[sancov] Name the global containing the main source file name

If the global name doesn't start with __sancov_gen, ASan will insert
unecessary red zones around it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287117 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Instrumentation/SanitizerCoverage.cpp b/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
index 031effb..730e28a 100644 (file)
--- a/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
+++ b/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
@@ -357,9 +357,9 @@ bool SanitizerCoverageModule::runOnModule(Module &M) {
   // Create variable for module (compilation unit) name
   Constant *ModNameStrConst =
       ConstantDataArray::getString(M.getContext(), M.getName(), true);
-  GlobalVariable *ModuleName =
-      new GlobalVariable(M, ModNameStrConst->getType(), true,
-                         GlobalValue::PrivateLinkage, ModNameStrConst);
+  GlobalVariable *ModuleName = new GlobalVariable(
+      M, ModNameStrConst->getType(), true, GlobalValue::PrivateLinkage,
+      ModNameStrConst, "__sancov_gen_modname");
   if (Options.TracePCGuard) {
     if (HasSancovGuardsSection) {
       Function *CtorFunc;

diff --git a/test/Instrumentation/SanitizerCoverage/coverage.ll b/test/Instrumentation/SanitizerCoverage/coverage.ll
index bc32374..a2a92a0 100644 (file)
--- a/test/Instrumentation/SanitizerCoverage/coverage.ll
+++ b/test/Instrumentation/SanitizerCoverage/coverage.ll
@@ -49,7 +49,7 @@ entry:
 
 ; CHECK1-LABEL: define internal void @sancov.module_ctor
 ; CHECK1-NOT: ret
-; CHECK1: call void @__sanitizer_cov_module_init({{.*}}, i64 2,
+; CHECK1: call void @__sanitizer_cov_module_init({{.*}}, i64 2, {{.*}}@__sancov_gen_modname
 ; CHECK1: ret
 
 ; CHECK_WITH_CHECK-LABEL: define void @foo