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yosys/frontends/verilog/verilog_lexer.l
Jannis Harder 79e05a195d verilog: Bufnorm cell backend and frontend support 
This makes the Verilog backend handle the $connect and $input_port
cells. This represents the undirected $connect cell using the `tran`
primitive, so we also extend the frontend to support this.
2025-09-17 14:01:09 +02:00

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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Claire Xenia Wolf <claire@yosyshq.com>
*
* 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 verilog_parser.y).
*
*/
%option c++
%option yyclass="VerilogLexer"
%option noyywrap
%option nounput
%option yylineno
%option prefix="frontend_verilog_yy"
%{
#ifdef __clang__
// bison generates code using the 'register' storage class specifier
#pragma clang diagnostic ignored "-Wdeprecated-register"
// flex generates weirdly-indented code
#pragma clang diagnostic ignored "-Wmisleading-indentation"
#endif
#include "frontends/verilog/verilog_lexer.h"
#include "frontends/ast/ast.h"
#include "frontends/verilog/verilog_location.h"
#include "kernel/log.h"
#include <vector>
#include <memory>
USING_YOSYS_NAMESPACE
using namespace AST;
using namespace VERILOG_FRONTEND;
using parser = frontend_verilog_yy::parser;
YOSYS_NAMESPACE_BEGIN
#undef YY_DECL
#define YY_DECL parser::symbol_type VerilogLexer::nextToken()
#undef yyterminate
#define yyterminate() return terminate()
YOSYS_NAMESPACE_END
#define SV_KEYWORD(_tok) \
if (mode->sv) return _tok; \
log("Lexer warning: The SystemVerilog keyword `%s' (at %s:%d) is not "\
"recognized unless read_verilog is called with -sv!\n", YYText(), \
current_filename->c_str(), yylineno); \
string_t val = std::make_unique<std::string>(std::string("\\") + YYText()); \
return parser::make_TOK_ID(std::move(val), out_loc);
#define NON_KEYWORD() \
string_t val = std::make_unique<std::string>(std::string("\\") + YYText()); \
return parser::make_TOK_ID(std::move(val), out_loc);
#define YY_USER_ACTION \
out_loc.step(); \
for(int i = 0; YYText()[i] != '\0'; ++i){ \
if(YYText()[i] == '\n') { \
out_loc.lines(); \
} \
else { \
out_loc.columns(); \
} \
} \
out_loc.begin.filename = current_filename; \
out_loc.end.filename = current_filename;
#define YY_BREAK \
break;
#undef YY_BUF_SIZE
#define YY_BUF_SIZE 65536
static bool isUserType(ParseState* extra, std::string &s)
{
// check current scope then outer scopes for a name
for (auto it = extra->user_type_stack.rbegin(); it != extra->user_type_stack.rend(); ++it) {
if (it->count(s) > 0) {
return true;
}
}
return false;
}
parser::symbol_type char_tok(char c, parser::location_type loc) {
switch (c) {
case '!': return parser::make_TOK_EXCL(loc);
case '#': return parser::make_TOK_HASH(loc);
case '%': return parser::make_TOK_PERC(loc);
case '&': return parser::make_TOK_AMP(loc);
case '(': return parser::make_TOK_LPAREN(loc);
case ')': return parser::make_TOK_RPAREN(loc);
case '*': return parser::make_TOK_ASTER(loc);
case '+': return parser::make_TOK_PLUS(loc);
case ',': return parser::make_TOK_COMMA(loc);
case '-': return parser::make_TOK_MINUS(loc);
case '.': return parser::make_TOK_DOT(loc);
case '/': return parser::make_TOK_SLASH(loc);
case ':': return parser::make_TOK_COL(loc);
case ';': return parser::make_TOK_SEMICOL(loc);
case '<': return parser::make_TOK_LT(loc);
case '=': return parser::make_TOK_EQ(loc);
case '>': return parser::make_TOK_GT(loc);
case '?': return parser::make_TOK_QUE(loc);
case '@': return parser::make_TOK_AT(loc);
case '[': return parser::make_TOK_LBRA(loc);
case ']': return parser::make_TOK_RBRA(loc);
case '^': return parser::make_TOK_CARET(loc);
case '_': return parser::make_TOK_UNDER(loc);
case '{': return parser::make_TOK_LCURL(loc);
case '|': return parser::make_TOK_PIPE(loc);
case '}': return parser::make_TOK_RCURL(loc);
case '~': return parser::make_TOK_TILDE(loc);
case 'n': return parser::make_TOK_n(loc);
case 'p': return parser::make_TOK_p(loc);
case 'x': return parser::make_TOK_x(loc);
case 'z': return parser::make_TOK_z(loc);
case 0: return parser::make_FRONTEND_VERILOG_YYEOF(loc);
default:
return parser::make_ch_t(c, loc);
}
}
static bool is_hex_dig(char c, int *val, parser::location_type loc)
{
if ('0' <= c && c <= '9') {
*val = c - '0';
return true;
} else if ('a' <= c && c <= 'f') {
*val = c - 'a' + 0xA;
return true;
} else if ('A' <= c && c <= 'F') {
*val = c - 'A' + 0xA;
return true;
} else if (c == 'x' || c == 'X' || c == 'z' || c == 'Z' || c == '?') {
log_file_warning(*loc.begin.filename, loc.begin.line, "'%c' not a valid digit in hex escape sequence.\n", c);
*val = 0; // not semantically valid in hex escape...
return true; // ...but still processed as part of hex token
}
return false;
}
static bool is_oct_dig(char c, int *val, parser::location_type loc)
{
if ('0' <= c && c <= '7') {
*val = c - '0';
return true;
} else if (c == 'x' || c == 'X' || c == 'z' || c == 'Z' || c == '?') {
log_file_warning(*loc.begin.filename, loc.begin.line, "'%c' not a valid digit in octal escape sequence.\n", c);
*val = 0; // not semantically valid in octal escape...
return true; // ...but still processed as part of octal token
}
return false;
}
static parser::symbol_type process_str(char *str, int len, bool triple, parser::location_type loc)
{
char *in, *out; // Overwrite input buffer: flex manual states "Actions
// are free to modify 'yytext' except for lengthening it".
for (in = str, out = str; in < str + len; in++)
switch (*in) {
case '\n':
case '\r':
if (in + 1 < str + len && (in[1] ^ *in) == ('\n' ^ '\r'))
in++;
if (!triple)
log_file_warning(*loc.begin.filename, loc.begin.line, "Multi-line string literals should be triple-quoted or escaped.\n");
*out++ = '\n';
break;
case '\\':
in++;
log_assert(in < str + len);
switch (*in) {
case 'a':
*out++ = '\a';
break;
case 'f':
*out++ = '\f';
break;
case 'n':
*out++ = '\n';
break;
case 'r': /* not part of IEEE-1800 2023, but seems
like a good idea to support it anyway */
*out++ = '\r';
break;
case 't':
*out++ = '\t';
break;
case 'v':
*out++ = '\v';
break;
case 'x':
int val;
if (in + 1 < str + len && is_hex_dig(in[1], &val, loc)) {
*out = val;
in++;
if (in + 1 < str + len && is_hex_dig(in[1], &val, loc)) {
*out = *out * 0x10 + val;
in++;
}
out++;
} else
log_file_warning(*loc.begin.filename, loc.begin.line, "ignoring invalid hex escape.\n");
break;
case '\\':
*out++ = '\\';
break;
case '"':
*out++ = '"';
break;
case '\n':
case '\r':
if (in + 1 < str + len && (in[1] ^ *in) == ('\n' ^ '\r'))
in++;
break;
default:
if ('0' <= *in && *in <= '7') {
int val;
*out = *in - '0';
if (in + 1 < str + len && is_oct_dig(in[1], &val, loc)) {
*out = *out * 010 + val;
in++;
if (in + 1 < str + len && is_oct_dig(in[1], &val, loc)) {
if (*out >= 040)
log_file_warning(*loc.begin.filename, loc.begin.line, "octal escape exceeds \\377\n");
*out = *out * 010 + val;
in++;
}
}
out++;
} else
*out++ = *in;
}
break;
default:
*out++ = *in;
}
return parser::make_TOK_STRING(std::make_unique<std::string>(str, out - str), loc);
}
%}
%x COMMENT
%x SYNOPSYS_TRANSLATE_OFF
%x SYNOPSYS_FLAGS
%x IMPORT_DPI
%x BASED_CONST
UNSIGNED_NUMBER [0-9][0-9_]*
FIXED_POINT_NUMBER_DEC [0-9][0-9_]*\.[0-9][0-9_]*([eE][-+]?[0-9_]+)?
FIXED_POINT_NUMBER_NO_DEC [0-9][0-9_]*[eE][-+]?[0-9_]+
TIME_SCALE_SUFFIX [munpf]?s
%%
// Initialise comment_caller to something to avoid a "maybe undefined"
// warning from GCC.
int comment_caller = INITIAL;
<INITIAL,SYNOPSYS_TRANSLATE_OFF>"`file_push "[^\n]* {
fn_stack.push_back(current_filename);
ln_stack.push_back(yylineno);
std::string filename = YYText()+11;
if (!filename.empty() && filename.front() == '"')
filename = filename.substr(1);
if (!filename.empty() && filename.back() == '"')
filename = filename.substr(0, filename.size()-1);
current_filename = std::make_shared<std::string>(filename);
yylineno = (0);
out_loc.begin.line = out_loc.end.line = 0;
}
<INITIAL,SYNOPSYS_TRANSLATE_OFF>"`file_pop"[^\n]*\n {
current_filename = fn_stack.back();
fn_stack.pop_back();
yylineno = (ln_stack.back());
out_loc.begin.line = out_loc.end.line = ln_stack.back();
ln_stack.pop_back();
}
<INITIAL,SYNOPSYS_TRANSLATE_OFF>"`line"[ \t]+[^ \t\r\n]+[ \t]+\"[^ \r\n]+\"[^\r\n]*\n {
const char *p = YYText() + 5;
while (*p == ' ' || *p == '\t') p++;
yylineno = (atoi(p));
out_loc.begin.line = out_loc.end.line = atoi(p);
while (*p && *p != ' ' && *p != '\t') p++;
while (*p == ' ' || *p == '\t') p++;
const char *q = *p ? p + 1 : p;
while (*q && *q != '"') q++;
current_filename = std::make_shared<std::string>(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 */
"`celldefine"[^\n]* /* ignore `celldefine */
"`endcelldefine"[^\n]* /* ignore `endcelldefine */
"`default_nettype"[ \t]+[^ \t\r\n/]+ {
const char *p = YYText();
while (*p != 0 && *p != ' ' && *p != '\t') p++;
while (*p == ' ' || *p == '\t') p++;
if (!strcmp(p, "none"))
extra->default_nettype_wire = false;
else if (!strcmp(p, "wire"))
extra->default_nettype_wire = true;
else
err_at_loc(out_loc, "Unsupported default nettype: %s", p);
}
"`protect"[^\n]* /* ignore `protect*/
"`endprotect"[^\n]* /* ignore `endprotect*/
"`"[a-zA-Z_$][a-zA-Z0-9_$]* {
err_at_loc(out_loc, "Unimplemented compiler directive or undefined macro %s.", YYText());
}
"module" { return parser::make_TOK_MODULE(out_loc); }
"endmodule" { return parser::make_TOK_ENDMODULE(out_loc); }
"function" { return parser::make_TOK_FUNCTION(out_loc); }
"endfunction" { return parser::make_TOK_ENDFUNCTION(out_loc); }
"task" { return parser::make_TOK_TASK(out_loc); }
"endtask" { return parser::make_TOK_ENDTASK(out_loc); }
"specify" { return mode->specify ? parser::make_TOK_SPECIFY(out_loc) : parser::make_TOK_IGNORED_SPECIFY(out_loc); }
"endspecify" { return parser::make_TOK_ENDSPECIFY(out_loc); }
"specparam" { return parser::make_TOK_SPECPARAM(out_loc); }
"package" { SV_KEYWORD(parser::make_TOK_PACKAGE(out_loc)); }
"endpackage" { SV_KEYWORD(parser::make_TOK_ENDPACKAGE(out_loc)); }
"import" { SV_KEYWORD(parser::make_TOK_IMPORT(out_loc)); }
"interface" { SV_KEYWORD(parser::make_TOK_INTERFACE(out_loc)); }
"endinterface" { SV_KEYWORD(parser::make_TOK_ENDINTERFACE(out_loc)); }
"modport" { SV_KEYWORD(parser::make_TOK_MODPORT(out_loc)); }
"parameter" { return parser::make_TOK_PARAMETER(out_loc); }
"localparam" { return parser::make_TOK_LOCALPARAM(out_loc); }
"defparam" { return parser::make_TOK_DEFPARAM(out_loc); }
"assign" { return parser::make_TOK_ASSIGN(out_loc); }
"always" { return parser::make_TOK_ALWAYS(out_loc); }
"initial" { return parser::make_TOK_INITIAL(out_loc); }
"begin" { return parser::make_TOK_BEGIN(out_loc); }
"end" { return parser::make_TOK_END(out_loc); }
"if" { return parser::make_TOK_IF(out_loc); }
"ifnone" { return parser::make_TOK_IFNONE(out_loc); }
"else" { return parser::make_TOK_ELSE(out_loc); }
"for" { return parser::make_TOK_FOR(out_loc); }
"posedge" { return parser::make_TOK_POSEDGE(out_loc); }
"negedge" { return parser::make_TOK_NEGEDGE(out_loc); }
"or" { return parser::make_TOK_OR(out_loc); }
"case" { return parser::make_TOK_CASE(out_loc); }
"casex" { return parser::make_TOK_CASEX(out_loc); }
"casez" { return parser::make_TOK_CASEZ(out_loc); }
"endcase" { return parser::make_TOK_ENDCASE(out_loc); }
"default" { return parser::make_TOK_DEFAULT(out_loc); }
"generate" { return parser::make_TOK_GENERATE(out_loc); }
"endgenerate" { return parser::make_TOK_ENDGENERATE(out_loc); }
"while" { return parser::make_TOK_WHILE(out_loc); }
"repeat" { return parser::make_TOK_REPEAT(out_loc); }
"automatic" { return parser::make_TOK_AUTOMATIC(out_loc); }
"unique" { SV_KEYWORD(parser::make_TOK_UNIQUE(out_loc)); }
"unique0" { SV_KEYWORD(parser::make_TOK_UNIQUE0(out_loc)); }
"priority" { SV_KEYWORD(parser::make_TOK_PRIORITY(out_loc)); }
"always_comb" { SV_KEYWORD(parser::make_TOK_ALWAYS_COMB(out_loc)); }
"always_ff" { SV_KEYWORD(parser::make_TOK_ALWAYS_FF(out_loc)); }
"always_latch" { SV_KEYWORD(parser::make_TOK_ALWAYS_LATCH(out_loc)); }
/* use special token for labels on assert, assume, cover, and restrict because it's insanley complex
to fix parsing of cells otherwise. (the current cell parser forces a reduce very early to update some
global state.. its a mess) */
[a-zA-Z_$][a-zA-Z0-9_$]*/[ \t\r\n]*:[ \t\r\n]*(assert|assume|cover|restrict)[^a-zA-Z0-9_$\.] {
if (!strcmp(YYText(), "default"))
return parser::make_TOK_DEFAULT(out_loc);
string_t val = std::make_unique<std::string>(std::string("\\") + YYText());
return parser::make_TOK_SVA_LABEL(std::move(val), out_loc);
}
"assert" { if (mode->formal) return parser::make_TOK_ASSERT(out_loc); SV_KEYWORD(parser::make_TOK_ASSERT(out_loc)); }
"assume" { if (mode->formal) return parser::make_TOK_ASSUME(out_loc); SV_KEYWORD(parser::make_TOK_ASSUME(out_loc)); }
"cover" { if (mode->formal) return parser::make_TOK_COVER(out_loc); SV_KEYWORD(parser::make_TOK_COVER(out_loc)); }
"restrict" { if (mode->formal) return parser::make_TOK_RESTRICT(out_loc); SV_KEYWORD(parser::make_TOK_RESTRICT(out_loc)); }
"property" { if (mode->formal) return parser::make_TOK_PROPERTY(out_loc); SV_KEYWORD(parser::make_TOK_PROPERTY(out_loc)); }
"rand" { if (mode->formal) return parser::make_TOK_RAND(out_loc); SV_KEYWORD(parser::make_TOK_RAND(out_loc)); }
"const" { if (mode->formal) return parser::make_TOK_CONST(out_loc); SV_KEYWORD(parser::make_TOK_CONST(out_loc)); }
"checker" { if (mode->formal) return parser::make_TOK_CHECKER(out_loc); SV_KEYWORD(parser::make_TOK_CHECKER(out_loc)); }
"endchecker" { if (mode->formal) return parser::make_TOK_ENDCHECKER(out_loc); SV_KEYWORD(parser::make_TOK_ENDCHECKER(out_loc)); }
"bind" { if (mode->formal) return parser::make_TOK_BIND(out_loc); SV_KEYWORD(parser::make_TOK_BIND(out_loc)); }
"final" { SV_KEYWORD(parser::make_TOK_FINAL(out_loc)); }
"logic" { SV_KEYWORD(parser::make_TOK_LOGIC(out_loc)); }
"var" { SV_KEYWORD(parser::make_TOK_VAR(out_loc)); }
"bit" { SV_KEYWORD(parser::make_TOK_LOGIC(out_loc)); }
"int" { SV_KEYWORD(parser::make_TOK_INT(out_loc)); }
"byte" { SV_KEYWORD(parser::make_TOK_BYTE(out_loc)); }
"shortint" { SV_KEYWORD(parser::make_TOK_SHORTINT(out_loc)); }
"longint" { SV_KEYWORD(parser::make_TOK_LONGINT(out_loc)); }
"void" { SV_KEYWORD(parser::make_TOK_VOID(out_loc)); }
"eventually" { if (mode->formal) return parser::make_TOK_EVENTUALLY(out_loc); SV_KEYWORD(parser::make_TOK_EVENTUALLY(out_loc)); }
"s_eventually" { if (mode->formal) return parser::make_TOK_EVENTUALLY(out_loc); SV_KEYWORD(parser::make_TOK_EVENTUALLY(out_loc)); }
"input" { return parser::make_TOK_INPUT(out_loc); }
"output" { return parser::make_TOK_OUTPUT(out_loc); }
"inout" { return parser::make_TOK_INOUT(out_loc); }
"wire" { return parser::make_TOK_WIRE(out_loc); }
"tri" { return parser::make_TOK_WIRE(out_loc); }
"wor" { return parser::make_TOK_WOR(out_loc); }
"trior" { return parser::make_TOK_WOR(out_loc); }
"wand" { return parser::make_TOK_WAND(out_loc); }
"triand" { return parser::make_TOK_WAND(out_loc); }
"reg" { return parser::make_TOK_REG(out_loc); }
"integer" { return parser::make_TOK_INTEGER(out_loc); }
"signed" { return parser::make_TOK_SIGNED(out_loc); }
"unsigned" { SV_KEYWORD(parser::make_TOK_UNSIGNED(out_loc)); }
"genvar" { return parser::make_TOK_GENVAR(out_loc); }
"real" { return parser::make_TOK_REAL(out_loc); }
"enum" { SV_KEYWORD(parser::make_TOK_ENUM(out_loc)); }
"typedef" { SV_KEYWORD(parser::make_TOK_TYPEDEF(out_loc)); }
"struct" { SV_KEYWORD(parser::make_TOK_STRUCT(out_loc)); }
"union" { SV_KEYWORD(parser::make_TOK_UNION(out_loc)); }
"packed" { SV_KEYWORD(parser::make_TOK_PACKED(out_loc)); }
{UNSIGNED_NUMBER} {
string_t val = std::make_unique<std::string>(YYText());
return parser::make_TOK_CONSTVAL(std::move(val), out_loc);
}
\'[01zxZX] {
string_t val = std::make_unique<std::string>(YYText());
return parser::make_TOK_UNBASED_UNSIZED_CONSTVAL(std::move(val), out_loc);
}
\'[sS]?[bodhBODH] {
BEGIN(BASED_CONST);
string_t val = std::make_unique<std::string>(YYText());
return parser::make_TOK_BASE(std::move(val), out_loc);
}
<BASED_CONST>[0-9a-fA-FzxZX?][0-9a-fA-FzxZX?_]* {
BEGIN(0);
string_t val = std::make_unique<std::string>(YYText());
return parser::make_TOK_BASED_CONSTVAL(std::move(val), out_loc);
}
{FIXED_POINT_NUMBER_DEC} {
string_t val = std::make_unique<std::string>(YYText());
return parser::make_TOK_REALVAL(std::move(val), out_loc);
}
{FIXED_POINT_NUMBER_NO_DEC} {
string_t val = std::make_unique<std::string>(YYText());
return parser::make_TOK_REALVAL(std::move(val), out_loc);
}
\"([^\\"]|\\.|\\\n)*\" { return process_str(yytext + 1, yyleng - 2, false, out_loc); }
\"{3}(\"{0,2}([^\\"]|\\.|\\\n))*\"{3} { return process_str(yytext + 3, yyleng - 6, true, out_loc); }
and|nand|or|nor|xor|xnor|not|buf|bufif0|bufif1|notif0|notif1|tran {
auto val = std::make_unique<std::string>(YYText());
return parser::make_TOK_PRIMITIVE(std::move(val), out_loc);
}
supply0 { return parser::make_TOK_SUPPLY0(out_loc); }
supply1 { return parser::make_TOK_SUPPLY1(out_loc); }
"$"(display[bho]?|write[bho]?|strobe|monitor|time|realtime|stop|finish|dumpfile|dumpvars|dumpon|dumpoff|dumpall) {
auto val = std::make_unique<std::string>(YYText());
return parser::make_TOK_ID(std::move(val), out_loc);
}
"$"(setup|hold|setuphold|removal|recovery|recrem|skew|timeskew|fullskew|nochange) {
if (!mode->specify) REJECT;
auto val = std::make_unique<std::string>(YYText());
return parser::make_TOK_ID(std::move(val), out_loc);
}
"$"(info|warning|error|fatal) {
auto val = std::make_unique<std::string>(YYText());
return parser::make_TOK_MSG_TASKS(std::move(val), out_loc);
}
"$signed" { return parser::make_TOK_TO_SIGNED(out_loc); }
"$unsigned" { return parser::make_TOK_TO_UNSIGNED(out_loc); }
[a-zA-Z_][a-zA-Z0-9_]*::[a-zA-Z_$][a-zA-Z0-9_$]* {
// package qualifier
auto s = std::string("\\") + YYText();
if (extra->pkg_user_types.count(s) > 0) {
// package qualified typedefed name
auto val = std::make_unique<std::string>(s);
return parser::make_TOK_PKG_USER_TYPE(std::move(val), out_loc);
}
else {
// backup before :: just return first part
size_t len = strchr(YYText(), ':') - YYText();
yyless(len);
auto val = std::make_unique<std::string>(std::string("\\") + YYText());
return parser::make_TOK_ID(std::move(val), out_loc);
}
}
[a-zA-Z_$][a-zA-Z0-9_$]* {
auto s = std::string("\\") + YYText();
if (isUserType(extra, s)) {
// previously typedefed name
auto val = std::make_unique<std::string>(s);
return parser::make_TOK_USER_TYPE(std::move(val), out_loc);
}
else {
auto val = std::make_unique<std::string>(std::string("\\") + YYText());
return parser::make_TOK_ID(std::move(val), out_loc);
}
}
[a-zA-Z_$][a-zA-Z0-9_$\.]* {
auto val = std::make_unique<std::string>(std::string("\\") + YYText());
return parser::make_TOK_ID(std::move(val), out_loc);
}
"/*"[ \t]*(synopsys|synthesis)[ \t]*translate_off[ \t]*"*/" {
static bool printed_warning = false;
if (!printed_warning) {
log_warning(
"Encountered `translate_off' comment! Such legacy hot "
"comments are supported by Yosys, but are not part of "
"any formal language specification. Using a portable "
"and standards-compliant construct such as `ifdef is "
"recommended!\n"
);
printed_warning = true;
}
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 {
static bool printed_warning = false;
if (!printed_warning) {
log_warning(
"Encountered `full_case' comment! Such legacy hot "
"comments are supported by Yosys, but are not part of "
"any formal language specification. Using the Verilog "
"`full_case' attribute or the SystemVerilog `unique' "
"or `unique0' keywords is recommended!\n"
);
printed_warning = true;
}
return parser::make_TOK_SYNOPSYS_FULL_CASE(out_loc);
}
<SYNOPSYS_FLAGS>parallel_case {
static bool printed_warning = false;
if (!printed_warning) {
log_warning(
"Encountered `parallel_case' comment! Such legacy hot "
"comments are supported by Yosys, but are not part of "
"any formal language specification. Using the Verilog "
"`parallel_case' attribute or the SystemVerilog "
"`unique' or `priority' keywords is recommended!\n"
);
printed_warning = true;
}
return parser::make_TOK_SYNOPSYS_PARALLEL_CASE(out_loc);
}
<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 parser::make_TOK_DPI_FUNCTION(out_loc);
}
<IMPORT_DPI>[a-zA-Z_$][a-zA-Z0-9_$]* {
auto val = std::make_unique<std::string>(std::string("\\") + YYText());
return parser::make_TOK_ID(std::move(val), out_loc);
}
<IMPORT_DPI>[ \t\r\n] /* ignore whitespaces */
<IMPORT_DPI>";" {
BEGIN(0);
return char_tok(*YYText(), out_loc);
}
<IMPORT_DPI>. {
return char_tok(*YYText(), out_loc);
}
"\\"[^ \t\r\n]+ {
auto val = std::make_unique<std::string>(YYText());
return parser::make_TOK_ID(std::move(val), out_loc);
}
"(*" { return parser::make_ATTR_BEGIN(out_loc); }
"*)" { return parser::make_ATTR_END(out_loc); }
"{*" { return parser::make_DEFATTR_BEGIN(out_loc); }
"*}" { return parser::make_DEFATTR_END(out_loc); }
"**" { return parser::make_OP_POW(out_loc); }
"||" { return parser::make_OP_LOR(out_loc); }
"&&" { return parser::make_OP_LAND(out_loc); }
"==" { return parser::make_OP_EQ(out_loc); }
"!=" { return parser::make_OP_NE(out_loc); }
"<=" { return parser::make_OP_LE(out_loc); }
">=" { return parser::make_OP_GE(out_loc); }
"===" { return parser::make_OP_EQX(out_loc); }
"!==" { return parser::make_OP_NEX(out_loc); }
"~&" { return parser::make_OP_NAND(out_loc); }
"~|" { return parser::make_OP_NOR(out_loc); }
"~^" { return parser::make_OP_XNOR(out_loc); }
"^~" { return parser::make_OP_XNOR(out_loc); }
"<<" { return parser::make_OP_SHL(out_loc); }
">>" { return parser::make_OP_SHR(out_loc); }
"<<<" { return parser::make_OP_SSHL(out_loc); }
">>>" { return parser::make_OP_SSHR(out_loc); }
"'" { return parser::make_OP_CAST(out_loc); }
"::" { return parser::make_TOK_PACKAGESEP(out_loc); }
"++" { return parser::make_TOK_INCREMENT(out_loc); }
"--" { return parser::make_TOK_DECREMENT(out_loc); }
"+:" { return parser::make_TOK_POS_INDEXED(out_loc); }
"-:" { return parser::make_TOK_NEG_INDEXED(out_loc); }
".*" { return parser::make_TOK_WILDCARD_CONNECT(out_loc); }
"|=" { SV_KEYWORD(parser::make_TOK_BIT_OR_ASSIGN(out_loc)); }
"&=" { SV_KEYWORD(parser::make_TOK_BIT_AND_ASSIGN(out_loc)); }
"+=" { SV_KEYWORD(parser::make_TOK_ADD_ASSIGN(out_loc)); }
"-=" { SV_KEYWORD(parser::make_TOK_SUB_ASSIGN(out_loc)); }
"^=" { SV_KEYWORD(parser::make_TOK_BIT_XOR_ASSIGN(out_loc)); }
"/=" { SV_KEYWORD(parser::make_TOK_DIV_ASSIGN(out_loc)); }
"%=" { SV_KEYWORD(parser::make_TOK_MOD_ASSIGN(out_loc)); }
"*=" { SV_KEYWORD(parser::make_TOK_MUL_ASSIGN(out_loc)); }
"<<=" { SV_KEYWORD(parser::make_TOK_SHL_ASSIGN(out_loc)); }
">>=" { SV_KEYWORD(parser::make_TOK_SHR_ASSIGN(out_loc)); }
"<<<=" { SV_KEYWORD(parser::make_TOK_SSHL_ASSIGN(out_loc)); }
">>>=" { SV_KEYWORD(parser::make_TOK_SSHR_ASSIGN(out_loc)); }
[-+]?[=*]> {
if (!mode->specify) REJECT;
auto val = std::make_unique<std::string>(YYText());
return parser::make_TOK_SPECIFY_OPER(std::move(val), out_loc);
}
"&&&" {
if (!mode->specify) return parser::make_TOK_IGNORED_SPECIFY_AND(out_loc);
return parser::make_TOK_SPECIFY_AND(out_loc);
}
{UNSIGNED_NUMBER}{TIME_SCALE_SUFFIX} { return parser::make_TOK_TIME_SCALE(out_loc); }
{FIXED_POINT_NUMBER_DEC}{TIME_SCALE_SUFFIX} { return parser::make_TOK_TIME_SCALE(out_loc); }
{FIXED_POINT_NUMBER_NO_DEC}{TIME_SCALE_SUFFIX} { return parser::make_TOK_TIME_SCALE(out_loc); }
<INITIAL,BASED_CONST>"/*" { comment_caller=YY_START; BEGIN(COMMENT); }
<COMMENT>. /* ignore comment body */
<COMMENT>\n /* ignore comment body */
<COMMENT>"*/" { BEGIN(comment_caller); }
<INITIAL,BASED_CONST>[ \t\r\n] /* ignore whitespaces */
<INITIAL,BASED_CONST>\\[\r\n] /* ignore continuation sequence */
<INITIAL,BASED_CONST>"//"[^\r\n]* /* ignore one-line comments */
<INITIAL>. { return char_tok(*YYText(), out_loc); }
<*>. { BEGIN(0); return char_tok(*YYText(), out_loc); }
%%
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