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// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/globals.h" // Needed here to get TARGET_ARCH_ARM64.
#if defined(TARGET_ARCH_ARM64)
#include "vm/code_patcher.h"
#include "vm/cpu.h"
#include "vm/instructions.h"
#include "vm/object.h"
namespace dart {
class PoolPointerCall : public ValueObject {
public:
PoolPointerCall(uword pc, const Code& code)
: end_(pc),
object_pool_(ObjectPool::Handle(code.GetObjectPool())) {
// Last instruction: blr ip0.
ASSERT(*(reinterpret_cast<uint32_t*>(end_) - 1) == 0xd63f0200);
InstructionPattern::DecodeLoadWordFromPool(
end_ - 2 * Instr::kInstrSize, &reg_, &index_);
}
intptr_t pp_index() const {
return index_;
}
RawCode* Target() const {
return reinterpret_cast<RawCode*>(object_pool_.ObjectAt(pp_index()));
}
void SetTarget(const Code& target) const {
object_pool_.SetObjectAt(pp_index(), target);
// No need to flush the instruction cache, since the code is not modified.
}
private:
static const int kCallPatternSize = 3 * Instr::kInstrSize;
uword end_;
const ObjectPool& object_pool_;
Register reg_;
intptr_t index_;
DISALLOW_IMPLICIT_CONSTRUCTORS(PoolPointerCall);
};
RawCode* CodePatcher::GetStaticCallTargetAt(uword return_address,
const Code& code) {
ASSERT(code.ContainsInstructionAt(return_address));
PoolPointerCall call(return_address, code);
return call.Target();
}
void CodePatcher::PatchStaticCallAt(uword return_address,
const Code& code,
const Code& new_target) {
PatchPoolPointerCallAt(return_address, code, new_target);
}
void CodePatcher::PatchPoolPointerCallAt(uword return_address,
const Code& code,
const Code& new_target) {
ASSERT(code.ContainsInstructionAt(return_address));
PoolPointerCall call(return_address, code);
call.SetTarget(new_target);
}
void CodePatcher::InsertDeoptimizationCallAt(uword start, uword target) {
// The inserted call should not overlap the lazy deopt jump code.
ASSERT(start + CallPattern::kDeoptCallLengthInBytes <= target);
CallPattern::InsertDeoptCallAt(start, target);
}
RawCode* CodePatcher::GetInstanceCallAt(uword return_address,
const Code& code,
ICData* ic_data) {
ASSERT(code.ContainsInstructionAt(return_address));
CallPattern call(return_address, code);
if (ic_data != NULL) {
*ic_data = call.IcData();
}
return call.TargetCode();
}
intptr_t CodePatcher::InstanceCallSizeInBytes() {
// The instance call instruction sequence has a variable size on ARM64.
UNREACHABLE();
return 0;
}
RawFunction* CodePatcher::GetUnoptimizedStaticCallAt(
uword return_address, const Code& code, ICData* ic_data_result) {
ASSERT(code.ContainsInstructionAt(return_address));
CallPattern static_call(return_address, code);
ICData& ic_data = ICData::Handle();
ic_data ^= static_call.IcData();
if (ic_data_result != NULL) {
*ic_data_result = ic_data.raw();
}
return ic_data.GetTargetAt(0);
}
void CodePatcher::PatchNativeCallAt(uword return_address,
const Code& code,
NativeFunction target,
const Code& trampoline) {
ASSERT(code.ContainsInstructionAt(return_address));
NativeCallPattern call(return_address, code);
call.set_target(trampoline);
call.set_native_function(target);
}
RawCode* CodePatcher::GetNativeCallAt(uword return_address,
const Code& code,
NativeFunction* target) {
ASSERT(code.ContainsInstructionAt(return_address));
NativeCallPattern call(return_address, code);
*target = call.native_function();
return call.target();
}
} // namespace dart
#endif // defined TARGET_ARCH_ARM64