Revert "Reapply "Use CodeSourceMap for stack traces (still JIT only).""

runtime/vm/zone_text_buffer.cc

-// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#include "vm/zone_text_buffer.h"
-
-#include "platform/assert.h"
-#include "platform/globals.h"
-#include "platform/utils.h"
-#include "vm/os.h"
-#include "vm/zone.h"
-
-namespace dart {
-
-ZoneTextBuffer::ZoneTextBuffer(Zone* zone, intptr_t initial_capacity)
-    : zone_(zone), buffer_(NULL), length_(0), capacity_(0) {
-  ASSERT(initial_capacity > 0);
-  buffer_ = reinterpret_cast<char*>(zone->Alloc<char>(initial_capacity));
-  capacity_ = initial_capacity;
-}
-
-
-intptr_t ZoneTextBuffer::Printf(const char* format, ...) {
-  va_list args;
-  va_start(args, format);
-  intptr_t remaining = capacity_ - length_;
-  ASSERT(remaining >= 0);
-  intptr_t len = OS::VSNPrint(buffer_ + length_, remaining, format, args);
-  va_end(args);
-  if (len >= remaining) {
-    EnsureCapacity(len);
-    remaining = capacity_ - length_;
-    ASSERT(remaining > len);
-    va_list args2;
-    va_start(args2, format);
-    intptr_t len2 = OS::VSNPrint(buffer_ + length_, remaining, format, args2);
-    va_end(args2);
-    ASSERT(len == len2);
-  }
-  length_ += len;
-  buffer_[length_] = '\0';
-  return len;
-}
-
-
-void ZoneTextBuffer::AddString(const char* s) {
-  Printf("%s", s);
-}
-
-
-void ZoneTextBuffer::EnsureCapacity(intptr_t len) {
-  intptr_t remaining = capacity_ - length_;
-  if (remaining <= len) {
-    const int kBufferSpareCapacity = 64;  // Somewhat arbitrary.
-    // TODO(turnidge): do we need to guard against overflow or other
-    // security issues here? Text buffers are used by the debugger
-    // to send user-controlled data (e.g. values of string variables) to
-    // the debugger front-end.
-    intptr_t new_capacity = capacity_ + len + kBufferSpareCapacity;
-    buffer_ = zone_->Realloc<char>(buffer_, capacity_, new_capacity);
-    capacity_ = new_capacity;
-  }
-}
-
-}  // namespace dart