Implement SV structs.

tests/svtypes/struct_simple.sv

@@ -0,0 +1,39 @@
+module top;
+	localparam BITS=8;
+
+	struct packed {
+		logic a;
+		logic[BITS-1:0] b;
+		byte c;
+		logic x, y;
+	} s;
+
+	struct packed signed { 
+		integer a;
+		logic[15:0] b;
+		logic[7:0] c;
+		bit [7:0] d;
+	} pack1;
+
+	assign s.a = '1;
+	assign s.b = '1;
+	assign s.c = 8'hAA;
+	assign s.x = '1;
+	logic[7:0] t;
+	assign t = s.b;
+	assign pack1.a = 42;
+	assign pack1.b = 16'hAAAA;
+	assign pack1.c = '1;
+	assign pack1.d = 8'h55;
+
+	always_comb assert(s.a == 1'b1);
+	always_comb assert(s.c == 8'hAA);
+	always_comb assert(s.x == 1'b1);
+	always_comb assert(t == 8'hFF);
+	always_comb assert(pack1.a == 42);
+	always_comb assert(pack1.b == 16'hAAAA);
+	always_comb assert(pack1.c == 8'hFF);
+	always_comb assert(pack1[15:8] == 8'hFF);
+	always_comb assert(pack1.d == 8'h55);
+
+endmodule

tests/svtypes/typedef_struct.sv

@@ -0,0 +1,42 @@
+package p;
+
+typedef struct packed {
+	byte a;
+	byte b;
+} p_t;
+
+endpackage
+
+
+module top;
+
+	typedef logic[7:0] t_t;
+
+	typedef struct packed {
+		bit		a;
+		logic[7:0]	b;
+		t_t		t;
+	} s_t;
+
+	s_t s;
+	s_t s1;
+
+	p::p_t ps;
+
+	assign s.a = '1;
+	assign s.b = '1;
+	assign s.t = 8'h55;
+	assign s1 = s;
+	assign ps.a = 8'hAA;
+	assign ps.b = 8'h55;
+
+	always_comb begin
+		assert(s.a == 1'b1);
+		assert(s.b == 8'hFF);
+		assert(s.t == 8'h55);
+		assert(s1.t == 8'h55);
+		assert(ps.a == 8'hAA);
+		assert(ps.b == 8'h55);
+	end
+
+endmodule