Add new style String operations during compilation init

This allows some class initializers that deal with Strings to run during
compilation. This includes the current implementation of
java.security.Security because it reads the "java.security" resource.

(cherry picked from commit a298e6daf8a11a780f061f2177ac3e75b8dd5e55)

Bug: 21036900
Change-Id: I2ea008b774d4ed359e155318e0d06c1566186c34

1 files changed, 66 insertions, 0 deletions

diff --git a/runtime/interpreter/unstarted_runtime.cc b/runtime/interpreter/unstarted_runtime.cc
index f30c93a5af..9006257d00 100644
--- a/runtime/interpreter/unstarted_runtime.cc
+++ b/runtime/interpreter/unstarted_runtime.cc
@@ -755,6 +755,64 @@ static void UnstartedSecurityGetSecurityPropertiesReader(
   result->SetL(h_obj.Get());
 }
 
+// This allows reading the new style of String objects during compilation.
+static void UnstartedStringGetCharsNoCheck(
+    Thread* self, ShadowFrame* shadow_frame, JValue* result ATTRIBUTE_UNUSED, size_t arg_offset)
+    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+  jint start = shadow_frame->GetVReg(arg_offset + 1);
+  jint end = shadow_frame->GetVReg(arg_offset + 2);
+  jint index = shadow_frame->GetVReg(arg_offset + 4);
+  mirror::String* string = shadow_frame->GetVRegReference(arg_offset)->AsString();
+  if (string == nullptr) {
+    AbortTransactionOrFail(self, "String.getCharsNoCheck with null object");
+    return;
+  }
+  StackHandleScope<1> hs(self);
+  Handle<mirror::CharArray> h_char_array(hs.NewHandle(shadow_frame->GetVRegReference(arg_offset + 3)->AsCharArray()));
+  string->GetChars(start, end, h_char_array, index);
+}
+
+// This allows reading chars from the new style of String objects during compilation.
+static void UnstartedStringCharAt(
+    Thread* self, ShadowFrame* shadow_frame, JValue* result, size_t arg_offset)
+    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+  jint index = shadow_frame->GetVReg(arg_offset + 1);
+  mirror::String* string = shadow_frame->GetVRegReference(arg_offset)->AsString();
+  if (string == nullptr) {
+    AbortTransactionOrFail(self, "String.charAt with null object");
+    return;
+  }
+  result->SetC(string->CharAt(index));
+}
+
+// This allows creating the new style of String objects during compilation.
+static void UnstartedStringFactoryNewStringFromChars(
+    Thread* self, ShadowFrame* shadow_frame, JValue* result, size_t arg_offset)
+    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+  jint offset = shadow_frame->GetVReg(arg_offset);
+  jint char_count = shadow_frame->GetVReg(arg_offset + 1);
+  DCHECK_GE(char_count, 0);
+  StackHandleScope<1> hs(self);
+  Handle<mirror::CharArray> h_char_array(hs.NewHandle(shadow_frame->GetVRegReference(arg_offset + 2)->AsCharArray()));
+  Runtime* runtime = Runtime::Current();
+  gc::AllocatorType allocator = runtime->GetHeap()->GetCurrentAllocator();
+  result->SetL(mirror::String::AllocFromCharArray<true>(self, char_count, h_char_array, offset, allocator));
+}
+
+// This allows creating the new style of String objects during compilation.
+static void UnstartedStringFastSubstring(
+    Thread* self, ShadowFrame* shadow_frame, JValue* result, size_t arg_offset)
+    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+  jint start = shadow_frame->GetVReg(arg_offset + 1);
+  jint length = shadow_frame->GetVReg(arg_offset + 2);
+  DCHECK_GE(length, 0);
+  StackHandleScope<1> hs(self);
+  Handle<mirror::String> h_string(hs.NewHandle(shadow_frame->GetVRegReference(arg_offset)->AsString()));
+  Runtime* runtime = Runtime::Current();
+  gc::AllocatorType allocator = runtime->GetHeap()->GetCurrentAllocator();
+  result->SetL(mirror::String::AllocFromString<true>(self, length, h_string, start, allocator));
+}
+
 static void UnstartedJNIVMRuntimeNewUnpaddedArray(Thread* self,
                                                   mirror::ArtMethod* method ATTRIBUTE_UNUSED,
                                                   mirror::Object* receiver ATTRIBUTE_UNUSED,
@@ -1079,6 +1137,14 @@ static void UnstartedRuntimeInitializeInvokeHandlers() {
           &UnstartedMemoryPeekArrayEntry },
       { "java.io.Reader java.security.Security.getSecurityPropertiesReader()",
           &UnstartedSecurityGetSecurityPropertiesReader },
+      { "void java.lang.String.getCharsNoCheck(int, int, char[], int)",
+          &UnstartedStringGetCharsNoCheck },
+      { "char java.lang.String.charAt(int)",
+          &UnstartedStringCharAt },
+      { "java.lang.String java.lang.StringFactory.newStringFromChars(int, int, char[])",
+          &UnstartedStringFactoryNewStringFromChars },
+      { "java.lang.String java.lang.String.fastSubstring(int, int)",
+          &UnstartedStringFastSubstring },
   };
 
   for (auto& def : defs) {