8204680: Disassembly does not display code strings in stubs

Reviewed-by: kvn

src/hotspot/share/asm/codeBuffer.hpp

@@ -337,6 +337,7 @@ public:
 
 class CodeBuffer: public StackObj {
   friend class CodeSection;
+  friend class StubCodeGenerator;
 
  private:
   // CodeBuffers must be allocated on the stack except for a single

src/hotspot/share/compiler/disassembler.cpp

@@ -155,6 +155,7 @@ class decode_env {
   CodeStrings   _strings;
   outputStream* _output;
   address       _start, _end;
+  ptrdiff_t     _offset;
 
   char          _option_buf[512];
   char          _print_raw;
@@ -191,7 +192,8 @@ class decode_env {
   void print_address(address value);
 
  public:
-  decode_env(CodeBlob* code, outputStream* output, CodeStrings c = CodeStrings());
+  decode_env(CodeBlob* code, outputStream* output,
+             CodeStrings c = CodeStrings(), ptrdiff_t offset = 0);
 
   address decode_instructions(address start, address end);
 
@@ -221,13 +223,15 @@ class decode_env {
   const char* options() { return _option_buf; }
 };
 
-decode_env::decode_env(CodeBlob* code, outputStream* output, CodeStrings c) {
+decode_env::decode_env(CodeBlob* code, outputStream* output, CodeStrings c,
+                       ptrdiff_t offset) {
   memset(this, 0, sizeof(*this)); // Beware, this zeroes bits of fields.
   _output = output ? output : tty;
   _code = code;
   if (code != NULL && code->is_nmethod())
     _nm = (nmethod*) code;
   _strings.copy(c);
+  _offset = offset;
 
   // by default, output pc but not bytes:
   _print_pc       = true;
@@ -354,7 +358,7 @@ void decode_env::print_insn_labels() {
   if (cb != NULL) {
     cb->print_block_comment(st, p);
   }
-  _strings.print_block_comment(st, (intptr_t)(p - _start));
+  _strings.print_block_comment(st, (intptr_t)(p - _start + _offset));
   if (_print_pc) {
     st->print("  " PTR_FORMAT ": ", p2i(p));
   }
@@ -507,10 +511,11 @@ void Disassembler::decode(CodeBlob* cb, outputStream* st) {
   env.decode_instructions(cb->code_begin(), cb->code_end());
 }
 
-void Disassembler::decode(address start, address end, outputStream* st, CodeStrings c) {
+void Disassembler::decode(address start, address end, outputStream* st, CodeStrings c,
+                          ptrdiff_t offset) {
   ttyLocker ttyl;
   if (!load_library())  return;
-  decode_env env(CodeCache::find_blob_unsafe(start), st, c);
+  decode_env env(CodeCache::find_blob_unsafe(start), st, c, offset);
   env.decode_instructions(start, end);
 }
 

src/hotspot/share/compiler/disassembler.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -75,7 +75,8 @@ class Disassembler {
   }
   static void decode(CodeBlob *cb,               outputStream* st = NULL);
   static void decode(nmethod* nm,                outputStream* st = NULL);
-  static void decode(address begin, address end, outputStream* st = NULL, CodeStrings c = CodeStrings());
+  static void decode(address begin, address end, outputStream* st = NULL,
+                     CodeStrings c = CodeStrings(), ptrdiff_t offset = 0);
 };
 
 #endif // SHARE_VM_COMPILER_DISASSEMBLER_HPP

src/hotspot/share/runtime/stubCodeGenerator.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -71,7 +71,7 @@ StubCodeGenerator::StubCodeGenerator(CodeBuffer* code, bool print_code) {
 }
 
 StubCodeGenerator::~StubCodeGenerator() {
-  if (_print_code) {
+  if (PRODUCT_ONLY(_print_code) NOT_PRODUCT(true)) {
     CodeBuffer* cbuf = _masm->code();
     CodeBlob*   blob = CodeCache::find_blob_unsafe(cbuf->insts()->start());
     if (blob != NULL) {
@@ -86,9 +86,19 @@ void StubCodeGenerator::stub_prolog(StubCodeDesc* cdesc) {
 
 void StubCodeGenerator::stub_epilog(StubCodeDesc* cdesc) {
   if (_print_code) {
+    CodeStrings cs;
+    ptrdiff_t offset = 0;
+#ifndef PRODUCT
+    // Find the code strings in the outer CodeBuffer.
+    CodeBuffer *outer_cbuf = _masm->code_section()->outer();
+    cs = outer_cbuf->strings();
+    // The offset from the start of the outer CodeBuffer to the start
+    // of this stub.
+    offset = cdesc->begin() - outer_cbuf->insts()->start();
+#endif
     cdesc->print();
     tty->cr();
-    Disassembler::decode(cdesc->begin(), cdesc->end());
+    Disassembler::decode(cdesc->begin(), cdesc->end(), NULL, cs, offset);
     tty->cr();
   }
 }