9a8efd8a4e
Change-Id: I20ed35a7fb5104a9cc66bb54fa8966589c43d7f9 Reviewed-on: https://chromium-review.googlesource.com/507287 Reviewed-by: Andreas Haas <ahaas@chromium.org> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Daniel Clifford <danno@chromium.org> Reviewed-by: Jakob Gruber <jgruber@chromium.org> Reviewed-by: Marja Hölttä <marja@chromium.org> Reviewed-by: Jochen Eisinger <jochen@chromium.org> Commit-Queue: Wiktor Garbacz <wiktorg@google.com> Cr-Commit-Position: refs/heads/master@{#45458}
83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
// Copyright 2011 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <cmath>
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#include "src/base/logging.h"
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#include "src/utils.h"
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#include "src/dtoa.h"
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#include "src/bignum-dtoa.h"
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#include "src/double.h"
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#include "src/fast-dtoa.h"
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#include "src/fixed-dtoa.h"
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namespace v8 {
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namespace internal {
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static BignumDtoaMode DtoaToBignumDtoaMode(DtoaMode dtoa_mode) {
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switch (dtoa_mode) {
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case DTOA_SHORTEST: return BIGNUM_DTOA_SHORTEST;
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case DTOA_FIXED: return BIGNUM_DTOA_FIXED;
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case DTOA_PRECISION: return BIGNUM_DTOA_PRECISION;
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default:
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UNREACHABLE();
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}
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}
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void DoubleToAscii(double v, DtoaMode mode, int requested_digits,
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Vector<char> buffer, int* sign, int* length, int* point) {
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DCHECK(!Double(v).IsSpecial());
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DCHECK(mode == DTOA_SHORTEST || requested_digits >= 0);
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if (Double(v).Sign() < 0) {
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*sign = 1;
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v = -v;
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} else {
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*sign = 0;
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}
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if (v == 0) {
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buffer[0] = '0';
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buffer[1] = '\0';
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*length = 1;
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*point = 1;
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return;
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}
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if (mode == DTOA_PRECISION && requested_digits == 0) {
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buffer[0] = '\0';
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*length = 0;
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return;
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}
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bool fast_worked;
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switch (mode) {
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case DTOA_SHORTEST:
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fast_worked = FastDtoa(v, FAST_DTOA_SHORTEST, 0, buffer, length, point);
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break;
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case DTOA_FIXED:
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fast_worked = FastFixedDtoa(v, requested_digits, buffer, length, point);
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break;
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case DTOA_PRECISION:
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fast_worked = FastDtoa(v, FAST_DTOA_PRECISION, requested_digits,
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buffer, length, point);
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break;
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default:
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UNREACHABLE();
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fast_worked = false;
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}
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if (fast_worked) return;
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// If the fast dtoa didn't succeed use the slower bignum version.
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BignumDtoaMode bignum_mode = DtoaToBignumDtoaMode(mode);
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BignumDtoa(v, bignum_mode, requested_digits, buffer, length, point);
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buffer[*length] = '\0';
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}
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} // namespace internal
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} // namespace v8
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