[ASan] Kill use_stack_depot runtime flag and stack trace compression routines.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@193868 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 0 insertions, 110 deletions

diff --git a/lib/sanitizer_common/sanitizer_stacktrace.cc b/lib/sanitizer_common/sanitizer_stacktrace.cc
index d01e26b0..a110774e 100644
--- a/lib/sanitizer_common/sanitizer_stacktrace.cc
+++ b/lib/sanitizer_common/sanitizer_stacktrace.cc
@@ -147,109 +147,4 @@ 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.
-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;
-}
-
-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
diff --git a/lib/sanitizer_common/sanitizer_stacktrace.h b/lib/sanitizer_common/sanitizer_stacktrace.h
index 8c55397f..7c6a25cc 100644
--- a/lib/sanitizer_common/sanitizer_stacktrace.h
+++ b/lib/sanitizer_common/sanitizer_stacktrace.h
@@ -56,11 +56,6 @@ struct StackTrace {
 
   static uptr GetCurrentPc();
   static uptr GetPreviousInstructionPc(uptr pc);
-
-  static uptr CompressStack(StackTrace *stack,
-                            u32 *compressed, uptr size);
-  static void UncompressStack(StackTrace *stack,
-                              u32 *compressed, uptr size);
 };
 
 }  // namespace __sanitizer