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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/factory.h"
8 #include "src/isolate.h"
9 #include "src/objects-inl.h"
10 
11 namespace v8 {
12 namespace internal {
13 namespace interpreter {
14 
HandlerTableBuilder(Isolate * isolate,Zone * zone)15 HandlerTableBuilder::HandlerTableBuilder(Isolate* isolate, Zone* zone)
16     : isolate_(isolate), entries_(zone) {}
17 
ToHandlerTable()18 Handle<HandlerTable> HandlerTableBuilder::ToHandlerTable() {
19   int handler_table_size = static_cast<int>(entries_.size());
20   Handle<HandlerTable> table =
21       Handle<HandlerTable>::cast(isolate_->factory()->NewFixedArray(
22           HandlerTable::LengthForRange(handler_table_size), TENURED));
23   for (int i = 0; i < handler_table_size; ++i) {
24     Entry& entry = entries_[i];
25     HandlerTable::CatchPrediction pred =
26         entry.will_catch ? HandlerTable::CAUGHT : HandlerTable::UNCAUGHT;
27     table->SetRangeStart(i, static_cast<int>(entry.offset_start));
28     table->SetRangeEnd(i, static_cast<int>(entry.offset_end));
29     table->SetRangeHandler(i, static_cast<int>(entry.offset_target), pred);
30     table->SetRangeData(i, entry.context.index());
31   }
32   return table;
33 }
34 
35 
NewHandlerEntry()36 int HandlerTableBuilder::NewHandlerEntry() {
37   int handler_id = static_cast<int>(entries_.size());
38   Entry entry = {0, 0, 0, Register(), false};
39   entries_.push_back(entry);
40   return handler_id;
41 }
42 
43 
SetTryRegionStart(int handler_id,size_t offset)44 void HandlerTableBuilder::SetTryRegionStart(int handler_id, size_t offset) {
45   DCHECK(Smi::IsValid(offset));  // Encoding of handler table requires this.
46   entries_[handler_id].offset_start = offset;
47 }
48 
49 
SetTryRegionEnd(int handler_id,size_t offset)50 void HandlerTableBuilder::SetTryRegionEnd(int handler_id, size_t offset) {
51   DCHECK(Smi::IsValid(offset));  // Encoding of handler table requires this.
52   entries_[handler_id].offset_end = offset;
53 }
54 
55 
SetHandlerTarget(int handler_id,size_t offset)56 void HandlerTableBuilder::SetHandlerTarget(int handler_id, size_t offset) {
57   DCHECK(Smi::IsValid(offset));  // Encoding of handler table requires this.
58   entries_[handler_id].offset_target = offset;
59 }
60 
61 
SetPrediction(int handler_id,bool will_catch)62 void HandlerTableBuilder::SetPrediction(int handler_id, bool will_catch) {
63   entries_[handler_id].will_catch = will_catch;
64 }
65 
66 
SetContextRegister(int handler_id,Register reg)67 void HandlerTableBuilder::SetContextRegister(int handler_id, Register reg) {
68   entries_[handler_id].context = reg;
69 }
70 
71 }  // namespace interpreter
72 }  // namespace internal
73 }  // namespace v8
74