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Unified Diff: tools/gn/target_generator.cc

Issue 21114002: Add initial prototype for the GN meta-buildsystem. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: add owners and readme Created 7 years, 5 months ago
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Index: tools/gn/target_generator.cc
diff --git a/tools/gn/target_generator.cc b/tools/gn/target_generator.cc
new file mode 100644
index 0000000000000000000000000000000000000000..90c8fe65e33cb0b581b02595ed1aafb985b92370
--- /dev/null
+++ b/tools/gn/target_generator.cc
@@ -0,0 +1,334 @@
+// 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_generator.h"
+
+#include "base/files/file_path.h"
+#include "base/logging.h"
+#include "tools/gn/build_settings.h"
+#include "tools/gn/config.h"
+#include "tools/gn/config_values_generator.h"
+#include "tools/gn/err.h"
+#include "tools/gn/filesystem_utils.h"
+#include "tools/gn/functions.h"
+#include "tools/gn/input_file.h"
+#include "tools/gn/item_node.h"
+#include "tools/gn/ninja_target_writer.h"
+#include "tools/gn/parse_tree.h"
+#include "tools/gn/scheduler.h"
+#include "tools/gn/scope.h"
+#include "tools/gn/target_manager.h"
+#include "tools/gn/token.h"
+#include "tools/gn/value.h"
+#include "tools/gn/value_extractors.h"
+
+namespace {
+
+bool TypeHasConfigs(Target::OutputType type) {
+ return type == Target::EXECUTABLE ||
+ type == Target::SHARED_LIBRARY ||
+ type == Target::STATIC_LIBRARY ||
+ type == Target::LOADABLE_MODULE;
+}
+
+bool TypeHasConfigValues(Target::OutputType type) {
+ return type == Target::EXECUTABLE ||
+ type == Target::SHARED_LIBRARY ||
+ type == Target::STATIC_LIBRARY ||
+ type == Target::LOADABLE_MODULE;
+}
+
+bool TypeHasSources(Target::OutputType type) {
+ return type != Target::NONE;
+}
+
+bool TypeHasData(Target::OutputType type) {
+ return type != Target::NONE;
+}
+
+bool TypeHasDestDir(Target::OutputType type) {
+ return type == Target::COPY_FILES;
+}
+
+bool TypeHasOutputs(Target::OutputType type) {
+ return type == Target::CUSTOM;
+}
+
+} // namespace
+
+TargetGenerator::TargetGenerator(Target* target,
+ Scope* scope,
+ const Token& function_token,
+ const std::vector<Value>& args,
+ const std::string& output_type,
+ Err* err)
+ : target_(target),
+ scope_(scope),
+ function_token_(function_token),
+ args_(args),
+ output_type_(output_type),
+ err_(err),
+ input_directory_(function_token.location().file()->dir()) {
+}
+
+TargetGenerator::~TargetGenerator() {
+}
+
+void TargetGenerator::Run() {
+ // Output type.
+ Target::OutputType output_type = GetOutputType();
+ target_->set_output_type(output_type);
+ if (err_->has_error())
+ return;
+
+ if (TypeHasConfigs(output_type)) {
+ FillConfigs();
+ FillAllDependentConfigs();
+ FillDirectDependentConfigs();
+ }
+ if (TypeHasSources(output_type))
+ FillSources();
+ if (TypeHasData(output_type))
+ FillData();
+ if (output_type == Target::CUSTOM) {
+ FillScript();
+ FillScriptArgs();
+ }
+ if (TypeHasOutputs(output_type))
+ FillOutputs();
+ FillDependencies(); // All types have dependencies.
+
+ if (TypeHasConfigValues(output_type)) {
+ ConfigValuesGenerator gen(&target_->config_values(), scope_,
+ function_token_, input_directory_, err_);
+ gen.Run();
+ if (err_->has_error())
+ return;
+ }
+
+ if (TypeHasDestDir(output_type))
+ FillDestDir();
+
+ // Set the toolchain as a dependency of the target.
+ // TODO(brettw) currently we lock separately for each config, dep, and
+ // toolchain we add which is bad! Do this in one lock.
+ {
+ ItemTree* tree = &GetBuildSettings()->item_tree();
+ base::AutoLock lock(tree->lock());
+ ItemNode* tc_node =
+ tree->GetExistingNodeLocked(ToolchainLabelForScope(scope_));
+ tree->GetExistingNodeLocked(target_->label())->AddDependency(tc_node);
+ }
+
+ target_->SetGenerated(&function_token_);
+ GetBuildSettings()->target_manager().TargetGenerationComplete(
+ target_->label());
+}
+
+// static
+void TargetGenerator::GenerateTarget(Scope* scope,
+ const Token& function_token,
+ const std::vector<Value>& args,
+ const std::string& output_type,
+ Err* err) {
+ // Name is the argument to the function.
+ if (args.size() != 1u || args[0].type() != Value::STRING) {
+ *err = Err(function_token,
+ "Target generator requires one string argument.",
+ "Otherwise I'm not sure what to call this target.");
+ return;
+ }
+
+ // The location of the target is the directory name with no slash at the end.
+ // FIXME(brettw) validate name.
+ const Label& toolchain_label = ToolchainLabelForScope(scope);
+ Label label(function_token.location().file()->dir(),
+ args[0].string_value(),
+ toolchain_label.dir(), toolchain_label.name());
+
+ if (g_scheduler->verbose_logging())
+ g_scheduler->Log("Generating target", label.GetUserVisibleName(true));
+
+ Target* t = scope->settings()->build_settings()->target_manager().GetTarget(
+ label, function_token.range(), NULL, err);
+ if (err->has_error())
+ return;
+
+ TargetGenerator gen(t, scope, function_token, args, output_type, err);
+ gen.Run();
+}
+
+Target::OutputType TargetGenerator::GetOutputType() const {
+ if (output_type_ == functions::kGroup)
+ return Target::NONE;
+ if (output_type_ == functions::kExecutable)
+ return Target::EXECUTABLE;
+ if (output_type_ == functions::kSharedLibrary)
+ return Target::SHARED_LIBRARY;
+ if (output_type_ == functions::kStaticLibrary)
+ return Target::STATIC_LIBRARY;
+ // TODO(brettw) what does loadable module mean?
+ //if (output_type_ == ???)
+ // return Target::LOADABLE_MODULE;
+ if (output_type_ == functions::kCopy)
+ return Target::COPY_FILES;
+ if (output_type_ == functions::kCustom)
+ return Target::CUSTOM;
+
+ *err_ = Err(function_token_, "Not a known output type",
+ "I am very confused.");
+ return Target::NONE;
+}
+
+void TargetGenerator::FillGenericConfigs(
+ const char* var_name,
+ void (Target::*setter)(std::vector<const Config*>*)) {
+ const Value* value = scope_->GetValue(var_name, true);
+ if (!value)
+ return;
+
+ std::vector<Label> labels;
+ if (!ExtractListOfLabels(*value, input_directory_,
+ ToolchainLabelForScope(scope_), &labels, err_))
+ return;
+
+ std::vector<const Config*> dest_configs;
+ dest_configs.resize(labels.size());
+ for (size_t i = 0; i < labels.size(); i++) {
+ dest_configs[i] = Config::GetConfig(
+ scope_->settings(),
+ value->list_value()[i].origin()->GetRange(),
+ labels[i], target_, err_);
+ if (err_->has_error())
+ return;
+ }
+ (target_->*setter)(&dest_configs);
+}
+
+void TargetGenerator::FillConfigs() {
+ FillGenericConfigs("configs", &Target::swap_in_configs);
+}
+
+void TargetGenerator::FillAllDependentConfigs() {
+ FillGenericConfigs("all_dependent_configs",
+ &Target::swap_in_all_dependent_configs);
+}
+
+void TargetGenerator::FillDirectDependentConfigs() {
+ FillGenericConfigs("direct_dependent_configs",
+ &Target::swap_in_direct_dependent_configs);
+}
+
+void TargetGenerator::FillSources() {
+ const Value* value = scope_->GetValue("sources", true);
+ if (!value)
+ return;
+
+ Target::FileList dest_sources;
+ if (!ExtractListOfRelativeFiles(*value, input_directory_, &dest_sources,
+ err_))
+ return;
+ target_->swap_in_sources(&dest_sources);
+}
+
+void TargetGenerator::FillData() {
+ const Value* value = scope_->GetValue("data", true);
+ if (!value)
+ return;
+
+ Target::FileList dest_data;
+ if (!ExtractListOfRelativeFiles(*value, input_directory_, &dest_data,
+ err_))
+ return;
+ target_->swap_in_data(&dest_data);
+}
+
+void TargetGenerator::FillDependencies() {
+ const Value* value = scope_->GetValue("deps", true);
+ if (!value)
+ return;
+
+ std::vector<Label> labels;
+ if (!ExtractListOfLabels(*value, input_directory_,
+ ToolchainLabelForScope(scope_), &labels, err_))
+ return;
+
+ std::vector<const Target*> dest_deps;
+ dest_deps.resize(labels.size());
+ for (size_t i = 0; i < labels.size(); i++) {
+ dest_deps[i] = GetBuildSettings()->target_manager().GetTarget(
+ labels[i], value->list_value()[i].origin()->GetRange(), target_, err_);
+ if (err_->has_error())
+ return;
+ }
+
+ target_->swap_in_deps(&dest_deps);
+}
+
+void TargetGenerator::FillDestDir() {
+ // Destdir is required for all targets that use it.
+ const Value* value = scope_->GetValue("destdir", true);
+ if (!value) {
+ *err_ = Err(function_token_, "This target type requires a \"destdir\".");
+ return;
+ }
+ if (!value->VerifyTypeIs(Value::STRING, err_))
+ return;
+
+ if (!EnsureStringIsInOutputDir(
+ GetBuildSettings()->build_dir(),
+ value->string_value(), *value, err_))
+ return;
+ target_->set_destdir(SourceDir(value->string_value()));
+}
+
+void TargetGenerator::FillScript() {
+ // If this gets called, the target type requires a script, so error out
+ // if it doesn't have one.
+ const Value* value = scope_->GetValue("script", true);
+ if (!value) {
+ *err_ = Err(function_token_, "This target type requires a \"script\".");
+ return;
+ }
+ if (!value->VerifyTypeIs(Value::STRING, err_))
+ return;
+
+ target_->set_script(
+ input_directory_.ResolveRelativeFile(value->string_value()));
+}
+
+void TargetGenerator::FillScriptArgs() {
+ const Value* value = scope_->GetValue("args", true);
+ if (!value)
+ return;
+
+ std::vector<std::string> args;
+ if (!ExtractListOfStringValues(*value, &args, err_))
+ return;
+ target_->swap_in_script_args(&args);
+}
+
+void TargetGenerator::FillOutputs() {
+ const Value* value = scope_->GetValue("outputs", true);
+ if (!value)
+ return;
+
+ Target::FileList outputs;
+ if (!ExtractListOfRelativeFiles(*value, input_directory_, &outputs, err_))
+ return;
+
+ // Validate that outputs are in the output dir.
+ CHECK(outputs.size() == value->list_value().size());
+ for (size_t i = 0; i < outputs.size(); i++) {
+ if (!EnsureStringIsInOutputDir(
+ GetBuildSettings()->build_dir(),
+ outputs[i].value(), value->list_value()[i], err_))
+ return;
+ }
+ target_->swap_in_outputs(&outputs);
+}
+
+const BuildSettings* TargetGenerator::GetBuildSettings() const {
+ return scope_->settings()->build_settings();
+}
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