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//===- Scope.cpp - Lexical scope information ------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Scope class, which is used for recording information
// about a lexical scope.
//
//===----------------------------------------------------------------------===//
#include "flang/Sema/Scope.h"
#include "flang/AST/Expr.h"
#include "flang/AST/StorageSet.h"
#include <limits>
namespace flang {
static StmtLabelInteger GetStmtLabelValue(const Expr *E) {
if(const IntegerConstantExpr *IExpr =
dyn_cast<IntegerConstantExpr>(E)) {
return StmtLabelInteger(
IExpr->getValue().getLimitedValue(
std::numeric_limits<StmtLabelInteger>::max()));
} else {
llvm_unreachable("Invalid stmt label expression");
return 0;
}
}
void StmtLabelScope::setParent(StmtLabelScope *P) {
assert(!Parent);
Parent = P;
}
/// \brief Declares a new statement label.
void StmtLabelScope::Declare(Expr *StmtLabel, Stmt *Statement) {
auto Key = GetStmtLabelValue(StmtLabel);
StmtLabelDeclsInScope.insert(std::make_pair(Key,Statement));
}
/// \brief Tries to resolve a statement label reference.
Stmt *StmtLabelScope::Resolve(Expr *StmtLabel) const {
auto Key = GetStmtLabelValue(StmtLabel);
auto Result = StmtLabelDeclsInScope.find(Key);
if(Result == StmtLabelDeclsInScope.end()) return nullptr;
Result->second->setStmtLabelUsed();
return Result->second;
}
/// \brief Declares a forward reference of some statement label.
void StmtLabelScope::DeclareForwardReference(ForwardDecl Reference) {
ForwardStmtLabelDeclsInScope.append(1,Reference);
}
/// \brief Removes a forward reference of some statement label.
void StmtLabelScope::RemoveForwardReference(const Stmt *User) {
for(size_t I = 0; I < ForwardStmtLabelDeclsInScope.size(); ++I) {
if(ForwardStmtLabelDeclsInScope[I].Statement == User) {
ForwardStmtLabelDeclsInScope.erase(ForwardStmtLabelDeclsInScope.begin() + I);
return;
}
}
}
/// \brief Returns true is the two statement labels are identical.
bool StmtLabelScope::IsSame(const Expr *StmtLabelA,
const Expr *StmtLabelB) const {
return GetStmtLabelValue(StmtLabelA) == GetStmtLabelValue(StmtLabelB);
}
void ConstructNameScope::setParent(ConstructNameScope *P) {
Parent = P;
}
void ConstructNameScope::Declare(const IdentifierInfo *Name, NamedConstructStmt *Construct) {
Constructs.insert(std::make_pair(Name, Construct));
}
NamedConstructStmt *ConstructNameScope::Resolve(const IdentifierInfo *ConstructName) const {
auto Result = Constructs.find(ConstructName);
if(Result == Constructs.end()) return nullptr;
return Result->second;
}
ImplicitTypingScope::ImplicitTypingScope(ImplicitTypingScope *Prev)
: Parent(Prev), None(false) {
}
void ImplicitTypingScope::setParent(ImplicitTypingScope *P) {
assert(!Parent);
Parent = P;
}
bool ImplicitTypingScope::Apply(const ImplicitStmt::LetterSpecTy &Spec, QualType T) {
if(None) return false;
char Low = toupper((Spec.first->getNameStart())[0]);
if(Spec.second) {
char High = toupper((Spec.second->getNameStart())[0]);
for(; Low <= High; ++Low) {
llvm::StringRef Key(&Low, 1);
if(Rules.find(Key) != Rules.end())
return false;
Rules[Key] = T;
}
} else {
llvm::StringRef Key(&Low, 1);
if(Rules.find(Key) != Rules.end())
return false;
Rules[Key] = T;
}
return true;
}
bool ImplicitTypingScope::ApplyNone() {
if(Rules.size()) return false;
None = true;
return true;
}
std::pair<ImplicitTypingScope::RuleType, QualType>
ImplicitTypingScope::Resolve(const IdentifierInfo *IdInfo) {
if(None)
return std::make_pair(NoneRule, QualType());
char C = toupper(IdInfo->getNameStart()[0]);
auto Result = Rules.find(llvm::StringRef(&C, 1));
if(Result != Rules.end())
return std::make_pair(TypeRule, Result->getValue());
else if(Parent)
return Parent->Resolve(IdInfo);
else return std::make_pair(DefaultRule, QualType());
}
InnerScope::InnerScope(InnerScope *Prev)
: Parent(Prev) {
}
void InnerScope::Declare(const IdentifierInfo *IDInfo, Decl *Declaration) {
Declarations[IDInfo->getName()] = Declaration;
}
Decl *InnerScope::Lookup(const IdentifierInfo *IDInfo) const {
auto Result = Declarations.find(IDInfo->getName());
if(Result != Declarations.end())
return Result->getValue();
return nullptr;
}
Decl *InnerScope::Resolve(const IdentifierInfo *IDInfo) const {
auto Result = Lookup(IDInfo);
return Result? Result : (Parent? Parent->Resolve(IDInfo) : nullptr);
}
CommonBlockScope::CommonBlockScope()
: UnnamedBlock(nullptr) {}
CommonBlockDecl *CommonBlockScope::find(const IdentifierInfo *IDInfo) {
assert(IDInfo);
auto Result = Blocks.find(IDInfo);
if(Result != Blocks.end())
return Result->second;
return nullptr;
}
CommonBlockDecl *CommonBlockScope::findOrInsert(ASTContext &C, DeclContext *DC,
SourceLocation IDLoc,
const IdentifierInfo *IDInfo) {
if(!IDInfo) {
if(!UnnamedBlock) {
UnnamedBlock = CommonBlockDecl::Create(C, DC, IDLoc, IDInfo);
auto Set = CommonBlockSet::Create(C, UnnamedBlock);
UnnamedBlock->setStorageSet(Set);
}
return UnnamedBlock;
}
auto Result = Blocks.find(IDInfo);
if(Result != Blocks.end())
return Result->second;
auto Block = CommonBlockDecl::Create(C, DC, IDLoc, IDInfo);
auto Set = CommonBlockSet::Create(C, Block);
Block->setStorageSet(Set);
Blocks.insert(std::make_pair(IDInfo, Block));
return Block;
}
} // end namespace flang
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