initial checkin of SkSL compiler

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1984363002
CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot

Review-Url: https://codereview.chromium.org/1984363002

1 files changed, 55 insertions, 0 deletions

diff --git a/src/sksl/ir/SkSLExpression.h b/src/sksl/ir/SkSLExpression.h
new file mode 100644
index 0000000000..1e42c7a475
--- /dev/null
+++ b/src/sksl/ir/SkSLExpression.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+ 
+#ifndef SKSL_EXPRESSION
+#define SKSL_EXPRESSION
+
+#include "SkSLIRNode.h"
+#include "SkSLType.h"
+
+namespace SkSL {
+
+/**
+ * Abstract supertype of all expressions. 
+ */
+struct Expression : public IRNode {
+    enum Kind {
+        kBinary_Kind,
+        kBoolLiteral_Kind,
+        kConstructor_Kind,
+        kIntLiteral_Kind,
+        kFieldAccess_Kind,
+        kFloatLiteral_Kind,
+        kFunctionReference_Kind,
+        kFunctionCall_Kind,
+        kIndex_Kind,
+        kPrefix_Kind,
+        kPostfix_Kind,
+        kSwizzle_Kind,
+        kVariableReference_Kind,
+        kTernary_Kind,
+        kTypeReference_Kind,
+    };
+
+    Expression(Position position, Kind kind, std::shared_ptr<Type> type)
+    : INHERITED(position)
+    , fKind(kind)
+    , fType(std::move(type)) {}
+
+    virtual bool isConstant() const {
+        return false;
+    }
+
+    const Kind fKind;
+    const std::shared_ptr<Type> fType;
+
+    typedef IRNode INHERITED;
+};
+
+} // namespace
+
+#endif