-/*===-- FileLexer.l - Scanner for TableGen Files ----------------*- C++ -*-===//
+//===-- FileLexer.l - Scanner for TableGen Files ----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file defines a simple flex scanner for TableGen files. This is pretty
// straight-forward, except for the magic to handle file inclusion.
//
-//===----------------------------------------------------------------------===*/
+//===----------------------------------------------------------------------===//
%option prefix="File"
%option yylineno
// Global variable recording the location of the include directory
std::string IncludeDirectory;
-// ParseInt - This has to handle the special case of binary numbers 0b0101
+/// ParseInt - This has to handle the special case of binary numbers 0b0101
+///
static int ParseInt(const char *Str) {
if (Str[0] == '0' && Str[1] == 'b')
return strtol(Str+2, 0, 2);
static std::vector<IncludeRec> IncludeStack;
-
std::ostream &err() {
if (IncludeStack.empty())
return std::cerr << "At end of input: ";
<< Filelineno << ": ";
}
-
-
-//
-// Function: ParseFile()
-//
-// Description:
-// This function begins the parsing of the specified tablegen file.
-//
-// Inputs:
-// Filename - A string containing the name of the file to parse.
-// IncludeDir - A string containing the directory from which include
-// files can be found.
-//
+/// ParseFile - this function begins the parsing of the specified tablegen file.
+///
void ParseFile(const std::string &Filename, const std::string & IncludeDir) {
FILE *F = stdin;
if (Filename != "-") {
IncludeStack.push_back(IncludeRec("<stdin>", stdin));
}
- //
// Record the location of the include directory so that the lexer can find
// it later.
- //
IncludeDirectory = IncludeDir;
Filein = F;
Filein = stdin;
}
-// HandleInclude - This function is called when an include directive is
-// encountered in the input stream...
+/// HandleInclude - This function is called when an include directive is
+/// encountered in the input stream...
+///
static void HandleInclude(const char *Buffer) {
unsigned Length = yyleng;
assert(Buffer[Length-1] == '"');
// Open the new input file...
yyin = fopen(Filename.c_str(), "r");
if (yyin == 0) {
- //
// If we couldn't find the file in the current directory, look for it in
// the include directories.
//
- // NOTE:
- // Right now, there is only one directory. We need to eventually add
- // support for more.
- //
+ // NOTE: Right now, there is only one directory. We need to eventually add
+ // support for more.
Filename = IncludeDirectory + "/" + Filename;
yyin = fopen(Filename.c_str(), "r");
if (yyin == 0) {
yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
}
-
-// yywrap - This is called when the lexer runs out of input in one of the files.
-// Switch back to an includer if an includee has run out of input.
-//
+/// yywrap - This is called when the lexer runs out of input in one of the
+/// files. Switch back to an includer if an includee has run out of input.
+///
extern "C"
int yywrap() {
if (IncludeStack.back().File != stdin)