From 7bfc4ae12030648cd73686d3779c6d412a3c33c0 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Thu, 21 Aug 2014 12:43:51 +0200
Subject: Added Verilog/AST support for DPI functions (dpi_call() still
 unimplemented)

---
 frontends/verilog/lexer.l | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'frontends/verilog/lexer.l')

diff --git a/frontends/verilog/lexer.l b/frontends/verilog/lexer.l
index fdb9bb02..cf51aac8 100644
--- a/frontends/verilog/lexer.l
+++ b/frontends/verilog/lexer.l
@@ -74,6 +74,7 @@ YOSYS_NAMESPACE_END
 %x STRING
 %x SYNOPSYS_TRANSLATE_OFF
 %x SYNOPSYS_FLAGS
+%x IMPORT_DPI
 
 %%
 
@@ -274,6 +275,27 @@ supply1 { return TOK_SUPPLY1; }
 <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>[(),] {
+	return *yytext;
+}
+
+<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;
+}
+
 "\\"[^ \t\r\n]+ {
 	frontend_verilog_yylval.string = new std::string(yytext);
 	return TOK_ID;
-- 
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