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| /*===- DataFlowCallbacks.cpp - a standalone DataFlow trace -------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Instrumentation callbacks for DataFlow.cpp.
// These functions should not be instrumented by DFSan, so we
// keep them in a separate file and compile it w/o DFSan.
//===----------------------------------------------------------------------===*/
#include "DataFlow.h"
#include <cassert>
#include <cstdio>
#include <cstdlib>
static __thread size_t CurrentFunc;
static uint32_t *GuardsBeg, *GuardsEnd;
static inline bool BlockIsEntry(size_t BlockIdx) {
return __dft.PCsBeg[BlockIdx * 2 + 1] & PCFLAG_FUNC_ENTRY;
}
extern "C" {
void __sanitizer_cov_trace_pc_guard_init(uint32_t *start,
uint32_t *stop) {
assert(__dft.NumFuncs == 0 && "This tool does not support DSOs");
assert(start < stop && "The code is not instrumented for coverage");
if (start == stop || *start) return; // Initialize only once.
GuardsBeg = start;
GuardsEnd = stop;
}
void __sanitizer_cov_pcs_init(const uintptr_t *pcs_beg,
const uintptr_t *pcs_end) {
if (__dft.NumGuards) return; // Initialize only once.
__dft.NumGuards = GuardsEnd - GuardsBeg;
__dft.PCsBeg = pcs_beg;
__dft.PCsEnd = pcs_end;
assert(__dft.NumGuards == (__dft.PCsEnd - __dft.PCsBeg) / 2);
for (size_t i = 0; i < __dft.NumGuards; i++) {
if (BlockIsEntry(i)) {
__dft.NumFuncs++;
GuardsBeg[i] = __dft.NumFuncs;
}
}
__dft.BBExecuted = (bool*)calloc(__dft.NumGuards, sizeof(bool));
fprintf(stderr, "INFO: %zd instrumented function(s) observed "
"and %zd basic blocks\n", __dft.NumFuncs, __dft.NumGuards);
}
void __sanitizer_cov_trace_pc_indir(uint64_t x){} // unused.
void __sanitizer_cov_trace_pc_guard(uint32_t *guard) {
size_t GuardIdx = guard - GuardsBeg;
// assert(GuardIdx < __dft.NumGuards);
__dft.BBExecuted[GuardIdx] = true;
if (!*guard) return; // not a function entry.
uint32_t FuncNum = *guard - 1; // Guards start from 1.
// assert(FuncNum < __dft.NumFuncs);
CurrentFunc = FuncNum;
}
void __dfsw___sanitizer_cov_trace_switch(uint64_t Val, uint64_t *Cases,
dfsan_label L1, dfsan_label UnusedL) {
assert(CurrentFunc < __dft.NumFuncs);
__dft.FuncLabels[CurrentFunc] |= L1;
}
#define HOOK(Name, Type) \
void Name(Type Arg1, Type Arg2, dfsan_label L1, dfsan_label L2) { \
__dft.FuncLabels[CurrentFunc] |= L1 | L2; \
}
//assert(CurrentFunc < __dft.NumFuncs);
HOOK(__dfsw___sanitizer_cov_trace_const_cmp1, uint8_t)
HOOK(__dfsw___sanitizer_cov_trace_const_cmp2, uint16_t)
HOOK(__dfsw___sanitizer_cov_trace_const_cmp4, uint32_t)
HOOK(__dfsw___sanitizer_cov_trace_const_cmp8, uint64_t)
HOOK(__dfsw___sanitizer_cov_trace_cmp1, uint8_t)
HOOK(__dfsw___sanitizer_cov_trace_cmp2, uint16_t)
HOOK(__dfsw___sanitizer_cov_trace_cmp4, uint32_t)
HOOK(__dfsw___sanitizer_cov_trace_cmp8, uint64_t)
} // extern "C"
|