Old

#include "gwp_asan/guarded_pool_allocator.h"

gwp_asan::GuardedPoolAllocator *GPA;
extern "C" bool AsmDumpHelperFunc() {
  return GPA->shouldSample();
}
=======================================================================================
  // Return whether the allocation should be randomly chosen for sampling.
  ALWAYS_INLINE bool shouldSample() {
    // NextSampleCounter == 0 means we "should regenerate the counter".
    //                   == 1 means we "should sample this allocation".
    if (UNLIKELY(NextSampleCounter == 0)) {
      // GuardedPagePool != 0 if GWP-ASan is enabled.
      if (UNLIKELY(GuardedPagePool == 0))
        return false;
      NextSampleCounter =
          (random::getRandomUnsigned64() % AdjustedSampleRate) + 1;
    }

    return UNLIKELY(NextSampleCounter-- == 1);
  }
=======================================================================================
0000000000000000 <AsmDumpHelperFunc>:
AsmDumpHelperFunc():
/usr/local/google/home/mitchp/llvm/compiler-rt/lib/gwp_asan/shouldsample_donotsubmit.cpp:4
#include "gwp_asan/guarded_pool_allocator.h"

gwp_asan::GuardedPoolAllocator GPA;
extern "C" bool AsmDumpHelperFunc() {
   0:	41 56                	push   %r14
   2:	53                   	push   %rbx
   3:	50                   	push   %rax
/usr/local/google/home/mitchp/llvm/compiler-rt/lib/gwp_asan/../gwp_asan/guarded_pool_allocator.h:100

  // Return whether the allocation should be randomly chosen for sampling.
  ALWAYS_INLINE bool shouldSample() {
    // NextSampleCounter == 0 means we "should regenerate the counter".
    //                   == 1 means we "should sample this allocation".
    if (UNLIKELY(NextSampleCounter == 0)) {
   4:	48 83 3d 00 00 00 00 	cmpq   $0x0,0x0(%rip)        # c <AsmDumpHelperFunc+0xc>
   b:	00
   c:	74 05                	je     13 <AsmDumpHelperFunc+0x13>
   e:	e8 00 00 00 00       	callq  13 <AsmDumpHelperFunc+0x13>
  13:	4c 8b 35 00 00 00 00 	mov    0x0(%rip),%r14        # 1a <AsmDumpHelperFunc+0x1a>
  1a:	64 49 8b 1e          	mov    %fs:(%r14),%rbx
  1e:	48 85 db             	test   %rbx,%rbx
  21:	74 2a                	je     4d <AsmDumpHelperFunc+0x4d>
/usr/local/google/home/mitchp/llvm/compiler-rt/lib/gwp_asan/../gwp_asan/guarded_pool_allocator.h:108
        return false;
      NextSampleCounter =
          (random::getRandomUnsigned64() % AdjustedSampleRate) + 1;
    }

    return UNLIKELY(NextSampleCounter-- == 1);
  23:	48 83 3d 00 00 00 00 	cmpq   $0x0,0x0(%rip)        # 2b <AsmDumpHelperFunc+0x2b>
  2a:	00
  2b:	74 09                	je     36 <AsmDumpHelperFunc+0x36>
  2d:	e8 00 00 00 00       	callq  32 <AsmDumpHelperFunc+0x32>
  32:	64 49 8b 1e          	mov    %fs:(%r14),%rbx
  36:	48 8d 43 ff          	lea    -0x1(%rbx),%rax
  3a:	64 49 89 06          	mov    %rax,%fs:(%r14)
  3e:	48 83 fb 01          	cmp    $0x1,%rbx
  42:	0f 94 c0             	sete   %al
/usr/local/google/home/mitchp/llvm/compiler-rt/lib/gwp_asan/shouldsample_donotsubmit.cpp:5
  return GPA.shouldSample();
  45:	48 83 c4 08          	add    $0x8,%rsp
  49:	5b                   	pop    %rbx
  4a:	41 5e                	pop    %r14
  4c:	c3                   	retq
/usr/local/google/home/mitchp/llvm/compiler-rt/lib/gwp_asan/../gwp_asan/guarded_pool_allocator.h:102
      if (UNLIKELY(GuardedPagePool == 0))
  4d:	48 8b 1d 00 00 00 00 	mov    0x0(%rip),%rbx        # 54 <AsmDumpHelperFunc+0x54>
  54:	48 83 7b 20 00       	cmpq   $0x0,0x20(%rbx)
  59:	74 31                	je     8c <AsmDumpHelperFunc+0x8c>
/usr/local/google/home/mitchp/llvm/compiler-rt/lib/gwp_asan/../gwp_asan/guarded_pool_allocator.h:105
          (random::getRandomUnsigned64() % AdjustedSampleRate) + 1;
  5b:	e8 00 00 00 00       	callq  60 <AsmDumpHelperFunc+0x60>
  60:	31 d2                	xor    %edx,%edx
  62:	48 f7 73 58          	divq   0x58(%rbx)
  66:	48 89 d3             	mov    %rdx,%rbx
  69:	48 83 c3 01          	add    $0x1,%rbx
/usr/local/google/home/mitchp/llvm/compiler-rt/lib/gwp_asan/../gwp_asan/guarded_pool_allocator.h:104
      NextSampleCounter =
  6d:	48 83 3d 00 00 00 00 	cmpq   $0x0,0x0(%rip)        # 75 <AsmDumpHelperFunc+0x75>
  74:	00
  75:	74 05                	je     7c <AsmDumpHelperFunc+0x7c>
  77:	e8 00 00 00 00       	callq  7c <AsmDumpHelperFunc+0x7c>
  7c:	64 49 89 1e          	mov    %rbx,%fs:(%r14)
/usr/local/google/home/mitchp/llvm/compiler-rt/lib/gwp_asan/../gwp_asan/guarded_pool_allocator.h:108
    return UNLIKELY(NextSampleCounter-- == 1);
  80:	48 83 3d 00 00 00 00 	cmpq   $0x0,0x0(%rip)        # 88 <AsmDumpHelperFunc+0x88>
  87:	00
  88:	75 a3                	jne    2d <AsmDumpHelperFunc+0x2d>
  8a:	eb aa                	jmp    36 <AsmDumpHelperFunc+0x36>
  8c:	31 c0                	xor    %eax,%eax
  8e:	eb b5                	jmp    45 <AsmDumpHelperFunc+0x45>