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//===- AddPNaClExternalDecls.cpp - Add decls for PNaCl external functions -===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This pass adds function declarations for external functions used by PNaCl.
// These externals are implemented in native libraries and calls to them are
// created as part of the translation process.
//
// Running this pass is a precondition for running ResolvePNaClIntrinsics. They
// are separate because one is a ModulePass and the other is a FunctionPass.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/Pass.h"
#include "llvm/Transforms/NaCl.h"
using namespace llvm;
namespace {
// This is a module pass because it adds declarations to the module.
class AddPNaClExternalDecls : public ModulePass {
public:
static char ID;
AddPNaClExternalDecls() : ModulePass(ID) {
initializeAddPNaClExternalDeclsPass(*PassRegistry::getPassRegistry());
}
virtual bool runOnModule(Module &M);
};
}
bool AddPNaClExternalDecls::runOnModule(Module &M) {
// Add declarations for a pre-defined set of external functions to the module.
// The function names must match the functions implemented in native code (in
// pnacl/support). The function types must match the types of the LLVM
// intrinsics.
// We expect these declarations not to exist in the module before this pass
// runs, but don't assert it; it will be handled by the ABI verifier.
LLVMContext &C = M.getContext();
M.getOrInsertFunction("setjmp",
// return type
Type::getInt32Ty(C),
// arguments
Type::getInt8Ty(C)->getPointerTo(),
NULL);
M.getOrInsertFunction("longjmp",
// return type
Type::getVoidTy(C),
// arguments
Type::getInt8Ty(C)->getPointerTo(),
Type::getInt32Ty(C),
NULL);
return true;
}
char AddPNaClExternalDecls::ID = 0;
INITIALIZE_PASS(AddPNaClExternalDecls, "add-pnacl-external-decls",
"Add declarations of external functions used by PNaCl",
false, false)
ModulePass *llvm::createAddPNaClExternalDeclsPass() {
return new AddPNaClExternalDecls();
}
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