Add plus-assignment operator

Signed-off-by: Kamil Rakoczy <krakoczy@antmicro.com>

diff --git a/frontends/verilog/verilog_lexer.l b/frontends/verilog/verilog_lexer.l
index ea85bf52e123ebb18e2c00930a79468cffdf5639..c77da4274362271458dd0688b429a10530320a7d 100644 (file)
--- a/frontends/verilog/verilog_lexer.l
+++ b/frontends/verilog/verilog_lexer.l
@@ -527,6 +527,7 @@ import[ \t\r\n]+\"(DPI|DPI-C)\"[ \t\r\n]+function[ \t\r\n]+ {
 ".*" { return TOK_WILDCARD_CONNECT; }
 
 "|=" { SV_KEYWORD(TOK_OR_ASSIGN); }
+"+=" { SV_KEYWORD(TOK_PLUS_ASSIGN); }
 
 [-+]?[=*]> {
        if (!specify_mode) REJECT;

diff --git a/frontends/verilog/verilog_parser.y b/frontends/verilog/verilog_parser.y
index f7a73b00e0d06842fe844bb2972f79379bd98a97..e8b74cf83cb2f76806268457ef88591530a83485 100644 (file)
--- a/frontends/verilog/verilog_parser.y
+++ b/frontends/verilog/verilog_parser.y
@@ -256,7 +256,7 @@ static void rewriteAsMemoryNode(AstNode *node, AstNode *rangeNode)
 %token TOK_PACKAGE TOK_ENDPACKAGE TOK_PACKAGESEP
 %token TOK_INTERFACE TOK_ENDINTERFACE TOK_MODPORT TOK_VAR TOK_WILDCARD_CONNECT
 %token TOK_INPUT TOK_OUTPUT TOK_INOUT TOK_WIRE TOK_WAND TOK_WOR TOK_REG TOK_LOGIC
-%token TOK_INTEGER TOK_SIGNED TOK_ASSIGN TOK_ALWAYS TOK_INITIAL
+%token TOK_INTEGER TOK_SIGNED TOK_ASSIGN TOK_PLUS_ASSIGN TOK_ALWAYS TOK_INITIAL
 %token TOK_ALWAYS_FF TOK_ALWAYS_COMB TOK_ALWAYS_LATCH
 %token TOK_BEGIN TOK_END TOK_IF TOK_ELSE TOK_FOR TOK_WHILE TOK_REPEAT
 %token TOK_DPI_FUNCTION TOK_POSEDGE TOK_NEGEDGE TOK_OR TOK_OR_ASSIGN TOK_AUTOMATIC
@@ -2342,6 +2342,14 @@ simple_behavioral_stmt:
                SET_AST_NODE_LOC(node, @2, @5);
                ast_stack.back()->children.push_back(node);
                append_attr(node, $1);
+       } |
+       attr lvalue TOK_PLUS_ASSIGN delay expr {
+               AstNode *add_node = new AstNode(AST_ADD, $2->clone(), $5);
+               AstNode *node = new AstNode(AST_ASSIGN_EQ, $2, add_node);
+               SET_AST_NODE_LOC(node, @2, @5);
+               SET_AST_NODE_LOC(add_node, @2, @5);
+               ast_stack.back()->children.push_back(node);
+               append_attr(node, $1);
        };
 
 // this production creates the obligatory if-else shift/reduce conflict