1 /*
   2  * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "asm/macroAssembler.hpp"
  27 #include "asm/macroAssembler.inline.hpp"
  28 #include "code/codeCache.hpp"
  29 #include "compiler/disassembler.hpp"
  30 #include "oops/oop.inline.hpp"
  31 #include "prims/forte.hpp"
  32 #include "runtime/stubCodeGenerator.hpp"
  33 
  34 
  35 // Implementation of StubCodeDesc
  36 
  37 StubCodeDesc* StubCodeDesc::_list = NULL;
  38 bool          StubCodeDesc::_frozen = false;
  39 
  40 StubCodeDesc* StubCodeDesc::desc_for(address pc) {
  41   StubCodeDesc* p = _list;
  42   while (p != NULL && !p->contains(pc)) {
  43     p = p->_next;
  44   }
  45   return p;
  46 }
  47 
  48 const char* StubCodeDesc::name_for(address pc) {
  49   StubCodeDesc* p = desc_for(pc);
  50   return p == NULL ? NULL : p->name();
  51 }
  52 
  53 
  54 void StubCodeDesc::freeze() {
  55   assert(!_frozen, "repeated freeze operation");
  56   _frozen = true;
  57 }
  58 
  59 void StubCodeDesc::print_on(outputStream* st) const {
  60   st->print("%s", group());
  61   st->print("::");
  62   st->print("%s", name());
  63   st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT "[ (%d bytes)", p2i(begin()), p2i(end()), size_in_bytes());
  64 }
  65 
  66 void StubCodeDesc::print() const { print_on(tty); }
  67 
  68 // Implementation of StubCodeGenerator
  69 
  70 StubCodeGenerator::StubCodeGenerator(CodeBuffer* code, bool print_code) {
  71   _masm = new MacroAssembler(code );
  72   _print_code = PrintStubCode || print_code;
  73 }
  74 
  75 StubCodeGenerator::~StubCodeGenerator() {
  76   if (PRODUCT_ONLY(_print_code) NOT_PRODUCT(true)) {
  77     CodeBuffer* cbuf = _masm->code();
  78     CodeBlob*   blob = CodeCache::find_blob_unsafe(cbuf->insts()->start());
  79     if (blob != NULL) {
  80       blob->set_strings(cbuf->strings());
  81     }
  82   }
  83 }
  84 
  85 void StubCodeGenerator::stub_prolog(StubCodeDesc* cdesc) {
  86   // default implementation - do nothing
  87 }
  88 
  89 void StubCodeGenerator::stub_epilog(StubCodeDesc* cdesc) {
  90   if (_print_code) {
  91     CodeStrings cs;
  92     ptrdiff_t offset = 0;
  93 #ifndef PRODUCT
  94     // Find the code strings in the outer CodeBuffer.
  95     CodeBuffer *outer_cbuf = _masm->code_section()->outer();
  96     cs = outer_cbuf->strings();
  97     // The offset from the start of the outer CodeBuffer to the start
  98     // of this stub.
  99     offset = cdesc->begin() - outer_cbuf->insts()->start();
 100 #endif
 101     cdesc->print();
 102     tty->cr();
 103     Disassembler::decode(cdesc->begin(), cdesc->end(), NULL, cs, offset);
 104     tty->cr();
 105   }
 106 }
 107 
 108 
 109 // Implementation of CodeMark
 110 
 111 StubCodeMark::StubCodeMark(StubCodeGenerator* cgen, const char* group, const char* name) {
 112   _cgen  = cgen;
 113   _cdesc = new StubCodeDesc(group, name, _cgen->assembler()->pc());
 114   _cgen->stub_prolog(_cdesc);
 115   // define the stub's beginning (= entry point) to be after the prolog:
 116   _cdesc->set_begin(_cgen->assembler()->pc());
 117 }
 118 
 119 StubCodeMark::~StubCodeMark() {
 120   _cgen->assembler()->flush();
 121   _cdesc->set_end(_cgen->assembler()->pc());
 122   assert(StubCodeDesc::_list == _cdesc, "expected order on list");
 123   _cgen->stub_epilog(_cdesc);
 124   Forte::register_stub(_cdesc->name(), _cdesc->begin(), _cdesc->end());
 125 
 126   if (JvmtiExport::should_post_dynamic_code_generated()) {
 127     JvmtiExport::post_dynamic_code_generated(_cdesc->name(), _cdesc->begin(), _cdesc->end());
 128   }
 129 }