> compile NEMU

ysyx_22040000 李心杨
Linux calcite 6.1.69 #1-NixOS SMP PREEMPT_DYNAMIC Wed Dec 20 16:00:29 UTC 2023 x86_64 GNU/Linux
 15:19:17  up  15:35,  2 users,  load average: 0.35, 0.60, 0.60

nemu/scripts/build.mk

@@ -40,6 +40,16 @@ $(OBJ_DIR)/%.o: %.cc
 	@$(CXX) $(CFLAGS) $(CXXFLAGS) -c -o $@ $<
 	$(call call_fixdep, $(@:.o=.d), $@)
 
+$(OBJ_DIR)/%-lex.l: %-exp.y
+	@echo + YACC $<
+	@mkdir -p $(dir $@)
+	@$(YACC) $(YFLAGS) -H $(<:.y=.h) -o $@ $<
+
+$(OBJ_DIR)/%.c: %-lex.l
+	@echo + LEX $<
+	@mkdir -p $(dir $@)
+	@$(LEX) $(LFLAGS) -o $@ $<
+
 # Depencies
 -include $(OBJS:.o=.d)
 

nemu/src/monitor/sdb/expr.c

@@ -21,24 +21,18 @@
 #include <regex.h>
 
 enum {
-  TK_NOTYPE = 256, TK_EQ,
-
-  /* TODO: Add more token types */
-
+  TK_NOTYPE = 256, TK_EQ, TK_NUMBER,
+  LEX_GROUP_OPERATOR, LEX_GROUP_DIGIT
 };
 
 static struct rule {
   const char *regex;
   int token_type;
 } rules[] = {
-
-  /* TODO: Add more rules.
-   * Pay attention to the precedence level of different rules.
-   */
-
-  {" +", TK_NOTYPE},    // spaces
-  {"\\+", '+'},         // plus
-  {"==", TK_EQ},        // equal
+  {"[ \t]+", TK_NOTYPE},
+  {"==", TK_EQ},
+  {"[0-9]+", LEX_GROUP_DIGIT},
+  {"[\\+-*/()", LEX_GROUP_OPERATOR},
 };
 
 #define NR_REGEX ARRLEN(rules)
@@ -95,6 +89,16 @@ static bool make_token(char *e) {
          */
 
         switch (rules[i].token_type) {
+          case LEX_GROUP_OPERATOR:
+            tokens[nr_token].type = *substr_start;
+            tokens[nr_token].str[0] = '\0';
+            nr_token++;
+            break;
+          case LEX_GROUP_DIGIT:
+            tokens[nr_token].type = TK_NUMBER;
+            nr_token++;
+            break;
+          case TK_NOTYPE: break;
           default: TODO();
         }