1 // Copyright 2016 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/handler-table-builder.h"
6
7 #include "src/heap/factory.h"
8 #include "src/interpreter/bytecode-register.h"
9 #include "src/isolate.h"
10 #include "src/objects-inl.h"
11
12 namespace v8 {
13 namespace internal {
14 namespace interpreter {
15
HandlerTableBuilder(Zone * zone)16 HandlerTableBuilder::HandlerTableBuilder(Zone* zone) : entries_(zone) {}
17
ToHandlerTable(Isolate * isolate)18 Handle<ByteArray> HandlerTableBuilder::ToHandlerTable(Isolate* isolate) {
19 int handler_table_size = static_cast<int>(entries_.size());
20 Handle<ByteArray> table_byte_array = isolate->factory()->NewByteArray(
21 HandlerTable::LengthForRange(handler_table_size), TENURED);
22 HandlerTable table(*table_byte_array);
23 for (int i = 0; i < handler_table_size; ++i) {
24 Entry& entry = entries_[i];
25 HandlerTable::CatchPrediction pred = entry.catch_prediction_;
26 table.SetRangeStart(i, static_cast<int>(entry.offset_start));
27 table.SetRangeEnd(i, static_cast<int>(entry.offset_end));
28 table.SetRangeHandler(i, static_cast<int>(entry.offset_target), pred);
29 table.SetRangeData(i, entry.context.index());
30 }
31 return table_byte_array;
32 }
33
34
NewHandlerEntry()35 int HandlerTableBuilder::NewHandlerEntry() {
36 int handler_id = static_cast<int>(entries_.size());
37 Entry entry = {0, 0, 0, Register::invalid_value(), HandlerTable::UNCAUGHT};
38 entries_.push_back(entry);
39 return handler_id;
40 }
41
42
SetTryRegionStart(int handler_id,size_t offset)43 void HandlerTableBuilder::SetTryRegionStart(int handler_id, size_t offset) {
44 DCHECK(Smi::IsValid(offset)); // Encoding of handler table requires this.
45 entries_[handler_id].offset_start = offset;
46 }
47
48
SetTryRegionEnd(int handler_id,size_t offset)49 void HandlerTableBuilder::SetTryRegionEnd(int handler_id, size_t offset) {
50 DCHECK(Smi::IsValid(offset)); // Encoding of handler table requires this.
51 entries_[handler_id].offset_end = offset;
52 }
53
54
SetHandlerTarget(int handler_id,size_t offset)55 void HandlerTableBuilder::SetHandlerTarget(int handler_id, size_t offset) {
56 DCHECK(Smi::IsValid(offset)); // Encoding of handler table requires this.
57 entries_[handler_id].offset_target = offset;
58 }
59
SetPrediction(int handler_id,HandlerTable::CatchPrediction prediction)60 void HandlerTableBuilder::SetPrediction(
61 int handler_id, HandlerTable::CatchPrediction prediction) {
62 entries_[handler_id].catch_prediction_ = prediction;
63 }
64
65
SetContextRegister(int handler_id,Register reg)66 void HandlerTableBuilder::SetContextRegister(int handler_id, Register reg) {
67 entries_[handler_id].context = reg;
68 }
69
70 } // namespace interpreter
71 } // namespace internal
72 } // namespace v8
73