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
);
// ------------------------------------------------------------------
// State
// ------------------------------------------------------------------
localparam [1:0] S_IDLE = 2'd0,
S_RECV = 2'd1,
S_PREP = 2'd2,
S_EMIT = 2'd3;
reg [1:0] state;
reg [12:0] N; // accepted-byte count (final message length)
reg [12:0] curBi; // current block index being presented
reg [1:0] curLn; // current lane being presented
reg [15:0] nb; // temp: packed next-block {done,bi,ln}
reg [7:0] mem [0:8190]; // stored message bytes in arrival order
// ------------------------------------------------------------------
// Pure combinational helpers (function of N only)
// ------------------------------------------------------------------
// number of accepted bytes routed to a lane
function [12:0] lane_count(input [12:0] n, input [1:0] lane);
reg [12:0] base;
reg [1:0] r;
begin
base = n >> 2; // n / 4
r = n[1:0]; // n % 4
lane_count = base + ((lane < r) ? 13'd1 : 13'd0);
end
endfunction
// number of 8-byte blocks a lane emits given its byte count m
// ceil((m+3)/8) == (m+10)>>3
function [12:0] lane_blocks(input [12:0] m);
lane_blocks = (m + 13'd10) >> 3;
endfunction
// ------------------------------------------------------------------
// Per-lane block counts (combinational from N)
// ------------------------------------------------------------------
wire [12:0] B0 = lane_blocks(lane_count(N, 2'd0));
wire [12:0] B1 = lane_blocks(lane_count(N, 2'd1));
wire [12:0] B2 = lane_blocks(lane_count(N, 2'd2));
wire [12:0] B3 = lane_blocks(lane_count(N, 2'd3));
wire [12:0] maxB = B0; // lane0 always has the most bytes -> most blocks
function [12:0] get_B(input [1:0] lane);
get_B = (lane == 2'd0) ? B0 :
(lane == 2'd1) ? B1 :
(lane == 2'd2) ? B2 : B3;
endfunction
// ------------------------------------------------------------------
// Next block in emission order (index-major, lane-minor, skip empties)
// returns { done(1), bi(13), ln(2) }
// ------------------------------------------------------------------
function [15:0] next_blk(input [12:0] cbi, input [1:0] cln);
reg [12:0] bi;
reg [1:0] ln;
reg done;
reg got;
begin
bi = cbi; ln = cln; done = 1'b0; got = 1'b0;
// same index, next higher lane that still has this block
if (cln < 2'd1 && get_B(2'd1) > cbi) begin ln = 2'd1; got = 1'b1; end
else if (cln < 2'd2 && get_B(2'd2) > cbi) begin ln = 2'd2; got = 1'b1; end
else if (cln < 2'd3 && get_B(2'd3) > cbi) begin ln = 2'd3; got = 1'b1; end
// otherwise advance index; lane0 always has any index < maxB
if (!got) begin
if ((cbi + 13'd1) < maxB) begin bi = cbi + 13'd1; ln = 2'd0; got = 1'b1; end
else done = 1'b1;
end
next_blk = {done, bi, ln};
end
endfunction
// ------------------------------------------------------------------
// Byte value at (lane, block index, position) with padding applied
// ------------------------------------------------------------------
function [7:0] get_byte(input [1:0] lane, input [12:0] bi,
input [2:0] p, input [12:0] n);
reg [12:0] m;
reg [12:0] B;
reg [15:0] len;
reg [13:0] q;
reg [15:0] k;
begin
m = lane_count(n, lane);
B = lane_blocks(m);
len = {m, 3'b000}; // length in bits = m*8
q = ({1'b0, bi} << 3) + {11'b0, p}; // lane byte position
if (q < {1'b0, m}) begin
k = ({3'b0, q} << 2) + {14'b0, lane}; // arrival index = 4*q + lane
get_byte = mem[k];
end else if (bi == (B - 13'd1) && p == 3'd6) begin
get_byte = len[15:8];
end else if (bi == (B - 13'd1) && p == 3'd7) begin
get_byte = len[7:0];
end else if (q == {1'b0, m}) begin
get_byte = 8'h80; // pad marker
end else begin
get_byte = 8'h00;
end
end
endfunction
function [63:0] make_block(input [1:0] lane, input [12:0] bi, input [12:0] n);
make_block = { get_byte(lane, bi, 3'd0, n),
get_byte(lane, bi, 3'd1, n),
get_byte(lane, bi, 3'd2, n),
get_byte(lane, bi, 3'd3, n),
get_byte(lane, bi, 3'd4, n),
get_byte(lane, bi, 3'd5, n),
get_byte(lane, bi, 3'd6, n),
get_byte(lane, bi, 3'd7, n) };
endfunction
// ------------------------------------------------------------------
// Main sequential logic (all outputs registered)
// ------------------------------------------------------------------
always @(posedge clk) begin
if (rst) begin
state <= S_IDLE;
N <= 13'd0;
curBi <= 13'd0;
curLn <= 2'd0;
block_o <= 64'd0;
block_valid_o <= 1'b0;
byte_ready_o <= 1'b1;
done_o <= 1'b0;
busy_o <= 1'b0;
end else begin
case (state)
// ---- waiting for first byte ----
S_IDLE: begin
if (byte_valid_i && byte_ready_o) begin
mem[N] <= byte_i; // N == 0 here
N <= N + 13'd1;
busy_o <= 1'b1;
if (last_i) begin
byte_ready_o <= 1'b0;
state <= S_PREP;
end else begin
state <= S_RECV;
end
end
end
// ---- receiving remaining bytes ----
S_RECV: begin
if (byte_valid_i && byte_ready_o) begin
mem[N] <= byte_i;
N <= N + 13'd1;
if (last_i) begin
byte_ready_o <= 1'b0;
state <= S_PREP;
end
end
end
// ---- one cycle to let mem settle, then present block 0 ----
S_PREP: begin
block_o <= make_block(2'd0, 13'd0, N);
block_valid_o <= 1'b1;
done_o <= next_blk(13'd0, 2'd0) [15];
curBi <= 13'd0;
curLn <= 2'd0;
state <= S_EMIT;
end
// ---- emitting blocks ----
S_EMIT: begin
if (block_valid_o && block_ready_i) begin
if (done_o) begin
// final block accepted -> back to idle
block_valid_o <= 1'b0;
done_o <= 1'b0;
busy_o <= 1'b0;
byte_ready_o <= 1'b1;
N <= 13'd0;
state <= S_IDLE;
end else begin
// advance to next block in emission order
nb = next_blk(curBi, curLn);
curBi <= nb[14:2];
curLn <= nb[1:0];
block_o <= make_block(nb[1:0], nb[14:2], N);
done_o <= next_blk(nb[14:2], nb[1:0]) [15];
end
end
end
endcase
end
end
endmodule
Compile the module with iverilog
iverilog -g2012 -o /tmp/dut.out dut.sv 2>&1 && echo "COMPILE OK"
Exit code 4 dut.sv:179: syntax error dut.sv:179: error: Malformed statement dut.sv:202: syntax error dut.sv:202: error: Malformed statement [error] tool reported failure
/app/dut.sv
S_PREP: begin
block_o <= make_block(2'd0, 13'd0, N);
block_valid_o <= 1'b1;
done_o <= next_blk(13'd0, 2'd0) [15];
curBi <= 13'd0;
curLn <= 2'd0;
state <= S_EMIT;
end S_PREP: begin
nb = next_blk(13'd0, 2'd0);
block_o <= make_block(2'd0, 13'd0, N);
block_valid_o <= 1'b1;
done_o <= nb[15];
curBi <= 13'd0;
curLn <= 2'd0;
state <= S_EMIT;
end/app/dut.sv
reg [15:0] nb; // temp: packed next-block {done,bi,ln} reg [15:0] nb; // temp: packed next-block {done,bi,ln}
reg [15:0] nb2; // temp: packed block after next/app/dut.sv
// advance to next block in emission order
nb = next_blk(curBi, curLn);
curBi <= nb[14:2];
curLn <= nb[1:0];
block_o <= make_block(nb[1:0], nb[14:2], N);
done_o <= next_blk(nb[14:2], nb[1:0]) [15]; // advance to next block in emission order
nb = next_blk(curBi, curLn);
nb2 = next_blk(nb[14:2], nb[1:0]);
curBi <= nb[14:2];
curLn <= nb[1:0];
block_o <= make_block(nb[1:0], nb[14:2], N);
done_o <= nb2[15];Recompile the module
iverilog -g2012 -o /tmp/dut.out dut.sv 2>&1 && echo "COMPILE OK"
COMPILE OK [stdout] COMPILE OK
Run golden model sanity checks
cat > /tmp/golden.py << 'PYEOF'
import random
def lane_count(n, lane):
base = n//4; r = n%4
return base + (1 if lane < r else 0)
def lane_blocks(m):
return (m+3+7)//8 # ceil((m+3)/8)
def lane_block_bytes(msg, lane):
# bytes routed to lane in arrival order
return [msg[k] for k in range(len(msg)) if k%4==lane]
def build_lane_blocks(msg, lane):
m = lane_count(len(msg), lane)
B = lane_blocks(m)
data = lane_block_bytes(msg, lane)
assert len(data)==m
length = m*8
blocks=[]
for bi in range(B):
blk=[]
for p in range(8):
q = bi*8+p
if q < m:
blk.append(data[q])
elif bi==B-1 and p==6:
blk.append((length>>8)&0xff)
elif bi==B-1 and p==7:
blk.append(length&0xff)
elif q==m:
blk.append(0x80)
else:
blk.append(0x00)
blocks.append(blk)
return blocks
def emission(msg):
lanes=[build_lane_blocks(msg,L) for L in range(4)]
Bs=[len(lanes[L]) for L in range(4)]
maxB=max(Bs)
seq=[]
for bi in range(maxB):
for L in range(4):
if bi < Bs[L]:
seq.append((bi,L,lanes[L][bi]))
return seq, Bs
def blk_to_hex(blk):
v=0
for b in blk:
v=(v<<8)|b
return v
# sanity checks against spec examples
def check_example(n, expect_desc):
msg=[ (i*37+11)&0xff for i in range(n)]
seq,Bs=emission(msg)
return seq,Bs,msg
# print a few
for n in [1,2,5,6,7,8,9,16,21,22,64,8191]:
msg=[(i*37+11)&0xff for i in range(n)]
seq,Bs=emission(msg)
print(f"N={n} Bs={Bs} numblocks={len(seq)} final={seq[-1][0:2]}")
PYEOF
python3 /tmp/golden.pyN=1 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=2 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=5 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=6 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=7 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=8 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=9 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=16 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=21 Bs=[2, 1, 1, 1] numblocks=5 final=(1, 0) N=22 Bs=[2, 2, 1, 1] numblocks=6 final=(1, 1) N=64 Bs=[3, 3, 3, 3] numblocks=12 final=(2, 3) N=8191 Bs=[257, 257, 257, 257] numblocks=1028 final=(256, 3) [stdout] N=1 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=2 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=5 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=6 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=7 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=8 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=9 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=16 Bs=[1, 1, 1, 1] numblocks=4 final=(0, 3) N=21 Bs=[2, 1, 1, 1] numblocks=5 final=(1, 0) N=22 Bs=[2, 2, 1, 1] numblocks=6 final=(1, 1) N=64 Bs=[3, 3, 3, 3] numblocks=12 final=(2, 3) N=8191 Bs=[257, 257, 257, 257] numblocks=1028 final=(256, 3)
Generate randomized test vectors
cat >> /tmp/golden.py << 'PYEOF'
def gen_tests():
random.seed(12345)
tests=[]
lens=[1,2,3,4,5,6,7,8,9,15,16,17,21,22,23,24,32,63,64,65,100,255,256,257,1000,8191]
# add randoms
for _ in range(60):
lens.append(random.randint(1,300))
for _ in range(10):
lens.append(random.randint(1,8191))
for n in lens:
msg=[random.randint(0,255) for _ in range(n)]
seq,Bs=emission(msg)
tests.append((msg,[blk_to_hex(b) for (_,_,b) in seq]))
return tests
tests=gen_tests()
with open('/tmp/vectors.txt','w') as f:
f.write(f"{len(tests)}\n")
for msg,blks in tests:
f.write(f"{len(msg)} {len(blks)}\n")
f.write(" ".join(f"{b:02x}" for b in msg)+"\n")
f.write(" ".join(f"{v:016x}" for v in blks)+"\n")
print("wrote", len(tests), "tests")
PYEOF
python3 /tmp/golden.py | tail -1wrote 96 tests [stdout] wrote 96 tests
Compile and run testbench
cat > /tmp/tb.sv << 'TBEOF'
module tb;
reg clk=0, rst=1, start_i=0, byte_valid_i=0, last_i=0, block_ready_i=0;
reg [7:0] byte_i=0;
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;
integer fd, T, t, i;
integer N, K, code;
reg [7:0] msg [0:8191];
reg [63:0] exp [0:2047];
integer errors=0;
integer seed=32'h1234;
// capture accepted blocks
integer accIdx;
reg lastDoneSeen;
integer busyAsserts;
task run_message;
input integer N;
input integer K;
integer bi, bo, guard;
reg [63:0] got;
begin
// ---- byte input phase ----
bi=0;
while (bi < N) begin
// randomly present valid
byte_valid_i = ($random(seed)%3 != 0);
if (byte_valid_i) begin
byte_i = msg[bi];
start_i = (bi==0);
last_i = (bi==N-1);
end else begin
byte_i = $random(seed);
start_i=0; last_i=0;
end
@(posedge clk);
if (byte_valid_i && byte_ready_o) begin
bi = bi + 1;
end
end
byte_valid_i=0; start_i=0; last_i=0;
// ---- block output phase ----
bo=0; guard=0;
while (bo < K) begin
block_ready_i = ($random(seed)%2);
@(posedge clk);
// sample AFTER edge: on this edge, if valid&ready, block accepted
if (block_valid_o && block_ready_i) begin
got = block_o;
if (got !== exp[bo]) begin
errors=errors+1;
$display("TEST fail: block %0d got %h exp %h (N=%0d)", bo, got, exp[bo], N);
end
// done_o must be high exactly on last block
if (bo==K-1) begin
if (!done_o) begin errors=errors+1; $display("done_o low on final block N=%0d",N); end
end else begin
if (done_o) begin errors=errors+1; $display("done_o high on non-final block %0d N=%0d",bo,N); end
end
// during emit, busy high and byte_ready low
if (!busy_o) begin errors=errors+1; $display("busy low during emit N=%0d",N); end
if (byte_ready_o) begin errors=errors+1; $display("byte_ready high during emit N=%0d",N); end
bo=bo+1;
end
guard=guard+1;
if (guard>100000) begin $display("TIMEOUT N=%0d",N); errors=errors+1; bo=K; end
end
block_ready_i=0;
// after final accept, next cycle byte_ready should return high, busy low
@(posedge clk);
if (!byte_ready_o) begin errors=errors+1; $display("byte_ready not restored N=%0d",N); end
if (busy_o) begin errors=errors+1; $display("busy not cleared N=%0d",N); end
if (block_valid_o) begin errors=errors+1; $display("block_valid stuck N=%0d",N); end
end
endtask
initial begin
fd=$fopen("/tmp/vectors.txt","r");
code=$fscanf(fd,"%d\n",T);
// reset
rst=1; @(posedge clk); @(posedge clk); rst=0; @(posedge clk);
if (!byte_ready_o) $display("byte_ready not 1 after reset");
for (t=0; t<T; t=t+1) begin
code=$fscanf(fd,"%d %d\n",N,K);
for (i=0;i<N;i=i+1) code=$fscanf(fd,"%h",msg[i]);
for (i=0;i<K;i=i+1) code=$fscanf(fd,"%h",exp[i]);
run_message(N,K);
end
if (errors==0) $display("ALL %0d TESTS PASSED", T);
else $display("FAILED with %0d errors", errors);
$finish;
end
endmodule
TBEOF
iverilog -g2012 -o /tmp/sim.out /tmp/tb.sv dut.sv 2>&1 && vvp /tmp/sim.out 2>&1 | tail -20No 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_d2d5fb526d6e4d63. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.
Trial trial_d2d5fb526d6e4d63 · verifier authoritative; classifier explanatory.