From e47f60c482648172334aaca59e6c1ab7a3d42610 Mon Sep 17 00:00:00 2001
From: Vladimir Marko <vmarko@google.com>
Date: Wed, 21 Feb 2018 13:43:28 +0000
Subject: Retrieve String/Class references from .data.bimg.rel.ro.

For PIC AOT-compiled app, use the .data.bimg.rel.ro to load
the boot image String/Class references instead of using the
mmapped boot image ClassTable and InternTable.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing --pictest --npictest
Test: Pixel 2 XL boots.
Test: testrunner.py --target --optimizing --pictest --npictest
Bug: 71526895
Change-Id: Id5703229777aecb589a933a41f92e44d3ec02a3d
---
 compiler/optimizing/code_generator.cc | 43 +++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

(limited to 'compiler/optimizing/code_generator.cc')

diff --git a/compiler/optimizing/code_generator.cc b/compiler/optimizing/code_generator.cc
index ff59173c8b..0fcc9c6d05 100644
--- a/compiler/optimizing/code_generator.cc
+++ b/compiler/optimizing/code_generator.cc
@@ -51,6 +51,8 @@
 #include "dex/verified_method.h"
 #include "driver/compiler_driver.h"
 #include "graph_visualizer.h"
+#include "image.h"
+#include "gc/space/image_space.h"
 #include "intern_table.h"
 #include "intrinsics.h"
 #include "mirror/array-inl.h"
@@ -722,6 +724,47 @@ void CodeGenerator::GenerateLoadClassRuntimeCall(HLoadClass* cls) {
   }
 }
 
+static uint32_t GetBootImageOffsetImpl(const void* object, ImageHeader::ImageSections section) {
+  Runtime* runtime = Runtime::Current();
+  DCHECK(runtime->IsAotCompiler());
+  const std::vector<gc::space::ImageSpace*>& boot_image_spaces =
+      runtime->GetHeap()->GetBootImageSpaces();
+  // Check that the `object` is in the expected section of one of the boot image files.
+  DCHECK(std::any_of(boot_image_spaces.begin(),
+                     boot_image_spaces.end(),
+                     [object, section](gc::space::ImageSpace* space) {
+                       uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin());
+                       uintptr_t offset = reinterpret_cast<uintptr_t>(object) - begin;
+                       return space->GetImageHeader().GetImageSection(section).Contains(offset);
+                     }));
+  uintptr_t begin = reinterpret_cast<uintptr_t>(boot_image_spaces.front()->Begin());
+  uintptr_t offset = reinterpret_cast<uintptr_t>(object) - begin;
+  return dchecked_integral_cast<uint32_t>(offset);
+}
+
+// NO_THREAD_SAFETY_ANALYSIS: Avoid taking the mutator lock, boot image classes are non-moveable.
+uint32_t CodeGenerator::GetBootImageOffset(HLoadClass* load_class) NO_THREAD_SAFETY_ANALYSIS {
+  DCHECK_EQ(load_class->GetLoadKind(), HLoadClass::LoadKind::kBootImageRelRo);
+  ObjPtr<mirror::Class> klass = load_class->GetClass().Get();
+  DCHECK(klass != nullptr);
+  return GetBootImageOffsetImpl(klass.Ptr(), ImageHeader::kSectionObjects);
+}
+
+// NO_THREAD_SAFETY_ANALYSIS: Avoid taking the mutator lock, boot image strings are non-moveable.
+uint32_t CodeGenerator::GetBootImageOffset(HLoadString* load_string) NO_THREAD_SAFETY_ANALYSIS {
+  DCHECK_EQ(load_string->GetLoadKind(), HLoadString::LoadKind::kBootImageRelRo);
+  ObjPtr<mirror::String> string = load_string->GetString().Get();
+  DCHECK(string != nullptr);
+  return GetBootImageOffsetImpl(string.Ptr(), ImageHeader::kSectionObjects);
+}
+
+uint32_t CodeGenerator::GetBootImageOffset(HInvokeStaticOrDirect* invoke) {
+  DCHECK_EQ(invoke->GetMethodLoadKind(), HInvokeStaticOrDirect::MethodLoadKind::kBootImageRelRo);
+  ArtMethod* method = invoke->GetResolvedMethod();
+  DCHECK(method != nullptr);
+  return GetBootImageOffsetImpl(method, ImageHeader::kSectionArtMethods);
+}
+
 void CodeGenerator::BlockIfInRegister(Location location, bool is_out) const {
   // The DCHECKS below check that a register is not specified twice in
   // the summary. The out location can overlap with an input, so we need
-- 
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