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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 <stdio.h>
#include "UniquePtr.h"
#include "class_linker.h"
#include "dex_verifier.h"
#include "object.h"
#include "object_utils.h"
#include "jni.h"
namespace art {
#define REG(mh, reg_bitmap, reg) \
( ((reg) < mh.GetCodeItem()->registers_size_) && \
(( *((reg_bitmap) + (reg)/8) >> ((reg) % 8) ) & 0x01) )
#define CHECK_REGS(...) do { \
int t[] = {__VA_ARGS__}; \
int t_size = sizeof(t) / sizeof(*t); \
for (int i = 0; i < t_size; ++i) \
CHECK(REG(mh, reg_bitmap, t[i])) << "Error: Reg " << i << " is not in RegisterMap"; \
} while (false)
static int gJava_StackWalk_refmap_calls = 0;
struct ReferenceMapVisitor : public Thread::StackVisitor {
ReferenceMapVisitor() {
}
bool VisitFrame(const Frame& frame, uintptr_t pc) {
Method* m = frame.GetMethod();
CHECK(m != NULL);
LOG(INFO) << "At " << PrettyMethod(m, false);
if (m->IsCalleeSaveMethod() || m->IsNative()) {
LOG(WARNING) << "no PC for " << PrettyMethod(m);
CHECK_EQ(pc, 0u);
return true;
}
verifier::PcToReferenceMap map(m->GetGcMap(), m->GetGcMapLength());
const uint8_t* reg_bitmap = map.FindBitMap(m->ToDexPC(pc));
MethodHelper mh(m);
StringPiece m_name(mh.GetName());
// Given the method name and the number of times the method has been called,
// we know the Dex registers with live reference values. Assert that what we
// find is what is expected.
if (m_name == "f") {
if (gJava_StackWalk_refmap_calls == 1) {
CHECK_EQ(1U, m->ToDexPC(pc));
CHECK_REGS(1);
} else {
CHECK_EQ(gJava_StackWalk_refmap_calls, 2);
CHECK_EQ(5U, m->ToDexPC(pc));
CHECK_REGS(1);
}
} else if (m_name == "g") {
if (gJava_StackWalk_refmap_calls == 1) {
CHECK_EQ(0xcU, m->ToDexPC(pc));
CHECK_REGS(0, 2); // Note that v1 is not in the minimal root set
} else {
CHECK_EQ(gJava_StackWalk_refmap_calls, 2);
CHECK_EQ(0xcU, m->ToDexPC(pc));
CHECK_REGS(0, 2);
}
} else if (m_name == "shlemiel") {
if (gJava_StackWalk_refmap_calls == 1) {
CHECK_EQ(0x380U, m->ToDexPC(pc));
CHECK_REGS(2, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 21, 25);
} else {
CHECK_EQ(gJava_StackWalk_refmap_calls, 2);
CHECK_EQ(0x380U, m->ToDexPC(pc));
CHECK_REGS(2, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 21, 25);
}
}
LOG(INFO) << reinterpret_cast<const void*>(reg_bitmap);
return true;
}
};
extern "C" JNIEXPORT jint JNICALL Java_StackWalk_refmap(JNIEnv*, jobject, jint count) {
CHECK_EQ(count, 0);
gJava_StackWalk_refmap_calls++;
// Visitor
ReferenceMapVisitor mapper;
Thread::Current()->WalkStack(&mapper);
return count + 1;
}
extern "C" JNIEXPORT jint JNICALL Java_StackWalk2_refmap2(JNIEnv*, jobject, jint count) {
gJava_StackWalk_refmap_calls++;
// Visitor
ReferenceMapVisitor mapper;
Thread::Current()->WalkStack(&mapper);
return count + 1;
}
}
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