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rewrite-parse-tree.cc
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// Copyright (c) 2018-2019, NVIDIA CORPORATION. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "rewrite-parse-tree.h"
#include "scope.h"
#include "semantics.h"
#include "symbol.h"
#include "tools.h"
#include "../common/indirection.h"
#include "../parser/parse-tree-visitor.h"
#include "../parser/parse-tree.h"
#include "../parser/tools.h"
#include <list>
namespace Fortran::semantics {
using namespace parser::literals;
/// Convert mis-identified statement functions to array element assignments.
/// Convert mis-identified format expressions to namelist group names.
/// Convert mis-identified character variables in I/O units to integer
/// unit number expressions.
class RewriteMutator {
public:
RewriteMutator(SemanticsContext &context)
: errorOnUnresolvedName_{!context.AnyFatalError()},
messages_{context.messages()} {}
// Default action for a parse tree node is to visit children.
template<typename T> bool Pre(T &) { return true; }
template<typename T> void Post(T &) {}
void Post(parser::Name &);
void Post(parser::SpecificationPart &);
bool Pre(parser::ExecutionPart &);
void Post(parser::IoUnit &);
void Post(parser::ReadStmt &);
void Post(parser::WriteStmt &);
// Name resolution yet implemented:
bool Pre(parser::EquivalenceStmt &) { return false; }
bool Pre(parser::Keyword &) { return false; }
bool Pre(parser::EntryStmt &) { return false; }
bool Pre(parser::CompilerDirective &) { return false; }
// Don't bother resolving names in end statements.
bool Pre(parser::EndBlockDataStmt &) { return false; }
bool Pre(parser::EndFunctionStmt &) { return false; }
bool Pre(parser::EndModuleStmt &) { return false; }
bool Pre(parser::EndMpSubprogramStmt &) { return false; }
bool Pre(parser::EndProgramStmt &) { return false; }
bool Pre(parser::EndSubmoduleStmt &) { return false; }
bool Pre(parser::EndSubroutineStmt &) { return false; }
bool Pre(parser::EndTypeStmt &) { return false; }
private:
using stmtFuncType =
parser::Statement<common::Indirection<parser::StmtFunctionStmt>>;
bool errorOnUnresolvedName_{true};
parser::Messages &messages_;
std::list<stmtFuncType> stmtFuncsToConvert_;
};
// Check that name has been resolved to a symbol
void RewriteMutator::Post(parser::Name &name) {
if (name.symbol == nullptr && errorOnUnresolvedName_) {
messages_.Say(name.source, "Internal: no symbol found for '%s'"_err_en_US,
name.source);
}
}
// Find mis-parsed statement functions and move to stmtFuncsToConvert_ list.
void RewriteMutator::Post(parser::SpecificationPart &x) {
auto &list{std::get<std::list<parser::DeclarationConstruct>>(x.t)};
for (auto it{list.begin()}; it != list.end();) {
if (auto stmt{std::get_if<stmtFuncType>(&it->u)}) {
Symbol *symbol{std::get<parser::Name>(stmt->statement.value().t).symbol};
if (symbol && symbol->has<ObjectEntityDetails>()) {
// not a stmt func: remove it here and add to ones to convert
stmtFuncsToConvert_.push_back(std::move(*stmt));
it = list.erase(it);
continue;
}
}
++it;
}
}
// Insert converted assignments at start of ExecutionPart.
bool RewriteMutator::Pre(parser::ExecutionPart &x) {
auto origFirst{x.v.begin()}; // insert each elem before origFirst
for (stmtFuncType &sf : stmtFuncsToConvert_) {
auto stmt{sf.statement.value().ConvertToAssignment()};
stmt.source = sf.source;
x.v.insert(origFirst,
parser::ExecutionPartConstruct{
parser::ExecutableConstruct{std::move(stmt)}});
}
stmtFuncsToConvert_.clear();
return true;
}
void RewriteMutator::Post(parser::IoUnit &x) {
if (auto *var{std::get_if<parser::Variable>(&x.u)}) {
const parser::Name &last{parser::GetLastName(*var)};
DeclTypeSpec *type{last.symbol ? last.symbol->GetType() : nullptr};
if (type == nullptr || type->category() != DeclTypeSpec::Character) {
// If the Variable is not known to be character (any kind), transform
// the I/O unit in situ to a FileUnitNumber so that automatic expression
// constraint checking will be applied.
auto expr{std::visit(
[](auto &&indirection) {
return parser::Expr{std::move(indirection)};
},
std::move(var->u))};
x.u = parser::FileUnitNumber{
parser::ScalarIntExpr{parser::IntExpr{std::move(expr)}}};
}
}
}
// When a namelist group name appears (without NML=) in a READ or WRITE
// statement in such a way that it can be misparsed as a format expression,
// rewrite the I/O statement's parse tree node as if the namelist group
// name had appeared with NML=.
template<typename READ_OR_WRITE>
void FixMisparsedUntaggedNamelistName(READ_OR_WRITE &x) {
if (x.iounit.has_value() && x.format.has_value() &&
std::holds_alternative<parser::DefaultCharExpr>(x.format->u)) {
if (const parser::Name * name{parser::Unwrap<parser::Name>(x.format)}) {
if (name->symbol != nullptr && name->symbol->has<NamelistDetails>()) {
x.controls.emplace_front(parser::IoControlSpec{std::move(*name)});
x.format.reset();
}
}
}
}
void RewriteMutator::Post(parser::ReadStmt &x) {
FixMisparsedUntaggedNamelistName(x);
}
void RewriteMutator::Post(parser::WriteStmt &x) {
FixMisparsedUntaggedNamelistName(x);
}
bool RewriteParseTree(SemanticsContext &context, parser::Program &program) {
RewriteMutator mutator{context};
parser::Walk(program, mutator);
return !context.AnyFatalError();
}
}