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// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2008 by Wilson Snyder.
// SPDX-License-Identifier: CC0-1.0
module t (/*AUTOARG*/
// Inputs
clk
);
input clk;
reg toggle;
initial toggle=0;
integer cyc;
initial cyc=1;
wire [7:0] cyc_copy = cyc[7:0];
alpha a1 (/*AUTOINST*/
// Inputs
.clk (clk),
.toggle (toggle));
alpha a2 (/*AUTOINST*/
// Inputs
.clk (clk),
.toggle (toggle));
beta b1 (/*AUTOINST*/
// Inputs
.clk (clk),
.toggle (toggle));
beta b2 (/*AUTOINST*/
// Inputs
.clk (clk),
.toggle (toggle));
tsk t1 (/*AUTOINST*/
// Inputs
.clk (clk),
.toggle (toggle));
off o1 (/*AUTOINST*/
// Inputs
.clk (clk),
.toggle (toggle));
tab tab1 (/*AUTOINST*/
// Inputs
.clk (clk));
par par1 (/*AUTOINST*/);
always @ (posedge clk) begin
if (cyc!=0) begin
cyc <= cyc + 1;
toggle <= '0;
// Single and multiline if
if (cyc==3) $write("");
if (cyc==3)
begin
$write("");
end
// Single and multiline else
if (cyc==3) ; else $write("");
if (cyc==3) ;
else
begin
$write("");
end
// Single and multiline if else
if (cyc==3) $write(""); else $write("");
if (cyc==3)
begin
$write("");
end
else
begin
$write("");
end
// multiline elseif
if (cyc==3)
begin
$write("");
end
else if (cyc==4)
begin
$write("");
end
else if (cyc==5)
begin
$write("");
end
else
begin
$write("");
end
// Single and multiline while
while (0);
while (0) begin
$write("");
end
do ; while (0);
do begin
$write("");
end while (0);
//===
// Task and complicated
if (cyc==3) begin
toggle <= '1;
end
else if (cyc==5) begin
`ifdef VERILATOR
$c("this->call_task();");
`else
call_task();
`endif
end
else if (cyc==10) begin
$write("*-* All Finished *-*\n");
$finish;
end
end
end
task call_task;
/* verilator public */
t1.center_task(1'b1);
endtask
endmodule
module alpha (/*AUTOARG*/
// Inputs
clk, toggle
);
input clk;
input toggle;
always @ (posedge clk) begin
if (toggle) begin // CHECK_COVER(0,"top.t.a*",18)
$write("");
// t.a1 and t.a2 collapse to a count of 2
end
if (toggle) begin // *** t_cover_line.vlt turns this off
$write(""); // CHECK_COVER_MISSING(0)
// This doesn't even get added
`ifdef ATTRIBUTE
// verilator coverage_block_off
`endif
end
end
endmodule
module beta (/*AUTOARG*/
// Inputs
clk, toggle
);
input clk;
input toggle;
/* verilator public_module */
always @ (posedge clk) begin
$write(""); // Always covered
if (0) begin // CHECK_COVER(0,"top.t.b*",0)
// Make sure that we don't optimize away zero buckets
$write("");
end
if (toggle) begin // CHECK_COVER(0,"top.t.b*",2)
// t.b1 and t.b2 collapse to a count of 2
$write("");
end
if (toggle) begin : block
// This doesn't
`ifdef ATTRIBUTE
// verilator coverage_block_off
`endif
begin end // *** t_cover_line.vlt turns this off (so need begin/end)
if (1) begin end // CHECK_COVER_MISSING(0)
$write(""); // CHECK_COVER_MISSING(0)
end
end
endmodule
class Cls;
bit m_toggle;
function new(bit toggle);
m_toggle = toggle;
if (m_toggle) begin // CHECK_COVER(0,"top.$unit::Cls",1)
$write("");
end
endfunction
static function void fstatic(bit toggle);
if (1) begin // CHECK_COVER(0,"top.$unit::Cls",1)
$write("");
end
endfunction
function void fauto();
if (m_toggle) begin // CHECK_COVER(0,"top.$unit::Cls",11)
$write("");
end
endfunction
endclass
module tsk (/*AUTOARG*/
// Inputs
clk, toggle
);
input clk;
input toggle;
/* verilator public_module */
always @ (posedge clk) begin
center_task(1'b0);
end
task center_task;
input external;
begin
if (toggle) begin // CHECK_COVER(0,"top.t.t1",1)
$write("");
end
if (external) begin // CHECK_COVER(0,"top.t.t1",1)
$write("[%0t] Got external pulse\n", $time);
end
end
begin
Cls c = new(1'b1);
c.fauto();
Cls::fstatic(1'b1);
end
endtask
endmodule
module off (/*AUTOARG*/
// Inputs
clk, toggle
);
input clk;
input toggle;
// verilator coverage_off
always @ (posedge clk) begin
if (toggle) begin
$write(""); // CHECK_COVER_MISSING(0)
// because under coverage_module_off
end
end
// verilator coverage_on
always @ (posedge clk) begin
if (toggle) begin
// because under coverage_module_off
$write("");
if (0) ; // CHECK_COVER(0,"top.t.o1",1)
end
end
endmodule
module tab (input clk);
bit [3:0] cyc4;
int decoded;
always @ (posedge clk) begin
case (cyc4)
1: decoded = 10;
2: decoded = 20;
3: decoded = 30;
4: decoded = 40;
5: decoded = 50;
default: decoded = 0;
endcase
end
always @ (posedge clk) begin
cyc4 <= cyc4 + 1;
end
endmodule
module par();
localparam int CALLS_FUNC = param_func(1);
// We don't currently count elaboration time use towards coverage. This
// seems safer for functions used both at elaboration time and not - but may
// revisit this.
function automatic int param_func(int i);
if (i == 0) begin
i = 99; // Uncovered
end
else begin
i = i + 1;
end
return i;
endfunction
endmodule
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