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Issue 2226333002: [Interpreter] Avoid allocating handles in bytecode-array-writer (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@offheap_varchecks
Patch Set: [Interpreter] Avoid allocating handles in bytecode-array-writer Created 4 years, 4 months ago
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1 // Copyright 2015 the V8 project authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "src/interpreter/bytecode-array-writer.h" 5 #include "src/interpreter/bytecode-array-writer.h"
6 6
7 #include "src/api.h" 7 #include "src/api.h"
8 #include "src/interpreter/bytecode-label.h" 8 #include "src/interpreter/bytecode-label.h"
9 #include "src/interpreter/bytecode-register.h" 9 #include "src/interpreter/bytecode-register.h"
10 #include "src/interpreter/constant-array-builder.h" 10 #include "src/interpreter/constant-array-builder.h"
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247 Bytecode jump_bytecode = Bytecodes::FromByte(bytecodes()->at(jump_location)); 247 Bytecode jump_bytecode = Bytecodes::FromByte(bytecodes()->at(jump_location));
248 DCHECK(Bytecodes::IsJumpImmediate(jump_bytecode)); 248 DCHECK(Bytecodes::IsJumpImmediate(jump_bytecode));
249 size_t operand_location = jump_location + 1; 249 size_t operand_location = jump_location + 1;
250 DCHECK_EQ(bytecodes()->at(operand_location), k8BitJumpPlaceholder); 250 DCHECK_EQ(bytecodes()->at(operand_location), k8BitJumpPlaceholder);
251 if (Bytecodes::SizeForSignedOperand(delta) == OperandSize::kByte) { 251 if (Bytecodes::SizeForSignedOperand(delta) == OperandSize::kByte) {
252 // The jump fits within the range of an Imm operand, so cancel 252 // The jump fits within the range of an Imm operand, so cancel
253 // the reservation and jump directly. 253 // the reservation and jump directly.
254 constant_array_builder()->DiscardReservedEntry(OperandSize::kByte); 254 constant_array_builder()->DiscardReservedEntry(OperandSize::kByte);
255 bytecodes()->at(operand_location) = static_cast<uint8_t>(delta); 255 bytecodes()->at(operand_location) = static_cast<uint8_t>(delta);
256 } else { 256 } else {
257 // TODO(5203): Remove this temporary exception.
258 AllowHandleAllocation allow_handles;
259 // The jump does not fit within the range of an Imm operand, so 257 // The jump does not fit within the range of an Imm operand, so
260 // commit reservation putting the offset into the constant pool, 258 // commit reservation putting the offset into the constant pool,
261 // and update the jump instruction and operand. 259 // and update the jump instruction and operand.
262 size_t entry = constant_array_builder()->CommitReservedEntry( 260 size_t entry = constant_array_builder()->CommitReservedEntry(
263 OperandSize::kByte, handle(Smi::FromInt(delta), isolate())); 261 OperandSize::kByte, Smi::FromInt(delta));
264 DCHECK_LE(entry, kMaxUInt32); 262 DCHECK_LE(entry, kMaxUInt32);
265 DCHECK_EQ(Bytecodes::SizeForUnsignedOperand(static_cast<uint32_t>(entry)), 263 DCHECK_EQ(Bytecodes::SizeForUnsignedOperand(static_cast<uint32_t>(entry)),
266 OperandSize::kByte); 264 OperandSize::kByte);
267 jump_bytecode = GetJumpWithConstantOperand(jump_bytecode); 265 jump_bytecode = GetJumpWithConstantOperand(jump_bytecode);
268 bytecodes()->at(jump_location) = Bytecodes::ToByte(jump_bytecode); 266 bytecodes()->at(jump_location) = Bytecodes::ToByte(jump_bytecode);
269 bytecodes()->at(operand_location) = static_cast<uint8_t>(entry); 267 bytecodes()->at(operand_location) = static_cast<uint8_t>(entry);
270 } 268 }
271 } 269 }
272 270
273 void BytecodeArrayWriter::PatchJumpWith16BitOperand(size_t jump_location, 271 void BytecodeArrayWriter::PatchJumpWith16BitOperand(size_t jump_location,
274 int delta) { 272 int delta) {
275 Bytecode jump_bytecode = Bytecodes::FromByte(bytecodes()->at(jump_location)); 273 Bytecode jump_bytecode = Bytecodes::FromByte(bytecodes()->at(jump_location));
276 DCHECK(Bytecodes::IsJumpImmediate(jump_bytecode)); 274 DCHECK(Bytecodes::IsJumpImmediate(jump_bytecode));
277 size_t operand_location = jump_location + 1; 275 size_t operand_location = jump_location + 1;
278 uint8_t operand_bytes[2]; 276 uint8_t operand_bytes[2];
279 if (Bytecodes::SizeForSignedOperand(delta) <= OperandSize::kShort) { 277 if (Bytecodes::SizeForSignedOperand(delta) <= OperandSize::kShort) {
280 constant_array_builder()->DiscardReservedEntry(OperandSize::kShort); 278 constant_array_builder()->DiscardReservedEntry(OperandSize::kShort);
281 WriteUnalignedUInt16(operand_bytes, static_cast<uint16_t>(delta)); 279 WriteUnalignedUInt16(operand_bytes, static_cast<uint16_t>(delta));
282 } else { 280 } else {
283 // TODO(5203): Remove this temporary exception.
284 AllowHandleAllocation allow_handles;
285 jump_bytecode = GetJumpWithConstantOperand(jump_bytecode); 281 jump_bytecode = GetJumpWithConstantOperand(jump_bytecode);
286 bytecodes()->at(jump_location) = Bytecodes::ToByte(jump_bytecode); 282 bytecodes()->at(jump_location) = Bytecodes::ToByte(jump_bytecode);
287 size_t entry = constant_array_builder()->CommitReservedEntry( 283 size_t entry = constant_array_builder()->CommitReservedEntry(
288 OperandSize::kShort, handle(Smi::FromInt(delta), isolate())); 284 OperandSize::kShort, Smi::FromInt(delta));
289 WriteUnalignedUInt16(operand_bytes, static_cast<uint16_t>(entry)); 285 WriteUnalignedUInt16(operand_bytes, static_cast<uint16_t>(entry));
290 } 286 }
291 DCHECK(bytecodes()->at(operand_location) == k8BitJumpPlaceholder && 287 DCHECK(bytecodes()->at(operand_location) == k8BitJumpPlaceholder &&
292 bytecodes()->at(operand_location + 1) == k8BitJumpPlaceholder); 288 bytecodes()->at(operand_location + 1) == k8BitJumpPlaceholder);
293 bytecodes()->at(operand_location++) = operand_bytes[0]; 289 bytecodes()->at(operand_location++) = operand_bytes[0];
294 bytecodes()->at(operand_location) = operand_bytes[1]; 290 bytecodes()->at(operand_location) = operand_bytes[1];
295 } 291 }
296 292
297 void BytecodeArrayWriter::PatchJumpWith32BitOperand(size_t jump_location, 293 void BytecodeArrayWriter::PatchJumpWith32BitOperand(size_t jump_location,
298 int delta) { 294 int delta) {
(...skipping 89 matching lines...) Expand 10 before | Expand all | Expand 10 after
388 node->set_bytecode(node->bytecode(), k32BitJumpPlaceholder); 384 node->set_bytecode(node->bytecode(), k32BitJumpPlaceholder);
389 break; 385 break;
390 } 386 }
391 } 387 }
392 EmitBytecode(node); 388 EmitBytecode(node);
393 } 389 }
394 390
395 } // namespace interpreter 391 } // namespace interpreter
396 } // namespace internal 392 } // namespace internal
397 } // namespace v8 393 } // namespace v8
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