| // 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" |
| |
| #include "codegen-inl.h" |
| #include "register-allocator-inl.h" |
| |
| namespace v8 { namespace internal { |
| |
| // ------------------------------------------------------------------------- |
| // Result implementation. |
| |
| void Result::ToRegister() { |
| ASSERT(is_valid()); |
| if (is_constant()) { |
| Result fresh = cgen_->allocator()->Allocate(); |
| ASSERT(fresh.is_valid()); |
| if (cgen_->IsUnsafeSmi(handle())) { |
| cgen_->LoadUnsafeSmi(fresh.reg(), handle()); |
| } else { |
| cgen_->masm()->Set(fresh.reg(), Immediate(handle())); |
| } |
| // This result becomes a copy of the fresh one. |
| *this = fresh; |
| } |
| ASSERT(is_register()); |
| } |
| |
| |
| void Result::ToRegister(Register target) { |
| ASSERT(is_valid()); |
| if (!is_register() || !reg().is(target)) { |
| Result fresh = cgen_->allocator()->Allocate(target); |
| ASSERT(fresh.is_valid()); |
| if (is_register()) { |
| cgen_->masm()->mov(fresh.reg(), reg()); |
| } else { |
| ASSERT(is_constant()); |
| if (cgen_->IsUnsafeSmi(handle())) { |
| cgen_->LoadUnsafeSmi(fresh.reg(), handle()); |
| } else { |
| cgen_->masm()->Set(fresh.reg(), Immediate(handle())); |
| } |
| } |
| *this = fresh; |
| } else if (is_register() && reg().is(target)) { |
| ASSERT(cgen_->has_valid_frame()); |
| cgen_->frame()->Spill(target); |
| ASSERT(cgen_->allocator()->count(target) == 1); |
| } |
| ASSERT(is_register()); |
| ASSERT(reg().is(target)); |
| } |
| |
| |
| // ------------------------------------------------------------------------- |
| // RegisterAllocator implementation. |
| |
| RegisterFile RegisterAllocator::Reserved() { |
| RegisterFile reserved; |
| reserved.Use(esp); |
| reserved.Use(ebp); |
| reserved.Use(esi); |
| return reserved; |
| } |
| |
| |
| void RegisterAllocator::UnuseReserved(RegisterFile* register_file) { |
| register_file->ref_counts_[esp.code()] = 0; |
| register_file->ref_counts_[ebp.code()] = 0; |
| register_file->ref_counts_[esi.code()] = 0; |
| } |
| |
| |
| void RegisterAllocator::Initialize() { |
| Reset(); |
| // The following register is live on function entry, saved in the |
| // frame, and available for allocation during execution. |
| Use(edi); // JS function. |
| } |
| |
| |
| void RegisterAllocator::Reset() { |
| registers_.Reset(); |
| // The following registers are live on function entry and reserved |
| // during execution. |
| Use(esp); // Stack pointer. |
| Use(ebp); // Frame pointer (caller's frame pointer on entry). |
| Use(esi); // Context (callee's context on entry). |
| } |
| |
| |
| 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(cgen_); |
| } |
| return result; |
| } |
| |
| |
| } } // namespace v8::internal |