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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "upcall_compiler.h"
#include "compilation_unit.h"
#include "compiled_method.h"
#include "compiler.h"
#include "compiler_llvm.h"
#include "ir_builder.h"
#include "logging.h"
#include "object.h"
#include "runtime_support_func.h"
#include <llvm/Analysis/Verifier.h>
#include <llvm/BasicBlock.h>
#include <llvm/Function.h>
#include <llvm/GlobalVariable.h>
#include <llvm/Intrinsics.h>
#include <string>
#include <string.h>
namespace art {
namespace compiler_llvm {
using namespace runtime_support;
UpcallCompiler::UpcallCompiler(CompilationUnit* cunit, Compiler& compiler)
: cunit_(cunit), compiler_(&compiler), module_(cunit_->GetModule()),
context_(cunit_->GetLLVMContext()), irb_(*cunit_->GetIRBuilder()) {
}
CompiledInvokeStub* UpcallCompiler::CreateStub(bool is_static,
char const* shorty) {
CHECK_NE(shorty, static_cast<char const*>(NULL));
size_t shorty_size = strlen(shorty);
// Function name
std::string func_name;
if (is_static) {
StringAppendF(&func_name, "ArtSUpcall_%s", shorty);
} else {
StringAppendF(&func_name, "ArtUpcall_%s", shorty);
}
// Get argument types
llvm::Type* arg_types[] = {
irb_.getJObjectTy(), // Method object pointer
irb_.getJObjectTy(), // "this" object pointer (NULL for static)
irb_.getJObjectTy(), // Thread object pointer
irb_.getJValueTy()->getPointerTo(),
irb_.getJValueTy()->getPointerTo(),
};
// Function type
llvm::FunctionType* func_type =
llvm::FunctionType::get(irb_.getVoidTy(), arg_types, false);
// Create function
llvm::Function* func =
llvm::Function::Create(func_type, llvm::Function::ExternalLinkage,
func_name, module_);
// Create basic block for the body of this function
llvm::BasicBlock* block_body =
llvm::BasicBlock::Create(*context_, "upcall", func);
irb_.SetInsertPoint(block_body);
// Actual arguments
llvm::Function::arg_iterator arg_iter = func->arg_begin();
llvm::Value* method_object_addr = arg_iter++;
llvm::Value* callee_this_addr = arg_iter++;
llvm::Value* thread_object_addr = arg_iter++;
llvm::Value* actual_args_array_addr = arg_iter++;
llvm::Value* retval_addr = arg_iter++;
// Setup thread pointer
irb_.CreateCall(irb_.GetRuntime(SetCurrentThread), thread_object_addr);
// Accurate function type
llvm::Type* accurate_ret_type = irb_.getJType(shorty[0], kAccurate);
std::vector<llvm::Type*> accurate_arg_types;
accurate_arg_types.push_back(irb_.getJObjectTy()); // method object pointer
if (!is_static) {
accurate_arg_types.push_back(irb_.getJObjectTy());
}
for (size_t i = 1; i < shorty_size; ++i) {
accurate_arg_types.push_back(irb_.getJType(shorty[i], kAccurate));
}
llvm::FunctionType* accurate_func_type =
llvm::FunctionType::get(accurate_ret_type, accurate_arg_types, false);
// Load actual arguments
std::vector<llvm::Value*> args;
args.push_back(method_object_addr);
if (!is_static) {
args.push_back(callee_this_addr);
}
for (size_t i = 1; i < shorty_size; ++i) {
char arg_shorty = shorty[i];
if (arg_shorty == 'Z' || arg_shorty == 'B' || arg_shorty == 'C' ||
arg_shorty == 'S' || arg_shorty == 'I' || arg_shorty == 'J' ||
arg_shorty == 'F' || arg_shorty == 'D' || arg_shorty == 'L') {
llvm::Type* arg_type =
irb_.getJType(shorty[i], kAccurate)->getPointerTo();
llvm::Value* arg_jvalue_addr =
irb_.CreateConstGEP1_32(actual_args_array_addr, i - 1);
llvm::Value* arg_addr = irb_.CreateBitCast(arg_jvalue_addr, arg_type);
args.push_back(irb_.CreateLoad(arg_addr));
} else {
LOG(FATAL) << "Unexpected arg shorty for invoke stub: " << shorty[i];
}
}
// Invoke managed method now!
llvm::Value* code_field_offset_value =
irb_.getPtrEquivInt(Method::GetCodeOffset().Int32Value());
llvm::Value* code_field_addr =
irb_.CreatePtrDisp(method_object_addr, code_field_offset_value,
accurate_func_type->getPointerTo()->getPointerTo());
llvm::Value* code_addr = irb_.CreateLoad(code_field_addr);
llvm::Value* retval = irb_.CreateCall(code_addr, args);
// Store the returned value
if (shorty[0] != 'V') {
llvm::Value* ret_addr =
irb_.CreateBitCast(retval_addr, accurate_ret_type->getPointerTo());
irb_.CreateStore(retval, ret_addr);
}
irb_.CreateRetVoid();
// Verify the generated function
llvm::verifyFunction(*func, llvm::PrintMessageAction);
// Add the memory usage approximation of the compilation unit
cunit_->AddMemUsageApproximation((shorty_size * 3 + 8) * 500);
// NOTE: We will emit 3 LLVM instructions per shorty for the argument,
// plus 3 for pointer arithmetic, and 5 for code_addr, retval, ret_addr,
// store ret_addr, and ret_void. Beside, we guess that we have to use
// 50 bytes to represent one LLVM instruction.
return new CompiledInvokeStub(cunit_->GetElfIndex());
}
} // namespace compiler_llvm
} // namespace art
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