77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* Copyright 2016 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "wasm/WasmTextUtils.h"
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#include "vm/StringBuffer.h"
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#include "wasm/WasmTypes.h"
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using namespace js;
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using namespace js::jit;
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using mozilla::IsNaN;
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template<size_t base>
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bool
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js::wasm::RenderInBase(StringBuffer& sb, uint64_t num)
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{
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uint64_t n = num;
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uint64_t pow = 1;
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while (n) {
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pow *= base;
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n /= base;
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}
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pow /= base;
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n = num;
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while (pow) {
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if (!sb.append("0123456789abcdef"[n / pow]))
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return false;
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n -= (n / pow) * pow;
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pow /= base;
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}
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return true;
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}
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template bool js::wasm::RenderInBase<10>(StringBuffer& sb, uint64_t num);
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template<class T>
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bool
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js::wasm::RenderNaN(StringBuffer& sb, Raw<T> num)
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{
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typedef typename mozilla::SelectTrait<T> Traits;
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MOZ_ASSERT(IsNaN(num.fp()));
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if ((num.bits() & Traits::kSignBit) && !sb.append("-"))
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return false;
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if (!sb.append("nan"))
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return false;
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typename Traits::Bits payload = num.bits() & Traits::kSignificandBits;
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// Only render the payload if it's not the spec's default NaN.
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if (payload == ((Traits::kSignificandBits + 1) >> 1))
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return true;
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return sb.append(":0x") &&
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RenderInBase<16>(sb, payload);
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}
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template MOZ_MUST_USE bool js::wasm::RenderNaN(StringBuffer& b, Raw<float> num);
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template MOZ_MUST_USE bool js::wasm::RenderNaN(StringBuffer& b, Raw<double> num);
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