zturner created this revision.
The only real consumer of this is the `Process` class, so it makes sense (both
conceptually and from a layering standpoint) to hide this in the Process plugin.
This is intended to be NFC.
https://reviews.llvm.org/D31172
Files:
lldb/include/lldb/Core/ArchSpec.h
lldb/include/lldb/Target/Process.h
lldb/source/Core/ArchSpec.cpp
lldb/source/Interpreter/CommandObject.cpp
lldb/source/Target/Process.cpp
lldb/source/Target/Thread.cpp
Index: lldb/source/Target/Thread.cpp
===================================================================
--- lldb/source/Target/Thread.cpp
+++ lldb/source/Target/Thread.cpp
@@ -441,10 +441,7 @@
if (m_stop_info_override_stop_id != process_stop_id) {
m_stop_info_override_stop_id = process_stop_id;
if (m_stop_info_sp) {
- ArchSpec::StopInfoOverrideCallbackType callback =
- GetProcess()->GetStopInfoOverrideCallback();
- if (callback)
- callback(*this);
+ GetProcess()->InvokeStopInfoOverrideCallback(*this);
}
}
}
Index: lldb/source/Target/Process.cpp
===================================================================
--- lldb/source/Target/Process.cpp
+++ lldb/source/Target/Process.cpp
@@ -17,7 +17,9 @@
#include "llvm/Support/Threading.h"
// Project includes
+#include "Plugins/Process/Utility/ARMDefines.h"
#include "Plugins/Process/Utility/InferiorCallPOSIX.h"
+#include "Plugins/Process/Utility/InstructionUtils.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Breakpoint/StoppointCallbackContext.h"
#include "lldb/Core/Debugger.h"
@@ -2397,6 +2399,104 @@
return bytes_written;
}
+static void StopInfoOverrideCallbackTypeARM(lldb_private::Thread &thread) {
+ // We need to check if we are stopped in Thumb mode in a IT instruction
+ // and detect if the condition doesn't pass. If this is the case it means
+ // we won't actually execute this instruction. If this happens we need to
+ // clear the stop reason to no thread plans think we are stopped for a
+ // reason and the plans should keep going.
+ //
+ // We do this because when single stepping many ARM processes, debuggers
+ // often use the BVR/BCR registers that says "stop when the PC is not
+ // equal to its current value". This method of stepping means we can end
+ // up stopping on instructions inside an if/then block that wouldn't get
+ // executed. By fixing this we can stop the debugger from seeming like
+ // you stepped through both the "if" _and_ the "else" clause when source
+ // level stepping because the debugger stops regardless due to the BVR/BCR
+ // triggering a stop.
+ //
+ // It also means we can set breakpoints on instructions inside an an
+ // if/then block and correctly skip them if we use the BKPT instruction.
+ // The ARM and Thumb BKPT instructions are unconditional even when executed
+ // in a Thumb IT block.
+ //
+ // If your debugger inserts software traps in ARM/Thumb code, it will
+ // need to use 16 and 32 bit instruction for 16 and 32 bit thumb
+ // instructions respectively. If your debugger inserts a 16 bit thumb
+ // trap on top of a 32 bit thumb instruction for an opcode that is inside
+ // an if/then, it will change the it/then to conditionally execute your
+ // 16 bit trap and then cause your program to crash if it executes the
+ // trailing 16 bits (the second half of the 32 bit thumb instruction you
+ // partially overwrote).
+
+ RegisterContextSP reg_ctx_sp(thread.GetRegisterContext());
+ if (reg_ctx_sp) {
+ const uint32_t cpsr = reg_ctx_sp->GetFlags(0);
+ if (cpsr != 0) {
+ // Read the J and T bits to get the ISETSTATE
+ const uint32_t J = Bit32(cpsr, 24);
+ const uint32_t T = Bit32(cpsr, 5);
+ const uint32_t ISETSTATE = J << 1 | T;
+ if (ISETSTATE == 0) {
+// NOTE: I am pretty sure we want to enable the code below
+// that detects when we stop on an instruction in ARM mode
+// that is conditional and the condition doesn't pass. This
+// can happen if you set a breakpoint on an instruction that
+// is conditional. We currently will _always_ stop on the
+// instruction which is bad. You can also run into this while
+// single stepping and you could appear to run code in the "if"
+// and in the "else" clause because it would stop at all of the
+// conditional instructions in both.
+// In such cases, we really don't want to stop at this location.
+// I will check with the lldb-dev list first before I enable this.
+#if 0
+ // ARM mode: check for condition on intsruction
+ const addr_t pc = reg_ctx_sp->GetPC();
+ Error error;
+ // If we fail to read the opcode we will get UINT64_MAX as the
+ // result in "opcode" which we can use to detect if we read a
+ // valid opcode.
+ const uint64_t opcode = thread.GetProcess()->ReadUnsignedIntegerFromMemory(pc, 4, UINT64_MAX, error);
+ if (opcode <= UINT32_MAX)
+ {
+ const uint32_t condition = Bits32((uint32_t)opcode, 31, 28);
+ if (!ARMConditionPassed(condition, cpsr))
+ {
+ // We ARE stopped on an ARM instruction whose condition doesn't
+ // pass so this instruction won't get executed.
+ // Regardless of why it stopped, we need to clear the stop info
+ thread.SetStopInfo(StopInfoSP());
+ }
+ }
+#endif
+ } else if (ISETSTATE == 1) {
+ // Thumb mode
+ const uint32_t ITSTATE =
+ Bits32(cpsr, 15, 10) << 2 | Bits32(cpsr, 26, 25);
+ if (ITSTATE != 0) {
+ const uint32_t condition = Bits32(ITSTATE, 7, 4);
+ if (!ARMConditionPassed(condition, cpsr)) {
+ // We ARE stopped in a Thumb IT instruction on an instruction whose
+ // condition doesn't pass so this instruction won't get executed.
+ // Regardless of why it stopped, we need to clear the stop info
+ thread.SetStopInfo(StopInfoSP());
+ }
+ }
+ }
+ }
+ }
+}
+
+void Process::SetStopInfoOverrideCallback(const ArchSpec &Arch) {
+ if (Arch.GetMachine() == llvm::Triple::arm)
+ m_stop_info_override_callback = StopInfoOverrideCallbackTypeARM;
+}
+
+void Process::InvokeStopInfoOverrideCallback(lldb_private::Thread &Thread) {
+ if (m_stop_info_override_callback)
+ m_stop_info_override_callback(Thread);
+}
+
size_t Process::WriteMemory(addr_t addr, const void *buf, size_t size,
Error &error) {
#if defined(ENABLE_MEMORY_CACHING)
@@ -2797,8 +2897,7 @@
else
StartPrivateStateThread();
- m_stop_info_override_callback =
- GetTarget().GetArchitecture().GetStopInfoOverrideCallback();
+ SetStopInfoOverrideCallback(GetTarget().GetArchitecture());
// Target was stopped at entry as was intended. Need to notify the
// listeners
@@ -3217,7 +3316,7 @@
}
}
- m_stop_info_override_callback = process_arch.GetStopInfoOverrideCallback();
+ SetStopInfoOverrideCallback(process_arch);
}
Error Process::ConnectRemote(Stream *strm, llvm::StringRef remote_url) {
Index: lldb/source/Interpreter/CommandObject.cpp
===================================================================
--- lldb/source/Interpreter/CommandObject.cpp
+++ lldb/source/Interpreter/CommandObject.cpp
@@ -33,6 +33,9 @@
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Interpreter/CommandReturnObject.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringSet.h"
+
using namespace lldb;
using namespace lldb_private;
@@ -1017,15 +1020,19 @@
return handled;
}
+static std::string computeArchHelp() {
+ llvm::StringSet<> Archs;
+ ArchSpec::AutoComplete("", Archs);
+ std::string Result;
+ llvm::raw_string_ostream OS(Result);
+ OS << "These are the supported architecture names:\n";
+ OS << llvm::join_range(Archs.keys(), "\n");
+ return OS.str();
+}
+
static llvm::StringRef arch_helper() {
- static StreamString g_archs_help;
- if (g_archs_help.Empty()) {
- StringList archs;
- ArchSpec::AutoComplete(llvm::StringRef(), archs);
- g_archs_help.Printf("These are the supported architecture names:\n");
- archs.Join("\n", g_archs_help);
- }
- return g_archs_help.GetString();
+ static std::string Help = computeArchHelp();
+ return Help;
}
CommandObject::ArgumentTableEntry CommandObject::g_arguments_data[] = {
Index: lldb/source/Core/ArchSpec.cpp
===================================================================
--- lldb/source/Core/ArchSpec.cpp
+++ lldb/source/Core/ArchSpec.cpp
@@ -22,14 +22,8 @@
#include "llvm/Support/Host.h"
// Project includes
-#include "Plugins/Process/Utility/ARMDefines.h"
-#include "Plugins/Process/Utility/InstructionUtils.h"
-#include "lldb/Core/StringList.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Target/Platform.h"
-#include "lldb/Target/Process.h"
-#include "lldb/Target/RegisterContext.h"
-#include "lldb/Target/Thread.h"
#include "lldb/Utility/Endian.h"
#include "lldb/Utility/NameMatches.h"
#include "lldb/Utility/RegularExpression.h"
@@ -256,17 +250,18 @@
const char *name;
};
-size_t ArchSpec::AutoComplete(llvm::StringRef name, StringList &matches) {
+size_t ArchSpec::AutoComplete(llvm::StringRef name,
+ llvm::StringSet<> &matches) {
if (!name.empty()) {
for (uint32_t i = 0; i < llvm::array_lengthof(g_core_definitions); ++i) {
if (NameMatches(g_core_definitions[i].name, NameMatch::StartsWith, name))
- matches.AppendString(g_core_definitions[i].name);
+ matches.insert(g_core_definitions[i].name);
}
} else {
for (uint32_t i = 0; i < llvm::array_lengthof(g_core_definitions); ++i)
- matches.AppendString(g_core_definitions[i].name);
+ matches.insert(g_core_definitions[i].name);
}
- return matches.GetSize();
+ return matches.size();
}
#define CPU_ANY (UINT32_MAX)
@@ -1499,102 +1494,6 @@
return lhs_core < rhs_core;
}
-static void StopInfoOverrideCallbackTypeARM(lldb_private::Thread &thread) {
- // We need to check if we are stopped in Thumb mode in a IT instruction
- // and detect if the condition doesn't pass. If this is the case it means
- // we won't actually execute this instruction. If this happens we need to
- // clear the stop reason to no thread plans think we are stopped for a
- // reason and the plans should keep going.
- //
- // We do this because when single stepping many ARM processes, debuggers
- // often use the BVR/BCR registers that says "stop when the PC is not
- // equal to its current value". This method of stepping means we can end
- // up stopping on instructions inside an if/then block that wouldn't get
- // executed. By fixing this we can stop the debugger from seeming like
- // you stepped through both the "if" _and_ the "else" clause when source
- // level stepping because the debugger stops regardless due to the BVR/BCR
- // triggering a stop.
- //
- // It also means we can set breakpoints on instructions inside an an
- // if/then block and correctly skip them if we use the BKPT instruction.
- // The ARM and Thumb BKPT instructions are unconditional even when executed
- // in a Thumb IT block.
- //
- // If your debugger inserts software traps in ARM/Thumb code, it will
- // need to use 16 and 32 bit instruction for 16 and 32 bit thumb
- // instructions respectively. If your debugger inserts a 16 bit thumb
- // trap on top of a 32 bit thumb instruction for an opcode that is inside
- // an if/then, it will change the it/then to conditionally execute your
- // 16 bit trap and then cause your program to crash if it executes the
- // trailing 16 bits (the second half of the 32 bit thumb instruction you
- // partially overwrote).
-
- RegisterContextSP reg_ctx_sp(thread.GetRegisterContext());
- if (reg_ctx_sp) {
- const uint32_t cpsr = reg_ctx_sp->GetFlags(0);
- if (cpsr != 0) {
- // Read the J and T bits to get the ISETSTATE
- const uint32_t J = Bit32(cpsr, 24);
- const uint32_t T = Bit32(cpsr, 5);
- const uint32_t ISETSTATE = J << 1 | T;
- if (ISETSTATE == 0) {
-// NOTE: I am pretty sure we want to enable the code below
-// that detects when we stop on an instruction in ARM mode
-// that is conditional and the condition doesn't pass. This
-// can happen if you set a breakpoint on an instruction that
-// is conditional. We currently will _always_ stop on the
-// instruction which is bad. You can also run into this while
-// single stepping and you could appear to run code in the "if"
-// and in the "else" clause because it would stop at all of the
-// conditional instructions in both.
-// In such cases, we really don't want to stop at this location.
-// I will check with the lldb-dev list first before I enable this.
-#if 0
- // ARM mode: check for condition on intsruction
- const addr_t pc = reg_ctx_sp->GetPC();
- Error error;
- // If we fail to read the opcode we will get UINT64_MAX as the
- // result in "opcode" which we can use to detect if we read a
- // valid opcode.
- const uint64_t opcode = thread.GetProcess()->ReadUnsignedIntegerFromMemory(pc, 4, UINT64_MAX, error);
- if (opcode <= UINT32_MAX)
- {
- const uint32_t condition = Bits32((uint32_t)opcode, 31, 28);
- if (!ARMConditionPassed(condition, cpsr))
- {
- // We ARE stopped on an ARM instruction whose condition doesn't
- // pass so this instruction won't get executed.
- // Regardless of why it stopped, we need to clear the stop info
- thread.SetStopInfo (StopInfoSP());
- }
- }
-#endif
- } else if (ISETSTATE == 1) {
- // Thumb mode
- const uint32_t ITSTATE =
- Bits32(cpsr, 15, 10) << 2 | Bits32(cpsr, 26, 25);
- if (ITSTATE != 0) {
- const uint32_t condition = Bits32(ITSTATE, 7, 4);
- if (!ARMConditionPassed(condition, cpsr)) {
- // We ARE stopped in a Thumb IT instruction on an instruction whose
- // condition doesn't pass so this instruction won't get executed.
- // Regardless of why it stopped, we need to clear the stop info
- thread.SetStopInfo(StopInfoSP());
- }
- }
- }
- }
- }
-}
-
-ArchSpec::StopInfoOverrideCallbackType
-ArchSpec::GetStopInfoOverrideCallback() const {
- const llvm::Triple::ArchType machine = GetMachine();
- if (machine == llvm::Triple::arm)
- return StopInfoOverrideCallbackTypeARM;
- return nullptr;
-}
-
bool ArchSpec::IsFullySpecifiedTriple() const {
const auto &user_specified_triple = GetTriple();
Index: lldb/include/lldb/Target/Process.h
===================================================================
--- lldb/include/lldb/Target/Process.h
+++ lldb/include/lldb/Target/Process.h
@@ -2512,9 +2512,29 @@
OperatingSystem *GetOperatingSystem() { return m_os_ap.get(); }
- ArchSpec::StopInfoOverrideCallbackType GetStopInfoOverrideCallback() const {
- return m_stop_info_override_callback;
- }
+ //------------------------------------------------------------------
+ /// Get a stop info override callback for the current architecture.
+ ///
+ /// Most platform specific code should go in lldb_private::Platform,
+ /// but there are cases where no matter which platform you are on
+ /// certain things hold true.
+ ///
+ /// This callback is currently intended to handle cases where a
+ /// program stops at an instruction that won't get executed and it
+ /// allows the stop reasonm, like "breakpoint hit", to be replaced
+ /// with a different stop reason like "no stop reason".
+ ///
+ /// This is specifically used for ARM in Thumb code when we stop in
+ /// an IT instruction (if/then/else) where the instruction won't get
+ /// executed and therefore it wouldn't be correct to show the program
+ /// stopped at the current PC. The code is generic and applies to all
+ /// ARM CPUs.
+ ///
+ /// @return NULL or a valid stop info override callback for the
+ /// current architecture.
+ //------------------------------------------------------------------
+ typedef void (*StopInfoOverrideCallbackType)(lldb_private::Thread &);
+ void InvokeStopInfoOverrideCallback(lldb_private::Thread &Thread);
virtual LanguageRuntime *GetLanguageRuntime(lldb::LanguageType language,
bool retry_if_null = true);
@@ -3036,7 +3056,7 @@
std::vector<PreResumeCallbackAndBaton> m_pre_resume_actions;
ProcessRunLock m_public_run_lock;
ProcessRunLock m_private_run_lock;
- ArchSpec::StopInfoOverrideCallbackType m_stop_info_override_callback;
+ StopInfoOverrideCallbackType m_stop_info_override_callback;
bool m_currently_handling_do_on_removals;
bool m_resume_requested; // If m_currently_handling_event or
// m_currently_handling_do_on_removals are true,
@@ -3081,6 +3101,8 @@
void ResumePrivateStateThread();
private:
+ void SetStopInfoOverrideCallback(const ArchSpec &Arch);
+
struct PrivateStateThreadArgs {
PrivateStateThreadArgs(Process *p, bool s)
: process(p), is_secondary_thread(s){};
Index: lldb/include/lldb/Core/ArchSpec.h
===================================================================
--- lldb/include/lldb/Core/ArchSpec.h
+++ lldb/include/lldb/Core/ArchSpec.h
@@ -14,6 +14,7 @@
#include "lldb/Utility/ConstString.h"
#include "lldb/lldb-forward.h"
+#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/Triple.h"
namespace lldb_private {
@@ -239,8 +240,6 @@
};
- typedef void (*StopInfoOverrideCallbackType)(lldb_private::Thread &thread);
-
//------------------------------------------------------------------
/// Default constructor.
///
@@ -283,7 +282,7 @@
//------------------------------------------------------------------
const ArchSpec &operator=(const ArchSpec &rhs);
- static size_t AutoComplete(llvm::StringRef name, StringList &matches);
+ static size_t AutoComplete(llvm::StringRef name, llvm::StringSet<> &matches);
//------------------------------------------------------------------
/// Returns a static string representing the current architecture.
@@ -555,29 +554,6 @@
//------------------------------------------------------------------
bool IsCompatibleMatch(const ArchSpec &rhs) const;
- //------------------------------------------------------------------
- /// Get a stop info override callback for the current architecture.
- ///
- /// Most platform specific code should go in lldb_private::Platform,
- /// but there are cases where no matter which platform you are on
- /// certain things hold true.
- ///
- /// This callback is currently intended to handle cases where a
- /// program stops at an instruction that won't get executed and it
- /// allows the stop reasonm, like "breakpoint hit", to be replaced
- /// with a different stop reason like "no stop reason".
- ///
- /// This is specifically used for ARM in Thumb code when we stop in
- /// an IT instruction (if/then/else) where the instruction won't get
- /// executed and therefore it wouldn't be correct to show the program
- /// stopped at the current PC. The code is generic and applies to all
- /// ARM CPUs.
- ///
- /// @return NULL or a valid stop info override callback for the
- /// current architecture.
- //------------------------------------------------------------------
- StopInfoOverrideCallbackType GetStopInfoOverrideCallback() const;
-
bool IsFullySpecifiedTriple() const;
void PiecewiseTripleCompare(const ArchSpec &other, bool &arch_different,
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