| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ART_RUNTIME_VERIFIER_METHOD_VERIFIER_H_ |
| #define ART_RUNTIME_VERIFIER_METHOD_VERIFIER_H_ |
| |
| #include <set> |
| #include <vector> |
| |
| #include "base/casts.h" |
| #include "base/macros.h" |
| #include "base/stl_util.h" |
| #include "class_reference.h" |
| #include "dex_file.h" |
| #include "dex_instruction.h" |
| #include "instruction_flags.h" |
| #include "method_reference.h" |
| #include "mirror/object.h" |
| #include "reg_type.h" |
| #include "reg_type_cache-inl.h" |
| #include "register_line.h" |
| #include "safe_map.h" |
| #include "UniquePtr.h" |
| |
| namespace art { |
| |
| struct ReferenceMap2Visitor; |
| |
| namespace verifier { |
| |
| class MethodVerifier; |
| class DexPcToReferenceMap; |
| |
| /* |
| * "Direct" and "virtual" methods are stored independently. The type of call used to invoke the |
| * method determines which list we search, and whether we travel up into superclasses. |
| * |
| * (<clinit>, <init>, and methods declared "private" or "static" are stored in the "direct" list. |
| * All others are stored in the "virtual" list.) |
| */ |
| enum MethodType { |
| METHOD_UNKNOWN = 0, |
| METHOD_DIRECT, // <init>, private |
| METHOD_STATIC, // static |
| METHOD_VIRTUAL, // virtual, super |
| METHOD_INTERFACE // interface |
| }; |
| std::ostream& operator<<(std::ostream& os, const MethodType& rhs); |
| |
| /* |
| * An enumeration of problems that can turn up during verification. |
| * Both VERIFY_ERROR_BAD_CLASS_SOFT and VERIFY_ERROR_BAD_CLASS_HARD denote failures that cause |
| * the entire class to be rejected. However, VERIFY_ERROR_BAD_CLASS_SOFT denotes a soft failure |
| * that can potentially be corrected, and the verifier will try again at runtime. |
| * VERIFY_ERROR_BAD_CLASS_HARD denotes a hard failure that can't be corrected, and will cause |
| * the class to remain uncompiled. Other errors denote verification errors that cause bytecode |
| * to be rewritten to fail at runtime. |
| */ |
| enum VerifyError { |
| VERIFY_ERROR_BAD_CLASS_HARD, // VerifyError; hard error that skips compilation. |
| VERIFY_ERROR_BAD_CLASS_SOFT, // VerifyError; soft error that verifies again at runtime. |
| |
| VERIFY_ERROR_NO_CLASS, // NoClassDefFoundError. |
| VERIFY_ERROR_NO_FIELD, // NoSuchFieldError. |
| VERIFY_ERROR_NO_METHOD, // NoSuchMethodError. |
| VERIFY_ERROR_ACCESS_CLASS, // IllegalAccessError. |
| VERIFY_ERROR_ACCESS_FIELD, // IllegalAccessError. |
| VERIFY_ERROR_ACCESS_METHOD, // IllegalAccessError. |
| VERIFY_ERROR_CLASS_CHANGE, // IncompatibleClassChangeError. |
| VERIFY_ERROR_INSTANTIATION, // InstantiationError. |
| }; |
| std::ostream& operator<<(std::ostream& os, const VerifyError& rhs); |
| |
| /* |
| * Identifies the type of reference in the instruction that generated the verify error |
| * (e.g. VERIFY_ERROR_ACCESS_CLASS could come from a method, field, or class reference). |
| * |
| * This must fit in two bits. |
| */ |
| enum VerifyErrorRefType { |
| VERIFY_ERROR_REF_CLASS = 0, |
| VERIFY_ERROR_REF_FIELD = 1, |
| VERIFY_ERROR_REF_METHOD = 2, |
| }; |
| const int kVerifyErrorRefTypeShift = 6; |
| |
| // We don't need to store the register data for many instructions, because we either only need |
| // it at branch points (for verification) or GC points and branches (for verification + |
| // type-precise register analysis). |
| enum RegisterTrackingMode { |
| kTrackRegsBranches, |
| kTrackCompilerInterestPoints, |
| kTrackRegsAll, |
| }; |
| |
| // A mapping from a dex pc to the register line statuses as they are immediately prior to the |
| // execution of that instruction. |
| class PcToRegisterLineTable { |
| public: |
| PcToRegisterLineTable() {} |
| ~PcToRegisterLineTable() { |
| STLDeleteValues(&pc_to_register_line_); |
| } |
| |
| // Initialize the RegisterTable. Every instruction address can have a different set of information |
| // about what's in which register, but for verification purposes we only need to store it at |
| // branch target addresses (because we merge into that). |
| void Init(RegisterTrackingMode mode, InstructionFlags* flags, uint32_t insns_size, |
| uint16_t registers_size, MethodVerifier* verifier); |
| |
| RegisterLine* GetLine(size_t idx) { |
| auto result = pc_to_register_line_.find(idx); |
| if (result == pc_to_register_line_.end()) { |
| return NULL; |
| } else { |
| return result->second; |
| } |
| } |
| |
| private: |
| typedef SafeMap<int32_t, RegisterLine*> Table; |
| Table pc_to_register_line_; |
| }; |
| |
| // The verifier |
| class MethodVerifier { |
| public: |
| enum FailureKind { |
| kNoFailure, |
| kSoftFailure, |
| kHardFailure, |
| }; |
| |
| /* Verify a class. Returns "kNoFailure" on success. */ |
| static FailureKind VerifyClass(const mirror::Class* klass, bool allow_soft_failures, |
| std::string* error) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| static FailureKind VerifyClass(const DexFile* dex_file, mirror::DexCache* dex_cache, |
| mirror::ClassLoader* class_loader, |
| const DexFile::ClassDef* class_def, |
| bool allow_soft_failures, std::string* error) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| static void VerifyMethodAndDump(std::ostream& os, uint32_t method_idx, const DexFile* dex_file, |
| mirror::DexCache* dex_cache, mirror::ClassLoader* class_loader, |
| const DexFile::ClassDef* class_def, |
| const DexFile::CodeItem* code_item, |
| mirror::ArtMethod* method, uint32_t method_access_flags) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| uint8_t EncodePcToReferenceMapData() const; |
| |
| uint32_t DexFileVersion() const { |
| return dex_file_->GetVersion(); |
| } |
| |
| RegTypeCache* GetRegTypeCache() { |
| return ®_types_; |
| } |
| |
| // Log a verification failure. |
| std::ostream& Fail(VerifyError error); |
| |
| // Log for verification information. |
| std::ostream& LogVerifyInfo() { |
| return info_messages_ << "VFY: " << PrettyMethod(dex_method_idx_, *dex_file_) |
| << '[' << reinterpret_cast<void*>(work_insn_idx_) << "] : "; |
| } |
| |
| // Dump the failures encountered by the verifier. |
| std::ostream& DumpFailures(std::ostream& os); |
| |
| // Dump the state of the verifier, namely each instruction, what flags are set on it, register |
| // information |
| void Dump(std::ostream& os) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| static const std::vector<uint8_t>* GetDexGcMap(MethodReference ref) |
| LOCKS_EXCLUDED(dex_gc_maps_lock_); |
| |
| static const MethodReference* GetDevirtMap(const MethodReference& ref, uint32_t dex_pc) |
| LOCKS_EXCLUDED(devirt_maps_lock_); |
| |
| // Returns true if the cast can statically be verified to be redundant |
| // by using the check-cast elision peephole optimization in the verifier |
| static bool IsSafeCast(MethodReference ref, uint32_t pc) LOCKS_EXCLUDED(safecast_map_lock_); |
| |
| // Fills 'monitor_enter_dex_pcs' with the dex pcs of the monitor-enter instructions corresponding |
| // to the locks held at 'dex_pc' in method 'm'. |
| static void FindLocksAtDexPc(mirror::ArtMethod* m, uint32_t dex_pc, |
| std::vector<uint32_t>& monitor_enter_dex_pcs) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Returns the accessed field corresponding to the quick instruction's field |
| // offset at 'dex_pc' in method 'm'. |
| static mirror::ArtField* FindAccessedFieldAtDexPc(mirror::ArtMethod* m, uint32_t dex_pc) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Returns the invoked method corresponding to the quick instruction's vtable |
| // index at 'dex_pc' in method 'm'. |
| static mirror::ArtMethod* FindInvokedMethodAtDexPc(mirror::ArtMethod* m, uint32_t dex_pc) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| static void Init() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| static void Shutdown(); |
| |
| static bool IsClassRejected(ClassReference ref) |
| LOCKS_EXCLUDED(rejected_classes_lock_); |
| |
| bool CanLoadClasses() const { |
| return can_load_classes_; |
| } |
| |
| MethodVerifier(const DexFile* dex_file, mirror::DexCache* dex_cache, |
| mirror::ClassLoader* class_loader, const DexFile::ClassDef* class_def, |
| const DexFile::CodeItem* code_item, |
| uint32_t method_idx, mirror::ArtMethod* method, |
| uint32_t access_flags, bool can_load_classes, bool allow_soft_failures) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| ~MethodVerifier() { |
| STLDeleteElements(&failure_messages_); |
| } |
| |
| // Run verification on the method. Returns true if verification completes and false if the input |
| // has an irrecoverable corruption. |
| bool Verify() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Describe VRegs at the given dex pc. |
| std::vector<int32_t> DescribeVRegs(uint32_t dex_pc); |
| |
| static bool IsCandidateForCompilation(MethodReference& method_ref, |
| const uint32_t access_flags); |
| |
| private: |
| // Adds the given string to the beginning of the last failure message. |
| void PrependToLastFailMessage(std::string); |
| |
| // Adds the given string to the end of the last failure message. |
| void AppendToLastFailMessage(std::string); |
| |
| /* |
| * Perform verification on a single method. |
| * |
| * We do this in three passes: |
| * (1) Walk through all code units, determining instruction locations, |
| * widths, and other characteristics. |
| * (2) Walk through all code units, performing static checks on |
| * operands. |
| * (3) Iterate through the method, checking type safety and looking |
| * for code flow problems. |
| */ |
| static FailureKind VerifyMethod(uint32_t method_idx, const DexFile* dex_file, |
| mirror::DexCache* dex_cache, |
| mirror::ClassLoader* class_loader, |
| const DexFile::ClassDef* class_def_idx, |
| const DexFile::CodeItem* code_item, |
| mirror::ArtMethod* method, uint32_t method_access_flags, |
| bool allow_soft_failures) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| void FindLocksAtDexPc() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| mirror::ArtField* FindAccessedFieldAtDexPc(uint32_t dex_pc) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| mirror::ArtMethod* FindInvokedMethodAtDexPc(uint32_t dex_pc) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| /* |
| * Compute the width of the instruction at each address in the instruction stream, and store it in |
| * insn_flags_. Addresses that are in the middle of an instruction, or that are part of switch |
| * table data, are not touched (so the caller should probably initialize "insn_flags" to zero). |
| * |
| * The "new_instance_count_" and "monitor_enter_count_" fields in vdata are also set. |
| * |
| * Performs some static checks, notably: |
| * - opcode of first instruction begins at index 0 |
| * - only documented instructions may appear |
| * - each instruction follows the last |
| * - last byte of last instruction is at (code_length-1) |
| * |
| * Logs an error and returns "false" on failure. |
| */ |
| bool ComputeWidthsAndCountOps(); |
| |
| /* |
| * Set the "in try" flags for all instructions protected by "try" statements. Also sets the |
| * "branch target" flags for exception handlers. |
| * |
| * Call this after widths have been set in "insn_flags". |
| * |
| * Returns "false" if something in the exception table looks fishy, but we're expecting the |
| * exception table to be somewhat sane. |
| */ |
| bool ScanTryCatchBlocks() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| /* |
| * Perform static verification on all instructions in a method. |
| * |
| * Walks through instructions in a method calling VerifyInstruction on each. |
| */ |
| bool VerifyInstructions(); |
| |
| /* |
| * Perform static verification on an instruction. |
| * |
| * As a side effect, this sets the "branch target" flags in InsnFlags. |
| * |
| * "(CF)" items are handled during code-flow analysis. |
| * |
| * v3 4.10.1 |
| * - target of each jump and branch instruction must be valid |
| * - targets of switch statements must be valid |
| * - operands referencing constant pool entries must be valid |
| * - (CF) operands of getfield, putfield, getstatic, putstatic must be valid |
| * - (CF) operands of method invocation instructions must be valid |
| * - (CF) only invoke-direct can call a method starting with '<' |
| * - (CF) <clinit> must never be called explicitly |
| * - operands of instanceof, checkcast, new (and variants) must be valid |
| * - new-array[-type] limited to 255 dimensions |
| * - can't use "new" on an array class |
| * - (?) limit dimensions in multi-array creation |
| * - local variable load/store register values must be in valid range |
| * |
| * v3 4.11.1.2 |
| * - branches must be within the bounds of the code array |
| * - targets of all control-flow instructions are the start of an instruction |
| * - register accesses fall within range of allocated registers |
| * - (N/A) access to constant pool must be of appropriate type |
| * - code does not end in the middle of an instruction |
| * - execution cannot fall off the end of the code |
| * - (earlier) for each exception handler, the "try" area must begin and |
| * end at the start of an instruction (end can be at the end of the code) |
| * - (earlier) for each exception handler, the handler must start at a valid |
| * instruction |
| */ |
| bool VerifyInstruction(const Instruction* inst, uint32_t code_offset); |
| |
| /* Ensure that the register index is valid for this code item. */ |
| bool CheckRegisterIndex(uint32_t idx); |
| |
| /* Ensure that the wide register index is valid for this code item. */ |
| bool CheckWideRegisterIndex(uint32_t idx); |
| |
| // Perform static checks on a field get or set instruction. All we do here is ensure that the |
| // field index is in the valid range. |
| bool CheckFieldIndex(uint32_t idx); |
| |
| // Perform static checks on a method invocation instruction. All we do here is ensure that the |
| // method index is in the valid range. |
| bool CheckMethodIndex(uint32_t idx); |
| |
| // Perform static checks on a "new-instance" instruction. Specifically, make sure the class |
| // reference isn't for an array class. |
| bool CheckNewInstance(uint32_t idx); |
| |
| /* Ensure that the string index is in the valid range. */ |
| bool CheckStringIndex(uint32_t idx); |
| |
| // Perform static checks on an instruction that takes a class constant. Ensure that the class |
| // index is in the valid range. |
| bool CheckTypeIndex(uint32_t idx); |
| |
| // Perform static checks on a "new-array" instruction. Specifically, make sure they aren't |
| // creating an array of arrays that causes the number of dimensions to exceed 255. |
| bool CheckNewArray(uint32_t idx); |
| |
| // Verify an array data table. "cur_offset" is the offset of the fill-array-data instruction. |
| bool CheckArrayData(uint32_t cur_offset); |
| |
| // Verify that the target of a branch instruction is valid. We don't expect code to jump directly |
| // into an exception handler, but it's valid to do so as long as the target isn't a |
| // "move-exception" instruction. We verify that in a later stage. |
| // The dex format forbids certain instructions from branching to themselves. |
| // Updates "insn_flags_", setting the "branch target" flag. |
| bool CheckBranchTarget(uint32_t cur_offset); |
| |
| // Verify a switch table. "cur_offset" is the offset of the switch instruction. |
| // Updates "insn_flags_", setting the "branch target" flag. |
| bool CheckSwitchTargets(uint32_t cur_offset); |
| |
| // Check the register indices used in a "vararg" instruction, such as invoke-virtual or |
| // filled-new-array. |
| // - vA holds word count (0-5), args[] have values. |
| // There are some tests we don't do here, e.g. we don't try to verify that invoking a method that |
| // takes a double is done with consecutive registers. This requires parsing the target method |
| // signature, which we will be doing later on during the code flow analysis. |
| bool CheckVarArgRegs(uint32_t vA, uint32_t arg[]); |
| |
| // Check the register indices used in a "vararg/range" instruction, such as invoke-virtual/range |
| // or filled-new-array/range. |
| // - vA holds word count, vC holds index of first reg. |
| bool CheckVarArgRangeRegs(uint32_t vA, uint32_t vC); |
| |
| // Extract the relative offset from a branch instruction. |
| // Returns "false" on failure (e.g. this isn't a branch instruction). |
| bool GetBranchOffset(uint32_t cur_offset, int32_t* pOffset, bool* pConditional, |
| bool* selfOkay); |
| |
| /* Perform detailed code-flow analysis on a single method. */ |
| bool VerifyCodeFlow() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Set the register types for the first instruction in the method based on the method signature. |
| // This has the side-effect of validating the signature. |
| bool SetTypesFromSignature() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| /* |
| * Perform code flow on a method. |
| * |
| * The basic strategy is as outlined in v3 4.11.1.2: set the "changed" bit on the first |
| * instruction, process it (setting additional "changed" bits), and repeat until there are no |
| * more. |
| * |
| * v3 4.11.1.1 |
| * - (N/A) operand stack is always the same size |
| * - operand stack [registers] contain the correct types of values |
| * - local variables [registers] contain the correct types of values |
| * - methods are invoked with the appropriate arguments |
| * - fields are assigned using values of appropriate types |
| * - opcodes have the correct type values in operand registers |
| * - there is never an uninitialized class instance in a local variable in code protected by an |
| * exception handler (operand stack is okay, because the operand stack is discarded when an |
| * exception is thrown) [can't know what's a local var w/o the debug info -- should fall out of |
| * register typing] |
| * |
| * v3 4.11.1.2 |
| * - execution cannot fall off the end of the code |
| * |
| * (We also do many of the items described in the "static checks" sections, because it's easier to |
| * do them here.) |
| * |
| * We need an array of RegType values, one per register, for every instruction. If the method uses |
| * monitor-enter, we need extra data for every register, and a stack for every "interesting" |
| * instruction. In theory this could become quite large -- up to several megabytes for a monster |
| * function. |
| * |
| * NOTE: |
| * The spec forbids backward branches when there's an uninitialized reference in a register. The |
| * idea is to prevent something like this: |
| * loop: |
| * move r1, r0 |
| * new-instance r0, MyClass |
| * ... |
| * if-eq rN, loop // once |
| * initialize r0 |
| * |
| * This leaves us with two different instances, both allocated by the same instruction, but only |
| * one is initialized. The scheme outlined in v3 4.11.1.4 wouldn't catch this, so they work around |
| * it by preventing backward branches. We achieve identical results without restricting code |
| * reordering by specifying that you can't execute the new-instance instruction if a register |
| * contains an uninitialized instance created by that same instruction. |
| */ |
| bool CodeFlowVerifyMethod() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| /* |
| * Perform verification for a single instruction. |
| * |
| * This requires fully decoding the instruction to determine the effect it has on registers. |
| * |
| * Finds zero or more following instructions and sets the "changed" flag if execution at that |
| * point needs to be (re-)evaluated. Register changes are merged into "reg_types_" at the target |
| * addresses. Does not set or clear any other flags in "insn_flags_". |
| */ |
| bool CodeFlowVerifyInstruction(uint32_t* start_guess) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Perform verification of a new array instruction |
| void VerifyNewArray(const Instruction* inst, bool is_filled, bool is_range) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Helper to perform verification on puts of primitive type. |
| void VerifyPrimitivePut(const RegType& target_type, const RegType& insn_type, |
| const uint32_t vregA) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Perform verification of an aget instruction. The destination register's type will be set to |
| // be that of component type of the array unless the array type is unknown, in which case a |
| // bottom type inferred from the type of instruction is used. is_primitive is false for an |
| // aget-object. |
| void VerifyAGet(const Instruction* inst, const RegType& insn_type, |
| bool is_primitive) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Perform verification of an aput instruction. |
| void VerifyAPut(const Instruction* inst, const RegType& insn_type, |
| bool is_primitive) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Lookup instance field and fail for resolution violations |
| mirror::ArtField* GetInstanceField(const RegType& obj_type, int field_idx) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Lookup static field and fail for resolution violations |
| mirror::ArtField* GetStaticField(int field_idx) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Perform verification of an iget or sget instruction. |
| void VerifyISGet(const Instruction* inst, const RegType& insn_type, |
| bool is_primitive, bool is_static) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Perform verification of an iput or sput instruction. |
| void VerifyISPut(const Instruction* inst, const RegType& insn_type, |
| bool is_primitive, bool is_static) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Returns the access field of a quick field access (iget/iput-quick) or NULL |
| // if it cannot be found. |
| mirror::ArtField* GetQuickFieldAccess(const Instruction* inst, RegisterLine* reg_line) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Perform verification of an iget-quick instruction. |
| void VerifyIGetQuick(const Instruction* inst, const RegType& insn_type, |
| bool is_primitive) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Perform verification of an iput-quick instruction. |
| void VerifyIPutQuick(const Instruction* inst, const RegType& insn_type, |
| bool is_primitive) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Resolves a class based on an index and performs access checks to ensure the referrer can |
| // access the resolved class. |
| const RegType& ResolveClassAndCheckAccess(uint32_t class_idx) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| /* |
| * For the "move-exception" instruction at "work_insn_idx_", which must be at an exception handler |
| * address, determine the Join of all exceptions that can land here. Fails if no matching |
| * exception handler can be found or if the Join of exception types fails. |
| */ |
| const RegType& GetCaughtExceptionType() |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| /* |
| * Resolves a method based on an index and performs access checks to ensure |
| * the referrer can access the resolved method. |
| * Does not throw exceptions. |
| */ |
| mirror::ArtMethod* ResolveMethodAndCheckAccess(uint32_t method_idx, MethodType method_type) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| /* |
| * Verify the arguments to a method. We're executing in "method", making |
| * a call to the method reference in vB. |
| * |
| * If this is a "direct" invoke, we allow calls to <init>. For calls to |
| * <init>, the first argument may be an uninitialized reference. Otherwise, |
| * calls to anything starting with '<' will be rejected, as will any |
| * uninitialized reference arguments. |
| * |
| * For non-static method calls, this will verify that the method call is |
| * appropriate for the "this" argument. |
| * |
| * The method reference is in vBBBB. The "is_range" parameter determines |
| * whether we use 0-4 "args" values or a range of registers defined by |
| * vAA and vCCCC. |
| * |
| * Widening conversions on integers and references are allowed, but |
| * narrowing conversions are not. |
| * |
| * Returns the resolved method on success, NULL on failure (with *failure |
| * set appropriately). |
| */ |
| mirror::ArtMethod* VerifyInvocationArgs(const Instruction* inst, |
| MethodType method_type, |
| bool is_range, bool is_super) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| mirror::ArtMethod* GetQuickInvokedMethod(const Instruction* inst, |
| RegisterLine* reg_line, |
| bool is_range) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| mirror::ArtMethod* VerifyInvokeVirtualQuickArgs(const Instruction* inst, bool is_range) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| /* |
| * Verify that the target instruction is not "move-exception". It's important that the only way |
| * to execute a move-exception is as the first instruction of an exception handler. |
| * Returns "true" if all is well, "false" if the target instruction is move-exception. |
| */ |
| bool CheckNotMoveException(const uint16_t* insns, int insn_idx); |
| |
| /* |
| * Control can transfer to "next_insn". Merge the registers from merge_line into the table at |
| * next_insn, and set the changed flag on the target address if any of the registers were changed. |
| * Returns "false" if an error is encountered. |
| */ |
| bool UpdateRegisters(uint32_t next_insn, const RegisterLine* merge_line) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Is the method being verified a constructor? |
| bool IsConstructor() const { |
| return (method_access_flags_ & kAccConstructor) != 0; |
| } |
| |
| // Is the method verified static? |
| bool IsStatic() const { |
| return (method_access_flags_ & kAccStatic) != 0; |
| } |
| |
| // Return the register type for the method. |
| const RegType& GetMethodReturnType() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Get a type representing the declaring class of the method. |
| const RegType& GetDeclaringClass() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| /* |
| * Generate the GC map for a method that has just been verified (i.e. we're doing this as part of |
| * verification). For type-precise determination we have all the data we need, so we just need to |
| * encode it in some clever fashion. |
| * Returns a pointer to a newly-allocated RegisterMap, or NULL on failure. |
| */ |
| const std::vector<uint8_t>* GenerateGcMap(); |
| |
| // Verify that the GC map associated with method_ is well formed |
| void VerifyGcMap(const std::vector<uint8_t>& data); |
| |
| // Compute sizes for GC map data |
| void ComputeGcMapSizes(size_t* gc_points, size_t* ref_bitmap_bits, size_t* log2_max_gc_pc); |
| |
| InstructionFlags* CurrentInsnFlags(); |
| |
| // All the GC maps that the verifier has created |
| typedef SafeMap<const MethodReference, const std::vector<uint8_t>*, |
| MethodReferenceComparator> DexGcMapTable; |
| static ReaderWriterMutex* dex_gc_maps_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; |
| static DexGcMapTable* dex_gc_maps_ GUARDED_BY(dex_gc_maps_lock_); |
| static void SetDexGcMap(MethodReference ref, const std::vector<uint8_t>& dex_gc_map) |
| LOCKS_EXCLUDED(dex_gc_maps_lock_); |
| |
| |
| // Cast elision types. |
| typedef std::set<uint32_t> MethodSafeCastSet; |
| typedef SafeMap<const MethodReference, const MethodSafeCastSet*, |
| MethodReferenceComparator> SafeCastMap; |
| MethodVerifier::MethodSafeCastSet* GenerateSafeCastSet() |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| static void SetSafeCastMap(MethodReference ref, const MethodSafeCastSet* mscs); |
| LOCKS_EXCLUDED(safecast_map_lock_); |
| static ReaderWriterMutex* safecast_map_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; |
| static SafeCastMap* safecast_map_ GUARDED_BY(safecast_map_lock_); |
| |
| // Devirtualization map. |
| typedef SafeMap<const uint32_t, MethodReference> PcToConcreteMethodMap; |
| typedef SafeMap<const MethodReference, const PcToConcreteMethodMap*, |
| MethodReferenceComparator> DevirtualizationMapTable; |
| MethodVerifier::PcToConcreteMethodMap* GenerateDevirtMap() |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| static ReaderWriterMutex* devirt_maps_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; |
| static DevirtualizationMapTable* devirt_maps_ GUARDED_BY(devirt_maps_lock_); |
| static void SetDevirtMap(MethodReference ref, |
| const PcToConcreteMethodMap* pc_method_map) |
| LOCKS_EXCLUDED(devirt_maps_lock_); |
| typedef std::set<ClassReference> RejectedClassesTable; |
| static ReaderWriterMutex* rejected_classes_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; |
| static RejectedClassesTable* rejected_classes_ GUARDED_BY(rejected_classes_lock_); |
| |
| static void AddRejectedClass(ClassReference ref) |
| LOCKS_EXCLUDED(rejected_classes_lock_); |
| |
| RegTypeCache reg_types_; |
| |
| PcToRegisterLineTable reg_table_; |
| |
| // Storage for the register status we're currently working on. |
| UniquePtr<RegisterLine> work_line_; |
| |
| // The address of the instruction we're currently working on, note that this is in 2 byte |
| // quantities |
| uint32_t work_insn_idx_; |
| |
| // Storage for the register status we're saving for later. |
| UniquePtr<RegisterLine> saved_line_; |
| |
| const uint32_t dex_method_idx_; // The method we're working on. |
| // Its object representation if known. |
| mirror::ArtMethod* mirror_method_ GUARDED_BY(Locks::mutator_lock_); |
| const uint32_t method_access_flags_; // Method's access flags. |
| const RegType* return_type_; // Lazily computed return type of the method. |
| const DexFile* const dex_file_; // The dex file containing the method. |
| // The dex_cache for the declaring class of the method. |
| mirror::DexCache* dex_cache_ GUARDED_BY(Locks::mutator_lock_); |
| // The class loader for the declaring class of the method. |
| mirror::ClassLoader* class_loader_ GUARDED_BY(Locks::mutator_lock_); |
| const DexFile::ClassDef* const class_def_; // The class def of the declaring class of the method. |
| const DexFile::CodeItem* const code_item_; // The code item containing the code for the method. |
| const RegType* declaring_class_; // Lazily computed reg type of the method's declaring class. |
| // Instruction widths and flags, one entry per code unit. |
| UniquePtr<InstructionFlags[]> insn_flags_; |
| // The dex PC of a FindLocksAtDexPc request, -1 otherwise. |
| uint32_t interesting_dex_pc_; |
| // The container into which FindLocksAtDexPc should write the registers containing held locks, |
| // NULL if we're not doing FindLocksAtDexPc. |
| std::vector<uint32_t>* monitor_enter_dex_pcs_; |
| |
| // The types of any error that occurs. |
| std::vector<VerifyError> failures_; |
| // Error messages associated with failures. |
| std::vector<std::ostringstream*> failure_messages_; |
| // Is there a pending hard failure? |
| bool have_pending_hard_failure_; |
| // Is there a pending runtime throw failure? A runtime throw failure is when an instruction |
| // would fail at runtime throwing an exception. Such an instruction causes the following code |
| // to be unreachable. This is set by Fail and used to ensure we don't process unreachable |
| // instructions that would hard fail the verification. |
| bool have_pending_runtime_throw_failure_; |
| |
| // Info message log use primarily for verifier diagnostics. |
| std::ostringstream info_messages_; |
| |
| // The number of occurrences of specific opcodes. |
| size_t new_instance_count_; |
| size_t monitor_enter_count_; |
| |
| const bool can_load_classes_; |
| |
| // Converts soft failures to hard failures when false. Only false when the compiler isn't |
| // running and the verifier is called from the class linker. |
| const bool allow_soft_failures_; |
| |
| // Indicates if the method being verified contains at least one check-cast instruction. |
| bool has_check_casts_; |
| |
| // Indicates if the method being verified contains at least one invoke-virtual/range |
| // or invoke-interface/range. |
| bool has_virtual_or_interface_invokes_; |
| }; |
| std::ostream& operator<<(std::ostream& os, const MethodVerifier::FailureKind& rhs); |
| |
| } // namespace verifier |
| } // namespace art |
| |
| #endif // ART_RUNTIME_VERIFIER_METHOD_VERIFIER_H_ |