| //===- RemoveAsmMemory.cpp - Remove ``asm("":::"memory")`` ----------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This pass removes all instances of ``asm("":::"memory")``. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/ADT/Twine.h" |
| #include "llvm/IR/Function.h" |
| #include "llvm/IR/InlineAsm.h" |
| #include "llvm/IR/Instructions.h" |
| #include "llvm/IR/Module.h" |
| #include "llvm/IR/InstVisitor.h" |
| #include "llvm/Pass.h" |
| #include <string> |
| |
| using namespace llvm; |
| |
| namespace { |
| class RemoveAsmMemory : public FunctionPass { |
| public: |
| static char ID; // Pass identification, replacement for typeid |
| RemoveAsmMemory() : FunctionPass(ID) { |
| initializeRemoveAsmMemoryPass(*PassRegistry::getPassRegistry()); |
| } |
| |
| bool runOnFunction(Function &F) override; |
| }; |
| |
| class AsmDirectivesVisitor : public InstVisitor<AsmDirectivesVisitor> { |
| public: |
| AsmDirectivesVisitor() : ModifiedFunction(false) {} |
| ~AsmDirectivesVisitor() {} |
| bool modifiedFunction() const { return ModifiedFunction; } |
| |
| /// Only Call Instructions are ever inline assembly directives. |
| void visitCallInst(CallInst &CI); |
| |
| private: |
| bool ModifiedFunction; |
| |
| AsmDirectivesVisitor(const AsmDirectivesVisitor &) = delete; |
| AsmDirectivesVisitor &operator=(const AsmDirectivesVisitor &) = delete; |
| }; |
| } |
| |
| char RemoveAsmMemory::ID = 0; |
| INITIALIZE_PASS(RemoveAsmMemory, "remove-asm-memory", |
| "remove all instances of ``asm(\"\":::\"memory\")``", false, |
| false) |
| |
| bool RemoveAsmMemory::runOnFunction(Function &F) { |
| AsmDirectivesVisitor AV; |
| AV.visit(F); |
| return AV.modifiedFunction(); |
| } |
| |
| void AsmDirectivesVisitor::visitCallInst(CallInst &CI) { |
| llvm_unreachable("no longer maintained"); |
| } |
| |
| namespace llvm { |
| FunctionPass *createRemoveAsmMemoryPass() { return new RemoveAsmMemory(); } |
| } |