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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::HeapAddresses& heap_addresses) {
uintptr_t containing_page = address & ~i::kPageAlignmentMask;
uintptr_t offset_in_page = address & i::kPageAlignmentMask;
// If there's a match with a known page, then search only that page.
if (containing_page == heap_addresses.map_space_first_page) {
return FindKnownObjectInMapSpace(offset_in_page);
}
if (containing_page == heap_addresses.old_space_first_page) {
return FindKnownObjectInOldSpace(offset_in_page);
}
if (containing_page == heap_addresses.read_only_space_first_page) {
return FindKnownObjectInReadOnlySpace(offset_in_page);
}
// For any unknown pages, compile a list of things this object might be.
std::string result;
if (heap_addresses.map_space_first_page == 0) {
std::string sub_result = FindKnownObjectInMapSpace(offset_in_page);
if (!sub_result.empty()) {
result += "maybe " + sub_result;
}
}
if (heap_addresses.old_space_first_page == 0) {
std::string sub_result = FindKnownObjectInOldSpace(offset_in_page);
if (!sub_result.empty()) {
result = (result.empty() ? "" : result + ", ") + "maybe " + sub_result;
}
}
if (heap_addresses.read_only_space_first_page == 0) {
std::string sub_result = FindKnownObjectInReadOnlySpace(offset_in_page);
if (!sub_result.empty()) {
result = (result.empty() ? "" : result + ", ") + "maybe " + sub_result;
}
}
return result;
}
KnownInstanceType FindKnownMapInstanceTypes(
uintptr_t address, const d::HeapAddresses& heap_addresses) {
uintptr_t containing_page = address & ~i::kPageAlignmentMask;
uintptr_t offset_in_page = address & i::kPageAlignmentMask;
// If there's a match with a known page, then search only that page.
if (containing_page == heap_addresses.map_space_first_page) {
return KnownInstanceType(
FindKnownMapInstanceTypeInMapSpace(offset_in_page));
}
if (containing_page == heap_addresses.read_only_space_first_page) {
return KnownInstanceType(
FindKnownMapInstanceTypeInReadOnlySpace(offset_in_page));
}
// For any unknown pages, compile a list of things this object might be.
KnownInstanceType result;
if (heap_addresses.map_space_first_page == 0) {
int sub_result = FindKnownMapInstanceTypeInMapSpace(offset_in_page);
if (sub_result >= 0) {
result.types.push_back(static_cast<i::InstanceType>(sub_result));
}
}
if (heap_addresses.read_only_space_first_page == 0) {
int sub_result = FindKnownMapInstanceTypeInReadOnlySpace(offset_in_page);
if (sub_result >= 0) {
result.types.push_back(static_cast<i::InstanceType>(sub_result));
}
}
return result;
}
} // namespace v8_debug_helper_internal
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