/*===-- FileLexer.l - Scanner for TableGen Files ----------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
-//===------------------------------------------------------------------------=*/
+// 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
%option nostdinit
%option never-interactive
%option batch
-%option noyywrap
%option nodefault
%option 8bit
%option outfile="Lexer.cpp"
%x comment
%{
+#include "llvm/Config/config.h"
#include "Record.h"
-typedef std::pair<Record*, std::vector<Init*>*> SubClassRefTy;
+typedef std::pair<llvm::Record*, std::vector<llvm::Init*>*> SubClassRefTy;
#include "FileParser.h"
-// ParseInt - This has to handle the special case of binary numbers 0b0101
+int Fileparse();
+
+namespace llvm {
+
+// Global variable recording the location of the include directory
+std::vector<std::string> IncludeDirectories;
+
+/// 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);
- return strtol(Str, 0, 0);
+ return strtoll(Str+2, 0, 2);
+ return strtoll(Str, 0, 0);
}
static int CommentDepth = 0;
+struct IncludeRec {
+ std::string Filename;
+ FILE *File;
+ unsigned LineNo;
+ YY_BUFFER_STATE Buffer;
+
+ IncludeRec(const std::string &FN, FILE *F)
+ : Filename(FN), File(F), LineNo(0){
+ }
+};
+
+static std::vector<IncludeRec> IncludeStack;
+
+std::ostream &err() {
+ if (IncludeStack.empty())
+ return std::cerr << "At end of input: ";
+
+ for (unsigned i = 0, e = IncludeStack.size()-1; i != e; ++i)
+ std::cerr << "Included from " << IncludeStack[i].Filename << ":"
+ << IncludeStack[i].LineNo << ":\n";
+ return std::cerr << "Parsing " << IncludeStack.back().Filename << ":"
+ << Filelineno << ": ";
+}
+
+/// ParseFile - this function begins the parsing of the specified tablegen file.
+///
+void ParseFile(const std::string &Filename,
+ const std::vector<std::string> &IncludeDirs) {
+ FILE *F = stdin;
+ if (Filename != "-") {
+ F = fopen(Filename.c_str(), "r");
+
+ if (F == 0) {
+ std::cerr << "Could not open input file '" + Filename + "'!\n";
+ exit (1);
+ }
+ IncludeStack.push_back(IncludeRec(Filename, F));
+ } else {
+ IncludeStack.push_back(IncludeRec("<stdin>", stdin));
+ }
+
+ // Record the location of the include directory so that the lexer can find
+ // it later.
+ IncludeDirectories = IncludeDirs;
+
+ Filein = F;
+ Filelineno = 1;
+ Fileparse();
+ Filein = stdin;
+}
+
+/// 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] == '"');
+ Buffer += strlen("include ");
+ Length -= strlen("include ");
+ while (*Buffer != '"') {
+ ++Buffer;
+ --Length;
+ }
+ assert(Length >= 2 && "Double quotes not found?");
+ std::string Filename(Buffer+1, Buffer+Length-1);
+ //std::cerr << "Filename = '" << Filename << "'\n";
+
+ // Save the line number and lex buffer of the includer...
+ IncludeStack.back().LineNo = Filelineno;
+ IncludeStack.back().Buffer = YY_CURRENT_BUFFER;
+
+ // 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.
+ //
+ std::string NextFilename;
+ for (unsigned i = 0, e = IncludeDirectories.size(); i != e; ++i) {
+ NextFilename = IncludeDirectories[i] + "/" + Filename;
+ if ((yyin = fopen(NextFilename.c_str(), "r")))
+ break;
+ }
+
+ if (yyin == 0) {
+ err() << "Could not find include file '" << Filename << "'!\n";
+ exit(1);
+ }
+ Filename = NextFilename;
+ }
+
+ // Add the file to our include stack...
+ IncludeStack.push_back(IncludeRec(Filename, yyin));
+ Filelineno = 1; // Reset line numbering...
+ //yyrestart(yyin); // Start lexing the new file...
+
+ 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.
+///
+extern "C"
+int yywrap(void) {
+ if (IncludeStack.back().File != stdin)
+ fclose(IncludeStack.back().File);
+ IncludeStack.pop_back();
+ if (IncludeStack.empty()) return 1; // Top-level file is done.
+
+ // Otherwise, we need to switch back to a file which included the current one.
+ Filelineno = IncludeStack.back().LineNo; // Restore current line number
+ yy_switch_to_buffer(IncludeStack.back().Buffer);
+ return 0;
+}
+
+} // End llvm namespace
+
+using namespace llvm;
+
%}
-Comment \/\/.*
+Comment \/\/.*
-Identifier [a-zA-Z_][0-9a-zA-Z_]*
-Integer [-+]?[0-9]+|0x[0-9a-fA-F]+|0b[01]+
-StringVal \"[^"]*\"
+Identifier [a-zA-Z_][0-9a-zA-Z_]*
+Integer [-+]?[0-9]+|0x[0-9a-fA-F]+|0b[01]+
+CodeFragment \[\{([^}]+|\}[^\]])*\}\]
+StringVal \"[^"]*\"
+IncludeStr include[ \t\n]+\"[^"]*\"
%%
{Comment} { /* Ignore comments */ }
+{IncludeStr} { HandleInclude(yytext); }
+{CodeFragment} { Filelval.StrVal = new std::string(yytext+2, yytext+yyleng-2);
+ return CODEFRAGMENT; }
+
int { return INT; }
bit { return BIT; }
bits { return BITS; }
string { return STRING; }
list { return LIST; }
+code { return CODE; }
+dag { return DAG; }
class { return CLASS; }
def { return DEF; }
+defm { return DEFM; }
+multiclass { return MULTICLASS; }
field { return FIELD; }
-set { return SET; }
+let { return LET; }
in { return IN; }
+!sra { return SRATOK; }
+!srl { return SRLTOK; }
+!shl { return SHLTOK; }
+!strconcat { return STRCONCATTOK; }
+
+
{Identifier} { Filelval.StrVal = new std::string(yytext, yytext+yyleng);
return ID; }
+${Identifier} { Filelval.StrVal = new std::string(yytext+1, yytext+yyleng);
+ return VARNAME; }
{StringVal} { Filelval.StrVal = new std::string(yytext+1, yytext+yyleng-1);
return STRVAL; }
{Integer} { Filelval.IntVal = ParseInt(Filetext); return INTVAL; }
-[ \t\n]+ { /* Ignore whitespace */ }
-. { return Filetext[0]; }
+[ \t\n\r]+ { /* Ignore whitespace */ }
"/*" { BEGIN(comment); CommentDepth++; }
-<comment>[^*/]* /* eat anything that's not a '*' or '/' */
-<comment>"*"+[^*/]* /* eat up '*'s not followed by '/'s */
+<comment>[^*/]* {} /* eat anything that's not a '*' or '/' */
+<comment>"*"+[^*/]* {} /* eat up '*'s not followed by '/'s */
<comment>"/*" { ++CommentDepth; }
-<comment>"/"+[^*]* /* eat up /'s not followed by *'s */
+<comment>"/"+[^*/]* {} /* eat up /'s not followed by *'s */
<comment>"*"+"/" { if (!--CommentDepth) { BEGIN(INITIAL); } }
-<comment><<EOF>> { fprintf(stderr, "Unterminated comment!\n"); abort(); }
+<comment><<EOF>> { err() << "Unterminated comment!\n"; exit(1); }
+
+. { return Filetext[0]; }
%%
+
projects / oota-llvm.git / blobdiff