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518 lines
18 KiB
C++
518 lines
18 KiB
C++
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// Copyright 2018 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/debugging/symbolize.h"
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#ifndef _WIN32
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#include <fcntl.h>
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#include <sys/mman.h>
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#endif
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#include <cstring>
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#include <iostream>
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#include <memory>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "absl/base/attributes.h"
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#include "absl/base/casts.h"
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#include "absl/base/internal/per_thread_tls.h"
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#include "absl/base/internal/raw_logging.h"
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#include "absl/base/optimization.h"
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#include "absl/debugging/internal/stack_consumption.h"
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#include "absl/memory/memory.h"
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using testing::Contains;
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// Functions to symbolize. Use C linkage to avoid mangled names.
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extern "C" {
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void nonstatic_func() { ABSL_BLOCK_TAIL_CALL_OPTIMIZATION(); }
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static void static_func() { ABSL_BLOCK_TAIL_CALL_OPTIMIZATION(); }
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} // extern "C"
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struct Foo {
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static void func(int x);
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};
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// A C++ method that should have a mangled name.
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void ABSL_ATTRIBUTE_NOINLINE Foo::func(int) {
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ABSL_BLOCK_TAIL_CALL_OPTIMIZATION();
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}
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// Create functions that will remain in different text sections in the
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// final binary when linker option "-z,keep-text-section-prefix" is used.
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int ABSL_ATTRIBUTE_SECTION_VARIABLE(.text.unlikely) unlikely_func() {
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return 0;
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}
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int ABSL_ATTRIBUTE_SECTION_VARIABLE(.text.hot) hot_func() {
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return 0;
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}
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int ABSL_ATTRIBUTE_SECTION_VARIABLE(.text.startup) startup_func() {
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return 0;
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}
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int ABSL_ATTRIBUTE_SECTION_VARIABLE(.text.exit) exit_func() {
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return 0;
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}
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int /*ABSL_ATTRIBUTE_SECTION_VARIABLE(.text)*/ regular_func() {
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return 0;
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}
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// Thread-local data may confuse the symbolizer, ensure that it does not.
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// Variable sizes and order are important.
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#if ABSL_PER_THREAD_TLS
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static ABSL_PER_THREAD_TLS_KEYWORD char symbolize_test_thread_small[1];
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static ABSL_PER_THREAD_TLS_KEYWORD char
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symbolize_test_thread_big[2 * 1024 * 1024];
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#endif
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// Used below to hopefully inhibit some compiler/linker optimizations
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// that may remove kHpageTextPadding, kPadding0, and kPadding1 from
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// the binary.
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static volatile bool volatile_bool = false;
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// Force the binary to be large enough that a THP .text remap will succeed.
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static constexpr size_t kHpageSize = 1 << 21;
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const char kHpageTextPadding[kHpageSize * 4] ABSL_ATTRIBUTE_SECTION_VARIABLE(
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.text) = "";
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static char try_symbolize_buffer[4096];
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// A wrapper function for absl::Symbolize() to make the unit test simple. The
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// limit must be < sizeof(try_symbolize_buffer). Returns null if
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// absl::Symbolize() returns false, otherwise returns try_symbolize_buffer with
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// the result of absl::Symbolize().
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static const char *TrySymbolizeWithLimit(void *pc, int limit) {
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ABSL_RAW_CHECK(limit <= sizeof(try_symbolize_buffer),
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"try_symbolize_buffer is too small");
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// Use the heap to facilitate heap and buffer sanitizer tools.
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auto heap_buffer = absl::make_unique<char[]>(sizeof(try_symbolize_buffer));
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bool found = absl::Symbolize(pc, heap_buffer.get(), limit);
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if (found) {
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ABSL_RAW_CHECK(strnlen(heap_buffer.get(), limit) < limit,
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"absl::Symbolize() did not properly terminate the string");
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strncpy(try_symbolize_buffer, heap_buffer.get(),
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sizeof(try_symbolize_buffer));
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}
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return found ? try_symbolize_buffer : nullptr;
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}
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// A wrapper for TrySymbolizeWithLimit(), with a large limit.
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static const char *TrySymbolize(void *pc) {
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return TrySymbolizeWithLimit(pc, sizeof(try_symbolize_buffer));
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}
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#ifdef ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE
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TEST(Symbolize, Cached) {
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// Compilers should give us pointers to them.
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EXPECT_STREQ("nonstatic_func", TrySymbolize((void *)(&nonstatic_func)));
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// The name of an internal linkage symbol is not specified; allow either a
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// mangled or an unmangled name here.
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const char *static_func_symbol = TrySymbolize((void *)(&static_func));
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EXPECT_TRUE(strcmp("static_func", static_func_symbol) == 0 ||
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strcmp("static_func()", static_func_symbol) == 0);
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EXPECT_TRUE(nullptr == TrySymbolize(nullptr));
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}
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TEST(Symbolize, Truncation) {
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constexpr char kNonStaticFunc[] = "nonstatic_func";
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EXPECT_STREQ("nonstatic_func",
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TrySymbolizeWithLimit((void *)(&nonstatic_func),
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strlen(kNonStaticFunc) + 1));
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EXPECT_STREQ("nonstatic_...",
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TrySymbolizeWithLimit((void *)(&nonstatic_func),
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strlen(kNonStaticFunc) + 0));
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EXPECT_STREQ("nonstatic...",
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TrySymbolizeWithLimit((void *)(&nonstatic_func),
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strlen(kNonStaticFunc) - 1));
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EXPECT_STREQ("n...", TrySymbolizeWithLimit((void *)(&nonstatic_func), 5));
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EXPECT_STREQ("...", TrySymbolizeWithLimit((void *)(&nonstatic_func), 4));
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EXPECT_STREQ("..", TrySymbolizeWithLimit((void *)(&nonstatic_func), 3));
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EXPECT_STREQ(".", TrySymbolizeWithLimit((void *)(&nonstatic_func), 2));
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EXPECT_STREQ("", TrySymbolizeWithLimit((void *)(&nonstatic_func), 1));
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EXPECT_EQ(nullptr, TrySymbolizeWithLimit((void *)(&nonstatic_func), 0));
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}
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TEST(Symbolize, SymbolizeWithDemangling) {
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Foo::func(100);
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EXPECT_STREQ("Foo::func()", TrySymbolize((void *)(&Foo::func)));
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}
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TEST(Symbolize, SymbolizeSplitTextSections) {
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EXPECT_STREQ("unlikely_func()", TrySymbolize((void *)(&unlikely_func)));
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EXPECT_STREQ("hot_func()", TrySymbolize((void *)(&hot_func)));
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EXPECT_STREQ("startup_func()", TrySymbolize((void *)(&startup_func)));
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EXPECT_STREQ("exit_func()", TrySymbolize((void *)(&exit_func)));
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EXPECT_STREQ("regular_func()", TrySymbolize((void *)(®ular_func)));
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}
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// Tests that verify that Symbolize stack footprint is within some limit.
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#ifdef ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION
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static void *g_pc_to_symbolize;
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static char g_symbolize_buffer[4096];
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static char *g_symbolize_result;
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static void SymbolizeSignalHandler(int signo) {
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if (absl::Symbolize(g_pc_to_symbolize, g_symbolize_buffer,
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sizeof(g_symbolize_buffer))) {
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g_symbolize_result = g_symbolize_buffer;
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} else {
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g_symbolize_result = nullptr;
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}
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}
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// Call Symbolize and figure out the stack footprint of this call.
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static const char *SymbolizeStackConsumption(void *pc, int *stack_consumed) {
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g_pc_to_symbolize = pc;
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*stack_consumed = absl::debugging_internal::GetSignalHandlerStackConsumption(
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SymbolizeSignalHandler);
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return g_symbolize_result;
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}
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static int GetStackConsumptionUpperLimit() {
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// Symbolize stack consumption should be within 2kB.
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int stack_consumption_upper_limit = 2048;
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#if defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \
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defined(THREAD_SANITIZER)
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// Account for sanitizer instrumentation requiring additional stack space.
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stack_consumption_upper_limit *= 5;
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#endif
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return stack_consumption_upper_limit;
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}
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TEST(Symbolize, SymbolizeStackConsumption) {
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int stack_consumed = 0;
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const char *symbol =
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SymbolizeStackConsumption((void *)(&nonstatic_func), &stack_consumed);
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EXPECT_STREQ("nonstatic_func", symbol);
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EXPECT_GT(stack_consumed, 0);
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EXPECT_LT(stack_consumed, GetStackConsumptionUpperLimit());
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// The name of an internal linkage symbol is not specified; allow either a
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// mangled or an unmangled name here.
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symbol = SymbolizeStackConsumption((void *)(&static_func), &stack_consumed);
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EXPECT_TRUE(strcmp("static_func", symbol) == 0 ||
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strcmp("static_func()", symbol) == 0);
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EXPECT_GT(stack_consumed, 0);
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EXPECT_LT(stack_consumed, GetStackConsumptionUpperLimit());
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}
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TEST(Symbolize, SymbolizeWithDemanglingStackConsumption) {
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Foo::func(100);
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int stack_consumed = 0;
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const char *symbol =
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SymbolizeStackConsumption((void *)(&Foo::func), &stack_consumed);
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EXPECT_STREQ("Foo::func()", symbol);
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EXPECT_GT(stack_consumed, 0);
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EXPECT_LT(stack_consumed, GetStackConsumptionUpperLimit());
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}
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#endif // ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION
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// Use a 64K page size for PPC.
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const size_t kPageSize = 64 << 10;
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// We place a read-only symbols into the .text section and verify that we can
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// symbolize them and other symbols after remapping them.
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const char kPadding0[kPageSize * 4] ABSL_ATTRIBUTE_SECTION_VARIABLE(.text) =
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"";
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const char kPadding1[kPageSize * 4] ABSL_ATTRIBUTE_SECTION_VARIABLE(.text) =
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"";
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static int FilterElfHeader(struct dl_phdr_info *info, size_t size, void *data) {
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for (int i = 0; i < info->dlpi_phnum; i++) {
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if (info->dlpi_phdr[i].p_type == PT_LOAD &&
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info->dlpi_phdr[i].p_flags == (PF_R | PF_X)) {
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const void *const vaddr =
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absl::bit_cast<void *>(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr);
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const auto segsize = info->dlpi_phdr[i].p_memsz;
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const char *self_exe;
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if (info->dlpi_name != nullptr && info->dlpi_name[0] != '\0') {
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self_exe = info->dlpi_name;
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} else {
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self_exe = "/proc/self/exe";
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}
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absl::debugging_internal::RegisterFileMappingHint(
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vaddr, reinterpret_cast<const char *>(vaddr) + segsize,
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info->dlpi_phdr[i].p_offset, self_exe);
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return 1;
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}
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}
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return 1;
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}
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TEST(Symbolize, SymbolizeWithMultipleMaps) {
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// Force kPadding0 and kPadding1 to be linked in.
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if (volatile_bool) {
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ABSL_RAW_LOG(INFO, "%s", kPadding0);
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ABSL_RAW_LOG(INFO, "%s", kPadding1);
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}
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// Verify we can symbolize everything.
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char buf[512];
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memset(buf, 0, sizeof(buf));
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absl::Symbolize(kPadding0, buf, sizeof(buf));
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EXPECT_STREQ("kPadding0", buf);
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memset(buf, 0, sizeof(buf));
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absl::Symbolize(kPadding1, buf, sizeof(buf));
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EXPECT_STREQ("kPadding1", buf);
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// Specify a hint for the executable segment.
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dl_iterate_phdr(FilterElfHeader, nullptr);
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// Reload at least one page out of kPadding0, kPadding1
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const char *ptrs[] = {kPadding0, kPadding1};
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for (const char *ptr : ptrs) {
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const int kMapFlags = MAP_ANONYMOUS | MAP_PRIVATE;
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void *addr = mmap(nullptr, kPageSize, PROT_READ, kMapFlags, 0, 0);
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ASSERT_NE(addr, MAP_FAILED);
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// kPadding[0-1] is full of zeroes, so we can remap anywhere within it, but
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// we ensure there is at least a full page of padding.
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void *remapped = reinterpret_cast<void *>(
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reinterpret_cast<uintptr_t>(ptr + kPageSize) & ~(kPageSize - 1ULL));
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const int kMremapFlags = (MREMAP_MAYMOVE | MREMAP_FIXED);
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void *ret = mremap(addr, kPageSize, kPageSize, kMremapFlags, remapped);
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ASSERT_NE(ret, MAP_FAILED);
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}
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// Invalidate the symbolization cache so we are forced to rely on the hint.
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absl::Symbolize(nullptr, buf, sizeof(buf));
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// Verify we can still symbolize.
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const char *expected[] = {"kPadding0", "kPadding1"};
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const size_t offsets[] = {0, kPageSize, 2 * kPageSize, 3 * kPageSize};
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for (int i = 0; i < 2; i++) {
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for (size_t offset : offsets) {
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memset(buf, 0, sizeof(buf));
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absl::Symbolize(ptrs[i] + offset, buf, sizeof(buf));
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EXPECT_STREQ(expected[i], buf);
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}
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}
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}
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// Appends string(*args->arg) to args->symbol_buf.
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static void DummySymbolDecorator(
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const absl::debugging_internal::SymbolDecoratorArgs *args) {
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std::string *message = static_cast<std::string *>(args->arg);
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strncat(args->symbol_buf, message->c_str(),
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args->symbol_buf_size - strlen(args->symbol_buf) - 1);
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}
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TEST(Symbolize, InstallAndRemoveSymbolDecorators) {
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int ticket_a;
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std::string a_message("a");
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EXPECT_GE(ticket_a = absl::debugging_internal::InstallSymbolDecorator(
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DummySymbolDecorator, &a_message),
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0);
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int ticket_b;
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std::string b_message("b");
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EXPECT_GE(ticket_b = absl::debugging_internal::InstallSymbolDecorator(
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DummySymbolDecorator, &b_message),
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0);
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int ticket_c;
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std::string c_message("c");
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EXPECT_GE(ticket_c = absl::debugging_internal::InstallSymbolDecorator(
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DummySymbolDecorator, &c_message),
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0);
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char *address = reinterpret_cast<char *>(1);
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EXPECT_STREQ("abc", TrySymbolize(address++));
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EXPECT_TRUE(absl::debugging_internal::RemoveSymbolDecorator(ticket_b));
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EXPECT_STREQ("ac", TrySymbolize(address++));
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// Cleanup: remove all remaining decorators so other stack traces don't
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// get mystery "ac" decoration.
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EXPECT_TRUE(absl::debugging_internal::RemoveSymbolDecorator(ticket_a));
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EXPECT_TRUE(absl::debugging_internal::RemoveSymbolDecorator(ticket_c));
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}
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// Some versions of Clang with optimizations enabled seem to be able
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// to optimize away the .data section if no variables live in the
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// section. This variable should get placed in the .data section, and
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// the test below checks for the existence of a .data section.
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static int in_data_section = 1;
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TEST(Symbolize, ForEachSection) {
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int fd = TEMP_FAILURE_RETRY(open("/proc/self/exe", O_RDONLY));
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ASSERT_NE(fd, -1);
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std::vector<std::string> sections;
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ASSERT_TRUE(absl::debugging_internal::ForEachSection(
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fd, [§ions](const std::string &name, const ElfW(Shdr) &) {
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sections.push_back(name);
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return true;
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}));
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// Check for the presence of common section names.
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EXPECT_THAT(sections, Contains(".text"));
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EXPECT_THAT(sections, Contains(".rodata"));
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EXPECT_THAT(sections, Contains(".bss"));
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++in_data_section;
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EXPECT_THAT(sections, Contains(".data"));
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close(fd);
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||
|
}
|
||
|
|
||
|
// x86 specific tests. Uses some inline assembler.
|
||
|
extern "C" {
|
||
|
inline void *ABSL_ATTRIBUTE_ALWAYS_INLINE inline_func() {
|
||
|
void *pc = nullptr;
|
||
|
#if defined(__i386__) || defined(__x86_64__)
|
||
|
__asm__ __volatile__("call 1f; 1: pop %0" : "=r"(pc));
|
||
|
#endif
|
||
|
return pc;
|
||
|
}
|
||
|
|
||
|
void *ABSL_ATTRIBUTE_NOINLINE non_inline_func() {
|
||
|
void *pc = nullptr;
|
||
|
#if defined(__i386__) || defined(__x86_64__)
|
||
|
__asm__ __volatile__("call 1f; 1: pop %0" : "=r"(pc));
|
||
|
#endif
|
||
|
return pc;
|
||
|
}
|
||
|
|
||
|
void ABSL_ATTRIBUTE_NOINLINE TestWithPCInsideNonInlineFunction() {
|
||
|
#if defined(ABSL_HAVE_ATTRIBUTE_NOINLINE) && \
|
||
|
(defined(__i386__) || defined(__x86_64__))
|
||
|
void *pc = non_inline_func();
|
||
|
const char *symbol = TrySymbolize(pc);
|
||
|
ABSL_RAW_CHECK(symbol != nullptr, "TestWithPCInsideNonInlineFunction failed");
|
||
|
ABSL_RAW_CHECK(strcmp(symbol, "non_inline_func") == 0,
|
||
|
"TestWithPCInsideNonInlineFunction failed");
|
||
|
std::cout << "TestWithPCInsideNonInlineFunction passed" << std::endl;
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
void ABSL_ATTRIBUTE_NOINLINE TestWithPCInsideInlineFunction() {
|
||
|
#if defined(ABSL_HAVE_ATTRIBUTE_ALWAYS_INLINE) && \
|
||
|
(defined(__i386__) || defined(__x86_64__))
|
||
|
void *pc = inline_func(); // Must be inlined.
|
||
|
const char *symbol = TrySymbolize(pc);
|
||
|
ABSL_RAW_CHECK(symbol != nullptr, "TestWithPCInsideInlineFunction failed");
|
||
|
ABSL_RAW_CHECK(strcmp(symbol, __FUNCTION__) == 0,
|
||
|
"TestWithPCInsideInlineFunction failed");
|
||
|
std::cout << "TestWithPCInsideInlineFunction passed" << std::endl;
|
||
|
#endif
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Test with a return address.
|
||
|
void ABSL_ATTRIBUTE_NOINLINE TestWithReturnAddress() {
|
||
|
#if defined(ABSL_HAVE_ATTRIBUTE_NOINLINE)
|
||
|
void *return_address = __builtin_return_address(0);
|
||
|
const char *symbol = TrySymbolize(return_address);
|
||
|
ABSL_RAW_CHECK(symbol != nullptr, "TestWithReturnAddress failed");
|
||
|
ABSL_RAW_CHECK(strcmp(symbol, "main") == 0, "TestWithReturnAddress failed");
|
||
|
std::cout << "TestWithReturnAddress passed" << std::endl;
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
#elif defined(_WIN32) && defined(_DEBUG)
|
||
|
|
||
|
TEST(Symbolize, Basics) {
|
||
|
EXPECT_STREQ("nonstatic_func", TrySymbolize((void *)(&nonstatic_func)));
|
||
|
|
||
|
// The name of an internal linkage symbol is not specified; allow either a
|
||
|
// mangled or an unmangled name here.
|
||
|
const char* static_func_symbol = TrySymbolize((void *)(&static_func));
|
||
|
ASSERT_TRUE(static_func_symbol != nullptr);
|
||
|
EXPECT_TRUE(strstr(static_func_symbol, "static_func") != nullptr);
|
||
|
|
||
|
EXPECT_TRUE(nullptr == TrySymbolize(nullptr));
|
||
|
}
|
||
|
|
||
|
TEST(Symbolize, Truncation) {
|
||
|
constexpr char kNonStaticFunc[] = "nonstatic_func";
|
||
|
EXPECT_STREQ("nonstatic_func",
|
||
|
TrySymbolizeWithLimit((void *)(&nonstatic_func),
|
||
|
strlen(kNonStaticFunc) + 1));
|
||
|
EXPECT_STREQ("nonstatic_...",
|
||
|
TrySymbolizeWithLimit((void *)(&nonstatic_func),
|
||
|
strlen(kNonStaticFunc) + 0));
|
||
|
EXPECT_STREQ("nonstatic...",
|
||
|
TrySymbolizeWithLimit((void *)(&nonstatic_func),
|
||
|
strlen(kNonStaticFunc) - 1));
|
||
|
EXPECT_STREQ("n...", TrySymbolizeWithLimit((void *)(&nonstatic_func), 5));
|
||
|
EXPECT_STREQ("...", TrySymbolizeWithLimit((void *)(&nonstatic_func), 4));
|
||
|
EXPECT_STREQ("..", TrySymbolizeWithLimit((void *)(&nonstatic_func), 3));
|
||
|
EXPECT_STREQ(".", TrySymbolizeWithLimit((void *)(&nonstatic_func), 2));
|
||
|
EXPECT_STREQ("", TrySymbolizeWithLimit((void *)(&nonstatic_func), 1));
|
||
|
EXPECT_EQ(nullptr, TrySymbolizeWithLimit((void *)(&nonstatic_func), 0));
|
||
|
}
|
||
|
|
||
|
TEST(Symbolize, SymbolizeWithDemangling) {
|
||
|
const char* result = TrySymbolize((void *)(&Foo::func));
|
||
|
ASSERT_TRUE(result != nullptr);
|
||
|
EXPECT_TRUE(strstr(result, "Foo::func") != nullptr) << result;
|
||
|
}
|
||
|
|
||
|
#else // Symbolizer unimplemented
|
||
|
|
||
|
TEST(Symbolize, Unimplemented) {
|
||
|
char buf[64];
|
||
|
EXPECT_FALSE(absl::Symbolize((void *)(&nonstatic_func), buf, sizeof(buf)));
|
||
|
EXPECT_FALSE(absl::Symbolize((void *)(&static_func), buf, sizeof(buf)));
|
||
|
EXPECT_FALSE(absl::Symbolize((void *)(&Foo::func), buf, sizeof(buf)));
|
||
|
}
|
||
|
|
||
|
#endif
|
||
|
|
||
|
int main(int argc, char **argv) {
|
||
|
// Make sure kHpageTextPadding is linked into the binary.
|
||
|
if (volatile_bool) {
|
||
|
ABSL_RAW_LOG(INFO, "%s", kHpageTextPadding);
|
||
|
}
|
||
|
|
||
|
#if ABSL_PER_THREAD_TLS
|
||
|
// Touch the per-thread variables.
|
||
|
symbolize_test_thread_small[0] = 0;
|
||
|
symbolize_test_thread_big[0] = 0;
|
||
|
#endif
|
||
|
|
||
|
absl::InitializeSymbolizer(argv[0]);
|
||
|
testing::InitGoogleTest(&argc, argv);
|
||
|
|
||
|
#ifdef ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE
|
||
|
TestWithPCInsideInlineFunction();
|
||
|
TestWithPCInsideNonInlineFunction();
|
||
|
TestWithReturnAddress();
|
||
|
#endif
|
||
|
|
||
|
return RUN_ALL_TESTS();
|
||
|
}
|