tests/test.sh exit code (0 → resolved); the classification below is post-hoc and cannot change it.module TopModule (
input wire clk,
input wire rst,
input wire start_i,
input wire [7:0] byte_i,
input wire byte_valid_i,
input wire last_i,
input wire block_ready_i,
output reg [63:0] block_o,
output reg block_valid_o,
output reg byte_ready_o,
output reg done_o,
output reg busy_o
);
// ---------------------------------------------------------------
// States
// ---------------------------------------------------------------
localparam [1:0] S_IDLE = 2'd0;
localparam [1:0] S_RECV = 2'd1;
localparam [1:0] S_EMIT = 2'd2;
reg [1:0] state;
// Per-lane data storage (max lane length 2048 bytes)
reg [7:0] mem [0:3][0:2047];
// Per-lane byte counts
reg [12:0] lane_len [0:3];
// Receive-side rotating lane pointer
reg [1:0] recv_lane;
// Emission pointer
reg [1:0] cur_lane;
reg [8:0] cur_i;
// ---------------------------------------------------------------
// Number of blocks for a lane of L bytes: floor((L+10)/8)
// ---------------------------------------------------------------
function automatic [8:0] calcN(input [12:0] L);
begin
calcN = (L + 13'd10) >> 3;
end
endfunction
// Combinational lane block counts (valid/stable while emitting)
wire [8:0] N0 = calcN(lane_len[0]);
wire [8:0] N1 = calcN(lane_len[1]);
wire [8:0] N2 = calcN(lane_len[2]);
wire [8:0] N3 = calcN(lane_len[3]);
// Max block count is lane0 (lengths are non-increasing)
wire [8:0] maxN = N0;
wire [8:0] maxN_m1 = N0 - 9'd1;
// Highest-numbered lane that reaches the max index
wire [1:0] final_lane = (N3 == N0) ? 2'd3 :
(N2 == N0) ? 2'd2 :
(N1 == N0) ? 2'd1 : 2'd0;
// Block count of lane (cur_lane+1), used to test prefix continuation
wire [8:0] Nnext = (cur_lane == 2'd0) ? N1 :
(cur_lane == 2'd1) ? N2 : N3;
// ---------------------------------------------------------------
// Build a block for (lane, idx) from committed memory / lengths
// ---------------------------------------------------------------
function automatic [63:0] build_block(input [1:0] lane, input [8:0] idx);
reg [12:0] L;
reg [8:0] nb;
reg [12:0] nb8;
reg [15:0] lenb;
reg [63:0] blk;
reg [12:0] gp;
reg [7:0] bv;
integer b;
begin
L = lane_len[lane];
nb = calcN(L);
nb8 = {nb, 3'b000};
lenb = {L, 3'b000};
blk = 64'b0;
for (b = 0; b < 8; b = b + 1) begin
gp = ({idx, 3'b000}) + b[12:0];
if (gp < L)
bv = mem[lane][gp[10:0]];
else if (gp == L)
bv = 8'h80;
else if (gp == (nb8 - 13'd2))
bv = lenb[15:8];
else if (gp == (nb8 - 13'd1))
bv = lenb[7:0];
else
bv = 8'h00;
blk[(7-b)*8 +: 8] = bv;
end
build_block = blk;
end
endfunction
// ---------------------------------------------------------------
// Build block (0,0) at the transition edge, substituting the
// just-accepted last byte if it lands in lane 0's first block.
// ---------------------------------------------------------------
function automatic [63:0] build_trans;
reg [12:0] L0;
reg [12:0] wpos;
reg [8:0] nb;
reg [12:0] nb8;
reg [15:0] lenb;
reg [63:0] blk;
reg [12:0] gp;
reg [7:0] bv;
integer b;
begin
L0 = lane_len[0] + ((recv_lane == 2'd0) ? 13'd1 : 13'd0);
wpos = lane_len[0];
nb = calcN(L0);
nb8 = {nb, 3'b000};
lenb = {L0, 3'b000};
blk = 64'b0;
for (b = 0; b < 8; b = b + 1) begin
gp = b[12:0];
if (gp < L0) begin
if ((recv_lane == 2'd0) && (gp == wpos))
bv = byte_i;
else
bv = mem[0][gp[10:0]];
end
else if (gp == L0)
bv = 8'h80;
else if (gp == (nb8 - 13'd2))
bv = lenb[15:8];
else if (gp == (nb8 - 13'd1))
bv = lenb[7:0];
else
bv = 8'h00;
blk[(7-b)*8 +: 8] = bv;
end
build_trans = blk;
end
endfunction
// ---------------------------------------------------------------
// Main sequential logic (all outputs registered)
// ---------------------------------------------------------------
always @(posedge clk) begin : main
reg [1:0] nl;
reg [8:0] ni;
if (rst) begin
state <= S_IDLE;
block_o <= 64'b0;
block_valid_o <= 1'b0;
byte_ready_o <= 1'b1;
done_o <= 1'b0;
busy_o <= 1'b0;
lane_len[0] <= 13'd0;
lane_len[1] <= 13'd0;
lane_len[2] <= 13'd0;
lane_len[3] <= 13'd0;
recv_lane <= 2'd0;
cur_lane <= 2'd0;
cur_i <= 9'd0;
end else begin
case (state)
// ---------------------------------------------------
S_IDLE: begin
if (byte_valid_i && byte_ready_o) begin
// First accepted byte -> lane 0
mem[0][0] <= byte_i;
lane_len[0] <= 13'd1;
recv_lane <= 2'd1;
busy_o <= 1'b1;
if (last_i) begin
// Single-byte message: go straight to emit
state <= S_EMIT;
byte_ready_o <= 1'b0;
block_valid_o <= 1'b1;
done_o <= 1'b0;
cur_lane <= 2'd0;
cur_i <= 9'd0;
block_o <= build_trans();
end else begin
state <= S_RECV;
end
end
end
// ---------------------------------------------------
S_RECV: begin
if (byte_valid_i && byte_ready_o) begin
mem[recv_lane][lane_len[recv_lane][10:0]] <= byte_i;
lane_len[recv_lane] <= lane_len[recv_lane] + 13'd1;
recv_lane <= (recv_lane == 2'd3) ? 2'd0 : (recv_lane + 2'd1);
if (last_i) begin
state <= S_EMIT;
byte_ready_o <= 1'b0;
block_valid_o <= 1'b1;
done_o <= 1'b0;
cur_lane <= 2'd0;
cur_i <= 9'd0;
block_o <= build_trans();
end
end
end
// ---------------------------------------------------
S_EMIT: begin
if (block_valid_o && block_ready_i) begin
if ((cur_lane == final_lane) && (cur_i == maxN_m1)) begin
// Final block accepted: finish
state <= S_IDLE;
block_valid_o <= 1'b0;
done_o <= 1'b0;
busy_o <= 1'b0;
byte_ready_o <= 1'b1;
lane_len[0] <= 13'd0;
lane_len[1] <= 13'd0;
lane_len[2] <= 13'd0;
lane_len[3] <= 13'd0;
recv_lane <= 2'd0;
cur_lane <= 2'd0;
cur_i <= 9'd0;
end else begin
// Advance to the next slot
if ((cur_lane < 2'd3) && (cur_i < Nnext)) begin
nl = cur_lane + 2'd1;
ni = cur_i;
end else begin
nl = 2'd0;
ni = cur_i + 9'd1;
end
cur_lane <= nl;
cur_i <= ni;
block_o <= build_block(nl, ni);
done_o <= ((nl == final_lane) && (ni == maxN_m1));
end
end
end
// ---------------------------------------------------
default: state <= S_IDLE;
endcase
end
end
endmodule
Syntax-check dut.sv with iverilog
iverilog -g2012 -o /tmp/dut_syntax.out dut.sv 2>&1 && echo "COMPILE OK"
COMPILE OK [stdout] COMPILE OK
module tb;
reg clk, rst, start_i, byte_valid_i, last_i, block_ready_i;
reg [7:0] byte_i;
wire [63:0] block_o;
wire block_valid_o, byte_ready_o, done_o, busy_o;
TopModule dut(.clk(clk), .rst(rst), .start_i(start_i), .byte_i(byte_i),
.byte_valid_i(byte_valid_i), .last_i(last_i), .block_ready_i(block_ready_i),
.block_o(block_o), .block_valid_o(block_valid_o), .byte_ready_o(byte_ready_o),
.done_o(done_o), .busy_o(busy_o));
always #5 clk = ~clk;
// ---- golden expected block sequence storage ----
reg [63:0] exp_blk [0:5000];
reg exp_done [0:5000];
integer exp_n;
// message bytes
reg [7:0] msg [0:8191];
integer msglen;
integer seed;
integer errors;
// per-lane byte store for golden
reg [7:0] lmem [0:3][0:2047];
integer llen [0:3];
task compute_golden;
integer i, r, N[0:3], maxN, flane, idx, lane, b, gp, L, nb, valid_lanes;
reg [15:0] lenb;
reg [63:0] blk;
begin
llen[0]=0; llen[1]=0; llen[2]=0; llen[3]=0;
for (i=0;i<msglen;i=i+1) begin
r = i % 4;
lmem[r][llen[r]] = msg[i];
llen[r] = llen[r]+1;
end
for (r=0;r<4;r=r+1) N[r] = (llen[r]+10)/8;
maxN = N[0];
flane = (N[3]==N[0])?3:(N[2]==N[0])?2:(N[1]==N[0])?1:0;
exp_n = 0;
for (idx=0; idx<maxN; idx=idx+1) begin
for (lane=0; lane<4; lane=lane+1) begin
if (idx < N[lane]) begin
L = llen[lane];
nb = N[lane];
lenb = L*8;
blk = 0;
for (b=0;b<8;b=b+1) begin
gp = idx*8+b;
if (gp < L) blk[(7-b)*8 +: 8] = lmem[lane][gp];
else if (gp == L) blk[(7-b)*8 +: 8] = 8'h80;
else if (gp == nb*8-2) blk[(7-b)*8 +: 8] = lenb[15:8];
else if (gp == nb*8-1) blk[(7-b)*8 +: 8] = lenb[7:0];
else blk[(7-b)*8 +: 8] = 8'h00;
end
exp_blk[exp_n] = blk;
exp_done[exp_n] = ((lane==flane) && (idx==maxN-1)) ? 1'b1 : 1'b0;
exp_n = exp_n+1;
end
end
end
end
endtask
integer got_idx;
integer busy_seen;
task run_message(input integer len);
integer i;
begin
msglen = len;
for (i=0;i<len;i=i+1) msg[i] = $random(seed);
compute_golden;
got_idx = 0;
// drive bytes
i = 0;
while (i < len) begin
// random gap: sometimes deassert valid
if (($random(seed)%3)==0) begin
byte_valid_i = 0; byte_i = 8'hxx; start_i=0; last_i=0;
@(posedge clk);
end else begin
byte_valid_i = 1;
byte_i = msg[i];
start_i = (i==0);
last_i = (i==len-1);
@(posedge clk);
if (byte_ready_o) begin
i = i+1;
end
end
end
byte_valid_i = 0; start_i=0; last_i=0; byte_i=8'hxx;
// now drain blocks with random stalls until all expected consumed
while (got_idx < exp_n) begin
block_ready_i = ($random(seed)%2);
@(posedge clk);
if (block_valid_o && block_ready_i) begin
if (block_o !== exp_blk[got_idx]) begin
$display("BLOCK MISMATCH len=%0d idx=%0d got=%h exp=%h", len, got_idx, block_o, exp_blk[got_idx]);
errors = errors+1;
end
if (done_o !== exp_done[got_idx]) begin
$display("DONE MISMATCH len=%0d idx=%0d got=%b exp=%b", len, got_idx, done_o, exp_done[got_idx]);
errors = errors+1;
end
got_idx = got_idx+1;
end
end
block_ready_i = 0;
@(posedge clk);
// after final accept, busy should drop, byte_ready high
if (busy_o !== 1'b0) begin $display("BUSY not low after len=%0d", len); errors=errors+1; end
if (byte_ready_o !== 1'b1) begin $display("READY not high after len=%0d", len); errors=errors+1; end
end
endtask
integer t, ln;
initial begin
clk=0; rst=1; start_i=0; byte_valid_i=0; last_i=0; block_ready_i=0; byte_i=0;
seed=32'h12345;
errors=0;
@(posedge clk); @(posedge clk);
rst=0;
@(posedge clk);
// directed small lengths
for (ln=1; ln<=40; ln=ln+1) run_message(ln);
// boundary lengths around multiples of 8 and 32
run_message(64); run_message(63); run_message(65);
run_message(8191); run_message(8190);
// random lengths
for (t=0;t<60;t=t+1) begin
ln = ($random(seed) % 500);
if (ln < 1) ln = 1;
run_message(ln);
end
if (errors==0) $display("ALL TESTS PASSED");
else $display("TESTS FAILED: %0d errors", errors);
$finish;
end
// watchdog
initial begin
#50000000;
$display("TIMEOUT");
$finish;
end
endmodule
Compile and run testbench
cd /tmp && iverilog -g2012 -o /tmp/sim.out /app/dut.sv /tmp/tb.sv 2>&1 && vvp /tmp/sim.out 2>&1 | tail -40
TIMEOUT /tmp/tb.sv:152: $finish called at 50000000 (1s) Shell cwd was reset to /app [stdout] TIMEOUT /tmp/tb.sv:152: $finish called at 50000000 (1s) [stderr] Shell cwd was reset to /app
module tb;
reg clk, rst, start_i, byte_valid_i, last_i, block_ready_i;
reg [7:0] byte_i;
wire [63:0] block_o;
wire block_valid_o, byte_ready_o, done_o, busy_o;
TopModule dut(.clk(clk), .rst(rst), .start_i(start_i), .byte_i(byte_i),
.byte_valid_i(byte_valid_i), .last_i(last_i), .block_ready_i(block_ready_i),
.block_o(block_o), .block_valid_o(block_valid_o), .byte_ready_o(byte_ready_o),
.done_o(done_o), .busy_o(busy_o));
always #5 clk = ~clk;
reg [63:0] exp_blk [0:5000];
reg exp_done [0:5000];
integer exp_n;
reg [7:0] msg [0:8191];
integer msglen;
integer seed;
integer errors;
reg [7:0] lmem [0:3][0:2047];
integer llen [0:3];
task compute_golden;
integer i, r, N[0:3], maxN, flane, idx, lane, b, gp, L, nb;
reg [15:0] lenb;
reg [63:0] blk;
begin
llen[0]=0; llen[1]=0; llen[2]=0; llen[3]=0;
for (i=0;i<msglen;i=i+1) begin
r = i % 4;
lmem[r][llen[r]] = msg[i];
llen[r] = llen[r]+1;
end
for (r=0;r<4;r=r+1) N[r] = (llen[r]+10)/8;
maxN = N[0];
flane = (N[3]==N[0])?3:(N[2]==N[0])?2:(N[1]==N[0])?1:0;
exp_n = 0;
for (idx=0; idx<maxN; idx=idx+1) begin
for (lane=0; lane<4; lane=lane+1) begin
if (idx < N[lane]) begin
L = llen[lane];
nb = N[lane];
lenb = L*8;
blk = 0;
for (b=0;b<8;b=b+1) begin
gp = idx*8+b;
if (gp < L) blk[(7-b)*8 +: 8] = lmem[lane][gp];
else if (gp == L) blk[(7-b)*8 +: 8] = 8'h80;
else if (gp == nb*8-2) blk[(7-b)*8 +: 8] = lenb[15:8];
else if (gp == nb*8-1) blk[(7-b)*8 +: 8] = lenb[7:0];
else blk[(7-b)*8 +: 8] = 8'h00;
end
exp_blk[exp_n] = blk;
exp_done[exp_n] = ((lane==flane) && (idx==maxN-1)) ? 1'b1 : 1'b0;
exp_n = exp_n+1;
end
end
end
end
endtask
integer got_idx;
task run_message(input integer len);
integer i;
reg accepted;
reg [63:0] capt_blk;
reg capt_done, capt_bvalid;
begin
msglen = len;
for (i=0;i<len;i=i+1) msg[i] = $random(seed);
compute_golden;
got_idx = 0;
i = 0;
while (i < len) begin
if (($random(seed)%3)==0) begin
byte_valid_i = 0; byte_i = 8'hxx; start_i=0; last_i=0;
@(posedge clk);
end else begin
byte_valid_i = 1;
byte_i = msg[i];
start_i = (i==0);
last_i = (i==len-1);
@(negedge clk);
accepted = byte_ready_o;
@(posedge clk);
if (accepted) i = i+1;
end
end
byte_valid_i = 0; start_i=0; last_i=0; byte_i=8'hxx;
while (got_idx < exp_n) begin
block_ready_i = ($random(seed)%2);
@(negedge clk);
capt_bvalid = block_valid_o;
accepted = block_valid_o && block_ready_i;
capt_blk = block_o;
capt_done = done_o;
@(posedge clk);
if (accepted) begin
if (capt_blk !== exp_blk[got_idx]) begin
$display("BLOCK MISMATCH len=%0d idx=%0d got=%h exp=%h", len, got_idx, capt_blk, exp_blk[got_idx]);
errors = errors+1;
end
if (capt_done !== exp_done[got_idx]) begin
$display("DONE MISMATCH len=%0d idx=%0d got=%b exp=%b", len, got_idx, capt_done, exp_done[got_idx]);
errors = errors+1;
end
got_idx = got_idx+1;
end
end
block_ready_i = 0;
@(posedge clk);
if (busy_o !== 1'b0) begin $display("BUSY not low after len=%0d", len); errors=errors+1; end
if (byte_ready_o !== 1'b1) begin $display("READY not high after len=%0d", len); errors=errors+1; end
end
endtask
integer t, ln;
initial begin
clk=0; rst=1; start_i=0; byte_valid_i=0; last_i=0; block_ready_i=0; byte_i=0;
seed=32'h12345;
errors=0;
@(posedge clk); @(posedge clk);
rst=0;
@(posedge clk);
for (ln=1; ln<=48; ln=ln+1) run_message(ln);
run_message(64); run_message(63); run_message(65);
run_message(8191); run_message(8190); run_message(8189);
for (t=0;t<80;t=t+1) begin
ln = ($random(seed) % 600);
if (ln < 1) ln = 1;
run_message(ln);
end
if (errors==0) $display("ALL TESTS PASSED");
else $display("TESTS FAILED: %0d errors", errors);
$finish;
end
initial begin
#200000000;
$display("TIMEOUT");
$finish;
end
endmodule
Recompile and run fixed testbench
cd /tmp && iverilog -g2012 -o /tmp/sim.out /app/dut.sv /tmp/tb.sv 2>&1 && vvp /tmp/sim.out 2>&1 | tail -40
No file changes, the agent left the workspace untouched.
FAIL: tampered GRADER_HOME/runtime detected -> failing closed (score 0)
Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_c2dcc1a6475d4f99. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.
Trial trial_c2dcc1a6475d4f99 · verifier authoritative; classifier explanatory.