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/*
* Copyright (C) 2014 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_RUNTIME_IMPLICIT_CHECK_OPTIONS_H_
#define ART_RUNTIME_IMPLICIT_CHECK_OPTIONS_H_
#include "gc/heap.h"
#include "gc/space/image_space.h"
#include "instruction_set.h"
#include "runtime.h"
#include <string>
namespace art {
class ImplicitCheckOptions {
public:
static constexpr const char* kImplicitChecksOatHeaderKey = "implicit-checks";
static std::string Serialize(bool explicit_null_checks, bool explicit_stack_overflow_checks,
bool explicit_suspend_checks) {
char tmp[4];
tmp[0] = explicit_null_checks ? 'N' : 'n';
tmp[1] = explicit_stack_overflow_checks ? 'O' : 'o';
tmp[2] = explicit_suspend_checks ? 'S' : 's';
tmp[3] = 0;
return std::string(tmp);
}
static bool Parse(const char* str, bool* explicit_null_checks,
bool* explicit_stack_overflow_checks, bool* explicit_suspend_checks) {
if (str != nullptr && str[0] != 0 && str[1] != 0 && str[2] != 0 &&
(str[0] == 'n' || str[0] == 'N') &&
(str[1] == 'o' || str[1] == 'O') &&
(str[2] == 's' || str[2] == 'S')) {
*explicit_null_checks = str[0] == 'N';
*explicit_stack_overflow_checks = str[1] == 'O';
*explicit_suspend_checks = str[2] == 'S';
return true;
} else {
return false;
}
}
// Check whether the given flags are correct with respect to the current runtime and the given
// executable flag.
static bool CheckRuntimeSupport(bool executable, bool explicit_null_checks,
bool explicit_stack_overflow_checks,
bool explicit_suspend_checks, std::string* error_msg) {
if (!executable) {
// Not meant to be run, i.e., either we are compiling or dumping. Just accept.
return true;
}
Runtime* runtime = Runtime::Current();
// We really should have a runtime.
DCHECK_NE(static_cast<Runtime*>(nullptr), runtime);
if (runtime->GetInstrumentation()->IsForcedInterpretOnly()) {
// We are an interpret-only environment. Ignore the check value.
return true;
}
if (runtime->ExplicitNullChecks() != explicit_null_checks ||
runtime->ExplicitStackOverflowChecks() != explicit_stack_overflow_checks ||
runtime->ExplicitSuspendChecks() != explicit_suspend_checks) {
if (error_msg != nullptr) {
// Create an error message.
std::ostringstream os;
os << "Explicit check options do not match runtime: ";
os << runtime->ExplicitNullChecks() << " vs " << explicit_null_checks << " | ";
os << runtime->ExplicitStackOverflowChecks() << " vs " << explicit_stack_overflow_checks
<< " | ";
os << runtime->ExplicitSuspendChecks() << " vs " << explicit_suspend_checks;
*error_msg = os.str();
}
// Currently we do not create correct images when pre-opting, so the emulator will fail with
// this change. Once the change is in the tree, REMOVE.
if (true) {
// At least try to log it, though.
if (error_msg != nullptr) {
LOG(WARNING) << *error_msg;
}
return true;
} else {
return false;
}
}
// Accepted.
return true;
}
// Check (and override) the flags depending on current support in the ISA.
// Right now will reset all flags to explicit except on ARM.
static void CheckISASupport(InstructionSet isa, bool* explicit_null_checks,
bool* explicit_stack_overflow_checks, bool* explicit_suspend_checks) {
switch (isa) {
case kArm:
case kThumb2:
break; // All checks implemented, leave as is.
default: // No checks implemented, reset all to explicit checks.
*explicit_null_checks = true;
*explicit_stack_overflow_checks = true;
*explicit_suspend_checks = true;
}
}
static bool CheckForCompiling(InstructionSet host, InstructionSet target,
bool* explicit_null_checks, bool* explicit_stack_overflow_checks,
bool* explicit_suspend_checks) {
// Check the boot image settings.
Runtime* runtime = Runtime::Current();
if (runtime != nullptr) {
gc::space::ImageSpace* ispace = runtime->GetHeap()->GetImageSpace();
if (ispace != nullptr) {
const OatFile* oat_file = ispace->GetOatFile();
if (oat_file != nullptr) {
const char* v = oat_file->GetOatHeader().GetStoreValueByKey(kImplicitChecksOatHeaderKey);
if (!Parse(v, explicit_null_checks, explicit_stack_overflow_checks,
explicit_suspend_checks)) {
LOG(FATAL) << "Should have been able to parse boot image implicit check values";
}
return true;
}
}
}
// Check the current runtime.
bool cross_compiling = true;
switch (host) {
case kArm:
case kThumb2:
cross_compiling = target != kArm && target != kThumb2;
break;
default:
cross_compiling = host != target;
break;
}
if (!cross_compiling) {
Runtime* runtime = Runtime::Current();
*explicit_null_checks = runtime->ExplicitNullChecks();
*explicit_stack_overflow_checks = runtime->ExplicitStackOverflowChecks();
*explicit_suspend_checks = runtime->ExplicitSuspendChecks();
return true;
}
// Give up.
return false;
}
};
} // namespace art
#endif // ART_RUNTIME_IMPLICIT_CHECK_OPTIONS_H_
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