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111 lines
3.4 KiB
C++
111 lines
3.4 KiB
C++
//===--- InProcessMemoryReader.h - Access to local memory -------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares an abstract interface for working with remote memory.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_REMOTE_INPROCESSMEMORYREADER_H
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#define SWIFT_REMOTE_INPROCESSMEMORYREADER_H
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#include "swift/Remote/MemoryReader.h"
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#include <cstring>
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#if defined(__APPLE__) && defined(__MACH__)
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#include <TargetConditionals.h>
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#endif
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namespace swift {
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namespace remote {
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/// An implementation of MemoryReader which simply reads from the current
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/// address space.
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class InProcessMemoryReader final : public MemoryReader {
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bool queryDataLayout(DataLayoutQueryType type, void *inBuffer,
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void *outBuffer) override {
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#if defined(__APPLE__) && __APPLE__
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auto applePlatform = true;
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#else
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auto applePlatform = false;
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#endif
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#if defined(__APPLE__) && __APPLE__ && ((defined(TARGET_OS_IOS) && TARGET_OS_IOS) || (defined(TARGET_OS_IOS) && TARGET_OS_WATCH) || (defined(TARGET_OS_TV) && TARGET_OS_TV) || defined(__arm64__))
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auto iosDerivedPlatform = true;
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#else
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auto iosDerivedPlatform = false;
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#endif
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switch (type) {
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case DLQ_GetPointerSize: {
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auto result = static_cast<uint8_t *>(outBuffer);
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*result = sizeof(void *);
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return true;
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}
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case DLQ_GetSizeSize: {
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auto result = static_cast<uint8_t *>(outBuffer);
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*result = sizeof(size_t);
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return true;
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}
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case DLQ_GetPtrAuthMask: {
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auto result = static_cast<uintptr_t *>(outBuffer);
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#if __has_feature(ptrauth_calls)
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*result = (uintptr_t)ptrauth_strip((void*)0x0007ffffffffffff, 0);
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#else
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*result = (uintptr_t)~0ull;
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#endif
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return true;
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}
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case DLQ_GetObjCReservedLowBits: {
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auto result = static_cast<uint8_t *>(outBuffer);
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if (applePlatform && !iosDerivedPlatform && (sizeof(void *) == 8)) {
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// Obj-C reserves low bit on 64-bit Intel macOS only.
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// Other Apple platforms don't reserve this bit (even when
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// running on x86_64-based simulators).
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*result = 1;
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} else {
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*result = 0;
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}
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return true;
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}
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case DLQ_GetLeastValidPointerValue: {
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auto result = static_cast<uint64_t *>(outBuffer);
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if (applePlatform && (sizeof(void *) == 8)) {
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// Swift reserves the first 4GiB on Apple 64-bit platforms
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*result = 0x100000000;
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return 1;
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} else {
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// Swift reserves the first 4KiB everywhere else
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*result = 0x1000;
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}
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return true;
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}
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}
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return false;
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}
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RemoteAddress getSymbolAddress(const std::string &name) override;
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bool readString(RemoteAddress address, std::string &dest) override {
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dest = address.getLocalPointer<char>();
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return true;
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}
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ReadBytesResult readBytes(RemoteAddress address, uint64_t size) override {
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return ReadBytesResult(address.getLocalPointer<void>(), [](const void *) {});
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}
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};
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}
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}
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#endif
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