[esan] Specify which tool via a global variable

Summary:
Adds a global variable to specify the tool, to support handling early
interceptors that invoke instrumented code, thus requiring shadow memory to
be initialized prior to __esan_init() being invoked.

Reviewers: aizatsky

Subscribers: vitalybuka, zhaoqin, kcc, eugenis, llvm-commits, kubabrecka

Differential Revision: http://reviews.llvm.org/D20974

llvm-svn: 271714

1 files changed, 4 insertions, 1 deletions

diff --git a/compiler-rt/lib/esan/esan_interface.cpp b/compiler-rt/lib/esan/esan_interface.cpp
index 5b10f7f2e82..f6ad3caa841 100644
--- a/compiler-rt/lib/esan/esan_interface.cpp
+++ b/compiler-rt/lib/esan/esan_interface.cpp
@@ -18,7 +18,10 @@
 using namespace __esan; // NOLINT
 
 void __esan_init(ToolType Tool, void *Ptr) {
-  WhichTool = Tool;
+  if (Tool != __esan_which_tool) {
+    Printf("ERROR: tool mismatch: %d vs %d\n", Tool, __esan_which_tool);
+    Die();
+  }
   initializeLibrary(Tool);
   processCompilationUnitInit(Ptr);
 }