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afd170bdd9
This removes and replaces usage of a few LowLevelAllocators with a single one provided by sanitizer_common. Functionally, there should be no difference between using different allocators vs the same one. This works really well with D158783 which controls the size of each allocator mmap to significantly reduce fragmentation. This doesn't remove them all, mainly the ones used by asan and the flag parser. Differential Revision: https://reviews.llvm.org/D158786
140 lines
4.2 KiB
C++
140 lines
4.2 KiB
C++
//===-- sanitizer_flags.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 ThreadSanitizer/AddressSanitizer runtime.
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//
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//===----------------------------------------------------------------------===//
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#include "sanitizer_flags.h"
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#include "sanitizer_common.h"
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#include "sanitizer_flag_parser.h"
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#include "sanitizer_libc.h"
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#include "sanitizer_linux.h"
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#include "sanitizer_list.h"
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namespace __sanitizer {
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CommonFlags common_flags_dont_use;
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void CommonFlags::SetDefaults() {
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#define COMMON_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
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#include "sanitizer_flags.inc"
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#undef COMMON_FLAG
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}
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void CommonFlags::CopyFrom(const CommonFlags &other) {
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internal_memcpy(this, &other, sizeof(*this));
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}
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// Copy the string from "s" to "out", making the following substitutions:
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// %b = binary basename
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// %p = pid
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// %d = binary directory
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void SubstituteForFlagValue(const char *s, char *out, uptr out_size) {
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char *out_end = out + out_size;
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while (*s && out < out_end - 1) {
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if (s[0] != '%') {
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*out++ = *s++;
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continue;
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}
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switch (s[1]) {
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case 'b': {
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const char *base = GetProcessName();
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CHECK(base);
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while (*base && out < out_end - 1)
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*out++ = *base++;
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s += 2; // skip "%b"
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break;
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}
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case 'p': {
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int pid = internal_getpid();
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char buf[32];
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char *buf_pos = buf + 32;
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do {
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*--buf_pos = (pid % 10) + '0';
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pid /= 10;
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} while (pid);
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while (buf_pos < buf + 32 && out < out_end - 1)
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*out++ = *buf_pos++;
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s += 2; // skip "%p"
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break;
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}
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case 'd': {
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uptr len = ReadBinaryDir(out, out_end - out);
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out += len;
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s += 2; // skip "%d"
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break;
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}
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default:
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*out++ = *s++;
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break;
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}
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}
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CHECK(out < out_end - 1);
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*out = '\0';
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}
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class FlagHandlerInclude final : public FlagHandlerBase {
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FlagParser *parser_;
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bool ignore_missing_;
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const char *original_path_;
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public:
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explicit FlagHandlerInclude(FlagParser *parser, bool ignore_missing)
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: parser_(parser), ignore_missing_(ignore_missing), original_path_("") {}
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bool Parse(const char *value) final {
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original_path_ = value;
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if (internal_strchr(value, '%')) {
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char *buf = (char *)MmapOrDie(kMaxPathLength, "FlagHandlerInclude");
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SubstituteForFlagValue(value, buf, kMaxPathLength);
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bool res = parser_->ParseFile(buf, ignore_missing_);
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UnmapOrDie(buf, kMaxPathLength);
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return res;
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}
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return parser_->ParseFile(value, ignore_missing_);
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}
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bool Format(char *buffer, uptr size) override {
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// Note `original_path_` isn't actually what's parsed due to `%`
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// substitutions. Printing the substituted path would require holding onto
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// mmap'ed memory.
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return FormatString(buffer, size, original_path_);
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}
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};
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void RegisterIncludeFlags(FlagParser *parser, CommonFlags *cf) {
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FlagHandlerInclude *fh_include = new (GetGlobalLowLevelAllocator())
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FlagHandlerInclude(parser, /*ignore_missing*/ false);
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parser->RegisterHandler("include", fh_include,
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"read more options from the given file");
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FlagHandlerInclude *fh_include_if_exists = new (GetGlobalLowLevelAllocator())
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FlagHandlerInclude(parser, /*ignore_missing*/ true);
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parser->RegisterHandler(
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"include_if_exists", fh_include_if_exists,
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"read more options from the given file (if it exists)");
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}
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void RegisterCommonFlags(FlagParser *parser, CommonFlags *cf) {
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#define COMMON_FLAG(Type, Name, DefaultValue, Description) \
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RegisterFlag(parser, #Name, Description, &cf->Name);
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#include "sanitizer_flags.inc"
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#undef COMMON_FLAG
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RegisterIncludeFlags(parser, cf);
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}
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void InitializeCommonFlags(CommonFlags *cf) {
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// need to record coverage to generate coverage report.
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cf->coverage |= cf->html_cov_report;
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SetVerbosity(cf->verbosity);
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InitializePlatformCommonFlags(cf);
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}
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} // namespace __sanitizer
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