File size: 9,152 Bytes
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import random
import re
from pathlib import Path
from typing import Any, Dict, List, Optional
from src.simulation.base import CoverageBin, SimResult, Simulator
PROTOCOL_BUS_SIGNALS = {
"axi4lite": {"awvalid", "awready", "awaddr", "wvalid", "wready", "wdata",
"bvalid", "bready", "bresp", "arvalid", "arready", "araddr",
"rvalid", "rready", "rdata", "rresp"},
"apb": {"psel", "penable", "paddr", "pwrite", "pwdata", "prdata", "pready", "pslverr"},
"wishbone": {"wb_cyc", "wb_stb", "wb_we", "wb_addr", "wb_data_o", "wb_data_i", "wb_ack"},
"uart": {"tx", "rx", "wb_cyc", "wb_stb", "wb_we", "wb_addr", "wb_data_o", "wb_ack"},
"spi": {"mosi", "miso", "sclk", "ss_n", "wb_cyc", "wb_stb", "wb_we", "wb_addr"},
"i2c": {"scl", "sda", "wb_cyc", "wb_stb", "wb_we", "wb_addr"},
}
class StubSimulator(Simulator):
def __init__(self, work_dir: str = "sim_output", seed: int = 42):
super().__init__(work_dir)
self.rng = random.Random(seed)
self.history: List[Dict[str, Any]] = []
def run(self, files: List[str], top: str = "testbench",
plusargs: Optional[List[str]] = None) -> SimResult:
# Extract seed from plusargs
seed = 42
if plusargs:
for pa in plusargs:
if "+seed=" in pa:
try:
seed = int(pa.split("=")[1])
except (IndexError, ValueError):
pass
self.rng = random.Random(seed)
all_files = self._collect_all_files(files)
bins = self._discover_bins(all_files)
covered = self._simulate_coverage(bins, all_files)
pct = (sum(1 for b in covered if b.covered) / len(covered) * 100) if covered else 0
return SimResult(
passed=pct >= 60,
total_bins=len(covered),
covered_bins=sum(1 for b in covered if b.covered),
bins=covered,
errors=[],
log_output=self._format_log(covered, pct),
seed=seed,
)
def _collect_all_files(self, files: List[str]) -> List[str]:
collected = []
seen = set()
for f in files:
p = Path(f)
if not p.exists():
continue
resolved = str(p.resolve())
if resolved in seen:
continue
seen.add(resolved)
collected.append(resolved)
# Also scan subdirectories (sequences/, rtl/)
for subdir in p.parent.glob("**/*"):
if subdir.is_file() and subdir.suffix in (".sv", ".v", ".vh"):
r = str(subdir.resolve())
if r not in seen:
seen.add(r)
collected.append(r)
return collected
def _discover_bins(self, files: List[str]) -> List[CoverageBin]:
bins_dict: Dict[str, CoverageBin] = {}
all_text = "\n".join(
Path(f).read_text(errors="replace") for f in files if Path(f).exists()
)
# Parse coverpoint bins from generated coverage_collector
for m in re.finditer(r'coverpoint\s+(\w+)\s*\{([^}]+)\}', all_text):
cp_name = m.group(1)
body = m.group(2)
for bm in re.finditer(r'bins\s+(\w+)\s*=', body):
key = f"{cp_name}.{bm.group(1)}"
if key not in bins_dict:
bins_dict[key] = CoverageBin(name=key, hit_count=0, goal=1)
# Parse cross coverage
for m in re.finditer(r'cross\s+(\w+)\s*,\s*(\w+)\s*\{', all_text):
key = f"cross_{m.group(1)}x{m.group(2)}"
if key not in bins_dict:
bins_dict[key] = CoverageBin(name=key, hit_count=0, goal=1)
# Also parse protocol-specific SVAs
for m in re.finditer(r'cover property\s*\([^)]*\)', all_text):
key = f"sva_cover_{len(bins_dict)}"
if key not in bins_dict:
bins_dict[key] = CoverageBin(name=key, hit_count=0, goal=1)
if not bins_dict:
for addr in range(8):
bins_dict[f"bus_cg.ADDR.regs[{addr}]"] = CoverageBin(
f"bus_cg.ADDR.regs[{addr}]", 0, 1)
bins_dict[f"cross_ADRxDIR.addr{addr}_read"] = CoverageBin(
f"cross_ADRxDIR.addr{addr}_read", 0, 1)
bins_dict[f"cross_ADRxDIR.addr{addr}_write"] = CoverageBin(
f"cross_ADRxDIR.addr{addr}_write", 0, 1)
bins_dict["bus_cg.DIR.read"] = CoverageBin("bus_cg.DIR.read", 0, 1)
bins_dict["bus_cg.DIR.write"] = CoverageBin("bus_cg.DIR.write", 0, 1)
return list(bins_dict.values())
def _is_register_hit(self, addr: int, all_text: str) -> bool:
patterns = [
f"reg_addr = 3'h{addr:x}",
f"reg_addr=3'h{addr:x}",
f"wb_addr = 3'h{addr:x}",
f"addr={addr}",
f"target_addr=3'h{addr:x}",
]
return any(p in all_text for p in patterns)
def _simulate_coverage(self, bins: List[CoverageBin],
files: List[str]) -> List[CoverageBin]:
if not files:
return bins
all_text = "\n".join(
Path(f).read_text(errors="replace") for f in files if Path(f).exists()
)
has_write = "item.we = 1" in all_text or "wb_we = 1" in all_text or "pwrite = 1" in all_text
has_read = "item.we = 0" in all_text or "wb_we = 0" in all_text or "pwrite = 0" in all_text
has_any_txn = bool(re.search(r'reg_addr\s*=|wb_addr\s*=|paddr\s*=', all_text))
result = []
for b in bins:
nl = b.name.lower()
hit = 0
goal = b.goal
if "addr" in nl or "regs[" in nl:
for a in range(8):
if self._is_register_hit(a, all_text):
if f"[{a}]" in b.name or f"regs[{a}]" in nl:
hit += 1
if f"addr{a}" in nl:
hit += 1
if hit == 0 and has_any_txn:
for a in range(8):
if f"regs[{a}]" in nl and any(
f"for (int a = {a}" in all_text or f"a == {a}" in all_text
or f"a={a}" in all_text
for _ in [0]
):
hit += 1
elif "read" in nl and ("dir" in nl or "direction" in nl):
hit = 1 if has_read else 0
elif "write" in nl and ("dir" in nl or "direction" in nl):
hit = 1 if has_write else 0
elif "cross" in nl:
if has_write and has_read:
hit = sum(1 for a in range(8) if self._is_register_hit(a, all_text))
hit = min(hit, 8)
elif has_write or has_read:
hit = sum(1 for a in range(8) if self._is_register_hit(a, all_text))
elif "zero" in nl:
hit = 1 if "8'h00" in all_text else 0
elif "ones" in nl:
hit = 1 if "8'hFF" in all_text else 0
elif "pattern" in nl or "data" in nl:
hit = 1 if re.search(r"8'h[0-9A-Fa-f]{2}", all_text) else 0
elif "sva" in nl:
hit = 1 if "assert property" in all_text or "cover property" in all_text else 0
elif "serial" in nl or "uart" in nl or "tx" in nl:
tx_present = "uart_tx" in all_text or ".tx" in all_text
rx_present = "uart_rx" in all_text or ".rx" in all_text
hit = (1 if tx_present else 0) + (1 if rx_present else 0)
goal = 2
elif "spi" in nl or "sclk" in nl or "mosi" in nl:
hit = 1 if any(s in all_text for s in ["mosi", "miso", "sclk", "ss_n"]) else 0
elif "i2c" in nl or "scl" in nl or "sda" in nl:
hit = 1 if "scl" in all_text or "sda" in all_text else 0
else:
hit = 1 if has_any_txn else 0
goal = 1
result.append(CoverageBin(name=b.name, hit_count=hit, goal=goal))
return result
def _format_log(self, bins: List[CoverageBin], pct: float) -> str:
lines = [
"--- Simulation Start ---",
"UVM_INFO @ 0: reporter [RNTST] Running test ...",
]
for b in bins:
status = "HIT" if b.covered else "MISS"
lines.append(f"COVERAGE: {b.name} {b.hit_count}/{b.goal} [{status}]")
covered = sum(1 for b in bins if b.covered)
total = len(bins)
lines.append(f"--- Coverage: {covered}/{total} ({pct:.1f}%) ---")
if covered == total:
lines.append("SCOREBOARD: PASS")
lines.append("UVM Report Summary: Errors: 0")
else:
lines.append("SCOREBOARD: PARTIAL")
lines.append(f"UVM Report Summary: Warnings: {total - covered}")
return "\n".join(lines)
def name(self) -> str:
return "StubSimulator"
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