1// Copyright 2008 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28#include "v8.h"
29
30#include "codegen-inl.h"
31#include "register-allocator-inl.h"
32
33namespace v8 {
34namespace internal {
35
36// -------------------------------------------------------------------------
37// Result implementation.
38
39void Result::ToRegister() {
40  ASSERT(is_valid());
41  if (is_constant()) {
42    Result fresh = CodeGeneratorScope::Current()->allocator()->Allocate();
43    ASSERT(fresh.is_valid());
44    if (CodeGeneratorScope::Current()->IsUnsafeSmi(handle())) {
45      CodeGeneratorScope::Current()->MoveUnsafeSmi(fresh.reg(), handle());
46    } else {
47      CodeGeneratorScope::Current()->masm()->Set(fresh.reg(),
48                                                 Immediate(handle()));
49    }
50    // This result becomes a copy of the fresh one.
51    *this = fresh;
52  }
53  ASSERT(is_register());
54}
55
56
57void Result::ToRegister(Register target) {
58  ASSERT(is_valid());
59  if (!is_register() || !reg().is(target)) {
60    Result fresh = CodeGeneratorScope::Current()->allocator()->Allocate(target);
61    ASSERT(fresh.is_valid());
62    if (is_register()) {
63      CodeGeneratorScope::Current()->masm()->mov(fresh.reg(), reg());
64    } else {
65      ASSERT(is_constant());
66      if (CodeGeneratorScope::Current()->IsUnsafeSmi(handle())) {
67        CodeGeneratorScope::Current()->MoveUnsafeSmi(fresh.reg(), handle());
68      } else {
69        CodeGeneratorScope::Current()->masm()->Set(fresh.reg(),
70                                                   Immediate(handle()));
71      }
72    }
73    *this = fresh;
74  } else if (is_register() && reg().is(target)) {
75    ASSERT(CodeGeneratorScope::Current()->has_valid_frame());
76    CodeGeneratorScope::Current()->frame()->Spill(target);
77    ASSERT(CodeGeneratorScope::Current()->allocator()->count(target) == 1);
78  }
79  ASSERT(is_register());
80  ASSERT(reg().is(target));
81}
82
83
84// -------------------------------------------------------------------------
85// RegisterAllocator implementation.
86
87Result RegisterAllocator::AllocateByteRegisterWithoutSpilling() {
88  Result result = AllocateWithoutSpilling();
89  // Check that the register is a byte register.  If not, unuse the
90  // register if valid and return an invalid result.
91  if (result.is_valid() && !result.reg().is_byte_register()) {
92    result.Unuse();
93    return Result();
94  }
95  return result;
96}
97
98
99} }  // namespace v8::internal
100