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The compiler is generally free to not include pointers to metadata in heap boxes, which are used for closure captures, if it knows you can get to metadata through some other path. These MetadataSource classes will describe a sequence of steps to get to metadata at runtime. In the short term, this will be useful for describing the layout of function/closure capture contexts, which can vary depending on what is captured.
90 lines
2.1 KiB
C++
90 lines
2.1 KiB
C++
//===--- MetadataSource.cpp - Swift Metadata Sources for Reflection -------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Reflection/MetadataSource.h"
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using namespace swift;
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using namespace reflection;
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class PrintMetadataSource
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: public MetadataSourceVisitor<PrintMetadataSource, void> {
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std::ostream &OS;
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unsigned Indent;
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std::ostream &indent(unsigned Amount) {
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for (unsigned i = 0; i < Amount; ++i)
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OS << ' ';
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return OS;
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}
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std::ostream &printHeader(std::string Name) {
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indent(Indent) << '(' << Name;
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return OS;
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}
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template<typename T>
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std::ostream &printField(std::string name, const T &value) {
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if (!name.empty())
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OS << " " << name << "=" << value;
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else
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OS << " " << value;
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return OS;
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}
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void printRec(const MetadataSource *MS) {
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OS << "\n";
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Indent += 2;
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visit(MS);
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Indent -= 2;
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}
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void closeForm() {
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OS << ')';
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}
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public:
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PrintMetadataSource(std::ostream &OS, unsigned Indent)
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: OS(OS), Indent(Indent) {}
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void
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visitClosureBindingMetadataSource(const ClosureBindingMetadataSource *CB) {
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printHeader("closure-binding");
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printField("index", CB->getIndex());
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closeForm();
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}
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void
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visitReferenceCaptureMetadataSource(const ReferenceCaptureMetadataSource *RC){
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printHeader("reference-capture");
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printField("index", RC->getIndex());
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closeForm();
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}
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void
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visitGenericArgumentMetadataSource(const GenericArgumentMetadataSource *GA) {
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printHeader("generic-argument");
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printField("index", GA->getIndex());
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printRec(GA->getSource());
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closeForm();
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}
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};
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void MetadataSource::dump() const {
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dump(std::cerr, 0);
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}
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void MetadataSource::dump(std::ostream &OS, unsigned Indent) const {
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PrintMetadataSource(OS, Indent).visit(this);
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}
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