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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.
*/
#ifndef ART_SRC_CALLING_CONVENTION_H_
#define ART_SRC_CALLING_CONVENTION_H_
#include <vector>
#include "managed_register.h"
#include "stack_indirect_reference_table.h"
#include "thread.h"
namespace art {
// Top-level abstraction for different calling conventions
class CallingConvention {
public:
bool IsReturnAReference() const { return shorty_[0] == 'L'; }
size_t SizeOfReturnValue() const {
size_t result = Primitive::ComponentSize(Primitive::GetType(shorty_[0]));
if (result >= 1 && result < 4) {
result = 4;
}
return result;
}
// Register that holds result of this method
virtual ManagedRegister ReturnRegister() = 0;
// Register reserved for scratch usage during procedure calls
virtual ManagedRegister InterproceduralScratchRegister() = 0;
// Offset of Method within the frame
FrameOffset MethodStackOffset();
// Iterator interface
// Place iterator at start of arguments. The displacement is applied to
// frame offset methods to account for frames which may be on the stack
// below the one being iterated over.
void ResetIterator(FrameOffset displacement) {
displacement_ = displacement;
itr_slots_ = 0;
itr_args_ = 0;
itr_refs_ = 0;
itr_longs_and_doubles_ = 0;
}
virtual ~CallingConvention() {}
protected:
CallingConvention(bool is_static, bool is_synchronized, const char* shorty)
: displacement_(0), is_static_(is_static), is_synchronized_(is_synchronized),
shorty_(shorty) {
num_args_ = (is_static ? 0 : 1) + strlen(shorty) - 1;
num_ref_args_ = is_static ? 0 : 1; // The implicit this pointer.
num_long_or_double_args_ = 0;
for (size_t i = 1; i < strlen(shorty); i++) {
char ch = shorty_[i];
if (ch == 'L') {
num_ref_args_++;
} else if ((ch == 'D') || (ch == 'J')) {
num_long_or_double_args_++;
}
}
}
bool IsStatic() const {
return is_static_;
}
bool IsSynchronized() const {
return is_synchronized_;
}
bool IsParamALongOrDouble(unsigned int param) const {
DCHECK_LT(param, NumArgs());
if (IsStatic()) {
param++; // 0th argument must skip return value at start of the shorty
} else if (param == 0) {
return false; // this argument
}
char ch = shorty_[param];
return (ch == 'J' || ch == 'D');
}
bool IsParamAReference(unsigned int param) const {
DCHECK_LT(param, NumArgs());
if (IsStatic()) {
param++; // 0th argument must skip return value at start of the shorty
} else if (param == 0) {
return true; // this argument
}
return shorty_[param] == 'L';
}
size_t NumArgs() const {
return num_args_;
}
size_t NumLongOrDoubleArgs() const {
return num_long_or_double_args_;
}
size_t NumReferenceArgs() const {
return num_ref_args_;
}
size_t ParamSize(unsigned int param) const {
DCHECK_LT(param, NumArgs());
if (IsStatic()) {
param++; // 0th argument must skip return value at start of the shorty
} else if (param == 0) {
return kPointerSize; // this argument
}
size_t result = Primitive::ComponentSize(Primitive::GetType(shorty_[param]));
if (result >= 1 && result < 4) {
result = 4;
}
return result;
}
const char* GetShorty() const {
return shorty_.c_str();
}
// The slot number for current calling_convention argument.
// Note that each slot is 32-bit. When the current argument is bigger
// than 32 bits, return the first slot number for this argument.
unsigned int itr_slots_;
// The number of references iterated past
unsigned int itr_refs_;
// The argument number along argument list for current argument
unsigned int itr_args_;
// Number of longs and doubles seen along argument list
unsigned int itr_longs_and_doubles_;
// Space for frames below this on the stack
FrameOffset displacement_;
private:
const bool is_static_;
const bool is_synchronized_;
std::string shorty_;
size_t num_args_;
size_t num_ref_args_;
size_t num_long_or_double_args_;
};
// Abstraction for managed code's calling conventions
// | { Incoming stack args } |
// | { Prior Method* } | <-- Prior SP
// | { Return address } |
// | { Callee saves } |
// | { Spills ... } |
// | { Outgoing stack args } |
// | { Method* } | <-- SP
class ManagedRuntimeCallingConvention : public CallingConvention {
public:
static ManagedRuntimeCallingConvention* Create(bool is_static, bool is_synchronized,
const char* shorty,
InstructionSet instruction_set);
// Register that holds the incoming method argument
virtual ManagedRegister MethodRegister() = 0;
// Iterator interface
bool HasNext();
void Next();
bool IsCurrentParamAReference();
bool IsCurrentArgExplicit(); // ie a non-implict argument such as this
bool IsCurrentArgPossiblyNull();
size_t CurrentParamSize();
virtual bool IsCurrentParamInRegister() = 0;
virtual bool IsCurrentParamOnStack() = 0;
virtual ManagedRegister CurrentParamRegister() = 0;
virtual FrameOffset CurrentParamStackOffset() = 0;
virtual ~ManagedRuntimeCallingConvention() {}
// Registers to spill to caller's out registers on entry.
virtual const std::vector<ManagedRegister>& EntrySpills() = 0;
protected:
ManagedRuntimeCallingConvention(bool is_static, bool is_synchronized, const char* shorty) :
CallingConvention(is_static, is_synchronized, shorty) {}
};
// Abstraction for JNI calling conventions
// | { Incoming stack args } | <-- Prior SP
// | { Return address } |
// | { Callee saves } | ([1])
// | { Return value spill } | (live on return slow paths)
// | { Local Ref. Table State } |
// | { Stack Indirect Ref. Table |
// | num. refs./link } | (here to prior SP is frame size)
// | { Method* } | <-- Anchor SP written to thread
// | { Outgoing stack args } | <-- SP at point of call
// | Native frame |
//
// [1] We must save all callee saves here to enable any exception throws to restore
// callee saves for frames above this one.
class JniCallingConvention : public CallingConvention {
public:
static JniCallingConvention* Create(bool is_static, bool is_synchronized, const char* shorty,
InstructionSet instruction_set);
// Size of frame excluding space for outgoing args (its assumed Method* is
// always at the bottom of a frame, but this doesn't work for outgoing
// native args). Includes alignment.
virtual size_t FrameSize() = 0;
// Size of outgoing arguments, including alignment
virtual size_t OutArgSize() = 0;
// Number of references in stack indirect reference table
size_t ReferenceCount() const;
// Location where the segment state of the local indirect reference table is saved
FrameOffset SavedLocalReferenceCookieOffset() const;
// Location where the return value of a call can be squirreled if another
// call is made following the native call
FrameOffset ReturnValueSaveLocation() const;
// Callee save registers to spill prior to native code (which may clobber)
virtual const std::vector<ManagedRegister>& CalleeSaveRegisters() const = 0;
// Spill mask values
virtual uint32_t CoreSpillMask() const = 0;
virtual uint32_t FpSpillMask() const = 0;
// Returns true if the method register will have been clobbered during argument
// set up
virtual bool IsMethodRegisterClobberedPreCall() = 0;
// An extra scratch register live after the call
virtual ManagedRegister ReturnScratchRegister() const = 0;
// Iterator interface
bool HasNext();
virtual void Next();
bool IsCurrentParamAReference();
size_t CurrentParamSize();
virtual bool IsCurrentParamInRegister() = 0;
virtual bool IsCurrentParamOnStack() = 0;
virtual ManagedRegister CurrentParamRegister() = 0;
virtual FrameOffset CurrentParamStackOffset() = 0;
// Iterator interface extension for JNI
FrameOffset CurrentParamSirtEntryOffset();
// Position of SIRT and interior fields
FrameOffset SirtOffset() const {
return FrameOffset(displacement_.Int32Value() +
kPointerSize); // above Method*
}
FrameOffset SirtNumRefsOffset() const {
return FrameOffset(SirtOffset().Int32Value() +
StackIndirectReferenceTable::NumberOfReferencesOffset());
}
FrameOffset SirtLinkOffset() const {
return FrameOffset(SirtOffset().Int32Value() +
StackIndirectReferenceTable::LinkOffset());
}
virtual ~JniCallingConvention() {}
protected:
// Named iterator positions
enum IteratorPos {
kJniEnv = 0,
kObjectOrClass = 1
};
explicit JniCallingConvention(bool is_static, bool is_synchronized, const char* shorty) :
CallingConvention(is_static, is_synchronized, shorty) {}
// Number of stack slots for outgoing arguments, above which the SIRT is
// located
virtual size_t NumberOfOutgoingStackArgs() = 0;
protected:
size_t NumberOfExtraArgumentsForJni();
};
} // namespace art
#endif // ART_SRC_CALLING_CONVENTION_H_