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//===--- LiteralSupport.h ---------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the NumericLiteralParser, CharLiteralParser, and
// StringLiteralParser interfaces.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LEX_LITERALSUPPORT_H
#define LLVM_CLANG_LEX_LITERALSUPPORT_H
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/TokenKinds.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/DataTypes.h"
namespace clang {
class DiagnosticsEngine;
class Preprocessor;
class Token;
class SourceLocation;
class TargetInfo;
class SourceManager;
class LangOptions;
/// Copy characters from Input to Buf, expanding any UCNs.
void expandUCNs(SmallVectorImpl<char> &Buf, StringRef Input);
/// Return true if the token corresponds to a function local predefined macro,
/// which expands to a string literal, that can be concatenated with other
/// string literals (only in Microsoft mode).
bool isFunctionLocalStringLiteralMacro(tok::TokenKind K, const LangOptions &LO);
/// Return true if the token is a string literal, or a function local
/// predefined macro, which expands to a string literal.
bool tokenIsLikeStringLiteral(const Token &Tok, const LangOptions &LO);
/// NumericLiteralParser - This performs strict semantic analysis of the content
/// of a ppnumber, classifying it as either integer, floating, or erroneous,
/// determines the radix of the value and can convert it to a useful value.
class NumericLiteralParser {
const SourceManager &SM;
const LangOptions &LangOpts;
DiagnosticsEngine &Diags;
const char *const ThisTokBegin;
const char *const ThisTokEnd;
const char *DigitsBegin, *SuffixBegin; // markers
const char *s; // cursor
unsigned radix;
bool saw_exponent, saw_period, saw_ud_suffix, saw_fixed_point_suffix;
SmallString<32> UDSuffixBuf;
public:
NumericLiteralParser(StringRef TokSpelling, SourceLocation TokLoc,
const SourceManager &SM, const LangOptions &LangOpts,
const TargetInfo &Target, DiagnosticsEngine &Diags);
bool hadError : 1;
bool isUnsigned : 1;
bool isLong : 1; // This is *not* set for long long.
bool isLongLong : 1;
bool isSizeT : 1; // 1z, 1uz (C++23)
bool isHalf : 1; // 1.0h
bool isFloat : 1; // 1.0f
bool isImaginary : 1; // 1.0i
bool isFloat16 : 1; // 1.0f16
bool isFloat128 : 1; // 1.0q
bool isFract : 1; // 1.0hr/r/lr/uhr/ur/ulr
bool isAccum : 1; // 1.0hk/k/lk/uhk/uk/ulk
bool isBitInt : 1; // 1wb, 1uwb (C23) or 1__wb, 1__uwb (Clang extension in C++
// mode)
uint8_t MicrosoftInteger; // Microsoft suffix extension i8, i16, i32, or i64.
bool isFixedPointLiteral() const {
return (saw_period || saw_exponent) && saw_fixed_point_suffix;
}
bool isIntegerLiteral() const {
return !saw_period && !saw_exponent && !isFixedPointLiteral();
}
bool isFloatingLiteral() const {
return (saw_period || saw_exponent) && !isFixedPointLiteral();
}
bool hasUDSuffix() const {
return saw_ud_suffix;
}
StringRef getUDSuffix() const {
assert(saw_ud_suffix);
return UDSuffixBuf;
}
unsigned getUDSuffixOffset() const {
assert(saw_ud_suffix);
return SuffixBegin - ThisTokBegin;
}
static bool isValidUDSuffix(const LangOptions &LangOpts, StringRef Suffix);
unsigned getRadix() const { return radix; }
/// GetIntegerValue - Convert this numeric literal value to an APInt that
/// matches Val's input width. If there is an overflow (i.e., if the unsigned
/// value read is larger than the APInt's bits will hold), set Val to the low
/// bits of the result and return true. Otherwise, return false.
bool GetIntegerValue(llvm::APInt &Val);
/// Convert this numeric literal to a floating value, using the specified
/// APFloat fltSemantics (specifying float, double, etc) and rounding mode.
llvm::APFloat::opStatus GetFloatValue(llvm::APFloat &Result,
llvm::RoundingMode RM);
/// GetFixedPointValue - Convert this numeric literal value into a
/// scaled integer that represents this value. Returns true if an overflow
/// occurred when calculating the integral part of the scaled integer or
/// calculating the digit sequence of the exponent.
bool GetFixedPointValue(llvm::APInt &StoreVal, unsigned Scale);
/// Get the digits that comprise the literal. This excludes any prefix or
/// suffix associated with the literal.
StringRef getLiteralDigits() const {
assert(!hadError && "cannot reliably get the literal digits with an error");
return StringRef(DigitsBegin, SuffixBegin - DigitsBegin);
}
private:
void ParseNumberStartingWithZero(SourceLocation TokLoc);
void ParseDecimalOrOctalCommon(SourceLocation TokLoc);
static bool isDigitSeparator(char C) { return C == '\''; }
/// Determine whether the sequence of characters [Start, End) contains
/// any real digits (not digit separators).
bool containsDigits(const char *Start, const char *End) {
return Start != End && (Start + 1 != End || !isDigitSeparator(Start[0]));
}
enum CheckSeparatorKind { CSK_BeforeDigits, CSK_AfterDigits };
/// Ensure that we don't have a digit separator here.
void checkSeparator(SourceLocation TokLoc, const char *Pos,
CheckSeparatorKind IsAfterDigits);
/// SkipHexDigits - Read and skip over any hex digits, up to End.
/// Return a pointer to the first non-hex digit or End.
const char *SkipHexDigits(const char *ptr) {
while (ptr != ThisTokEnd && (isHexDigit(*ptr) || isDigitSeparator(*ptr)))
ptr++;
return ptr;
}
/// SkipOctalDigits - Read and skip over any octal digits, up to End.
/// Return a pointer to the first non-hex digit or End.
const char *SkipOctalDigits(const char *ptr) {
while (ptr != ThisTokEnd &&
((*ptr >= '0' && *ptr <= '7') || isDigitSeparator(*ptr)))
ptr++;
return ptr;
}
/// SkipDigits - Read and skip over any digits, up to End.
/// Return a pointer to the first non-hex digit or End.
const char *SkipDigits(const char *ptr) {
while (ptr != ThisTokEnd && (isDigit(*ptr) || isDigitSeparator(*ptr)))
ptr++;
return ptr;
}
/// SkipBinaryDigits - Read and skip over any binary digits, up to End.
/// Return a pointer to the first non-binary digit or End.
const char *SkipBinaryDigits(const char *ptr) {
while (ptr != ThisTokEnd &&
(*ptr == '0' || *ptr == '1' || isDigitSeparator(*ptr)))
ptr++;
return ptr;
}
};
/// CharLiteralParser - Perform interpretation and semantic analysis of a
/// character literal.
class CharLiteralParser {
uint64_t Value;
tok::TokenKind Kind;
bool IsMultiChar;
bool HadError;
SmallString<32> UDSuffixBuf;
unsigned UDSuffixOffset;
public:
CharLiteralParser(const char *begin, const char *end,
SourceLocation Loc, Preprocessor &PP,
tok::TokenKind kind);
bool hadError() const { return HadError; }
bool isOrdinary() const { return Kind == tok::char_constant; }
bool isWide() const { return Kind == tok::wide_char_constant; }
bool isUTF8() const { return Kind == tok::utf8_char_constant; }
bool isUTF16() const { return Kind == tok::utf16_char_constant; }
bool isUTF32() const { return Kind == tok::utf32_char_constant; }
bool isMultiChar() const { return IsMultiChar; }
uint64_t getValue() const { return Value; }
StringRef getUDSuffix() const { return UDSuffixBuf; }
unsigned getUDSuffixOffset() const {
assert(!UDSuffixBuf.empty() && "no ud-suffix");
return UDSuffixOffset;
}
};
enum class StringLiteralEvalMethod {
Evaluated,
Unevaluated,
};
/// StringLiteralParser - This decodes string escape characters and performs
/// wide string analysis and Translation Phase #6 (concatenation of string
/// literals) (C99 5.1.1.2p1).
class StringLiteralParser {
const SourceManager &SM;
const LangOptions &Features;
const TargetInfo &Target;
DiagnosticsEngine *Diags;
unsigned MaxTokenLength;
unsigned SizeBound;
unsigned CharByteWidth;
tok::TokenKind Kind;
SmallString<512> ResultBuf;
char *ResultPtr; // cursor
SmallString<32> UDSuffixBuf;
unsigned UDSuffixToken;
unsigned UDSuffixOffset;
StringLiteralEvalMethod EvalMethod;
public:
StringLiteralParser(ArrayRef<Token> StringToks, Preprocessor &PP,
StringLiteralEvalMethod StringMethod =
StringLiteralEvalMethod::Evaluated);
StringLiteralParser(ArrayRef<Token> StringToks, const SourceManager &sm,
const LangOptions &features, const TargetInfo &target,
DiagnosticsEngine *diags = nullptr)
: SM(sm), Features(features), Target(target), Diags(diags),
MaxTokenLength(0), SizeBound(0), CharByteWidth(0), Kind(tok::unknown),
ResultPtr(ResultBuf.data()),
EvalMethod(StringLiteralEvalMethod::Evaluated), hadError(false),
Pascal(false) {
init(StringToks);
}
bool hadError;
bool Pascal;
StringRef GetString() const {
return StringRef(ResultBuf.data(), GetStringLength());
}
unsigned GetStringLength() const { return ResultPtr-ResultBuf.data(); }
unsigned GetNumStringChars() const {
return GetStringLength() / CharByteWidth;
}
/// getOffsetOfStringByte - This function returns the offset of the
/// specified byte of the string data represented by Token. This handles
/// advancing over escape sequences in the string.
///
/// If the Diagnostics pointer is non-null, then this will do semantic
/// checking of the string literal and emit errors and warnings.
unsigned getOffsetOfStringByte(const Token &TheTok, unsigned ByteNo) const;
bool isOrdinary() const { return Kind == tok::string_literal; }
bool isWide() const { return Kind == tok::wide_string_literal; }
bool isUTF8() const { return Kind == tok::utf8_string_literal; }
bool isUTF16() const { return Kind == tok::utf16_string_literal; }
bool isUTF32() const { return Kind == tok::utf32_string_literal; }
bool isPascal() const { return Pascal; }
bool isUnevaluated() const {
return EvalMethod == StringLiteralEvalMethod::Unevaluated;
}
StringRef getUDSuffix() const { return UDSuffixBuf; }
/// Get the index of a token containing a ud-suffix.
unsigned getUDSuffixToken() const {
assert(!UDSuffixBuf.empty() && "no ud-suffix");
return UDSuffixToken;
}
/// Get the spelling offset of the first byte of the ud-suffix.
unsigned getUDSuffixOffset() const {
assert(!UDSuffixBuf.empty() && "no ud-suffix");
return UDSuffixOffset;
}
static bool isValidUDSuffix(const LangOptions &LangOpts, StringRef Suffix);
private:
void init(ArrayRef<Token> StringToks);
bool CopyStringFragment(const Token &Tok, const char *TokBegin,
StringRef Fragment);
void DiagnoseLexingError(SourceLocation Loc);
};
} // end namespace clang
#endif
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