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/* -*- 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 "util/StringBuffer.h"
#include "wasm/WasmTypes.h"
using namespace js;
using namespace jit;
using namespace wasm;
using mozilla::IsNaN;
template<size_t base>
bool
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 wasm::RenderInBase<10>(StringBuffer& sb, uint64_t num);
template<class T>
bool
wasm::RenderNaN(StringBuffer& sb, T num)
{
typedef typename mozilla::SelectTrait<T> Traits;
typedef typename Traits::Bits Bits;
MOZ_ASSERT(IsNaN(num));
Bits bits = mozilla::BitwiseCast<Bits>(num);
if ((bits & Traits::kSignBit) && !sb.append("-"))
return false;
if (!sb.append("nan"))
return false;
Bits payload = 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 wasm::RenderNaN(StringBuffer& b, float num);
template MOZ_MUST_USE bool wasm::RenderNaN(StringBuffer& b, double num);
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