1 files changed, 77 insertions, 0 deletions
diff --git a/js/src/wasm/WasmTextUtils.cpp b/js/src/wasm/WasmTextUtils.cpp
new file mode 100644
index 000000000..22dc3a3d8
--- /dev/null
+++ b/js/src/wasm/WasmTextUtils.cpp
@@ -0,0 +1,77 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ *
+ * Copyright 2016 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.
+ */
+
+#include "wasm/WasmTextUtils.h"
+
+#include "vm/StringBuffer.h"
+#include "wasm/WasmTypes.h"
+
+using namespace js;
+using namespace js::jit;
+
+using mozilla::IsNaN;
+
+template<size_t base>
+bool
+js::wasm::RenderInBase(StringBuffer& sb, uint64_t num)
+{
+    uint64_t n = num;
+    uint64_t pow = 1;
+    while (n) {
+        pow *= base;
+        n /= base;
+    }
+    pow /= base;
+
+    n = num;
+    while (pow) {
+        if (!sb.append("0123456789abcdef"[n / pow]))
+            return false;
+        n -= (n / pow) * pow;
+        pow /= base;
+    }
+
+    return true;
+}
+
+template bool js::wasm::RenderInBase<10>(StringBuffer& sb, uint64_t num);
+
+template<class T>
+bool
+js::wasm::RenderNaN(StringBuffer& sb, Raw<T> num)
+{
+    typedef typename mozilla::SelectTrait<T> Traits;
+
+    MOZ_ASSERT(IsNaN(num.fp()));
+
+    if ((num.bits() & Traits::kSignBit) && !sb.append("-"))
+        return false;
+    if (!sb.append("nan"))
+        return false;
+
+    typename Traits::Bits payload = num.bits() & Traits::kSignificandBits;
+    // Only render the payload if it's not the spec's default NaN.
+    if (payload == ((Traits::kSignificandBits + 1) >> 1))
+        return true;
+
+    return sb.append(":0x") &&
+           RenderInBase<16>(sb, payload);
+}
+
+template MOZ_MUST_USE bool js::wasm::RenderNaN(StringBuffer& b, Raw<float> num);
+template MOZ_MUST_USE bool js::wasm::RenderNaN(StringBuffer& b, Raw<double> num);