438863a09e
The 'cache' construct is lowered as marking the acc.loop in ACC MLIR. This results in any variable references that are not inside of the acc.loop being invalid. This patch adds a warning to that effect, and ensures that the variable references won't be added to the AST during parsing so we don't try to lower them. This results in loss of instantiation-diagnostics for these, however that seems like an acceptable consequence to ignoring it.
270 lines
8.7 KiB
C++
270 lines
8.7 KiB
C++
//===- Scope.cpp - Lexical scope information --------------------*- C++ -*-===//
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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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//
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// This file implements the Scope class, which is used for recording
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// information about a lexical scope.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Sema/Scope.h"
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#include "clang/AST/Decl.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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void Scope::setFlags(Scope *parent, unsigned flags) {
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AnyParent = parent;
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Flags = flags;
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if (parent && !(flags & FnScope)) {
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BreakParent = parent->BreakParent;
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ContinueParent = parent->ContinueParent;
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} else {
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// Control scopes do not contain the contents of nested function scopes for
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// control flow purposes.
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BreakParent = ContinueParent = nullptr;
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}
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if (parent) {
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Depth = parent->Depth + 1;
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PrototypeDepth = parent->PrototypeDepth;
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PrototypeIndex = 0;
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FnParent = parent->FnParent;
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BlockParent = parent->BlockParent;
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TemplateParamParent = parent->TemplateParamParent;
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DeclParent = parent->DeclParent;
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MSLastManglingParent = parent->MSLastManglingParent;
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MSCurManglingNumber = getMSLastManglingNumber();
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if ((Flags & (FnScope | ClassScope | BlockScope | TemplateParamScope |
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FunctionPrototypeScope | AtCatchScope | ObjCMethodScope)) ==
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0)
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Flags |= parent->getFlags() & OpenMPSimdDirectiveScope;
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// transmit the parent's 'order' flag, if exists
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if (parent->getFlags() & OpenMPOrderClauseScope)
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Flags |= OpenMPOrderClauseScope;
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} else {
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Depth = 0;
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PrototypeDepth = 0;
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PrototypeIndex = 0;
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MSLastManglingParent = FnParent = BlockParent = nullptr;
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TemplateParamParent = nullptr;
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DeclParent = nullptr;
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MSLastManglingNumber = 1;
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MSCurManglingNumber = 1;
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}
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// If this scope is a function or contains breaks/continues, remember it.
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if (flags & FnScope) FnParent = this;
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// The MS mangler uses the number of scopes that can hold declarations as
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// part of an external name.
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if (Flags & (ClassScope | FnScope)) {
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MSLastManglingNumber = getMSLastManglingNumber();
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MSLastManglingParent = this;
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MSCurManglingNumber = 1;
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}
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if (flags & BreakScope) BreakParent = this;
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if (flags & ContinueScope) ContinueParent = this;
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if (flags & BlockScope) BlockParent = this;
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if (flags & TemplateParamScope) TemplateParamParent = this;
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// If this is a prototype scope, record that. Lambdas have an extra prototype
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// scope that doesn't add any depth.
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if (flags & FunctionPrototypeScope && !(flags & LambdaScope))
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PrototypeDepth++;
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if (flags & DeclScope) {
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DeclParent = this;
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if (flags & FunctionPrototypeScope)
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; // Prototype scopes are uninteresting.
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else if ((flags & ClassScope) && getParent()->isClassScope())
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; // Nested class scopes aren't ambiguous.
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else if ((flags & ClassScope) && getParent()->getFlags() == DeclScope)
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; // Classes inside of namespaces aren't ambiguous.
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else if ((flags & EnumScope))
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; // Don't increment for enum scopes.
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else
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incrementMSManglingNumber();
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}
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}
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void Scope::Init(Scope *parent, unsigned flags) {
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setFlags(parent, flags);
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DeclsInScope.clear();
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UsingDirectives.clear();
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Entity = nullptr;
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ErrorTrap.reset();
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NRVO = std::nullopt;
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}
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bool Scope::containedInPrototypeScope() const {
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const Scope *S = this;
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while (S) {
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if (S->isFunctionPrototypeScope())
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return true;
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S = S->getParent();
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}
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return false;
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}
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void Scope::AddFlags(unsigned FlagsToSet) {
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assert((FlagsToSet & ~(BreakScope | ContinueScope)) == 0 &&
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"Unsupported scope flags");
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if (FlagsToSet & BreakScope) {
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assert((Flags & BreakScope) == 0 && "Already set");
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BreakParent = this;
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}
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if (FlagsToSet & ContinueScope) {
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assert((Flags & ContinueScope) == 0 && "Already set");
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ContinueParent = this;
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}
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Flags |= FlagsToSet;
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}
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// The algorithm for updating NRVO candidate is as follows:
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// 1. All previous candidates become invalid because a new NRVO candidate is
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// obtained. Therefore, we need to clear return slots for other
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// variables defined before the current return statement in the current
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// scope and in outer scopes.
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// 2. Store the new candidate if its return slot is available. Otherwise,
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// there is no NRVO candidate so far.
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void Scope::updateNRVOCandidate(VarDecl *VD) {
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auto UpdateReturnSlotsInScopeForVD = [VD](Scope *S) -> bool {
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bool IsReturnSlotFound = S->ReturnSlots.contains(VD);
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// We found a candidate variable that can be put into a return slot.
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// Clear the set, because other variables cannot occupy a return
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// slot in the same scope.
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S->ReturnSlots.clear();
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if (IsReturnSlotFound)
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S->ReturnSlots.insert(VD);
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return IsReturnSlotFound;
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};
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bool CanBePutInReturnSlot = false;
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for (auto *S = this; S; S = S->getParent()) {
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CanBePutInReturnSlot |= UpdateReturnSlotsInScopeForVD(S);
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if (S->getEntity())
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break;
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}
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// Consider the variable as NRVO candidate if the return slot is available
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// for it in the current scope, or if it can be available in outer scopes.
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NRVO = CanBePutInReturnSlot ? VD : nullptr;
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}
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void Scope::applyNRVO() {
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// There is no NRVO candidate in the current scope.
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if (!NRVO.has_value())
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return;
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if (*NRVO && isDeclScope(*NRVO))
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(*NRVO)->setNRVOVariable(true);
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// It's necessary to propagate NRVO candidate to the parent scope for cases
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// when the parent scope doesn't contain a return statement.
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// For example:
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// X foo(bool b) {
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// X x;
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// if (b)
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// return x;
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// exit(0);
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// }
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// Also, we need to propagate nullptr value that means NRVO is not
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// allowed in this scope.
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// For example:
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// X foo(bool b) {
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// X x;
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// if (b)
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// return x;
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// else
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// return X(); // NRVO is not allowed
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// }
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if (!getEntity())
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getParent()->NRVO = *NRVO;
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}
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LLVM_DUMP_METHOD void Scope::dump() const { dumpImpl(llvm::errs()); }
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void Scope::dumpImpl(raw_ostream &OS) const {
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unsigned Flags = getFlags();
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bool HasFlags = Flags != 0;
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if (HasFlags)
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OS << "Flags: ";
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std::pair<unsigned, const char *> FlagInfo[] = {
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{FnScope, "FnScope"},
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{BreakScope, "BreakScope"},
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{ContinueScope, "ContinueScope"},
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{DeclScope, "DeclScope"},
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{ControlScope, "ControlScope"},
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{ClassScope, "ClassScope"},
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{BlockScope, "BlockScope"},
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{TemplateParamScope, "TemplateParamScope"},
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{FunctionPrototypeScope, "FunctionPrototypeScope"},
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{FunctionDeclarationScope, "FunctionDeclarationScope"},
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{AtCatchScope, "AtCatchScope"},
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{ObjCMethodScope, "ObjCMethodScope"},
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{SwitchScope, "SwitchScope"},
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{TryScope, "TryScope"},
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{FnTryCatchScope, "FnTryCatchScope"},
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{OpenMPDirectiveScope, "OpenMPDirectiveScope"},
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{OpenMPLoopDirectiveScope, "OpenMPLoopDirectiveScope"},
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{OpenMPSimdDirectiveScope, "OpenMPSimdDirectiveScope"},
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{EnumScope, "EnumScope"},
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{SEHTryScope, "SEHTryScope"},
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{SEHExceptScope, "SEHExceptScope"},
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{SEHFilterScope, "SEHFilterScope"},
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{CompoundStmtScope, "CompoundStmtScope"},
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{ClassInheritanceScope, "ClassInheritanceScope"},
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{CatchScope, "CatchScope"},
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{ConditionVarScope, "ConditionVarScope"},
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{OpenMPOrderClauseScope, "OpenMPOrderClauseScope"},
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{LambdaScope, "LambdaScope"},
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{OpenACCComputeConstructScope, "OpenACCComputeConstructScope"},
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{TypeAliasScope, "TypeAliasScope"},
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{FriendScope, "FriendScope"},
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{OpenACCComputeConstructScope, "OpenACCComputeConstructScope"},
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{OpenACCLoopConstructScope, "OpenACCLoopConstructScope"}};
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for (auto Info : FlagInfo) {
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if (Flags & Info.first) {
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OS << Info.second;
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Flags &= ~Info.first;
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if (Flags)
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OS << " | ";
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}
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}
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assert(Flags == 0 && "Unknown scope flags");
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if (HasFlags)
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OS << '\n';
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if (const Scope *Parent = getParent())
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OS << "Parent: (clang::Scope*)" << Parent << '\n';
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OS << "Depth: " << Depth << '\n';
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OS << "MSLastManglingNumber: " << getMSLastManglingNumber() << '\n';
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OS << "MSCurManglingNumber: " << getMSCurManglingNumber() << '\n';
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if (const DeclContext *DC = getEntity())
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OS << "Entity : (clang::DeclContext*)" << DC << '\n';
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if (!NRVO)
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OS << "there is no NRVO candidate\n";
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else if (*NRVO)
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OS << "NRVO candidate : (clang::VarDecl*)" << *NRVO << '\n';
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else
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OS << "NRVO is not allowed\n";
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}
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