forked from OSchip/llvm-project
102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
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// This test program creates a very large number of unique histories.
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// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -m64 -O3 %s -o %t
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// RUN: MSAN_OPTIONS=origin_history_size=7 not %run %t >%t.out 2>&1
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// RUN: FileCheck %s --check-prefix=CHECK7 < %t.out
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// RUN: MSAN_OPTIONS=origin_history_size=2 not %run %t >%t.out 2>&1
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// RUN: FileCheck %s --check-prefix=CHECK2 < %t.out
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// RUN: MSAN_OPTIONS=origin_history_per_stack_limit=1 not %run %t >%t.out 2>&1
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// RUN: FileCheck %s --check-prefix=CHECK-PER-STACK < %t.out
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static char *buf, *cur, *end;
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void init() {
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buf = new char[1000];
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cur = buf;
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end = buf + 1000;
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}
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void line_flush() {
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char *p;
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for (p = cur - 1; p >= buf; --p)
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if (*p == '\n')
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break;
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if (p >= buf) {
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size_t write_sz = p - buf + 1;
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// write(2, buf, write_sz);
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memmove(buf, p + 1, end - p - 1);
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cur -= write_sz;
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}
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}
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void buffered_write(const char *p, size_t sz) {
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while (sz > 0) {
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size_t copy_sz = end - cur;
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if (sz < copy_sz) copy_sz = sz;
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memcpy(cur, p, copy_sz);
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cur += copy_sz;
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sz -= copy_sz;
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line_flush();
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}
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}
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void fn1() {
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buffered_write("a\n", 2);
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}
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void fn2() {
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buffered_write("a\n", 2);
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}
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void fn3() {
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buffered_write("a\n", 2);
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}
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int main(void) {
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init();
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for (int i = 0; i < 2000; ++i) {
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fn1();
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fn2();
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fn3();
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}
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return buf[50];
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}
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// CHECK7: WARNING: MemorySanitizer: use-of-uninitialized-value
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// CHECK7-NOT: Uninitialized value was stored to memory at
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// CHECK7: Uninitialized value was stored to memory at
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// CHECK7-NOT: Uninitialized value was stored to memory at
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// CHECK7: Uninitialized value was stored to memory at
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// CHECK7-NOT: Uninitialized value was stored to memory at
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// CHECK7: Uninitialized value was stored to memory at
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// CHECK7-NOT: Uninitialized value was stored to memory at
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// CHECK7: Uninitialized value was stored to memory at
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// CHECK7-NOT: Uninitialized value was stored to memory at
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// CHECK7: Uninitialized value was stored to memory at
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// CHECK7-NOT: Uninitialized value was stored to memory at
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// CHECK7: Uninitialized value was stored to memory at
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// CHECK7-NOT: Uninitialized value was stored to memory at
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// CHECK7: Uninitialized value was created by a heap allocation
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// CHECK2: WARNING: MemorySanitizer: use-of-uninitialized-value
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// CHECK2-NOT: Uninitialized value was stored to memory at
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// CHECK2: Uninitialized value was stored to memory at
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// CHECK2-NOT: Uninitialized value was stored to memory at
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// CHECK2: Uninitialized value was created by a heap allocation
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// CHECK-PER-STACK: WARNING: MemorySanitizer: use-of-uninitialized-value
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// CHECK-PER-STACK: Uninitialized value was stored to memory at
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// CHECK-PER-STACK: in fn3
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// CHECK-PER-STACK: Uninitialized value was stored to memory at
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// CHECK-PER-STACK: in fn2
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// CHECK-PER-STACK: Uninitialized value was stored to memory at
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// CHECK-PER-STACK: in fn1
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// CHECK-PER-STACK: Uninitialized value was created by a heap allocation
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