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// Copyright 2012 Google Inc. All Rights Reserved.
//
// 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 "deps_log.h"
#include <assert.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "graph.h"
#include "state.h"
#include "util.h"
bool DepsLog::OpenForWrite(const string& path, string* err) {
file_ = fopen(path.c_str(), "ab");
if (!file_) {
*err = strerror(errno);
return false;
}
SetCloseOnExec(fileno(file_));
// Opening a file in append mode doesn't set the file pointer to the file's
// end on Windows. Do that explicitly.
fseek(file_, 0, SEEK_END);
/* XXX
if (ftell(log_file_) == 0) {
if (fprintf(log_file_, kFileSignature, kCurrentVersion) < 0) {
*err = strerror(errno);
return false;
}
}
*/
return true;
}
bool DepsLog::RecordDeps(Node* node, TimeStamp mtime,
const vector<Node*>& nodes) {
// Assign ids to all nodes that are missing one.
if (node->id() < 0)
RecordId(node);
for (vector<Node*>::const_iterator i = nodes.begin();
i != nodes.end(); ++i) {
if ((*i)->id() < 0)
RecordId(*i);
}
uint16_t size = 4 * (1 + 1 + nodes.size());
size |= 0x8000; // Deps record: set high bit.
fwrite(&size, 2, 1, file_);
int id = node->id();
fwrite(&id, 4, 1, file_);
int timestamp = node->mtime();
fwrite(×tamp, 4, 1, file_);
for (vector<Node*>::const_iterator i = nodes.begin();
i != nodes.end(); ++i) {
id = node->id();
fwrite(&id, 4, 1, file_);
}
return true;
}
void DepsLog::Close() {
fclose(file_);
file_ = NULL;
}
bool DepsLog::Load(const string& path, State* state, string* err) {
char buf[32 << 10];
FILE* f = fopen(path.c_str(), "rb");
if (!f) {
if (errno == ENOENT)
return true;
*err = strerror(errno);
return false;
}
int id = 0;
for (;;) {
uint16_t size;
if (fread(&size, 2, 1, f) < 1)
break;
bool is_deps = (size >> 15) != 0;
size = size & 0x7FFF;
if (fread(buf, size, 1, f) < 1)
break;
if (is_deps) {
assert(size % 4 == 0);
int* deps_data = reinterpret_cast<int*>(buf);
int out_id = deps_data[0];
int mtime = deps_data[1];
deps_data += 2;
int deps_count = (size / 4) - 2;
Deps* deps = new Deps;
deps->mtime = mtime;
deps->node_count = deps_count;
deps->nodes = new Node*[deps_count];
for (int i = 0; i < deps_count; ++i) {
assert(deps_data[i] < (int)nodes_.size());
assert(nodes_[deps_data[i]]);
deps->nodes[i] = nodes_[deps_data[i]];
}
if (out_id >= (int)deps_.size())
deps_.resize(out_id + 1);
if (deps_[out_id])
delete deps_[out_id];
deps_[out_id] = deps;
} else {
StringPiece path(buf, size);
Node* node = state->GetNode(path);
assert(node->id() < 0);
node->set_id(id);
++id;
}
}
if (ferror(f)) {
*err = strerror(ferror(f));
return false;
}
fclose(f);
return true;
}
DepsLog::Deps* DepsLog::GetDeps(Node* node) {
if (node->id() < 0)
return NULL;
return deps_[node->id()];
}
bool DepsLog::RecordId(Node* node) {
uint16_t size = node->path().size();
fwrite(&size, 2, 1, file_);
fwrite(node->path().data(), node->path().size(), 1, file_);
node->set_id(nodes_.size());
nodes_.push_back(node);
return true;
}
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