Initial Subzero WASM prototype.

src/WasmTranslator.h

+//===- subzero/src/WasmTranslator.h - WASM to Subzero Translation ---------===//
+//
+//                        The Subzero Code Generator
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief Defines a driver for translating Wasm bitcode into PNaCl bitcode.
+///
+/// The translator uses V8's WebAssembly decoder to handle the binary Wasm
+/// format but replaces the usual TurboFan builder with a new PNaCl builder.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef SUBZERO_SRC_WASMTRANSLATOR_H
+#define SUBZERO_SRC_WASMTRANSLATOR_H
+
+#include "IceGlobalContext.h"
+#include "IceTranslator.h"
+
+namespace v8 {
+namespace internal {
+class Zone;
+namespace wasm {
+class FunctionEnv;
+} // end of namespace wasm
+} // end of namespace internal
+} // end of namespace v8
+
+namespace Ice {
+
+class WasmTranslator : public Translator {
+  WasmTranslator() = delete;
+  WasmTranslator(const WasmTranslator &) = delete;
+  WasmTranslator &operator=(const WasmTranslator &) = delete;
+
+  template <typename F = std::function<void(Ostream &)>> void log(F Fn) {
+    if (BuildDefs::dump() && (Ctx->getFlags().getVerbose() & IceV_Wasm)) {
+      Fn(Ctx->getStrDump());
+      Ctx->getStrDump().flush();
+    }
+  }
+
+public:
+  explicit WasmTranslator(GlobalContext *Ctx);
+
+  void translate(const std::string &IRFilename,
+                 std::unique_ptr<llvm::DataStreamer> InputStream);
+
+  /// Translates a single Wasm function.
+  ///
+  /// Parameters:
+  ///   Zone - an arena for the V8 code to allocate from.
+  ///   Env - information about the function (signature, variable count, etc.).
+  ///   Base - a pointer to the start of the Wasm module.
+  ///   Start - a pointer to the start of the function within the module.
+  ///   End - a pointer to the end of the function.
+  std::unique_ptr<Cfg> translateFunction(v8::internal::Zone *Zone,
+                                         v8::internal::wasm::FunctionEnv *Env,
+                                         const uint8_t *Base,
+                                         const uint8_t *Start,
+                                         const uint8_t *End);
+
+private:
+  std::unique_ptr<uint8_t[]> Buffer;
+  SizeT BufferSize;
+};
+}
+#endif // SUBZERO_SRC_WASMTRANSLATOR_H