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authorDimitry Andric <dim@FreeBSD.org>2014-11-06 22:49:13 +0000
committerDimitry Andric <dim@FreeBSD.org>2014-11-06 22:49:13 +0000
commit8ef50bf3d1c287b5013c3168de77a462dfce3495 (patch)
tree3467f3372c1195b1546172d89af2205a50b1866d /lib/sanitizer_common/sanitizer_stacktrace.cc
parent11023dc647fd8f41418da90d59db138400d0f334 (diff)
downloadsrc-8ef50bf3d1c287b5013c3168de77a462dfce3495.tar.gz
src-8ef50bf3d1c287b5013c3168de77a462dfce3495.zip
Import compiler-rt release_34 branch r197381.vendor/compiler-rt/compiler-rt-r197381
Notes
Notes: svn path=/vendor/compiler-rt/dist/; revision=274201 svn path=/vendor/compiler-rt/compiler-rt-r197381/; revision=274202; tag=vendor/compiler-rt/compiler-rt-r197381
Diffstat (limited to 'lib/sanitizer_common/sanitizer_stacktrace.cc')
-rw-r--r--lib/sanitizer_common/sanitizer_stacktrace.cc204
1 files changed, 55 insertions, 149 deletions
diff --git a/lib/sanitizer_common/sanitizer_stacktrace.cc b/lib/sanitizer_common/sanitizer_stacktrace.cc
index 724c29c86b66..70ce26bde0d2 100644
--- a/lib/sanitizer_common/sanitizer_stacktrace.cc
+++ b/lib/sanitizer_common/sanitizer_stacktrace.cc
@@ -12,20 +12,13 @@
//===----------------------------------------------------------------------===//
#include "sanitizer_common.h"
+#include "sanitizer_flags.h"
#include "sanitizer_procmaps.h"
#include "sanitizer_stacktrace.h"
#include "sanitizer_symbolizer.h"
namespace __sanitizer {
-const char *StripPathPrefix(const char *filepath,
- const char *strip_file_prefix) {
- if (filepath == 0) return 0;
- 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.
@@ -41,32 +34,21 @@ uptr StackTrace::GetPreviousInstructionPc(uptr pc) {
#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);
+static void PrintStackFramePrefix(InternalScopedString *buffer, uptr frame_num,
+ uptr pc) {
+ buffer->append(" #%zu 0x%zx", frame_num, pc);
}
void StackTrace::PrintStack(const uptr *addr, uptr size,
- bool symbolize, const char *strip_file_prefix,
- SymbolizeCallback symbolize_callback ) {
+ SymbolizeCallback symbolize_callback) {
+ if (addr == 0) {
+ Printf("<empty stack>\n\n");
+ return;
+ }
MemoryMappingLayout proc_maps(/*cache_enabled*/true);
InternalScopedBuffer<char> buff(GetPageSizeCached() * 2);
InternalScopedBuffer<AddressInfo> addr_frames(64);
+ InternalScopedString frame_desc(GetPageSizeCached() * 2);
uptr frame_num = 0;
for (uptr i = 0; i < size && addr[i]; i++) {
// PCs in stack traces are actually the return addresses, that is,
@@ -77,50 +59,60 @@ void StackTrace::PrintStack(const uptr *addr, uptr size,
if (symbolize_callback) {
if (symbolize_callback((void*)pc, buff.data(), buff.size())) {
addr_frames_num = 1;
- PrintStackFramePrefix(frame_num, pc);
+ frame_desc.clear();
+ PrintStackFramePrefix(&frame_desc, 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_desc.append(
+ " %s",
+ StripPathPrefix(buff.data(), common_flags()->strip_path_prefix));
+ Printf("%s\n", frame_desc.data());
frame_num++;
}
}
- if (symbolize && addr_frames_num == 0 && &SymbolizeCode) {
+ if (common_flags()->symbolize && addr_frames_num == 0) {
// Use our own (online) symbolizer, if necessary.
- addr_frames_num = SymbolizeCode(pc, addr_frames.data(),
- addr_frames.size());
+ if (Symbolizer *sym = Symbolizer::GetOrNull())
+ addr_frames_num =
+ sym->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);
+ frame_desc.clear();
+ PrintStackFramePrefix(&frame_desc, frame_num, pc);
if (info.function) {
- Printf(" in %s", info.function);
+ frame_desc.append(" in %s", info.function);
}
if (info.file) {
- PrintSourceLocation(info.file, info.line, info.column,
- strip_file_prefix);
+ frame_desc.append(" ");
+ PrintSourceLocation(&frame_desc, info.file, info.line, info.column);
} else if (info.module) {
- PrintModuleAndOffset(info.module, info.module_offset,
- strip_file_prefix);
+ frame_desc.append(" ");
+ PrintModuleAndOffset(&frame_desc, info.module, info.module_offset);
}
- Printf("\n");
- info.Clear();
+ Printf("%s\n", frame_desc.data());
frame_num++;
+ info.Clear();
}
}
if (addr_frames_num == 0) {
// If online symbolization failed, try to output at least module and
// offset for instruction.
- PrintStackFramePrefix(frame_num, pc);
+ frame_desc.clear();
+ PrintStackFramePrefix(&frame_desc, frame_num, pc);
uptr offset;
if (proc_maps.GetObjectNameAndOffset(pc, &offset,
buff.data(), buff.size(),
/* protection */0)) {
- PrintModuleAndOffset(buff.data(), offset, strip_file_prefix);
+ frame_desc.append(" ");
+ PrintModuleAndOffset(&frame_desc, buff.data(), offset);
}
- Printf("\n");
+ Printf("%s\n", frame_desc.data());
frame_num++;
}
}
+ // Always print a trailing empty line after stack trace.
+ Printf("\n");
}
uptr StackTrace::GetCurrentPc() {
@@ -128,17 +120,23 @@ uptr StackTrace::GetCurrentPc() {
}
void StackTrace::FastUnwindStack(uptr pc, uptr bp,
- uptr stack_top, uptr stack_bottom) {
- CHECK(size == 0 && trace[0] == pc);
+ uptr stack_top, uptr stack_bottom,
+ uptr max_depth) {
+ if (max_depth == 0) {
+ size = 0;
+ return;
+ }
+ trace[0] = pc;
size = 1;
uhwptr *frame = (uhwptr *)bp;
uhwptr *prev_frame = frame - 1;
+ if (stack_top < 4096) return; // Sanity check for stack top.
// Avoid infinite loop when frame == frame[0] by using frame > prev_frame.
while (frame > prev_frame &&
frame < (uhwptr *)stack_top - 2 &&
frame > (uhwptr *)stack_bottom &&
IsAligned((uptr)frame, sizeof(*frame)) &&
- size < max_size) {
+ size < max_depth) {
uhwptr pc1 = frame[1];
if (pc1 != pc) {
trace[size++] = (uptr) pc1;
@@ -156,111 +154,19 @@ void StackTrace::PopStackFrames(uptr 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;
+static bool MatchPc(uptr cur_pc, uptr trace_pc, uptr threshold) {
+ return cur_pc - trace_pc <= threshold || trace_pc - cur_pc <= threshold;
}
-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;
+uptr StackTrace::LocatePcInTrace(uptr pc) {
+ // Use threshold to find PC in stack trace, as PC we want to unwind from may
+ // slightly differ from return address in the actual unwinded stack trace.
+ const int kPcThreshold = 96;
+ for (uptr i = 0; i < size; ++i) {
+ if (MatchPc(pc, trace[i], kPcThreshold))
+ return i;
}
-#endif // SANITIZER_WORDSIZE
+ return 0;
}
} // namespace __sanitizer