llvm/flang/lib/semantics/semantics.cc
Jean Perier 281d41cc10 [flang] Use value semantic for SourceName
Change all SourceName* to std::optional<SourceName> because
SourceName is small enough (16 bytes) to be passed and stored
by value which avoid having to worry about life-time, storage and
value constance issues that comes with pointers.

Original-commit: flang-compiler/f18@73fc08d7bd
Reviewed-on: https://github.com/flang-compiler/f18/pull/634
Tree-same-pre-rewrite: false
2019-08-21 05:33:03 -07:00

236 lines
7.2 KiB
C++

// 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 "semantics.h"
#include "assignment.h"
#include "canonicalize-do.h"
#include "canonicalize-omp.h"
#include "check-allocate.h"
#include "check-arithmeticif.h"
#include "check-coarray.h"
#include "check-deallocate.h"
#include "check-do.h"
#include "check-if-stmt.h"
#include "check-io.h"
#include "check-nullify.h"
#include "check-omp-structure.h"
#include "check-return.h"
#include "check-stop.h"
#include "expression.h"
#include "mod-file.h"
#include "resolve-labels.h"
#include "resolve-names.h"
#include "rewrite-parse-tree.h"
#include "scope.h"
#include "symbol.h"
#include "../common/default-kinds.h"
#include "../parser/parse-tree-visitor.h"
namespace Fortran::semantics {
static void DoDumpSymbols(std::ostream &, const Scope &, int indent = 0);
static void PutIndent(std::ostream &, int indent);
// A parse tree visitor that calls Enter/Leave functions from each checker
// class C supplied as template parameters. Enter is called before the node's
// children are visited, Leave is called after. No two checkers may have the
// same Enter or Leave function. Each checker must be constructible from
// SemanticsContext and have BaseChecker as a virtual base class.
template<typename... C> class SemanticsVisitor : public virtual C... {
public:
using C::Enter...;
using C::Leave...;
using BaseChecker::Enter;
using BaseChecker::Leave;
SemanticsVisitor(SemanticsContext &context)
: C{context}..., context_{context} {}
template<typename N> bool Pre(const N &node) {
Enter(node);
return true;
}
template<typename N> void Post(const N &node) { Leave(node); }
template<typename T> bool Pre(const parser::Statement<T> &node) {
context_.set_location(node.source);
Enter(node);
return true;
}
template<typename T> void Post(const parser::Statement<T> &node) {
Leave(node);
context_.set_location(std::nullopt);
}
bool Walk(const parser::Program &program) {
parser::Walk(program, *this);
return !context_.AnyFatalError();
}
private:
SemanticsContext &context_;
};
using StatementSemanticsPass1 = ExprChecker;
using StatementSemanticsPass2 = SemanticsVisitor<AllocateChecker,
ArithmeticIfStmtChecker, AssignmentChecker, CoarrayChecker,
DeallocateChecker, DoChecker, IfStmtChecker, IoChecker, NullifyChecker,
OmpStructureChecker, ReturnStmtChecker, StopChecker>;
static bool PerformStatementSemantics(
SemanticsContext &context, parser::Program &program) {
ResolveNames(context, program);
RewriteParseTree(context, program);
StatementSemanticsPass1{context}.Walk(program);
return StatementSemanticsPass2{context}.Walk(program);
}
SemanticsContext::SemanticsContext(
const common::IntrinsicTypeDefaultKinds &defaultKinds,
const parser::LanguageFeatureControl &languageFeatures,
parser::AllSources &allSources)
: defaultKinds_{defaultKinds}, languageFeatures_{languageFeatures},
allSources_{allSources},
intrinsics_{evaluate::IntrinsicProcTable::Configure(defaultKinds)},
foldingContext_{parser::ContextualMessages{&messages_}, defaultKinds} {}
SemanticsContext::~SemanticsContext() {}
int SemanticsContext::GetDefaultKind(TypeCategory category) const {
return defaultKinds_.GetDefaultKind(category);
}
bool SemanticsContext::IsEnabled(parser::LanguageFeature feature) const {
return languageFeatures_.IsEnabled(feature);
}
bool SemanticsContext::ShouldWarn(parser::LanguageFeature feature) const {
return languageFeatures_.ShouldWarn(feature);
}
const DeclTypeSpec &SemanticsContext::MakeNumericType(
TypeCategory category, int kind) {
if (kind == 0) {
kind = GetDefaultKind(category);
}
return globalScope_.MakeNumericType(category, KindExpr{kind});
}
const DeclTypeSpec &SemanticsContext::MakeLogicalType(int kind) {
if (kind == 0) {
kind = GetDefaultKind(TypeCategory::Logical);
}
return globalScope_.MakeLogicalType(KindExpr{kind});
}
bool SemanticsContext::AnyFatalError() const {
return !messages_.empty() &&
(warningsAreErrors_ || messages_.AnyFatalError());
}
bool SemanticsContext::HasError(const Symbol &symbol) {
return CheckError(symbol.test(Symbol::Flag::Error));
}
bool SemanticsContext::HasError(const Symbol *symbol) {
return CheckError(!symbol || HasError(*symbol));
}
bool SemanticsContext::HasError(const parser::Name &name) {
return HasError(name.symbol);
}
void SemanticsContext::SetError(Symbol &symbol, bool value) {
if (value) {
CHECK(AnyFatalError());
symbol.set(Symbol::Flag::Error);
}
}
bool SemanticsContext::CheckError(bool error) {
CHECK(!error || AnyFatalError());
return error;
}
const Scope &SemanticsContext::FindScope(parser::CharBlock source) const {
return const_cast<SemanticsContext *>(this)->FindScope(source);
}
Scope &SemanticsContext::FindScope(parser::CharBlock source) {
if (auto *scope{globalScope_.FindScope(source)}) {
return *scope;
} else {
common::die("invalid source location");
}
}
bool Semantics::Perform() {
return ValidateLabels(context_, program_) &&
parser::CanonicalizeDo(program_) && // force line break
CanonicalizeOmp(context_.messages(), program_) &&
PerformStatementSemantics(context_, program_) &&
ModFileWriter{context_}.WriteAll();
}
void Semantics::EmitMessages(std::ostream &os) const {
context_.messages().Emit(os, cooked_);
}
void Semantics::DumpSymbols(std::ostream &os) {
DoDumpSymbols(os, context_.globalScope());
}
void DoDumpSymbols(std::ostream &os, const Scope &scope, int indent) {
PutIndent(os, indent);
os << Scope::EnumToString(scope.kind()) << " scope:";
if (const auto *symbol{scope.symbol()}) {
os << ' ' << symbol->name().ToString();
}
os << '\n';
++indent;
for (const auto &pair : scope) {
const auto &symbol{*pair.second};
PutIndent(os, indent);
os << symbol << '\n';
if (const auto *details{symbol.detailsIf<GenericDetails>()}) {
if (const auto &type{details->derivedType()}) {
PutIndent(os, indent);
os << *type << '\n';
}
}
}
if (!scope.equivalenceSets().empty()) {
PutIndent(os, indent);
os << "Equivalence Sets:";
for (const auto &set : scope.equivalenceSets()) {
os << ' ';
char sep = '(';
for (const auto &object : set) {
os << sep << object.AsFortran();
sep = ',';
}
os << ')';
}
os << '\n';
}
for (const auto &pair : scope.commonBlocks()) {
const auto &symbol{*pair.second};
PutIndent(os, indent);
os << symbol << '\n';
}
for (const auto &child : scope.children()) {
DoDumpSymbols(os, child, indent);
}
--indent;
}
static void PutIndent(std::ostream &os, int indent) {
for (int i = 0; i < indent; ++i) {
os << " ";
}
}
}