1 files changed, 0 insertions, 281 deletions
diff --git a/contrib/llvm/tools/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptx86ABIFixups.cpp b/contrib/llvm/tools/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptx86ABIFixups.cpp
deleted file mode 100644
index 4725e8c5b0eb..000000000000
--- a/contrib/llvm/tools/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptx86ABIFixups.cpp
+++ /dev/null
@@ -1,281 +0,0 @@
-//===-- RenderScriptx86ABIFixups.cpp ----------------------------*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include <set>
-
-#include "llvm/ADT/StringRef.h"
-#include "llvm/IR/BasicBlock.h"
-#include "llvm/IR/CallSite.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/Function.h"
-#include "llvm/IR/Instruction.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/Module.h"
-#include "llvm/IRReader/IRReader.h"
-#include "llvm/Pass.h"
-
-#include "lldb/Target/Process.h"
-#include "lldb/Utility/Log.h"
-
-using namespace lldb_private;
-namespace {
-
-bool isRSAPICall(llvm::Module &module, llvm::CallInst *call_inst) {
-  // TODO get the list of renderscript modules from lldb and check if
-  // this llvm::Module calls into any of them.
-  (void)module;
-  const auto func_name = call_inst->getCalledFunction()->getName();
-  if (func_name.startswith("llvm") || func_name.startswith("lldb"))
-    return false;
-
-  if (call_inst->getCalledFunction()->isIntrinsic())
-    return false;
-
-  return true;
-}
-
-bool isRSLargeReturnCall(llvm::Module &module, llvm::CallInst *call_inst) {
-  // i686 and x86_64 returns for large vectors in the RenderScript API are not
-  // handled as normal register pairs, but as a hidden sret type. This is not
-  // reflected in the debug info or mangled symbol name, and the android ABI
-  // for x86 and x86_64, (as well as the emulators) specifies there is no AVX,
-  // so bcc generates an sret function because we cannot natively return
-  // 256 bit vectors.
-  // This function simply checks whether a function has a > 128bit return type.
-  // It is perhaps an unreliable heuristic, and relies on bcc not generating
-  // AVX code, so if the android ABI one day provides for AVX, this function
-  // may go out of fashion.
-  (void)module;
-  if (!call_inst || !call_inst->getCalledFunction())
-    return false;
-
-  return call_inst->getCalledFunction()
-             ->getReturnType()
-             ->getPrimitiveSizeInBits() > 128;
-}
-
-bool isRSAllocationPtrTy(const llvm::Type *type) {
-  if (!type->isPointerTy())
-    return false;
-  auto ptr_type = type->getPointerElementType();
-
-  return ptr_type->isStructTy() &&
-         ptr_type->getStructName().startswith("struct.rs_allocation");
-}
-
-bool isRSAllocationTyCallSite(llvm::Module &module, llvm::CallInst *call_inst) {
-  (void)module;
-  if (!call_inst->hasByValArgument())
-    return false;
-  for (const auto &param : call_inst->operand_values())
-    if (isRSAllocationPtrTy(param->getType()))
-      return true;
-  return false;
-}
-
-llvm::FunctionType *cloneToStructRetFnTy(llvm::CallInst *call_inst) {
-  // on x86 StructReturn functions return a pointer to the return value, rather
-  // than the return value itself
-  // [ref](http://www.agner.org/optimize/calling_conventions.pdf section 6). We
-  // create a return type by getting the pointer type of the old return type,
-  // and inserting a new initial argument of pointer type of the original
-  // return type.
-  Log *log(
-      GetLogIfAnyCategoriesSet(LIBLLDB_LOG_LANGUAGE | LIBLLDB_LOG_EXPRESSIONS));
-
-  assert(call_inst && "no CallInst");
-  llvm::Function *orig = call_inst->getCalledFunction();
-  assert(orig && "CallInst has no called function");
-  llvm::FunctionType *orig_type = orig->getFunctionType();
-  auto name = orig->getName();
-  if (log)
-    log->Printf("%s - cloning to StructRet function for '%s'", __FUNCTION__,
-                name.str().c_str());
-
-  unsigned num_params = orig_type->getNumParams();
-  std::vector<llvm::Type *> new_params{num_params + 1, nullptr};
-  std::vector<llvm::Type *> params{orig_type->param_begin(),
-                                   orig_type->param_end()};
-
-  // This may not work if the function is somehow declared void as llvm is
-  // strongly typed and represents void* with i8*
-  assert(!orig_type->getReturnType()->isVoidTy() &&
-         "Cannot add StructRet attribute to void function");
-  llvm::PointerType *return_type_ptr_type =
-      llvm::PointerType::getUnqual(orig->getReturnType());
-  assert(return_type_ptr_type &&
-         "failed to get function return type PointerType");
-  if (!return_type_ptr_type)
-    return nullptr;
-
-  if (log)
-    log->Printf("%s - return type pointer type for StructRet clone @ '0x%p':\n",
-                __FUNCTION__, (void *)return_type_ptr_type);
-  // put the sret pointer argument in place at the beginning of the
-  // argument list.
-  params.emplace(params.begin(), return_type_ptr_type);
-  assert(params.size() == num_params + 1);
-  return llvm::FunctionType::get(return_type_ptr_type, params,
-                                 orig->isVarArg());
-}
-
-bool findRSCallSites(llvm::Module &module,
-                     std::set<llvm::CallInst *> &rs_callsites,
-                     bool (*predicate)(llvm::Module &, llvm::CallInst *)) {
-  bool found = false;
-
-  for (auto &func : module.getFunctionList())
-    for (auto &block : func.getBasicBlockList())
-      for (auto &inst : block) {
-        llvm::CallInst *call_inst =
-            llvm::dyn_cast_or_null<llvm::CallInst>(&inst);
-        if (!call_inst || !call_inst->getCalledFunction())
-          // This is not the call-site you are looking for...
-          continue;
-        if (isRSAPICall(module, call_inst) && predicate(module, call_inst)) {
-          rs_callsites.insert(call_inst);
-          found = true;
-        }
-      }
-  return found;
-}
-
-bool fixupX86StructRetCalls(llvm::Module &module) {
-  bool changed = false;
-  // changing a basic block while iterating over it seems to have some
-  // undefined behaviour going on so we find all RS callsites first, then fix
-  // them up after consuming the iterator.
-  std::set<llvm::CallInst *> rs_callsites;
-  if (!findRSCallSites(module, rs_callsites, isRSLargeReturnCall))
-    return false;
-
-  for (auto call_inst : rs_callsites) {
-    llvm::FunctionType *new_func_type = cloneToStructRetFnTy(call_inst);
-    assert(new_func_type &&
-           "failed to clone functionType for Renderscript ABI fixup");
-
-    llvm::CallSite call_site(call_inst);
-    llvm::Function *func = call_inst->getCalledFunction();
-    assert(func && "cannot resolve function in RenderScriptRuntime");
-    // Copy the original call arguments
-    std::vector<llvm::Value *> new_call_args(call_site.arg_begin(),
-                                             call_site.arg_end());
-
-    // Allocate enough space to store the return value of the original function
-    // we pass a pointer to this allocation as the StructRet param, and then
-    // copy its value into the lldb return value
-    const llvm::DataLayout &DL = module.getDataLayout();
-    llvm::AllocaInst *return_value_alloc = new llvm::AllocaInst(
-      func->getReturnType(), DL.getAllocaAddrSpace(), "var_vector_return_alloc",
-      call_inst);
-    // use the new allocation as the new first argument
-    new_call_args.emplace(new_call_args.begin(),
-                          llvm::cast<llvm::Value>(return_value_alloc));
-    llvm::PointerType *new_func_ptr_type =
-        llvm::PointerType::get(new_func_type, 0);
-    // Create the type cast from the old function type to the new one
-    llvm::Constant *new_func_cast = llvm::ConstantExpr::getCast(
-        llvm::Instruction::BitCast, func, new_func_ptr_type);
-    // create an allocation for a new function pointer
-    llvm::AllocaInst *new_func_ptr =
-        new llvm::AllocaInst(new_func_ptr_type, DL.getAllocaAddrSpace(),
-                             "new_func_ptr", call_inst);
-    // store the new_func_cast to the newly allocated space
-    (new llvm::StoreInst(new_func_cast, new_func_ptr, call_inst))
-        ->setName("new_func_ptr_load_cast");
-    // load the new function address ready for a jump
-    llvm::LoadInst *new_func_addr_load =
-        new llvm::LoadInst(new_func_ptr, "load_func_pointer", call_inst);
-    // and create a callinstruction from it
-    llvm::CallInst *new_call_inst =
-        llvm::CallInst::Create(new_func_type, new_func_addr_load, new_call_args,
-                               "new_func_call", call_inst);
-    new_call_inst->setCallingConv(call_inst->getCallingConv());
-    new_call_inst->setTailCall(call_inst->isTailCall());
-    llvm::LoadInst *lldb_save_result_address =
-        new llvm::LoadInst(return_value_alloc, "save_return_val", call_inst);
-
-    // Now remove the old broken call
-    call_inst->replaceAllUsesWith(lldb_save_result_address);
-    call_inst->eraseFromParent();
-    changed = true;
-  }
-  return changed;
-}
-
-bool fixupRSAllocationStructByValCalls(llvm::Module &module) {
-  // On x86_64, calls to functions in the RS runtime that take an
-  // `rs_allocation` type argument are actually handled as by-ref params by
-  // bcc, but appear to be passed by value by lldb (the callsite all use
-  // `struct byval`). On x86_64 Linux, struct arguments are transferred in
-  // registers if the struct size is no bigger than 128bits
-  // [ref](http://www.agner.org/optimize/calling_conventions.pdf) section 7.1
-  // "Passing and returning objects" otherwise passed on the stack. an object
-  // of type `rs_allocation` is actually 256bits, so should be passed on the
-  // stack. However, code generated by bcc actually treats formal params of
-  // type `rs_allocation` as `rs_allocation *` so we need to convert the
-  // calling convention to pass by reference, and remove any hint of byval from
-  // formal parameters.
-  bool changed = false;
-  std::set<llvm::CallInst *> rs_callsites;
-  if (!findRSCallSites(module, rs_callsites, isRSAllocationTyCallSite))
-    return false;
-
-  std::set<llvm::Function *> rs_functions;
-
-  // for all call instructions
-  for (auto call_inst : rs_callsites) {
-    // add the called function to a set so that we can strip its byval
-    // attributes in another pass
-    rs_functions.insert(call_inst->getCalledFunction());
-
-    // get the function attributes
-    llvm::AttributeList call_attribs = call_inst->getAttributes();
-
-    // iterate over the argument attributes
-    for (unsigned I = call_attribs.index_begin(); I != call_attribs.index_end();
-         I++) {
-      // if this argument is passed by val
-      if (call_attribs.hasAttribute(I, llvm::Attribute::ByVal)) {
-        // strip away the byval attribute
-        call_inst->removeAttribute(I, llvm::Attribute::ByVal);
-        changed = true;
-      }
-    }
-  }
-
-  // for all called function decls
-  for (auto func : rs_functions) {
-    // inspect all of the arguments in the call
-    for (auto &arg : func->args()) {
-      if (arg.hasByValAttr()) {
-        arg.removeAttr(llvm::Attribute::ByVal);
-        changed = true;
-      }
-    }
-  }
-  return changed;
-}
-} // end anonymous namespace
-
-namespace lldb_private {
-namespace lldb_renderscript {
-
-bool fixupX86FunctionCalls(llvm::Module &module) {
-  return fixupX86StructRetCalls(module);
-}
-
-bool fixupX86_64FunctionCalls(llvm::Module &module) {
-  bool changed = false;
-  changed |= fixupX86StructRetCalls(module);
-  changed |= fixupRSAllocationStructByValCalls(module);
-  return changed;
-}
-
-} // end namespace lldb_renderscript
-} // end namespace lldb_private