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