| // Copyright 2020 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 "gn/rust_project_writer.h" |
| |
| #include <fstream> |
| #include <optional> |
| #include <sstream> |
| #include <tuple> |
| |
| #include "base/json/string_escape.h" |
| #include "gn/builder.h" |
| #include "gn/deps_iterator.h" |
| #include "gn/filesystem_utils.h" |
| #include "gn/ninja_target_command_util.h" |
| #include "gn/rust_project_writer_helpers.h" |
| #include "gn/rust_tool.h" |
| #include "gn/source_file.h" |
| #include "gn/string_output_buffer.h" |
| #include "gn/tool.h" |
| |
| #if defined(OS_WINDOWS) |
| #define NEWLINE "\r\n" |
| #else |
| #define NEWLINE "\n" |
| #endif |
| |
| // Current structure of rust-project.json output file |
| // |
| // { |
| // "roots": [ |
| // "some/source/root" // each crate's source root |
| // ], |
| // "crates": [ |
| // { |
| // "deps": [ |
| // { |
| // "crate": 1, // index into crate array |
| // "name": "alloc" // extern name of dependency |
| // }, |
| // ], |
| // "edition": "2018", // edition of crate |
| // "cfg": [ |
| // "unix", // "atomic" value config options |
| // "rust_panic=\"abort\""", // key="value" config options |
| // ] |
| // "root_module": "absolute path to crate", |
| // "label": "//path/target:value", // GN target for the crate |
| // "target": "x86_64-unknown-linux" // optional rustc target |
| // }, |
| // } |
| // |
| |
| bool RustProjectWriter::RunAndWriteFiles(const BuildSettings* build_settings, |
| const Builder& builder, |
| const std::string& file_name, |
| bool quiet, |
| Err* err) { |
| SourceFile output_file = build_settings->build_dir().ResolveRelativeFile( |
| Value(nullptr, file_name), err); |
| if (output_file.is_null()) |
| return false; |
| |
| base::FilePath output_path = build_settings->GetFullPath(output_file); |
| |
| std::vector<const Target*> all_targets = builder.GetAllResolvedTargets(); |
| |
| StringOutputBuffer out_buffer; |
| std::ostream out(&out_buffer); |
| |
| RenderJSON(build_settings, all_targets, out); |
| |
| if (out_buffer.ContentsEqual(output_path)) { |
| return true; |
| } |
| |
| return out_buffer.WriteToFile(output_path, err); |
| } |
| |
| // Map of Targets to their index in the crates list (for linking dependencies to |
| // their indexes). |
| using TargetIndexMap = std::unordered_map<const Target*, uint32_t>; |
| |
| // A collection of Targets. |
| using TargetsVector = UniqueVector<const Target*>; |
| |
| // Get the Rust deps for a target, recursively expanding OutputType::GROUPS |
| // that are present in the GN structure. This will return a flattened list of |
| // deps from the groups, but will not expand a Rust lib dependency to find any |
| // transitive Rust dependencies. |
| void GetRustDeps(const Target* target, TargetsVector* rust_deps) { |
| for (const auto& pair : target->GetDeps(Target::DEPS_LINKED)) { |
| const Target* dep = pair.ptr; |
| |
| if (dep->source_types_used().RustSourceUsed()) { |
| // Include any Rust dep. |
| rust_deps->push_back(dep); |
| } else if (dep->output_type() == Target::OutputType::GROUP) { |
| // Inspect (recursively) any group to see if it contains Rust deps. |
| GetRustDeps(dep, rust_deps); |
| } |
| } |
| } |
| TargetsVector GetRustDeps(const Target* target) { |
| TargetsVector deps; |
| GetRustDeps(target, &deps); |
| return deps; |
| } |
| |
| std::vector<std::string> ExtractCompilerArgs(const Target* target) { |
| std::vector<std::string> args; |
| for (ConfigValuesIterator iter(target); !iter.done(); iter.Next()) { |
| auto rustflags = iter.cur().rustflags(); |
| for (auto flag_iter = rustflags.begin(); flag_iter != rustflags.end(); |
| flag_iter++) { |
| args.push_back(*flag_iter); |
| } |
| } |
| return args; |
| } |
| |
| std::optional<std::string> FindArgValue(const char* arg, |
| const std::vector<std::string>& args) { |
| for (auto current = args.begin(); current != args.end();) { |
| // capture the current value |
| auto previous = *current; |
| // and increment |
| current++; |
| |
| // if the previous argument matches `arg`, and after the above increment the |
| // end hasn't been reached, this current argument is the desired value. |
| if (previous == arg && current != args.end()) { |
| return std::make_optional(*current); |
| } |
| } |
| return std::nullopt; |
| } |
| |
| std::optional<std::string> FindArgValueAfterPrefix( |
| const std::string& prefix, |
| const std::vector<std::string>& args) { |
| for (auto arg : args) { |
| if (!arg.compare(0, prefix.size(), prefix)) { |
| auto value = arg.substr(prefix.size()); |
| return std::make_optional(value); |
| } |
| } |
| return std::nullopt; |
| } |
| |
| std::vector<std::string> FindAllArgValuesAfterPrefix( |
| const std::string& prefix, |
| const std::vector<std::string>& args) { |
| std::vector<std::string> values; |
| for (auto arg : args) { |
| if (!arg.compare(0, prefix.size(), prefix)) { |
| auto value = arg.substr(prefix.size()); |
| values.push_back(value); |
| } |
| } |
| return values; |
| } |
| |
| // TODO(bwb) Parse sysroot structure from toml files. This is fragile and |
| // might break if upstream changes the dependency structure. |
| const std::string_view sysroot_crates[] = {"std", |
| "core", |
| "alloc", |
| "panic_unwind", |
| "proc_macro", |
| "test", |
| "panic_abort", |
| "unwind"}; |
| |
| // Multiple sysroot crates have dependenices on each other. This provides a |
| // mechanism for specifying that in an extendible manner. |
| const std::unordered_map<std::string_view, std::vector<std::string_view>> |
| sysroot_deps_map = {{"alloc", {"core"}}, |
| {"std", {"alloc", "core", "panic_abort", "unwind"}}}; |
| |
| // Add each of the crates a sysroot has, including their dependencies. |
| void AddSysrootCrate(const BuildSettings* build_settings, |
| std::string_view crate, |
| std::string_view current_sysroot, |
| SysrootCrateIndexMap& sysroot_crate_lookup, |
| CrateList& crate_list) { |
| if (sysroot_crate_lookup.find(crate) != sysroot_crate_lookup.end()) { |
| // If this sysroot crate is already in the lookup, we don't add it again. |
| return; |
| } |
| |
| // Add any crates that this sysroot crate depends on. |
| auto deps_lookup = sysroot_deps_map.find(crate); |
| if (deps_lookup != sysroot_deps_map.end()) { |
| auto deps = (*deps_lookup).second; |
| for (auto dep : deps) { |
| AddSysrootCrate(build_settings, dep, current_sysroot, |
| sysroot_crate_lookup, crate_list); |
| } |
| } |
| |
| size_t crate_index = crate_list.size(); |
| sysroot_crate_lookup.insert(std::make_pair(crate, crate_index)); |
| |
| base::FilePath rebased_out_dir = |
| build_settings->GetFullPath(build_settings->build_dir()); |
| auto crate_path = |
| FilePathToUTF8(rebased_out_dir) + std::string(current_sysroot) + |
| "/lib/rustlib/src/rust/library/" + std::string(crate) + "/src/lib.rs"; |
| |
| Crate sysroot_crate = |
| Crate(SourceFile(crate_path), crate_index, std::string(crate), "2018"); |
| |
| sysroot_crate.AddConfigItem("debug_assertions"); |
| |
| if (deps_lookup != sysroot_deps_map.end()) { |
| auto deps = (*deps_lookup).second; |
| for (auto dep : deps) { |
| auto idx = sysroot_crate_lookup[dep]; |
| sysroot_crate.AddDependency(idx, std::string(dep)); |
| } |
| } |
| |
| crate_list.push_back(sysroot_crate); |
| } |
| |
| // Add the given sysroot to the project, if it hasn't already been added. |
| void AddSysroot(const BuildSettings* build_settings, |
| std::string_view sysroot, |
| SysrootIndexMap& sysroot_lookup, |
| CrateList& crate_list) { |
| // If this sysroot is already in the lookup, we don't add it again. |
| if (sysroot_lookup.find(sysroot) != sysroot_lookup.end()) { |
| return; |
| } |
| |
| // Otherwise, add all of its crates |
| for (auto crate : sysroot_crates) { |
| AddSysrootCrate(build_settings, crate, sysroot, sysroot_lookup[sysroot], |
| crate_list); |
| } |
| } |
| |
| void AddSysrootDependencyToCrate(Crate* crate, |
| const SysrootCrateIndexMap& sysroot, |
| std::string_view crate_name) { |
| if (const auto crate_idx = sysroot.find(crate_name); |
| crate_idx != sysroot.end()) { |
| crate->AddDependency(crate_idx->second, std::string(crate_name)); |
| } |
| } |
| |
| void AddTarget(const BuildSettings* build_settings, |
| const Target* target, |
| TargetIndexMap& lookup, |
| SysrootIndexMap& sysroot_lookup, |
| CrateList& crate_list) { |
| if (lookup.find(target) != lookup.end()) { |
| // If target is already in the lookup, we don't add it again. |
| return; |
| } |
| |
| auto compiler_args = ExtractCompilerArgs(target); |
| auto compiler_target = FindArgValue("--target", compiler_args); |
| |
| // Check what sysroot this target needs. Add it to the crate list if it |
| // hasn't already been added. |
| auto rust_tool = |
| target->toolchain()->GetToolForTargetFinalOutputAsRust(target); |
| auto current_sysroot = rust_tool->GetSysroot(); |
| if (current_sysroot != "" && sysroot_lookup.count(current_sysroot) == 0) { |
| AddSysroot(build_settings, current_sysroot, sysroot_lookup, crate_list); |
| } |
| |
| auto crate_deps = GetRustDeps(target); |
| |
| // Add all dependencies of this crate, before this crate. |
| for (const auto& dep : crate_deps) { |
| AddTarget(build_settings, dep, lookup, sysroot_lookup, crate_list); |
| } |
| |
| // The index of a crate is its position (0-based) in the list of crates. |
| size_t crate_id = crate_list.size(); |
| |
| // Add the target to the crate lookup. |
| lookup.insert(std::make_pair(target, crate_id)); |
| |
| SourceFile crate_root = target->rust_values().crate_root(); |
| std::string crate_label = target->label().GetUserVisibleName(false); |
| |
| auto edition = |
| FindArgValueAfterPrefix(std::string("--edition="), compiler_args); |
| if (!edition.has_value()) { |
| edition = FindArgValue("--edition", compiler_args); |
| } |
| |
| Crate crate = |
| Crate(crate_root, crate_id, crate_label, edition.value_or("2015")); |
| |
| crate.SetCompilerArgs(compiler_args); |
| if (compiler_target.has_value()) |
| crate.SetCompilerTarget(compiler_target.value()); |
| |
| ConfigList cfgs = |
| FindAllArgValuesAfterPrefix(std::string("--cfg="), compiler_args); |
| |
| crate.AddConfigItem("test"); |
| crate.AddConfigItem("debug_assertions"); |
| |
| for (auto& cfg : cfgs) { |
| crate.AddConfigItem(cfg); |
| } |
| |
| // Add the sysroot dependencies, if there is one. |
| if (current_sysroot != "") { |
| const auto& sysroot = sysroot_lookup[current_sysroot]; |
| AddSysrootDependencyToCrate(&crate, sysroot, "core"); |
| AddSysrootDependencyToCrate(&crate, sysroot, "alloc"); |
| AddSysrootDependencyToCrate(&crate, sysroot, "std"); |
| |
| // Proc macros have the proc_macro crate as a direct dependency |
| if (std::string_view(rust_tool->name()) == |
| std::string_view(RustTool::kRsToolMacro)) { |
| AddSysrootDependencyToCrate(&crate, sysroot, "proc_macro"); |
| } |
| } |
| |
| // Add the rest of the crate dependencies. |
| for (const auto& dep : crate_deps) { |
| auto idx = lookup[dep]; |
| crate.AddDependency(idx, dep->rust_values().crate_name()); |
| } |
| |
| crate_list.push_back(crate); |
| } |
| |
| void WriteCrates(const BuildSettings* build_settings, |
| CrateList& crate_list, |
| std::ostream& rust_project) { |
| // produce a de-duplicated set of source roots: |
| std::set<std::string> roots; |
| for (auto& crate : crate_list) { |
| roots.insert( |
| FilePathToUTF8(build_settings->GetFullPath(crate.root().GetDir()))); |
| } |
| |
| rust_project << "{" NEWLINE; |
| rust_project << " \"roots\": ["; |
| bool first_root = true; |
| for (auto& root : roots) { |
| if (!first_root) |
| rust_project << ","; |
| first_root = false; |
| |
| rust_project << NEWLINE " \"" << root << "\""; |
| } |
| rust_project << NEWLINE " ]," NEWLINE; |
| rust_project << " \"crates\": ["; |
| bool first_crate = true; |
| for (auto& crate : crate_list) { |
| if (!first_crate) |
| rust_project << ","; |
| first_crate = false; |
| |
| auto crate_module = |
| FilePathToUTF8(build_settings->GetFullPath(crate.root())); |
| |
| rust_project << NEWLINE << " {" NEWLINE |
| << " \"crate_id\": " << crate.index() << "," NEWLINE |
| << " \"root_module\": \"" << crate_module << "\"," NEWLINE |
| << " \"label\": \"" << crate.label() << "\"," NEWLINE; |
| |
| auto compiler_target = crate.CompilerTarget(); |
| if (compiler_target.has_value()) { |
| rust_project << " \"target\": \"" << compiler_target.value() |
| << "\"," NEWLINE; |
| } |
| |
| auto compiler_args = crate.CompilerArgs(); |
| if (!compiler_args.empty()) { |
| rust_project << " \"compiler_args\": ["; |
| bool first_arg = true; |
| for (auto& arg : crate.CompilerArgs()) { |
| if (!first_arg) |
| rust_project << ", "; |
| first_arg = false; |
| |
| std::string escaped_arg; |
| base::EscapeJSONString(arg, false, &escaped_arg); |
| |
| rust_project << "\"" << escaped_arg << "\""; |
| } |
| rust_project << "]," << NEWLINE; |
| } |
| |
| rust_project << " \"deps\": ["; |
| bool first_dep = true; |
| for (auto& dep : crate.dependencies()) { |
| if (!first_dep) |
| rust_project << ","; |
| first_dep = false; |
| |
| rust_project << NEWLINE << " {" NEWLINE |
| << " \"crate\": " << dep.first << "," NEWLINE |
| << " \"name\": \"" << dep.second << "\"" NEWLINE |
| << " }"; |
| } |
| rust_project << NEWLINE " ]," NEWLINE; // end dep list |
| |
| rust_project << " \"edition\": \"" << crate.edition() << "\"," NEWLINE; |
| |
| rust_project << " \"cfg\": ["; |
| bool first_cfg = true; |
| for (const auto& cfg : crate.configs()) { |
| if (!first_cfg) |
| rust_project << ","; |
| first_cfg = false; |
| |
| std::string escaped_config; |
| base::EscapeJSONString(cfg, false, &escaped_config); |
| |
| rust_project << NEWLINE; |
| rust_project << " \"" << escaped_config << "\""; |
| } |
| rust_project << NEWLINE; |
| rust_project << " ]" NEWLINE; // end cfgs |
| |
| rust_project << " }"; // end crate |
| } |
| rust_project << NEWLINE " ]" NEWLINE; // end crate list |
| rust_project << "}" NEWLINE; |
| } |
| |
| void RustProjectWriter::RenderJSON(const BuildSettings* build_settings, |
| std::vector<const Target*>& all_targets, |
| std::ostream& rust_project) { |
| TargetIndexMap lookup; |
| SysrootIndexMap sysroot_lookup; |
| CrateList crate_list; |
| |
| // All the crates defined in the project. |
| for (const auto* target : all_targets) { |
| if (!target->IsBinary() || !target->source_types_used().RustSourceUsed()) |
| continue; |
| |
| AddTarget(build_settings, target, lookup, sysroot_lookup, crate_list); |
| } |
| |
| WriteCrates(build_settings, crate_list, rust_project); |
| } |