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/*
* Copyright (C) 2011 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 "calling_convention.h"
#include "base/logging.h"
#include "jni/quick/arm/calling_convention_arm.h"
#include "jni/quick/mips/calling_convention_mips.h"
#include "jni/quick/x86/calling_convention_x86.h"
#include "utils.h"
namespace art {
// Offset of Method within the frame
FrameOffset CallingConvention::MethodStackOffset() {
return displacement_;
}
// Managed runtime calling convention
ManagedRuntimeCallingConvention* ManagedRuntimeCallingConvention::Create(
bool is_static, bool is_synchronized, const char* shorty, InstructionSet instruction_set) {
switch (instruction_set) {
case kArm:
case kThumb2:
return new arm::ArmManagedRuntimeCallingConvention(is_static, is_synchronized, shorty);
case kMips:
return new mips::MipsManagedRuntimeCallingConvention(is_static, is_synchronized, shorty);
case kX86:
return new x86::X86ManagedRuntimeCallingConvention(is_static, is_synchronized, shorty);
default:
LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
return NULL;
}
}
bool ManagedRuntimeCallingConvention::HasNext() {
return itr_args_ < NumArgs();
}
void ManagedRuntimeCallingConvention::Next() {
CHECK(HasNext());
if (IsCurrentArgExplicit() && // don't query parameter type of implicit args
IsParamALongOrDouble(itr_args_)) {
itr_longs_and_doubles_++;
itr_slots_++;
}
if (IsCurrentParamAReference()) {
itr_refs_++;
}
itr_args_++;
itr_slots_++;
}
bool ManagedRuntimeCallingConvention::IsCurrentArgExplicit() {
// Static methods have no implicit arguments, others implicitly pass this
return IsStatic() || (itr_args_ != 0);
}
bool ManagedRuntimeCallingConvention::IsCurrentArgPossiblyNull() {
return IsCurrentArgExplicit(); // any user parameter may be null
}
size_t ManagedRuntimeCallingConvention::CurrentParamSize() {
return ParamSize(itr_args_);
}
bool ManagedRuntimeCallingConvention::IsCurrentParamAReference() {
return IsParamAReference(itr_args_);
}
// JNI calling convention
JniCallingConvention* JniCallingConvention::Create(bool is_static, bool is_synchronized,
const char* shorty,
InstructionSet instruction_set) {
switch (instruction_set) {
case kArm:
case kThumb2:
return new arm::ArmJniCallingConvention(is_static, is_synchronized, shorty);
case kMips:
return new mips::MipsJniCallingConvention(is_static, is_synchronized, shorty);
case kX86:
return new x86::X86JniCallingConvention(is_static, is_synchronized, shorty);
default:
LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
return NULL;
}
}
size_t JniCallingConvention::ReferenceCount() const {
return NumReferenceArgs() + (IsStatic() ? 1 : 0);
}
FrameOffset JniCallingConvention::SavedLocalReferenceCookieOffset() const {
size_t start_of_sirt = SirtLinkOffset().Int32Value() + kPointerSize;
size_t references_size = kPointerSize * ReferenceCount(); // size excluding header
return FrameOffset(start_of_sirt + references_size);
}
FrameOffset JniCallingConvention::ReturnValueSaveLocation() const {
// Segment state is 4 bytes long
return FrameOffset(SavedLocalReferenceCookieOffset().Int32Value() + 4);
}
bool JniCallingConvention::HasNext() {
if (itr_args_ <= kObjectOrClass) {
return true;
} else {
unsigned int arg_pos = itr_args_ - NumberOfExtraArgumentsForJni();
return arg_pos < NumArgs();
}
}
void JniCallingConvention::Next() {
CHECK(HasNext());
if (itr_args_ > kObjectOrClass) {
int arg_pos = itr_args_ - NumberOfExtraArgumentsForJni();
if (IsParamALongOrDouble(arg_pos)) {
itr_longs_and_doubles_++;
itr_slots_++;
}
}
if (IsCurrentParamAReference()) {
itr_refs_++;
}
itr_args_++;
itr_slots_++;
}
bool JniCallingConvention::IsCurrentParamAReference() {
switch (itr_args_) {
case kJniEnv:
return false; // JNIEnv*
case kObjectOrClass:
return true; // jobject or jclass
default: {
int arg_pos = itr_args_ - NumberOfExtraArgumentsForJni();
return IsParamAReference(arg_pos);
}
}
}
// Return position of SIRT entry holding reference at the current iterator
// position
FrameOffset JniCallingConvention::CurrentParamSirtEntryOffset() {
CHECK(IsCurrentParamAReference());
CHECK_GT(SirtLinkOffset(), SirtNumRefsOffset());
// Address of 1st SIRT entry
int result = SirtLinkOffset().Int32Value() + kPointerSize;
result += itr_refs_ * kPointerSize;
CHECK_GT(result, SirtLinkOffset().Int32Value());
return FrameOffset(result);
}
size_t JniCallingConvention::CurrentParamSize() {
if (itr_args_ <= kObjectOrClass) {
return kPointerSize; // JNIEnv or jobject/jclass
} else {
int arg_pos = itr_args_ - NumberOfExtraArgumentsForJni();
return ParamSize(arg_pos);
}
}
size_t JniCallingConvention::NumberOfExtraArgumentsForJni() {
// The first argument is the JNIEnv*.
// Static methods have an extra argument which is the jclass.
return IsStatic() ? 2 : 1;
}
} // namespace art
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