| // Copyright 2008 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| |
| #if defined(V8_TARGET_ARCH_IA32) |
| |
| #include "codegen-inl.h" |
| #include "register-allocator-inl.h" |
| #include "virtual-frame-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // ------------------------------------------------------------------------- |
| // Result implementation. |
| |
| void Result::ToRegister() { |
| ASSERT(is_valid()); |
| if (is_constant()) { |
| Result fresh = CodeGeneratorScope::Current()->allocator()->Allocate(); |
| ASSERT(fresh.is_valid()); |
| if (is_untagged_int32()) { |
| fresh.set_untagged_int32(true); |
| if (handle()->IsSmi()) { |
| CodeGeneratorScope::Current()->masm()->Set( |
| fresh.reg(), |
| Immediate(Smi::cast(*handle())->value())); |
| } else if (handle()->IsHeapNumber()) { |
| double double_value = HeapNumber::cast(*handle())->value(); |
| int32_t value = DoubleToInt32(double_value); |
| if (double_value == 0 && signbit(double_value)) { |
| // Negative zero must not be converted to an int32 unless |
| // the context allows it. |
| CodeGeneratorScope::Current()->unsafe_bailout_->Branch(equal); |
| CodeGeneratorScope::Current()->unsafe_bailout_->Branch(not_equal); |
| } else if (double_value == value) { |
| CodeGeneratorScope::Current()->masm()->Set( |
| fresh.reg(), Immediate(value)); |
| } else { |
| CodeGeneratorScope::Current()->unsafe_bailout_->Branch(equal); |
| CodeGeneratorScope::Current()->unsafe_bailout_->Branch(not_equal); |
| } |
| } else { |
| // Constant is not a number. This was not predicted by AST analysis. |
| CodeGeneratorScope::Current()->unsafe_bailout_->Branch(equal); |
| CodeGeneratorScope::Current()->unsafe_bailout_->Branch(not_equal); |
| } |
| } else if (CodeGeneratorScope::Current()->IsUnsafeSmi(handle())) { |
| CodeGeneratorScope::Current()->MoveUnsafeSmi(fresh.reg(), handle()); |
| } else { |
| CodeGeneratorScope::Current()->masm()->Set(fresh.reg(), |
| Immediate(handle())); |
| } |
| // This result becomes a copy of the fresh one. |
| fresh.set_type_info(type_info()); |
| *this = fresh; |
| } |
| ASSERT(is_register()); |
| } |
| |
| |
| void Result::ToRegister(Register target) { |
| ASSERT(is_valid()); |
| if (!is_register() || !reg().is(target)) { |
| Result fresh = CodeGeneratorScope::Current()->allocator()->Allocate(target); |
| ASSERT(fresh.is_valid()); |
| if (is_register()) { |
| CodeGeneratorScope::Current()->masm()->mov(fresh.reg(), reg()); |
| } else { |
| ASSERT(is_constant()); |
| if (is_untagged_int32()) { |
| if (handle()->IsSmi()) { |
| CodeGeneratorScope::Current()->masm()->Set( |
| fresh.reg(), |
| Immediate(Smi::cast(*handle())->value())); |
| } else { |
| ASSERT(handle()->IsHeapNumber()); |
| double double_value = HeapNumber::cast(*handle())->value(); |
| int32_t value = DoubleToInt32(double_value); |
| if (double_value == 0 && signbit(double_value)) { |
| // Negative zero must not be converted to an int32 unless |
| // the context allows it. |
| CodeGeneratorScope::Current()->unsafe_bailout_->Branch(equal); |
| CodeGeneratorScope::Current()->unsafe_bailout_->Branch(not_equal); |
| } else if (double_value == value) { |
| CodeGeneratorScope::Current()->masm()->Set( |
| fresh.reg(), Immediate(value)); |
| } else { |
| CodeGeneratorScope::Current()->unsafe_bailout_->Branch(equal); |
| CodeGeneratorScope::Current()->unsafe_bailout_->Branch(not_equal); |
| } |
| } |
| } else { |
| if (CodeGeneratorScope::Current()->IsUnsafeSmi(handle())) { |
| CodeGeneratorScope::Current()->MoveUnsafeSmi(fresh.reg(), handle()); |
| } else { |
| CodeGeneratorScope::Current()->masm()->Set(fresh.reg(), |
| Immediate(handle())); |
| } |
| } |
| } |
| fresh.set_type_info(type_info()); |
| fresh.set_untagged_int32(is_untagged_int32()); |
| *this = fresh; |
| } else if (is_register() && reg().is(target)) { |
| ASSERT(CodeGeneratorScope::Current()->has_valid_frame()); |
| CodeGeneratorScope::Current()->frame()->Spill(target); |
| ASSERT(CodeGeneratorScope::Current()->allocator()->count(target) == 1); |
| } |
| ASSERT(is_register()); |
| ASSERT(reg().is(target)); |
| } |
| |
| |
| // ------------------------------------------------------------------------- |
| // RegisterAllocator implementation. |
| |
| Result RegisterAllocator::AllocateByteRegisterWithoutSpilling() { |
| Result result = AllocateWithoutSpilling(); |
| // Check that the register is a byte register. If not, unuse the |
| // register if valid and return an invalid result. |
| if (result.is_valid() && !result.reg().is_byte_register()) { |
| result.Unuse(); |
| return Result(); |
| } |
| return result; |
| } |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_TARGET_ARCH_IA32 |