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      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 
     33 namespace v8 {
     34 namespace internal {
     35 
     36 // -------------------------------------------------------------------------
     37 // Result implementation.
     38 
     39 void 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 
     57 void 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 
     87 Result 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