t);
},
[](const parser::Statement<parser::SubroutineStmt> *x) {
return &std::get<ListType>(x->statement.t);
},
[](const auto *) -> const ListType * { return nullptr; },
},
stmt_)};
if (prefixes) {
for (const auto &prefix : *prefixes) {
if (std::holds_alternative<parser::PrefixSpec::Module>(prefix.u)) {
return true;
}
}
}
return false;
}
ProgramTree::Kind ProgramTree::GetKind() const {
return std::visit(
common::visitors{
[](const parser::Statement<parser::ProgramStmt> *) {
return Kind::Program;
},
[](const parser::Statement<parser::FunctionStmt> *) {
return Kind::Function;
},
[](const parser::Statement<parser::SubroutineStmt> *) {
return Kind::Subroutine;
},
[](const parser::Statement<parser::MpSubprogramStmt> *) {
return Kind::MpSubprogram;
},
[](const parser::Statement<parser::ModuleStmt> *) {
return Kind::Module;
},
[](const parser::Statement<parser::SubmoduleStmt> *) {
return Kind::Submodule;
},
[](const parser::Statement<parser::BlockDataStmt> *) {
return Kind::BlockData;
},
},
stmt_);
}
void ProgramTree::set_scope(Scope &scope) {
scope_ = &scope;
CHECK(endStmt_);
scope.AddSourceRange(*endStmt_);
}
void ProgramTree::AddChild(ProgramTree &&child) {
children_.emplace_back(std::move(child));
}
} // namespace Fortran::semantics