1 // Copyright 2018 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "gn/ninja_generated_file_target_writer.h"
6
7 #include "base/strings/string_util.h"
8 #include "gn/deps_iterator.h"
9 #include "gn/output_conversion.h"
10 #include "gn/output_file.h"
11 #include "gn/scheduler.h"
12 #include "gn/settings.h"
13 #include "gn/string_output_buffer.h"
14 #include "gn/string_utils.h"
15 #include "gn/target.h"
16 #include "gn/trace.h"
17
NinjaGeneratedFileTargetWriter(const Target * target,std::ostream & out)18 NinjaGeneratedFileTargetWriter::NinjaGeneratedFileTargetWriter(
19 const Target* target,
20 std::ostream& out)
21 : NinjaTargetWriter(target, out) {}
22
23 NinjaGeneratedFileTargetWriter::~NinjaGeneratedFileTargetWriter() = default;
24
Run()25 void NinjaGeneratedFileTargetWriter::Run() {
26 // Write the file.
27 GenerateFile();
28
29 // A generated_file target should generate a stamp file with dependencies
30 // on each of the deps and data_deps in the target. The actual collection is
31 // done at gen time, and so ninja doesn't need to know about it.
32 std::vector<OutputFile> output_files;
33 std::vector<OutputFile> data_output_files;
34 const auto& target_deps = resolved().GetTargetDeps(target_);
35 for (const Target* dep : target_deps.linked_deps()) {
36 if (dep->IsDataOnly()) {
37 data_output_files.push_back(dep->dependency_output_file());
38 } else {
39 output_files.push_back(dep->dependency_output_file());
40 }
41 }
42
43 for (const Target* data_dep : target_deps.data_deps())
44 data_output_files.push_back(data_dep->dependency_output_file());
45
46 WriteStampForTarget(output_files, data_output_files);
47 }
48
GenerateFile()49 void NinjaGeneratedFileTargetWriter::GenerateFile() {
50 Err err;
51
52 std::vector<SourceFile> outputs_as_sources;
53 target_->action_values().GetOutputsAsSourceFiles(target_,
54 &outputs_as_sources);
55 CHECK(outputs_as_sources.size() == 1);
56
57 base::FilePath output =
58 settings_->build_settings()->GetFullPath(outputs_as_sources[0]);
59 ScopedTrace trace(TraceItem::TRACE_FILE_WRITE_GENERATED,
60 outputs_as_sources[0].value());
61 trace.SetToolchain(target_->settings()->toolchain_label());
62
63 // If this is a metadata target, populate the write value with the appropriate
64 // data.
65 Value contents;
66 if (target_->contents().type() == Value::NONE) {
67 // Origin is set to the outputs location, so that errors with this value
68 // get flagged on the right target.
69 CHECK(target_->action_values().outputs().list().size() == 1U);
70 contents = Value(target_->action_values().outputs().list()[0].origin(),
71 Value::LIST);
72 TargetSet targets_walked;
73 ScopedTrace metadata_walk_trace(TraceItem::TRACE_WALK_METADATA,
74 target_->label());
75 trace.SetToolchain(target_->settings()->toolchain_label());
76 if (!target_->GetMetadata(target_->data_keys(), target_->walk_keys(),
77 target_->rebase(), /*deps_only = */ true,
78 &contents.list_value(), &targets_walked, &err)) {
79 g_scheduler->FailWithError(err);
80 return;
81 }
82 } else {
83 contents = target_->contents();
84 }
85
86 // Compute output.
87 StringOutputBuffer storage;
88 std::ostream out(&storage);
89 ConvertValueToOutput(settings_, contents, target_->output_conversion(), out,
90 &err);
91
92 if (err.has_error()) {
93 g_scheduler->FailWithError(err);
94 return;
95 }
96
97 storage.WriteToFileIfChanged(output, &err);
98
99 if (err.has_error()) {
100 g_scheduler->FailWithError(err);
101 return;
102 }
103 }
104