Move the check for "calls setjmp" to SelectionDAGISel so that it can be used by

more than just the stack slot coloring algorithm.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104722 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 32 insertions, 0 deletions

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 6d789a6..fc830ac 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -25,6 +25,7 @@
 #include "llvm/Intrinsics.h"
 #include "llvm/IntrinsicInst.h"
 #include "llvm/LLVMContext.h"
+#include "llvm/Module.h"
 #include "llvm/CodeGen/FastISel.h"
 #include "llvm/CodeGen/GCStrategy.h"
 #include "llvm/CodeGen/GCMetadata.h"
@@ -191,6 +192,34 @@ void SelectionDAGISel::getAnalysisUsage(AnalysisUsage &AU) const {
   MachineFunctionPass::getAnalysisUsage(AU);
 }
 
+/// FunctionCallsSetJmp - Return true if the function has a call to setjmp or
+/// sigsetjmp. This is used to limit code-gen optimizations on the machine
+/// function.
+static bool FunctionCallsSetJmp(const Function *F) {
+  const Module *M = F->getParent();
+  const Function *SetJmp = M->getFunction("setjmp");
+  const Function *SigSetJmp = M->getFunction("sigsetjmp");
+
+  if (!SetJmp && !SigSetJmp)
+    return false;
+
+  if (SetJmp && !SetJmp->use_empty())
+    for (Value::const_use_iterator
+           I = SetJmp->use_begin(), E = SetJmp->use_end(); I != E; ++I)
+      if (const CallInst *CI = dyn_cast<CallInst>(I))
+        if (CI->getParent()->getParent() == F)
+          return true;
+
+  if (SigSetJmp && !SigSetJmp->use_empty())
+    for (Value::const_use_iterator
+           I = SigSetJmp->use_begin(), E = SigSetJmp->use_end(); I != E; ++I)
+      if (const CallInst *CI = dyn_cast<CallInst>(I))
+        if (CI->getParent()->getParent() == F)
+          return true;
+
+  return false;
+}
+
 bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
   // Do some sanity-checking on the command-line options.
   assert((!EnableFastISelVerbose || EnableFastISel) &&
@@ -253,6 +282,9 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
   done:;
   }
 
+  // Determine if there is a call to setjmp in the machine function.
+  MF->setCallsSetJmp(FunctionCallsSetJmp(&Fn));
+
   // Release function-specific state. SDB and CurDAG are already cleared
   // at this point.
   FuncInfo->clear();