techmap: Add _TECHMAP_CELLNAME_ special parameter.

This parameter will resolve to the name of the cell being mapped.  The
first user of this parameter will be synth_intel_alm's Quartus output,
which requires a unique (and preferably descriptive) name passed as
a cell parameter for the memory cells.

CHANGELOG

@@ -39,7 +39,7 @@ Yosys 0.9 .. Yosys 0.9-dev
     - Improvements in pmgen: slices, choices, define, generate
     - Added "xilinx_srl" for Xilinx shift register extraction
     - Removed "shregmap -tech xilinx" (superseded by "xilinx_srl")
-    - Added "_TECHMAP_WIREINIT_*_" attribute and "_TECHMAP_REMOVEINIT_*_" wire for "techmap" pass
+    - Added "_TECHMAP_WIREINIT_*_" parameter and "_TECHMAP_REMOVEINIT_*_" wire for "techmap" pass
     - Added "-match-init" option to "dff2dffs" pass
     - Added "techmap_autopurge" support to techmap
     - Added "add -mod <modname[s]>"
@@ -69,6 +69,7 @@ Yosys 0.9 .. Yosys 0.9-dev
     - Added $divfloor and $modfloor cells
     - Added $adffe, $dffsre, $sdff, $sdffe, $sdffce, $adlatch cells
     - Added "dfflegalize" pass
+    - Added "_TECHMAP_CELLNAME_" parameter for "techmap" pass
 
 Yosys 0.8 .. Yosys 0.9
 ----------------------

kernel/constids.inc

@@ -172,6 +172,7 @@ X(T)
 X(TABLE)
 X(techmap_autopurge)
 X(_TECHMAP_BITS_CONNMAP_)
+X(_TECHMAP_CELLNAME_)
 X(_TECHMAP_CELLTYPE_)
 X(techmap_celltype)
 X(_TECHMAP_FAIL_)

passes/techmap/techmap.cc

@@ -643,6 +643,8 @@ struct TechmapWorker
 
 				if (tpl->avail_parameters.count(ID::_TECHMAP_CELLTYPE_) != 0)
 					parameters.emplace(ID::_TECHMAP_CELLTYPE_, RTLIL::unescape_id(cell->type));
+				if (tpl->avail_parameters.count(ID::_TECHMAP_CELLNAME_) != 0)
+					parameters.emplace(ID::_TECHMAP_CELLNAME_, RTLIL::unescape_id(cell->name));
 
 				for (auto &conn : cell->connections()) {
 					if (tpl->avail_parameters.count(stringf("\\_TECHMAP_CONSTMSK_%s_", log_id(conn.first))) != 0) {
@@ -1111,6 +1113,10 @@ struct TechmapPass : public Pass {
 		log("        When a parameter with this name exists, it will be set to the type name\n");
 		log("        of the cell that matches the module.\n");
 		log("\n");
+		log("    _TECHMAP_CELLNAME_\n");
+		log("        When a parameter with this name exists, it will be set to the name\n");
+		log("        of the cell that matches the module.\n");
+		log("\n");
 		log("    _TECHMAP_CONSTMSK_<port-name>_\n");
 		log("    _TECHMAP_CONSTVAL_<port-name>_\n");
 		log("        When this pair of parameters is available in a module for a port, then\n");

tests/techmap/cellname.ys

@@ -0,0 +1,41 @@
+read_verilog << EOT
+
+module sub (input i, output o);
+parameter _TECHMAP_CELLNAME_ = "";
+namedsub #(.name(_TECHMAP_CELLNAME_)) _TECHMAP_REPLACE_ (i, o);
+endmodule
+
+EOT
+
+design -stash map
+
+read_verilog << EOT
+
+(* blackbox *)
+module sub (input i, output o);
+endmodule
+
+(* blackbox *)
+module namedsub (input i, output o);
+parameter name = "";
+endmodule
+
+module top(input [3:0] i, output [3:0] o);
+
+sub s1 (i[0], o[0]);
+sub subsubsub (i[1], o[1]);
+sub s2 (i[2], o[2]);
+sub xxx (i[3], o[3]);
+
+endmodule
+
+EOT
+
+techmap -map %map
+
+select -assert-count 4 t:namedsub
+select -assert-count 0 t:sub
+select -assert-count 1 t:namedsub r:name=s1 %i
+select -assert-count 1 t:namedsub r:name=subsubsub %i
+select -assert-count 1 t:namedsub r:name=s2 %i
+select -assert-count 1 t:namedsub r:name=xxx %i