481f248e08
Get the shared cache filepath and uuid that the inferior process is using from debugserver, try to open that shared cache on the lldb host mac and if the UUID matches, index all of the binaries in that shared cache. When looking for binaries loaded in the process, get them from the already-indexed shared cache. Every time a binary is loaded, PlatformMacOSX may query the shared cache filepath and uuid from the Process, and pass that to HostInfo::GetSharedCacheImageInfo() if available (else fall back to the old HostInfo::GetSharedCacheImageInfo method which only looks at lldb's own shared cache), to get the file being requested. ProcessGDBRemote caches the shared cache filepath and uuid from the inferior, once it has a non-zero UUID. I added a lock for this ivar specifically, so I don't have 20 threads all asking for the shared cache information from debugserver and updating the cached answer. If we never get back a non-zero UUID shared cache reply, we will re-query at every library loaded notification. debugserver has been providing the shared cache UUID since 2013, although I only added the shared cache filepath field last November. Note that a process will not report its shared cache filepath or uuid at initial launch. As dyld gets a chance to execute a bit, it will start returning binaries -- it will be available at the point when libraries start loading. (it won't be available yet when the binary & dyld are the only two binaries loaded in the process) I tested this by disabling lldb's scan of its own shared cache pre-execution -- only loading the system shared cache when the inferior process reports that it is using that. I got 6-7 additional testsuite failures running lldb like that, because no system binaries were loaded before exeuction start, and the tests assumed they would be. rdar://148939795 --------- Co-authored-by: Jonas Devlieghere <jonas@devlieghere.com>
119 lines
4.2 KiB
C++
119 lines
4.2 KiB
C++
//===-- DynamicLoaderMacOS.h -------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// This is the DynamicLoader plugin for Darwin (macOS / iPhoneOS / tvOS /
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// watchOS / BridgeOS)
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// platforms late 2016 and newer, where lldb will call dyld SPI functions to get
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// information about shared libraries, information about the shared cache, and
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// the _dyld_debugger_notification function we put a breakpoint on give us an
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// array of load addresses for solibs loaded and unloaded. The SPI will tell us
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// about both dyld and the executable, in addition to all of the usual solibs.
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#ifndef LLDB_SOURCE_PLUGINS_DYNAMICLOADER_MACOSX_DYLD_DYNAMICLOADERMACOS_H
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#define LLDB_SOURCE_PLUGINS_DYNAMICLOADER_MACOSX_DYLD_DYNAMICLOADERMACOS_H
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#include <mutex>
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#include <vector>
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#include "lldb/Target/DynamicLoader.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/StructuredData.h"
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#include "lldb/Utility/UUID.h"
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#include "DynamicLoaderDarwin.h"
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class DynamicLoaderMacOS : public lldb_private::DynamicLoaderDarwin {
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public:
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DynamicLoaderMacOS(lldb_private::Process *process);
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~DynamicLoaderMacOS() override;
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// Static Functions
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static void Initialize();
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static void Terminate();
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static llvm::StringRef GetPluginNameStatic() { return "macos-dyld"; }
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static llvm::StringRef GetPluginDescriptionStatic();
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static lldb_private::DynamicLoader *
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CreateInstance(lldb_private::Process *process, bool force);
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/// Called after attaching a process.
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///
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/// Allow DynamicLoader plug-ins to execute some code after
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/// attaching to a process.
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bool ProcessDidExec() override;
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lldb_private::Status CanLoadImage() override;
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bool
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GetSharedCacheInformation(lldb::addr_t &base_address,
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lldb_private::UUID &uuid,
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lldb_private::LazyBool &using_shared_cache,
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lldb_private::LazyBool &private_shared_cache,
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lldb_private::FileSpec &shared_cache_path) override;
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// PluginInterface protocol
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llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
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protected:
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void PutToLog(lldb_private::Log *log) const;
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void DoInitialImageFetch() override;
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bool NeedToDoInitialImageFetch() override;
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bool DidSetNotificationBreakpoint() override;
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bool SetDYLDHandoverBreakpoint(lldb::addr_t notification_address);
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void ClearDYLDHandoverBreakpoint();
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void AddBinaries(const std::vector<lldb::addr_t> &load_addresses);
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void DoClear() override;
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bool IsFullyInitialized() override;
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static bool
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NotifyBreakpointHit(void *baton,
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lldb_private::StoppointCallbackContext *context,
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lldb::user_id_t break_id, lldb::user_id_t break_loc_id);
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lldb::addr_t GetNotificationFuncAddrFromImageInfos();
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bool SetNotificationBreakpoint() override;
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void ClearNotificationBreakpoint() override;
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void UpdateImageInfosHeaderAndLoadCommands(ImageInfo::collection &image_infos,
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uint32_t infos_count,
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bool update_executable);
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lldb::addr_t
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GetDyldLockVariableAddressFromModule(lldb_private::Module *module);
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uint32_t m_image_infos_stop_id; // The Stop ID the last time we
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// loaded/unloaded images
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lldb::user_id_t m_break_id;
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lldb::user_id_t m_dyld_handover_break_id;
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mutable std::recursive_mutex m_mutex;
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lldb::addr_t m_maybe_image_infos_address; // If dyld is still maintaining the
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// all_image_infos address, store it
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// here so we can use it to detect
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// exec's when talking to
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// debugservers that don't support
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// the "reason:exec" annotation.
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bool m_libsystem_fully_initalized;
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};
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#endif // LLDB_SOURCE_PLUGINS_DYNAMICLOADER_MACOSX_DYLD_DYNAMICLOADERMACOS_H
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