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Diffstat (limited to 'frontends/verilog/verilog_lexer.l')
| -rw-r--r-- | frontends/verilog/verilog_lexer.l | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/frontends/verilog/verilog_lexer.l b/frontends/verilog/verilog_lexer.l new file mode 100644 index 000000000..0d28e2e7f --- /dev/null +++ b/frontends/verilog/verilog_lexer.l @@ -0,0 +1,359 @@ +/* + * yosys -- Yosys Open SYnthesis Suite + * + * Copyright (C) 2012 Clifford Wolf <clifford@clifford.at> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * --- + * + * The Verilog frontend. + * + * This frontend is using the AST frontend library (see frontends/ast/). + * Thus this frontend does not generate RTLIL code directly but creates an + * AST directly from the Verilog parse tree and then passes this AST to + * the AST frontend library. + * + * --- + * + * A simple lexer for Verilog code. Non-preprocessor compiler directives are + * handled here. The preprocessor stuff is handled in preproc.cc. Everything + * else is left to the bison parser (see parser.y). + * + */ + +%{ + +#ifdef __clang__ +// bison generates code using the 'register' storage class specifier +#pragma clang diagnostic ignored "-Wdeprecated-register" +#endif + +#include "kernel/log.h" +#include "verilog_frontend.h" +#include "frontends/ast/ast.h" +#include "verilog_parser.tab.h" + +USING_YOSYS_NAMESPACE +using namespace AST; +using namespace VERILOG_FRONTEND; + +YOSYS_NAMESPACE_BEGIN +namespace VERILOG_FRONTEND { + std::vector<std::string> fn_stack; + std::vector<int> ln_stack; +} +YOSYS_NAMESPACE_END + +#define SV_KEYWORD(_tok) \ + if (sv_mode) return _tok; \ + log("Lexer warning: The SystemVerilog keyword `%s' (at %s:%d) is not "\ + "recognized unless read_verilog is called with -sv!\n", yytext, \ + AST::current_filename.c_str(), frontend_verilog_yyget_lineno()); \ + frontend_verilog_yylval.string = new std::string(std::string("\\") + yytext); \ + return TOK_ID; + +#define YY_INPUT(buf,result,max_size) \ + do { \ + lexin->read(buf, max_size-1); \ + result = lexin->gcount(); \ + if (result >= 0) buf[result] = '\0'; \ + } while (0) + +%} + +%option yylineno +%option noyywrap +%option nounput +%option prefix="frontend_verilog_yy" + +%x COMMENT +%x STRING +%x SYNOPSYS_TRANSLATE_OFF +%x SYNOPSYS_FLAGS +%x IMPORT_DPI + +%% + +<INITIAL,SYNOPSYS_TRANSLATE_OFF>"`file_push "[^\n]* { + fn_stack.push_back(current_filename); + ln_stack.push_back(frontend_verilog_yyget_lineno()); + current_filename = yytext+11; + frontend_verilog_yyset_lineno(0); +} + +<INITIAL,SYNOPSYS_TRANSLATE_OFF>"`file_pop"[^\n]*\n { + current_filename = fn_stack.back(); + fn_stack.pop_back(); + frontend_verilog_yyset_lineno(ln_stack.back()); + ln_stack.pop_back(); +} + +<INITIAL,SYNOPSYS_TRANSLATE_OFF>"`line"[ \t]+[^ \t\r\n]+[ \t]+\"[^ \r\n]+\"[^\r\n]*\n { + char *p = yytext + 5; + while (*p == ' ' || *p == '\t') p++; + frontend_verilog_yyset_lineno(atoi(p)); + while (*p && *p != ' ' && *p != '\t') p++; + while (*p == ' ' || *p == '\t') p++; + char *q = *p ? p + 1 : p; + while (*q && *q != '"') q++; + current_filename = std::string(p).substr(1, q-p-1); +} + +"`file_notfound "[^\n]* { + log_error("Can't open include file `%s'!\n", yytext + 15); +} + +"`timescale"[ \t]+[^ \t\r\n/]+[ \t]*"/"[ \t]*[^ \t\r\n]* /* ignore timescale directive */ + +"`default_nettype"[ \t]+[^ \t\r\n/]+ { + char *p = yytext; + while (*p != 0 && *p != ' ' && *p != '\t') p++; + while (*p == ' ' || *p == '\t') p++; + if (!strcmp(p, "none")) + VERILOG_FRONTEND::default_nettype_wire = false; + else if (!strcmp(p, "wire")) + VERILOG_FRONTEND::default_nettype_wire = true; + else + frontend_verilog_yyerror("Unsupported default nettype: %s", p); +} + +"`"[a-zA-Z_$][a-zA-Z0-9_$]* { + frontend_verilog_yyerror("Unimplemented compiler directive or undefined macro %s.", yytext); +} + +"module" { return TOK_MODULE; } +"endmodule" { return TOK_ENDMODULE; } +"function" { return TOK_FUNCTION; } +"endfunction" { return TOK_ENDFUNCTION; } +"task" { return TOK_TASK; } +"endtask" { return TOK_ENDTASK; } +"parameter" { return TOK_PARAMETER; } +"localparam" { return TOK_LOCALPARAM; } +"defparam" { return TOK_DEFPARAM; } +"assign" { return TOK_ASSIGN; } +"always" { return TOK_ALWAYS; } +"initial" { return TOK_INITIAL; } +"begin" { return TOK_BEGIN; } +"end" { return TOK_END; } +"if" { return TOK_IF; } +"else" { return TOK_ELSE; } +"for" { return TOK_FOR; } +"posedge" { return TOK_POSEDGE; } +"negedge" { return TOK_NEGEDGE; } +"or" { return TOK_OR; } +"case" { return TOK_CASE; } +"casex" { return TOK_CASEX; } +"casez" { return TOK_CASEZ; } +"endcase" { return TOK_ENDCASE; } +"default" { return TOK_DEFAULT; } +"generate" { return TOK_GENERATE; } +"endgenerate" { return TOK_ENDGENERATE; } +"while" { return TOK_WHILE; } +"repeat" { return TOK_REPEAT; } + +"always_comb" { SV_KEYWORD(TOK_ALWAYS); } +"always_ff" { SV_KEYWORD(TOK_ALWAYS); } +"always_latch" { SV_KEYWORD(TOK_ALWAYS); } + +"assert" { SV_KEYWORD(TOK_ASSERT); } +"property" { SV_KEYWORD(TOK_PROPERTY); } +"logic" { SV_KEYWORD(TOK_REG); } +"bit" { SV_KEYWORD(TOK_REG); } + +"input" { return TOK_INPUT; } +"output" { return TOK_OUTPUT; } +"inout" { return TOK_INOUT; } +"wire" { return TOK_WIRE; } +"reg" { return TOK_REG; } +"integer" { return TOK_INTEGER; } +"signed" { return TOK_SIGNED; } +"genvar" { return TOK_GENVAR; } +"real" { return TOK_REAL; } + +[0-9]+ { + frontend_verilog_yylval.string = new std::string(yytext); + return TOK_CONST; +} + +[0-9]*[ \t]*\'s?[bodh][ \t\r\n]*[0-9a-fA-FzxZX?_]+ { + frontend_verilog_yylval.string = new std::string(yytext); + return TOK_CONST; +} + +[0-9][0-9_]*\.[0-9][0-9_]*([eE][-+]?[0-9_]+)? { + frontend_verilog_yylval.string = new std::string(yytext); + return TOK_REALVAL; +} + +[0-9][0-9_]*[eE][-+]?[0-9_]+ { + frontend_verilog_yylval.string = new std::string(yytext); + return TOK_REALVAL; +} + +\" { BEGIN(STRING); } +<STRING>\\. { yymore(); } +<STRING>\" { + BEGIN(0); + char *yystr = strdup(yytext); + yystr[strlen(yytext) - 1] = 0; + int i = 0, j = 0; + while (yystr[i]) { + if (yystr[i] == '\\' && yystr[i + 1]) { + i++; + if (yystr[i] == 'n') + yystr[i] = '\n'; + else if (yystr[i] == 't') + yystr[i] = '\t'; + else if ('0' <= yystr[i] && yystr[i] <= '7') { + yystr[i] = yystr[i] - '0'; + if ('0' <= yystr[i + 1] && yystr[i + 1] <= '7') { + yystr[i + 1] = yystr[i] * 8 + yystr[i + 1] - '0'; + i++; + } + if ('0' <= yystr[i + 1] && yystr[i + 1] <= '7') { + yystr[i + 1] = yystr[i] * 8 + yystr[i + 1] - '0'; + i++; + } + } + } + yystr[j++] = yystr[i++]; + } + yystr[j] = 0; + frontend_verilog_yylval.string = new std::string(yystr); + free(yystr); + return TOK_STRING; +} +<STRING>. { yymore(); } + +and|nand|or|nor|xor|xnor|not|buf|bufif0|bufif1|notif0|notif1 { + frontend_verilog_yylval.string = new std::string(yytext); + return TOK_PRIMITIVE; +} + +supply0 { return TOK_SUPPLY0; } +supply1 { return TOK_SUPPLY1; } + +"$"(display|time|stop|finish) { + frontend_verilog_yylval.string = new std::string(yytext); + return TOK_ID; +} + +"$signed" { return TOK_TO_SIGNED; } +"$unsigned" { return TOK_TO_UNSIGNED; } + +[a-zA-Z_$][a-zA-Z0-9_$]* { + frontend_verilog_yylval.string = new std::string(std::string("\\") + yytext); + return TOK_ID; +} + +"/*"[ \t]*(synopsys|synthesis)[ \t]*translate_off[ \t]*"*/" { + log("Warning: Found one of those horrible `(synopsys|synthesis) translate_off' comments.\n"); + log("It is strongly suggested to use `ifdef constructs instead!\n"); + BEGIN(SYNOPSYS_TRANSLATE_OFF); +} +<SYNOPSYS_TRANSLATE_OFF>. /* ignore synopsys translate_off body */ +<SYNOPSYS_TRANSLATE_OFF>\n /* ignore synopsys translate_off body */ +<SYNOPSYS_TRANSLATE_OFF>"/*"[ \t]*(synopsys|synthesis)[ \t]*"translate_on"[ \t]*"*/" { BEGIN(0); } + +"/*"[ \t]*(synopsys|synthesis)[ \t]+ { + BEGIN(SYNOPSYS_FLAGS); +} +<SYNOPSYS_FLAGS>full_case { + log("Warning: Found one of those horrible `(synopsys|synthesis) full_case' comments.\n"); + log("It is strongly suggested to use verilog x-values and default branches instead!\n"); + return TOK_SYNOPSYS_FULL_CASE; +} +<SYNOPSYS_FLAGS>parallel_case { + log("Warning: Found one of those horrible `(synopsys|synthesis) parallel_case' comments.\n"); + log("It is strongly suggested to use verilog `parallel_case' attributes instead!\n"); + return TOK_SYNOPSYS_PARALLEL_CASE; +} +<SYNOPSYS_FLAGS>. /* ignore everything else */ +<SYNOPSYS_FLAGS>"*/" { BEGIN(0); } + +import[ \t\r\n]+\"(DPI|DPI-C)\"[ \t\r\n]+function[ \t\r\n]+ { + BEGIN(IMPORT_DPI); + return TOK_DPI_FUNCTION; +} + +<IMPORT_DPI>[a-zA-Z_$][a-zA-Z0-9_$]* { + frontend_verilog_yylval.string = new std::string(std::string("\\") + yytext); + return TOK_ID; +} + +<IMPORT_DPI>[ \t\r\n] /* ignore whitespaces */ + +<IMPORT_DPI>";" { + BEGIN(0); + return *yytext; +} + +<IMPORT_DPI>. { + return *yytext; +} + +"\\"[^ \t\r\n]+ { + frontend_verilog_yylval.string = new std::string(yytext); + return TOK_ID; +} + +"(*" { return ATTR_BEGIN; } +"*)" { return ATTR_END; } + +"{*" { return DEFATTR_BEGIN; } +"*}" { return DEFATTR_END; } + +"**" { return OP_POW; } +"||" { return OP_LOR; } +"&&" { return OP_LAND; } +"==" { return OP_EQ; } +"!=" { return OP_NE; } +"<=" { return OP_LE; } +">=" { return OP_GE; } + +"===" { return OP_EQX; } +"!==" { return OP_NEX; } + +"~&" { return OP_NAND; } +"~|" { return OP_NOR; } +"~^" { return OP_XNOR; } +"^~" { return OP_XNOR; } + +"<<" { return OP_SHL; } +">>" { return OP_SHR; } +"<<<" { return OP_SSHL; } +">>>" { return OP_SSHR; } + +"+:" { return TOK_POS_INDEXED; } +"-:" { return TOK_NEG_INDEXED; } + +"/*" { BEGIN(COMMENT); } +<COMMENT>. /* ignore comment body */ +<COMMENT>\n /* ignore comment body */ +<COMMENT>"*/" { BEGIN(0); } + +[ \t\r\n] /* ignore whitespaces */ +\\[\r\n] /* ignore continuation sequence */ +"//"[^\r\n]* /* ignore one-line comments */ +"#"[$a-zA-Z_0-9\.]+ /* ignore simulation timings */ + +. { return *yytext; } + +%% + +// this is a hack to avoid the 'yyinput defined but not used' error msgs +void *frontend_verilog_avoid_input_warnings() { + return (void*)&yyinput; +} + |