221 lines
7.5 KiB
C++
221 lines
7.5 KiB
C++
//===-- sanitizer_stacktrace.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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//
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// This file is shared between AddressSanitizer and ThreadSanitizer
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// run-time libraries.
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_STACKTRACE_H
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#define SANITIZER_STACKTRACE_H
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#include "sanitizer_common.h"
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#include "sanitizer_internal_defs.h"
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#include "sanitizer_platform.h"
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namespace __sanitizer {
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struct BufferedStackTrace;
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static const u32 kStackTraceMax = 256;
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#if SANITIZER_LINUX && defined(__mips__)
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# define SANITIZER_CAN_FAST_UNWIND 0
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#elif SANITIZER_WINDOWS
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# define SANITIZER_CAN_FAST_UNWIND 0
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#else
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# define SANITIZER_CAN_FAST_UNWIND 1
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#endif
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// Fast unwind is the only option on Mac for now; we will need to
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// revisit this macro when slow unwind works on Mac, see
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// https://github.com/google/sanitizers/issues/137
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#if SANITIZER_MAC
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# define SANITIZER_CAN_SLOW_UNWIND 0
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#else
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# define SANITIZER_CAN_SLOW_UNWIND 1
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#endif
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struct StackTrace {
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const uptr *trace;
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u32 size;
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u32 tag;
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static const int TAG_UNKNOWN = 0;
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static const int TAG_ALLOC = 1;
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static const int TAG_DEALLOC = 2;
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static const int TAG_CUSTOM = 100; // Tool specific tags start here.
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StackTrace() : trace(nullptr), size(0), tag(0) {}
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StackTrace(const uptr *trace, u32 size) : trace(trace), size(size), tag(0) {}
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StackTrace(const uptr *trace, u32 size, u32 tag)
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: trace(trace), size(size), tag(tag) {}
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// Prints a symbolized stacktrace, followed by an empty line.
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void Print() const;
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// Prints a symbolized stacktrace to the output string, followed by an empty
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// line.
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void PrintTo(InternalScopedString *output) const;
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// Prints a symbolized stacktrace to the output buffer, followed by an empty
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// line. Returns the number of symbols that should have been written to buffer
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// (not including trailing '\0'). Thus, the string is truncated iff return
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// value is not less than "out_buf_size".
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uptr PrintTo(char *out_buf, uptr out_buf_size) const;
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static bool WillUseFastUnwind(bool request_fast_unwind) {
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if (!SANITIZER_CAN_FAST_UNWIND)
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return false;
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if (!SANITIZER_CAN_SLOW_UNWIND)
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return true;
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return request_fast_unwind;
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}
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static uptr GetCurrentPc();
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static inline uptr GetPreviousInstructionPc(uptr pc);
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static uptr GetNextInstructionPc(uptr pc);
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};
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// Performance-critical, must be in the header.
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ALWAYS_INLINE
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uptr StackTrace::GetPreviousInstructionPc(uptr pc) {
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#if defined(__arm__)
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// T32 (Thumb) branch instructions might be 16 or 32 bit long,
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// so we return (pc-2) in that case in order to be safe.
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// For A32 mode we return (pc-4) because all instructions are 32 bit long.
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return (pc - 3) & (~1);
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#elif defined(__powerpc__) || defined(__powerpc64__) || defined(__aarch64__)
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// PCs are always 4 byte aligned.
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return pc - 4;
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#elif defined(__sparc__) || defined(__mips__)
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return pc - 8;
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#elif SANITIZER_RISCV64
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// RV-64 has variable instruciton length...
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// C extentions gives us 2-byte instructoins
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// RV-64 has 4-byte instructions
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// + RISCV architecture allows instructions up to 8 bytes
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// It seems difficult to figure out the exact instruction length -
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// pc - 2 seems like a safe option for the purposes of stack tracing
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return pc - 2;
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#else
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return pc - 1;
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#endif
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}
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// StackTrace that owns the buffer used to store the addresses.
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struct BufferedStackTrace : public StackTrace {
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uptr trace_buffer[kStackTraceMax];
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uptr top_frame_bp; // Optional bp of a top frame.
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BufferedStackTrace() : StackTrace(trace_buffer, 0), top_frame_bp(0) {}
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void Init(const uptr *pcs, uptr cnt, uptr extra_top_pc = 0);
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// Get the stack trace with the given pc and bp.
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// The pc will be in the position 0 of the resulting stack trace.
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// The bp may refer to the current frame or to the caller's frame.
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void Unwind(uptr pc, uptr bp, void *context, bool request_fast,
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u32 max_depth = kStackTraceMax) {
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top_frame_bp = (max_depth > 0) ? bp : 0;
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// Small max_depth optimization
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if (max_depth <= 1) {
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if (max_depth == 1)
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trace_buffer[0] = pc;
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size = max_depth;
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return;
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}
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UnwindImpl(pc, bp, context, request_fast, max_depth);
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}
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void Unwind(u32 max_depth, uptr pc, uptr bp, void *context, uptr stack_top,
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uptr stack_bottom, bool request_fast_unwind);
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void Reset() {
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*static_cast<StackTrace *>(this) = StackTrace(trace_buffer, 0);
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top_frame_bp = 0;
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}
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private:
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// Every runtime defines its own implementation of this method
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void UnwindImpl(uptr pc, uptr bp, void *context, bool request_fast,
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u32 max_depth);
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// UnwindFast/Slow have platform-specific implementations
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void UnwindFast(uptr pc, uptr bp, uptr stack_top, uptr stack_bottom,
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u32 max_depth);
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void UnwindSlow(uptr pc, u32 max_depth);
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void UnwindSlow(uptr pc, void *context, u32 max_depth);
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void PopStackFrames(uptr count);
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uptr LocatePcInTrace(uptr pc);
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BufferedStackTrace(const BufferedStackTrace &) = delete;
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void operator=(const BufferedStackTrace &) = delete;
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friend class FastUnwindTest;
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};
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#if defined(__s390x__)
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static const uptr kFrameSize = 160;
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#elif defined(__s390__)
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static const uptr kFrameSize = 96;
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#else
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static const uptr kFrameSize = 2 * sizeof(uhwptr);
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#endif
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// Check if given pointer points into allocated stack area.
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static inline bool IsValidFrame(uptr frame, uptr stack_top, uptr stack_bottom) {
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return frame > stack_bottom && frame < stack_top - kFrameSize;
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}
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} // namespace __sanitizer
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// Use this macro if you want to print stack trace with the caller
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// of the current function in the top frame.
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#define GET_CALLER_PC_BP \
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uptr bp = GET_CURRENT_FRAME(); \
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uptr pc = GET_CALLER_PC();
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#define GET_CALLER_PC_BP_SP \
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GET_CALLER_PC_BP; \
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uptr local_stack; \
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uptr sp = (uptr)&local_stack
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// Use this macro if you want to print stack trace with the current
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// function in the top frame.
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#define GET_CURRENT_PC_BP \
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uptr bp = GET_CURRENT_FRAME(); \
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uptr pc = StackTrace::GetCurrentPc()
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#define GET_CURRENT_PC_BP_SP \
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GET_CURRENT_PC_BP; \
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uptr local_stack; \
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uptr sp = (uptr)&local_stack
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// GET_CURRENT_PC() is equivalent to StackTrace::GetCurrentPc().
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// Optimized x86 version is faster than GetCurrentPc because
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// it does not involve a function call, instead it reads RIP register.
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// Reads of RIP by an instruction return RIP pointing to the next
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// instruction, which is exactly what we want here, thus 0 offset.
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// It needs to be a macro because otherwise we will get the name
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// of this function on the top of most stacks. Attribute artificial
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// does not do what it claims to do, unfortunatley. And attribute
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// __nodebug__ is clang-only. If we would have an attribute that
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// would remove this function from debug info, we could simply make
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// StackTrace::GetCurrentPc() faster.
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#if defined(__x86_64__)
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# define GET_CURRENT_PC() \
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(__extension__({ \
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uptr pc; \
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asm("lea 0(%%rip), %0" : "=r"(pc)); \
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pc; \
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}))
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#else
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# define GET_CURRENT_PC() StackTrace::GetCurrentPc()
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#endif
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#endif // SANITIZER_STACKTRACE_H
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