Move the dexfile support to implementation.

No longer require that NO_LIBDEXFILE_SUPPORT be defined or not
defined when including the header files. Move all of the different
behavior to the implementation, and keep all of the classes the
exact same whether dexfiles are supported or not.

Bug: 144470551

Test: Ran libunwindstack unit tests, libbacktrace unit tests, and
Test: debuggerd unit tests.
Test: Ran host art 137-cfi tests.
Change-Id: I4a04cfbc5d4f1bf765ef154881046c85057006c8

libunwindstack/Android.bp

@@ -77,6 +77,7 @@ cc_library {
     ],
 
     cflags: [
+        "-DDEXFILE_SUPPORT",
         "-Wexit-time-destructors",
     ],
 
@@ -89,20 +90,18 @@ cc_library {
             ],
         },
         vendor: {
-            cflags: ["-DNO_LIBDEXFILE_SUPPORT"],
+            cflags: ["-UDEXFILE_SUPPORT"],
             exclude_srcs: [
                 "DexFile.cpp",
-                "DexFiles.cpp",
             ],
             exclude_shared_libs: [
                 "libdexfile_support",
             ],
         },
         recovery: {
-            cflags: ["-DNO_LIBDEXFILE_SUPPORT"],
+            cflags: ["-UDEXFILE_SUPPORT"],
             exclude_srcs: [
                 "DexFile.cpp",
-                "DexFiles.cpp",
             ],
             exclude_shared_libs: [
                 "libdexfile_support",

libunwindstack/DexFiles.cpp

@@ -27,10 +27,21 @@
 #include <unwindstack/Maps.h>
 #include <unwindstack/Memory.h>
 
+#if defined(DEXFILE_SUPPORT)
 #include "DexFile.h"
+#endif
 
 namespace unwindstack {
 
+#if !defined(DEXFILE_SUPPORT)
+// Empty class definition.
+class DexFile {
+ public:
+  DexFile() = default;
+  virtual ~DexFile() = default;
+};
+#endif
+
 struct DEXFileEntry32 {
   uint32_t next;
   uint32_t prev;
@@ -128,6 +139,7 @@ void DexFiles::Init(Maps* maps) {
   FindAndReadVariable(maps, "__dex_debug_descriptor");
 }
 
+#if defined(DEXFILE_SUPPORT)
 DexFile* DexFiles::GetDexFile(uint64_t dex_file_offset, MapInfo* info) {
   // Lock while processing the data.
   DexFile* dex_file;
@@ -141,6 +153,11 @@ DexFile* DexFiles::GetDexFile(uint64_t dex_file_offset, MapInfo* info) {
   }
   return dex_file;
 }
+#else
+DexFile* DexFiles::GetDexFile(uint64_t, MapInfo*) {
+  return nullptr;
+}
+#endif
 
 bool DexFiles::GetAddr(size_t index, uint64_t* addr) {
   if (index < addrs_.size()) {
@@ -154,6 +171,7 @@ bool DexFiles::GetAddr(size_t index, uint64_t* addr) {
   return false;
 }
 
+#if defined(DEXFILE_SUPPORT)
 void DexFiles::GetMethodInformation(Maps* maps, MapInfo* info, uint64_t dex_pc,
                                     std::string* method_name, uint64_t* method_offset) {
   std::lock_guard<std::mutex> guard(lock_);
@@ -175,5 +193,8 @@ void DexFiles::GetMethodInformation(Maps* maps, MapInfo* info, uint64_t dex_pc,
     }
   }
 }
+#else
+void DexFiles::GetMethodInformation(Maps*, MapInfo*, uint64_t, std::string*, uint64_t*) {}
+#endif
 
 }  // namespace unwindstack

libunwindstack/Unwinder.cpp

@@ -34,9 +34,7 @@
 #include <unwindstack/Memory.h>
 #include <unwindstack/Unwinder.h>
 
-#if !defined(NO_LIBDEXFILE_SUPPORT)
 #include <unwindstack/DexFiles.h>
-#endif
 
 // Use the demangler from libc++.
 extern "C" char* __cxa_demangle(const char*, char*, size_t*, int* status);
@@ -84,7 +82,7 @@ void Unwinder::FillInDexFrame() {
     return;
   }
 
-#if !defined(NO_LIBDEXFILE_SUPPORT)
+#if defined(DEXFILE_SUPPORT)
   if (dex_files_ == nullptr) {
     return;
   }
@@ -367,12 +365,10 @@ void Unwinder::SetJitDebug(JitDebug* jit_debug, ArchEnum arch) {
   jit_debug_ = jit_debug;
 }
 
-#if !defined(NO_LIBDEXFILE_SUPPORT)
 void Unwinder::SetDexFiles(DexFiles* dex_files, ArchEnum arch) {
   dex_files->SetArch(arch);
   dex_files_ = dex_files;
 }
-#endif
 
 bool UnwinderFromPid::Init(ArchEnum arch) {
   if (pid_ == getpid()) {
@@ -390,7 +386,7 @@ bool UnwinderFromPid::Init(ArchEnum arch) {
   jit_debug_ptr_.reset(new JitDebug(process_memory_));
   jit_debug_ = jit_debug_ptr_.get();
   SetJitDebug(jit_debug_, arch);
-#if !defined(NO_LIBDEXFILE_SUPPORT)
+#if defined(DEXFILE_SUPPORT)
   dex_files_ptr_.reset(new DexFiles(process_memory_));
   dex_files_ = dex_files_ptr_.get();
   SetDexFiles(dex_files_, arch);

libunwindstack/include/unwindstack/Unwinder.h

@@ -107,9 +107,7 @@ class Unwinder {
 
   void SetDisplayBuildID(bool display_build_id) { display_build_id_ = display_build_id; }
 
-#if !defined(NO_LIBDEXFILE_SUPPORT)
   void SetDexFiles(DexFiles* dex_files, ArchEnum arch);
-#endif
 
   bool elf_from_memory_not_file() { return elf_from_memory_not_file_; }
 
@@ -128,9 +126,7 @@ class Unwinder {
   std::vector<FrameData> frames_;
   std::shared_ptr<Memory> process_memory_;
   JitDebug* jit_debug_ = nullptr;
-#if !defined(NO_LIBDEXFILE_SUPPORT)
   DexFiles* dex_files_ = nullptr;
-#endif
   bool resolve_names_ = true;
   bool embedded_soname_ = true;
   bool display_build_id_ = false;
@@ -151,9 +147,7 @@ class UnwinderFromPid : public Unwinder {
   pid_t pid_;
   std::unique_ptr<Maps> maps_ptr_;
   std::unique_ptr<JitDebug> jit_debug_ptr_;
-#if !defined(NO_LIBDEXFILE_SUPPORT)
   std::unique_ptr<DexFiles> dex_files_ptr_;
-#endif
 };
 
 }  // namespace unwindstack