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//===--- ArgumentScope.h ----------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_SILGEN_ARGUMENTSCOPE_H
#define SWIFT_SILGEN_ARGUMENTSCOPE_H
#include "FormalEvaluation.h"
#include "SILGenFunction.h"
#include "Scope.h"
namespace swift {
namespace Lowering {
/// A scope that is created before arguments are emitted for an apply and is
/// popped manually immediately after the raw apply is emitted and before the
/// raw results are marshalled into managed resources.
///
/// Internally this creates a Scope and a FormalEvaluationScope. It ensures that
/// they are destroyed/initialized in the appropriate order.
class ArgumentScope {
Scope normalScope;
FormalEvaluationScope formalEvalScope;
SILLocation loc;
public:
ArgumentScope(SILGenFunction &SGF, SILLocation loc)
: normalScope(SGF.Cleanups, CleanupLocation(loc)),
formalEvalScope(SGF), loc(loc) {}
~ArgumentScope() {
if (normalScope.isValid() || !formalEvalScope.isPopped()) {
llvm_unreachable("ArgumentScope that wasn't popped?!");
}
}
ArgumentScope() = delete;
ArgumentScope(const ArgumentScope &) = delete;
ArgumentScope &operator=(const ArgumentScope &) = delete;
ArgumentScope(ArgumentScope &&other) = delete;
ArgumentScope &operator=(ArgumentScope &&other) = delete;
void pop() { popImpl(); }
/// Pop the formal evaluation and argument scopes preserving the value mv.
ManagedValue popPreservingValue(ManagedValue mv);
// Pop the formal evaluation and argument scopes, preserving rv.
RValue popPreservingValue(RValue &&rv);
void verify() {
formalEvalScope.verify();
}
bool isValid() const { return normalScope.isValid(); }
private:
void popImpl() {
// We must always pop the formal eval scope before the normal scope since
// the formal eval scope may have pointers into the normal scope.
normalScope.verify();
formalEvalScope.pop();
normalScope.pop();
}
};
} // end namespace Lowering
} // end namespace swift
#endif
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