diff --git a/lldb/bindings/headers.swig b/lldb/bindings/headers.swig index f7871765624dd..d392ed43d8c0c 100644 --- a/lldb/bindings/headers.swig +++ b/lldb/bindings/headers.swig @@ -77,4 +77,5 @@ #include "lldb/API/SBValueList.h" #include "lldb/API/SBVariablesOptions.h" #include "lldb/API/SBWatchpoint.h" +#include "lldb/API/SBWatchpointOptions.h" %} diff --git a/lldb/bindings/interface/SBWatchpointOptionsDocstrings.i b/lldb/bindings/interface/SBWatchpointOptionsDocstrings.i new file mode 100644 index 0000000000000..370bf95401dcb --- /dev/null +++ b/lldb/bindings/interface/SBWatchpointOptionsDocstrings.i @@ -0,0 +1,12 @@ +%feature("docstring", +"A container for options to use when creating watchpoints." +) lldb::SBWatchpointOptions; + +%feature("docstring", "Sets whether the watchpoint should stop on read accesses." +) lldb::SBWatchpointOptions::SetWatchpointTypeRead; +%feature("docstring", "Gets whether the watchpoint should stop on read accesses." +) lldb::SBWatchpointOptions::GetWatchpointTypeRead; +%feature("docstring", "Sets whether the watchpoint should stop on write accesses. eWatchpointWriteTypeOnModify is the most commonly useful mode, where lldb will stop when the watched value has changed. eWatchpointWriteTypeAlways will stop on any write to the watched region, even if it's the value is the same." +) lldb::SBWatchpointOptions::SetWatchpointTypeWrite; +%feature("docstring", "Gets whether the watchpoint should stop on write accesses, returning WatchpointWriteType to indicate the type of write watching that is enabled, or eWatchpointWriteTypeDisabled." +) lldb::SBWatchpointOptions::GetWatchpointTypeWrite; diff --git a/lldb/bindings/interfaces.swig b/lldb/bindings/interfaces.swig index 53f8fcc8145ac..306cfe6838932 100644 --- a/lldb/bindings/interfaces.swig +++ b/lldb/bindings/interfaces.swig @@ -80,6 +80,7 @@ %include "./interface/SBValueListDocstrings.i" %include "./interface/SBVariablesOptionsDocstrings.i" %include "./interface/SBWatchpointDocstrings.i" +%include "./interface/SBWatchpointOptionsDocstrings.i" /* API headers */ %include "lldb/API/SBAddress.h" @@ -152,6 +153,7 @@ %include "lldb/API/SBValueList.h" %include "lldb/API/SBVariablesOptions.h" %include "lldb/API/SBWatchpoint.h" +%include "lldb/API/SBWatchpointOptions.h" /* Extensions for SB classes */ %include "./interface/SBAddressExtensions.i" diff --git a/lldb/include/lldb/API/SBTarget.h b/lldb/include/lldb/API/SBTarget.h index 07bd6a8b76d2f..83087623088c5 100644 --- a/lldb/include/lldb/API/SBTarget.h +++ b/lldb/include/lldb/API/SBTarget.h @@ -21,6 +21,7 @@ #include "lldb/API/SBType.h" #include "lldb/API/SBValue.h" #include "lldb/API/SBWatchpoint.h" +#include "lldb/API/SBWatchpointOptions.h" namespace lldb_private { namespace python { @@ -828,8 +829,13 @@ class LLDB_API SBTarget { lldb::SBWatchpoint FindWatchpointByID(lldb::watch_id_t watch_id); + LLDB_DEPRECATED("WatchAddress deprecated, use WatchpointCreateByAddress") lldb::SBWatchpoint WatchAddress(lldb::addr_t addr, size_t size, bool read, - bool write, SBError &error); + bool modify, SBError &error); + + lldb::SBWatchpoint + WatchpointCreateByAddress(lldb::addr_t addr, size_t size, + lldb::SBWatchpointOptions options, SBError &error); bool EnableAllWatchpoints(); diff --git a/lldb/include/lldb/API/SBWatchpointOptions.h b/lldb/include/lldb/API/SBWatchpointOptions.h new file mode 100644 index 0000000000000..5d1d6ab9e09ff --- /dev/null +++ b/lldb/include/lldb/API/SBWatchpointOptions.h @@ -0,0 +1,43 @@ +//===-- SBWatchpointOptions.h -----------------------------------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef LLDB_API_SBWATCHPOINTOPTIONS_H +#define LLDB_API_SBWATCHPOINTOPTIONS_H + +#include "lldb/API/SBDefines.h" + +class WatchpointOptionsImpl; + +namespace lldb { + +class LLDB_API SBWatchpointOptions { +public: + SBWatchpointOptions(); + + SBWatchpointOptions(const lldb::SBWatchpointOptions &rhs); + + ~SBWatchpointOptions(); + + const SBWatchpointOptions &operator=(const lldb::SBWatchpointOptions &rhs); + + /// Stop when the watched memory region is read. + void SetWatchpointTypeRead(bool read); + bool GetWatchpointTypeRead() const; + + /// Stop when the watched memory region is written to/modified + void SetWatchpointTypeWrite(lldb::WatchpointWriteType write_type); + lldb::WatchpointWriteType GetWatchpointTypeWrite() const; + +private: + // This auto_pointer is made in the constructor and is always valid. + mutable std::unique_ptr m_opaque_up; +}; + +} // namespace lldb + +#endif // LLDB_API_SBWATCHPOINTOPTIONS_H diff --git a/lldb/include/lldb/Breakpoint/Watchpoint.h b/lldb/include/lldb/Breakpoint/Watchpoint.h index 8fde3b563a3f0..c86d66663c7f8 100644 --- a/lldb/include/lldb/Breakpoint/Watchpoint.h +++ b/lldb/include/lldb/Breakpoint/Watchpoint.h @@ -76,12 +76,14 @@ class Watchpoint : public std::enable_shared_from_this, bool WatchpointRead() const; bool WatchpointWrite() const; + bool WatchpointModify() const; uint32_t GetIgnoreCount() const; void SetIgnoreCount(uint32_t n); void SetWatchpointType(uint32_t type, bool notify = true); void SetDeclInfo(const std::string &str); std::string GetWatchSpec(); void SetWatchSpec(const std::string &str); + bool WatchedValueReportable(const ExecutionContext &exe_ctx); // Snapshot management interface. bool IsWatchVariable() const; @@ -212,7 +214,8 @@ class Watchpoint : public std::enable_shared_from_this, // again, we check the count, if it is more than 1, it means the user- // supplied actions actually want the watchpoint to be disabled! uint32_t m_watch_read : 1, // 1 if we stop when the watched data is read from - m_watch_write : 1; // 1 if we stop when the watched data is written to + m_watch_write : 1, // 1 if we stop when the watched data is written to + m_watch_modify : 1; // 1 if we stop when the watched data is changed uint32_t m_ignore_count; // Number of times to ignore this watchpoint std::string m_decl_str; // Declaration information, if any. std::string m_watch_spec_str; // Spec for the watchpoint. diff --git a/lldb/include/lldb/Interpreter/OptionGroupWatchpoint.h b/lldb/include/lldb/Interpreter/OptionGroupWatchpoint.h index 201ab1d134f25..f009fa145f303 100644 --- a/lldb/include/lldb/Interpreter/OptionGroupWatchpoint.h +++ b/lldb/include/lldb/Interpreter/OptionGroupWatchpoint.h @@ -30,13 +30,15 @@ class OptionGroupWatchpoint : public OptionGroup { void OptionParsingStarting(ExecutionContext *execution_context) override; - // Note: - // eWatchRead == LLDB_WATCH_TYPE_READ; and - // eWatchWrite == LLDB_WATCH_TYPE_WRITE + /// eWatchRead == LLDB_WATCH_TYPE_READ + /// eWatchWrite == LLDB_WATCH_TYPE_WRITE + /// eWatchModify == LLDB_WATCH_TYPE_MODIFY + /// eWatchReadWrite == LLDB_WATCH_TYPE_READ | LLDB_WATCH_TYPE_WRITE enum WatchType { eWatchInvalid = 0, eWatchRead, eWatchWrite, + eWatchModify, eWatchReadWrite }; diff --git a/lldb/include/lldb/lldb-defines.h b/lldb/include/lldb/lldb-defines.h index 5e43f55224f52..ce7fd6f375451 100644 --- a/lldb/include/lldb/lldb-defines.h +++ b/lldb/include/lldb/lldb-defines.h @@ -44,8 +44,10 @@ #define LLDB_WATCH_ID_IS_VALID(uid) ((uid) != (LLDB_INVALID_WATCH_ID)) #define LLDB_WATCH_TYPE_READ (1u << 0) #define LLDB_WATCH_TYPE_WRITE (1u << 1) +#define LLDB_WATCH_TYPE_MODIFY (1u << 2) #define LLDB_WATCH_TYPE_IS_VALID(type) \ - ((type & LLDB_WATCH_TYPE_READ) || (type & LLDB_WATCH_TYPE_WRITE)) + ((type & LLDB_WATCH_TYPE_READ) || (type & LLDB_WATCH_TYPE_WRITE) || \ + (type & LLDB_WATCH_TYPE_MODIFY)) // Generic Register Numbers #define LLDB_REGNUM_GENERIC_PC 0 // Program Counter diff --git a/lldb/include/lldb/lldb-enumerations.h b/lldb/include/lldb/lldb-enumerations.h index 21e098481ce80..36f3030c5226d 100644 --- a/lldb/include/lldb/lldb-enumerations.h +++ b/lldb/include/lldb/lldb-enumerations.h @@ -431,6 +431,21 @@ FLAGS_ENUM(WatchpointEventType){ eWatchpointEventTypeThreadChanged = (1u << 11), eWatchpointEventTypeTypeChanged = (1u << 12)}; +enum WatchpointWriteType { + /// Don't stop when the watched memory region is written to. + eWatchpointWriteTypeDisabled, + /// Stop on any write access to the memory region, even if + /// the value doesn't change. On some architectures, a write + /// near the memory region may be falsely reported as a match, + /// and notify this spurious stop as a watchpoint trap. + eWatchpointWriteTypeAlways, + /// Stop on a write to the memory region that changes its value. + /// This is most likely the behavior a user expects, and is the + /// behavior in gdb. lldb can silently ignore writes near the + /// watched memory region that are reported as accesses to lldb. + eWatchpointWriteTypeOnModify +}; + /// Programming language type. /// /// These enumerations use the same language enumerations as the DWARF diff --git a/lldb/include/lldb/lldb-forward.h b/lldb/include/lldb/lldb-forward.h index c159d82911a04..3cd71c8a4ba3c 100644 --- a/lldb/include/lldb/lldb-forward.h +++ b/lldb/include/lldb/lldb-forward.h @@ -284,6 +284,7 @@ class VariableList; class Watchpoint; class WatchpointList; class WatchpointOptions; +class WatchpointSetOptions; struct CompilerContext; struct LineEntry; struct PropertyDefinition; diff --git a/lldb/source/API/CMakeLists.txt b/lldb/source/API/CMakeLists.txt index 39ac451c471c5..910cb667e16b7 100644 --- a/lldb/source/API/CMakeLists.txt +++ b/lldb/source/API/CMakeLists.txt @@ -91,6 +91,7 @@ add_lldb_library(liblldb SHARED ${option_framework} SBValueList.cpp SBVariablesOptions.cpp SBWatchpoint.cpp + SBWatchpointOptions.cpp SBUnixSignals.cpp SystemInitializerFull.cpp ${lldb_python_wrapper} diff --git a/lldb/source/API/SBTarget.cpp b/lldb/source/API/SBTarget.cpp index e38edf8e44652..a4a7ac338c207 100644 --- a/lldb/source/API/SBTarget.cpp +++ b/lldb/source/API/SBTarget.cpp @@ -1322,27 +1322,39 @@ SBWatchpoint SBTarget::FindWatchpointByID(lldb::watch_id_t wp_id) { } lldb::SBWatchpoint SBTarget::WatchAddress(lldb::addr_t addr, size_t size, - bool read, bool write, + bool read, bool modify, SBError &error) { LLDB_INSTRUMENT_VA(this, addr, size, read, write, error); + SBWatchpointOptions options; + options.SetWatchpointTypeRead(read); + options.SetWatchpointTypeWrite(eWatchpointWriteTypeOnModify); + return WatchpointCreateByAddress(addr, size, options, error); +} + +lldb::SBWatchpoint +SBTarget::WatchpointCreateByAddress(lldb::addr_t addr, size_t size, + SBWatchpointOptions options, + SBError &error) { + LLDB_INSTRUMENT_VA(this, addr, size, options, error); + SBWatchpoint sb_watchpoint; lldb::WatchpointSP watchpoint_sp; TargetSP target_sp(GetSP()); - if (target_sp && (read || write) && addr != LLDB_INVALID_ADDRESS && - size > 0) { + uint32_t watch_type = 0; + if (options.GetWatchpointTypeRead()) + watch_type |= LLDB_WATCH_TYPE_READ; + if (options.GetWatchpointTypeWrite() == eWatchpointWriteTypeAlways) + watch_type |= LLDB_WATCH_TYPE_WRITE; + if (options.GetWatchpointTypeWrite() == eWatchpointWriteTypeOnModify) + watch_type |= LLDB_WATCH_TYPE_MODIFY; + if (watch_type == 0) { + error.SetErrorString("Can't create a watchpoint that is neither read nor " + "write nor modify."); + return sb_watchpoint; + } + if (target_sp && addr != LLDB_INVALID_ADDRESS && size > 0) { std::lock_guard guard(target_sp->GetAPIMutex()); - uint32_t watch_type = 0; - if (read) - watch_type |= LLDB_WATCH_TYPE_READ; - if (write) - watch_type |= LLDB_WATCH_TYPE_WRITE; - if (watch_type == 0) { - error.SetErrorString( - "Can't create a watchpoint that is neither read nor write."); - return sb_watchpoint; - } - // Target::CreateWatchpoint() is thread safe. Status cw_error; // This API doesn't take in a type, so we can't figure out what it is. diff --git a/lldb/source/API/SBValue.cpp b/lldb/source/API/SBValue.cpp index 738773c93c49b..e14f1196c6316 100644 --- a/lldb/source/API/SBValue.cpp +++ b/lldb/source/API/SBValue.cpp @@ -1433,10 +1433,17 @@ lldb::SBWatchpoint SBValue::Watch(bool resolve_location, bool read, bool write, return sb_watchpoint; uint32_t watch_type = 0; - if (read) + if (read) { watch_type |= LLDB_WATCH_TYPE_READ; - if (write) - watch_type |= LLDB_WATCH_TYPE_WRITE; + // read + write, the most likely intention + // is to catch all writes to this, not just + // value modifications. + if (write) + watch_type |= LLDB_WATCH_TYPE_WRITE; + } else { + if (write) + watch_type |= LLDB_WATCH_TYPE_MODIFY; + } Status rc; CompilerType type(value_sp->GetCompilerType()); diff --git a/lldb/source/API/SBWatchpoint.cpp b/lldb/source/API/SBWatchpoint.cpp index 6a63e65956bc4..8b4e0ad3178b1 100644 --- a/lldb/source/API/SBWatchpoint.cpp +++ b/lldb/source/API/SBWatchpoint.cpp @@ -354,7 +354,8 @@ bool SBWatchpoint::IsWatchingWrites() { std::lock_guard guard( watchpoint_sp->GetTarget().GetAPIMutex()); - return watchpoint_sp->WatchpointWrite(); + return watchpoint_sp->WatchpointWrite() || + watchpoint_sp->WatchpointModify(); } return false; diff --git a/lldb/source/API/SBWatchpointOptions.cpp b/lldb/source/API/SBWatchpointOptions.cpp new file mode 100644 index 0000000000000..62e9c21a85795 --- /dev/null +++ b/lldb/source/API/SBWatchpointOptions.cpp @@ -0,0 +1,73 @@ +//===-- SBWatchpointOptions.cpp -------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "lldb/API/SBWatchpointOptions.h" +#include "lldb/Breakpoint/Watchpoint.h" +#include "lldb/Utility/Instrumentation.h" + +#include "Utils.h" + +using namespace lldb; +using namespace lldb_private; + +class WatchpointOptionsImpl { +public: + bool m_read = false; + bool m_write = false; + bool m_modify = false; +}; + + +SBWatchpointOptions::SBWatchpointOptions() + : m_opaque_up(new WatchpointOptionsImpl()) { + LLDB_INSTRUMENT_VA(this); +} + +SBWatchpointOptions::SBWatchpointOptions(const SBWatchpointOptions &rhs) { + LLDB_INSTRUMENT_VA(this, rhs); + + m_opaque_up = clone(rhs.m_opaque_up); +} + +const SBWatchpointOptions & +SBWatchpointOptions::operator=(const SBWatchpointOptions &rhs) { + LLDB_INSTRUMENT_VA(this, rhs); + + if (this != &rhs) + m_opaque_up = clone(rhs.m_opaque_up); + return *this; +} + +SBWatchpointOptions::~SBWatchpointOptions() = default; + +void SBWatchpointOptions::SetWatchpointTypeRead(bool read) { + m_opaque_up->m_read = read; +} +bool SBWatchpointOptions::GetWatchpointTypeRead() const { + return m_opaque_up->m_read; +} + +void SBWatchpointOptions::SetWatchpointTypeWrite( + WatchpointWriteType write_type) { + if (write_type == eWatchpointWriteTypeOnModify) { + m_opaque_up->m_write = false; + m_opaque_up->m_modify = true; + } else if (write_type == eWatchpointWriteTypeAlways) { + m_opaque_up->m_write = true; + m_opaque_up->m_modify = false; + } else + m_opaque_up->m_write = m_opaque_up->m_modify = false; +} + +WatchpointWriteType SBWatchpointOptions::GetWatchpointTypeWrite() const { + if (m_opaque_up->m_modify) + return eWatchpointWriteTypeOnModify; + if (m_opaque_up->m_write) + return eWatchpointWriteTypeAlways; + return eWatchpointWriteTypeDisabled; +} diff --git a/lldb/source/Breakpoint/Watchpoint.cpp b/lldb/source/Breakpoint/Watchpoint.cpp index f88e899eb711f..14144214faea7 100644 --- a/lldb/source/Breakpoint/Watchpoint.cpp +++ b/lldb/source/Breakpoint/Watchpoint.cpp @@ -29,7 +29,8 @@ Watchpoint::Watchpoint(Target &target, lldb::addr_t addr, uint32_t size, : StoppointSite(0, addr, size, hardware), m_target(target), m_enabled(false), m_is_hardware(hardware), m_is_watch_variable(false), m_is_ephemeral(false), m_disabled_count(0), m_watch_read(0), - m_watch_write(0), m_ignore_count(0), m_being_created(true) { + m_watch_write(0), m_watch_modify(0), m_ignore_count(0), + m_being_created(true) { if (type && type->IsValid()) m_type = *type; @@ -193,7 +194,7 @@ bool Watchpoint::IsWatchVariable() const { return m_is_watch_variable; } void Watchpoint::SetWatchVariable(bool val) { m_is_watch_variable = val; } bool Watchpoint::CaptureWatchedValue(const ExecutionContext &exe_ctx) { - ConstString watch_name("$__lldb__watch_value"); + ConstString g_watch_name("$__lldb__watch_value"); m_old_value_sp = m_new_value_sp; Address watch_address(GetLoadAddress()); if (!m_type.IsValid()) { @@ -205,12 +206,47 @@ bool Watchpoint::CaptureWatchedValue(const ExecutionContext &exe_ctx) { return false; } m_new_value_sp = ValueObjectMemory::Create( - exe_ctx.GetBestExecutionContextScope(), watch_name.GetStringRef(), + exe_ctx.GetBestExecutionContextScope(), g_watch_name.GetStringRef(), watch_address, m_type); - m_new_value_sp = m_new_value_sp->CreateConstantValue(watch_name); + m_new_value_sp = m_new_value_sp->CreateConstantValue(g_watch_name); return (m_new_value_sp && m_new_value_sp->GetError().Success()); } +bool Watchpoint::WatchedValueReportable(const ExecutionContext &exe_ctx) { + if (!m_watch_modify || m_watch_read) + return true; + if (!m_type.IsValid()) + return true; + + ConstString g_watch_name("$__lldb__watch_value"); + Address watch_address(GetLoadAddress()); + ValueObjectSP newest_valueobj_sp = ValueObjectMemory::Create( + exe_ctx.GetBestExecutionContextScope(), g_watch_name.GetStringRef(), + watch_address, m_type); + newest_valueobj_sp = newest_valueobj_sp->CreateConstantValue(g_watch_name); + Status error; + + DataExtractor new_data; + DataExtractor old_data; + + newest_valueobj_sp->GetData(new_data, error); + if (error.Fail()) + return true; + m_new_value_sp->GetData(old_data, error); + if (error.Fail()) + return true; + + if (new_data.GetByteSize() != old_data.GetByteSize() || + new_data.GetByteSize() == 0) + return true; + + if (memcmp(new_data.GetDataStart(), old_data.GetDataStart(), + old_data.GetByteSize()) == 0) + return false; // Value has not changed, user requested modify watchpoint + + return true; +} + // RETURNS - true if we should stop at this breakpoint, false if we // should continue. @@ -268,10 +304,10 @@ void Watchpoint::DumpWithLevel(Stream *s, description_level <= lldb::eDescriptionLevelVerbose); s->Printf("Watchpoint %u: addr = 0x%8.8" PRIx64 - " size = %u state = %s type = %s%s", + " size = %u state = %s type = %s%s%s", GetID(), GetLoadAddress(), m_byte_size, IsEnabled() ? "enabled" : "disabled", m_watch_read ? "r" : "", - m_watch_write ? "w" : ""); + m_watch_write ? "w" : "", m_watch_modify ? "m" : ""); if (description_level >= lldb::eDescriptionLevelFull) { if (!m_decl_str.empty()) @@ -333,10 +369,13 @@ void Watchpoint::SetEnabled(bool enabled, bool notify) { void Watchpoint::SetWatchpointType(uint32_t type, bool notify) { int old_watch_read = m_watch_read; int old_watch_write = m_watch_write; + int old_watch_modify = m_watch_modify; m_watch_read = (type & LLDB_WATCH_TYPE_READ) != 0; m_watch_write = (type & LLDB_WATCH_TYPE_WRITE) != 0; + m_watch_modify = (type & LLDB_WATCH_TYPE_MODIFY) != 0; if (notify && - (old_watch_read != m_watch_read || old_watch_write != m_watch_write)) + (old_watch_read != m_watch_read || old_watch_write != m_watch_write || + old_watch_modify != m_watch_modify)) SendWatchpointChangedEvent(eWatchpointEventTypeTypeChanged); } @@ -344,6 +383,8 @@ bool Watchpoint::WatchpointRead() const { return m_watch_read != 0; } bool Watchpoint::WatchpointWrite() const { return m_watch_write != 0; } +bool Watchpoint::WatchpointModify() const { return m_watch_modify != 0; } + uint32_t Watchpoint::GetIgnoreCount() const { return m_ignore_count; } void Watchpoint::SetIgnoreCount(uint32_t n) { diff --git a/lldb/source/Commands/CommandObjectWatchpoint.cpp b/lldb/source/Commands/CommandObjectWatchpoint.cpp index a4929ea0d5159..83c2fb824bb9d 100644 --- a/lldb/source/Commands/CommandObjectWatchpoint.cpp +++ b/lldb/source/Commands/CommandObjectWatchpoint.cpp @@ -803,7 +803,7 @@ class CommandObjectWatchpointSetVariable : public CommandObjectParsed { "Set a watchpoint on a variable. " "Use the '-w' option to specify the type of watchpoint and " "the '-s' option to specify the byte size to watch for. " - "If no '-w' option is specified, it defaults to write. " + "If no '-w' option is specified, it defaults to modify. " "If no '-s' option is specified, it defaults to the variable's " "byte size. " "Note that there are limited hardware resources for watchpoints. " @@ -878,9 +878,9 @@ corresponding to the byte size of the data type."); return false; } - // If no '-w' is specified, default to '-w write'. + // If no '-w' is specified, default to '-w modify'. if (!m_option_watchpoint.watch_type_specified) { - m_option_watchpoint.watch_type = OptionGroupWatchpoint::eWatchWrite; + m_option_watchpoint.watch_type = OptionGroupWatchpoint::eWatchModify; } // We passed the sanity check for the command. Proceed to set the @@ -947,7 +947,23 @@ corresponding to the byte size of the data type."); } // Now it's time to create the watchpoint. - uint32_t watch_type = m_option_watchpoint.watch_type; + uint32_t watch_type = 0; + switch (m_option_watchpoint.watch_type) { + case OptionGroupWatchpoint::eWatchModify: + watch_type |= LLDB_WATCH_TYPE_MODIFY; + break; + case OptionGroupWatchpoint::eWatchRead: + watch_type |= LLDB_WATCH_TYPE_READ; + break; + case OptionGroupWatchpoint::eWatchReadWrite: + watch_type |= LLDB_WATCH_TYPE_READ | LLDB_WATCH_TYPE_WRITE; + break; + case OptionGroupWatchpoint::eWatchWrite: + watch_type |= LLDB_WATCH_TYPE_WRITE; + break; + case OptionGroupWatchpoint::eWatchInvalid: + break; + }; error.Clear(); WatchpointSP watch_sp = @@ -999,7 +1015,7 @@ class CommandObjectWatchpointSetExpression : public CommandObjectRaw { "Use the '-l' option to specify the language of the expression. " "Use the '-w' option to specify the type of watchpoint and " "the '-s' option to specify the byte size to watch for. " - "If no '-w' option is specified, it defaults to write. " + "If no '-w' option is specified, it defaults to modify. " "If no '-s' option is specified, it defaults to the target's " "pointer byte size. " "Note that there are limited hardware resources for watchpoints. " @@ -1013,7 +1029,7 @@ class CommandObjectWatchpointSetExpression : public CommandObjectRaw { R"( Examples: -(lldb) watchpoint set expression -w write -s 1 -- foo + 32 +(lldb) watchpoint set expression -w modify -s 1 -- foo + 32 Watches write access for the 1-byte region pointed to by the address 'foo + 32')"); @@ -1073,7 +1089,7 @@ class CommandObjectWatchpointSetExpression : public CommandObjectRaw { // If no '-w' is specified, default to '-w write'. if (!m_option_watchpoint.watch_type_specified) { - m_option_watchpoint.watch_type = OptionGroupWatchpoint::eWatchWrite; + m_option_watchpoint.watch_type = OptionGroupWatchpoint::eWatchModify; } // We passed the sanity check for the command. Proceed to set the diff --git a/lldb/source/Interpreter/OptionGroupWatchpoint.cpp b/lldb/source/Interpreter/OptionGroupWatchpoint.cpp index c2f78d8c2dd14..c3708e7a1e80f 100644 --- a/lldb/source/Interpreter/OptionGroupWatchpoint.cpp +++ b/lldb/source/Interpreter/OptionGroupWatchpoint.cpp @@ -27,6 +27,11 @@ static constexpr OptionEnumValueElement g_watch_type[] = { "write", "Watch for write", }, + { + OptionGroupWatchpoint::eWatchModify, + "modify", + "Watch for modifications", + }, { OptionGroupWatchpoint::eWatchReadWrite, "read_write", diff --git a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp index 2fc446b1dd7ab..9d4e0a9a90dad 100644 --- a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp +++ b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp @@ -3108,14 +3108,16 @@ static GDBStoppointType GetGDBStoppointType(Watchpoint *wp) { assert(wp); bool watch_read = wp->WatchpointRead(); bool watch_write = wp->WatchpointWrite(); + bool watch_modify = wp->WatchpointModify(); - // watch_read and watch_write cannot both be false. - assert(watch_read || watch_write); - if (watch_read && watch_write) + // watch_read, watch_write, watch_modify cannot all be false. + assert((watch_read || watch_write || watch_modify) && + "watch_read, watch_write, watch_modify cannot all be false."); + if (watch_read && (watch_write || watch_modify)) return eWatchpointReadWrite; else if (watch_read) return eWatchpointRead; - else // Must be watch_write, then. + else // Must be watch_write or watch_modify, then. return eWatchpointWrite; } diff --git a/lldb/source/Target/StopInfo.cpp b/lldb/source/Target/StopInfo.cpp index ff3d8f68833c8..a189f4be1926a 100644 --- a/lldb/source/Target/StopInfo.cpp +++ b/lldb/source/Target/StopInfo.cpp @@ -982,6 +982,12 @@ class StopInfoWatchpoint : public StopInfo { m_should_stop = false; } } + + // Don't stop if the watched region value is unmodified, and + // this is a Modify-type watchpoint. + if (m_should_stop && !wp_sp->WatchedValueReportable(exe_ctx)) + m_should_stop = false; + // Finally, if we are going to stop, print out the new & old values: if (m_should_stop) { wp_sp->CaptureWatchedValue(exe_ctx); diff --git a/lldb/source/Target/Target.cpp b/lldb/source/Target/Target.cpp index 8de4fd033ec87..f197b1b1aa097 100644 --- a/lldb/source/Target/Target.cpp +++ b/lldb/source/Target/Target.cpp @@ -860,7 +860,8 @@ WatchpointSP Target::CreateWatchpoint(lldb::addr_t addr, size_t size, size_t old_size = matched_sp->GetByteSize(); uint32_t old_type = (matched_sp->WatchpointRead() ? LLDB_WATCH_TYPE_READ : 0) | - (matched_sp->WatchpointWrite() ? LLDB_WATCH_TYPE_WRITE : 0); + (matched_sp->WatchpointWrite() ? LLDB_WATCH_TYPE_WRITE : 0) | + (matched_sp->WatchpointModify() ? LLDB_WATCH_TYPE_MODIFY : 0); // Return the existing watchpoint if both size and type match. if (size == old_size && kind == old_type) { wp_sp = matched_sp; diff --git a/lldb/test/API/commands/watchpoints/multiple_hits/main.cpp b/lldb/test/API/commands/watchpoints/multiple_hits/main.cpp index c8ce8a0188691..f3596f21fa213 100644 --- a/lldb/test/API/commands/watchpoints/multiple_hits/main.cpp +++ b/lldb/test/API/commands/watchpoints/multiple_hits/main.cpp @@ -1,5 +1,6 @@ -#include #include +#include +#include alignas(16) uint8_t buf[32]; // This uses inline assembly to generate an instruction that writes to a large // block of memory. If it fails on your compiler/architecture, please add @@ -8,6 +9,7 @@ alignas(16) uint8_t buf[32]; // this test. int main() { + memset(buf, UINT32_MAX, 8); #if defined(__i386__) || defined(__x86_64__) asm volatile ("movdqa %%xmm0, %0" : : "m"(buf)); #elif defined(__arm__) diff --git a/lldb/test/API/commands/watchpoints/unaligned-watchpoint/main.c b/lldb/test/API/commands/watchpoints/unaligned-watchpoint/main.c index b071346e933a5..9d8de7a190b21 100644 --- a/lldb/test/API/commands/watchpoints/unaligned-watchpoint/main.c +++ b/lldb/test/API/commands/watchpoints/unaligned-watchpoint/main.c @@ -5,7 +5,7 @@ int main() { uint8_t buf[8]; uint64_t val; } a; - a.val = 0; // break here + a.val = UINT64_MAX; // break here for (int i = 0; i < 5; i++) { a.val = i; printf("a.val is %lu\n", a.val); diff --git a/lldb/test/API/functionalities/gdb_remote_client/TestNoWatchpointSupportInfo.py b/lldb/test/API/functionalities/gdb_remote_client/TestNoWatchpointSupportInfo.py index aaf4ef3e52c70..a51b228e917cc 100644 --- a/lldb/test/API/functionalities/gdb_remote_client/TestNoWatchpointSupportInfo.py +++ b/lldb/test/API/functionalities/gdb_remote_client/TestNoWatchpointSupportInfo.py @@ -58,7 +58,9 @@ def qXferRead(self, obj, annex, offset, length): print(result.GetOutput()) err = lldb.SBError() - wp = target.WatchAddress(0x100, 8, False, True, err) + wp_opts = lldb.SBWatchpointOptions() + wp_opts.SetWatchpointTypeWrite(lldb.eWatchpointWriteTypeOnModify) + wp = target.WatchpointCreateByAddress(0x100, 8, wp_opts, err) if self.TraceOn() and (err.Fail() or wp.IsValid == False): strm = lldb.SBStream() err.GetDescription(strm) diff --git a/lldb/test/API/functionalities/watchpoint/large-watchpoint/TestLargeWatchpoint.py b/lldb/test/API/functionalities/watchpoint/large-watchpoint/TestLargeWatchpoint.py index 07895c192ec1b..c5e161497e628 100644 --- a/lldb/test/API/functionalities/watchpoint/large-watchpoint/TestLargeWatchpoint.py +++ b/lldb/test/API/functionalities/watchpoint/large-watchpoint/TestLargeWatchpoint.py @@ -45,7 +45,9 @@ def test_large_watchpoint(self): # to a 1024 byte boundary to begin with, force alignment. wa_256_addr = (array_addr + 1024) & ~(1024 - 1) err = lldb.SBError() - wp = target.WatchAddress(wa_256_addr, 1024, False, True, err) + wp_opts = lldb.SBWatchpointOptions() + wp_opts.SetWatchpointTypeWrite(lldb.eWatchpointWriteTypeOnModify) + wp = target.WatchpointCreateByAddress(wa_256_addr, 1024, wp_opts, err) self.assertTrue(wp.IsValid()) self.assertSuccess(err) diff --git a/lldb/test/API/functionalities/watchpoint/modify-watchpoints/Makefile b/lldb/test/API/functionalities/watchpoint/modify-watchpoints/Makefile new file mode 100644 index 0000000000000..10495940055b6 --- /dev/null +++ b/lldb/test/API/functionalities/watchpoint/modify-watchpoints/Makefile @@ -0,0 +1,3 @@ +C_SOURCES := main.c + +include Makefile.rules diff --git a/lldb/test/API/functionalities/watchpoint/modify-watchpoints/TestModifyWatchpoint.py b/lldb/test/API/functionalities/watchpoint/modify-watchpoints/TestModifyWatchpoint.py new file mode 100644 index 0000000000000..2cbc8d43ce426 --- /dev/null +++ b/lldb/test/API/functionalities/watchpoint/modify-watchpoints/TestModifyWatchpoint.py @@ -0,0 +1,39 @@ +""" +Confirm that lldb modify watchpoints only stop +when the value being watched changes. +""" + + +import lldb +from lldbsuite.test.decorators import * +from lldbsuite.test.lldbtest import * +from lldbsuite.test import lldbutil + + +class ModifyWatchpointTestCase(TestBase): + NO_DEBUG_INFO_TESTCASE = True + + def test_modify_watchpoint(self): + """Test that a modify watchpoint only stops when the value changes.""" + self.build() + self.main_source_file = lldb.SBFileSpec("main.c") + (target, process, thread, bkpt) = lldbutil.run_to_source_breakpoint( + self, "break here", self.main_source_file + ) + + self.runCmd("watch set variable value") + process.Continue() + frame = process.GetSelectedThread().GetFrameAtIndex(0) + self.assertEqual(frame.locals["value"][0].GetValueAsUnsigned(), 10) + + process.Continue() + frame = process.GetSelectedThread().GetFrameAtIndex(0) + self.assertEqual(frame.locals["value"][0].GetValueAsUnsigned(), 5) + + process.Continue() + frame = process.GetSelectedThread().GetFrameAtIndex(0) + self.assertEqual(frame.locals["value"][0].GetValueAsUnsigned(), 7) + + process.Continue() + frame = process.GetSelectedThread().GetFrameAtIndex(0) + self.assertEqual(frame.locals["value"][0].GetValueAsUnsigned(), 9) diff --git a/lldb/test/API/functionalities/watchpoint/modify-watchpoints/main.c b/lldb/test/API/functionalities/watchpoint/modify-watchpoints/main.c new file mode 100644 index 0000000000000..819c96c15fb08 --- /dev/null +++ b/lldb/test/API/functionalities/watchpoint/modify-watchpoints/main.c @@ -0,0 +1,20 @@ +#include +int main() { + int value = 5; + + value = 5; // break here + value = 5; + value = 5; + value = 5; + value = 5; + value = 5; + value = 10; + value = 10; + value = 10; + value = 10; + value = 5; + value = 7; + value = 9; + + return value; +} diff --git a/lldb/test/API/functionalities/watchpoint/unaligned-spanning-two-dwords/TestUnalignedSpanningDwords.py b/lldb/test/API/functionalities/watchpoint/unaligned-spanning-two-dwords/TestUnalignedSpanningDwords.py index 602532c26b079..e37a74f1f5aac 100644 --- a/lldb/test/API/functionalities/watchpoint/unaligned-spanning-two-dwords/TestUnalignedSpanningDwords.py +++ b/lldb/test/API/functionalities/watchpoint/unaligned-spanning-two-dwords/TestUnalignedSpanningDwords.py @@ -46,7 +46,9 @@ def test_unaligned_watchpoint(self): a_bytebuf_6 = frame.GetValueForVariablePath("a.bytebuf[6]") a_bytebuf_6_addr = a_bytebuf_6.GetAddress().GetLoadAddress(target) err = lldb.SBError() - wp = target.WatchAddress(a_bytebuf_6_addr, 4, False, True, err) + wp_opts = lldb.SBWatchpointOptions() + wp_opts.SetWatchpointTypeWrite(lldb.eWatchpointWriteTypeOnModify) + wp = target.WatchpointCreateByAddress(a_bytebuf_6_addr, 4, wp_opts, err) self.assertTrue(err.Success()) self.assertTrue(wp.IsEnabled()) self.assertEqual(wp.GetWatchSize(), 4) diff --git a/lldb/test/API/python_api/default-constructor/sb_target.py b/lldb/test/API/python_api/default-constructor/sb_target.py index 2ba72d39f9101..1acf1024a0d91 100644 --- a/lldb/test/API/python_api/default-constructor/sb_target.py +++ b/lldb/test/API/python_api/default-constructor/sb_target.py @@ -53,7 +53,10 @@ def fuzz_obj(obj): obj.GetByteOrder() obj.GetTriple() error = lldb.SBError() - obj.WatchAddress(123, 8, True, True, error) + wp_opts = lldb.SBWatchpointOptions() + wp_opts.SetWatchpointTypeRead(True) + wp_opts.SetWatchpointTypeWrite(lldb.eWatchpointWriteTypeOnModify) + obj.WatchpointCreateByAddress(123, 8, wp_opts, error) obj.GetBroadcaster() obj.GetDescription(lldb.SBStream(), lldb.eDescriptionLevelBrief) obj.Clear() diff --git a/lldb/test/API/python_api/watchpoint/watchlocation/TestTargetWatchAddress.py b/lldb/test/API/python_api/watchpoint/watchlocation/TestTargetWatchAddress.py index 79124b3991e7d..bf31819d4070d 100644 --- a/lldb/test/API/python_api/watchpoint/watchlocation/TestTargetWatchAddress.py +++ b/lldb/test/API/python_api/watchpoint/watchlocation/TestTargetWatchAddress.py @@ -1,5 +1,5 @@ """ -Use lldb Python SBtarget.WatchAddress() API to create a watchpoint for write of '*g_char_ptr'. +Use lldb Python SBtarget.WatchpointCreateByAddress() API to create a watchpoint for write of '*g_char_ptr'. """ import lldb @@ -8,7 +8,7 @@ from lldbsuite.test import lldbutil -class TargetWatchAddressAPITestCase(TestBase): +class TargetWatchpointCreateByAddressPITestCase(TestBase): NO_DEBUG_INFO_TESTCASE = True def setUp(self): @@ -22,7 +22,7 @@ def setUp(self): self.violating_func = "do_bad_thing_with_location" def test_watch_address(self): - """Exercise SBTarget.WatchAddress() API to set a watchpoint.""" + """Exercise SBTarget.WatchpointCreateByAddress() API to set a watchpoint.""" self.build() exe = self.getBuildArtifact("a.out") @@ -51,8 +51,10 @@ def test_watch_address(self): ) # Watch for write to *g_char_ptr. error = lldb.SBError() - watchpoint = target.WatchAddress( - value.GetValueAsUnsigned(), 1, False, True, error + wp_opts = lldb.SBWatchpointOptions() + wp_opts.SetWatchpointTypeWrite(lldb.eWatchpointWriteTypeOnModify) + watchpoint = target.WatchpointCreateByAddress( + value.GetValueAsUnsigned(), 1, wp_opts, error ) self.assertTrue( value and watchpoint, "Successfully found the pointer and set a watchpoint" @@ -90,7 +92,7 @@ def test_watch_address(self): @skipIf(archs=["mips", "mipsel", "mips64", "mips64el"]) @skipIf(archs=["s390x"]) # Likewise on SystemZ def test_watch_address_with_invalid_watch_size(self): - """Exercise SBTarget.WatchAddress() API but pass an invalid watch_size.""" + """Exercise SBTarget.WatchpointCreateByAddress() API but pass an invalid watch_size.""" self.build() exe = self.getBuildArtifact("a.out") @@ -124,8 +126,10 @@ def test_watch_address_with_invalid_watch_size(self): if self.getArchitecture() not in ["arm64", "arm64e", "arm64_32"]: # Watch for write to *g_char_ptr. error = lldb.SBError() - watchpoint = target.WatchAddress( - value.GetValueAsUnsigned(), 365, False, True, error + wp_opts = lldb.SBWatchpointOptions() + wp_opts.SetWatchpointTypeWrite(lldb.eWatchpointWriteTypeOnModify) + watchpoint = target.WatchpointCreateByAddress( + value.GetValueAsUnsigned(), 365, wp_opts, error ) self.assertFalse(watchpoint) self.expect(