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// Copyright 2011 Google Inc. All Rights Reserved.
#include "calling_convention.h"
#include "calling_convention_arm.h"
#include "calling_convention_x86.h"
#include "logging.h"
#include "utils.h"
namespace art {
// Offset of Method within the frame
FrameOffset CallingConvention::MethodStackOffset() {
return displacement_;
}
// Managed runtime calling convention
ManagedRuntimeCallingConvention* ManagedRuntimeCallingConvention::Create(
Method* native_method, InstructionSet instruction_set) {
if (instruction_set == kX86) {
return new x86::X86ManagedRuntimeCallingConvention(native_method);
} else {
CHECK(instruction_set == kArm || instruction_set == kThumb2);
return new arm::ArmManagedRuntimeCallingConvention(native_method);
}
}
size_t ManagedRuntimeCallingConvention::FrameSize() {
return GetMethod()->GetFrameSizeInBytes();
}
bool ManagedRuntimeCallingConvention::HasNext() {
return itr_args_ < GetMethod()->NumArgs();
}
void ManagedRuntimeCallingConvention::Next() {
CHECK(HasNext());
if (IsCurrentArgExplicit() && // don't query parameter type of implicit args
GetMethod()->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 GetMethod()->IsStatic() || (itr_args_ != 0);
}
bool ManagedRuntimeCallingConvention::IsCurrentArgPossiblyNull() {
return IsCurrentArgExplicit(); // any user parameter may be null
}
size_t ManagedRuntimeCallingConvention::CurrentParamSize() {
return GetMethod()->ParamSize(itr_args_);
}
bool ManagedRuntimeCallingConvention::IsCurrentParamAReference() {
return GetMethod()->IsParamAReference(itr_args_);
}
// JNI calling convention
JniCallingConvention* JniCallingConvention::Create(Method* native_method,
InstructionSet instruction_set) {
if (instruction_set == kX86) {
return new x86::X86JniCallingConvention(native_method);
} else {
CHECK(instruction_set == kArm || instruction_set == kThumb2);
return new arm::ArmJniCallingConvention(native_method);
}
}
size_t JniCallingConvention::ReferenceCount() {
const Method* method = GetMethod();
return method->NumReferenceArgs() + (method->IsStatic() ? 1 : 0);
}
FrameOffset JniCallingConvention::ReturnValueSaveLocation() {
size_t start_of_sirt = SirtLinkOffset().Int32Value() + kPointerSize;
size_t references_size = kPointerSize * ReferenceCount(); // size excluding header
return FrameOffset(start_of_sirt + references_size);
}
bool JniCallingConvention::HasNext() {
if (itr_args_ <= kObjectOrClass) {
return true;
} else {
unsigned int arg_pos = itr_args_ - NumberOfExtraArgumentsForJni(GetMethod());
return arg_pos < GetMethod()->NumArgs();
}
}
void JniCallingConvention::Next() {
CHECK(HasNext());
if (itr_args_ > kObjectOrClass) {
int arg_pos = itr_args_ - NumberOfExtraArgumentsForJni(GetMethod());
if (GetMethod()->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(GetMethod());
return GetMethod()->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(GetMethod());
return GetMethod()->ParamSize(arg_pos);
}
}
size_t JniCallingConvention::NumberOfExtraArgumentsForJni(Method* method) {
// The first argument is the JNIEnv*.
// Static methods have an extra argument which is the jclass.
return method->IsStatic() ? 2 : 1;
}
} // namespace art
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