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-rw-r--r--test/asan/TestCases/alloca_vla_interact.cc41
1 files changed, 41 insertions, 0 deletions
diff --git a/test/asan/TestCases/alloca_vla_interact.cc b/test/asan/TestCases/alloca_vla_interact.cc
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+++ b/test/asan/TestCases/alloca_vla_interact.cc
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+// RUN: %clangxx_asan -O0 -mllvm -asan-instrument-allocas %s -o %t
+// RUN: %run %t 2>&1
+//
+// REQUIRES: stable-runtime
+// XFAIL: powerpc64
+
+// This testcase checks correct interaction between VLAs and allocas.
+
+#include <assert.h>
+#include <alloca.h>
+#include <stdint.h>
+#include "sanitizer/asan_interface.h"
+
+#define RZ 32
+
+__attribute__((noinline)) void foo(int len) {
+ char *top, *bot;
+ // This alloca call should live until the end of foo.
+ char *alloca1 = (char *)alloca(len);
+ assert(!(reinterpret_cast<uintptr_t>(alloca1) & 31L));
+ // This should be first poisoned address after loop.
+ top = alloca1 - RZ;
+ for (int i = 0; i < 32; ++i) {
+ // Check that previous alloca was unpoisoned at the end of iteration.
+ if (i) assert(!__asan_region_is_poisoned(bot, 96));
+ // VLA is unpoisoned at the end of iteration.
+ volatile char array[i];
+ assert(!(reinterpret_cast<uintptr_t>(array) & 31L));
+ // Alloca is unpoisoned at the end of iteration,
+ // because dominated by VLA.
+ bot = (char *)alloca(i) - RZ;
+ }
+ // Check that all allocas from loop were unpoisoned correctly.
+ void *q = __asan_region_is_poisoned(bot, (char *)top - (char *)bot + 1);
+ assert(q == top);
+}
+
+int main(int argc, char **argv) {
+ foo(32);
+ return 0;
+}