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authorAndrew Turner <andrew@FreeBSD.org>2013-01-18 20:06:45 +0000
committerAndrew Turner <andrew@FreeBSD.org>2013-01-18 20:06:45 +0000
commit58aabf08b77d221489f10e274812ec60917c21a8 (patch)
treeb946f82269be87d83f086167c762c362e734c5bb /lib/sanitizer_common/sanitizer_stacktrace.cc
parent37dfff057418e02f8e5322da12684dd927e3d881 (diff)
downloadsrc-58aabf08b77d221489f10e274812ec60917c21a8.tar.gz
src-58aabf08b77d221489f10e274812ec60917c21a8.zip
Import compiler-rt r172839.vendor/compiler-rt/compiler-rt-r172839
Notes
Notes: svn path=/vendor/compiler-rt/dist/; revision=245614 svn path=/vendor/compiler-rt/compiler-rt-r172839/; revision=245615; tag=vendor/compiler-rt/compiler-rt-r172839
Diffstat (limited to 'lib/sanitizer_common/sanitizer_stacktrace.cc')
-rw-r--r--lib/sanitizer_common/sanitizer_stacktrace.cc262
1 files changed, 262 insertions, 0 deletions
diff --git a/lib/sanitizer_common/sanitizer_stacktrace.cc b/lib/sanitizer_common/sanitizer_stacktrace.cc
new file mode 100644
index 000000000000..109a674e45b3
--- /dev/null
+++ b/lib/sanitizer_common/sanitizer_stacktrace.cc
@@ -0,0 +1,262 @@
+//===-- sanitizer_stacktrace.cc -------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is shared between AddressSanitizer and ThreadSanitizer
+// run-time libraries.
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_common.h"
+#include "sanitizer_procmaps.h"
+#include "sanitizer_stacktrace.h"
+#include "sanitizer_symbolizer.h"
+
+namespace __sanitizer {
+static const char *StripPathPrefix(const char *filepath,
+ const char *strip_file_prefix) {
+ if (filepath == internal_strstr(filepath, strip_file_prefix))
+ return filepath + internal_strlen(strip_file_prefix);
+ return filepath;
+}
+
+// ----------------------- StackTrace ----------------------------- {{{1
+uptr StackTrace::GetPreviousInstructionPc(uptr pc) {
+#ifdef __arm__
+ // Cancel Thumb bit.
+ pc = pc & (~1);
+#endif
+#if defined(__powerpc__) || defined(__powerpc64__)
+ // PCs are always 4 byte aligned.
+ return pc - 4;
+#elif defined(__sparc__)
+ return pc - 8;
+#else
+ return pc - 1;
+#endif
+}
+
+static void PrintStackFramePrefix(uptr frame_num, uptr pc) {
+ Printf(" #%zu 0x%zx", frame_num, pc);
+}
+
+static void PrintSourceLocation(const char *file, int line, int column,
+ const char *strip_file_prefix) {
+ CHECK(file);
+ Printf(" %s", StripPathPrefix(file, strip_file_prefix));
+ if (line > 0) {
+ Printf(":%d", line);
+ if (column > 0)
+ Printf(":%d", column);
+ }
+}
+
+static void PrintModuleAndOffset(const char *module, uptr offset,
+ const char *strip_file_prefix) {
+ Printf(" (%s+0x%zx)", StripPathPrefix(module, strip_file_prefix), offset);
+}
+
+void StackTrace::PrintStack(const uptr *addr, uptr size,
+ bool symbolize, const char *strip_file_prefix,
+ SymbolizeCallback symbolize_callback ) {
+ MemoryMappingLayout proc_maps;
+ InternalScopedBuffer<char> buff(GetPageSizeCached() * 2);
+ InternalScopedBuffer<AddressInfo> addr_frames(64);
+ uptr frame_num = 0;
+ for (uptr i = 0; i < size && addr[i]; i++) {
+ // PCs in stack traces are actually the return addresses, that is,
+ // addresses of the next instructions after the call.
+ uptr pc = GetPreviousInstructionPc(addr[i]);
+ uptr addr_frames_num = 0; // The number of stack frames for current
+ // instruction address.
+ if (symbolize_callback) {
+ if (symbolize_callback((void*)pc, buff.data(), buff.size())) {
+ addr_frames_num = 1;
+ PrintStackFramePrefix(frame_num, pc);
+ // We can't know anything about the string returned by external
+ // symbolizer, but if it starts with filename, try to strip path prefix
+ // from it.
+ Printf(" %s\n", StripPathPrefix(buff.data(), strip_file_prefix));
+ frame_num++;
+ }
+ }
+ if (symbolize && addr_frames_num == 0) {
+ // Use our own (online) symbolizer, if necessary.
+ addr_frames_num = SymbolizeCode(pc, addr_frames.data(),
+ addr_frames.size());
+ for (uptr j = 0; j < addr_frames_num; j++) {
+ AddressInfo &info = addr_frames[j];
+ PrintStackFramePrefix(frame_num, pc);
+ if (info.function) {
+ Printf(" in %s", info.function);
+ }
+ if (info.file) {
+ PrintSourceLocation(info.file, info.line, info.column,
+ strip_file_prefix);
+ } else if (info.module) {
+ PrintModuleAndOffset(info.module, info.module_offset,
+ strip_file_prefix);
+ }
+ Printf("\n");
+ info.Clear();
+ frame_num++;
+ }
+ }
+ if (addr_frames_num == 0) {
+ // If online symbolization failed, try to output at least module and
+ // offset for instruction.
+ PrintStackFramePrefix(frame_num, pc);
+ uptr offset;
+ if (proc_maps.GetObjectNameAndOffset(pc, &offset,
+ buff.data(), buff.size())) {
+ PrintModuleAndOffset(buff.data(), offset, strip_file_prefix);
+ }
+ Printf("\n");
+ frame_num++;
+ }
+ }
+}
+
+uptr StackTrace::GetCurrentPc() {
+ return GET_CALLER_PC();
+}
+
+void StackTrace::FastUnwindStack(uptr pc, uptr bp,
+ uptr stack_top, uptr stack_bottom) {
+ CHECK(size == 0 && trace[0] == pc);
+ size = 1;
+ uhwptr *frame = (uhwptr *)bp;
+ uhwptr *prev_frame = frame;
+ while (frame >= prev_frame &&
+ frame < (uhwptr *)stack_top - 2 &&
+ frame > (uhwptr *)stack_bottom &&
+ size < max_size) {
+ uhwptr pc1 = frame[1];
+ if (pc1 != pc) {
+ trace[size++] = (uptr) pc1;
+ }
+ prev_frame = frame;
+ frame = (uhwptr *)frame[0];
+ }
+}
+
+void StackTrace::PopStackFrames(uptr count) {
+ CHECK(size >= count);
+ size -= count;
+ for (uptr i = 0; i < size; i++) {
+ trace[i] = trace[i + count];
+ }
+}
+
+// On 32-bits we don't compress stack traces.
+// On 64-bits we compress stack traces: if a given pc differes slightly from
+// the previous one, we record a 31-bit offset instead of the full pc.
+SANITIZER_INTERFACE_ATTRIBUTE
+uptr StackTrace::CompressStack(StackTrace *stack, u32 *compressed, uptr size) {
+#if SANITIZER_WORDSIZE == 32
+ // Don't compress, just copy.
+ uptr res = 0;
+ for (uptr i = 0; i < stack->size && i < size; i++) {
+ compressed[i] = stack->trace[i];
+ res++;
+ }
+ if (stack->size < size)
+ compressed[stack->size] = 0;
+#else // 64 bits, compress.
+ uptr prev_pc = 0;
+ const uptr kMaxOffset = (1ULL << 30) - 1;
+ uptr c_index = 0;
+ uptr res = 0;
+ for (uptr i = 0, n = stack->size; i < n; i++) {
+ uptr pc = stack->trace[i];
+ if (!pc) break;
+ if ((s64)pc < 0) break;
+ // Printf("C pc[%zu] %zx\n", i, pc);
+ if (prev_pc - pc < kMaxOffset || pc - prev_pc < kMaxOffset) {
+ uptr offset = (s64)(pc - prev_pc);
+ offset |= (1U << 31);
+ if (c_index >= size) break;
+ // Printf("C co[%zu] offset %zx\n", i, offset);
+ compressed[c_index++] = offset;
+ } else {
+ uptr hi = pc >> 32;
+ uptr lo = (pc << 32) >> 32;
+ CHECK_EQ((hi & (1 << 31)), 0);
+ if (c_index + 1 >= size) break;
+ // Printf("C co[%zu] hi/lo: %zx %zx\n", c_index, hi, lo);
+ compressed[c_index++] = hi;
+ compressed[c_index++] = lo;
+ }
+ res++;
+ prev_pc = pc;
+ }
+ if (c_index < size)
+ compressed[c_index] = 0;
+ if (c_index + 1 < size)
+ compressed[c_index + 1] = 0;
+#endif // SANITIZER_WORDSIZE
+
+ // debug-only code
+#if 0
+ StackTrace check_stack;
+ UncompressStack(&check_stack, compressed, size);
+ if (res < check_stack.size) {
+ Printf("res %zu check_stack.size %zu; c_size %zu\n", res,
+ check_stack.size, size);
+ }
+ // |res| may be greater than check_stack.size, because
+ // UncompressStack(CompressStack(stack)) eliminates the 0x0 frames.
+ CHECK(res >= check_stack.size);
+ CHECK_EQ(0, REAL(memcmp)(check_stack.trace, stack->trace,
+ check_stack.size * sizeof(uptr)));
+#endif
+
+ return res;
+}
+
+SANITIZER_INTERFACE_ATTRIBUTE
+void StackTrace::UncompressStack(StackTrace *stack,
+ u32 *compressed, uptr size) {
+#if SANITIZER_WORDSIZE == 32
+ // Don't uncompress, just copy.
+ stack->size = 0;
+ for (uptr i = 0; i < size && i < kStackTraceMax; i++) {
+ if (!compressed[i]) break;
+ stack->size++;
+ stack->trace[i] = compressed[i];
+ }
+#else // 64 bits, uncompress
+ uptr prev_pc = 0;
+ stack->size = 0;
+ for (uptr i = 0; i < size && stack->size < kStackTraceMax; i++) {
+ u32 x = compressed[i];
+ uptr pc = 0;
+ if (x & (1U << 31)) {
+ // Printf("U co[%zu] offset: %x\n", i, x);
+ // this is an offset
+ s32 offset = x;
+ offset = (offset << 1) >> 1; // remove the 31-byte and sign-extend.
+ pc = prev_pc + offset;
+ CHECK(pc);
+ } else {
+ // CHECK(i + 1 < size);
+ if (i + 1 >= size) break;
+ uptr hi = x;
+ uptr lo = compressed[i+1];
+ // Printf("U co[%zu] hi/lo: %zx %zx\n", i, hi, lo);
+ i++;
+ pc = (hi << 32) | lo;
+ if (!pc) break;
+ }
+ // Printf("U pc[%zu] %zx\n", stack->size, pc);
+ stack->trace[stack->size++] = pc;
+ prev_pc = pc;
+ }
+#endif // SANITIZER_WORDSIZE
+}
+
+} // namespace __sanitizer