Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/interpreter/bytecode-array-writer.h" |
| 6 | |
| 7 | #include <iomanip> |
| 8 | #include "src/interpreter/source-position-table.h" |
| 9 | |
| 10 | namespace v8 { |
| 11 | namespace internal { |
| 12 | namespace interpreter { |
| 13 | |
| 14 | BytecodeArrayWriter::BytecodeArrayWriter( |
| 15 | Zone* zone, SourcePositionTableBuilder* source_position_table_builder) |
| 16 | : bytecodes_(zone), |
| 17 | max_register_count_(0), |
| 18 | source_position_table_builder_(source_position_table_builder) {} |
| 19 | |
| 20 | // override |
| 21 | BytecodeArrayWriter::~BytecodeArrayWriter() {} |
| 22 | |
| 23 | // override |
| 24 | size_t BytecodeArrayWriter::FlushForOffset() { return bytecodes()->size(); } |
| 25 | |
| 26 | // override |
| 27 | void BytecodeArrayWriter::Write(BytecodeNode* node) { |
| 28 | UpdateSourcePositionTable(node); |
| 29 | EmitBytecode(node); |
| 30 | } |
| 31 | |
| 32 | void BytecodeArrayWriter::UpdateSourcePositionTable( |
| 33 | const BytecodeNode* const node) { |
| 34 | int bytecode_offset = static_cast<int>(bytecodes()->size()); |
| 35 | const BytecodeSourceInfo& source_info = node->source_info(); |
| 36 | if (source_info.is_valid()) { |
| 37 | source_position_table_builder_->AddPosition(bytecode_offset, |
| 38 | source_info.source_position(), |
| 39 | source_info.is_statement()); |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | void BytecodeArrayWriter::EmitBytecode(const BytecodeNode* const node) { |
| 44 | DCHECK_NE(node->bytecode(), Bytecode::kIllegal); |
| 45 | |
| 46 | OperandScale operand_scale = node->operand_scale(); |
| 47 | if (operand_scale != OperandScale::kSingle) { |
| 48 | Bytecode prefix = Bytecodes::OperandScaleToPrefixBytecode(operand_scale); |
| 49 | bytecodes()->push_back(Bytecodes::ToByte(prefix)); |
| 50 | } |
| 51 | |
| 52 | Bytecode bytecode = node->bytecode(); |
| 53 | bytecodes()->push_back(Bytecodes::ToByte(bytecode)); |
| 54 | |
| 55 | int register_operand_bitmap = Bytecodes::GetRegisterOperandBitmap(bytecode); |
| 56 | const uint32_t* const operands = node->operands(); |
| 57 | const OperandType* operand_types = Bytecodes::GetOperandTypes(bytecode); |
| 58 | for (int i = 0; operand_types[i] != OperandType::kNone; ++i) { |
| 59 | OperandType operand_type = operand_types[i]; |
| 60 | switch (Bytecodes::SizeOfOperand(operand_type, operand_scale)) { |
| 61 | case OperandSize::kNone: |
| 62 | UNREACHABLE(); |
| 63 | break; |
| 64 | case OperandSize::kByte: |
| 65 | bytecodes()->push_back(static_cast<uint8_t>(operands[i])); |
| 66 | break; |
| 67 | case OperandSize::kShort: { |
| 68 | uint8_t operand_bytes[2]; |
| 69 | WriteUnalignedUInt16(operand_bytes, operands[i]); |
| 70 | bytecodes()->insert(bytecodes()->end(), operand_bytes, |
| 71 | operand_bytes + 2); |
| 72 | break; |
| 73 | } |
| 74 | case OperandSize::kQuad: { |
| 75 | uint8_t operand_bytes[4]; |
| 76 | WriteUnalignedUInt32(operand_bytes, operands[i]); |
| 77 | bytecodes()->insert(bytecodes()->end(), operand_bytes, |
| 78 | operand_bytes + 4); |
| 79 | break; |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | if ((register_operand_bitmap >> i) & 1) { |
| 84 | int count; |
| 85 | if (operand_types[i + 1] == OperandType::kRegCount) { |
| 86 | count = static_cast<int>(operands[i + 1]); |
| 87 | } else { |
| 88 | count = Bytecodes::GetNumberOfRegistersRepresentedBy(operand_type); |
| 89 | } |
| 90 | Register reg = Register::FromOperand(static_cast<int32_t>(operands[i])); |
| 91 | max_register_count_ = std::max(max_register_count_, reg.index() + count); |
| 92 | } |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | // override |
| 97 | void BytecodeArrayWriter::FlushBasicBlock() {} |
| 98 | |
| 99 | int BytecodeArrayWriter::GetMaximumFrameSizeUsed() { |
| 100 | return max_register_count_ * kPointerSize; |
| 101 | } |
| 102 | |
| 103 | } // namespace interpreter |
| 104 | } // namespace internal |
| 105 | } // namespace v8 |