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diff --git a/js/src/wasm/WasmBuiltins.h b/js/src/wasm/WasmBuiltins.h
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+++ b/js/src/wasm/WasmBuiltins.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ *
+ * Copyright 2017 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef wasm_builtins_h
+#define wasm_builtins_h
+
+#include "wasm/WasmTypes.h"
+
+namespace js {
+namespace wasm {
+
+class WasmFrameIter;
+
+// These provide argument type information for a subset of the SymbolicAddress
+// targets, for which type info is needed to generate correct stackmaps.
+
+extern const SymbolicAddressSignature SASigSinD;
+extern const SymbolicAddressSignature SASigCosD;
+extern const SymbolicAddressSignature SASigTanD;
+extern const SymbolicAddressSignature SASigASinD;
+extern const SymbolicAddressSignature SASigACosD;
+extern const SymbolicAddressSignature SASigATanD;
+extern const SymbolicAddressSignature SASigCeilD;
+extern const SymbolicAddressSignature SASigCeilF;
+extern const SymbolicAddressSignature SASigFloorD;
+extern const SymbolicAddressSignature SASigFloorF;
+extern const SymbolicAddressSignature SASigTruncD;
+extern const SymbolicAddressSignature SASigTruncF;
+extern const SymbolicAddressSignature SASigNearbyIntD;
+extern const SymbolicAddressSignature SASigNearbyIntF;
+extern const SymbolicAddressSignature SASigExpD;
+extern const SymbolicAddressSignature SASigLogD;
+extern const SymbolicAddressSignature SASigPowD;
+extern const SymbolicAddressSignature SASigATan2D;
+extern const SymbolicAddressSignature SASigMemoryGrow;
+extern const SymbolicAddressSignature SASigMemorySize;
+extern const SymbolicAddressSignature SASigWaitI32;
+extern const SymbolicAddressSignature SASigWaitI64;
+extern const SymbolicAddressSignature SASigWake;
+extern const SymbolicAddressSignature SASigMemCopy;
+extern const SymbolicAddressSignature SASigMemCopyShared;
+extern const SymbolicAddressSignature SASigDataDrop;
+extern const SymbolicAddressSignature SASigMemFill;
+extern const SymbolicAddressSignature SASigMemFillShared;
+extern const SymbolicAddressSignature SASigMemInit;
+extern const SymbolicAddressSignature SASigTableCopy;
+extern const SymbolicAddressSignature SASigElemDrop;
+extern const SymbolicAddressSignature SASigTableFill;
+extern const SymbolicAddressSignature SASigTableGet;
+extern const SymbolicAddressSignature SASigTableGrow;
+extern const SymbolicAddressSignature SASigTableInit;
+extern const SymbolicAddressSignature SASigTableSet;
+extern const SymbolicAddressSignature SASigTableSize;
+extern const SymbolicAddressSignature SASigRefFunc;
+extern const SymbolicAddressSignature SASigPreBarrierFiltering;
+extern const SymbolicAddressSignature SASigPostBarrier;
+extern const SymbolicAddressSignature SASigPostBarrierFiltering;
+extern const SymbolicAddressSignature SASigStructNew;
+extern const SymbolicAddressSignature SASigStructNarrow;
+
+// A SymbolicAddress that NeedsBuiltinThunk() will call through a thunk to the
+// C++ function. This will be true for all normal calls from normal wasm
+// function code. Only calls to C++ from other exits/thunks do not need a thunk.
+
+bool NeedsBuiltinThunk(SymbolicAddress sym);
+
+// This function queries whether pc is in one of the process's builtin thunks
+// and, if so, returns the CodeRange and pointer to the code segment that the
+// CodeRange is relative to.
+
+bool LookupBuiltinThunk(void* pc, const CodeRange** codeRange,
+                        uint8_t** codeBase);
+
+// EnsureBuiltinThunksInitialized() must be called, and must succeed, before
+// SymbolicAddressTarget() or MaybeGetBuiltinThunk(). This function creates all
+// thunks for the process. ReleaseBuiltinThunks() should be called before
+// ReleaseProcessExecutableMemory() so that the latter can assert that all
+// executable code has been released.
+
+bool EnsureBuiltinThunksInitialized();
+
+void* HandleThrow(JSContext* cx, WasmFrameIter& iter);
+
+void* SymbolicAddressTarget(SymbolicAddress sym);
+
+void* ProvisionalJitEntryStub();
+
+void* MaybeGetBuiltinThunk(JSFunction* f, const FuncType& funcType);
+
+void ReleaseBuiltinThunks();
+
+void* AddressOf(SymbolicAddress imm, jit::ABIFunctionType* abiType);
+
+#ifdef WASM_CODEGEN_DEBUG
+void PrintI32(int32_t val);
+void PrintF32(float val);
+void PrintF64(double val);
+void PrintPtr(uint8_t* val);
+void PrintText(const char* out);
+#endif
+
+}  // namespace wasm
+}  // namespace js
+
+#endif  // wasm_builtins_h