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[Tooling] JSONCompilationDatabasePlugin infers compile commands for missing files 

Summary:
See the existing InterpolatingCompilationDatabase for details on how this works.
We've been using this in clangd for a while, the heuristics seem to work well.

Reviewers: bkramer

Subscribers: ilya-biryukov, ioeric, kadircet, cfe-commits

Differential Revision: https://reviews.llvm.org/D51729

llvm-svn: 342228
This commit is contained in:
Sam McCall 2018-09-14 12:24:09 +00:00
parent 2fcdf76eef
commit 9d3530bd4e
2 changed files with 11 additions and 4 deletions
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5
clang/lib/Tooling/JSONCompilationDatabase.cpp
View File

@ -157,13 +157,16 @@ std::vector<std::string> unescapeCommandLine(JSONCommandLineSyntax Syntax,
return parser.parse();
}
// This plugin locates a nearby compile_command.json file, and also infers
// compile commands for files not present in the database.
class JSONCompilationDatabasePlugin : public CompilationDatabasePlugin {
std::unique_ptr<CompilationDatabase>
loadFromDirectory(StringRef Directory, std::string &ErrorMessage) override {
SmallString<1024> JSONDatabasePath(Directory);
llvm::sys::path::append(JSONDatabasePath, "compile_commands.json");
return JSONCompilationDatabase::loadFromFile(
auto Base = JSONCompilationDatabase::loadFromFile(
JSONDatabasePath, ErrorMessage, JSONCommandLineSyntax::AutoDetect);
return Base ? inferMissingCompileCommands(std::move(Base)) : nullptr;
}
};

10
clang/test/Tooling/auto-detect-from-source.cpp
View File

@ -1,8 +1,12 @@
// RUN: rm -rf %t
// RUN: mkdir %t
// RUN: echo "[{\"directory\":\".\",\"command\":\"clang++ -c %/t/test.cpp\",\"file\":\"%/t/test.cpp\"}]" | sed -e 's/\\/\\\\/g' > %t/compile_commands.json
// RUN: echo "[{\"directory\":\".\",\"command\":\"clang++ -DSECRET=XYZZY -c %/t/test.cpp\",\"file\":\"%/t/test.cpp\"}]" | sed -e 's/\\/\\\\/g' > %t/compile_commands.json
// RUN: cp "%s" "%t/test.cpp"
// RUN: not clang-check "%t/test.cpp" 2>&1 | FileCheck %s
// CHECK: C++ requires
invalid;
// CHECK: XYZZY
SECRET;
// Copy to a different file, and rely on the command being inferred.
// RUN: cp "%s" "%t/other.cpp"
// RUN: not clang-check "%t/other.cpp" 2>&1 | FileCheck %s