1 //===--- LiteralSupport.h ---------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the NumericLiteralParser, CharLiteralParser, and
11 // StringLiteralParser interfaces.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CLANG_LEX_LITERALSUPPORT_H
16 #define LLVM_CLANG_LEX_LITERALSUPPORT_H
18 #include "clang/Basic/CharInfo.h"
19 #include "clang/Basic/LLVM.h"
20 #include "clang/Basic/TokenKinds.h"
21 #include "llvm/ADT/APFloat.h"
22 #include "llvm/ADT/ArrayRef.h"
23 #include "llvm/ADT/SmallString.h"
24 #include "llvm/ADT/StringRef.h"
25 #include "llvm/Support/DataTypes.h"
29 class DiagnosticsEngine;
37 /// Copy characters from Input to Buf, expanding any UCNs.
38 void expandUCNs(SmallVectorImpl<char> &Buf, StringRef Input);
40 /// NumericLiteralParser - This performs strict semantic analysis of the content
41 /// of a ppnumber, classifying it as either integer, floating, or erroneous,
42 /// determines the radix of the value and can convert it to a useful value.
43 class NumericLiteralParser {
44 Preprocessor &PP; // needed for diagnostics
46 const char *const ThisTokBegin;
47 const char *const ThisTokEnd;
48 const char *DigitsBegin, *SuffixBegin; // markers
49 const char *s; // cursor
53 bool saw_exponent, saw_period, saw_ud_suffix;
55 SmallString<32> UDSuffixBuf;
58 NumericLiteralParser(StringRef TokSpelling,
59 SourceLocation TokLoc,
63 bool isLong : 1; // This is *not* set for long long.
65 bool isHalf : 1; // 1.0h
66 bool isFloat : 1; // 1.0f
67 bool isImaginary : 1; // 1.0i
68 bool isFloat16 : 1; // 1.0f16
69 bool isFloat128 : 1; // 1.0q
70 uint8_t MicrosoftInteger; // Microsoft suffix extension i8, i16, i32, or i64.
72 bool isIntegerLiteral() const {
73 return !saw_period && !saw_exponent;
75 bool isFloatingLiteral() const {
76 return saw_period || saw_exponent;
79 bool hasUDSuffix() const {
82 StringRef getUDSuffix() const {
83 assert(saw_ud_suffix);
86 unsigned getUDSuffixOffset() const {
87 assert(saw_ud_suffix);
88 return SuffixBegin - ThisTokBegin;
91 static bool isValidUDSuffix(const LangOptions &LangOpts, StringRef Suffix);
93 unsigned getRadix() const { return radix; }
95 /// GetIntegerValue - Convert this numeric literal value to an APInt that
96 /// matches Val's input width. If there is an overflow (i.e., if the unsigned
97 /// value read is larger than the APInt's bits will hold), set Val to the low
98 /// bits of the result and return true. Otherwise, return false.
99 bool GetIntegerValue(llvm::APInt &Val);
101 /// GetFloatValue - Convert this numeric literal to a floating value, using
102 /// the specified APFloat fltSemantics (specifying float, double, etc).
103 /// The optional bool isExact (passed-by-reference) has its value
104 /// set to true if the returned APFloat can represent the number in the
105 /// literal exactly, and false otherwise.
106 llvm::APFloat::opStatus GetFloatValue(llvm::APFloat &Result);
110 void ParseNumberStartingWithZero(SourceLocation TokLoc);
111 void ParseDecimalOrOctalCommon(SourceLocation TokLoc);
113 static bool isDigitSeparator(char C) { return C == '\''; }
115 /// \brief Determine whether the sequence of characters [Start, End) contains
116 /// any real digits (not digit separators).
117 bool containsDigits(const char *Start, const char *End) {
118 return Start != End && (Start + 1 != End || !isDigitSeparator(Start[0]));
121 enum CheckSeparatorKind { CSK_BeforeDigits, CSK_AfterDigits };
123 /// \brief Ensure that we don't have a digit separator here.
124 void checkSeparator(SourceLocation TokLoc, const char *Pos,
125 CheckSeparatorKind IsAfterDigits);
127 /// SkipHexDigits - Read and skip over any hex digits, up to End.
128 /// Return a pointer to the first non-hex digit or End.
129 const char *SkipHexDigits(const char *ptr) {
130 while (ptr != ThisTokEnd && (isHexDigit(*ptr) || isDigitSeparator(*ptr)))
135 /// SkipOctalDigits - Read and skip over any octal digits, up to End.
136 /// Return a pointer to the first non-hex digit or End.
137 const char *SkipOctalDigits(const char *ptr) {
138 while (ptr != ThisTokEnd &&
139 ((*ptr >= '0' && *ptr <= '7') || isDigitSeparator(*ptr)))
144 /// SkipDigits - Read and skip over any digits, up to End.
145 /// Return a pointer to the first non-hex digit or End.
146 const char *SkipDigits(const char *ptr) {
147 while (ptr != ThisTokEnd && (isDigit(*ptr) || isDigitSeparator(*ptr)))
152 /// SkipBinaryDigits - Read and skip over any binary digits, up to End.
153 /// Return a pointer to the first non-binary digit or End.
154 const char *SkipBinaryDigits(const char *ptr) {
155 while (ptr != ThisTokEnd &&
156 (*ptr == '0' || *ptr == '1' || isDigitSeparator(*ptr)))
163 /// CharLiteralParser - Perform interpretation and semantic analysis of a
164 /// character literal.
165 class CharLiteralParser {
170 SmallString<32> UDSuffixBuf;
171 unsigned UDSuffixOffset;
173 CharLiteralParser(const char *begin, const char *end,
174 SourceLocation Loc, Preprocessor &PP,
175 tok::TokenKind kind);
177 bool hadError() const { return HadError; }
178 bool isAscii() const { return Kind == tok::char_constant; }
179 bool isWide() const { return Kind == tok::wide_char_constant; }
180 bool isUTF8() const { return Kind == tok::utf8_char_constant; }
181 bool isUTF16() const { return Kind == tok::utf16_char_constant; }
182 bool isUTF32() const { return Kind == tok::utf32_char_constant; }
183 bool isMultiChar() const { return IsMultiChar; }
184 uint64_t getValue() const { return Value; }
185 StringRef getUDSuffix() const { return UDSuffixBuf; }
186 unsigned getUDSuffixOffset() const {
187 assert(!UDSuffixBuf.empty() && "no ud-suffix");
188 return UDSuffixOffset;
192 /// StringLiteralParser - This decodes string escape characters and performs
193 /// wide string analysis and Translation Phase #6 (concatenation of string
194 /// literals) (C99 5.1.1.2p1).
195 class StringLiteralParser {
196 const SourceManager &SM;
197 const LangOptions &Features;
198 const TargetInfo &Target;
199 DiagnosticsEngine *Diags;
201 unsigned MaxTokenLength;
203 unsigned CharByteWidth;
205 SmallString<512> ResultBuf;
206 char *ResultPtr; // cursor
207 SmallString<32> UDSuffixBuf;
208 unsigned UDSuffixToken;
209 unsigned UDSuffixOffset;
211 StringLiteralParser(ArrayRef<Token> StringToks,
212 Preprocessor &PP, bool Complain = true);
213 StringLiteralParser(ArrayRef<Token> StringToks,
214 const SourceManager &sm, const LangOptions &features,
215 const TargetInfo &target,
216 DiagnosticsEngine *diags = nullptr)
217 : SM(sm), Features(features), Target(target), Diags(diags),
218 MaxTokenLength(0), SizeBound(0), CharByteWidth(0), Kind(tok::unknown),
219 ResultPtr(ResultBuf.data()), hadError(false), Pascal(false) {
227 StringRef GetString() const {
228 return StringRef(ResultBuf.data(), GetStringLength());
230 unsigned GetStringLength() const { return ResultPtr-ResultBuf.data(); }
232 unsigned GetNumStringChars() const {
233 return GetStringLength() / CharByteWidth;
235 /// getOffsetOfStringByte - This function returns the offset of the
236 /// specified byte of the string data represented by Token. This handles
237 /// advancing over escape sequences in the string.
239 /// If the Diagnostics pointer is non-null, then this will do semantic
240 /// checking of the string literal and emit errors and warnings.
241 unsigned getOffsetOfStringByte(const Token &TheTok, unsigned ByteNo) const;
243 bool isAscii() const { return Kind == tok::string_literal; }
244 bool isWide() const { return Kind == tok::wide_string_literal; }
245 bool isUTF8() const { return Kind == tok::utf8_string_literal; }
246 bool isUTF16() const { return Kind == tok::utf16_string_literal; }
247 bool isUTF32() const { return Kind == tok::utf32_string_literal; }
248 bool isPascal() const { return Pascal; }
250 StringRef getUDSuffix() const { return UDSuffixBuf; }
252 /// Get the index of a token containing a ud-suffix.
253 unsigned getUDSuffixToken() const {
254 assert(!UDSuffixBuf.empty() && "no ud-suffix");
255 return UDSuffixToken;
257 /// Get the spelling offset of the first byte of the ud-suffix.
258 unsigned getUDSuffixOffset() const {
259 assert(!UDSuffixBuf.empty() && "no ud-suffix");
260 return UDSuffixOffset;
263 static bool isValidUDSuffix(const LangOptions &LangOpts, StringRef Suffix);
266 void init(ArrayRef<Token> StringToks);
267 bool CopyStringFragment(const Token &Tok, const char *TokBegin,
269 void DiagnoseLexingError(SourceLocation Loc);
272 } // end namespace clang