From 7b3392326c40c3c20697816acae597ba7b3144eb Mon Sep 17 00:00:00 2001
From: dim <dim@FreeBSD.org>
Date: Thu, 20 Oct 2011 21:10:27 +0000
Subject: Vendor import of llvm release_30 branch r142614:
http://llvm.org/svn/llvm-project/llvm/branches/release_30@142614
---
lib/TableGen/TGLexer.cpp | 435 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 435 insertions(+)
create mode 100644 lib/TableGen/TGLexer.cpp
(limited to 'lib/TableGen/TGLexer.cpp')
diff --git a/lib/TableGen/TGLexer.cpp b/lib/TableGen/TGLexer.cpp
new file mode 100644
index 0000000..8c1b429
--- /dev/null
+++ b/lib/TableGen/TGLexer.cpp
@@ -0,0 +1,435 @@
+//===- TGLexer.cpp - Lexer for TableGen -----------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Implement the Lexer for TableGen.
+//
+//===----------------------------------------------------------------------===//
+
+#include "TGLexer.h"
+#include "llvm/TableGen/Error.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Config/config.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/Twine.h"
+#include <cctype>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <cerrno>
+using namespace llvm;
+
+TGLexer::TGLexer(SourceMgr &SM) : SrcMgr(SM) {
+ CurBuffer = 0;
+ CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
+ CurPtr = CurBuf->getBufferStart();
+ TokStart = 0;
+}
+
+SMLoc TGLexer::getLoc() const {
+ return SMLoc::getFromPointer(TokStart);
+}
+
+/// ReturnError - Set the error to the specified string at the specified
+/// location. This is defined to always return tgtok::Error.
+tgtok::TokKind TGLexer::ReturnError(const char *Loc, const Twine &Msg) {
+ PrintError(Loc, Msg);
+ return tgtok::Error;
+}
+
+int TGLexer::getNextChar() {
+ char CurChar = *CurPtr++;
+ switch (CurChar) {
+ default:
+ return (unsigned char)CurChar;
+ case 0: {
+ // A nul character in the stream is either the end of the current buffer or
+ // a random nul in the file. Disambiguate that here.
+ if (CurPtr-1 != CurBuf->getBufferEnd())
+ return 0; // Just whitespace.
+
+ // If this is the end of an included file, pop the parent file off the
+ // include stack.
+ SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
+ if (ParentIncludeLoc != SMLoc()) {
+ CurBuffer = SrcMgr.FindBufferContainingLoc(ParentIncludeLoc);
+ CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
+ CurPtr = ParentIncludeLoc.getPointer();
+ return getNextChar();
+ }
+
+ // Otherwise, return end of file.
+ --CurPtr; // Another call to lex will return EOF again.
+ return EOF;
+ }
+ case '\n':
+ case '\r':
+ // Handle the newline character by ignoring it and incrementing the line
+ // count. However, be careful about 'dos style' files with \n\r in them.
+ // Only treat a \n\r or \r\n as a single line.
+ if ((*CurPtr == '\n' || (*CurPtr == '\r')) &&
+ *CurPtr != CurChar)
+ ++CurPtr; // Eat the two char newline sequence.
+ return '\n';
+ }
+}
+
+tgtok::TokKind TGLexer::LexToken() {
+ TokStart = CurPtr;
+ // This always consumes at least one character.
+ int CurChar = getNextChar();
+
+ switch (CurChar) {
+ default:
+ // Handle letters: [a-zA-Z_#]
+ if (isalpha(CurChar) || CurChar == '_' || CurChar == '#')
+ return LexIdentifier();
+
+ // Unknown character, emit an error.
+ return ReturnError(TokStart, "Unexpected character");
+ case EOF: return tgtok::Eof;
+ case ':': return tgtok::colon;
+ case ';': return tgtok::semi;
+ case '.': return tgtok::period;
+ case ',': return tgtok::comma;
+ case '<': return tgtok::less;
+ case '>': return tgtok::greater;
+ case ']': return tgtok::r_square;
+ case '{': return tgtok::l_brace;
+ case '}': return tgtok::r_brace;
+ case '(': return tgtok::l_paren;
+ case ')': return tgtok::r_paren;
+ case '=': return tgtok::equal;
+ case '?': return tgtok::question;
+
+ case 0:
+ case ' ':
+ case '\t':
+ case '\n':
+ case '\r':
+ // Ignore whitespace.
+ return LexToken();
+ case '/':
+ // If this is the start of a // comment, skip until the end of the line or
+ // the end of the buffer.
+ if (*CurPtr == '/')
+ SkipBCPLComment();
+ else if (*CurPtr == '*') {
+ if (SkipCComment())
+ return tgtok::Error;
+ } else // Otherwise, this is an error.
+ return ReturnError(TokStart, "Unexpected character");
+ return LexToken();
+ case '-': case '+':
+ case '0': case '1': case '2': case '3': case '4': case '5': case '6':
+ case '7': case '8': case '9':
+ return LexNumber();
+ case '"': return LexString();
+ case '$': return LexVarName();
+ case '[': return LexBracket();
+ case '!': return LexExclaim();
+ }
+}
+
+/// LexString - Lex "[^"]*"
+tgtok::TokKind TGLexer::LexString() {
+ const char *StrStart = CurPtr;
+
+ CurStrVal = "";
+
+ while (*CurPtr != '"') {
+ // If we hit the end of the buffer, report an error.
+ if (*CurPtr == 0 && CurPtr == CurBuf->getBufferEnd())
+ return ReturnError(StrStart, "End of file in string literal");
+
+ if (*CurPtr == '\n' || *CurPtr == '\r')
+ return ReturnError(StrStart, "End of line in string literal");
+
+ if (*CurPtr != '\\') {
+ CurStrVal += *CurPtr++;
+ continue;
+ }
+
+ ++CurPtr;
+
+ switch (*CurPtr) {
+ case '\\': case '\'': case '"':
+ // These turn into their literal character.
+ CurStrVal += *CurPtr++;
+ break;
+ case 't':
+ CurStrVal += '\t';
+ ++CurPtr;
+ break;
+ case 'n':
+ CurStrVal += '\n';
+ ++CurPtr;
+ break;
+
+ case '\n':
+ case '\r':
+ return ReturnError(CurPtr, "escaped newlines not supported in tblgen");
+
+ // If we hit the end of the buffer, report an error.
+ case '\0':
+ if (CurPtr == CurBuf->getBufferEnd())
+ return ReturnError(StrStart, "End of file in string literal");
+ // FALL THROUGH
+ default:
+ return ReturnError(CurPtr, "invalid escape in string literal");
+ }
+ }
+
+ ++CurPtr;
+ return tgtok::StrVal;
+}
+
+tgtok::TokKind TGLexer::LexVarName() {
+ if (!isalpha(CurPtr[0]) && CurPtr[0] != '_')
+ return ReturnError(TokStart, "Invalid variable name");
+
+ // Otherwise, we're ok, consume the rest of the characters.
+ const char *VarNameStart = CurPtr++;
+
+ while (isalpha(*CurPtr) || isdigit(*CurPtr) || *CurPtr == '_')
+ ++CurPtr;
+
+ CurStrVal.assign(VarNameStart, CurPtr);
+ return tgtok::VarName;
+}
+
+
+tgtok::TokKind TGLexer::LexIdentifier() {
+ // The first letter is [a-zA-Z_#].
+ const char *IdentStart = TokStart;
+
+ // Match the rest of the identifier regex: [0-9a-zA-Z_#]*
+ while (isalpha(*CurPtr) || isdigit(*CurPtr) || *CurPtr == '_' ||
+ *CurPtr == '#')
+ ++CurPtr;
+
+ // Check to see if this identifier is a keyword.
+ StringRef Str(IdentStart, CurPtr-IdentStart);
+
+ if (Str == "include") {
+ if (LexInclude()) return tgtok::Error;
+ return Lex();
+ }
+
+ tgtok::TokKind Kind = StringSwitch<tgtok::TokKind>(Str)
+ .Case("int", tgtok::Int)
+ .Case("bit", tgtok::Bit)
+ .Case("bits", tgtok::Bits)
+ .Case("string", tgtok::String)
+ .Case("list", tgtok::List)
+ .Case("code", tgtok::Code)
+ .Case("dag", tgtok::Dag)
+ .Case("class", tgtok::Class)
+ .Case("def", tgtok::Def)
+ .Case("defm", tgtok::Defm)
+ .Case("multiclass", tgtok::MultiClass)
+ .Case("field", tgtok::Field)
+ .Case("let", tgtok::Let)
+ .Case("in", tgtok::In)
+ .Default(tgtok::Id);
+
+ if (Kind == tgtok::Id)
+ CurStrVal.assign(Str.begin(), Str.end());
+ return Kind;
+}
+
+/// LexInclude - We just read the "include" token. Get the string token that
+/// comes next and enter the include.
+bool TGLexer::LexInclude() {
+ // The token after the include must be a string.
+ tgtok::TokKind Tok = LexToken();
+ if (Tok == tgtok::Error) return true;
+ if (Tok != tgtok::StrVal) {
+ PrintError(getLoc(), "Expected filename after include");
+ return true;
+ }
+
+ // Get the string.
+ std::string Filename = CurStrVal;
+ std::string IncludedFile;
+
+
+ CurBuffer = SrcMgr.AddIncludeFile(Filename, SMLoc::getFromPointer(CurPtr),
+ IncludedFile);
+ if (CurBuffer == -1) {
+ PrintError(getLoc(), "Could not find include file '" + Filename + "'");
+ return true;
+ }
+
+ Dependencies.push_back(IncludedFile);
+ // Save the line number and lex buffer of the includer.
+ CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
+ CurPtr = CurBuf->getBufferStart();
+ return false;
+}
+
+void TGLexer::SkipBCPLComment() {
+ ++CurPtr; // skip the second slash.
+ while (1) {
+ switch (*CurPtr) {
+ case '\n':
+ case '\r':
+ return; // Newline is end of comment.
+ case 0:
+ // If this is the end of the buffer, end the comment.
+ if (CurPtr == CurBuf->getBufferEnd())
+ return;
+ break;
+ }
+ // Otherwise, skip the character.
+ ++CurPtr;
+ }
+}
+
+/// SkipCComment - This skips C-style /**/ comments. The only difference from C
+/// is that we allow nesting.
+bool TGLexer::SkipCComment() {
+ ++CurPtr; // skip the star.
+ unsigned CommentDepth = 1;
+
+ while (1) {
+ int CurChar = getNextChar();
+ switch (CurChar) {
+ case EOF:
+ PrintError(TokStart, "Unterminated comment!");
+ return true;
+ case '*':
+ // End of the comment?
+ if (CurPtr[0] != '/') break;
+
+ ++CurPtr; // End the */.
+ if (--CommentDepth == 0)
+ return false;
+ break;
+ case '/':
+ // Start of a nested comment?
+ if (CurPtr[0] != '*') break;
+ ++CurPtr;
+ ++CommentDepth;
+ break;
+ }
+ }
+}
+
+/// LexNumber - Lex:
+/// [-+]?[0-9]+
+/// 0x[0-9a-fA-F]+
+/// 0b[01]+
+tgtok::TokKind TGLexer::LexNumber() {
+ if (CurPtr[-1] == '0') {
+ if (CurPtr[0] == 'x') {
+ ++CurPtr;
+ const char *NumStart = CurPtr;
+ while (isxdigit(CurPtr[0]))
+ ++CurPtr;
+
+ // Requires at least one hex digit.
+ if (CurPtr == NumStart)
+ return ReturnError(TokStart, "Invalid hexadecimal number");
+
+ errno = 0;
+ CurIntVal = strtoll(NumStart, 0, 16);
+ if (errno == EINVAL)
+ return ReturnError(TokStart, "Invalid hexadecimal number");
+ if (errno == ERANGE) {
+ errno = 0;
+ CurIntVal = (int64_t)strtoull(NumStart, 0, 16);
+ if (errno == EINVAL)
+ return ReturnError(TokStart, "Invalid hexadecimal number");
+ if (errno == ERANGE)
+ return ReturnError(TokStart, "Hexadecimal number out of range");
+ }
+ return tgtok::IntVal;
+ } else if (CurPtr[0] == 'b') {
+ ++CurPtr;
+ const char *NumStart = CurPtr;
+ while (CurPtr[0] == '0' || CurPtr[0] == '1')
+ ++CurPtr;
+
+ // Requires at least one binary digit.
+ if (CurPtr == NumStart)
+ return ReturnError(CurPtr-2, "Invalid binary number");
+ CurIntVal = strtoll(NumStart, 0, 2);
+ return tgtok::IntVal;
+ }
+ }
+
+ // Check for a sign without a digit.
+ if (!isdigit(CurPtr[0])) {
+ if (CurPtr[-1] == '-')
+ return tgtok::minus;
+ else if (CurPtr[-1] == '+')
+ return tgtok::plus;
+ }
+
+ while (isdigit(CurPtr[0]))
+ ++CurPtr;
+ CurIntVal = strtoll(TokStart, 0, 10);
+ return tgtok::IntVal;
+}
+
+/// LexBracket - We just read '['. If this is a code block, return it,
+/// otherwise return the bracket. Match: '[' and '[{ ( [^}]+ | }[^]] )* }]'
+tgtok::TokKind TGLexer::LexBracket() {
+ if (CurPtr[0] != '{')
+ return tgtok::l_square;
+ ++CurPtr;
+ const char *CodeStart = CurPtr;
+ while (1) {
+ int Char = getNextChar();
+ if (Char == EOF) break;
+
+ if (Char != '}') continue;
+
+ Char = getNextChar();
+ if (Char == EOF) break;
+ if (Char == ']') {
+ CurStrVal.assign(CodeStart, CurPtr-2);
+ return tgtok::CodeFragment;
+ }
+ }
+
+ return ReturnError(CodeStart-2, "Unterminated Code Block");
+}
+
+/// LexExclaim - Lex '!' and '![a-zA-Z]+'.
+tgtok::TokKind TGLexer::LexExclaim() {
+ if (!isalpha(*CurPtr))
+ return ReturnError(CurPtr - 1, "Invalid \"!operator\"");
+
+ const char *Start = CurPtr++;
+ while (isalpha(*CurPtr))
+ ++CurPtr;
+
+ // Check to see which operator this is.
+ tgtok::TokKind Kind =
+ StringSwitch<tgtok::TokKind>(StringRef(Start, CurPtr - Start))
+ .Case("eq", tgtok::XEq)
+ .Case("if", tgtok::XIf)
+ .Case("head", tgtok::XHead)
+ .Case("tail", tgtok::XTail)
+ .Case("con", tgtok::XConcat)
+ .Case("shl", tgtok::XSHL)
+ .Case("sra", tgtok::XSRA)
+ .Case("srl", tgtok::XSRL)
+ .Case("cast", tgtok::XCast)
+ .Case("empty", tgtok::XEmpty)
+ .Case("subst", tgtok::XSubst)
+ .Case("foreach", tgtok::XForEach)
+ .Case("strconcat", tgtok::XStrConcat)
+ .Default(tgtok::Error);
+
+ return Kind != tgtok::Error ? Kind : ReturnError(Start-1, "Unknown operator");
+}
+
--
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