I can insert passes

Author: bharrisau

mk/rustllvm.mk

@@ -22,7 +22,7 @@ LLVM_EXTRA_INCDIRS_$(1)= -iquote $(S)src/llvm/include \
                          -iquote $$(CFG_LLVM_BUILD_DIR_$(1))/include
 endif
 
-RUSTLLVM_OBJS_CS_$(1) := $$(addprefix rustllvm/, RustWrapper.cpp PassWrapper.cpp)
+RUSTLLVM_OBJS_CS_$(1) := $$(addprefix rustllvm/, RustWrapper.cpp PassWrapper.cpp RustStackPass.cpp)
 
 RUSTLLVM_DEF_$(1) := $(1)/rustllvm/rustllvm$(CFG_DEF_SUFFIX_$(1))
 

src/rustllvm/PassWrapper.cpp

@@ -43,6 +43,11 @@ LLVMInitializePasses() {
   initializeInstCombine(Registry);
   initializeInstrumentation(Registry);
   initializeTarget(Registry);
+
+  // Initialize our pass
+  PassInfo *PI = new PassInfo("Rust Stack Safety Pass", "rustsafestack", & RustSafeStack::ID,
+                  PassInfo::NormalCtor_t(callDefaultCtor<RustSafeStack>), false, false);
+  Registry.registerPass(*PI, true);
 }
 
 extern "C" bool
@@ -174,8 +179,17 @@ LLVMRustWriteOutputFile(LLVMTargetMachineRef Target,
   formatted_raw_ostream FOS(OS);
 
   unwrap(Target)->addPassesToEmitFile(*PM, FOS, FileType, false);
-  PM->run(*unwrap(M));
-  return true;
+
+  StringRef SR("rustsafestack");
+  PassRegistry *PR = PassRegistry::getPassRegistry();
+
+  const PassInfo *PI = PR->getPassInfo(SR);
+  if (PI) {
+      PM->add(PI->createPass());
+      PM->run(*unwrap(M));
+      return true;
+  }
+  return false;
 }
 
 extern "C" void

src/rustllvm/RustStackPass.cpp

@@ -0,0 +1,24 @@
+#include "rustllvm.h"
+
+using namespace llvm;
+
+void RustSafeStack::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.setPreservesCFG();
+  AU.addPreserved<MachineLoopInfo>();
+  AU.addPreserved<MachineDominatorTree>();
+
+  // Get pass ID for PEI
+  StringRef SR("prologepilog");
+  const void *pei_id = PassRegistry::getPassRegistry()->getPassInfo(SR)->getTypeInfo();
+  AU.addRequiredID(pei_id);
+
+  MachineFunctionPass::getAnalysisUsage(AU);
+}
+
+bool RustSafeStack::runOnMachineFunction(MachineFunction &Fn) {
+  errs() << "Rust stack safety running\n";
+  return false;
+}
+
+char RustSafeStack::ID = 0;
+//static RegisterPass<RustSafeStack> X("rustsafestack", "Rust Stack Safety Pass", false, false);

src/rustllvm/rustllvm.h

@@ -51,6 +51,9 @@
 #include "llvm-c/BitReader.h"
 #include "llvm-c/ExecutionEngine.h"
 #include "llvm-c/Object.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineLoopInfo.h"
+#include "llvm/CodeGen/MachineDominators.h"
 
 // Used by RustMCJITMemoryManager::getPointerToNamedFunction()
 // to get around glibc issues. See the function for more information.
@@ -61,3 +64,15 @@
 #endif
 
 extern const char* LLVMRustError;
+
+namespace llvm {
+  class RustSafeStack : public MachineFunctionPass {
+  public:
+    static char ID;
+    RustSafeStack() : MachineFunctionPass(ID) {
+      //initializePEIPass(*PassRegistry::getPassRegistry());
+    }
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const;
+    bool runOnMachineFunction(MachineFunction &Fn);
+  };
+}