115 lines
2.0 KiB
Plaintext
115 lines
2.0 KiB
Plaintext
%{
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#include <fxos/symbols.h>
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#include <fxos/errors.h>
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#include <fxos/util.h>
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#include <fxos/load.h>
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#include <cstdarg>
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/* Text value and integer value for parser */
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static char *yylval;
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uint32_t yyival;
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/* Tokens */
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#define SYSCALL 1
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#define ADDRESS 2
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#define NAME 3
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/* Current file name */
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static std::string filename;
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/* Error messages and exceptions */
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static void err(char const *format, ...)
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{
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static char buf[256];
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va_list args;
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va_start(args, format);
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vsnprintf(buf, 256, format, args);
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va_end(args);
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throw FxOS::SyntaxError(filename.c_str(), yylineno, buf);
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}
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%}
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%option prefix="symbols"
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%option noyywrap
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%option nounput
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syscall ^%[0-9A-Fa-f]{3,}
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address ^[0-9A-Fa-f]{8}
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name [a-zA-Z_][a-zA-Z_0-9.]*
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space [ \t]+
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%%
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^#[^\n]* ;
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{space} ;
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[\n] yylineno++;
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{syscall} { yyival = strtol(yytext+1, NULL, 16); return SYSCALL; }
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{address} { yyival = strtol(yytext, NULL, 16); return ADDRESS; }
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{name} { yylval = strdup(yytext); return NAME; }
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. { err("lex error near '%s'", yytext); }
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<<EOF>> { return -1; }
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%%
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namespace FxOS {
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/* Load a symbol table into the disassembler */
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SymbolTable load_symbols(Buffer const &file, size_t start_offset,
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size_t start_line)
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{
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YY_BUFFER_STATE buf = yy_scan_bytes(file.data.get() + start_offset,
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file.size - start_offset);
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yylineno = start_line;
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filename = file.path;
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SymbolTable table;
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/* Current symbol and line */
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Symbol symbol;
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int line = -1;
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while(1)
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{
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int t = yylex();
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if(line >= 0 && (yylineno != line || t != NAME || t == -1))
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{
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/* Finalize current symbol */
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if(symbol.name == "") err("%d: missing name", line);
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else table.add(symbol);
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symbol = Symbol();
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}
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if(t == -1) break;
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if(t == SYSCALL)
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{
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symbol.type = Symbol::Syscall;
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symbol.value = yyival;
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line = yylineno;
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}
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else if(t == ADDRESS)
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{
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symbol.type = Symbol::Address;
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symbol.value = yyival;
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line = yylineno;
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}
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else if(t == NAME)
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{
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symbol.name = yylval;
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free(yylval);
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}
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}
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yy_delete_buffer(buf);
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return table;
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}
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} /* namespace FxOS */
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