Loop info

Makefile

@@ -19,6 +19,7 @@ ENABLE_GHDL := 0
 ENABLE_SLANG := 0
 ENABLE_VERIFIC := 1
 ENABLE_VERIFIC_SYSTEMVERILOG := 1
+VERIFIC_LINEFILE_INCLUDES_LOOPS := 1
 ENABLE_VERIFIC_VHDL := 0
 ENABLE_VERIFIC_HIER_TREE := 1
 ENABLE_VERIFIC_SILIMATE_EXTENSIONS := 1
@@ -515,6 +516,9 @@ ifneq ($(wildcard $(VERIFIC_DIR)/hier_tree),)
 VERIFIC_COMPONENTS += hier_tree
 endif
 endif
+ifeq ($(VERIFIC_LINEFILE_INCLUDES_LOOPS),1)
+CXXFLAGS += -DVERIFIC_LINEFILE_INCLUDES_LOOPS
+endif
 ifeq ($(ENABLE_VERIFIC_SYSTEMVERILOG),1)
 VERIFIC_COMPONENTS += verilog
 CXXFLAGS += -DVERIFIC_SYSTEMVERILOG_SUPPORT

frontends/verific/decorate_loops.h

@@ -0,0 +1,76 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2012  Claire Xenia Wolf <[email protected]>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+#ifdef VERIFIC_LINEFILE_INCLUDES_LOOPS
+/*
+    This Visitor decorates the AST with a loop ID attribute for all outer for loops.
+    All AST nodes contained within the subtree of an outer for-loop
+    have the same ID carried as an additional payload of the "linefile" struct.
+    The ID is unique accross the flat RTL module set, as it is computed before elaboration.
+    It is not unique per instance of the modules.
+    A further separation of cells belonging to a given loop instance is necessary by means of
+    connectivity analysis.
+    No "loop instance" information seems to exist to cluster those loops elements together unfortunately.
+*/
+class DecorateLoopsVisitor : public VeriVisitor
+{
+      public:
+	DecorateLoopsVisitor() : VeriVisitor() {};
+	~DecorateLoopsVisitor() {};
+	virtual void VERI_VISIT(VeriLoop, node)
+	{
+		// std::cout << "Loop in: " << (VeriLoop *)&node << " id: " << outerLoopId << std::endl;
+		if (loopStack.empty()) {
+			// We increase the loop count when we enter a new set of imbricated loops,
+			// That way we have a loop index for the outermost loop as we want to identify and group
+			// logic generated by imbricated loops
+			outerLoopId++;
+		}
+		loopStack.push((VeriLoop *)&node);
+	}
+
+	void PreAction(VeriTreeNode & /*node*/)
+	{
+		// VeriNode *vnode = dynamic_cast<VeriNode *>(&node);
+		// std::cout << "Node pre: " << vnode << std::endl;
+	}
+
+	virtual void PostAction(VeriTreeNode &node)
+	{
+		// std::cout << "Node post: " << (VeriTreeNode *)&node << std::endl;
+		if (loopStack.size()) {
+			if (loopStack.top() == (VeriLoop *)&node) {
+				loopStack.pop();
+				std::cout << "Loop out: " << (VeriFor *)&node << std::endl;
+				return;
+			}
+			Verific::linefile_type linefile = (Verific::linefile_type)node.Linefile();
+			// Unfortunately there is no good way to systematically copy certain AST attributes to the Netlist attributes like:
+			// VeriNode *vnode = dynamic_cast<VeriNode *>(&node);
+			// vnode->AddAttribute(" in_loop", new VeriIntVal(outerLoopId));
+			// Instead using linefile struct to pass that information:
+			if (linefile)
+				linefile->SetInLoop(outerLoopId);
+		}
+	}
+
+      private:
+	std::stack<VeriLoop *> loopStack;
+	uint32_t outerLoopId = 0;
+};
+#endif

frontends/verific/verific.cc

@@ -54,6 +54,9 @@ USING_YOSYS_NAMESPACE
 #include "VeriWrite.h"
 #include "VeriLibrary.h"
 #include "VeriExpression.h"
+#ifdef VERIFIC_LINEFILE_INCLUDES_LOOPS
+#include "VeriConstVal.h"
+#endif
 #endif
 
 #ifdef VERIFIC_VHDL_SUPPORT
@@ -104,6 +107,10 @@ using namespace Verific;
 
 #endif
 
+#ifdef VERIFIC_LINEFILE_INCLUDES_LOOPS
+#include "decorate_loops.h"
+#endif
+
 #ifdef YOSYS_ENABLE_VERIFIC
 YOSYS_NAMESPACE_BEGIN
 
@@ -420,8 +427,14 @@ void VerificImporter::import_attributes(dict<RTLIL::IdString, RTLIL::Const> &att
 	Att *attr;
 
 #ifdef VERIFIC_LINEFILE_INCLUDES_COLUMNS 
-	if (obj->Linefile())
+	if (obj->Linefile()) {
 		attributes[ID::src] = stringf("%s:%d.%d-%d.%d", LineFile::GetFileName(obj->Linefile()), obj->Linefile()->GetLeftLine(), obj->Linefile()->GetLeftCol(), obj->Linefile()->GetRightLine(), obj->Linefile()->GetRightCol());
+#ifdef VERIFIC_LINEFILE_INCLUDES_LOOPS
+		if (uint32_t loopid = obj->Linefile()->GetInLoop()) {
+			attributes[RTLIL::escape_id("in_loop_" + std::to_string(loopid))] = std::to_string(loopid);
+		}
+#endif
+	}
 #else
 	if (obj->Linefile())
 		attributes[ID::src] = stringf("%s:%d", LineFile::GetFileName(obj->Linefile()), LineFile::GetLineNo(obj->Linefile()));
@@ -2901,6 +2914,7 @@ std::set<std::string> import_tops(const char* work, std::map<std::string,Netlist
 			}
 		}
 #endif
+
 #ifdef VERIFIC_HIER_TREE_SUPPORT
 		if (show_message)
 			log("Running hier_tree::Elaborate().\n");
@@ -2996,6 +3010,17 @@ std::string verific_import(Design *design, const std::map<std::string,std::strin
 	for (const auto &i : parameters)
 		verific_params.Insert(i.first.c_str(), i.second.c_str());
 
+#ifdef VERIFIC_LINEFILE_INCLUDES_LOOPS
+		VeriLibrary* veri_lib = veri_file::GetLibrary("work", 1);
+		// Decorate AST with loop scope id
+		VeriModule *module;
+		MapIter mi;
+		DecorateLoopsVisitor loop_visitor;
+		FOREACH_VERILOG_MODULE_IN_LIBRARY(veri_lib, mi, module) { 
+			module->Accept(loop_visitor); 
+		}
+#endif
+
 	std::set<std::string> top_mod_names;
 	if (top.empty()) {
 		import_all("work", &nl_todo, &verific_params, false, "");