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//===--- CaptureInfo.cpp - Data Structure for Capture Lists ---------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/AST/CaptureInfo.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/Decl.h"
#include "swift/AST/Expr.h"
#include "swift/AST/GenericEnvironment.h"
#include "llvm/Support/raw_ostream.h"
using namespace swift;
CapturedValue::CapturedValue(Expr *Val, unsigned Flags)
: Value(Val, Flags), Loc(SourceLoc()) {
assert(isa<OpaqueValueExpr>(Val) || isa<PackElementExpr>(Val));
}
bool CapturedValue::isPackElement() const {
return isExpr() && isa<PackElementExpr>(getExpr());
}
bool CapturedValue::isOpaqueValue() const {
return isExpr() && isa<OpaqueValueExpr>(getExpr());
}
OpaqueValueExpr *CapturedValue::getOpaqueValue() const {
return dyn_cast_or_null<OpaqueValueExpr>(getExpr());
}
PackElementExpr *CapturedValue::getPackElement() const {
return dyn_cast_or_null<PackElementExpr>(getExpr());
}
Type CapturedValue::getPackElementType() const {
return getPackElement()->getType();
}
ArrayRef<CapturedValue>
CaptureInfo::CaptureInfoStorage::getCaptures() const {
return llvm::ArrayRef(this->getTrailingObjects<CapturedValue>(), NumCapturedValues);
}
ArrayRef<GenericEnvironment *>
CaptureInfo::CaptureInfoStorage::getGenericEnvironments() const {
return llvm::ArrayRef(this->getTrailingObjects<GenericEnvironment *>(), NumGenericEnvironments);
}
//===----------------------------------------------------------------------===//
// MARK: CaptureInfo
//===----------------------------------------------------------------------===//
CaptureInfo::CaptureInfo(ASTContext &ctx, ArrayRef<CapturedValue> captures,
DynamicSelfType *dynamicSelf,
OpaqueValueExpr *opaqueValue,
bool genericParamCaptures,
ArrayRef<GenericEnvironment *> genericEnv) {
static_assert(IsTriviallyDestructible<CapturedValue>::value,
"Capture info is alloc'd on the ASTContext and not destroyed");
static_assert(IsTriviallyDestructible<CaptureInfo::CaptureInfoStorage>::value,
"Capture info is alloc'd on the ASTContext and not destroyed");
// This is the only kind of local generic environment we can capture right now.
#ifndef NDEBUG
for (auto *env : genericEnv) {
assert(env->getKind() == GenericEnvironment::Kind::OpenedElement);
}
#endif
OptionSet<Flags> flags;
if (genericParamCaptures)
flags |= Flags::HasGenericParamCaptures;
if (captures.empty() && genericEnv.empty() && !dynamicSelf && !opaqueValue) {
*this = CaptureInfo::empty();
StorageAndFlags.setInt(flags);
return;
}
size_t storageToAlloc =
CaptureInfoStorage::totalSizeToAlloc<CapturedValue,
GenericEnvironment *>(captures.size(),
genericEnv.size());
void *storageBuf = ctx.Allocate(storageToAlloc, alignof(CaptureInfoStorage));
auto *storage = new (storageBuf) CaptureInfoStorage(dynamicSelf,
opaqueValue,
captures.size(),
genericEnv.size());
StorageAndFlags.setPointerAndInt(storage, flags);
std::uninitialized_copy(captures.begin(), captures.end(),
storage->getTrailingObjects<CapturedValue>());
std::uninitialized_copy(genericEnv.begin(), genericEnv.end(),
storage->getTrailingObjects<GenericEnvironment *>());
}
CaptureInfo CaptureInfo::empty() {
static const CaptureInfoStorage empty{/*dynamicSelf*/nullptr,
/*opaqueValue*/nullptr,
0, 0};
CaptureInfo result;
result.StorageAndFlags.setPointer(&empty);
return result;
}
bool CaptureInfo::hasLocalCaptures() const {
for (auto capture : getCaptures()) {
if (capture.isLocalCapture())
return true;
}
return false;
}
void CaptureInfo::
getLocalCaptures(SmallVectorImpl<CapturedValue> &Result) const {
if (!hasLocalCaptures()) return;
Result.reserve(getCaptures().size());
// Filter out global variables.
for (auto capture : getCaptures()) {
if (!capture.isLocalCapture())
continue;
Result.push_back(capture);
}
}
VarDecl *CaptureInfo::getIsolatedParamCapture() const {
if (!hasLocalCaptures())
return nullptr;
for (const auto &capture : getCaptures()) {
// NOTE: isLocalCapture() returns false if we have dynamic self metadata
// since dynamic self metadata is never an isolated capture. So we can just
// call isLocalCapture without checking for dynamic self metadata.
if (!capture.isLocalCapture())
continue;
// If we captured an isolated parameter, return it.
if (auto param = dyn_cast_or_null<ParamDecl>(capture.getDecl())) {
// If we have captured an isolated parameter, return it.
if (param->isIsolated())
return param;
}
// If we captured 'self', check whether it is (still) isolated.
if (auto var = dyn_cast_or_null<VarDecl>(capture.getDecl())) {
if (var->isSelfParamCapture() && var->isSelfParamCaptureIsolated())
return var;
}
}
return nullptr;
}
LLVM_ATTRIBUTE_USED void CaptureInfo::dump() const {
print(llvm::errs());
llvm::errs() << '\n';
}
void CaptureInfo::print(raw_ostream &OS) const {
OS << "captures=(";
if (hasGenericParamCaptures())
OS << "<generic> ";
if (hasDynamicSelfCapture())
OS << "<dynamic_self> ";
if (hasOpaqueValueCapture())
OS << "<opaque_value> ";
interleave(getCaptures(),
[&](const CapturedValue &capture) {
if (capture.getDecl())
OS << capture.getDecl()->getBaseName();
else if (capture.isPackElement()) {
OS << "[pack element] ";
capture.getPackElement()->dump(OS);
} else if (capture.isOpaqueValue()) {
OS << "[opaque] ";
capture.getOpaqueValue()->dump(OS);
} else {
OS << "[unknown] ";
assert(false);
}
if (capture.isDirect())
OS << "<direct>";
if (capture.isNoEscape())
OS << "<noescape>";
},
[&] { OS << ", "; });
interleave(getGenericEnvironments(),
[&](GenericEnvironment *genericEnv) {
OS << " shape_class=";
OS << genericEnv->getOpenedElementShapeClass();
},
[&] { OS << ","; });
OS << ')';
}
//===----------------------------------------------------------------------===//
// MARK: CapturedValue
//===----------------------------------------------------------------------===//
bool CapturedValue::isLocalCapture() const {
auto *decl = Value.getPointer().dyn_cast<ValueDecl *>();
return decl && decl->isLocalCapture();
}
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