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// Copyright (c) 2013 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 "tools/gn/target.h"
#include "base/bind.h"
#include "tools/gn/config_values_extractors.h"
#include "tools/gn/scheduler.h"
namespace {
typedef std::set<const Config*> ConfigSet;
// Merges the dependent configs from the given target to the given config list.
// The unique_configs list is used for de-duping so values already added will
// not be added again.
void MergeDirectDependentConfigsFrom(const Target* from_target,
ConfigSet* unique_configs,
LabelConfigVector* dest) {
const LabelConfigVector& direct = from_target->direct_dependent_configs();
for (size_t i = 0; i < direct.size(); i++) {
if (unique_configs->find(direct[i].ptr) == unique_configs->end()) {
unique_configs->insert(direct[i].ptr);
dest->push_back(direct[i]);
}
}
}
// Like MergeDirectDependentConfigsFrom above except does the "all dependent"
// ones. This additionally adds all configs to the all_dependent_configs_ of
// the dest target given in *all_dest.
void MergeAllDependentConfigsFrom(const Target* from_target,
ConfigSet* unique_configs,
LabelConfigVector* dest,
LabelConfigVector* all_dest) {
const LabelConfigVector& all = from_target->all_dependent_configs();
for (size_t i = 0; i < all.size(); i++) {
// Always add it to all_dependent_configs_ since it might not be in that
// list even if we've seen it applied to this target before. This may
// introduce some duplicates in all_dependent_configs_, but those will
// we removed when they're actually applied to a target.
all_dest->push_back(all[i]);
if (unique_configs->find(all[i].ptr) == unique_configs->end()) {
// One we haven't seen yet, also apply it to ourselves.
dest->push_back(all[i]);
unique_configs->insert(all[i].ptr);
}
}
}
} // namespace
Target::Target(const Settings* settings, const Label& label)
: Item(settings, label),
output_type_(UNKNOWN),
hard_dep_(false),
external_(false) {
}
Target::~Target() {
}
// static
const char* Target::GetStringForOutputType(OutputType type) {
switch (type) {
case UNKNOWN:
return "Unknown";
case GROUP:
return "Group";
case EXECUTABLE:
return "Executable";
case SHARED_LIBRARY:
return "Shared library";
case STATIC_LIBRARY:
return "Static library";
case COPY_FILES:
return "Copy";
case CUSTOM:
return "Custom";
default:
return "";
}
}
Target* Target::AsTarget() {
return this;
}
const Target* Target::AsTarget() const {
return this;
}
void Target::OnResolved() {
DCHECK(output_type_ != UNKNOWN);
// Convert any groups we depend on to just direct dependencies on that
// group's deps. We insert the new deps immediately after the group so that
// the ordering is preserved. We need to keep the original group so that any
// flags, etc. that it specifies itself are applied to us.
size_t original_deps_size = deps_.size();
for (size_t i = 0; i < original_deps_size; i++) {
const Target* dep = deps_[i].ptr;
if (dep->output_type_ == GROUP) {
deps_.insert(deps_.begin() + i + 1, dep->deps_.begin(), dep->deps_.end());
i += dep->deps_.size();
}
}
// Only add each config once. First remember the target's configs.
ConfigSet unique_configs;
for (size_t i = 0; i < configs_.size(); i++)
unique_configs.insert(configs_[i].ptr);
// Copy our own dependent configs to the list of configs applying to us.
for (size_t i = 0; i < all_dependent_configs_.size(); i++) {
if (unique_configs.find(all_dependent_configs_[i].ptr) ==
unique_configs.end()) {
unique_configs.insert(all_dependent_configs_[i].ptr);
configs_.push_back(all_dependent_configs_[i]);
}
}
for (size_t i = 0; i < direct_dependent_configs_.size(); i++) {
if (unique_configs.find(direct_dependent_configs_[i].ptr) ==
unique_configs.end()) {
unique_configs.insert(direct_dependent_configs_[i].ptr);
configs_.push_back(direct_dependent_configs_[i]);
}
}
// Copy our own libs and lib_dirs to the final set. This will be from our
// target and all of our configs. We do this specially since these must be
// inherited through the dependency tree (other flags don't work this way).
for (ConfigValuesIterator iter(this); !iter.done(); iter.Next()) {
const ConfigValues& cur = iter.cur();
all_lib_dirs_.append(cur.lib_dirs().begin(), cur.lib_dirs().end());
all_libs_.append(cur.libs().begin(), cur.libs().end());
}
if (output_type_ != GROUP) {
// Don't pull target info like libraries and configs from dependencies into
// a group target. When A depends on a group G, the G's dependents will
// be treated as direct dependencies of A, so this is unnecessary and will
// actually result in duplicated settings (since settings will also be
// pulled from G to A in case G has configs directly on it).
PullDependentTargetInfo(&unique_configs);
}
}
bool Target::IsLinkable() const {
return output_type_ == STATIC_LIBRARY || output_type_ == SHARED_LIBRARY;
}
void Target::PullDependentTargetInfo(std::set<const Config*>* unique_configs) {
// Gather info from our dependents we need.
for (size_t dep_i = 0; dep_i < deps_.size(); dep_i++) {
const Target* dep = deps_[dep_i].ptr;
MergeAllDependentConfigsFrom(dep, unique_configs, &configs_,
&all_dependent_configs_);
MergeDirectDependentConfigsFrom(dep, unique_configs, &configs_);
// Direct dependent libraries.
if (dep->output_type() == STATIC_LIBRARY ||
dep->output_type() == SHARED_LIBRARY ||
dep->output_type() == SOURCE_SET)
inherited_libraries_.insert(dep);
// Inherited libraries and flags are inherited across static library
// boundaries.
if (dep->output_type() != SHARED_LIBRARY &&
dep->output_type() != EXECUTABLE) {
const std::set<const Target*> inherited = dep->inherited_libraries();
for (std::set<const Target*>::const_iterator i = inherited.begin();
i != inherited.end(); ++i)
inherited_libraries_.insert(*i);
// Inherited library settings.
all_lib_dirs_.append(dep->all_lib_dirs());
all_libs_.append(dep->all_libs());
}
}
// Forward direct dependent configs if requested.
for (size_t dep = 0; dep < forward_dependent_configs_.size(); dep++) {
const Target* from_target = forward_dependent_configs_[dep].ptr;
// The forward_dependent_configs_ must be in the deps already, so we
// don't need to bother copying to our configs, only forwarding.
DCHECK(std::find_if(deps_.begin(), deps_.end(),
LabelPtrPtrEquals<Target>(from_target)) !=
deps_.end());
direct_dependent_configs_.insert(
direct_dependent_configs_.end(),
from_target->direct_dependent_configs().begin(),
from_target->direct_dependent_configs().end());
}
}
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