| // 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/functions.h" |
| |
| #include "tools/gn/config_values_generator.h" |
| #include "tools/gn/err.h" |
| #include "tools/gn/parse_tree.h" |
| #include "tools/gn/scope.h" |
| #include "tools/gn/target_generator.h" |
| #include "tools/gn/value.h" |
| #include "tools/gn/variables.h" |
| |
| #define DEPENDENT_CONFIG_VARS \ |
| " Dependent configs: all_dependent_configs, direct_dependent_configs\n" |
| #define DEPS_VARS \ |
| " Deps: data, datadeps, deps, forward_dependent_configs_from, hard_dep\n" |
| #define GENERAL_TARGET_VARS \ |
| " General: configs, external, source_prereqs, sources\n" |
| |
| namespace functions { |
| |
| namespace { |
| |
| Value ExecuteGenericTarget(const char* target_type, |
| Scope* scope, |
| const FunctionCallNode* function, |
| const std::vector<Value>& args, |
| BlockNode* block, |
| Err* err) { |
| if (!EnsureNotProcessingImport(function, scope, err) || |
| !EnsureNotProcessingBuildConfig(function, scope, err)) |
| return Value(); |
| Scope block_scope(scope); |
| if (!FillTargetBlockScope(scope, function, target_type, block, |
| args, &block_scope, err)) |
| return Value(); |
| |
| block->ExecuteBlockInScope(&block_scope, err); |
| if (err->has_error()) |
| return Value(); |
| |
| TargetGenerator::GenerateTarget(&block_scope, function, args, |
| target_type, err); |
| if (err->has_error()) |
| return Value(); |
| |
| block_scope.CheckForUnusedVars(err); |
| return Value(); |
| } |
| |
| } // namespace |
| |
| // component ------------------------------------------------------------------- |
| |
| const char kComponent[] = "component"; |
| const char kComponent_Help[] = |
| "component: Declare a component target.\n" |
| "\n" |
| " A component is a shared library, static library, or source set\n" |
| " depending on the component mode. This allows a project to separate\n" |
| " out a build into shared libraries for faster devlopment (link time is\n" |
| " reduced) but to switch to a static build for releases (for better\n" |
| " performance).\n" |
| "\n" |
| " To use this function you must set the value of the \"component_mode\n" |
| " variable to one of the following strings:\n" |
| " - \"shared_library\"\n" |
| " - \"static_library\"\n" |
| " - \"source_set\"\n" |
| " It is an error to call \"component\" without defining the mode\n" |
| " (typically this is done in the master build configuration file).\n"; |
| |
| Value RunComponent(Scope* scope, |
| const FunctionCallNode* function, |
| const std::vector<Value>& args, |
| BlockNode* block, |
| Err* err) { |
| // A component is either a shared or static library, depending on the value |
| // of |component_mode|. |
| const Value* component_mode_value = |
| scope->GetValue(variables::kComponentMode); |
| |
| static const char helptext[] = |
| "You're declaring a component here but have not defined " |
| "\"component_mode\" to\neither \"shared_library\" or \"static_library\"."; |
| if (!component_mode_value) { |
| *err = Err(function->function(), "No component mode set.", helptext); |
| return Value(); |
| } |
| if (component_mode_value->type() != Value::STRING || |
| (component_mode_value->string_value() != functions::kSharedLibrary && |
| component_mode_value->string_value() != functions::kStaticLibrary && |
| component_mode_value->string_value() != functions::kSourceSet)) { |
| *err = Err(function->function(), "Invalid component mode set.", helptext); |
| return Value(); |
| } |
| const std::string& component_mode = component_mode_value->string_value(); |
| |
| if (!EnsureNotProcessingImport(function, scope, err)) |
| return Value(); |
| Scope block_scope(scope); |
| if (!FillTargetBlockScope(scope, function, component_mode.c_str(), block, |
| args, &block_scope, err)) |
| return Value(); |
| |
| block->ExecuteBlockInScope(&block_scope, err); |
| if (err->has_error()) |
| return Value(); |
| |
| TargetGenerator::GenerateTarget(&block_scope, function, args, |
| component_mode, err); |
| return Value(); |
| } |
| |
| // copy ------------------------------------------------------------------------ |
| |
| const char kCopy[] = "copy"; |
| const char kCopy_Help[] = |
| "copy: Declare a target that copies files.\n" |
| "\n" |
| "File name handling\n" |
| "\n" |
| " All output files must be inside the output directory of the build.\n" |
| " You would generally use |$target_out_dir| or |$target_gen_dir| to\n" |
| " reference the output or generated intermediate file directories,\n" |
| " respectively.\n" |
| "\n" |
| " Both \"sources\" and \"outputs\" must be specified. Sources can\n" |
| " as many files as you want, but there can only be one item in the\n" |
| " outputs list (plural is used for the name for consistency with\n" |
| " other target types).\n" |
| "\n" |
| " If there is more than one source file, your output name should specify\n" |
| " a mapping from each source files to output file names using source\n" |
| " expansion (see \"gn help source_expansion\"). The placeholders will\n" |
| " will look like \"{{source_name_part}}\", for example.\n" |
| "\n" |
| "Examples\n" |
| "\n" |
| " # Write a rule that copies a checked-in DLL to the output directory.\n" |
| " copy(\"mydll\") {\n" |
| " sources = [ \"mydll.dll\" ]\n" |
| " outputs = [ \"$target_out_dir/mydll.dll\" ]\n" |
| " }\n" |
| "\n" |
| " # Write a rule to copy several files to the target generated files\n" |
| " # directory.\n" |
| " copy(\"myfiles\") {\n" |
| " sources = [ \"data1.dat\", \"data2.dat\", \"data3.dat\" ]\n" |
| "\n" |
| " # Use source expansion to generate output files with the\n" |
| " # corresponding file names in the gen dir. This will just copy each\n" |
| " # file.\n" |
| " outputs = [ \"$target_gen_dir/{{source_file_part}}\" ]\n" |
| " }\n"; |
| |
| Value RunCopy(const FunctionCallNode* function, |
| const std::vector<Value>& args, |
| Scope* scope, |
| Err* err) { |
| if (!EnsureNotProcessingImport(function, scope, err) || |
| !EnsureNotProcessingBuildConfig(function, scope, err)) |
| return Value(); |
| TargetGenerator::GenerateTarget(scope, function, args, functions::kCopy, err); |
| return Value(); |
| } |
| |
| // custom ---------------------------------------------------------------------- |
| |
| const char kCustom[] = "custom"; |
| const char kCustom_Help[] = |
| "custom: Declare a script-generated target.\n" |
| "\n" |
| " This target type allows you to run a script over a set of source\n" |
| " files and generate a set of output files.\n" |
| "\n" |
| " The script will be executed with the given arguments with the current\n" |
| " directory being that of the root build directory. If you pass files\n" |
| " to your script, see \"gn help to_build_path\" for how to convert\n" |
| " file names to be relative to the build directory (file names in the\n" |
| " sources, outputs, and source_prereqs will be all treated as relative\n" |
| " to the current build file and converted as needed automatically).\n" |
| "\n" |
| " There are two modes. The first mode is the \"per-file\" mode where you\n" |
| " specify a list of sources and the script is run once for each one as a\n" |
| " build rule. In this case, each file specified in the |outputs|\n" |
| " variable must be unique when applied to each source file (normally you\n" |
| " would reference |{{source_name_part}}| from within each one) or the\n" |
| " build system will get confused about how to build those files. You\n" |
| " should use the |source_prereqs| variable to list all additional\n" |
| " dependencies of your script: these will be added as dependencies for\n" |
| " each build step.\n" |
| "\n" |
| " The second mode is when you just want to run a script once rather than\n" |
| " as a general rule over a set of files. In this case you don't list any\n" |
| " sources. Dependencies of your script are specified only in the\n" |
| " |source_prereqs| variable and your |outputs| variable should just list\n" |
| " all outputs.\n" |
| "\n" |
| "File name handling\n" |
| "\n" |
| " All output files must be inside the output directory of the build.\n" |
| " You would generally use |$target_out_dir| or |$target_gen_dir| to\n" |
| " reference the output or generated intermediate file directories,\n" |
| " respectively.\n" |
| "\n" |
| " You can specify a mapping from source files to output files using\n" |
| " source expansion (see \"gn help source_expansion\"). The placeholders\n" |
| " will look like \"{{source}}\", for example, and can appear in\n" |
| " either the outputs or the args lists.\n" |
| "\n" |
| "Variables\n" |
| "\n" |
| " args, deps, outputs, script*, source_prereqs, sources\n" |
| " * = required\n" |
| "\n" |
| "Examples\n" |
| "\n" |
| " # Runs the script over each IDL file. The IDL script will generate\n" |
| " # both a .cc and a .h file for each input.\n" |
| " custom(\"general_rule\") {\n" |
| " script = \"idl_processor.py\"\n" |
| " sources = [ \"foo.idl\", \"bar.idl\" ]\n" |
| " source_prereqs = [ \"my_configuration.txt\" ]\n" |
| " outputs = [ \"$target_gen_dir/{{source_name_part}}.h\",\n" |
| " \"$target_gen_dir/{{source_name_part}}.cc\" ]\n" |
| "\n" |
| " # Note that since \"args\" is opaque to GN, if you specify paths\n" |
| " # here, you will need to convert it to be relative to the build\n" |
| " # directory using \"to_build_path()\".\n" |
| " args = [ \"{{source}}\",\n" |
| " \"-o\",\n" |
| " to_build_path(relative_target_gen_dir) + \"/\" +\n" |
| " {{source_name_part}}.h\" ]\n" |
| " }\n" |
| "\n" |
| " custom(\"just_run_this_guy_once\") {\n" |
| " script = \"doprocessing.py\"\n" |
| " source_prereqs = [ \"my_configuration.txt\" ]\n" |
| " outputs = [ \"$target_gen_dir/insightful_output.txt\" ]\n" |
| " args = [ \"--output_dir\", to_build_path(target_gen_dir) ]\n" |
| " }\n"; |
| |
| Value RunCustom(Scope* scope, |
| const FunctionCallNode* function, |
| const std::vector<Value>& args, |
| BlockNode* block, |
| Err* err) { |
| return ExecuteGenericTarget(functions::kCustom, scope, function, args, |
| block, err); |
| } |
| |
| // executable ------------------------------------------------------------------ |
| |
| const char kExecutable[] = "executable"; |
| const char kExecutable_Help[] = |
| "executable: Declare an executable target.\n" |
| "\n" |
| "Variables\n" |
| "\n" |
| CONFIG_VALUES_VARS_HELP |
| DEPS_VARS |
| DEPENDENT_CONFIG_VARS |
| GENERAL_TARGET_VARS; |
| |
| Value RunExecutable(Scope* scope, |
| const FunctionCallNode* function, |
| const std::vector<Value>& args, |
| BlockNode* block, |
| Err* err) { |
| return ExecuteGenericTarget(functions::kExecutable, scope, function, args, |
| block, err); |
| } |
| |
| // group ----------------------------------------------------------------------- |
| |
| const char kGroup[] = "group"; |
| const char kGroup_Help[] = |
| "group: Declare a named group of targets.\n" |
| "\n" |
| " This target type allows you to create meta-targets that just collect a\n" |
| " set of dependencies into one named target. Groups can additionally\n" |
| " specify configs that apply to their dependents.\n" |
| "\n" |
| " Depending on a group is exactly like depending directly on that\n" |
| " group's deps. Direct dependent configs will get automatically fowarded\n" |
| " through the group so you shouldn't need to use\n" |
| " \"forward_dependent_configs_from.\n" |
| "\n" |
| "Variables\n" |
| "\n" |
| DEPS_VARS |
| DEPENDENT_CONFIG_VARS |
| " Other variables: external\n" |
| "\n" |
| "Example\n" |
| "\n" |
| " group(\"all\") {\n" |
| " deps = [\n" |
| " \"//project:runner\",\n" |
| " \"//project:unit_tests\",\n" |
| " ]\n" |
| " }\n"; |
| |
| Value RunGroup(Scope* scope, |
| const FunctionCallNode* function, |
| const std::vector<Value>& args, |
| BlockNode* block, |
| Err* err) { |
| return ExecuteGenericTarget(functions::kGroup, scope, function, args, |
| block, err); |
| } |
| |
| // shared_library -------------------------------------------------------------- |
| |
| const char kSharedLibrary[] = "shared_library"; |
| const char kSharedLibrary_Help[] = |
| "shared_library: Declare a shared library target.\n" |
| "\n" |
| " A shared library will be specified on the linker line for targets\n" |
| " listing the shared library in its \"deps\". If you don't want this\n" |
| " (say you dynamically load the library at runtime), then you should\n" |
| " depend on the shared library via \"datadeps\" instead.\n" |
| "\n" |
| "Variables\n" |
| "\n" |
| CONFIG_VALUES_VARS_HELP |
| DEPS_VARS |
| DEPENDENT_CONFIG_VARS |
| GENERAL_TARGET_VARS; |
| |
| Value RunSharedLibrary(Scope* scope, |
| const FunctionCallNode* function, |
| const std::vector<Value>& args, |
| BlockNode* block, |
| Err* err) { |
| return ExecuteGenericTarget(functions::kSharedLibrary, scope, function, args, |
| block, err); |
| } |
| |
| // source_set ------------------------------------------------------------------ |
| |
| extern const char kSourceSet[] = "source_set"; |
| extern const char kSourceSet_Help[] = |
| "source_set: Declare a source set target.\n" |
| "\n" |
| " A source set is a collection of sources that get compiled, but are not\n" |
| " linked to produce any kind of library. Instead, the resulting object\n" |
| " files are implicitly added to the linker line of all targets that\n" |
| " depend on the source set.\n" |
| "\n" |
| " In most cases, a source set will behave like a static library, except\n" |
| " no actual library file will be produced. This will make the build go\n" |
| " a little faster by skipping creation of a large static library, while\n" |
| " maintaining the organizational benefits of focused build targets.\n" |
| "\n" |
| " The main difference between a source set and a static library is\n" |
| " around handling of exported symbols. Most linkers assume declaring\n" |
| " a function exported means exported from the static library. The linker\n" |
| " can then do dead code elimination to delete code not reachable from\n" |
| " exported functions.\n" |
| "\n" |
| " A source set will not do this code elimination since there is no link\n" |
| " step. This allows you to link many sources sets into a shared library\n" |
| " and have the \"exported symbol\" notation indicate \"export from the\n" |
| " final shared library and not from the intermediate targets.\" There is\n" |
| " no way to express this concept when linking multiple static libraries\n" |
| " into a shared library.\n" |
| "\n" |
| "Variables\n" |
| "\n" |
| CONFIG_VALUES_VARS_HELP |
| DEPS_VARS |
| DEPENDENT_CONFIG_VARS |
| GENERAL_TARGET_VARS; |
| |
| Value RunSourceSet(Scope* scope, |
| const FunctionCallNode* function, |
| const std::vector<Value>& args, |
| BlockNode* block, |
| Err* err) { |
| return ExecuteGenericTarget(functions::kSourceSet, scope, function, args, |
| block, err); |
| } |
| |
| // static_library -------------------------------------------------------------- |
| |
| const char kStaticLibrary[] = "static_library"; |
| const char kStaticLibrary_Help[] = |
| "static_library: Declare a static library target.\n" |
| "\n" |
| " Make a \".a\" / \".lib\" file.\n" |
| "\n" |
| " If you only need the static library for intermediate results in the\n" |
| " build, you should consider a source_set instead since it will skip\n" |
| " the (potentially slow) step of creating the intermediate library file.\n" |
| "\n" |
| "Variables\n" |
| "\n" |
| CONFIG_VALUES_VARS_HELP |
| DEPS_VARS |
| DEPENDENT_CONFIG_VARS |
| GENERAL_TARGET_VARS; |
| |
| Value RunStaticLibrary(Scope* scope, |
| const FunctionCallNode* function, |
| const std::vector<Value>& args, |
| BlockNode* block, |
| Err* err) { |
| return ExecuteGenericTarget(functions::kStaticLibrary, scope, function, args, |
| block, err); |
| } |
| |
| // test ------------------------------------------------------------------------ |
| |
| const char kTest[] = "test"; |
| const char kTest_Help[] = |
| "test: Declares a test target.\n" |
| "\n" |
| " This is like an executable target, but is named differently to make\n" |
| " the purpose of the target more obvious. It's possible in the future\n" |
| " we can do some enhancements like \"list all of the tests in a given\n" |
| " directory\".\n" |
| "\n" |
| " See \"gn help executable\" for usage.\n"; |
| |
| Value RunTest(Scope* scope, |
| const FunctionCallNode* function, |
| const std::vector<Value>& args, |
| BlockNode* block, |
| Err* err) { |
| return ExecuteGenericTarget(functions::kExecutable, scope, function, args, |
| block, err); |
| } |
| |
| } // namespace functions |
