From 1bffedd1c0a205fc4790e3269ac1d92cf234c57d Mon Sep 17 00:00:00 2001
From: Saurabh Singh <saurabh.s99100@gmail.com>
Date: Sat, 24 Feb 2024 14:40:33 -0500
Subject: [PATCH] Add support for historyfile in atomsim debug mode

- read historyfile when entering interactive mode
  (create if necessary), write to history file
  after each command.
- print cycles when exiting atomsim
---
 .gitignore          |  2 +-
 sim/atomsim.cpp     |  2 +-
 sim/interactive.cpp | 27 +++++++++++++++++++++------
 3 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/.gitignore b/.gitignore
index fd3b82ca..793aba91 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,6 @@ docs/_build/
 *.out
 *.vcd
 python/
-
+.atomsim_history
 simport
 userport
\ No newline at end of file
diff --git a/sim/atomsim.cpp b/sim/atomsim.cpp
index aa6a1e5a..0aa114ae 100755
--- a/sim/atomsim.cpp
+++ b/sim/atomsim.cpp
@@ -82,7 +82,7 @@ int Atomsim::run()
 
             // check ebreak
             if(simstate_.state_.ins_e == RV_INSTR_EBREAK) {
-                printf("EBreak hit at %s0x%08x%s\n", ansicode(FG_BLUE), simstate_.state_.pc_e, ansicode(FG_RESET));
+                printf("EBreak hit at %ld ticks, PC=%s0x%08x%s\n", simstate_.state_.tickcount_total, ansicode(FG_BLUE), simstate_.state_.pc_e, ansicode(FG_RESET));
 
                 if(sim_config_.dump_on_ebreak_flag)  // For SCAR
                     simstate_.dump_simstate(sim_config_.dump_file);
diff --git a/sim/interactive.cpp b/sim/interactive.cpp
index 41503588..03bb7e54 100755
--- a/sim/interactive.cpp
+++ b/sim/interactive.cpp
@@ -17,6 +17,7 @@
 #define DEFAULT_DUMPMEM_PATH "memdump.txt"
 #define DEFAULT_TRACEFILE_PATH "trace.vcd"
 #define ATOMSIM_PROMPT "atomsim> "
+#define ATOMSIM_HISTORY_FILE ".atomsim_history"
 
 
 void Atomsim::display_dbg_screen()
@@ -187,6 +188,18 @@ Rcode Atomsim::run_interactive_mode()
     static std::string prev_cmd;
     static std::vector<std::string> prev_args;
 
+    // create history file if it doen't exist
+    FILE *history_file = fopen(ATOMSIM_HISTORY_FILE, "a");
+    if (history_file != NULL) {
+        fclose(history_file);
+    } else {
+        std::cerr << "Error creating history file.\n";
+        return RC_EXIT;
+    }
+
+    // read history file
+    read_history(ATOMSIM_HISTORY_FILE);
+
     while(!backend_.done())
     {
         // get input
@@ -214,16 +227,18 @@ Rcode Atomsim::run_interactive_mode()
             cmd = prev_cmd;
             args = prev_args;
         }
-        
-        // prev <= current
-        prev_cmd = cmd;
-        prev_args = args;
 
-        // Add to history
-        if(input!=""){
+        // Add input to history if it's != previous input
+        if(cmd != prev_cmd){
             add_history(input.c_str());
+            // save to history file
+            write_history(ATOMSIM_HISTORY_FILE);
         }
 
+        // prev <= current
+        prev_cmd = cmd;
+        prev_args = args;
+
         // execute
         if (funcs.count(cmd)) // check if command exists
         {