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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "gpu/command_buffer/service/common_decoder.h"
#include "gpu/command_buffer/service/cmd_buffer_engine.h"
namespace gpu {
CommonDecoder::Bucket::Bucket() : size_(0) {}
CommonDecoder::Bucket::~Bucket() {}
void* CommonDecoder::Bucket::GetData(size_t offset, size_t size) const {
if (OffsetSizeValid(offset, size)) {
return data_.get() + offset;
}
return NULL;
}
void CommonDecoder::Bucket::SetSize(size_t size) {
if (size != size_) {
data_.reset(size ? new int8[size] : NULL);
size_ = size;
memset(data_.get(), 0, size);
}
}
bool CommonDecoder::Bucket::SetData(
const void* src, size_t offset, size_t size) {
if (OffsetSizeValid(offset, size)) {
memcpy(data_.get() + offset, src, size);
return true;
}
return false;
}
void CommonDecoder::Bucket::SetFromString(const char* str) {
// Strings are passed NULL terminated to distinguish between empty string
// and no string.
if (!str) {
SetSize(0);
} else {
size_t size = strlen(str) + 1;
SetSize(size);
SetData(str, 0, size);
}
}
bool CommonDecoder::Bucket::GetAsString(std::string* str) {
DCHECK(str);
if (size_ == 0) {
return false;
}
str->assign(GetDataAs<const char*>(0, size_ - 1), size_ - 1);
return true;
}
CommonDecoder::CommonDecoder() : engine_(NULL) {}
CommonDecoder::~CommonDecoder() {}
void* CommonDecoder::GetAddressAndCheckSize(unsigned int shm_id,
unsigned int offset,
unsigned int size) {
Buffer buffer = engine_->GetSharedMemoryBuffer(shm_id);
if (!buffer.ptr)
return NULL;
unsigned int end = offset + size;
if (end > buffer.size || end < offset) {
return NULL;
}
return static_cast<int8*>(buffer.ptr) + offset;
}
bool CommonDecoder::PushAddress(uint32 offset) {
if (call_stack_.size() < kMaxStackDepth) {
CommandAddress return_address(engine_->GetGetOffset());
if (engine_->SetGetOffset(offset)) {
call_stack_.push(return_address);
return true;
}
}
return false;
}
const char* CommonDecoder::GetCommonCommandName(
cmd::CommandId command_id) const {
return cmd::GetCommandName(command_id);
}
CommonDecoder::Bucket* CommonDecoder::GetBucket(uint32 bucket_id) const {
BucketMap::const_iterator iter(buckets_.find(bucket_id));
return iter != buckets_.end() ? &(*iter->second) : NULL;
}
CommonDecoder::Bucket* CommonDecoder::CreateBucket(uint32 bucket_id) {
Bucket* bucket = GetBucket(bucket_id);
if (!bucket) {
bucket = new Bucket();
buckets_[bucket_id] = linked_ptr<Bucket>(bucket);
}
return bucket;
}
namespace {
// Returns the address of the first byte after a struct.
template <typename T>
const void* AddressAfterStruct(const T& pod) {
return reinterpret_cast<const uint8*>(&pod) + sizeof(pod);
}
// Returns the address of the frst byte after the struct.
template <typename RETURN_TYPE, typename COMMAND_TYPE>
RETURN_TYPE GetImmediateDataAs(const COMMAND_TYPE& pod) {
return static_cast<RETURN_TYPE>(const_cast<void*>(AddressAfterStruct(pod)));
}
// A struct to hold info about each command.
struct CommandInfo {
int arg_flags; // How to handle the arguments for this command
int arg_count; // How many arguments are expected for this command.
};
// A table of CommandInfo for all the commands.
const CommandInfo g_command_info[] = {
#define COMMON_COMMAND_BUFFER_CMD_OP(name) { \
cmd::name::kArgFlags, \
sizeof(cmd::name) / sizeof(CommandBufferEntry) - 1, }, /* NOLINT */ \
COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
#undef COMMON_COMMAND_BUFFER_CMD_OP
};
} // anonymous namespace.
// Decode command with its arguments, and call the corresponding method.
// Note: args is a pointer to the command buffer. As such, it could be changed
// by a (malicious) client at any time, so if validation has to happen, it
// should operate on a copy of them.
error::Error CommonDecoder::DoCommonCommand(
unsigned int command,
unsigned int arg_count,
const void* cmd_data) {
if (command < arraysize(g_command_info)) {
const CommandInfo& info = g_command_info[command];
unsigned int info_arg_count = static_cast<unsigned int>(info.arg_count);
if ((info.arg_flags == cmd::kFixed && arg_count == info_arg_count) ||
(info.arg_flags == cmd::kAtLeastN && arg_count >= info_arg_count)) {
uint32 immediate_data_size =
(arg_count - info_arg_count) * sizeof(CommandBufferEntry); // NOLINT
switch (command) {
#define COMMON_COMMAND_BUFFER_CMD_OP(name) \
case cmd::name::kCmdId: \
return Handle ## name( \
immediate_data_size, \
*static_cast<const cmd::name*>(cmd_data)); \
COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
#undef COMMON_COMMAND_BUFFER_CMD_OP
}
} else {
return error::kInvalidArguments;
}
}
return DoCommonCommand(command, arg_count, cmd_data);
return error::kUnknownCommand;
}
error::Error CommonDecoder::HandleNoop(
uint32 immediate_data_size,
const cmd::Noop& args) {
return error::kNoError;
}
error::Error CommonDecoder::HandleSetToken(
uint32 immediate_data_size,
const cmd::SetToken& args) {
engine_->set_token(args.token);
return error::kNoError;
}
error::Error CommonDecoder::HandleJump(
uint32 immediate_data_size,
const cmd::Jump& args) {
if (!engine_->SetGetOffset(args.offset)) {
return error::kInvalidArguments;
}
return error::kNoError;
}
error::Error CommonDecoder::HandleJumpRelative(
uint32 immediate_data_size,
const cmd::JumpRelative& args) {
if (!engine_->SetGetOffset(engine_->GetGetOffset() + args.offset)) {
return error::kInvalidArguments;
}
return error::kNoError;
}
error::Error CommonDecoder::HandleCall(
uint32 immediate_data_size,
const cmd::Call& args) {
if (!PushAddress(args.offset)) {
return error::kInvalidArguments;
}
return error::kNoError;
}
error::Error CommonDecoder::HandleCallRelative(
uint32 immediate_data_size,
const cmd::CallRelative& args) {
if (!PushAddress(engine_->GetGetOffset() + args.offset)) {
return error::kInvalidArguments;
}
return error::kNoError;
}
error::Error CommonDecoder::HandleReturn(
uint32 immediate_data_size,
const cmd::Return& args) {
if (call_stack_.empty()) {
return error::kInvalidArguments;
}
CommandAddress return_address = call_stack_.top();
call_stack_.pop();
if (!engine_->SetGetOffset(return_address.offset)) {
return error::kInvalidArguments;
}
return error::kNoError;
}
error::Error CommonDecoder::HandleSetBucketSize(
uint32 immediate_data_size,
const cmd::SetBucketSize& args) {
uint32 bucket_id = args.bucket_id;
uint32 size = args.size;
Bucket* bucket = CreateBucket(bucket_id);
bucket->SetSize(size);
return error::kNoError;
}
error::Error CommonDecoder::HandleSetBucketData(
uint32 immediate_data_size,
const cmd::SetBucketData& args) {
uint32 bucket_id = args.bucket_id;
uint32 offset = args.offset;
uint32 size = args.size;
const void* data = GetSharedMemoryAs<const void*>(
args.shared_memory_id, args.shared_memory_offset, size);
if (!data) {
return error::kInvalidArguments;
}
Bucket* bucket = GetBucket(bucket_id);
if (!bucket) {
return error::kInvalidArguments;
}
if (!bucket->SetData(data, offset, size)) {
return error::kInvalidArguments;
}
return error::kNoError;
}
error::Error CommonDecoder::HandleSetBucketDataImmediate(
uint32 immediate_data_size,
const cmd::SetBucketDataImmediate& args) {
const void* data = GetImmediateDataAs<const void*>(args);
uint32 bucket_id = args.bucket_id;
uint32 offset = args.offset;
uint32 size = args.size;
if (size > immediate_data_size) {
return error::kInvalidArguments;
}
Bucket* bucket = GetBucket(bucket_id);
if (!bucket) {
return error::kInvalidArguments;
}
if (!bucket->SetData(data, offset, size)) {
return error::kInvalidArguments;
}
return error::kNoError;
}
error::Error CommonDecoder::HandleGetBucketStart(
uint32 immediate_data_size,
const cmd::GetBucketStart& args) {
uint32 bucket_id = args.bucket_id;
uint32* result = GetSharedMemoryAs<uint32*>(
args.result_memory_id, args.result_memory_offset, sizeof(*result));
int32 data_memory_id = args.data_memory_id;
uint32 data_memory_offset = args.data_memory_offset;
uint32 data_memory_size = args.data_memory_size;
uint8* data = NULL;
if (data_memory_size != 0 || data_memory_id != 0 || data_memory_offset != 0) {
data = GetSharedMemoryAs<uint8*>(
args.data_memory_id, args.data_memory_offset, args.data_memory_size);
if (!data) {
return error::kInvalidArguments;
}
}
if (!result) {
return error::kInvalidArguments;
}
// Check that the client initialized the result.
if (*result != 0) {
return error::kInvalidArguments;
}
Bucket* bucket = GetBucket(bucket_id);
if (!bucket) {
return error::kInvalidArguments;
}
uint32 bucket_size = bucket->size();
*result = bucket_size;
if (data) {
uint32 size = std::min(data_memory_size, bucket_size);
memcpy(data, bucket->GetData(0, size), size);
}
return error::kNoError;
}
error::Error CommonDecoder::HandleGetBucketData(
uint32 immediate_data_size,
const cmd::GetBucketData& args) {
uint32 bucket_id = args.bucket_id;
uint32 offset = args.offset;
uint32 size = args.size;
void* data = GetSharedMemoryAs<void*>(
args.shared_memory_id, args.shared_memory_offset, size);
if (!data) {
return error::kInvalidArguments;
}
Bucket* bucket = GetBucket(bucket_id);
if (!bucket) {
return error::kInvalidArguments;
}
const void* src = bucket->GetData(offset, size);
if (!src) {
return error::kInvalidArguments;
}
memcpy(data, src, size);
return error::kNoError;
}
} // namespace gpu
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