Reland Implement .eh_frame writer and disassembler.

src/objects.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 42 matching lines @@
 #include "src/safepoint-table.h"
 #include "src/string-builder.h"
 #include "src/string-search.h"
 #include "src/string-stream.h"
 #include "src/utils.h"
 #include "src/zone.h"
 
 #ifdef ENABLE_DISASSEMBLER
 #include "src/disasm.h"
 #include "src/disassembler.h"
+#include "src/eh-frame.h"
 #endif
 
 namespace v8 {
 namespace internal {
 
 std::ostream& operator<<(std::ostream& os, InstanceType instance_type) {
   switch (instance_type) {
 #define WRITE_TYPE(TYPE) \
   case TYPE:             \
     return os << #TYPE;
@@ skipping 14275 matching lines @@
       HandlerTable::cast(handler_table())->HandlerTableReturnPrint(os);
     }
     os << "\n";
   }
 
   os << "RelocInfo (size = " << relocation_size() << ")\n";
   for (RelocIterator it(this); !it.done(); it.next()) {
     it.rinfo()->Print(GetIsolate(), os);
   }
   os << "\n";
+
+  if (has_unwinding_info()) {
+    os << "UnwindingInfo (size = " << unwinding_info_size() << ")\n";
+    EhFrameWriter::DisassembleToStream(os, unwinding_info_start(),
+                                       unwinding_info_end());
+    os << "\n";
+  }
 }
 #endif  // ENABLE_DISASSEMBLER
 
 int BytecodeArray::SourcePosition(int offset) {
   int last_position = 0;
   for (interpreter::SourcePositionTableIterator iterator(
            source_position_table());
        !iterator.done() && iterator.bytecode_offset() <= offset;
        iterator.Advance()) {
     last_position = iterator.source_position();
@@ skipping 4495 matching lines @@
   } else {
     // Old-style generators.
     int offset = continuation();
     CHECK(0 <= offset && offset < function()->code()->instruction_size());
     return function()->code()->SourcePosition(offset);
   }
 }
 
 }  // namespace internal
 }  // namespace v8