f9b58c5198
Since we introduced the API to set signal handler and print a stacktrace, we should avoid glibc's backtrace, which may call malloc. Basically, we choose the way to produce a stacktrace as same as perftools. Also, I removed GetStackFrames, which is not used and not implemented with glibc. git-svn-id: https://google-glog.googlecode.com/svn/trunk@16 eb4d4688-79bd-11dd-afb4-1d65580434c0
114 lines
3.8 KiB
C++
114 lines
3.8 KiB
C++
// Copyright 2000 - 2007 Google Inc.
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// All rights reserved.
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//
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// Produce stack trace
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#include <stdint.h> // for uintptr_t
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#include "utilities.h" // for OS_* macros
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#if !defined(OS_WINDOWS)
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#include <unistd.h>
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#include <sys/mman.h>
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#endif
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#include <stdio.h> // for NULL
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#include "stacktrace.h"
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_START_GOOGLE_NAMESPACE_
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// Given a pointer to a stack frame, locate and return the calling
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// stackframe, or return NULL if no stackframe can be found. Perform sanity
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// checks (the strictness of which is controlled by the boolean parameter
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// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned.
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template<bool STRICT_UNWINDING>
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static void **NextStackFrame(void **old_sp) {
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void **new_sp = (void **) *old_sp;
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// Check that the transition from frame pointer old_sp to frame
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// pointer new_sp isn't clearly bogus
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if (STRICT_UNWINDING) {
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// With the stack growing downwards, older stack frame must be
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// at a greater address that the current one.
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if (new_sp <= old_sp) return NULL;
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// Assume stack frames larger than 100,000 bytes are bogus.
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if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return NULL;
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} else {
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// In the non-strict mode, allow discontiguous stack frames.
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// (alternate-signal-stacks for example).
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if (new_sp == old_sp) return NULL;
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// And allow frames upto about 1MB.
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if ((new_sp > old_sp)
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&& ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return NULL;
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}
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if ((uintptr_t)new_sp & (sizeof(void *) - 1)) return NULL;
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#ifdef __i386__
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// On 64-bit machines, the stack pointer can be very close to
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// 0xffffffff, so we explicitly check for a pointer into the
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// last two pages in the address space
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if ((uintptr_t)new_sp >= 0xffffe000) return NULL;
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#endif
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#if !defined(OS_WINDOWS)
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if (!STRICT_UNWINDING) {
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// Lax sanity checks cause a crash in 32-bit tcmalloc/crash_reason_test
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// on AMD-based machines with VDSO-enabled kernels.
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// Make an extra sanity check to insure new_sp is readable.
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// Note: NextStackFrame<false>() is only called while the program
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// is already on its last leg, so it's ok to be slow here.
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static int page_size = getpagesize();
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void *new_sp_aligned = (void *)((uintptr_t)new_sp & ~(page_size - 1));
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if (msync(new_sp_aligned, page_size, MS_ASYNC) == -1)
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return NULL;
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}
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#endif
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return new_sp;
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}
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// If you change this function, also change GetStackFrames below.
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int GetStackTrace(void** result, int max_depth, int skip_count) {
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void **sp;
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#ifdef __i386__
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// Stack frame format:
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// sp[0] pointer to previous frame
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// sp[1] caller address
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// sp[2] first argument
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// ...
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sp = (void **)&result - 2;
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#endif
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#ifdef __x86_64__
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// __builtin_frame_address(0) can return the wrong address on gcc-4.1.0-k8
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unsigned long rbp;
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// Move the value of the register %rbp into the local variable rbp.
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// We need 'volatile' to prevent this instruction from getting moved
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// around during optimization to before function prologue is done.
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// An alternative way to achieve this
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// would be (before this __asm__ instruction) to call Noop() defined as
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// static void Noop() __attribute__ ((noinline)); // prevent inlining
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// static void Noop() { asm(""); } // prevent optimizing-away
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__asm__ volatile ("mov %%rbp, %0" : "=r" (rbp));
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// Arguments are passed in registers on x86-64, so we can't just
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// offset from &result
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sp = (void **) rbp;
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#endif
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int n = 0;
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while (sp && n < max_depth) {
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if (*(sp+1) == (void *)0) {
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// In 64-bit code, we often see a frame that
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// points to itself and has a return address of 0.
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break;
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}
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if (skip_count > 0) {
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skip_count--;
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} else {
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result[n++] = *(sp+1);
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}
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// Use strict unwinding rules.
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sp = NextStackFrame<true>(sp);
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}
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return n;
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}
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_END_GOOGLE_NAMESPACE_
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