/*

 * Copyright 2008, 2009, 2010 Red Hat, Inc.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

using namespace llvm;

SharkBuilder::SharkBuilder(SharkCodeBuffer* code_buffer)

  : IRBuilder<>(SharkContext::current()),

    _code_buffer(code_buffer) {

}

// Helpers for accessing structures

Value* SharkBuilder::CreateAddressOfStructEntry(Value*      base,

                                                ByteSize    offset,

                                                const Type* type,

                                                const char* name) {

  return CreateBitCast(CreateStructGEP(base, in_bytes(offset)), type, name);

}

LoadInst* SharkBuilder::CreateValueOfStructEntry(Value*      base,

                                                 ByteSize    offset,

                                                 const Type* type,

                                                 const char* name) {

  return CreateLoad(

    CreateAddressOfStructEntry(

      base, offset, PointerType::getUnqual(type)),

    name);

}

// Helpers for accessing arrays

LoadInst* SharkBuilder::CreateArrayLength(Value* arrayoop) {

  return CreateValueOfStructEntry(

    arrayoop, in_ByteSize(arrayOopDesc::length_offset_in_bytes()),

    SharkType::jint_type(), "length");

}

Value* SharkBuilder::CreateArrayAddress(Value*      arrayoop,

                                        const Type* element_type,

                                        int         element_bytes,

                                        ByteSize    base_offset,

                                        Value*      index,

                                        const char* name) {

  Value* offset = CreateIntCast(index, SharkType::intptr_type(), false);

  if (element_bytes != 1)

    offset = CreateShl(

      offset,

      LLVMValue::intptr_constant(exact_log2(element_bytes)));

  offset = CreateAdd(

    LLVMValue::intptr_constant(in_bytes(base_offset)), offset);

  return CreateIntToPtr(

    CreateAdd(CreatePtrToInt(arrayoop, SharkType::intptr_type()), offset),

    PointerType::getUnqual(element_type),

    name);

}

Value* SharkBuilder::CreateArrayAddress(Value*      arrayoop,

                                        BasicType   basic_type,

                                        ByteSize    base_offset,

                                        Value*      index,

                                        const char* name) {

  return CreateArrayAddress(

    arrayoop,

    SharkType::to_arrayType(basic_type),

    type2aelembytes(basic_type),

    base_offset, index, name);

}

Value* SharkBuilder::CreateArrayAddress(Value*      arrayoop,

                                        BasicType   basic_type,

                                        Value*      index,

                                        const char* name) {

  return CreateArrayAddress(

    arrayoop, basic_type,

    in_ByteSize(arrayOopDesc::base_offset_in_bytes(basic_type)),

    index, name);

}

// Helpers for creating intrinsics and external functions.

const Type* SharkBuilder::make_type(char type, bool void_ok) {

  switch (type) {

    // Primitive types

  case 'c':

    return SharkType::jbyte_type();

  case 'i':

    return SharkType::jint_type();

  case 'l':

    return SharkType::jlong_type();

  case 'x':

    return SharkType::intptr_type();

  case 'f':

    return SharkType::jfloat_type();

  case 'd':

    return SharkType::jdouble_type();

    // Pointers to primitive types

  case 'C':

  case 'I':

  case 'L':

  case 'X':

  case 'F':

  case 'D':

    return PointerType::getUnqual(make_type(tolower(type), false));

    // VM objects

  case 'T':

    return SharkType::thread_type();

  case 'M':

    return PointerType::getUnqual(SharkType::monitor_type());

  case 'O':

    return SharkType::oop_type();

    // Miscellaneous

  case 'v':

    assert(void_ok, "should be");

    return SharkType::void_type();

  case '1':

    return SharkType::bit_type();

  default:

    ShouldNotReachHere();

  }

}

const FunctionType* SharkBuilder::make_ftype(const char* params,

                                             const char* ret) {

  std::vector<const Type*> param_types;

  for (const char* c = params; *c; c++)

    param_types.push_back(make_type(*c, false));

  assert(strlen(ret) == 1, "should be");

  const Type *return_type = make_type(*ret, true);

  return FunctionType::get(return_type, param_types, false);

}

// Create an object representing an intrinsic or external function by

// referencing the symbol by name.  This is the LLVM-style approach,

// but it cannot be used on functions within libjvm.so its symbols

// are not exported.  Note that you cannot make this work simply by

// exporting the symbols, as some symbols have the same names as

// symbols in the standard libraries (eg, atan2, fabs) and would

// obscure them were they visible.

Value* SharkBuilder::make_function(const char* name,

                                   const char* params,

                                   const char* ret) {

  return SharkContext::current().get_external(name, make_ftype(params, ret));

}

// Create an object representing an external function by inlining a

// function pointer in the code.  This is not the LLVM way, but it's

// the only way to access functions in libjvm.so and functions like

// __kernel_dmb on ARM which is accessed via an absolute address.

Value* SharkBuilder::make_function(address     func,

                                   const char* params,

                                   const char* ret) {

  return CreateIntToPtr(

    LLVMValue::intptr_constant((intptr_t) func),

    PointerType::getUnqual(make_ftype(params, ret)));

}

// VM calls

Value* SharkBuilder::find_exception_handler() {

  return make_function(

    (address) SharkRuntime::find_exception_handler, "TIi", "i");

}

Value* SharkBuilder::monitorenter() {

  return make_function((address) SharkRuntime::monitorenter, "TM", "v");

}

Value* SharkBuilder::monitorexit() {

  return make_function((address) SharkRuntime::monitorexit, "TM", "v");

}

Value* SharkBuilder::new_instance() {

  return make_function((address) SharkRuntime::new_instance, "Ti", "v");

}

Value* SharkBuilder::newarray() {

  return make_function((address) SharkRuntime::newarray, "Tii", "v");

}

Value* SharkBuilder::anewarray() {

  return make_function((address) SharkRuntime::anewarray, "Tii", "v");

}

Value* SharkBuilder::multianewarray() {

  return make_function((address) SharkRuntime::multianewarray, "TiiI", "v");

}

Value* SharkBuilder::register_finalizer() {

  return make_function((address) SharkRuntime::register_finalizer, "TO", "v");

}

Value* SharkBuilder::safepoint() {

  return make_function((address) SafepointSynchronize::block, "T", "v");

}

Value* SharkBuilder::throw_ArithmeticException() {

  return make_function(

    (address) SharkRuntime::throw_ArithmeticException, "TCi", "v");

}

Value* SharkBuilder::throw_ArrayIndexOutOfBoundsException() {

  return make_function(

    (address) SharkRuntime::throw_ArrayIndexOutOfBoundsException, "TCii", "v");

}

Value* SharkBuilder::throw_ClassCastException() {

  return make_function(

    (address) SharkRuntime::throw_ClassCastException, "TCi", "v");

}

Value* SharkBuilder::throw_NullPointerException() {

  return make_function(

    (address) SharkRuntime::throw_NullPointerException, "TCi", "v");

}

// High-level non-VM calls

Value* SharkBuilder::f2i() {

  return make_function((address) SharedRuntime::f2i, "f", "i");

}

Value* SharkBuilder::f2l() {

  return make_function((address) SharedRuntime::f2l, "f", "l");

}

Value* SharkBuilder::d2i() {

  return make_function((address) SharedRuntime::d2i, "d", "i");

}

Value* SharkBuilder::d2l() {

  return make_function((address) SharedRuntime::d2l, "d", "l");

}

Value* SharkBuilder::is_subtype_of() {

  return make_function((address) SharkRuntime::is_subtype_of, "OO", "c");

}

Value* SharkBuilder::current_time_millis() {

  return make_function((address) os::javaTimeMillis, "", "l");

}

Value* SharkBuilder::sin() {

  return make_function("llvm.sin.f64", "d", "d");

}

Value* SharkBuilder::cos() {

  return make_function("llvm.cos.f64", "d", "d");

}

Value* SharkBuilder::tan() {

  return make_function((address) ::tan, "d", "d");

}

Value* SharkBuilder::atan2() {

  return make_function((address) ::atan2, "dd", "d");

}

Value* SharkBuilder::sqrt() {

  return make_function("llvm.sqrt.f64", "d", "d");

}

Value* SharkBuilder::log() {

  return make_function("llvm.log.f64", "d", "d");

}

Value* SharkBuilder::log10() {

  return make_function("llvm.log10.f64", "d", "d");

}

Value* SharkBuilder::pow() {

  return make_function("llvm.pow.f64", "dd", "d");

}

Value* SharkBuilder::exp() {

  return make_function("llvm.exp.f64", "d", "d");

}

Value* SharkBuilder::fabs() {

  return make_function((address) ::fabs, "d", "d");

}

Value* SharkBuilder::unsafe_field_offset_to_byte_offset() {

  extern jlong Unsafe_field_offset_to_byte_offset(jlong field_offset);

  return make_function((address) Unsafe_field_offset_to_byte_offset, "l", "l");

}

Value* SharkBuilder::osr_migration_end() {

  return make_function((address) SharedRuntime::OSR_migration_end, "C", "v");

}

// Semi-VM calls

Value* SharkBuilder::throw_StackOverflowError() {

  return make_function((address) ZeroStack::handle_overflow, "T", "v");

}

Value* SharkBuilder::uncommon_trap() {

  return make_function((address) SharkRuntime::uncommon_trap, "Ti", "i");

}

Value* SharkBuilder::deoptimized_entry_point() {

  return make_function((address) CppInterpreter::main_loop, "iT", "v");

}

// Native-Java transition

Value* SharkBuilder::check_special_condition_for_native_trans() {

  return make_function(

    (address) JavaThread::check_special_condition_for_native_trans,

    "T", "v");

}

// Low-level non-VM calls

// The ARM-specific code here is to work around unimplemented

// atomic exchange and memory barrier intrinsics in LLVM.

//

// Delegating to external functions for these would normally

// incur a speed penalty, but Linux on ARM is a special case

// in that atomic operations on that platform are handled by

// external functions anyway.  It would be *preferable* for

// the calls to be hidden away in LLVM, but it's not hurting

// performance so having the calls here is acceptable.

//

// If you are building Shark on a platform without atomic

// exchange and/or memory barrier intrinsics then it is only

// acceptable to mimic this approach if your platform cannot

// perform these operations without delegating to a function.

#ifdef ARM

static jint zero_cmpxchg_int(volatile jint *ptr, jint oldval, jint newval) {

  return Atomic::cmpxchg(newval, ptr, oldval);

}

#endif // ARM

Value* SharkBuilder::cmpxchg_int() {

  return make_function(

#ifdef ARM

    (address) zero_cmpxchg_int,

#else

    "llvm.atomic.cmp.swap.i32.p0i32",

#endif // ARM

    "Iii", "i");

}

#ifdef ARM

static intptr_t zero_cmpxchg_ptr(volatile intptr_t* ptr,

                                 intptr_t           oldval,

                                 intptr_t           newval) {

  return Atomic::cmpxchg_ptr(newval, ptr, oldval);

}

#endif // ARM

Value* SharkBuilder::cmpxchg_ptr() {

  return make_function(

#ifdef ARM

    (address) zero_cmpxchg_ptr,

#else

    "llvm.atomic.cmp.swap.i" LP64_ONLY("64") NOT_LP64("32") ".p0i" LP64_ONLY("64") NOT_LP64("32"),

#endif // ARM

    "Xxx", "x");

}

Value* SharkBuilder::frame_address() {

  return make_function("llvm.frameaddress", "i", "C");

}

Value* SharkBuilder::memory_barrier() {

  return make_function(

#ifdef ARM

    (address) 0xffff0fa0, // __kernel_dmb

#else

    "llvm.memory.barrier",

#endif // ARM

    "11111", "v");

}

Value* SharkBuilder::memset() {

#if SHARK_LLVM_VERSION >= 28

  // LLVM 2.8 added a fifth isVolatile field for memset

  // introduced with LLVM r100304

  return make_function("llvm.memset.i32", "Cciii", "v");

#else

  return make_function("llvm.memset.i32", "Ccii", "v");

#endif

}

Value* SharkBuilder::unimplemented() {

  return make_function((address) report_unimplemented, "Ci", "v");

}

Value* SharkBuilder::should_not_reach_here() {

  return make_function((address) report_should_not_reach_here, "Ci", "v");

}

Value* SharkBuilder::dump() {

  return make_function((address) SharkRuntime::dump, "Cx", "v");

}

// Public interface to low-level non-VM calls

CallInst* SharkBuilder::CreateCmpxchgInt(Value* exchange_value,

                                         Value* dst,

                                         Value* compare_value) {

  return CreateCall3(cmpxchg_int(), dst, compare_value, exchange_value);

}

CallInst* SharkBuilder::CreateCmpxchgPtr(Value* exchange_value,

                                         Value* dst,

                                         Value* compare_value) {

  return CreateCall3(cmpxchg_ptr(), dst, compare_value, exchange_value);

}

CallInst* SharkBuilder::CreateGetFrameAddress() {

  return CreateCall(frame_address(), LLVMValue::jint_constant(0));

}

CallInst *SharkBuilder::CreateMemoryBarrier(int flags) {

  Value *args[] = {

    LLVMValue::bit_constant((flags & BARRIER_LOADLOAD) ? 1 : 0),

    LLVMValue::bit_constant((flags & BARRIER_LOADSTORE) ? 1 : 0),

    LLVMValue::bit_constant((flags & BARRIER_STORELOAD) ? 1 : 0),

    LLVMValue::bit_constant((flags & BARRIER_STORESTORE) ? 1 : 0),

    LLVMValue::bit_constant(1)};

  return CreateCall(memory_barrier(), args, args + 5);

}

CallInst* SharkBuilder::CreateMemset(Value* dst,

                                     Value* value,

                                     Value* len,

                                     Value* align) {

#if SHARK_LLVM_VERSION >= 28

  return CreateCall5(memset(), dst, value, len, align,

                     LLVMValue::jint_constant(0));

#else

  return CreateCall4(memset(), dst, value, len, align);

#endif

}

CallInst* SharkBuilder::CreateUnimplemented(const char* file, int line) {

  return CreateCall2(

    unimplemented(),

    CreateIntToPtr(

      LLVMValue::intptr_constant((intptr_t) file),

      PointerType::getUnqual(SharkType::jbyte_type())),

    LLVMValue::jint_constant(line));

}

CallInst* SharkBuilder::CreateShouldNotReachHere(const char* file, int line) {

  return CreateCall2(

    should_not_reach_here(),

    CreateIntToPtr(

      LLVMValue::intptr_constant((intptr_t) file),

      PointerType::getUnqual(SharkType::jbyte_type())),

    LLVMValue::jint_constant(line));

}

#ifndef PRODUCT

CallInst* SharkBuilder::CreateDump(Value* value) {

  const char *name;

  if (value->hasName())

    // XXX this leaks, but it's only debug code

    name = strdup(value->getName().str().c_str());

  else

    name = "unnamed_value";

  if (isa<PointerType>(value->getType()))

    value = CreatePtrToInt(value, SharkType::intptr_type());

  else if (value->getType()->

#if SHARK_LLVM_VERSION >= 27

           isIntegerTy()

#else

           isInteger()

#endif

           )

    value = CreateIntCast(value, SharkType::intptr_type(), false);

  else

    Unimplemented();

  return CreateCall2(

    dump(),

    CreateIntToPtr(

      LLVMValue::intptr_constant((intptr_t) name),

      PointerType::getUnqual(SharkType::jbyte_type())),