LCOV - code coverage report
Current view: top level - include/llvm/Support - FormatProviders.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 108 112 96.4 %
Date: 2017-09-14 15:23:50 Functions: 30 53 56.6 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===- FormatProviders.h - Formatters for common LLVM types -----*- C++ -*-===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file implements format providers for many common LLVM types, for example
      11             : // allowing precision and width specifiers for scalar and string types.
      12             : //
      13             : //===----------------------------------------------------------------------===//
      14             : 
      15             : #ifndef LLVM_SUPPORT_FORMATPROVIDERS_H
      16             : #define LLVM_SUPPORT_FORMATPROVIDERS_H
      17             : 
      18             : #include "llvm/ADT/Optional.h"
      19             : #include "llvm/ADT/STLExtras.h"
      20             : #include "llvm/ADT/StringSwitch.h"
      21             : #include "llvm/ADT/Twine.h"
      22             : #include "llvm/Support/FormatVariadicDetails.h"
      23             : #include "llvm/Support/NativeFormatting.h"
      24             : 
      25             : #include <type_traits>
      26             : #include <vector>
      27             : 
      28             : namespace llvm {
      29             : namespace detail {
      30             : template <typename T>
      31             : struct use_integral_formatter
      32             :     : public std::integral_constant<
      33             :           bool, is_one_of<T, uint8_t, int16_t, uint16_t, int32_t, uint32_t,
      34             :                           int64_t, uint64_t, int, unsigned, long, unsigned long,
      35             :                           long long, unsigned long long>::value> {};
      36             : 
      37             : template <typename T>
      38             : struct use_char_formatter
      39             :     : public std::integral_constant<bool, std::is_same<T, char>::value> {};
      40             : 
      41             : template <typename T>
      42             : struct is_cstring
      43             :     : public std::integral_constant<bool,
      44             :                                     is_one_of<T, char *, const char *>::value> {
      45             : };
      46             : 
      47             : template <typename T>
      48             : struct use_string_formatter
      49             :     : public std::integral_constant<bool,
      50             :                                     std::is_convertible<T, llvm::StringRef>::value> {};
      51             : 
      52             : template <typename T>
      53             : struct use_pointer_formatter
      54             :     : public std::integral_constant<bool, std::is_pointer<T>::value &&
      55             :                                               !is_cstring<T>::value> {};
      56             : 
      57             : template <typename T>
      58             : struct use_double_formatter
      59             :     : public std::integral_constant<bool, std::is_floating_point<T>::value> {};
      60             : 
      61             : class HelperFunctions {
      62             : protected:
      63         317 :   static Optional<size_t> parseNumericPrecision(StringRef Str) {
      64             :     size_t Prec;
      65         317 :     Optional<size_t> Result;
      66         317 :     if (Str.empty())
      67         489 :       Result = None;
      68         154 :     else if (Str.getAsInteger(10, Prec)) {
      69             :       assert(false && "Invalid precision specifier");
      70           0 :       Result = None;
      71             :     } else {
      72             :       assert(Prec < 100 && "Precision out of range");
      73         462 :       Result = std::min<size_t>(99u, Prec);
      74             :     }
      75         317 :     return Result;
      76             :   }
      77             : 
      78        6453 :   static bool consumeHexStyle(StringRef &Str, HexPrintStyle &Style) {
      79        6453 :     if (!Str.startswith_lower("x"))
      80             :       return false;
      81             : 
      82        2375 :     if (Str.consume_front("x-"))
      83           5 :       Style = HexPrintStyle::Lower;
      84        2846 :     else if (Str.consume_front("X-"))
      85         481 :       Style = HexPrintStyle::Upper;
      86        1935 :     else if (Str.consume_front("x+") || Str.consume_front("x"))
      87          51 :       Style = HexPrintStyle::PrefixLower;
      88        3666 :     else if (Str.consume_front("X+") || Str.consume_front("X"))
      89        1833 :       Style = HexPrintStyle::PrefixUpper;
      90             :     return true;
      91             :   }
      92             : 
      93        2376 :   static size_t consumeNumHexDigits(StringRef &Str, HexPrintStyle Style,
      94             :                                     size_t Default) {
      95        2376 :     Str.consumeInteger(10, Default);
      96        2376 :     if (isPrefixedHexStyle(Style))
      97        1890 :       Default += 2;
      98        2376 :     return Default;
      99             :   }
     100             : };
     101             : }
     102             : 
     103             : /// Implementation of format_provider<T> for integral arithmetic types.
     104             : ///
     105             : /// The options string of an integral type has the grammar:
     106             : ///
     107             : ///   integer_options   :: [style][digits]
     108             : ///   style             :: <see table below>
     109             : ///   digits            :: <non-negative integer> 0-99
     110             : ///
     111             : ///   ==========================================================================
     112             : ///   |  style  |     Meaning          |      Example     | Digits Meaning     |
     113             : ///   --------------------------------------------------------------------------
     114             : ///   |         |                      |  Input |  Output |                    |
     115             : ///   ==========================================================================
     116             : ///   |   x-    | Hex no prefix, lower |   42   |    2a   | Minimum # digits   |
     117             : ///   |   X-    | Hex no prefix, upper |   42   |    2A   | Minimum # digits   |
     118             : ///   | x+ / x  | Hex + prefix, lower  |   42   |   0x2a  | Minimum # digits   |
     119             : ///   | X+ / X  | Hex + prefix, upper  |   42   |   0x2A  | Minimum # digits   |
     120             : ///   | N / n   | Digit grouped number | 123456 | 123,456 | Ignored            |
     121             : ///   | D / d   | Integer              | 100000 | 100000  | Ignored            |
     122             : ///   | (empty) | Same as D / d        |        |         |                    |
     123             : ///   ==========================================================================
     124             : ///
     125             : 
     126             : template <typename T>
     127             : struct format_provider<
     128             :     T, typename std::enable_if<detail::use_integral_formatter<T>::value>::type>
     129             :     : public detail::HelperFunctions {
     130             : private:
     131             : public:
     132        6441 :   static void format(const T &V, llvm::raw_ostream &Stream, StringRef Style) {
     133             :     HexPrintStyle HS;
     134        6441 :     size_t Digits = 0;
     135        6441 :     if (consumeHexStyle(Style, HS)) {
     136        2364 :       Digits = consumeNumHexDigits(Style, HS, 0);
     137        4728 :       write_hex(Stream, V, HS, Digits);
     138        2364 :       return;
     139             :     }
     140             : 
     141        4077 :     IntegerStyle IS = IntegerStyle::Integer;
     142        4145 :     if (Style.consume_front("N") || Style.consume_front("n"))
     143             :       IS = IntegerStyle::Number;
     144        4013 :     else if (Style.consume_front("D") || Style.consume_front("d"))
     145             :       IS = IntegerStyle::Integer;
     146             : 
     147        4077 :     Style.consumeInteger(10, Digits);
     148             :     assert(Style.empty() && "Invalid integral format style!");
     149        4077 :     write_integer(Stream, V, Digits, IS);
     150             :   }
     151             : };
     152             : 
     153             : /// Implementation of format_provider<T> for integral pointer types.
     154             : ///
     155             : /// The options string of a pointer type has the grammar:
     156             : ///
     157             : ///   pointer_options   :: [style][precision]
     158             : ///   style             :: <see table below>
     159             : ///   digits            :: <non-negative integer> 0-sizeof(void*)
     160             : ///
     161             : ///   ==========================================================================
     162             : ///   |   S     |     Meaning          |                Example                |
     163             : ///   --------------------------------------------------------------------------
     164             : ///   |         |                      |       Input       |      Output       |
     165             : ///   ==========================================================================
     166             : ///   |   x-    | Hex no prefix, lower |    0xDEADBEEF     |     deadbeef      |
     167             : ///   |   X-    | Hex no prefix, upper |    0xDEADBEEF     |     DEADBEEF      |
     168             : ///   | x+ / x  | Hex + prefix, lower  |    0xDEADBEEF     |    0xdeadbeef     |
     169             : ///   | X+ / X  | Hex + prefix, upper  |    0xDEADBEEF     |    0xDEADBEEF     |
     170             : ///   | (empty) | Same as X+ / X       |                   |                   |
     171             : ///   ==========================================================================
     172             : ///
     173             : /// The default precision is the number of nibbles in a machine word, and in all
     174             : /// cases indicates the minimum number of nibbles to print.
     175             : template <typename T>
     176             : struct format_provider<
     177             :     T, typename std::enable_if<detail::use_pointer_formatter<T>::value>::type>
     178             :     : public detail::HelperFunctions {
     179             : private:
     180             : public:
     181          12 :   static void format(const T &V, llvm::raw_ostream &Stream, StringRef Style) {
     182          12 :     HexPrintStyle HS = HexPrintStyle::PrefixUpper;
     183          12 :     consumeHexStyle(Style, HS);
     184          12 :     size_t Digits = consumeNumHexDigits(Style, HS, sizeof(void *) * 2);
     185          24 :     write_hex(Stream, reinterpret_cast<std::uintptr_t>(V), HS, Digits);
     186          12 :   }
     187             : };
     188             : 
     189             : /// Implementation of format_provider<T> for c-style strings and string
     190             : /// objects such as std::string and llvm::StringRef.
     191             : ///
     192             : /// The options string of a string type has the grammar:
     193             : ///
     194             : ///   string_options :: [length]
     195             : ///
     196             : /// where `length` is an optional integer specifying the maximum number of
     197             : /// characters in the string to print.  If `length` is omitted, the string is
     198             : /// printed up to the null terminator.
     199             : 
     200             : template <typename T>
     201             : struct format_provider<
     202             :     T, typename std::enable_if<detail::use_string_formatter<T>::value>::type> {
     203        7562 :   static void format(const T &V, llvm::raw_ostream &Stream, StringRef Style) {
     204        7562 :     size_t N = StringRef::npos;
     205        7572 :     if (!Style.empty() && Style.getAsInteger(10, N)) {
     206             :       assert(false && "Style is not a valid integer");
     207             :     }
     208        7846 :     llvm::StringRef S = V;
     209       15124 :     Stream << S.substr(0, N);
     210        7562 :   }
     211             : };
     212             : 
     213             : /// Implementation of format_provider<T> for llvm::Twine.
     214             : ///
     215             : /// This follows the same rules as the string formatter.
     216             : 
     217             : template <> struct format_provider<Twine> {
     218         112 :   static void format(const Twine &V, llvm::raw_ostream &Stream,
     219             :                      StringRef Style) {
     220         224 :     format_provider<std::string>::format(V.str(), Stream, Style);
     221         112 :   }
     222             : };
     223             : 
     224             : /// Implementation of format_provider<T> for characters.
     225             : ///
     226             : /// The options string of a character type has the grammar:
     227             : ///
     228             : ///   char_options :: (empty) | [integer_options]
     229             : ///
     230             : /// If `char_options` is empty, the character is displayed as an ASCII
     231             : /// character.  Otherwise, it is treated as an integer options string.
     232             : ///
     233             : template <typename T>
     234             : struct format_provider<
     235             :     T, typename std::enable_if<detail::use_char_formatter<T>::value>::type> {
     236       12619 :   static void format(const char &V, llvm::raw_ostream &Stream,
     237             :                      StringRef Style) {
     238       12619 :     if (Style.empty())
     239       12617 :       Stream << V;
     240             :     else {
     241           2 :       int X = static_cast<int>(V);
     242           2 :       format_provider<int>::format(X, Stream, Style);
     243             :     }
     244       12619 :   }
     245             : };
     246             : 
     247             : /// Implementation of format_provider<T> for type `bool`
     248             : ///
     249             : /// The options string of a boolean type has the grammar:
     250             : ///
     251             : ///   bool_options :: "" | "Y" | "y" | "D" | "d" | "T" | "t"
     252             : ///
     253             : ///   ==================================
     254             : ///   |    C    |     Meaning          |
     255             : ///   ==================================
     256             : ///   |    Y    |       YES / NO       |
     257             : ///   |    y    |       yes / no       |
     258             : ///   |  D / d  |    Integer 0 or 1    |
     259             : ///   |    T    |     TRUE / FALSE     |
     260             : ///   |    t    |     true / false     |
     261             : ///   | (empty) |   Equivalent to 't'  |
     262             : ///   ==================================
     263             : template <> struct format_provider<bool> {
     264         170 :   static void format(const bool &B, llvm::raw_ostream &Stream,
     265             :                      StringRef Style) {
     266         510 :     Stream << StringSwitch<const char *>(Style)
     267         510 :                   .Case("Y", B ? "YES" : "NO")
     268         510 :                   .Case("y", B ? "yes" : "no")
     269         510 :                   .CaseLower("D", B ? "1" : "0")
     270         510 :                   .Case("T", B ? "TRUE" : "FALSE")
     271         510 :                   .Cases("t", "", B ? "true" : "false")
     272         340 :                   .Default(B ? "1" : "0");
     273         170 :   }
     274             : };
     275             : 
     276             : /// Implementation of format_provider<T> for floating point types.
     277             : ///
     278             : /// The options string of a floating point type has the format:
     279             : ///
     280             : ///   float_options   :: [style][precision]
     281             : ///   style           :: <see table below>
     282             : ///   precision       :: <non-negative integer> 0-99
     283             : ///
     284             : ///   =====================================================
     285             : ///   |  style  |     Meaning          |      Example     |
     286             : ///   -----------------------------------------------------
     287             : ///   |         |                      |  Input |  Output |
     288             : ///   =====================================================
     289             : ///   | P / p   | Percentage           |  0.05  |  5.00%  |
     290             : ///   | F / f   | Fixed point          |   1.0  |  1.00   |
     291             : ///   |   E     | Exponential with E   | 100000 | 1.0E+05 |
     292             : ///   |   e     | Exponential with e   | 100000 | 1.0e+05 |
     293             : ///   | (empty) | Same as F / f        |        |         |
     294             : ///   =====================================================
     295             : ///
     296             : /// The default precision is 6 for exponential (E / e) and 2 for everything
     297             : /// else.
     298             : 
     299             : template <typename T>
     300             : struct format_provider<
     301             :     T, typename std::enable_if<detail::use_double_formatter<T>::value>::type>
     302             :     : public detail::HelperFunctions {
     303         317 :   static void format(const T &V, llvm::raw_ostream &Stream, StringRef Style) {
     304             :     FloatStyle S;
     305         373 :     if (Style.consume_front("P") || Style.consume_front("p"))
     306             :       S = FloatStyle::Percent;
     307         411 :     else if (Style.consume_front("F") || Style.consume_front("f"))
     308             :       S = FloatStyle::Fixed;
     309         125 :     else if (Style.consume_front("E"))
     310             :       S = FloatStyle::ExponentUpper;
     311          98 :     else if (Style.consume_front("e"))
     312             :       S = FloatStyle::Exponent;
     313             :     else
     314             :       S = FloatStyle::Fixed;
     315             : 
     316         634 :     Optional<size_t> Precision = parseNumericPrecision(Style);
     317         317 :     if (!Precision.hasValue())
     318         163 :       Precision = getDefaultPrecision(S);
     319             : 
     320         634 :     write_double(Stream, static_cast<double>(V), S, Precision);
     321         317 :   }
     322             : };
     323             : 
     324             : namespace detail {
     325             : template <typename IterT>
     326             : using IterValue = typename std::iterator_traits<IterT>::value_type;
     327             : 
     328             : template <typename IterT>
     329             : struct range_item_has_provider
     330             :     : public std::integral_constant<
     331             :           bool, !uses_missing_provider<IterValue<IterT>>::value> {};
     332             : }
     333             : 
     334             : /// Implementation of format_provider<T> for ranges.
     335             : ///
     336             : /// This will print an arbitrary range as a delimited sequence of items.
     337             : ///
     338             : /// The options string of a range type has the grammar:
     339             : ///
     340             : ///   range_style       ::= [separator] [element_style]
     341             : ///   separator         ::= "$" delimeted_expr
     342             : ///   element_style     ::= "@" delimeted_expr
     343             : ///   delimeted_expr    ::= "[" expr "]" | "(" expr ")" | "<" expr ">"
     344             : ///   expr              ::= <any string not containing delimeter>
     345             : ///
     346             : /// where the separator expression is the string to insert between consecutive
     347             : /// items in the range and the argument expression is the Style specification to
     348             : /// be used when formatting the underlying type.  The default separator if
     349             : /// unspecified is ' ' (space).  The syntax of the argument expression follows
     350             : /// whatever grammar is dictated by the format provider or format adapter used
     351             : /// to format the value type.
     352             : ///
     353             : /// Note that attempting to format an `iterator_range<T>` where no format
     354             : /// provider can be found for T will result in a compile error.
     355             : ///
     356             : 
     357             : template <typename IterT> class format_provider<llvm::iterator_range<IterT>> {
     358             :   using value = typename std::iterator_traits<IterT>::value_type;
     359             :   using reference = typename std::iterator_traits<IterT>::reference;
     360             : 
     361          54 :   static StringRef consumeOneOption(StringRef &Style, char Indicator,
     362             :                                     StringRef Default) {
     363          54 :     if (Style.empty())
     364          39 :       return Default;
     365          30 :     if (Style.front() != Indicator)
     366           1 :       return Default;
     367          14 :     Style = Style.drop_front();
     368          14 :     if (Style.empty()) {
     369             :       assert(false && "Invalid range style");
     370           0 :       return Default;
     371             :     }
     372             : 
     373          28 :     for (const char *D : {"[]", "<>", "()"}) {
     374          42 :       if (Style.front() != D[0])
     375           7 :         continue;
     376          14 :       size_t End = Style.find_first_of(D[1]);
     377          14 :       if (End == StringRef::npos) {
     378             :         assert(false && "Missing range option end delimeter!");
     379           0 :         return Default;
     380             :       }
     381          14 :       StringRef Result = Style.slice(1, End);
     382          28 :       Style = Style.drop_front(End + 1);
     383          14 :       return Result;
     384             :     }
     385             :     assert(false && "Invalid range style!");
     386           0 :     return Default;
     387             :   }
     388             : 
     389          27 :   static std::pair<StringRef, StringRef> parseOptions(StringRef Style) {
     390          27 :     StringRef Sep = consumeOneOption(Style, '$', ", ");
     391          27 :     StringRef Args = consumeOneOption(Style, '@', "");
     392             :     assert(Style.empty() && "Unexpected text in range option string!");
     393          27 :     return std::make_pair(Sep, Args);
     394             :   }
     395             : 
     396             : public:
     397             :   static_assert(detail::range_item_has_provider<IterT>::value,
     398             :                 "Range value_type does not have a format provider!");
     399          27 :   static void format(const llvm::iterator_range<IterT> &V,
     400             :                      llvm::raw_ostream &Stream, StringRef Style) {
     401             :     StringRef Sep;
     402             :     StringRef ArgStyle;
     403          81 :     std::tie(Sep, ArgStyle) = parseOptions(Style);
     404          27 :     auto Begin = V.begin();
     405          27 :     auto End = V.end();
     406          27 :     if (Begin != End) {
     407          72 :       auto Adapter =
     408          24 :           detail::build_format_adapter(std::forward<reference>(*Begin));
     409          24 :       Adapter.format(Stream, ArgStyle);
     410          24 :       ++Begin;
     411             :     }
     412         133 :     while (Begin != End) {
     413          53 :       Stream << Sep;
     414         159 :       auto Adapter =
     415          53 :           detail::build_format_adapter(std::forward<reference>(*Begin));
     416          53 :       Adapter.format(Stream, ArgStyle);
     417          53 :       ++Begin;
     418             :     }
     419          27 :   }
     420             : };
     421             : }
     422             : 
     423             : #endif

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