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llvm-mc: Factor AsmToken class out of AsmLexer.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77292 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2009-07-28 03:00:54 +00:00
parent d6aa02de10
commit cb358b63a7
2 changed files with 108 additions and 83 deletions
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119
tools/llvm-mc/AsmLexer.cpp
View File

@ -20,10 +20,11 @@
#include <cstdlib>
using namespace llvm;
AsmLexer::AsmLexer(SourceMgr &SM) : SrcMgr(SM) {
AsmLexer::AsmLexer(SourceMgr &SM) : SrcMgr(SM) {
CurBuffer = 0;
CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
CurPtr = CurBuf->getBufferStart();
CurTok = AsmToken(asmtok::Error, StringRef(CurPtr, 0));
TokStart = 0;
}
@ -41,9 +42,9 @@ void AsmLexer::PrintMessage(SMLoc Loc, const std::string &Msg,
/// ReturnError - Set the error to the specified string at the specified
/// location. This is defined to always return asmtok::Error.
asmtok::TokKind AsmLexer::ReturnError(const char *Loc, const std::string &Msg) {
AsmToken AsmLexer::ReturnError(const char *Loc, const std::string &Msg) {
SrcMgr.PrintMessage(SMLoc::getFromPointer(Loc), Msg, "error");
return asmtok::Error;
return AsmToken(asmtok::Error, StringRef(Loc, 0));
}
/// EnterIncludeFile - Enter the specified file. This prints an error and
@ -94,35 +95,31 @@ int AsmLexer::getNextChar() {
}
/// LexIdentifier: [a-zA-Z_.][a-zA-Z0-9_$.@]*
asmtok::TokKind AsmLexer::LexIdentifier() {
AsmToken AsmLexer::LexIdentifier() {
while (isalnum(*CurPtr) || *CurPtr == '_' || *CurPtr == '$' ||
*CurPtr == '.' || *CurPtr == '@')
++CurPtr;
// Unique string.
CurStrVal = StringRef(TokStart, CurPtr - TokStart);
return asmtok::Identifier;
return AsmToken(asmtok::Identifier, StringRef(TokStart, CurPtr - TokStart));
}
/// LexPercent: Register: %[a-zA-Z0-9]+
asmtok::TokKind AsmLexer::LexPercent() {
AsmToken AsmLexer::LexPercent() {
if (!isalnum(*CurPtr))
return asmtok::Percent; // Single %.
return AsmToken(asmtok::Percent, StringRef(CurPtr, 1)); // Single %.
while (isalnum(*CurPtr))
++CurPtr;
// Unique string.
CurStrVal = StringRef(TokStart, CurPtr - TokStart);
return asmtok::Register;
return AsmToken(asmtok::Register, StringRef(TokStart, CurPtr - TokStart));
}
/// LexSlash: Slash: /
/// C-Style Comment: /* ... */
asmtok::TokKind AsmLexer::LexSlash() {
AsmToken AsmLexer::LexSlash() {
switch (*CurPtr) {
case '*': break; // C style comment.
case '/': return ++CurPtr, LexLineComment();
default: return asmtok::Slash;
default: return AsmToken(asmtok::Slash, StringRef(CurPtr, 1));
}
// C Style comment.
@ -144,14 +141,16 @@ asmtok::TokKind AsmLexer::LexSlash() {
/// LexLineComment: Comment: #[^\n]*
/// : //[^\n]*
asmtok::TokKind AsmLexer::LexLineComment() {
AsmToken AsmLexer::LexLineComment() {
// 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)
CurChar = getNextChar();
if (CurChar == EOF)
return asmtok::Eof;
return asmtok::EndOfStatement;
return AsmToken(asmtok::Eof, StringRef(CurPtr, 0));
return AsmToken(asmtok::EndOfStatement, StringRef(CurPtr, 0));
}
@ -163,7 +162,7 @@ asmtok::TokKind AsmLexer::LexLineComment() {
/// Hex integer: 0x[0-9a-fA-F]+
/// Decimal integer: [1-9][0-9]*
/// TODO: FP literal.
asmtok::TokKind AsmLexer::LexDigit() {
AsmToken AsmLexer::LexDigit() {
if (*CurPtr == ':')
return ReturnError(TokStart, "FIXME: local label not implemented");
if (*CurPtr == 'f' || *CurPtr == 'b')
@ -173,8 +172,8 @@ asmtok::TokKind AsmLexer::LexDigit() {
if (CurPtr[-1] != '0') {
while (isdigit(*CurPtr))
++CurPtr;
CurIntVal = strtoll(TokStart, 0, 10);
return asmtok::IntVal;
return AsmToken(asmtok::IntVal, StringRef(TokStart, CurPtr - TokStart),
strtoll(TokStart, 0, 10));
}
if (*CurPtr == 'b') {
@ -186,8 +185,8 @@ asmtok::TokKind AsmLexer::LexDigit() {
// Requires at least one binary digit.
if (CurPtr == NumStart)
return ReturnError(CurPtr-2, "Invalid binary number");
CurIntVal = strtoll(NumStart, 0, 2);
return asmtok::IntVal;
return AsmToken(asmtok::IntVal, StringRef(TokStart, CurPtr - TokStart),
strtoll(NumStart, 0, 2));
}
if (*CurPtr == 'x') {
@ -201,29 +200,28 @@ asmtok::TokKind AsmLexer::LexDigit() {
return ReturnError(CurPtr-2, "Invalid hexadecimal number");
errno = 0;
CurIntVal = strtoll(NumStart, 0, 16);
if (errno == EINVAL)
return ReturnError(CurPtr-2, "Invalid hexadecimal number");
if (errno == ERANGE) {
errno = 0;
CurIntVal = (int64_t)strtoull(NumStart, 0, 16);
if (errno == EINVAL)
return ReturnError(CurPtr-2, "Invalid hexadecimal number");
if (errno == ERANGE)
return ReturnError(CurPtr-2, "Hexadecimal number out of range");
}
return asmtok::IntVal;
return AsmToken(asmtok::IntVal, StringRef(TokStart, CurPtr - TokStart),
(int64_t) strtoull(NumStart, 0, 16));
}
// Must be an octal number, it starts with 0.
while (*CurPtr >= '0' && *CurPtr <= '7')
++CurPtr;
CurIntVal = strtoll(TokStart, 0, 8);
return asmtok::IntVal;
return AsmToken(asmtok::IntVal, StringRef(TokStart, CurPtr - TokStart),
strtoll(TokStart, 0, 8));
}
/// LexQuote: String: "..."
asmtok::TokKind AsmLexer::LexQuote() {
AsmToken AsmLexer::LexQuote() {
int CurChar = getNextChar();
// TODO: does gas allow multiline string constants?
while (CurChar != '"') {
@ -238,13 +236,11 @@ asmtok::TokKind AsmLexer::LexQuote() {
CurChar = getNextChar();
}
// Unique string, include quotes for now.
CurStrVal = StringRef(TokStart, CurPtr - TokStart);
return asmtok::String;
return AsmToken(asmtok::String, StringRef(TokStart, CurPtr - TokStart));
}
asmtok::TokKind AsmLexer::LexToken() {
AsmToken AsmLexer::LexToken() {
TokStart = CurPtr;
// This always consumes at least one character.
int CurChar = getNextChar();
@ -257,7 +253,7 @@ asmtok::TokKind AsmLexer::LexToken() {
// Unknown character, emit an error.
return ReturnError(TokStart, "invalid character in input");
case EOF: return asmtok::Eof;
case EOF: return AsmToken(asmtok::Eof, StringRef(TokStart, 0));
case 0:
case ' ':
case '\t':
@ -265,33 +261,33 @@ asmtok::TokKind AsmLexer::LexToken() {
return LexToken();
case '\n': // FALL THROUGH.
case '\r': // FALL THROUGH.
case ';': return asmtok::EndOfStatement;
case ':': return asmtok::Colon;
case '+': return asmtok::Plus;
case '-': return asmtok::Minus;
case '~': return asmtok::Tilde;
case '(': return asmtok::LParen;
case ')': return asmtok::RParen;
case '*': return asmtok::Star;
case ',': return asmtok::Comma;
case '$': return asmtok::Dollar;
case ';': return AsmToken(asmtok::EndOfStatement, StringRef(TokStart, 1));
case ':': return AsmToken(asmtok::Colon, StringRef(TokStart, 1));
case '+': return AsmToken(asmtok::Plus, StringRef(TokStart, 1));
case '-': return AsmToken(asmtok::Minus, StringRef(TokStart, 1));
case '~': return AsmToken(asmtok::Tilde, StringRef(TokStart, 1));
case '(': return AsmToken(asmtok::LParen, StringRef(TokStart, 1));
case ')': return AsmToken(asmtok::RParen, StringRef(TokStart, 1));
case '*': return AsmToken(asmtok::Star, StringRef(TokStart, 1));
case ',': return AsmToken(asmtok::Comma, StringRef(TokStart, 1));
case '$': return AsmToken(asmtok::Dollar, StringRef(TokStart, 1));
case '=':
if (*CurPtr == '=')
return ++CurPtr, asmtok::EqualEqual;
return asmtok::Equal;
return ++CurPtr, AsmToken(asmtok::EqualEqual, StringRef(TokStart, 2));
return AsmToken(asmtok::Equal, StringRef(TokStart, 1));
case '|':
if (*CurPtr == '|')
return ++CurPtr, asmtok::PipePipe;
return asmtok::Pipe;
case '^': return asmtok::Caret;
return ++CurPtr, AsmToken(asmtok::PipePipe, StringRef(TokStart, 2));
return AsmToken(asmtok::Pipe, StringRef(TokStart, 1));
case '^': return AsmToken(asmtok::Caret, StringRef(TokStart, 1));
case '&':
if (*CurPtr == '&')
return ++CurPtr, asmtok::AmpAmp;
return asmtok::Amp;
return ++CurPtr, AsmToken(asmtok::AmpAmp, StringRef(TokStart, 2));
return AsmToken(asmtok::Amp, StringRef(TokStart, 1));
case '!':
if (*CurPtr == '=')
return ++CurPtr, asmtok::ExclaimEqual;
return asmtok::Exclaim;
return ++CurPtr, AsmToken(asmtok::ExclaimEqual, StringRef(TokStart, 2));
return AsmToken(asmtok::Exclaim, StringRef(TokStart, 1));
case '%': return LexPercent();
case '/': return LexSlash();
case '#': return LexLineComment();
@ -301,16 +297,21 @@ asmtok::TokKind AsmLexer::LexToken() {
return LexDigit();
case '<':
switch (*CurPtr) {
case '<': return ++CurPtr, asmtok::LessLess;
case '=': return ++CurPtr, asmtok::LessEqual;
case '>': return ++CurPtr, asmtok::LessGreater;
default: return asmtok::Less;
case '<': return ++CurPtr, AsmToken(asmtok::LessLess,
StringRef(TokStart, 2));
case '=': return ++CurPtr, AsmToken(asmtok::LessEqual,
StringRef(TokStart, 2));
case '>': return ++CurPtr, AsmToken(asmtok::LessGreater,
StringRef(TokStart, 2));
default: return AsmToken(asmtok::Less, StringRef(TokStart, 1));
}
case '>':
switch (*CurPtr) {
case '>': return ++CurPtr, asmtok::GreaterGreater;
case '=': return ++CurPtr, asmtok::GreaterEqual;
default: return asmtok::Greater;
case '>': return ++CurPtr, AsmToken(asmtok::GreaterGreater,
StringRef(TokStart, 2));
case '=': return ++CurPtr, AsmToken(asmtok::GreaterEqual,
StringRef(TokStart, 2));
default: return AsmToken(asmtok::Greater, StringRef(TokStart, 1));
}
// TODO: Quoted identifiers (objc methods etc)

72
tools/llvm-mc/AsmLexer.h
View File

@ -53,6 +53,35 @@ namespace asmtok {
};
}
/// AsmToken - Target independent representation for an assembler token.
struct AsmToken {
asmtok::TokKind Kind;
/// A reference to the entire token contents; this is always a pointer into
/// a memory buffer owned by the source manager.
StringRef Str;
int64_t IntVal;
public:
AsmToken() {}
AsmToken(asmtok::TokKind _Kind, const StringRef &_Str, int64_t _IntVal = 0)
: Kind(_Kind), Str(_Str), IntVal(_IntVal) {}
asmtok::TokKind getKind() const { return Kind; }
bool is(asmtok::TokKind K) const { return Kind == K; }
bool isNot(asmtok::TokKind K) const { return Kind != K; }
SMLoc getLoc() const;
StringRef getString() const { return Str; }
int64_t getIntVal() const {
assert(Kind == asmtok::IntVal && "This token isn't an integer");
return IntVal;
}
};
/// AsmLexer - Lexer class for assembly files.
class AsmLexer : public MCAsmLexer {
SourceMgr &SrcMgr;
@ -60,14 +89,13 @@ class AsmLexer : public MCAsmLexer {
const char *CurPtr;
const MemoryBuffer *CurBuf;
// Information about the current token.
const char *TokStart;
asmtok::TokKind CurKind;
StringRef CurStrVal; // This is valid for Identifier.
int64_t CurIntVal;
/// The current token.
AsmToken CurTok;
/// CurBuffer - This is the current buffer index we're lexing from as managed
/// by the SourceMgr object.
/// This is the current buffer index we're lexing from as managed by the
/// SourceMgr object.
int CurBuffer;
void operator=(const AsmLexer&); // DO NOT IMPLEMENT
@ -77,12 +105,12 @@ public:
~AsmLexer();
asmtok::TokKind Lex() {
return CurKind = LexToken();
return CurTok = LexToken(), getKind();
}
asmtok::TokKind getKind() const { return CurKind; }
bool is(asmtok::TokKind K) const { return CurKind == K; }
bool isNot(asmtok::TokKind K) const { return CurKind != K; }
asmtok::TokKind getKind() const { return CurTok.getKind(); }
bool is(asmtok::TokKind K) const { return CurTok.is(K); }
bool isNot(asmtok::TokKind K) const { return CurTok.isNot(K); }
/// getCurStrVal - Get the string for the current token, this includes all
/// characters (for example, the quotes on strings) in the token.
@ -90,14 +118,10 @@ public:
/// The returned StringRef points into the source manager's memory buffer, and
/// is safe to store across calls to Lex().
StringRef getCurStrVal() const {
assert((CurKind == asmtok::Identifier || CurKind == asmtok::Register ||
CurKind == asmtok::String) &&
"This token doesn't have a string value");
return CurStrVal;
return CurTok.getString();
}
int64_t getCurIntVal() const {
assert(CurKind == asmtok::IntVal && "This token isn't an integer");
return CurIntVal;
return CurTok.getIntVal();
}
SMLoc getLoc() const;
@ -109,16 +133,16 @@ public:
private:
int getNextChar();
asmtok::TokKind ReturnError(const char *Loc, const std::string &Msg);
AsmToken ReturnError(const char *Loc, const std::string &Msg);
/// LexToken - Read the next token and return its code.
asmtok::TokKind LexToken();
asmtok::TokKind LexIdentifier();
asmtok::TokKind LexPercent();
asmtok::TokKind LexSlash();
asmtok::TokKind LexLineComment();
asmtok::TokKind LexDigit();
asmtok::TokKind LexQuote();
AsmToken LexToken();
AsmToken LexIdentifier();
AsmToken LexPercent();
AsmToken LexSlash();
AsmToken LexLineComment();
AsmToken LexDigit();
AsmToken LexQuote();
};
} // end namespace llvm