From 7f2cf709c55467f4b63b334ac2e05214ce8f8853 Mon Sep 17 00:00:00 2001
From: Yuxiao Mao <yuxiao.mao@outlook.com>
Date: Mon, 25 Nov 2024 11:39:47 +0100
Subject: [PATCH] Add @d @f commands for advanced debugging with addr

---
 hld/Value.hx     | 21 +++++++++++++++++++++
 src/HLAdapter.hx | 27 +++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/hld/Value.hx b/hld/Value.hx
index 205dc51..5954053 100644
--- a/hld/Value.hx
+++ b/hld/Value.hx
@@ -104,6 +104,27 @@ enum Hint {
 		return prefix + s;
 	}
 
+	public static function parseInt64( str : String ) : haxe.Int64 {
+		var value = haxe.Int64.make(0, 0);
+		var base = 16;
+		var shift = 4;
+		var i = 0;
+		if( StringTools.startsWith(str,"0x") ) {
+			i += 2;
+		}
+		while( i < str.length ) {
+			var c = str.charCodeAt(i);
+			var cval = if( c >= '0'.code && c <= '9'.code ) c - '0'.code
+				else if( c >= 'A'.code && c <= 'F'.code ) c - 'A'.code + 10
+				else if( c >= 'a'.code && c <= 'f'.code ) c - 'a'.code + 10
+				else
+					break;
+			value = (value << shift) + cval;
+			i++;
+		}
+		return value;
+	}
+
 	public static function intEnumFlags( value : Int, eproto : format.hl.Data.EnumPrototype ) : String {
 		var f = "";
 		for( i in 0...eproto.constructs.length ) {
diff --git a/src/HLAdapter.hx b/src/HLAdapter.hx
index e749a77..9742783 100644
--- a/src/HLAdapter.hx
+++ b/src/HLAdapter.hx
@@ -1021,6 +1021,33 @@ class HLAdapter extends DebugSession {
 				args.expression = args.expression.substr(1);
 			if( KEYWORDS.exists(args.expression) ) {
 				// Do nothing
+			} else if( args.expression.charCodeAt(0) == '@'.code ) {
+				// Advanced commands based on address
+				switch( args.expression.charCodeAt(1) ) {
+				case 'd'.code:
+					// @d + ptr: try to evaluate pointer as Dynamic value
+					var p = new hld.Pointer(hld.Value.parseInt64(args.expression.substr(2)));
+					var value = @:privateAccess dbg.eval.convertVal(p, HDyn);
+					value.hint = HPointer;
+					var v = makeVar("", value);
+					response.body = {
+						result : v.value,
+						type : v.type,
+						variablesReference : v.variablesReference,
+						namedVariables : v.namedVariables,
+						indexedVariables : v.indexedVariables,
+					};
+				case 'f'.code:
+					// @f + ptr: try to evaluate pointer as FunRepr
+					var p = new hld.Pointer(hld.Value.parseInt64(args.expression.substr(2)));
+					@:privateAccess var index = dbg.jit.functionFromAddr(p);
+					response.body = {
+						result : dbg.eval.funStr(index == null ? FUnknown(p) : FIndex(index, p), true),
+						variablesReference : 0,
+					};
+				default:
+					debug("Unsupported command");
+				}
 			} else {
 				var value = dbg.getValue(args.expression);
 				var v = makeVar("", value);