Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1 | // Copyright 2010 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 | #ifndef V8_VIRTUAL_FRAME_HEAVY_INL_H_ |
| 29 | #define V8_VIRTUAL_FRAME_HEAVY_INL_H_ |
| 30 | |
| 31 | #include "type-info.h" |
| 32 | #include "register-allocator.h" |
| 33 | #include "scopes.h" |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 34 | #include "register-allocator-inl.h" |
| 35 | #include "codegen-inl.h" |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 36 | |
| 37 | namespace v8 { |
| 38 | namespace internal { |
| 39 | |
| 40 | // On entry to a function, the virtual frame already contains the receiver, |
| 41 | // the parameters, and a return address. All frame elements are in memory. |
| 42 | VirtualFrame::VirtualFrame() |
| 43 | : elements_(parameter_count() + local_count() + kPreallocatedElements), |
| 44 | stack_pointer_(parameter_count() + 1) { // 0-based index of TOS. |
| 45 | for (int i = 0; i <= stack_pointer_; i++) { |
| 46 | elements_.Add(FrameElement::MemoryElement(TypeInfo::Unknown())); |
| 47 | } |
| 48 | for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) { |
| 49 | register_locations_[i] = kIllegalIndex; |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | |
| 54 | // When cloned, a frame is a deep copy of the original. |
| 55 | VirtualFrame::VirtualFrame(VirtualFrame* original) |
| 56 | : elements_(original->element_count()), |
| 57 | stack_pointer_(original->stack_pointer_) { |
| 58 | elements_.AddAll(original->elements_); |
| 59 | // Copy register locations from original. |
| 60 | memcpy(®ister_locations_, |
| 61 | original->register_locations_, |
| 62 | sizeof(register_locations_)); |
| 63 | } |
| 64 | |
| 65 | |
| 66 | void VirtualFrame::PushFrameSlotAt(int index) { |
| 67 | elements_.Add(CopyElementAt(index)); |
| 68 | } |
| 69 | |
| 70 | |
| 71 | void VirtualFrame::Push(Register reg, TypeInfo info) { |
| 72 | if (is_used(reg)) { |
| 73 | int index = register_location(reg); |
| 74 | FrameElement element = CopyElementAt(index, info); |
| 75 | elements_.Add(element); |
| 76 | } else { |
| 77 | Use(reg, element_count()); |
| 78 | FrameElement element = |
| 79 | FrameElement::RegisterElement(reg, FrameElement::NOT_SYNCED, info); |
| 80 | elements_.Add(element); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | |
| 85 | void VirtualFrame::Push(Handle<Object> value) { |
| 86 | FrameElement element = |
| 87 | FrameElement::ConstantElement(value, FrameElement::NOT_SYNCED); |
| 88 | elements_.Add(element); |
| 89 | } |
| 90 | |
| 91 | |
| 92 | bool VirtualFrame::Equals(VirtualFrame* other) { |
| 93 | #ifdef DEBUG |
| 94 | for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) { |
| 95 | if (register_location(i) != other->register_location(i)) { |
| 96 | return false; |
| 97 | } |
| 98 | } |
| 99 | if (element_count() != other->element_count()) return false; |
| 100 | #endif |
| 101 | if (stack_pointer_ != other->stack_pointer_) return false; |
| 102 | for (int i = 0; i < element_count(); i++) { |
| 103 | if (!elements_[i].Equals(other->elements_[i])) return false; |
| 104 | } |
| 105 | |
| 106 | return true; |
| 107 | } |
| 108 | |
| 109 | |
| 110 | void VirtualFrame::SetTypeForLocalAt(int index, TypeInfo info) { |
| 111 | elements_[local0_index() + index].set_type_info(info); |
| 112 | } |
| 113 | |
| 114 | |
| 115 | // Make the type of all elements be MEMORY. |
| 116 | void VirtualFrame::SpillAll() { |
| 117 | for (int i = 0; i < element_count(); i++) { |
| 118 | SpillElementAt(i); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | |
| 123 | void VirtualFrame::PrepareForReturn() { |
| 124 | // Spill all locals. This is necessary to make sure all locals have |
| 125 | // the right value when breaking at the return site in the debugger. |
| 126 | for (int i = 0; i < expression_base_index(); i++) { |
| 127 | SpillElementAt(i); |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | |
| 132 | void VirtualFrame::SetTypeForParamAt(int index, TypeInfo info) { |
| 133 | elements_[param0_index() + index].set_type_info(info); |
| 134 | } |
| 135 | |
| 136 | |
| 137 | void VirtualFrame::Nip(int num_dropped) { |
| 138 | ASSERT(num_dropped >= 0); |
| 139 | if (num_dropped == 0) return; |
| 140 | Result tos = Pop(); |
| 141 | if (num_dropped > 1) { |
| 142 | Drop(num_dropped - 1); |
| 143 | } |
| 144 | SetElementAt(0, &tos); |
| 145 | } |
| 146 | |
| 147 | |
| 148 | void VirtualFrame::Push(Smi* value) { |
| 149 | Push(Handle<Object> (value)); |
| 150 | } |
| 151 | |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 152 | |
| 153 | int VirtualFrame::register_location(Register reg) { |
| 154 | return register_locations_[RegisterAllocator::ToNumber(reg)]; |
| 155 | } |
| 156 | |
| 157 | |
| 158 | void VirtualFrame::set_register_location(Register reg, int index) { |
| 159 | register_locations_[RegisterAllocator::ToNumber(reg)] = index; |
| 160 | } |
| 161 | |
| 162 | |
| 163 | bool VirtualFrame::is_used(Register reg) { |
| 164 | return register_locations_[RegisterAllocator::ToNumber(reg)] |
| 165 | != kIllegalIndex; |
| 166 | } |
| 167 | |
| 168 | |
| 169 | void VirtualFrame::SetElementAt(int index, Handle<Object> value) { |
| 170 | Result temp(value); |
| 171 | SetElementAt(index, &temp); |
| 172 | } |
| 173 | |
| 174 | |
| 175 | Result VirtualFrame::CallStub(CodeStub* stub, int arg_count) { |
| 176 | PrepareForCall(arg_count, arg_count); |
| 177 | return RawCallStub(stub); |
| 178 | } |
| 179 | |
| 180 | |
| 181 | int VirtualFrame::parameter_count() { |
| 182 | return cgen()->scope()->num_parameters(); |
| 183 | } |
| 184 | |
| 185 | |
| 186 | int VirtualFrame::local_count() { |
| 187 | return cgen()->scope()->num_stack_slots(); |
| 188 | } |
| 189 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 190 | } } // namespace v8::internal |
| 191 | |
| 192 | #endif // V8_VIRTUAL_FRAME_HEAVY_INL_H_ |