74 lines · cpp
1//===-- nsan_suppressions.cc ----------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "nsan_suppressions.h"10#include "nsan_flags.h"11#include "sanitizer_common/sanitizer_placement_new.h"12#include "sanitizer_common/sanitizer_stacktrace.h"13#include "sanitizer_common/sanitizer_symbolizer.h"14 15using namespace __sanitizer;16using namespace __nsan;17 18SANITIZER_INTERFACE_WEAK_DEF(const char *, __nsan_default_suppressions, void) {19 return 0;20}21 22const char kSuppressionFcmp[] = "fcmp";23const char kSuppressionConsistency[] = "consistency";24 25alignas(64) static char suppression_placeholder[sizeof(SuppressionContext)];26static SuppressionContext *suppression_ctx;27 28// The order should match the enum CheckKind.29static const char *kSuppressionTypes[] = {kSuppressionFcmp,30 kSuppressionConsistency};31 32void __nsan::InitializeSuppressions() {33 CHECK_EQ(nullptr, suppression_ctx);34 suppression_ctx = new (suppression_placeholder)35 SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes));36 suppression_ctx->ParseFromFile(flags().suppressions);37 suppression_ctx->Parse(__nsan_default_suppressions());38}39 40static Suppression *GetSuppressionForAddr(uptr addr, const char *suppr_type) {41 Suppression *s = nullptr;42 43 // Suppress by module name.44 SuppressionContext *suppressions = suppression_ctx;45 if (const char *moduleName =46 Symbolizer::GetOrInit()->GetModuleNameForPc(addr)) {47 if (suppressions->Match(moduleName, suppr_type, &s))48 return s;49 }50 51 // Suppress by file or function name.52 SymbolizedStack *frames = Symbolizer::GetOrInit()->SymbolizePC(addr);53 for (SymbolizedStack *cur = frames; cur; cur = cur->next) {54 if (suppressions->Match(cur->info.function, suppr_type, &s) ||55 suppressions->Match(cur->info.file, suppr_type, &s)) {56 break;57 }58 }59 frames->ClearAll();60 return s;61}62 63Suppression *__nsan::GetSuppressionForStack(const StackTrace *stack,64 CheckKind k) {65 for (uptr i = 0, e = stack->size; i < e; i++) {66 Suppression *s = GetSuppressionForAddr(67 StackTrace::GetPreviousInstructionPc(stack->trace[i]),68 kSuppressionTypes[static_cast<int>(k)]);69 if (s)70 return s;71 }72 return nullptr;73}74