diff --git a/.gitignore b/.gitignore
index cd624f233..4fce690ec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,8 @@
 *.d
 .*.swp
 *.gch
+*.gcda
+*.gcno
 /.cproject
 /.project
 /.settings
@@ -10,6 +12,8 @@
 /qtcreator.config
 /qtcreator.creator
 /qtcreator.creator.user
+/coverage.info
+/coverage_html
 /Makefile.conf
 /abc
 /viz.js
diff --git a/Makefile b/Makefile
index c1e5c789d..39a361a5f 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,7 @@ ENABLE_LIBYOSYS := 0
 ENABLE_PROTOBUF := 0
 
 # other configuration flags
+ENABLE_GCOV := 0
 ENABLE_GPROF := 0
 ENABLE_DEBUG := 0
 ENABLE_NDEBUG := 0
@@ -158,7 +159,7 @@ ABCMKARGS += ARCHFLAGS="-DABC_USE_STDINT_H"
 
 else ifeq ($(CONFIG),gcc-static)
 LD = $(CXX)
-LDFLAGS := $(filter-out -rdynamic,$(LDFLAGS)) -s
+LDFLAGS := $(filter-out -rdynamic,$(LDFLAGS)) -static
 LDLIBS := $(filter-out -lrt,$(LDLIBS)) 
 CXXFLAGS := $(filter-out -fPIC,$(CXXFLAGS))
 CXXFLAGS += -std=c++11 -Os
@@ -312,6 +313,11 @@ endif
 endif
 endif
 
+ifeq ($(ENABLE_GCOV),1)
+CXXFLAGS += --coverage
+LDFLAGS += --coverage
+endif
+
 ifeq ($(ENABLE_GPROF),1)
 CXXFLAGS += -pg
 LDFLAGS += -pg
@@ -644,6 +650,12 @@ clean-abc:
 mrproper: clean
 	git clean -xdf
 
+coverage:
+	./yosys -qp 'help; help -all'
+	rm -rf coverage.info coverage_html
+	lcov --capture -d . --no-external -o coverage.info
+	genhtml coverage.info --output-directory coverage_html
+
 qtcreator:
 	{ for file in $(basename $(OBJS)); do \
 		for prefix in cc y l; do if [ -f $${file}.$${prefix} ]; then echo $$file.$${prefix}; fi; done \
@@ -709,6 +721,11 @@ config-msys2: clean
 config-msys2-64: clean
 	echo 'CONFIG := msys2-64' > Makefile.conf
 
+config-gcov: clean
+	echo 'CONFIG := gcc' > Makefile.conf
+	echo 'ENABLE_GCOV := 1' >> Makefile.conf
+	echo 'ENABLE_DEBUG := 1' >> Makefile.conf
+
 config-gprof: clean
 	echo 'CONFIG := gcc' > Makefile.conf
 	echo 'ENABLE_GPROF := 1' >> Makefile.conf
@@ -729,6 +746,6 @@ echo-git-rev:
 -include kernel/*.d
 -include techlibs/*/*.d
 
-.PHONY: all top-all abc test install install-abc manual clean mrproper qtcreator
+.PHONY: all top-all abc test install install-abc manual clean mrproper qtcreator coverage vcxsrc mxebin
 .PHONY: config-clean config-clang config-gcc config-gcc-static config-gcc-4.8 config-gprof config-sudo
 
diff --git a/frontends/ast/ast.cc b/frontends/ast/ast.cc
index 7c72a50d9..e79be953a 100644
--- a/frontends/ast/ast.cc
+++ b/frontends/ast/ast.cc
@@ -44,7 +44,7 @@ namespace AST {
 
 // instanciate global variables (private API)
 namespace AST_INTERNAL {
-	bool flag_dump_ast1, flag_dump_ast2, flag_dump_vlog, flag_dump_rtlil, flag_nolatches, flag_nomeminit;
+	bool flag_dump_ast1, flag_dump_ast2, flag_no_dump_ptr, flag_dump_vlog, flag_dump_rtlil, flag_nolatches, flag_nomeminit;
 	bool flag_nomem2reg, flag_mem2reg, flag_lib, flag_noopt, flag_icells, flag_autowire;
 	AstNode *current_ast, *current_ast_mod;
 	std::map<std::string, AstNode*> current_scope;
@@ -267,10 +267,12 @@ void AstNode::dumpAst(FILE *f, std::string indent) const
 	std::string type_name = type2str(type);
 	fprintf(f, "%s%s <%s:%d>", indent.c_str(), type_name.c_str(), filename.c_str(), linenum);
 
-	if (id2ast)
-		fprintf(f, " [%p -> %p]", this, id2ast);
-	else
-		fprintf(f, " [%p]", this);
+	if (!flag_no_dump_ptr) {
+		if (id2ast)
+			fprintf(f, " [%p -> %p]", this, id2ast);
+		else
+			fprintf(f, " [%p]", this);
+	}
 
 	if (!str.empty())
 		fprintf(f, " str='%s'", str.c_str());
@@ -1008,12 +1010,13 @@ static AstModule* process_module(AstNode *ast, bool defer)
 }
 
 // create AstModule instances for all modules in the AST tree and add them to 'design'
-void AST::process(RTLIL::Design *design, AstNode *ast, bool dump_ast1, bool dump_ast2, bool dump_vlog, bool dump_rtlil,
+void AST::process(RTLIL::Design *design, AstNode *ast, bool dump_ast1, bool dump_ast2, bool no_dump_ptr, bool dump_vlog, bool dump_rtlil,
 		bool nolatches, bool nomeminit, bool nomem2reg, bool mem2reg, bool lib, bool noopt, bool icells, bool nooverwrite, bool overwrite, bool defer, bool autowire)
 {
 	current_ast = ast;
 	flag_dump_ast1 = dump_ast1;
 	flag_dump_ast2 = dump_ast2;
+	flag_no_dump_ptr = no_dump_ptr;
 	flag_dump_vlog = dump_vlog;
 	flag_dump_rtlil = dump_rtlil;
 	flag_nolatches = nolatches;
diff --git a/frontends/ast/ast.h b/frontends/ast/ast.h
index d94199643..7e97bdb3b 100644
--- a/frontends/ast/ast.h
+++ b/frontends/ast/ast.h
@@ -274,7 +274,7 @@ namespace AST
 	};
 
 	// process an AST tree (ast must point to an AST_DESIGN node) and generate RTLIL code
-	void process(RTLIL::Design *design, AstNode *ast, bool dump_ast1, bool dump_ast2, bool dump_vlog, bool dump_rtlil, bool nolatches, bool nomeminit,
+	void process(RTLIL::Design *design, AstNode *ast, bool dump_ast1, bool dump_ast2, bool no_dump_ptr, bool dump_vlog, bool dump_rtlil, bool nolatches, bool nomeminit,
 			bool nomem2reg, bool mem2reg, bool lib, bool noopt, bool icells, bool nooverwrite, bool overwrite, bool defer, bool autowire);
 
 	// parametric modules are supported directly by the AST library
@@ -305,7 +305,7 @@ namespace AST
 namespace AST_INTERNAL
 {
 	// internal state variables
-	extern bool flag_dump_ast1, flag_dump_ast2, flag_dump_rtlil, flag_nolatches, flag_nomeminit;
+	extern bool flag_dump_ast1, flag_dump_ast2, flag_no_dump_ptr, flag_dump_rtlil, flag_nolatches, flag_nomeminit;
 	extern bool flag_nomem2reg, flag_mem2reg, flag_lib, flag_noopt, flag_icells, flag_autowire;
 	extern AST::AstNode *current_ast, *current_ast_mod;
 	extern std::map<std::string, AST::AstNode*> current_scope;
diff --git a/frontends/ilang/.gitignore b/frontends/ilang/.gitignore
index 43106a814..f586b33c7 100644
--- a/frontends/ilang/.gitignore
+++ b/frontends/ilang/.gitignore
@@ -1,4 +1,4 @@
 ilang_lexer.cc
 ilang_parser.output
 ilang_parser.tab.cc
-ilang_parser.tab.h
+ilang_parser.tab.hh
diff --git a/frontends/ilang/Makefile.inc b/frontends/ilang/Makefile.inc
index e2a476c93..6f1f0e8fc 100644
--- a/frontends/ilang/Makefile.inc
+++ b/frontends/ilang/Makefile.inc
@@ -1,15 +1,14 @@
 
 GENFILES += frontends/ilang/ilang_parser.tab.cc
-GENFILES += frontends/ilang/ilang_parser.tab.h
+GENFILES += frontends/ilang/ilang_parser.tab.hh
 GENFILES += frontends/ilang/ilang_parser.output
 GENFILES += frontends/ilang/ilang_lexer.cc
 
 frontends/ilang/ilang_parser.tab.cc: frontends/ilang/ilang_parser.y
 	$(Q) mkdir -p $(dir $@)
-	$(P) $(BISON) -d -r all -b frontends/ilang/ilang_parser $<
-	$(Q) mv frontends/ilang/ilang_parser.tab.c frontends/ilang/ilang_parser.tab.cc
+	$(P) $(BISON) -o $@ -d -r all -b frontends/ilang/ilang_parser $<
 
-frontends/ilang/ilang_parser.tab.h: frontends/ilang/ilang_parser.tab.cc
+frontends/ilang/ilang_parser.tab.hh: frontends/ilang/ilang_parser.tab.cc
 
 frontends/ilang/ilang_lexer.cc: frontends/ilang/ilang_lexer.l
 	$(Q) mkdir -p $(dir $@)
diff --git a/frontends/ilang/ilang_lexer.l b/frontends/ilang/ilang_lexer.l
index 842388548..d8e01ae4d 100644
--- a/frontends/ilang/ilang_lexer.l
+++ b/frontends/ilang/ilang_lexer.l
@@ -30,7 +30,7 @@
 #endif
 
 #include "frontends/ilang/ilang_frontend.h"
-#include "ilang_parser.tab.h"
+#include "ilang_parser.tab.hh"
 
 USING_YOSYS_NAMESPACE
 
diff --git a/frontends/verilog/.gitignore b/frontends/verilog/.gitignore
index 1d4ae9e5c..aadbcdcdd 100644
--- a/frontends/verilog/.gitignore
+++ b/frontends/verilog/.gitignore
@@ -1,4 +1,4 @@
 verilog_lexer.cc
 verilog_parser.output
 verilog_parser.tab.cc
-verilog_parser.tab.h
+verilog_parser.tab.hh
diff --git a/frontends/verilog/Makefile.inc b/frontends/verilog/Makefile.inc
index a06c1d5ab..dbaace585 100644
--- a/frontends/verilog/Makefile.inc
+++ b/frontends/verilog/Makefile.inc
@@ -1,15 +1,14 @@
 
 GENFILES += frontends/verilog/verilog_parser.tab.cc
-GENFILES += frontends/verilog/verilog_parser.tab.h
+GENFILES += frontends/verilog/verilog_parser.tab.hh
 GENFILES += frontends/verilog/verilog_parser.output
 GENFILES += frontends/verilog/verilog_lexer.cc
 
 frontends/verilog/verilog_parser.tab.cc: frontends/verilog/verilog_parser.y
 	$(Q) mkdir -p $(dir $@)
-	$(P) $(BISON) -d -r all -b frontends/verilog/verilog_parser $<
-	$(Q) mv frontends/verilog/verilog_parser.tab.c frontends/verilog/verilog_parser.tab.cc
+	$(P) $(BISON) -o $@ -d -r all -b frontends/verilog/verilog_parser $<
 
-frontends/verilog/verilog_parser.tab.h: frontends/verilog/verilog_parser.tab.cc
+frontends/verilog/verilog_parser.tab.hh: frontends/verilog/verilog_parser.tab.cc
 
 frontends/verilog/verilog_lexer.cc: frontends/verilog/verilog_lexer.l
 	$(Q) mkdir -p $(dir $@)
diff --git a/frontends/verilog/verilog_frontend.cc b/frontends/verilog/verilog_frontend.cc
index 911e36112..8dcc7c5aa 100644
--- a/frontends/verilog/verilog_frontend.cc
+++ b/frontends/verilog/verilog_frontend.cc
@@ -78,6 +78,9 @@ struct VerilogFrontend : public Frontend {
 		log("    -dump_ast2\n");
 		log("        dump abstract syntax tree (after simplification)\n");
 		log("\n");
+		log("    -no_dump_ptr\n");
+		log("        do not include hex memory addresses in dump (easier to diff dumps)\n");
+		log("\n");
 		log("    -dump_vlog\n");
 		log("        dump ast as Verilog code (after simplification)\n");
 		log("\n");
@@ -184,6 +187,7 @@ struct VerilogFrontend : public Frontend {
 	{
 		bool flag_dump_ast1 = false;
 		bool flag_dump_ast2 = false;
+		bool flag_no_dump_ptr = false;
 		bool flag_dump_vlog = false;
 		bool flag_dump_rtlil = false;
 		bool flag_nolatches = false;
@@ -241,6 +245,10 @@ struct VerilogFrontend : public Frontend {
 				flag_dump_ast2 = true;
 				continue;
 			}
+			if (arg == "-no_dump_ptr") {
+				flag_no_dump_ptr = true;
+				continue;
+			}
 			if (arg == "-dump_vlog") {
 				flag_dump_vlog = true;
 				continue;
@@ -381,7 +389,7 @@ struct VerilogFrontend : public Frontend {
 		if (flag_nodpi)
 			error_on_dpi_function(current_ast);
 
-		AST::process(design, current_ast, flag_dump_ast1, flag_dump_ast2, flag_dump_vlog, flag_dump_rtlil, flag_nolatches, flag_nomeminit, flag_nomem2reg, flag_mem2reg, lib_mode, flag_noopt, flag_icells, flag_nooverwrite, flag_overwrite, flag_defer, default_nettype_wire);
+		AST::process(design, current_ast, flag_dump_ast1, flag_dump_ast2, flag_no_dump_ptr, flag_dump_vlog, flag_dump_rtlil, flag_nolatches, flag_nomeminit, flag_nomem2reg, flag_mem2reg, lib_mode, flag_noopt, flag_icells, flag_nooverwrite, flag_overwrite, flag_defer, default_nettype_wire);
 
 		if (!flag_nopp)
 			delete lexin;
diff --git a/frontends/verilog/verilog_lexer.l b/frontends/verilog/verilog_lexer.l
index 0134416c1..83921bf0b 100644
--- a/frontends/verilog/verilog_lexer.l
+++ b/frontends/verilog/verilog_lexer.l
@@ -42,7 +42,7 @@
 #include "kernel/log.h"
 #include "frontends/verilog/verilog_frontend.h"
 #include "frontends/ast/ast.h"
-#include "verilog_parser.tab.h"
+#include "verilog_parser.tab.hh"
 
 USING_YOSYS_NAMESPACE
 using namespace AST;
diff --git a/frontends/verilog/verilog_parser.y b/frontends/verilog/verilog_parser.y
index 78cac5543..2389d7d31 100644
--- a/frontends/verilog/verilog_parser.y
+++ b/frontends/verilog/verilog_parser.y
@@ -654,7 +654,7 @@ specify_item:
 	// | pulsestyle_declaration
 	// | showcancelled_declaration
 	| path_declaration
-	// | system_timing_declaration
+	| system_timing_declaration
 	;
 
 specparam_declaration:
@@ -682,22 +682,23 @@ showcancelled_declaration :
 */
 
 path_declaration :
-	simple_path_declaration
+	simple_path_declaration ';'
 	// | edge_sensitive_path_declaration
 	// | state_dependent_path_declaration
 	;
 
 simple_path_declaration :
-	parallel_path_description '=' path_delay_value ';'
-	// | full_path_description '=' path_delay_value ';'
+	parallel_path_description '=' path_delay_value |
+	full_path_description '=' path_delay_value
 	;
 
 path_delay_value :
-	//list_of_path_delay_expressions
-	'(' list_of_path_delay_expressions ')'
+	'(' path_delay_expression list_of_path_delay_extra_expressions ')'
+	|     path_delay_expression
+	|     path_delay_expression list_of_path_delay_extra_expressions
 	;
 
-list_of_path_delay_expressions :
+list_of_path_delay_extra_expressions :
 /*
 	t_path_delay_expression
 	| trise_path_delay_expression ',' tfall_path_delay_expression
@@ -709,12 +710,11 @@ list_of_path_delay_expressions :
 	  t0x_path_delay_expression ',' tx1_path_delay_expression ',' t1x_path_delay_expression ','
 	  tx0_path_delay_expression ',' txz_path_delay_expression ',' tzx_path_delay_expression
 */
-	path_delay_expression
-	| path_delay_expression ',' path_delay_expression
-	| path_delay_expression ',' path_delay_expression ',' path_delay_expression
-	| path_delay_expression ',' path_delay_expression ',' path_delay_expression ','
+	',' path_delay_expression
+	|  ',' path_delay_expression ',' path_delay_expression
+	|  ',' path_delay_expression ',' path_delay_expression ','
 	  path_delay_expression ',' path_delay_expression ',' path_delay_expression
-	| path_delay_expression ',' path_delay_expression ',' path_delay_expression ','
+	|  ',' path_delay_expression ',' path_delay_expression ','
 	  path_delay_expression ',' path_delay_expression ',' path_delay_expression ','
 	  path_delay_expression ',' path_delay_expression ',' path_delay_expression ','
 	  path_delay_expression ',' path_delay_expression ',' path_delay_expression
@@ -723,6 +723,22 @@ list_of_path_delay_expressions :
 parallel_path_description :
 	'(' specify_input_terminal_descriptor opt_polarity_operator '=' '>' specify_output_terminal_descriptor ')' ;
 
+full_path_description :
+	'(' list_of_path_inputs '*' '>' list_of_path_outputs ')' ;
+
+// This was broken into 2 rules to solve shift/reduce conflicts
+list_of_path_inputs :
+	specify_input_terminal_descriptor                  opt_polarity_operator  |
+	specify_input_terminal_descriptor more_path_inputs opt_polarity_operator ;
+
+more_path_inputs :
+    ',' specify_input_terminal_descriptor |
+    more_path_inputs ',' specify_input_terminal_descriptor ;
+
+list_of_path_outputs :
+	specify_output_terminal_descriptor |
+	list_of_path_outputs ',' specify_output_terminal_descriptor ;
+	
 opt_polarity_operator :
 	'+'
 	| '-'
@@ -736,11 +752,18 @@ specify_input_terminal_descriptor :
 specify_output_terminal_descriptor :
 	TOK_ID ;
 
-/*
 system_timing_declaration :
-	;
-*/
+	TOK_ID '(' system_timing_args ')' ';' ;
 
+system_timing_arg :
+	TOK_POSEDGE TOK_ID |
+	TOK_NEGEDGE TOK_ID |
+	expr ;
+
+system_timing_args :
+	system_timing_arg |
+	system_timing_args ',' system_timing_arg ;
+ 
 /*
 t_path_delay_expression :
 	path_delay_expression;
@@ -792,7 +815,7 @@ tzx_path_delay_expression :
 */
 
 path_delay_expression :
-	constant_mintypmax_expression;
+	constant_expression;
 
 constant_mintypmax_expression :
 	constant_expression