8277102: Dubious PrintCompilation output

Reviewed-by: thartmann, dnsimon

Author: y1yang0

src/hotspot/share/code/nmethod.cpp

@@ -924,7 +924,7 @@ void nmethod::print_on(outputStream* st, const char* msg) const {
       CompileTask::print(st, this, msg, /*short_form:*/ true);
       st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
     } else {
-      CompileTask::print(st, this, msg, /*short_form:*/ false, /* cr */ true, /* timestamp */ false);
+      CompileTask::print(st, this, msg, /*short_form:*/ false);
     }
   }
 }

src/hotspot/share/compiler/compileTask.cpp

@@ -236,13 +236,11 @@ void CompileTask::print_tty() {
 // CompileTask::print_impl
 void CompileTask::print_impl(outputStream* st, Method* method, int compile_id, int comp_level,
                              bool is_osr_method, int osr_bci, bool is_blocking,
-                             const char* msg, bool short_form, bool cr, bool timestamp,
+                             const char* msg, bool short_form, bool cr,
                              jlong time_queued, jlong time_started) {
   if (!short_form) {
-    if (timestamp) {
-      // Print current time
-      st->print("%7d ", (int)tty->time_stamp().milliseconds());
-    }
+    // Print current time
+    st->print("%7d ", (int)tty->time_stamp().milliseconds());
     if (Verbose && time_queued != 0) {
       // Print time in queue and time being processed by compiler thread
       jlong now = os::elapsed_counter();

src/hotspot/share/compiler/compileTask.hpp

@@ -187,16 +187,16 @@ class CompileTask : public CHeapObj<mtCompiler> {
 private:
   static void  print_impl(outputStream* st, Method* method, int compile_id, int comp_level,
                                       bool is_osr_method = false, int osr_bci = -1, bool is_blocking = false,
-                                      const char* msg = NULL, bool short_form = false, bool cr = true, bool timestamp = true,
+                                      const char* msg = NULL, bool short_form = false, bool cr = true,
                                       jlong time_queued = 0, jlong time_started = 0);
 
 public:
   void         print(outputStream* st = tty, const char* msg = NULL, bool short_form = false, bool cr = true);
   void         print_ul(const char* msg = NULL);
-  static void  print(outputStream* st, const nmethod* nm, const char* msg = NULL, bool short_form = false, bool cr = true, bool timestamp = true) {
+  static void  print(outputStream* st, const nmethod* nm, const char* msg = NULL, bool short_form = false, bool cr = true) {
     print_impl(st, nm->method(), nm->compile_id(), nm->comp_level(),
                            nm->is_osr_method(), nm->is_osr_method() ? nm->osr_entry_bci() : -1, /*is_blocking*/ false,
-                           msg, short_form, cr, timestamp);
+                           msg, short_form, cr);
   }
   static void  print_ul(const nmethod* nm, const char* msg = NULL);
 

test/hotspot/jtreg/compiler/jvmci/compilerToVM/DisassembleCodeBlobTest.java

@@ -101,7 +101,16 @@ private void check(CompileCodeTestCase testCase) {
         // Therefore compare strings 2 and 3.
         String str2 = CompilerToVMHelper.disassembleCodeBlob(installedCode);
         String str3 = CompilerToVMHelper.disassembleCodeBlob(installedCode);
-        Asserts.assertEQ(str2, str3,
+        String[] str2Lines = str2.split(System.lineSeparator());
+        String[] str3Lines = str3.split(System.lineSeparator());
+        // skip the first two lines since it contains a timestamp that may vary from different invocations
+        // <empty-line>
+        // Compiled method (c2)     309  463       4       compiler.jvmci.compilerToVM.CompileCodeTestCase$Dummy::staticMethod (1 bytes)
+        // <empty-line>
+        // Compiled method (c2)     310  463       4       compiler.jvmci.compilerToVM.CompileCodeTestCase$Dummy::staticMethod (1 bytes)
+        for (int i = 2; i < str2Lines.length; i++) {
+            Asserts.assertEQ(str2Lines[i], str3Lines[i],
                 testCase + " : 3nd invocation returned different value from 2nd");
+        }
     }
 }