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 ++++++++++++++++++++++
 frontends/verilog/parser.y | 33 ++++++++++++++++++++++++++++++++-
 2 files changed, 54 insertions(+), 1 deletion(-)

(limited to 'frontends/verilog')

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;
diff --git a/frontends/verilog/parser.y b/frontends/verilog/parser.y
index acd904e5..1d62bc3b 100644
--- a/frontends/verilog/parser.y
+++ b/frontends/verilog/parser.y
@@ -104,7 +104,7 @@ static void free_attr(std::map<std::string, AstNode*> *al)
 %token TOK_INPUT TOK_OUTPUT TOK_INOUT TOK_WIRE TOK_REG
 %token TOK_INTEGER TOK_SIGNED TOK_ASSIGN TOK_ALWAYS TOK_INITIAL
 %token TOK_BEGIN TOK_END TOK_IF TOK_ELSE TOK_FOR TOK_WHILE TOK_REPEAT
-%token TOK_POSEDGE TOK_NEGEDGE TOK_OR
+%token TOK_DPI_FUNCTION TOK_POSEDGE TOK_NEGEDGE TOK_OR
 %token TOK_CASE TOK_CASEX TOK_CASEZ TOK_ENDCASE TOK_DEFAULT
 %token TOK_FUNCTION TOK_ENDFUNCTION TOK_TASK TOK_ENDTASK
 %token TOK_GENERATE TOK_ENDGENERATE TOK_GENVAR TOK_REAL
@@ -415,6 +415,16 @@ module_body_stmt:
 	always_stmt | TOK_GENERATE module_gen_body TOK_ENDGENERATE | defattr | assert_property;
 
 task_func_decl:
+	attr TOK_DPI_FUNCTION TOK_ID TOK_ID {
+		current_function_or_task = new AstNode(AST_DPI_FUNCTION, AstNode::mkconst_str(*$3));
+		current_function_or_task->str = *$4;
+		append_attr(current_function_or_task, $1);
+		ast_stack.back()->children.push_back(current_function_or_task);
+		delete $3;
+		delete $4;
+	} opt_dpi_function_args ';' {
+		current_function_or_task = NULL;
+	} |
 	attr TOK_TASK TOK_ID ';' {
 		current_function_or_task = new AstNode(AST_TASK);
 		current_function_or_task->str = *$3;
@@ -449,6 +459,27 @@ task_func_decl:
 		ast_stack.pop_back();
 	};
 
+dpi_function_arg:
+	TOK_ID TOK_ID {
+		current_function_or_task->children.push_back(AstNode::mkconst_str(*$1));
+		delete $1;
+		delete $2;
+	} |
+	TOK_ID {
+		current_function_or_task->children.push_back(AstNode::mkconst_str(*$1));
+		delete $1;
+	};
+
+opt_dpi_function_args:
+	'(' dpi_function_args ')' |
+	/* empty */;
+
+dpi_function_args:
+	dpi_function_args ',' dpi_function_arg |
+	dpi_function_args ',' |
+	dpi_function_arg |
+	/* empty */;
+
 opt_signed:
 	TOK_SIGNED {
 		$$ = true;
-- 
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