[clang] [Tooling] Fix FixedCompilationDatabase with header compile flags (PR #73913)

[Sam McCall via cfe-commits]

https://github.com/sam-mccall updated https://github.com/llvm/llvm-project/pull/73913

>From 98768562935cdf1c42e41d9bbe09cfdc0a545c2a Mon Sep 17 00:00:00 2001
From: Sam McCall <sam.mccall at gmail.com>
Date: Thu, 30 Nov 2023 10:22:00 +0100
Subject: [PATCH] [Tooling] Fix FixedCompilationDatabase with header compile
 flags

Summary:
The logic to strip positional args feels very fragile, but it's terribly useful
when you want to use a tool on a file and have the exact argv.

Today doesn't work with header-parsing actions because these are "precompile"
rather than "compile", from tooling's perspective it's all the same.

Reviewers:
kadircet

Subscribers:
---
 clang/lib/Tooling/CompilationDatabase.cpp     |  4 +++-
 .../Tooling/CompilationDatabaseTest.cpp       | 20 ++++++++++++++++++-
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/clang/lib/Tooling/CompilationDatabase.cpp b/clang/lib/Tooling/CompilationDatabase.cpp
index fdf6015508d94b..2b6e6a09f1335c 100644
--- a/clang/lib/Tooling/CompilationDatabase.cpp
+++ b/clang/lib/Tooling/CompilationDatabase.cpp
@@ -156,6 +156,7 @@ struct CompileJobAnalyzer {
     bool CollectChildren = Collect;
     switch (A->getKind()) {
     case driver::Action::CompileJobClass:
+    case driver::Action::PrecompileJobClass:
       CollectChildren = true;
       break;
 
@@ -293,7 +294,8 @@ static bool stripPositionalArgs(std::vector<const char *> Args,
     // -flto* flags make the BackendJobClass, which still needs analyzer.
     if (Cmd.getSource().getKind() == driver::Action::AssembleJobClass ||
         Cmd.getSource().getKind() == driver::Action::BackendJobClass ||
-        Cmd.getSource().getKind() == driver::Action::CompileJobClass) {
+        Cmd.getSource().getKind() == driver::Action::CompileJobClass ||
+        Cmd.getSource().getKind() == driver::Action::PrecompileJobClass) {
       CompileAnalyzer.run(&Cmd.getSource());
     }
   }
diff --git a/clang/unittests/Tooling/CompilationDatabaseTest.cpp b/clang/unittests/Tooling/CompilationDatabaseTest.cpp
index 5173d472486bfc..45062cf7c16f6f 100644
--- a/clang/unittests/Tooling/CompilationDatabaseTest.cpp
+++ b/clang/unittests/Tooling/CompilationDatabaseTest.cpp
@@ -647,12 +647,30 @@ TEST(ParseFixedCompilationDatabase, HandlesPositionalArgs) {
       FixedCompilationDatabase::loadFromCommandLine(Argc, Argv, ErrorMsg);
   ASSERT_TRUE((bool)Database);
   ASSERT_TRUE(ErrorMsg.empty());
+  std::vector<CompileCommand> Result = Database->getCompileCommands("source");
+  ASSERT_EQ(1ul, Result.size());
+  ASSERT_EQ(".", Result[0].Directory);
+  ASSERT_THAT(Result[0].CommandLine,
+              ElementsAre(EndsWith("clang-tool"), "-c", "-DDEF3", "source"));
+  EXPECT_EQ(2, Argc);
+}
+
+TEST(ParseFixedCompilationDatabase, HandlesPositionalArgsHeader) {
+  const char *Argv[] = {"1",  "2",          "--",    "-xc++-header",
+                        "-c", "somefile.h", "-DDEF3"};
+  int Argc = std::size(Argv);
+  std::string ErrorMsg;
+  std::unique_ptr<FixedCompilationDatabase> Database =
+      FixedCompilationDatabase::loadFromCommandLine(Argc, Argv, ErrorMsg);
+  ASSERT_TRUE((bool)Database);
+  ASSERT_TRUE(ErrorMsg.empty());
   std::vector<CompileCommand> Result =
     Database->getCompileCommands("source");
   ASSERT_EQ(1ul, Result.size());
   ASSERT_EQ(".", Result[0].Directory);
   ASSERT_THAT(Result[0].CommandLine,
-              ElementsAre(EndsWith("clang-tool"), "-c", "-DDEF3", "source"));
+              ElementsAre(EndsWith("clang-tool"), "-xc++-header", "-c",
+                          "-DDEF3", "source"));
   EXPECT_EQ(2, Argc);
 }