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gen/fhdl/verilog: revert _printcomb_simulation and _printcomb_regular (needed for icarus simulation) and add Finish command

This commit is contained in:
Florent Kermarrec 2017-09-13 13:46:55 +02:00
parent 2a8f6edded
commit e42ab27f30
2 changed files with 66 additions and 26 deletions
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4
litex/gen/fhdl/structure.py
View File

@ -755,7 +755,11 @@ class _Fragment:
self.clock_domains += other.clock_domains
return self
class Display(_Statement):
def __init__(self, s, *args):
self.s = s
self.args = args
class Finish(_Statement):
pass

88
litex/gen/fhdl/verilog.py
View File

@ -115,9 +115,11 @@ def _printexpr(ns, node):
(_AT_BLOCKING, _AT_NONBLOCKING, _AT_SIGNAL) = range(3)
def _printnode(ns, at, level, node):
if isinstance(node, Display):
s = "\"" + node.s + "\\r\""
def _printnode(ns, at, level, node, target_filter=None):
if target_filter is not None and target_filter not in list_targets(node):
return ""
elif isinstance(node, Display):
s = "\"" + node.s + "\""
for arg in node.args:
s += ", "
if isinstance(arg, Signal):
@ -125,6 +127,8 @@ def _printnode(ns, at, level, node):
else:
s += str(arg)
return "\t"*level + "$display(" + s + ");\n"
elif isinstance(node, Finish):
return "\t"*level + "$finish;\n"
elif isinstance(node, _Assign):
if at == _AT_BLOCKING:
assignment = " = "
@ -136,13 +140,13 @@ def _printnode(ns, at, level, node):
assignment = " <= "
return "\t"*level + _printexpr(ns, node.l)[0] + assignment + _printexpr(ns, node.r)[0] + ";\n"
elif isinstance(node, collections.Iterable):
return "".join(list(map(partial(_printnode, ns, at, level), node)))
return "".join(_printnode(ns, at, level, n, target_filter) for n in node)
elif isinstance(node, If):
r = "\t"*level + "if (" + _printexpr(ns, node.cond)[0] + ") begin\n"
r += _printnode(ns, at, level + 1, node.t)
r += _printnode(ns, at, level + 1, node.t, target_filter)
if node.f:
r += "\t"*level + "end else begin\n"
r += _printnode(ns, at, level + 1, node.f)
r += _printnode(ns, at, level + 1, node.f, target_filter)
r += "\t"*level + "end\n"
return r
elif isinstance(node, Case):
@ -152,11 +156,11 @@ def _printnode(ns, at, level, node):
css = sorted(css, key=lambda x: x[0].value)
for choice, statements in css:
r += "\t"*(level + 1) + _printexpr(ns, choice)[0] + ": begin\n"
r += _printnode(ns, at, level + 2, statements)
r += _printnode(ns, at, level + 2, statements, target_filter)
r += "\t"*(level + 1) + "end\n"
if "default" in node.cases:
r += "\t"*(level + 1) + "default: begin\n"
r += _printnode(ns, at, level + 2, node.cases["default"])
r += _printnode(ns, at, level + 2, node.cases["default"], target_filter)
r += "\t"*(level + 1) + "end\n"
r += "\t"*level + "endcase\n"
return r
@ -238,32 +242,39 @@ def _printheader(f, ios, name, ns, attr_translate,
return r
def _printcomb(f, ns,
display_run,
dummy_signal,
blocking_assign):
def _printcomb_simulation(f, ns,
display_run,
dummy_signal,
blocking_assign):
r = ""
if f.comb:
if dummy_signal:
explanation = """
// Adding a dummy event (using a dummy signal 'dummy_s') to get the simulator
// to run the combinatorial process once at the beginning.
"""
# Generate a dummy event to get the simulator
# to run the combinatorial process once at the beginning.
syn_off = "// synthesis translate_off\n"
syn_on = "// synthesis translate_on\n"
dummy_s = Signal(name_override="dummy_s")
r += explanation
r += syn_off
r += "reg " + _printsig(ns, dummy_s) + ";\n"
r += "initial " + ns.get_name(dummy_s) + " <= 1'd0;\n"
r += syn_on
r += "\n"
from collections import defaultdict
target_stmt_map = defaultdict(list)
for statement in flat_iteration(f.comb):
targets = list_targets(statement)
for t in targets:
target_stmt_map[t].append(statement)
groups = group_by_targets(f.comb)
for n, g in enumerate(groups):
if len(g[1]) == 1 and isinstance(g[1][0], _Assign):
r += "assign " + _printnode(ns, _AT_BLOCKING, 0, g[1][0])
for n, (t, stmts) in enumerate(target_stmt_map.items()):
assert isinstance(t, Signal)
if len(stmts) == 1 and isinstance(stmts[0], _Assign):
r += "assign " + _printnode(ns, _AT_BLOCKING, 0, stmts[0])
else:
if dummy_signal:
dummy_d = Signal(name_override="dummy_d")
@ -274,6 +285,31 @@ def _printcomb(f, ns,
r += "always @(*) begin\n"
if display_run:
r += "\t$display(\"Running comb block #" + str(n) + "\");\n"
if blocking_assign:
r += "\t" + ns.get_name(t) + " = " + _printexpr(ns, t.reset)[0] + ";\n"
r += _printnode(ns, _AT_BLOCKING, 1, stmts, t)
else:
r += "\t" + ns.get_name(t) + " <= " + _printexpr(ns, t.reset)[0] + ";\n"
r += _printnode(ns, _AT_NONBLOCKING, 1, stmts, t)
if dummy_signal:
r += syn_off
r += "\t" + ns.get_name(dummy_d) + " = " + ns.get_name(dummy_s) + ";\n"
r += syn_on
r += "end\n"
r += "\n"
return r
def _printcomb_regular(f, ns, blocking_assign):
r = ""
if f.comb:
groups = group_by_targets(f.comb)
for n, g in enumerate(groups):
if len(g[1]) == 1 and isinstance(g[1][0], _Assign):
r += "assign " + _printnode(ns, _AT_BLOCKING, 0, g[1][0])
else:
r += "always @(*) begin\n"
if blocking_assign:
for t in g[0]:
r += "\t" + ns.get_name(t) + " = " + _printexpr(ns, t.reset)[0] + ";\n"
@ -282,10 +318,6 @@ def _printcomb(f, ns,
for t in g[0]:
r += "\t" + ns.get_name(t) + " <= " + _printexpr(ns, t.reset)[0] + ";\n"
r += _printnode(ns, _AT_NONBLOCKING, 1, g[1])
if dummy_signal:
r += syn_off
r += "\t" + ns.get_name(dummy_d) + " <= " + ns.get_name(dummy_s) + ";\n"
r += syn_on
r += "end\n"
r += "\n"
return r
@ -368,7 +400,11 @@ def convert(f, ios=None, name="top",
src = "/* Machine-generated using LiteX gen */\n"
src += _printheader(f, ios, name, ns, attr_translate,
reg_initialization=reg_initialization)
src += _printcomb(f, ns,
if regular_comb:
src += _printcomb_regular(f, ns,
blocking_assign=blocking_assign)
else:
src += _printcomb_simulation(f, ns,
display_run=display_run,
dummy_signal=dummy_signal,
blocking_assign=blocking_assign)