1 //===-- lib/Semantics/check-deallocate.cpp --------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "check-deallocate.h"
10 #include "flang/Parser/message.h"
11 #include "flang/Parser/parse-tree.h"
12 #include "flang/Semantics/expression.h"
13 #include "flang/Semantics/tools.h"
14 
15 namespace Fortran::semantics {
16 
17 void DeallocateChecker::Leave(const parser::DeallocateStmt &deallocateStmt) {
18   for (const parser::AllocateObject &allocateObject :
19       std::get<std::list<parser::AllocateObject>>(deallocateStmt.t)) {
20     std::visit(
21         common::visitors{
22             [&](const parser::Name &name) {
23               auto const *symbol{name.symbol};
24               if (context_.HasError(symbol)) {
25                 // already reported an error
26               } else if (!IsVariableName(*symbol)) {
27                 context_.Say(name.source,
28                     "name in DEALLOCATE statement must be a variable name"_err_en_US);
29               } else if (!IsAllocatableOrPointer(*symbol)) { // C932
30                 context_.Say(name.source,
31                     "name in DEALLOCATE statement must have the ALLOCATABLE or POINTER attribute"_err_en_US);
32               } else {
33                 context_.CheckIndexVarRedefine(name);
34               }
35             },
36             [&](const parser::StructureComponent &structureComponent) {
37               evaluate::ExpressionAnalyzer analyzer{context_};
38               if (MaybeExpr checked{analyzer.Analyze(structureComponent)}) {
39                 if (!IsAllocatableOrPointer(
40                         *structureComponent.component.symbol)) { // C932
41                   context_.Say(structureComponent.component.source,
42                       "component in DEALLOCATE statement must have the ALLOCATABLE or POINTER attribute"_err_en_US);
43                 }
44               }
45             },
46         },
47         allocateObject.u);
48   }
49   bool gotStat{false}, gotMsg{false};
50   for (const parser::StatOrErrmsg &deallocOpt :
51       std::get<std::list<parser::StatOrErrmsg>>(deallocateStmt.t)) {
52     std::visit(
53         common::visitors{
54             [&](const parser::StatVariable &) {
55               if (gotStat) {
56                 context_.Say(
57                     "STAT may not be duplicated in a DEALLOCATE statement"_err_en_US);
58               }
59               gotStat = true;
60             },
61             [&](const parser::MsgVariable &) {
62               if (gotMsg) {
63                 context_.Say(
64                     "ERRMSG may not be duplicated in a DEALLOCATE statement"_err_en_US);
65               }
66               gotMsg = true;
67             },
68         },
69         deallocOpt.u);
70   }
71 }
72 } // namespace Fortran::semantics
73