cd03e96f00
Adds flang/include/flang/Common/log2-visit.h, which defines a Fortran::common::visit() template function that is a drop-in replacement for std::visit(). Modifies most use sites in the front-end and runtime to use common::visit(). The C++ standard mandates that std::visit() have O(1) execution time, which forces implementations to build dispatch tables. This new common::visit() is O(log2 N) in the number of alternatives in a variant<>, but that N tends to be small and so this change produces a fairly significant improvement in compiler build memory requirements, a 5-10% improvement in compiler build time, and a small improvement in compiler execution time. Building with -DFLANG_USE_STD_VISIT causes common::visit() to be an alias for std::visit(). Calls to common::visit() with multiple variant arguments are referred to std::visit(), pending further work. This change is enabled only for GCC builds with GCC >= 9; an earlier attempt (D122441) ran into bugs in some versions of clang and was reverted rather than simply disabled; and it is not well tested with MSVC. In non-GCC and older GCC builds, common::visit() is simply an alias for std::visit().
74 lines
2.9 KiB
C++
74 lines
2.9 KiB
C++
//===-- lib/Semantics/check-deallocate.cpp --------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "check-deallocate.h"
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#include "flang/Parser/message.h"
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#include "flang/Parser/parse-tree.h"
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#include "flang/Semantics/expression.h"
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#include "flang/Semantics/tools.h"
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namespace Fortran::semantics {
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void DeallocateChecker::Leave(const parser::DeallocateStmt &deallocateStmt) {
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for (const parser::AllocateObject &allocateObject :
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std::get<std::list<parser::AllocateObject>>(deallocateStmt.t)) {
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common::visit(
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common::visitors{
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[&](const parser::Name &name) {
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auto const *symbol{name.symbol};
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if (context_.HasError(symbol)) {
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// already reported an error
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} else if (!IsVariableName(*symbol)) {
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context_.Say(name.source,
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"name in DEALLOCATE statement must be a variable name"_err_en_US);
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} else if (!IsAllocatableOrPointer(*symbol)) { // C932
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context_.Say(name.source,
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"name in DEALLOCATE statement must have the ALLOCATABLE or POINTER attribute"_err_en_US);
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} else {
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context_.CheckIndexVarRedefine(name);
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}
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},
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[&](const parser::StructureComponent &structureComponent) {
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// Only perform structureComponent checks it was successfully
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// analyzed in expression analysis.
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if (GetExpr(context_, allocateObject)) {
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if (!IsAllocatableOrPointer(
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*structureComponent.component.symbol)) { // C932
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context_.Say(structureComponent.component.source,
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"component in DEALLOCATE statement must have the ALLOCATABLE or POINTER attribute"_err_en_US);
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}
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}
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},
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},
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allocateObject.u);
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}
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bool gotStat{false}, gotMsg{false};
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for (const parser::StatOrErrmsg &deallocOpt :
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std::get<std::list<parser::StatOrErrmsg>>(deallocateStmt.t)) {
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common::visit(
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common::visitors{
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[&](const parser::StatVariable &) {
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if (gotStat) {
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context_.Say(
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"STAT may not be duplicated in a DEALLOCATE statement"_err_en_US);
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}
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gotStat = true;
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},
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[&](const parser::MsgVariable &) {
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if (gotMsg) {
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context_.Say(
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"ERRMSG may not be duplicated in a DEALLOCATE statement"_err_en_US);
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}
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gotMsg = true;
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},
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},
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deallocOpt.u);
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}
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}
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} // namespace Fortran::semantics
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