Merge pull request #9592 from github/alexdenisov/extend-lua-tracer-config

Swift: extend tracer config to handle -resource-dir and drop unsupported CLI args

Author: redsun82

swift/tools/tracing-config.lua

@@ -3,6 +3,53 @@ function RegisterExtractorPack(id)
     local relativeSwiftExtractor = extractorDirectory .. 'extractor'
     local swiftExtractor = AbsolutifyExtractorPath(id, relativeSwiftExtractor)
 
+    function indexOf(array, value)
+      for i, v in ipairs(array) do
+        if v == value then
+          return i
+        end
+      end
+      return nil
+    end
+
+    -- removes upsupported CLI arg including the following how_many args
+    function strip_unsupported_arg(args, arg, how_many)
+      local index = indexOf(args, arg)
+      if index then
+        table.remove(args, index)
+        while (how_many > 0)
+        do
+          table.remove(args, index)
+          how_many = how_many - 1
+        end
+      end
+    end
+
+    function strip_unsupported_args(args)
+      strip_unsupported_arg(args, '-emit-localized-strings', 0)
+      strip_unsupported_arg(args, '-emit-localized-strings-path', 1)
+      strip_unsupported_arg(args, '-stack-check', 0)
+    end
+
+    -- xcodebuild does not always specify the -resource-dir in which case the compiler falls back
+    -- to a resource-dir based on its path
+    -- here we mimic this behavior externally
+    -- without a proper -resource-dir compiler-specific headers cannot be found which leads to
+    -- broken extraction
+    function insert_resource_dir_if_needed(compilerPath, args)
+      local resource_dir_index = indexOf(args, '-resource-dir')
+      if resource_dir_index then
+        return
+      end
+      -- derive -resource-dir based on the compilerPath
+      -- e.g.: /usr/bin/swift-frontend -> /usr/bin/../lib/swift
+      local last_slash_index = string.find(compilerPath, "/[^/]*$")
+      local compiler_dir = string.sub(compilerPath, 1, last_slash_index)
+      local resource_dir = compiler_dir .. '../lib/swift'
+      table.insert(args, '-resource-dir')
+      table.insert(args, resource_dir)
+    end
+
     function SwiftMatcher(compilerName, compilerPath, compilerArguments, lang)
         -- Only match binaries names `swift-frontend`
         if compilerName ~= 'swift-frontend' then return nil end
@@ -14,15 +61,18 @@ function RegisterExtractorPack(id)
 
         -- Skip "info" queries in case there is nothing to extract
         if compilerArguments.argv[1] == '-print-target-info' then
-            return nil
+          return nil
         end
         if compilerArguments.argv[1] == '-emit-supported-features' then
-            return nil
+          return nil
         end
 
         -- Skip actions in which we cannot extract anything
         if compilerArguments.argv[1] == '-merge-modules' then return nil end
 
+        strip_unsupported_args(compilerArguments.argv)
+        insert_resource_dir_if_needed(compilerPath, compilerArguments.argv)
+
         return {
             trace = true,
             replace = false,