264 lines
7.5 KiB
C++
264 lines
7.5 KiB
C++
//===- NativeFormatting.cpp - Low level formatting helpers -------*- C++-*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/NativeFormatting.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/Format.h"
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#include <float.h>
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using namespace llvm;
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template<typename T, std::size_t N>
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static int format_to_buffer(T Value, char (&Buffer)[N]) {
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char *EndPtr = std::end(Buffer);
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char *CurPtr = EndPtr;
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do {
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*--CurPtr = '0' + char(Value % 10);
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Value /= 10;
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} while (Value);
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return EndPtr - CurPtr;
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}
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static void writeWithCommas(raw_ostream &S, ArrayRef<char> Buffer) {
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assert(!Buffer.empty());
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ArrayRef<char> ThisGroup;
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int InitialDigits = ((Buffer.size() - 1) % 3) + 1;
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ThisGroup = Buffer.take_front(InitialDigits);
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S.write(ThisGroup.data(), ThisGroup.size());
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Buffer = Buffer.drop_front(InitialDigits);
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assert(Buffer.size() % 3 == 0);
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while (!Buffer.empty()) {
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S << ',';
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ThisGroup = Buffer.take_front(3);
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S.write(ThisGroup.data(), 3);
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Buffer = Buffer.drop_front(3);
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}
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}
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template <typename T>
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static void write_unsigned_impl(raw_ostream &S, T N, size_t MinDigits,
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IntegerStyle Style, bool IsNegative) {
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static_assert(std::is_unsigned<T>::value, "Value is not unsigned!");
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char NumberBuffer[128];
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std::memset(NumberBuffer, '0', sizeof(NumberBuffer));
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size_t Len = 0;
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Len = format_to_buffer(N, NumberBuffer);
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if (IsNegative)
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S << '-';
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if (Len < MinDigits && Style != IntegerStyle::Number) {
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for (size_t I = Len; I < MinDigits; ++I)
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S << '0';
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}
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if (Style == IntegerStyle::Number) {
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writeWithCommas(S, ArrayRef<char>(std::end(NumberBuffer) - Len, Len));
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} else {
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S.write(std::end(NumberBuffer) - Len, Len);
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}
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}
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template <typename T>
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static void write_unsigned(raw_ostream &S, T N, size_t MinDigits,
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IntegerStyle Style, bool IsNegative = false) {
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// Output using 32-bit div/mod if possible.
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if (N == static_cast<uint32_t>(N))
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write_unsigned_impl(S, static_cast<uint32_t>(N), MinDigits, Style,
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IsNegative);
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else
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write_unsigned_impl(S, N, MinDigits, Style, IsNegative);
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}
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template <typename T>
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static void write_signed(raw_ostream &S, T N, size_t MinDigits,
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IntegerStyle Style) {
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static_assert(std::is_signed<T>::value, "Value is not signed!");
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using UnsignedT = typename std::make_unsigned<T>::type;
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if (N >= 0) {
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write_unsigned(S, static_cast<UnsignedT>(N), MinDigits, Style);
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return;
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}
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UnsignedT UN = -(UnsignedT)N;
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write_unsigned(S, UN, MinDigits, Style, true);
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}
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void llvm::write_integer(raw_ostream &S, unsigned int N, size_t MinDigits,
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IntegerStyle Style) {
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write_unsigned(S, N, MinDigits, Style);
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}
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void llvm::write_integer(raw_ostream &S, int N, size_t MinDigits,
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IntegerStyle Style) {
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write_signed(S, N, MinDigits, Style);
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}
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void llvm::write_integer(raw_ostream &S, unsigned long N, size_t MinDigits,
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IntegerStyle Style) {
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write_unsigned(S, N, MinDigits, Style);
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}
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void llvm::write_integer(raw_ostream &S, long N, size_t MinDigits,
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IntegerStyle Style) {
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write_signed(S, N, MinDigits, Style);
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}
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void llvm::write_integer(raw_ostream &S, unsigned long long N, size_t MinDigits,
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IntegerStyle Style) {
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write_unsigned(S, N, MinDigits, Style);
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}
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void llvm::write_integer(raw_ostream &S, long long N, size_t MinDigits,
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IntegerStyle Style) {
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write_signed(S, N, MinDigits, Style);
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}
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void llvm::write_hex(raw_ostream &S, uint64_t N, HexPrintStyle Style,
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Optional<size_t> Width) {
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const size_t kMaxWidth = 128u;
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size_t W = std::min(kMaxWidth, Width.getValueOr(0u));
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unsigned Nibbles = (64 - countLeadingZeros(N) + 3) / 4;
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bool Prefix = (Style == HexPrintStyle::PrefixLower ||
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Style == HexPrintStyle::PrefixUpper);
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bool Upper =
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(Style == HexPrintStyle::Upper || Style == HexPrintStyle::PrefixUpper);
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unsigned PrefixChars = Prefix ? 2 : 0;
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unsigned NumChars =
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std::max(static_cast<unsigned>(W), std::max(1u, Nibbles) + PrefixChars);
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char NumberBuffer[kMaxWidth];
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::memset(NumberBuffer, '0', llvm::array_lengthof(NumberBuffer));
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if (Prefix)
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NumberBuffer[1] = 'x';
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char *EndPtr = NumberBuffer + NumChars;
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char *CurPtr = EndPtr;
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while (N) {
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unsigned char x = static_cast<unsigned char>(N) % 16;
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*--CurPtr = hexdigit(x, !Upper);
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N /= 16;
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}
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S.write(NumberBuffer, NumChars);
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}
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void llvm::write_double(raw_ostream &S, double N, FloatStyle Style,
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Optional<size_t> Precision) {
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size_t Prec = Precision.getValueOr(getDefaultPrecision(Style));
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if (std::isnan(N)) {
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S << "nan";
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return;
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} else if (std::isinf(N)) {
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S << "INF";
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return;
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}
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char Letter;
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if (Style == FloatStyle::Exponent)
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Letter = 'e';
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else if (Style == FloatStyle::ExponentUpper)
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Letter = 'E';
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else
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Letter = 'f';
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SmallString<8> Spec;
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llvm::raw_svector_ostream Out(Spec);
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Out << "%." << Prec << Letter;
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if (Style == FloatStyle::Exponent || Style == FloatStyle::ExponentUpper) {
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#ifdef _WIN32
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// On MSVCRT and compatible, output of %e is incompatible to Posix
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// by default. Number of exponent digits should be at least 2. "%+03d"
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// FIXME: Implement our formatter to here or Support/Format.h!
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#if defined(__MINGW32__)
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// FIXME: It should be generic to C++11.
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if (N == 0.0 && std::signbit(N)) {
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char NegativeZero[] = "-0.000000e+00";
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if (Style == FloatStyle::ExponentUpper)
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NegativeZero[strlen(NegativeZero) - 4] = 'E';
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S << NegativeZero;
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return;
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}
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#else
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int fpcl = _fpclass(N);
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// negative zero
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if (fpcl == _FPCLASS_NZ) {
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char NegativeZero[] = "-0.000000e+00";
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if (Style == FloatStyle::ExponentUpper)
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NegativeZero[strlen(NegativeZero) - 4] = 'E';
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S << NegativeZero;
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return;
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}
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#endif
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char buf[32];
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unsigned len;
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len = format(Spec.c_str(), N).snprint(buf, sizeof(buf));
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if (len <= sizeof(buf) - 2) {
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if (len >= 5 && (buf[len - 5] == 'e' || buf[len - 5] == 'E') &&
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buf[len - 3] == '0') {
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int cs = buf[len - 4];
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if (cs == '+' || cs == '-') {
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int c1 = buf[len - 2];
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int c0 = buf[len - 1];
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if (isdigit(static_cast<unsigned char>(c1)) &&
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isdigit(static_cast<unsigned char>(c0))) {
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// Trim leading '0': "...e+012" -> "...e+12\0"
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buf[len - 3] = c1;
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buf[len - 2] = c0;
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buf[--len] = 0;
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}
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}
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}
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S << buf;
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return;
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}
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#endif
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}
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if (Style == FloatStyle::Percent)
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N *= 100.0;
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char Buf[32];
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format(Spec.c_str(), N).snprint(Buf, sizeof(Buf));
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S << Buf;
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if (Style == FloatStyle::Percent)
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S << '%';
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}
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bool llvm::isPrefixedHexStyle(HexPrintStyle S) {
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return (S == HexPrintStyle::PrefixLower || S == HexPrintStyle::PrefixUpper);
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}
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size_t llvm::getDefaultPrecision(FloatStyle Style) {
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switch (Style) {
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case FloatStyle::Exponent:
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case FloatStyle::ExponentUpper:
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return 6; // Number of decimal places.
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case FloatStyle::Fixed:
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case FloatStyle::Percent:
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return 2; // Number of decimal places.
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}
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LLVM_BUILTIN_UNREACHABLE;
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}
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