r270849 - [Analyzer] Correct stack address escape diagnostic

[Sean Eveson via cfe-commits]

Author: seaneveson
Date: Thu May 26 09:02:17 2016
New Revision: 270849

URL: http://llvm.org/viewvc/llvm-project?rev=270849&view=rev
Log:
[Analyzer] Correct stack address escape diagnostic

Summary:
Leaking a stack address via a static variable refers to it in the diagnostic as a 'global'. This patch corrects the diagnostic for static variables.


Patch by Phil Camp, SN Systems

Reviewers: dcoughlin, zaks.anna

Subscribers: xazax.hun, cfe-commits

Differential Revision: http://reviews.llvm.org/D19866

Patch by Phil Camp

Modified:
    cfe/trunk/lib/StaticAnalyzer/Checkers/StackAddrEscapeChecker.cpp
    cfe/trunk/test/Analysis/stackaddrleak.c

Modified: cfe/trunk/lib/StaticAnalyzer/Checkers/StackAddrEscapeChecker.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/StaticAnalyzer/Checkers/StackAddrEscapeChecker.cpp?rev=270849&r1=270848&r2=270849&view=diff
==============================================================================
--- cfe/trunk/lib/StaticAnalyzer/Checkers/StackAddrEscapeChecker.cpp (original)
+++ cfe/trunk/lib/StaticAnalyzer/Checkers/StackAddrEscapeChecker.cpp Thu May 26 09:02:17 2016
@@ -236,7 +236,12 @@ void StackAddrEscapeChecker::checkEndFun
     SmallString<512> buf;
     llvm::raw_svector_ostream os(buf);
     SourceRange range = genName(os, cb.V[i].second, Ctx.getASTContext());
-    os << " is still referred to by the global variable '";
+    os << " is still referred to by the ";
+    if (isa<StaticGlobalSpaceRegion>(cb.V[i].first->getMemorySpace()))
+      os << "static";
+    else
+      os << "global";
+    os << " variable '";
     const VarRegion *VR = cast<VarRegion>(cb.V[i].first->getBaseRegion());
     os << *VR->getDecl()
        << "' upon returning to the caller.  This will be a dangling reference";

Modified: cfe/trunk/test/Analysis/stackaddrleak.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Analysis/stackaddrleak.c?rev=270849&r1=270848&r2=270849&view=diff
==============================================================================
--- cfe/trunk/test/Analysis/stackaddrleak.c (original)
+++ cfe/trunk/test/Analysis/stackaddrleak.c Thu May 26 09:02:17 2016
@@ -19,7 +19,7 @@ void f2() {
   p = (const char *) __builtin_alloca(12);
 } // expected-warning{{Address of stack memory allocated by call to alloca() on line 19 is still referred to by the global variable 'p' upon returning to the caller.  This will be a dangling reference}}
 
-// PR 7383 - previosly the stack address checker would crash on this example
+// PR 7383 - previously the stack address checker would crash on this example
 //  because it would attempt to do a direct load from 'pr7383_list'. 
 static int pr7383(__const char *__)
 {
@@ -33,7 +33,7 @@ void test_multi_return() {
   int x;
   a = &x;
   b = &x;
-} // expected-warning{{Address of stack memory associated with local variable 'x' is still referred to by the global variable 'a' upon returning}} expected-warning{{Address of stack memory associated with local variable 'x' is still referred to by the global variable 'b' upon returning}}
+} // expected-warning{{Address of stack memory associated with local variable 'x' is still referred to by the static variable 'a' upon returning}} expected-warning{{Address of stack memory associated with local variable 'x' is still referred to by the static variable 'b' upon returning}}
 
 intptr_t returnAsNonLoc() {
   int x;