sv: support tasks and functions within packages

frontends/ast/ast.cc

@@ -1196,6 +1196,25 @@ static void process_module(RTLIL::Design *design, AstNode *ast, bool defer, AstN
 	design->add(current_module);
 }
 
+// renames identifiers in tasks and functions within a package
+static void rename_in_package_stmts(AstNode *pkg)
+{
+	std::unordered_set<std::string> idents;
+	for (AstNode *item : pkg->children)
+		idents.insert(item->str);
+	std::function<void(AstNode*)> rename =
+		[&rename, &idents, pkg](AstNode *node) {
+			for (AstNode *child : node->children) {
+				if (idents.count(child->str))
+					child->str = pkg->str + "::" + child->str.substr(1);
+				rename(child);
+			}
+	};
+	for (AstNode *item : pkg->children)
+		if (item->type == AST_FUNCTION || item->type == AST_TASK)
+			rename(item);
+}
+
 // create AstModule instances for all modules in the AST tree and add them to 'design'
 void AST::process(RTLIL::Design *design, AstNode *ast, bool dump_ast1, bool dump_ast2, bool no_dump_ptr, bool dump_vlog1, bool dump_vlog2, bool dump_rtlil,
 		bool nolatches, bool nomeminit, bool nomem2reg, bool mem2reg, bool noblackbox, bool lib, bool nowb, bool noopt, bool icells, bool pwires, bool nooverwrite, bool overwrite, bool defer, bool autowire)
@@ -1284,6 +1303,7 @@ void AST::process(RTLIL::Design *design, AstNode *ast, bool dump_ast1, bool dump
 		else if (child->type == AST_PACKAGE) {
 			// process enum/other declarations
 			child->simplify(true, false, false, 1, -1, false, false);
+			rename_in_package_stmts(child);
 			design->verilog_packages.push_back(child->clone());
 			current_scope.clear();
 		}

frontends/ast/simplify.cc

@@ -875,7 +875,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
 		for (size_t i = 0; i < children.size(); i++) {
 			AstNode *node = children[i];
 			// these nodes appear at the top level in a package and can define names
-			if (node->type == AST_PARAMETER || node->type == AST_LOCALPARAM || node->type == AST_TYPEDEF) {
+			if (node->type == AST_PARAMETER || node->type == AST_LOCALPARAM || node->type == AST_TYPEDEF || node->type == AST_FUNCTION || node->type == AST_TASK) {
 				current_scope[node->str] = node;
 			}
 			if (node->type == AST_ENUM) {

frontends/verilog/verilog_parser.y

@@ -593,7 +593,7 @@ package_body:
 	package_body package_body_stmt | %empty;
 
 package_body_stmt:
-	typedef_decl | localparam_decl | param_decl;
+	typedef_decl | localparam_decl | param_decl | task_func_decl;
 
 interface:
 	TOK_INTERFACE {

tests/verilog/package_task_func.sv

@@ -0,0 +1,30 @@
+package P;
+    localparam Y = 2;
+    localparam X = Y + 1;
+    task t;
+        output integer x;
+        x = Y;
+    endtask
+    function automatic integer f;
+        input integer i;
+        f = i * X;
+    endfunction
+    function automatic integer g;
+        input integer i;
+        g = i == 0 ? 1 : Y * g(i - 1);
+    endfunction
+    localparam Z = g(4);
+endpackage
+
+module top;
+    integer a;
+    initial P::t(a);
+    integer b = P::f(3);
+    integer c = P::g(3);
+    integer d = P::Z;
+
+    assert property (a == 2);
+    assert property (b == 9);
+    assert property (c == 8);
+    assert property (d == 16);
+endmodule

tests/verilog/package_task_func.ys

@@ -0,0 +1,4 @@
+read_verilog -sv package_task_func.sv
+proc
+opt -full
+sat -verify -seq 1 -prove-asserts -show-all