1 files changed, 102 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/sksl/ir/SkSLSwitchStatement.h b/gfx/skia/skia/src/sksl/ir/SkSLSwitchStatement.h
new file mode 100644
index 0000000000..71b96aa229
--- /dev/null
+++ b/gfx/skia/skia/src/sksl/ir/SkSLSwitchStatement.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SKSL_SWITCHSTATEMENT
+#define SKSL_SWITCHSTATEMENT
+
+#include "include/private/SkSLDefines.h"
+#include "include/private/SkSLIRNode.h"
+#include "include/private/SkSLStatement.h"
+#include "include/sksl/SkSLPosition.h"
+#include "src/sksl/ir/SkSLExpression.h"
+
+#include <memory>
+#include <string>
+#include <utility>
+
+namespace SkSL {
+
+class Context;
+class SwitchCase;
+class SymbolTable;
+
+/**
+ * A 'switch' statement.
+ */
+class SwitchStatement final : public Statement {
+public:
+    inline static constexpr Kind kIRNodeKind = Kind::kSwitch;
+
+    SwitchStatement(Position pos, std::unique_ptr<Expression> value,
+                    StatementArray cases, std::shared_ptr<SymbolTable> symbols)
+        : INHERITED(pos, kIRNodeKind)
+        , fValue(std::move(value))
+        , fCases(std::move(cases))
+        , fSymbols(std::move(symbols)) {}
+
+    // Create a `switch` statement with an array of case-values and case-statements.
+    // Coerces case values to the proper type and reports an error if cases are duplicated.
+    // Reports errors via the ErrorReporter.
+    static std::unique_ptr<Statement> Convert(const Context& context,
+                                              Position pos,
+                                              std::unique_ptr<Expression> value,
+                                              ExpressionArray caseValues,
+                                              StatementArray caseStatements,
+                                              std::shared_ptr<SymbolTable> symbolTable);
+
+    // Create a `switch` statement with an array of SwitchCases. The array of SwitchCases must
+    // already contain non-overlapping, correctly-typed case values. Reports errors via ASSERT.
+    static std::unique_ptr<Statement> Make(const Context& context,
+                                           Position pos,
+                                           std::unique_ptr<Expression> value,
+                                           StatementArray cases,
+                                           std::shared_ptr<SymbolTable> symbolTable);
+
+    // Returns a block containing all of the statements that will be run if the given case matches
+    // (which, owing to the statements being owned by unique_ptrs, means the switch itself will be
+    // disassembled by this call and must then be discarded).
+    // Returns null (and leaves the switch unmodified) if no such simple reduction is possible, such
+    // as when break statements appear inside conditionals.
+    static std::unique_ptr<Statement> BlockForCase(StatementArray* cases,
+                                                   SwitchCase* caseToCapture,
+                                                   std::shared_ptr<SymbolTable> symbolTable);
+
+    std::unique_ptr<Expression>& value() {
+        return fValue;
+    }
+
+    const std::unique_ptr<Expression>& value() const {
+        return fValue;
+    }
+
+    StatementArray& cases() {
+        return fCases;
+    }
+
+    const StatementArray& cases() const {
+        return fCases;
+    }
+
+    const std::shared_ptr<SymbolTable>& symbols() const {
+        return fSymbols;
+    }
+
+    std::unique_ptr<Statement> clone() const override;
+
+    std::string description() const override;
+
+private:
+    std::unique_ptr<Expression> fValue;
+    StatementArray fCases;  // every Statement inside fCases must be a SwitchCase
+    std::shared_ptr<SymbolTable> fSymbols;
+
+    using INHERITED = Statement;
+};
+
+}  // namespace SkSL
+
+#endif