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// Copyright 2011 Google Inc. All Rights Reserved.
#include "compiled_method.h"
#include "constants.h"
#include "dex_cache.h"
#include "dex_file.h"
#include "jni_compiler.h"
#include "oat_file.h"
#include "object.h"
#include "runtime.h"
#include "unordered_map.h"
#include <string>
namespace art {
class Compiler {
// Create a compiler targeting the requested "instruction_set".
// "image" should be true if image specific optimizations should be enabled.
explicit Compiler(InstructionSet instruction_set, bool image);
void CompileAll(const ClassLoader* class_loader,
const std::vector<const DexFile*>& class_path);
// Compile a single Method
void CompileOne(const Method* method);
InstructionSet GetInstructionSet() const {
return instruction_set_;
bool IsImage() const {
return image_;
void SetVerbose(bool verbose) {
verbose_ = verbose;
bool IsVerbose() const {
return verbose_;
// Stub to throw AbstractMethodError
static ByteArray* CreateAbstractMethodErrorStub(InstructionSet instruction_set);
// Generate the trampoline that's invoked by unresolved direct methods
static ByteArray* CreateResolutionStub(InstructionSet instruction_set,
Runtime::TrampolineType type);
static ByteArray* CreateJniDlysmLookupStub(InstructionSet instruction_set);
// A method is uniquely located by its DexFile and index into the method_id table of that dex file
typedef std::pair<const DexFile*, uint32_t> MethodReference;
CompiledMethod* GetCompiledMethod(MethodReference ref) const;
const CompiledInvokeStub* FindInvokeStub(bool is_static, const char* shorty) const;
// Callbacks from OAT/ART compiler to see what runtime checks must be generated
bool CanAssumeTypeIsPresentInDexCache(const DexCache* dex_cache, uint32_t type_idx) const {
return IsImage() && dex_cache->GetResolvedTypes()->Get(type_idx) != NULL;
bool CanAssumeStringIsPresentInDexCache(const DexCache* dex_cache, uint32_t string_idx) const {
return IsImage() && dex_cache->GetStrings()->Get(string_idx) != NULL;
bool CanAccessTypeWithoutChecks(uint32_t referrer_idx, const DexCache* dex_cache,
const DexFile& dex_file, uint32_t type_idx) const {
Class* resolved_class = dex_cache->GetResolvedTypes()->Get(type_idx);
// We should never ask whether a type needs access checks to raise a verification error,
// all other cases where this following test could fail should have been rewritten by the
// verifier to verification errors. Also need to handle a lack of knowledge at compile time.
#ifndef NDEBUG
Class* referrer_class = dex_cache->GetResolvedTypes()
DCHECK(resolved_class == NULL || referrer_class == NULL ||
return resolved_class != NULL;
// Attempt to resolve all type, methods, fields, and strings
// referenced from code in the dex file following PathClassLoader
// ordering semantics.
void Resolve(const ClassLoader* class_loader);
void ResolveDexFile(const ClassLoader* class_loader, const DexFile& dex_file);
void Verify(const ClassLoader* class_loader);
void VerifyDexFile(const ClassLoader* class_loader, const DexFile& dex_file);
void InitializeClassesWithoutClinit(const ClassLoader* class_loader);
void InitializeClassesWithoutClinit(const ClassLoader* class_loader, const DexFile& dex_file);
void Compile(const ClassLoader* class_loader);
void CompileDexFile(const ClassLoader* class_loader, const DexFile& dex_file);
void CompileClass(const DexFile::ClassDef& class_def, const ClassLoader* class_loader,
const DexFile& dex_file);
void CompileMethod(const DexFile::CodeItem* code_item, uint32_t access_flags, uint32_t method_idx,
const ClassLoader* class_loader, const DexFile& dex_file);
// After compiling, walk all the DexCaches and set the code and
// method pointers of CodeAndDirectMethods entries in the DexCaches.
void SetCodeAndDirectMethods(const ClassLoader* class_loader);
void SetCodeAndDirectMethodsDexFile(const DexFile& dex_file);
void InsertInvokeStub(bool is_static, const char* shorty,
const CompiledInvokeStub* compiled_invoke_stub);
InstructionSet instruction_set_;
JniCompiler jni_compiler_;
struct MethodReferenceHash {
size_t operator()(const MethodReference id) const {
size_t dex = reinterpret_cast<size_t>(id.first);
DCHECK_NE(dex, static_cast<size_t>(0));
dex += 33; // dex is an aligned pointer, get some non-zero low bits
size_t idx = id.second;
if (idx == 0) { // special case of a method index of 0
return dex * 5381;
} else {
return dex * idx;
typedef std::tr1::unordered_map<const MethodReference, CompiledMethod*, MethodReferenceHash> MethodTable;
// All method references that this compiler has compiled
MethodTable compiled_methods_;
typedef std::tr1::unordered_map<std::string, const CompiledInvokeStub*> InvokeStubTable;
// Invocation stubs created to allow invocation of the compiled methods
InvokeStubTable compiled_invoke_stubs_;
bool image_;
bool verbose_;
} // namespace art