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// Copyright 2019 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 "heap-constants.h"
#include "src/common/globals.h"
namespace d = v8::debug_helper;
namespace v8_debug_helper_internal {
std::string FindKnownObject(uintptr_t address, const d::Roots& roots) {
uintptr_t containing_page = address & ~i::kPageAlignmentMask;
uintptr_t offset_in_page = address & i::kPageAlignmentMask;
// If there's a match with a known root, then search only that page.
if (containing_page == roots.map_space) {
return FindKnownObjectInMapSpace(offset_in_page);
}
if (containing_page == roots.old_space) {
return FindKnownObjectInOldSpace(offset_in_page);
}
if (containing_page == roots.read_only_space) {
return FindKnownObjectInReadOnlySpace(offset_in_page);
}
// For any unknown roots, compile a list of things this object might be.
std::string result;
if (roots.map_space == 0) {
std::string sub_result = FindKnownObjectInMapSpace(offset_in_page);
if (!sub_result.empty()) {
result += "maybe " + sub_result;
}
}
if (roots.old_space == 0) {
std::string sub_result = FindKnownObjectInOldSpace(offset_in_page);
if (!sub_result.empty()) {
result = (result.empty() ? "" : result + ", ") + "maybe " + sub_result;
}
}
if (roots.read_only_space == 0) {
std::string sub_result = FindKnownObjectInReadOnlySpace(offset_in_page);
if (!sub_result.empty()) {
result = (result.empty() ? "" : result + ", ") + "maybe " + sub_result;
}
}
return result;
}
} // namespace v8_debug_helper_internal