059f39d2f4
A trace might contain events traced during the target's execution. For example, a thread might be paused for some period of time due to context switches or breakpoints, which actually force a context switch. Not only that, a trace might be paused because the CPU decides to trace only a specific part of the target, like the address filtering provided by intel pt, which will cause pause events. Besides this case, other kinds of events might exist. This patch adds the method `TraceCursor::GetEvents()`` that returns the list of events that happened right before the instruction being pointed at by the cursor. Some refactors were done to make this change simpler. Besides this new API, the instruction dumper now supports the -e flag which shows pause events, like in the following example, where pauses happened due to breakpoints. ``` thread #1: tid = 2717361 a.out`main + 20 at main.cpp:27:20 0: 0x00000000004023d9 leaq -0x1200(%rbp), %rax [paused] 1: 0x00000000004023e0 movq %rax, %rdi [paused] 2: 0x00000000004023e3 callq 0x403a62 ; std::vector<int, std::allocator<int> >::vector at stl_vector.h:391:7 a.out`std::vector<int, std::allocator<int> >::vector() at stl_vector.h:391:7 3: 0x0000000000403a62 pushq %rbp 4: 0x0000000000403a63 movq %rsp, %rbp ``` The `dump info` command has also been updated and now it shows the number of instructions that have associated events. Differential Revision: https://reviews.llvm.org/D123982
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
//===-- TraceCursor.cpp -----------------------------------------*- 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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#include "lldb/Target/TraceCursor.h"
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#include "lldb/Target/ExecutionContext.h"
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using namespace lldb;
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using namespace lldb_private;
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using namespace llvm;
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TraceCursor::TraceCursor(lldb::ThreadSP thread_sp)
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: m_exe_ctx_ref(ExecutionContext(thread_sp)) {}
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ExecutionContextRef &TraceCursor::GetExecutionContextRef() {
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return m_exe_ctx_ref;
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}
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void TraceCursor::SetGranularity(
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lldb::TraceInstructionControlFlowType granularity) {
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m_granularity = granularity;
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}
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void TraceCursor::SetIgnoreErrors(bool ignore_errors) {
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m_ignore_errors = ignore_errors;
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}
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void TraceCursor::SetForwards(bool forwards) { m_forwards = forwards; }
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bool TraceCursor::IsForwards() const { return m_forwards; }
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const char *trace_event_utils::EventToDisplayString(lldb::TraceEvents event) {
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switch (event) {
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case lldb::eTraceEventPaused:
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return "paused";
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}
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return nullptr;
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}
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void trace_event_utils::ForEachEvent(
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lldb::TraceEvents events,
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std::function<void(lldb::TraceEvents event)> callback) {
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while (events) {
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TraceEvents event = static_cast<TraceEvents>(events & ~(events - 1));
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callback(event);
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events &= ~event;
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}
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}
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