125 lines
4.2 KiB
C++
125 lines
4.2 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "DisplayListLogBuffer.h"
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// BUFFER_SIZE size must be one more than a multiple of COMMAND_SIZE to ensure
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// that mStart always points at the next command, not just the next item
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#define COMMAND_SIZE 2
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#define NUM_COMMANDS 50
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#define BUFFER_SIZE ((NUM_COMMANDS * COMMAND_SIZE) + 1)
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/**
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* DisplayListLogBuffer is a utility class which logs the most recent display
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* list operations in a circular buffer. The log is process-wide, because we
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* only care about the most recent operations, not the operations on a per-window
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* basis for a given activity. The purpose of the log is to provide more debugging
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* information in a bug report, by telling us not just where a process hung (which
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* generally is just reported as a stack trace at the Java level) or crashed, but
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* also what happened immediately before that hang or crash. This may help track down
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* problems in the native rendering code or driver interaction related to the display
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* list operations that led up to the hang or crash.
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*
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* The log is implemented as a circular buffer for both space and performance
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* reasons - we only care about the last several operations to give us context
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* leading up to the problem, and we don't want to constantly copy data around or do
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* additional mallocs to keep the most recent operations logged. Only numbers are
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* logged to make the operation fast. If and when the log is output, we process this
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* data into meaningful strings.
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*
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* There is an assumption about the format of the command (currently 2 ints: the
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* opcode and the nesting level). If the type of information logged changes (for example,
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* we may want to save a timestamp), then the size of the buffer and the way the
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* information is recorded in writeCommand() should change to suit.
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*/
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namespace android {
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#ifdef USE_OPENGL_RENDERER
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using namespace uirenderer;
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ANDROID_SINGLETON_STATIC_INSTANCE(DisplayListLogBuffer);
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#endif
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namespace uirenderer {
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DisplayListLogBuffer::DisplayListLogBuffer() {
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mBufferFirst = (int*) malloc(BUFFER_SIZE * sizeof(int));
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mStart = mBufferFirst;
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mBufferLast = mBufferFirst + BUFFER_SIZE - 1;
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mEnd = mStart;
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}
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DisplayListLogBuffer::~DisplayListLogBuffer() {
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free(mBufferFirst);
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}
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/**
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* Called from DisplayListRenderer to output the current buffer into the
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* specified FILE. This only happens in a dumpsys/bugreport operation.
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*/
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void DisplayListLogBuffer::outputCommands(FILE *file, const char* opNames[])
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{
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int *tmpBufferPtr = mStart;
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while (true) {
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if (tmpBufferPtr == mEnd) {
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break;
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}
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int level = *tmpBufferPtr++;
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if (tmpBufferPtr > mBufferLast) {
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tmpBufferPtr = mBufferFirst;
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}
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int op = *tmpBufferPtr++;
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if (tmpBufferPtr > mBufferLast) {
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tmpBufferPtr = mBufferFirst;
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}
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uint32_t count = (level + 1) * 2;
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char indent[count + 1];
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for (uint32_t i = 0; i < count; i++) {
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indent[i] = ' ';
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}
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indent[count] = '\0';
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fprintf(file, "%s%s\n", indent, opNames[op]);
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}
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}
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void DisplayListLogBuffer::writeCommand(int level, int op) {
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writeInt(level);
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writeInt(op);
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}
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/**
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* Store the given value in the buffer and increment/wrap the mEnd
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* and mStart values as appropriate.
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*/
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void DisplayListLogBuffer::writeInt(int value) {
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*((int*)mEnd) = value;
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if (mEnd == mBufferLast) {
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mEnd = mBufferFirst;
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} else {
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mEnd++;
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}
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if (mEnd == mStart) {
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mStart++;
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if (mStart > mBufferLast) {
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mStart = mBufferFirst;
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}
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}
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}
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}; // namespace uirenderer
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}; // namespace android
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