From: Mohit K. Bhakkad <mohit.bhakkad@gmail.com>
Date: Tue, 1 Mar 2016 05:53:30 +0000 (+0000)
Subject: [Compiler-rt][MSan] fix param_tls_limit test for platforms where big arguments are... 
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=94aa4d7e832b819afe18c70a4ac3c6ae53b8c1af;p=platform%2Fupstream%2Fllvm.git

[Compiler-rt][MSan] fix param_tls_limit test for platforms where big arguments are sliced in smaller ones

Reviewers: eugenis

Subscribers: dsanders, jaydeep, sagar, llvm-commits

Differential Revision: http://reviews.llvm.org/D17129

llvm-svn: 262302
---

diff --git a/compiler-rt/test/msan/param_tls_limit.cc b/compiler-rt/test/msan/param_tls_limit.cc
index 1c504da..d34376a 100644
--- a/compiler-rt/test/msan/param_tls_limit.cc
+++ b/compiler-rt/test/msan/param_tls_limit.cc
@@ -20,6 +20,17 @@
 // In case of no overflow, it is still poisoned.
 #define NO_OVERFLOW(x) assert(__msan_test_shadow(&x, sizeof(x)) == 0)
 
+#if defined(__x86_64__)
+// In x86_64, if argument is partially outside tls, it is considered completly
+// unpoisoned
+#define PARTIAL_OVERFLOW(x) OVERFLOW(x)
+#else
+// In other archs, bigger arguments are splitted in multiple IR arguments, so
+// they are considered poisoned till tls limit. Checking last byte of such arg:
+#define PARTIAL_OVERFLOW(x) assert(__msan_test_shadow((char *)(&(x) + 1) - 1, 1) == -1)
+#endif
+
+
 template<int N>
 struct S {
   char x[N];
@@ -34,17 +45,17 @@ void f800(S<800> s) {
 }
 
 void f801(S<801> s) {
-  OVERFLOW(s);
+  PARTIAL_OVERFLOW(s);
 }
 
 void f1000(S<1000> s) {
-  OVERFLOW(s);
+  PARTIAL_OVERFLOW(s);
 }
 
 void f_many(int a, double b, S<800> s, int c, double d) {
   NO_OVERFLOW(a);
   NO_OVERFLOW(b);
-  OVERFLOW(s);
+  PARTIAL_OVERFLOW(s);
   OVERFLOW(c);
   OVERFLOW(d);
 }
@@ -54,7 +65,7 @@ void f_many(int a, double b, S<800> s, int c, double d) {
 void f_many2(int a, S<800 - 8 - 2> s, int c, double d) {
   NO_OVERFLOW(a);
   NO_OVERFLOW(s);
-  OVERFLOW(c);
+  PARTIAL_OVERFLOW(c);
   OVERFLOW(d);
 }