Print string contents for "this" references

The changes reflect the feature request eclipse-openj9#20878.

Print string contents for this references.
Also, print address for string arguments and returns.

Closes: eclipse-openj9#20878
Signed-off-by: Nick Kamal <[email protected]>

Author: h3110n3rv3

runtime/rastrace/method_trace.c

@@ -200,12 +200,49 @@ traceMethodEnter(J9VMThread *thr, J9Method *method, void *receiverAddress, UDATA
 			if (modifiers & J9AccNative) {
 				Trc_MethodEntryN(thr, J9UTF8_LENGTH(className), J9UTF8_DATA(className), J9UTF8_LENGTH(methodName), J9UTF8_DATA(methodName), J9UTF8_LENGTH(methodSignature), J9UTF8_DATA(methodSignature), receiver);
 			} else {
-				Trc_MethodEntry(thr, J9UTF8_LENGTH(className), J9UTF8_DATA(className), J9UTF8_LENGTH(methodName), J9UTF8_DATA(methodName), J9UTF8_LENGTH(methodSignature), J9UTF8_DATA(methodSignature), receiver);
+				Trc_MethodEntry(thr, J9UTF8_LENGTH(className), J9UTF8_DATA(className), J9UTF8_LENGTH(methodName), J9UTF8_DATA(methodName), J9UTF8_LENGTH(methodSignature), J9UTF8_DATA(methodSignature), 0, "", receiver);
 			}
 
 			if (doParameters) {
+				J9JavaVM *vm = thr->javaVM;
+				const unsigned int maxStringLength = RAS_GLOBAL_FROM_JAVAVM(maxStringLength, vm);
+
+				if ((NULL != receiver)
+					&& (receiverClazz == J9VMJAVALANGSTRING_OR_NULL(vm))
+					&& (0 != maxStringLength)
+					&& !J9UTF8_LITERAL_EQUALS(J9UTF8_DATA(methodName), J9UTF8_LENGTH(methodName), "<init>")
+				) {
+					PORT_ACCESS_FROM_VMC(thr);
+					char utf8Buffer[RAS_MAX_STRING_LENGTH_LIMIT + 1];
+					char outputString[RAS_MAX_STRING_LENGTH_LIMIT + 1];
+					UDATA utf8Length = 0;
+
+					char *utf8String = vm->internalVMFunctions->copyStringToUTF8WithMemAlloc(
+							thr,
+							receiver,
+							0,
+							"",
+							0,
+							utf8Buffer,
+							sizeof(utf8Buffer),
+							&utf8Length);
+
+					if (NULL == utf8String) {
+						sprintf(outputString, "(String)<Memory allocation error>");
+					} else if (utf8Length > maxStringLength) {
+						sprintf(outputString, "(String)\"%.*s\"...", (U_32)maxStringLength, utf8String);
+					} else {
+						sprintf(outputString, "(String)\"%.*s\"", (U_32)utf8Length, utf8String);
+					}
+
+					Trc_MethodEntry(thr, J9UTF8_LENGTH(className), J9UTF8_DATA(className), J9UTF8_LENGTH(methodName), J9UTF8_DATA(methodName), J9UTF8_LENGTH(methodSignature), J9UTF8_DATA(methodSignature), J9UTF8_LENGTH(outputString),  outputString, receiver);
+
+					if (utf8Buffer != utf8String) {
+						j9mem_free_memory(utf8String);
+					}
+				}
 				Trc_MethodArguments(
-						thr, 
+						thr,
 						(U_32)J9UTF8_LENGTH(receiverClassName),
 						J9UTF8_DATA(receiverClassName),
 						receiver,
@@ -498,9 +535,9 @@ traceMethodArgObject(J9VMThread *thr, UDATA* arg0EA, char* cursor, UDATA length)
 			if (NULL == utf8String) {
 				j9str_printf(PORTLIB, cursor, length, "(String)<Memory allocation error>");
 			} else if (utf8Length > maxStringLength) {
-				j9str_printf(PORTLIB, cursor, length, "(String)\"%.*s\"...", (U_32)maxStringLength, utf8String);
+				j9str_printf(PORTLIB, cursor, length, "(String)@%p - \"%.*s\"...", (U_32)maxStringLength, utf8String, object);
 			} else {
-				j9str_printf(PORTLIB, cursor, length, "(String)\"%.*s\"", (U_32)utf8Length, utf8String);
+				j9str_printf(PORTLIB, cursor, length, "@%p - (String)\"%.*s\"", (U_32)utf8Length, utf8String, object);
 			}
 
 			if (utf8Buffer != utf8String) {

runtime/rastrace/mt.tdf

@@ -23,7 +23,7 @@
 Executable=mt
 DATFileName=J9TraceFormat.dat
 
-TraceEntry=Trc_MethodEntry   Overhead=1 Level=5 Group=bytecodeMethods                Template="%.*s.%.*s%.*s bytecode method, this = 0x%zx"
+TraceEntry=Trc_MethodEntry   Overhead=1 Level=5 Group=bytecodeMethods                Template="%.*s.%.*s%.*s bytecode method, this = %.*s 0x%zx,"
 TraceEntry=Trc_MethodEntryC  Overhead=1 Level=5 Group=compiledMethods                Template="%.*s.%.*s%.*s compiled method, this = 0x%zx"
 TraceEntry=Trc_MethodEntryN  Overhead=1 Level=5 Group=nativeMethods                  Template="%.*s.%.*s%.*s native method, this = 0x%zx"
 TraceEntry=Trc_MethodEntryS  Overhead=1 Level=5 Group=bytecodeMethods,staticMethods  Template="%.*s.%.*s%.*s bytecode static method"