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Use [[maybe_unused]] instead of YS_ATTRIBUTE(unused).

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[[maybe_unused]] is available since C++17, so this commit adds
a polyfill YS_MAYBE_UNUSED. Once we require C++17 we can drop it.
This commit is contained in:
whitequark 2020-06-19 15:45:52 +00:00
parent 118e4caa37
commit c8c3c7af87
2 changed files with 18 additions and 10 deletions
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8
kernel/yosys.h
View file

@ -144,6 +144,14 @@ extern Tcl_Obj *Tcl_ObjSetVar2(Tcl_Interp *interp, Tcl_Obj *part1Ptr, Tcl_Obj *p
# define YS_ATTRIBUTE(...)
#endif
#if __cplusplus >= 201703L
# define YS_MAYBE_UNUSED [[maybe_unused]];
#elif defined(__GNUC__) || defined(__clang__)
# define YS_MAYBE_UNUSED __attribute__((__unused__))
#else
# define YS_MAYBE_UNUSED
#endif
#if __cplusplus >= 201703L
# define YS_FALLTHROUGH [[fallthrough]];
#elif defined(__clang__)

20
passes/pmgen/pmgen.py
View file

@ -589,7 +589,7 @@ with open(outfile, "w") as f:
if block["type"] in ("match", "code"):
print(" // {}".format(block["src"]), file=f)
print(" void block_{}(int recursion YS_ATTRIBUTE(unused)) {{".format(index), file=f)
print(" void block_{}(int recursion YS_MAYBE_UNUSED) {{".format(index), file=f)
current_pattern, current_subpattern = block["pattern"]
if block["type"] == "final":
@ -636,17 +636,17 @@ with open(outfile, "w") as f:
for s in sorted(const_st):
t = state_types[current_pattern][s]
if t.endswith("*"):
print(" {} const &{} YS_ATTRIBUTE(unused) = st_{}.{};".format(t, s, current_pattern, s), file=f)
print(" {} const &{} YS_MAYBE_UNUSED = st_{}.{};".format(t, s, current_pattern, s), file=f)
else:
print(" const {} &{} YS_ATTRIBUTE(unused) = st_{}.{};".format(t, s, current_pattern, s), file=f)
print(" const {} &{} YS_MAYBE_UNUSED = st_{}.{};".format(t, s, current_pattern, s), file=f)
for s in sorted(nonconst_st):
t = state_types[current_pattern][s]
print(" {} &{} YS_ATTRIBUTE(unused) = st_{}.{};".format(t, s, current_pattern, s), file=f)
print(" {} &{} YS_MAYBE_UNUSED = st_{}.{};".format(t, s, current_pattern, s), file=f)
for u in sorted(udata_types[current_pattern].keys()):
t = udata_types[current_pattern][u]
print(" {} &{} YS_ATTRIBUTE(unused) = ud_{}.{};".format(t, u, current_pattern, u), file=f)
print(" {} &{} YS_MAYBE_UNUSED = ud_{}.{};".format(t, u, current_pattern, u), file=f)
if len(restore_st):
print("", file=f)
@ -676,7 +676,7 @@ with open(outfile, "w") as f:
print("", file=f)
print("rollback_label:", file=f)
print(" YS_ATTRIBUTE(unused);", file=f)
print(" YS_MAYBE_UNUSED;", file=f)
if len(block["fcode"]):
print("#define accept do { accept_cnt++; on_accept(); } while(0)", file=f)
@ -684,7 +684,7 @@ with open(outfile, "w") as f:
for line in block["fcode"]:
print(" " + line, file=f)
print("finish_label:", file=f)
print(" YS_ATTRIBUTE(unused);", file=f)
print(" YS_MAYBE_UNUSED;", file=f)
print("#undef accept", file=f)
print("#undef finish", file=f)
@ -733,13 +733,13 @@ with open(outfile, "w") as f:
valueidx = 1
for item in block["setup"]:
if item[0] == "slice":
print(" const int &{} YS_ATTRIBUTE(unused) = std::get<{}>(cells[_pmg_idx]);".format(item[1], valueidx), file=f)
print(" const int &{} YS_MAYBE_UNUSED = std::get<{}>(cells[_pmg_idx]);".format(item[1], valueidx), file=f)
valueidx += 1
if item[0] == "choice":
print(" const {} &{} YS_ATTRIBUTE(unused) = std::get<{}>(cells[_pmg_idx]);".format(item[1], item[2], valueidx), file=f)
print(" const {} &{} YS_MAYBE_UNUSED = std::get<{}>(cells[_pmg_idx]);".format(item[1], item[2], valueidx), file=f)
valueidx += 1
if item[0] == "define":
print(" const {} &{} YS_ATTRIBUTE(unused) = std::get<{}>(cells[_pmg_idx]);".format(item[1], item[2], valueidx), file=f)
print(" const {} &{} YS_MAYBE_UNUSED = std::get<{}>(cells[_pmg_idx]);".format(item[1], item[2], valueidx), file=f)
valueidx += 1
print(" if (blacklist_cells.count({})) continue;".format(block["cell"]), file=f)
for expr in block["filter"]: