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enabled neverZero feature again

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hexcoder- 2019-11-12 23:12:14 +01:00
parent d51719fbd9
commit 7f017aa724
1 changed files with 5 additions and 9 deletions
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14
gcc_plugin/afl-gcc-rt.o.c
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@ -9,8 +9,6 @@
GCC integration design is based on the LLVM design, which comes
from Laszlo Szekeres.
Copyright 2015 Google Inc. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at:
@ -55,15 +53,13 @@ __thread u32 __afl_prev_loc;
#endif
/* Trace a basic block with some ID */
void __afl_trace(u32 x) {
void __afl_trace(const u32 x) {
u32 l = __afl_prev_loc;
#if 0 /* enable for neverZero feature. By default disabled since too inefficient :-( */
/* @Marc: avoid conditional jumps here */
__afl_area_ptr[l ^ x] += 1 + (__afl_area_ptr[l ^ x] == (u8)~0);
#if 1 /* enable for neverZero feature. */
__afl_area_ptr[__afl_prev_loc ^ x] += 1
+ ((u8)(1 + __afl_area_ptr[__afl_prev_loc ^ x]) == 0);
#else
++__afl_area_ptr[l ^ x];
++__afl_area_ptr[__afl_prev_loc ^ x];
#endif
__afl_prev_loc = (x >> 1);