hotspot/src/share/vm/asm/assembler.cpp
author zgu
Wed, 07 May 2014 06:03:31 -0700
changeset 24425 53764d2358f9
parent 22234 da823d78ad65
child 25351 7c198a690050
permissions -rw-r--r--
8041415: remove port.{cpp,hpp} files Summary: Hotspot should use standard headers and types Reviewed-by: coleenp, kvn
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/*
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 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "asm/macroAssembler.hpp"
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#include "asm/macroAssembler.inline.hpp"
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#include "asm/codeBuffer.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/atomic.inline.hpp"
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#include "runtime/icache.hpp"
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#include "runtime/os.hpp"
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// Implementation of AbstractAssembler
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//
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// The AbstractAssembler is generating code into a CodeBuffer. To make code generation faster,
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// the assembler keeps a copy of the code buffers boundaries & modifies them when
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// emitting bytes rather than using the code buffers accessor functions all the time.
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// The code buffer is updated via set_code_end(...) after emitting a whole instruction.
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AbstractAssembler::AbstractAssembler(CodeBuffer* code) {
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  if (code == NULL)  return;
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  CodeSection* cs = code->insts();
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  cs->clear_mark();   // new assembler kills old mark
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  if (cs->start() == NULL)  {
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    vm_exit_out_of_memory(0, OOM_MMAP_ERROR, err_msg("CodeCache: no room for %s",
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                                     code->name()));
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  }
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  _code_section = cs;
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  _oop_recorder= code->oop_recorder();
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  DEBUG_ONLY( _short_branch_delta = 0; )
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}
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void AbstractAssembler::set_code_section(CodeSection* cs) {
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  assert(cs->outer() == code_section()->outer(), "sanity");
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  assert(cs->is_allocated(), "need to pre-allocate this section");
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  cs->clear_mark();  // new assembly into this section kills old mark
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  _code_section = cs;
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}
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// Inform CodeBuffer that incoming code and relocation will be for stubs
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address AbstractAssembler::start_a_stub(int required_space) {
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  CodeBuffer*  cb = code();
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  CodeSection* cs = cb->stubs();
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  assert(_code_section == cb->insts(), "not in insts?");
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  if (cs->maybe_expand_to_ensure_remaining(required_space)
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      && cb->blob() == NULL) {
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    return NULL;
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  }
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  set_code_section(cs);
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  return pc();
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}
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// Inform CodeBuffer that incoming code and relocation will be code
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// Should not be called if start_a_stub() returned NULL
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void AbstractAssembler::end_a_stub() {
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  assert(_code_section == code()->stubs(), "not in stubs?");
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  set_code_section(code()->insts());
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}
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// Inform CodeBuffer that incoming code and relocation will be for stubs
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address AbstractAssembler::start_a_const(int required_space, int required_align) {
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  CodeBuffer*  cb = code();
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  CodeSection* cs = cb->consts();
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  assert(_code_section == cb->insts() || _code_section == cb->stubs(), "not in insts/stubs?");
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  address end = cs->end();
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  int pad = -(intptr_t)end & (required_align-1);
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  if (cs->maybe_expand_to_ensure_remaining(pad + required_space)) {
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    if (cb->blob() == NULL)  return NULL;
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    end = cs->end();  // refresh pointer
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  }
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  if (pad > 0) {
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    while (--pad >= 0) { *end++ = 0; }
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    cs->set_end(end);
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  }
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  set_code_section(cs);
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  return end;
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}
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// Inform CodeBuffer that incoming code and relocation will be code
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// in section cs (insts or stubs).
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void AbstractAssembler::end_a_const(CodeSection* cs) {
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  assert(_code_section == code()->consts(), "not in consts?");
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  set_code_section(cs);
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}
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void AbstractAssembler::flush() {
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  ICache::invalidate_range(addr_at(0), offset());
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}
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void AbstractAssembler::bind(Label& L) {
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  if (L.is_bound()) {
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    // Assembler can bind a label more than once to the same place.
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    guarantee(L.loc() == locator(), "attempt to redefine label");
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    return;
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  }
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  L.bind_loc(locator());
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  L.patch_instructions((MacroAssembler*)this);
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}
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void AbstractAssembler::generate_stack_overflow_check(int frame_size_in_bytes) {
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  if (UseStackBanging) {
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    // Each code entry causes one stack bang n pages down the stack where n
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    // is configurable by StackShadowPages.  The setting depends on the maximum
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    // depth of VM call stack or native before going back into java code,
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    // since only java code can raise a stack overflow exception using the
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    // stack banging mechanism.  The VM and native code does not detect stack
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    // overflow.
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    // The code in JavaCalls::call() checks that there is at least n pages
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    // available, so all entry code needs to do is bang once for the end of
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    // this shadow zone.
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    // The entry code may need to bang additional pages if the framesize
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    // is greater than a page.
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    const int page_size = os::vm_page_size();
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    int bang_end = StackShadowPages * page_size;
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    // This is how far the previous frame's stack banging extended.
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    const int bang_end_safe = bang_end;
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    if (frame_size_in_bytes > page_size) {
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      bang_end += frame_size_in_bytes;
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    }
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    int bang_offset = bang_end_safe;
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    while (bang_offset <= bang_end) {
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      // Need at least one stack bang at end of shadow zone.
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      bang_stack_with_offset(bang_offset);
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      bang_offset += page_size;
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    }
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  } // end (UseStackBanging)
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}
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void Label::add_patch_at(CodeBuffer* cb, int branch_loc) {
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  assert(_loc == -1, "Label is unbound");
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  if (_patch_index < PatchCacheSize) {
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    _patches[_patch_index] = branch_loc;
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  } else {
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    if (_patch_overflow == NULL) {
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      _patch_overflow = cb->create_patch_overflow();
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    }
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    _patch_overflow->push(branch_loc);
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  }
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  ++_patch_index;
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}
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void Label::patch_instructions(MacroAssembler* masm) {
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  assert(is_bound(), "Label is bound");
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  CodeBuffer* cb = masm->code();
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  int target_sect = CodeBuffer::locator_sect(loc());
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  address target = cb->locator_address(loc());
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  while (_patch_index > 0) {
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    --_patch_index;
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    int branch_loc;
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    if (_patch_index >= PatchCacheSize) {
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      branch_loc = _patch_overflow->pop();
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    } else {
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      branch_loc = _patches[_patch_index];
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    }
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    int branch_sect = CodeBuffer::locator_sect(branch_loc);
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    address branch = cb->locator_address(branch_loc);
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    if (branch_sect == CodeBuffer::SECT_CONSTS) {
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      // The thing to patch is a constant word.
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      *(address*)branch = target;
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      continue;
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    }
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#ifdef ASSERT
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    // Cross-section branches only work if the
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    // intermediate section boundaries are frozen.
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    if (target_sect != branch_sect) {
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      for (int n = MIN2(target_sect, branch_sect),
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               nlimit = (target_sect + branch_sect) - n;
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           n < nlimit; n++) {
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        CodeSection* cs = cb->code_section(n);
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        assert(cs->is_frozen(), "cross-section branch needs stable offsets");
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      }
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    }
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#endif //ASSERT
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    // Push the target offset into the branch instruction.
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    masm->pd_patch_instruction(branch, target);
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  }
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}
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struct DelayedConstant {
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  typedef void (*value_fn_t)();
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  BasicType type;
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  intptr_t value;
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  value_fn_t value_fn;
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  // This limit of 20 is generous for initial uses.
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  // The limit needs to be large enough to store the field offsets
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  // into classes which do not have statically fixed layouts.
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  // (Initial use is for method handle object offsets.)
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  // Look for uses of "delayed_value" in the source code
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  // and make sure this number is generous enough to handle all of them.
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  enum { DC_LIMIT = 20 };
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  static DelayedConstant delayed_constants[DC_LIMIT];
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  static DelayedConstant* add(BasicType type, value_fn_t value_fn);
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  bool match(BasicType t, value_fn_t cfn) {
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    return type == t && value_fn == cfn;
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  }
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  static void update_all();
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};
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DelayedConstant DelayedConstant::delayed_constants[DC_LIMIT];
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// Default C structure initialization rules have the following effect here:
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// = { { (BasicType)0, (intptr_t)NULL }, ... };
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DelayedConstant* DelayedConstant::add(BasicType type,
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                                      DelayedConstant::value_fn_t cfn) {
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  for (int i = 0; i < DC_LIMIT; i++) {
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    DelayedConstant* dcon = &delayed_constants[i];
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    if (dcon->match(type, cfn))
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      return dcon;
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    if (dcon->value_fn == NULL) {
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      // (cmpxchg not because this is multi-threaded but because I'm paranoid)
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      if (Atomic::cmpxchg_ptr(CAST_FROM_FN_PTR(void*, cfn), &dcon->value_fn, NULL) == NULL) {
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        dcon->type = type;
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        return dcon;
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      }
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    }
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  }
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  // If this assert is hit (in pre-integration testing!) then re-evaluate
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  // the comment on the definition of DC_LIMIT.
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  guarantee(false, "too many delayed constants");
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  return NULL;
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}
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void DelayedConstant::update_all() {
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  for (int i = 0; i < DC_LIMIT; i++) {
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    DelayedConstant* dcon = &delayed_constants[i];
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    if (dcon->value_fn != NULL && dcon->value == 0) {
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      typedef int     (*int_fn_t)();
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      typedef address (*address_fn_t)();
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      switch (dcon->type) {
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      case T_INT:     dcon->value = (intptr_t) ((int_fn_t)    dcon->value_fn)(); break;
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      case T_ADDRESS: dcon->value = (intptr_t) ((address_fn_t)dcon->value_fn)(); break;
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      }
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    }
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  }
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}
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RegisterOrConstant AbstractAssembler::delayed_value(int(*value_fn)(), Register tmp, int offset) {
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  intptr_t val = (intptr_t) (*value_fn)();
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  if (val != 0)  return val + offset;
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  return delayed_value_impl(delayed_value_addr(value_fn), tmp, offset);
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}
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RegisterOrConstant AbstractAssembler::delayed_value(address(*value_fn)(), Register tmp, int offset) {
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  intptr_t val = (intptr_t) (*value_fn)();
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  if (val != 0)  return val + offset;
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  return delayed_value_impl(delayed_value_addr(value_fn), tmp, offset);
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}
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intptr_t* AbstractAssembler::delayed_value_addr(int(*value_fn)()) {
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  DelayedConstant* dcon = DelayedConstant::add(T_INT, (DelayedConstant::value_fn_t) value_fn);
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  return &dcon->value;
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}
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intptr_t* AbstractAssembler::delayed_value_addr(address(*value_fn)()) {
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  DelayedConstant* dcon = DelayedConstant::add(T_ADDRESS, (DelayedConstant::value_fn_t) value_fn);
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  return &dcon->value;
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}
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void AbstractAssembler::update_delayed_values() {
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  DelayedConstant::update_all();
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}
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1
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void AbstractAssembler::block_comment(const char* comment) {
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  if (sect() == CodeBuffer::SECT_INSTS) {
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    code_section()->outer()->block_comment(offset(), comment);
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  }
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}
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const char* AbstractAssembler::code_string(const char* str) {
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  if (sect() == CodeBuffer::SECT_INSTS || sect() == CodeBuffer::SECT_STUBS) {
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    return code_section()->outer()->code_string(str);
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  }
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  return NULL;
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}
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   299
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bool MacroAssembler::needs_explicit_null_check(intptr_t offset) {
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  // Exception handler checks the nmethod's implicit null checks table
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  // only when this method returns false.
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#ifdef _LP64
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  if (UseCompressedOops && Universe::narrow_oop_base() != NULL) {
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    assert (Universe::heap() != NULL, "java heap should be initialized");
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    // The first page after heap_base is unmapped and
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    // the 'offset' is equal to [heap_base + offset] for
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    // narrow oop implicit null checks.
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    uintptr_t base = (uintptr_t)Universe::narrow_oop_base();
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    if ((uintptr_t)offset >= base) {
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      // Normalize offset for the next check.
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      offset = (intptr_t)(pointer_delta((void*)offset, (void*)base, 1));
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    }
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  }
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#endif
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  return offset < 0 || os::vm_page_size() <= offset;
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}