//===----------------------------------------------------------------------===//
#include "llvm/MC/MCParser/AsmLexer.h"
-#include "llvm/Support/SMLoc.h"
-#include "llvm/Support/MemoryBuffer.h"
#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/SMLoc.h"
+#include <cctype>
#include <cerrno>
#include <cstdio>
#include <cstdlib>
AsmLexer::AsmLexer(const MCAsmInfo &_MAI) : MAI(_MAI) {
CurBuf = NULL;
CurPtr = NULL;
+ isAtStartOfLine = true;
+ AllowAtInIdentifier = !StringRef(MAI.getCommentString()).startswith("@");
}
AsmLexer::~AsmLexer() {
void AsmLexer::setBuffer(const MemoryBuffer *buf, const char *ptr) {
CurBuf = buf;
-
+
if (ptr)
CurPtr = ptr;
else
CurPtr = CurBuf->getBufferStart();
-
+
TokStart = 0;
}
/// location. This is defined to always return AsmToken::Error.
AsmToken AsmLexer::ReturnError(const char *Loc, const std::string &Msg) {
SetError(SMLoc::getFromPointer(Loc), Msg);
-
+
return AsmToken(AsmToken::Error, StringRef(Loc, 0));
}
// a random nul in the file. Disambiguate that here.
if (CurPtr-1 != CurBuf->getBufferEnd())
return 0; // Just whitespace.
-
+
// Otherwise, return end of file.
- --CurPtr; // Another call to lex will return EOF again.
+ --CurPtr; // Another call to lex will return EOF again.
return EOF;
}
}
StringRef(TokStart, CurPtr - TokStart));
}
-/// LexIdentifier: [a-zA-Z_.][a-zA-Z0-9_$.@]*
-static bool IsIdentifierChar(char c) {
- return isalnum(c) || c == '_' || c == '$' || c == '.' || c == '@';
+/// LexHexFloatLiteral matches essentially (.[0-9a-fA-F]*)?[pP][+-]?[0-9a-fA-F]+
+/// while making sure there are enough actual digits around for the constant to
+/// be valid.
+///
+/// The leading "0x[0-9a-fA-F]*" (i.e. integer part) has already been consumed
+/// before we get here.
+AsmToken AsmLexer::LexHexFloatLiteral(bool NoIntDigits) {
+ assert((*CurPtr == 'p' || *CurPtr == 'P' || *CurPtr == '.') &&
+ "unexpected parse state in floating hex");
+ bool NoFracDigits = true;
+
+ // Skip the fractional part if there is one
+ if (*CurPtr == '.') {
+ ++CurPtr;
+
+ const char *FracStart = CurPtr;
+ while (isxdigit(*CurPtr))
+ ++CurPtr;
+
+ NoFracDigits = CurPtr == FracStart;
+ }
+
+ if (NoIntDigits && NoFracDigits)
+ return ReturnError(TokStart, "invalid hexadecimal floating-point constant: "
+ "expected at least one significand digit");
+
+ // Make sure we do have some kind of proper exponent part
+ if (*CurPtr != 'p' && *CurPtr != 'P')
+ return ReturnError(TokStart, "invalid hexadecimal floating-point constant: "
+ "expected exponent part 'p'");
+ ++CurPtr;
+
+ if (*CurPtr == '+' || *CurPtr == '-')
+ ++CurPtr;
+
+ // N.b. exponent digits are *not* hex
+ const char *ExpStart = CurPtr;
+ while (isdigit(*CurPtr))
+ ++CurPtr;
+
+ if (CurPtr == ExpStart)
+ return ReturnError(TokStart, "invalid hexadecimal floating-point constant: "
+ "expected at least one exponent digit");
+
+ return AsmToken(AsmToken::Real, StringRef(TokStart, CurPtr - TokStart));
+}
+
+/// LexIdentifier: [a-zA-Z_.][a-zA-Z0-9_$.@?]*
+static bool IsIdentifierChar(char c, bool AllowAt) {
+ return isalnum(c) || c == '_' || c == '$' || c == '.' ||
+ (c == '@' && AllowAt) || c == '?';
}
AsmToken AsmLexer::LexIdentifier() {
// Check for floating point literals.
// Disambiguate a .1243foo identifier from a floating literal.
while (isdigit(*CurPtr))
++CurPtr;
- if (*CurPtr == 'e' || *CurPtr == 'E' || !IsIdentifierChar(*CurPtr))
+ if (*CurPtr == 'e' || *CurPtr == 'E' ||
+ !IsIdentifierChar(*CurPtr, AllowAtInIdentifier))
return LexFloatLiteral();
}
- while (IsIdentifierChar(*CurPtr))
+ while (IsIdentifierChar(*CurPtr, AllowAtInIdentifier))
++CurPtr;
-
+
// Handle . as a special case.
if (CurPtr == TokStart+1 && TokStart[0] == '.')
return AsmToken(AsmToken::Dot, StringRef(TokStart, 1));
-
+
return AsmToken(AsmToken::Identifier, StringRef(TokStart, CurPtr - TokStart));
}
switch (*CurPtr) {
case '*': break; // C style comment.
case '/': return ++CurPtr, LexLineComment();
- default: return AsmToken(AsmToken::Slash, StringRef(CurPtr, 1));
+ default: return AsmToken(AsmToken::Slash, StringRef(CurPtr-1, 1));
}
// C Style comment.
case '*':
// End of the comment?
if (CurPtr[0] != '/') break;
-
+
++CurPtr; // End the */.
return LexToken();
}
// FIXME: This is broken if we happen to a comment at the end of a file, which
// was .included, and which doesn't end with a newline.
int CurChar = getNextChar();
- while (CurChar != '\n' && CurChar != '\n' && CurChar != EOF)
+ while (CurChar != '\n' && CurChar != '\r' && CurChar != EOF)
CurChar = getNextChar();
-
+
if (CurChar == EOF)
return AsmToken(AsmToken::Eof, StringRef(CurPtr, 0));
return AsmToken(AsmToken::EndOfStatement, StringRef(CurPtr, 0));
}
static void SkipIgnoredIntegerSuffix(const char *&CurPtr) {
- if (CurPtr[0] == 'L' && CurPtr[1] == 'L')
- CurPtr += 2;
- if (CurPtr[0] == 'U' && CurPtr[1] == 'L' && CurPtr[2] == 'L')
- CurPtr += 3;
+ // Skip ULL, UL, U, L and LL suffices.
+ if (CurPtr[0] == 'U')
+ ++CurPtr;
+ if (CurPtr[0] == 'L')
+ ++CurPtr;
+ if (CurPtr[0] == 'L')
+ ++CurPtr;
+}
+
+// Look ahead to search for first non-hex digit, if it's [hH], then we treat the
+// integer as a hexadecimal, possibly with leading zeroes.
+static unsigned doLookAhead(const char *&CurPtr, unsigned DefaultRadix) {
+ const char *FirstHex = 0;
+ const char *LookAhead = CurPtr;
+ while (1) {
+ if (isdigit(*LookAhead)) {
+ ++LookAhead;
+ } else if (isxdigit(*LookAhead)) {
+ if (!FirstHex)
+ FirstHex = LookAhead;
+ ++LookAhead;
+ } else {
+ break;
+ }
+ }
+ bool isHex = *LookAhead == 'h' || *LookAhead == 'H';
+ CurPtr = isHex || !FirstHex ? LookAhead : FirstHex;
+ if (isHex)
+ return 16;
+ return DefaultRadix;
}
/// LexDigit: First character is [0-9].
/// Forward/Backward Label: [0-9][fb]
/// Binary integer: 0b[01]+
/// Octal integer: 0[0-7]+
-/// Hex integer: 0x[0-9a-fA-F]+
+/// Hex integer: 0x[0-9a-fA-F]+ or [0x]?[0-9][0-9a-fA-F]*[hH]
/// Decimal integer: [1-9][0-9]*
AsmToken AsmLexer::LexDigit() {
// Decimal integer: [1-9][0-9]*
if (CurPtr[-1] != '0' || CurPtr[0] == '.') {
- while (isdigit(*CurPtr))
- ++CurPtr;
-
+ unsigned Radix = doLookAhead(CurPtr, 10);
+ bool isHex = Radix == 16;
// Check for floating point literals.
- if (*CurPtr == '.' || *CurPtr == 'e') {
+ if (!isHex && (*CurPtr == '.' || *CurPtr == 'e')) {
++CurPtr;
return LexFloatLiteral();
}
StringRef Result(TokStart, CurPtr - TokStart);
long long Value;
- if (Result.getAsInteger(10, Value)) {
- // We have to handle minint_as_a_positive_value specially, because
- // - minint_as_a_positive_value = minint and it is valid.
- if (Result == "9223372036854775808")
- Value = -9223372036854775808ULL;
- else
- return ReturnError(TokStart, "Invalid decimal number");
+ if (Result.getAsInteger(Radix, Value)) {
+ // Allow positive values that are too large to fit into a signed 64-bit
+ // integer, but that do fit in an unsigned one, we just convert them over.
+ unsigned long long UValue;
+ if (Result.getAsInteger(Radix, UValue))
+ return ReturnError(TokStart, !isHex ? "invalid decimal number" :
+ "invalid hexdecimal number");
+ Value = (long long)UValue;
}
-
- // The darwin/x86 (and x86-64) assembler accepts and ignores ULL and LL
- // suffixes on integer literals.
+
+ // Consume the [bB][hH].
+ if (Radix == 2 || Radix == 16)
+ ++CurPtr;
+
+ // The darwin/x86 (and x86-64) assembler accepts and ignores type
+ // suffices on integer literals.
SkipIgnoredIntegerSuffix(CurPtr);
-
+
return AsmToken(AsmToken::Integer, Result, Value);
}
-
+
if (*CurPtr == 'b') {
++CurPtr;
// See if we actually have "0b" as part of something like "jmp 0b\n"
const char *NumStart = CurPtr;
while (CurPtr[0] == '0' || CurPtr[0] == '1')
++CurPtr;
-
+
// Requires at least one binary digit.
if (CurPtr == NumStart)
- return ReturnError(TokStart, "Invalid binary number");
-
+ return ReturnError(TokStart, "invalid binary number");
+
StringRef Result(TokStart, CurPtr - TokStart);
-
+
long long Value;
if (Result.substr(2).getAsInteger(2, Value))
- return ReturnError(TokStart, "Invalid binary number");
-
+ return ReturnError(TokStart, "invalid binary number");
+
// The darwin/x86 (and x86-64) assembler accepts and ignores ULL and LL
// suffixes on integer literals.
SkipIgnoredIntegerSuffix(CurPtr);
-
+
return AsmToken(AsmToken::Integer, Result, Value);
}
-
+
if (*CurPtr == 'x') {
++CurPtr;
const char *NumStart = CurPtr;
while (isxdigit(CurPtr[0]))
++CurPtr;
-
- // Requires at least one hex digit.
+
+ // "0x.0p0" is valid, and "0x0p0" (but not "0xp0" for example, which will be
+ // diagnosed by LexHexFloatLiteral).
+ if (CurPtr[0] == '.' || CurPtr[0] == 'p' || CurPtr[0] == 'P')
+ return LexHexFloatLiteral(NumStart == CurPtr);
+
+ // Otherwise requires at least one hex digit.
if (CurPtr == NumStart)
- return ReturnError(CurPtr-2, "Invalid hexadecimal number");
+ return ReturnError(CurPtr-2, "invalid hexadecimal number");
unsigned long long Result;
if (StringRef(TokStart, CurPtr - TokStart).getAsInteger(0, Result))
- return ReturnError(TokStart, "Invalid hexadecimal number");
-
+ return ReturnError(TokStart, "invalid hexadecimal number");
+
+ // Consume the optional [hH].
+ if (*CurPtr == 'h' || *CurPtr == 'H')
+ ++CurPtr;
+
// The darwin/x86 (and x86-64) assembler accepts and ignores ULL and LL
// suffixes on integer literals.
SkipIgnoredIntegerSuffix(CurPtr);
-
+
return AsmToken(AsmToken::Integer, StringRef(TokStart, CurPtr - TokStart),
(int64_t)Result);
}
-
- // Must be an octal number, it starts with 0.
- while (*CurPtr >= '0' && *CurPtr <= '7')
- ++CurPtr;
-
- StringRef Result(TokStart, CurPtr - TokStart);
+
+ // Either octal or hexadecimal.
long long Value;
- if (Result.getAsInteger(8, Value))
- return ReturnError(TokStart, "Invalid octal number");
-
+ unsigned Radix = doLookAhead(CurPtr, 8);
+ bool isHex = Radix == 16;
+ StringRef Result(TokStart, CurPtr - TokStart);
+ if (Result.getAsInteger(Radix, Value))
+ return ReturnError(TokStart, !isHex ? "invalid octal number" :
+ "invalid hexdecimal number");
+
+ // Consume the [hH].
+ if (Radix == 16)
+ ++CurPtr;
+
// The darwin/x86 (and x86-64) assembler accepts and ignores ULL and LL
// suffixes on integer literals.
SkipIgnoredIntegerSuffix(CurPtr);
-
+
return AsmToken(AsmToken::Integer, Result, Value);
}
+/// LexSingleQuote: Integer: 'b'
+AsmToken AsmLexer::LexSingleQuote() {
+ int CurChar = getNextChar();
+
+ if (CurChar == '\\')
+ CurChar = getNextChar();
+
+ if (CurChar == EOF)
+ return ReturnError(TokStart, "unterminated single quote");
+
+ CurChar = getNextChar();
+
+ if (CurChar != '\'')
+ return ReturnError(TokStart, "single quote way too long");
+
+ // The idea here being that 'c' is basically just an integral
+ // constant.
+ StringRef Res = StringRef(TokStart,CurPtr - TokStart);
+ long long Value;
+
+ if (Res.startswith("\'\\")) {
+ char theChar = Res[2];
+ switch (theChar) {
+ default: Value = theChar; break;
+ case '\'': Value = '\''; break;
+ case 't': Value = '\t'; break;
+ case 'n': Value = '\n'; break;
+ case 'b': Value = '\b'; break;
+ }
+ } else
+ Value = TokStart[1];
+
+ return AsmToken(AsmToken::Integer, Res, Value);
+}
+
+
/// LexQuote: String: "..."
AsmToken AsmLexer::LexQuote() {
int CurChar = getNextChar();
// Allow \", etc.
CurChar = getNextChar();
}
-
+
if (CurChar == EOF)
return ReturnError(TokStart, "unterminated string constant");
CurChar = getNextChar();
}
-
+
return AsmToken(AsmToken::String, StringRef(TokStart, CurPtr - TokStart));
}
StringRef AsmLexer::LexUntilEndOfStatement() {
TokStart = CurPtr;
- while (!isAtStartOfComment(*CurPtr) && // Start of line comment.
- *CurPtr != ';' && // End of statement marker.
+ while (!isAtStartOfComment(*CurPtr) && // Start of line comment.
+ !isAtStatementSeparator(CurPtr) && // End of statement marker.
*CurPtr != '\n' &&
*CurPtr != '\r' &&
(*CurPtr != 0 || CurPtr != CurBuf->getBufferEnd())) {
return StringRef(TokStart, CurPtr-TokStart);
}
+StringRef AsmLexer::LexUntilEndOfLine() {
+ TokStart = CurPtr;
+
+ while (*CurPtr != '\n' &&
+ *CurPtr != '\r' &&
+ (*CurPtr != 0 || CurPtr != CurBuf->getBufferEnd())) {
+ ++CurPtr;
+ }
+ return StringRef(TokStart, CurPtr-TokStart);
+}
+
bool AsmLexer::isAtStartOfComment(char Char) {
// FIXME: This won't work for multi-character comment indicators like "//".
return Char == *MAI.getCommentString();
}
+bool AsmLexer::isAtStatementSeparator(const char *Ptr) {
+ return strncmp(Ptr, MAI.getSeparatorString(),
+ strlen(MAI.getSeparatorString())) == 0;
+}
+
AsmToken AsmLexer::LexToken() {
TokStart = CurPtr;
// This always consumes at least one character.
int CurChar = getNextChar();
-
- if (isAtStartOfComment(CurChar))
+
+ if (isAtStartOfComment(CurChar)) {
+ // If this comment starts with a '#', then return the Hash token and let
+ // the assembler parser see if it can be parsed as a cpp line filename
+ // comment. We do this only if we are at the start of a line.
+ if (CurChar == '#' && isAtStartOfLine)
+ return AsmToken(AsmToken::Hash, StringRef(TokStart, 1));
+ isAtStartOfLine = true;
return LexLineComment();
+ }
+ if (isAtStatementSeparator(TokStart)) {
+ CurPtr += strlen(MAI.getSeparatorString()) - 1;
+ return AsmToken(AsmToken::EndOfStatement,
+ StringRef(TokStart, strlen(MAI.getSeparatorString())));
+ }
+ // If we're missing a newline at EOF, make sure we still get an
+ // EndOfStatement token before the Eof token.
+ if (CurChar == EOF && !isAtStartOfLine) {
+ isAtStartOfLine = true;
+ return AsmToken(AsmToken::EndOfStatement, StringRef(TokStart, 1));
+ }
+
+ isAtStartOfLine = false;
switch (CurChar) {
default:
// Handle identifier: [a-zA-Z_.][a-zA-Z0-9_$.@]*
if (isalpha(CurChar) || CurChar == '_' || CurChar == '.')
return LexIdentifier();
-
+
// Unknown character, emit an error.
return ReturnError(TokStart, "invalid character in input");
case EOF: return AsmToken(AsmToken::Eof, StringRef(TokStart, 0));
case 0:
case ' ':
case '\t':
- // Ignore whitespace.
- return LexToken();
+ if (SkipSpace) {
+ // Ignore whitespace.
+ return LexToken();
+ } else {
+ int len = 1;
+ while (*CurPtr==' ' || *CurPtr=='\t') {
+ CurPtr++;
+ len++;
+ }
+ return AsmToken(AsmToken::Space, StringRef(TokStart, len));
+ }
case '\n': // FALL THROUGH.
- case '\r': // FALL THROUGH.
- case ';': return AsmToken(AsmToken::EndOfStatement, StringRef(TokStart, 1));
+ case '\r':
+ isAtStartOfLine = true;
+ return AsmToken(AsmToken::EndOfStatement, StringRef(TokStart, 1));
case ':': return AsmToken(AsmToken::Colon, StringRef(TokStart, 1));
case '+': return AsmToken(AsmToken::Plus, StringRef(TokStart, 1));
case '-': return AsmToken(AsmToken::Minus, StringRef(TokStart, 1));
case ',': return AsmToken(AsmToken::Comma, StringRef(TokStart, 1));
case '$': return AsmToken(AsmToken::Dollar, StringRef(TokStart, 1));
case '@': return AsmToken(AsmToken::At, StringRef(TokStart, 1));
- case '=':
+ case '\\': return AsmToken(AsmToken::BackSlash, StringRef(TokStart, 1));
+ case '=':
if (*CurPtr == '=')
return ++CurPtr, AsmToken(AsmToken::EqualEqual, StringRef(TokStart, 2));
return AsmToken(AsmToken::Equal, StringRef(TokStart, 1));
- case '|':
+ case '|':
if (*CurPtr == '|')
return ++CurPtr, AsmToken(AsmToken::PipePipe, StringRef(TokStart, 2));
return AsmToken(AsmToken::Pipe, StringRef(TokStart, 1));
case '^': return AsmToken(AsmToken::Caret, StringRef(TokStart, 1));
- case '&':
+ case '&':
if (*CurPtr == '&')
return ++CurPtr, AsmToken(AsmToken::AmpAmp, StringRef(TokStart, 2));
return AsmToken(AsmToken::Amp, StringRef(TokStart, 1));
- case '!':
+ case '!':
if (*CurPtr == '=')
return ++CurPtr, AsmToken(AsmToken::ExclaimEqual, StringRef(TokStart, 2));
return AsmToken(AsmToken::Exclaim, StringRef(TokStart, 1));
case '%': return AsmToken(AsmToken::Percent, StringRef(TokStart, 1));
case '/': return LexSlash();
case '#': return AsmToken(AsmToken::Hash, StringRef(TokStart, 1));
+ case '\'': return LexSingleQuote();
case '"': return LexQuote();
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return LexDigit();
case '<':
switch (*CurPtr) {
- case '<': return ++CurPtr, AsmToken(AsmToken::LessLess,
+ case '<': return ++CurPtr, AsmToken(AsmToken::LessLess,
StringRef(TokStart, 2));
- case '=': return ++CurPtr, AsmToken(AsmToken::LessEqual,
+ case '=': return ++CurPtr, AsmToken(AsmToken::LessEqual,
StringRef(TokStart, 2));
- case '>': return ++CurPtr, AsmToken(AsmToken::LessGreater,
+ case '>': return ++CurPtr, AsmToken(AsmToken::LessGreater,
StringRef(TokStart, 2));
default: return AsmToken(AsmToken::Less, StringRef(TokStart, 1));
}
case '>':
switch (*CurPtr) {
- case '>': return ++CurPtr, AsmToken(AsmToken::GreaterGreater,
+ case '>': return ++CurPtr, AsmToken(AsmToken::GreaterGreater,
StringRef(TokStart, 2));
- case '=': return ++CurPtr, AsmToken(AsmToken::GreaterEqual,
+ case '=': return ++CurPtr, AsmToken(AsmToken::GreaterEqual,
StringRef(TokStart, 2));
default: return AsmToken(AsmToken::Greater, StringRef(TokStart, 1));
}
-
+
// TODO: Quoted identifiers (objc methods etc)
// local labels: [0-9][:]
// Forward/backward labels: [0-9][fb]
projects / oota-llvm.git / blobdiff