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asan_suppressions.cpp 
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//===-- asan_suppressions.cpp ---------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// Issue suppression and suppression-related functions.
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//===----------------------------------------------------------------------===//
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#include "asan_suppressions.h"
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#include "asan_stack.h"
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#include "sanitizer_common/sanitizer_placement_new.h"
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#include "sanitizer_common/sanitizer_suppressions.h"
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#include "sanitizer_common/sanitizer_symbolizer.h"
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namespace __asan {
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ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)];
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static SuppressionContext *suppression_ctx = nullptr;
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static const char kInterceptorName[] = "interceptor_name";
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static const char kInterceptorViaFunction[] = "interceptor_via_fun";
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static const char kInterceptorViaLibrary[] = "interceptor_via_lib";
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static const char kODRViolation[] = "odr_violation";
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static const char *kSuppressionTypes[] = {
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    kInterceptorName, kInterceptorViaFunction, kInterceptorViaLibrary,
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    kODRViolation};
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SANITIZER_INTERFACE_WEAK_DEF(const char *, __asan_default_suppressions, void) {
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  return "";
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}
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void InitializeSuppressions() {
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  CHECK_EQ(nullptr, suppression_ctx);
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  suppression_ctx = new (suppression_placeholder)
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      SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes));
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  suppression_ctx->ParseFromFile(flags()->suppressions);
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  suppression_ctx->Parse(__asan_default_suppressions());
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}
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bool IsInterceptorSuppressed(const char *interceptor_name) {
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  CHECK(suppression_ctx);
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  Suppression *s;
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  // Match "interceptor_name" suppressions.
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  return suppression_ctx->Match(interceptor_name, kInterceptorName, &s);
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}
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bool HaveStackTraceBasedSuppressions() {
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  CHECK(suppression_ctx);
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  return suppression_ctx->HasSuppressionType(kInterceptorViaFunction) ||
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         suppression_ctx->HasSuppressionType(kInterceptorViaLibrary);
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}
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bool IsODRViolationSuppressed(const char *global_var_name) {
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  CHECK(suppression_ctx);
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  Suppression *s;
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  // Match "odr_violation" suppressions.
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  return suppression_ctx->Match(global_var_name, kODRViolation, &s);
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}
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bool IsStackTraceSuppressed(const StackTrace *stack) {
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  if (!HaveStackTraceBasedSuppressions())
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    return false;
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  CHECK(suppression_ctx);
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  Symbolizer *symbolizer = Symbolizer::GetOrInit();
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  Suppression *s;
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  for (uptr i = 0; i < stack->size && stack->trace[i]; i++) {
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    uptr addr = stack->trace[i];
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    if (suppression_ctx->HasSuppressionType(kInterceptorViaLibrary)) {
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      // Match "interceptor_via_lib" suppressions.
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      if (const char *module_name = symbolizer->GetModuleNameForPc(addr))
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        if (suppression_ctx->Match(module_name, kInterceptorViaLibrary, &s))
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          return true;
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    }
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    if (suppression_ctx->HasSuppressionType(kInterceptorViaFunction)) {
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      SymbolizedStackHolder symbolized_stack(symbolizer->SymbolizePC(addr));
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      const SymbolizedStack *frames = symbolized_stack.get();
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      CHECK(frames);
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      for (const SymbolizedStack *cur = frames; cur; cur = cur->next) {
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        const char *function_name = cur->info.function;
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        if (!function_name) {
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          continue;
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        }
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        // Match "interceptor_via_fun" suppressions.
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        if (suppression_ctx->Match(function_name, kInterceptorViaFunction,
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                                   &s)) {
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          return true;
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        }
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      }
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    }
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  }
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  return false;
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}
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} // namespace __asan
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