Stop using the runtime classpath in dex2oat

Use only --class-loader-context to infer the classpath that should be used
for compilation.

The tests and benchmarks no longer rely on --runtime-arg --classpath being
passed to dex2oat.

Bug: 36044779
Test: m test-art-host
Change-Id: Iba4cb3489f4a1a4a421071e1889d806d6c1d0738

1 files changed, 7 insertions, 3 deletions

diff --git a/runtime/class_loader_context.h b/runtime/class_loader_context.h
index 85299d41c0..9afa880da4 100644
--- a/runtime/class_loader_context.h
+++ b/runtime/class_loader_context.h
@@ -34,9 +34,6 @@ class OatFile;
 // Utility class which holds the class loader context used during compilation/verification.
 class ClassLoaderContext {
  public:
-  // Creates an empty context (with no class loaders).
-  ClassLoaderContext();
-
   ~ClassLoaderContext();
 
   // Opens requested class path files and appends them to ClassLoaderInfo::opened_dex_files.
@@ -126,6 +123,10 @@ class ClassLoaderContext {
   static std::unique_ptr<ClassLoaderContext> CreateContextForClassLoader(jobject class_loader,
                                                                          jobjectArray dex_elements);
 
+  // Returns the default class loader context to be used when none is specified.
+  // This will return a context with a single and empty PathClassLoader.
+  static std::unique_ptr<ClassLoaderContext> Default();
+
  private:
   enum ClassLoaderType {
     kInvalidClassLoader = 0,
@@ -151,6 +152,9 @@ class ClassLoaderContext {
     explicit ClassLoaderInfo(ClassLoaderType cl_type) : type(cl_type) {}
   };
 
+  // Creates an empty context (with no class loaders).
+  ClassLoaderContext();
+
   // Constructs an empty context.
   // `owns_the_dex_files` specifies whether or not the context will own the opened dex files
   // present in the class loader chain. If `owns_the_dex_files` is true then OpenDexFiles cannot