1f242d6a77
This flag allows to disable old way of determining dynamic TLS by filtering out allocations from dynamic linker. This will be eventually superseded by __tls_get_addr interceptor (see r257785), after we: 1) Test it in several supported environments 2) Deal with existing problems (currently we can't find a pointer to DTV which is calloc()-ed in pthread_create). llvm-svn: 257789
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
// Test that dynamically allocated TLS space is included in the root set.
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// RUN: LSAN_BASE="report_objects=1:use_stacks=0:use_registers=0:use_ld_allocations=0"
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// RUN: %clangxx %s -DBUILD_DSO -fPIC -shared -o %t-so.so
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// RUN: %clangxx_lsan %s -o %t
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// RUN: LSAN_OPTIONS=$LSAN_BASE:"use_tls=0" not %run %t 2>&1 | FileCheck %s
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// RUN: LSAN_OPTIONS=$LSAN_BASE:"use_tls=1" %run %t 2>&1
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// RUN: LSAN_OPTIONS="" %run %t 2>&1
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#ifndef BUILD_DSO
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#include <assert.h>
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#include <dlfcn.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string>
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int main(int argc, char *argv[]) {
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std::string path = std::string(argv[0]) + "-so.so";
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void *handle = dlopen(path.c_str(), RTLD_LAZY);
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assert(handle != 0);
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typedef void **(* store_t)(void *p);
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store_t StoreToTLS = (store_t)dlsym(handle, "StoreToTLS");
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assert(dlerror() == 0);
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void *p = malloc(1337);
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// If we don't know about dynamic TLS, we will return a false leak above.
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void **p_in_tls = StoreToTLS(p);
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assert(*p_in_tls == p);
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fprintf(stderr, "Test alloc: %p.\n", p);
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return 0;
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}
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// CHECK: Test alloc: [[ADDR:.*]].
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// CHECK: LeakSanitizer: detected memory leaks
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// CHECK: [[ADDR]] (1337 bytes)
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// CHECK: SUMMARY: {{(Leak|Address)}}Sanitizer:
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#else // BUILD_DSO
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// A loadable module with a large thread local section, which would require
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// allocation of a new TLS storage chunk when loaded with dlopen(). We use it
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// to test the reachability of such chunks in LSan tests.
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// This must be large enough that it doesn't fit into preallocated static TLS
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// space (see STATIC_TLS_SURPLUS in glibc).
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__thread void *huge_thread_local_array[(1 << 20) / sizeof(void *)]; // NOLINT
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extern "C" void **StoreToTLS(void *p) {
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huge_thread_local_array[0] = p;
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return &huge_thread_local_array[0];
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}
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#endif // BUILD_DSO
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