JDK14/Java14源码在线阅读
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#ifndef SHARE_CODE_NMETHOD_HPP
#define SHARE_CODE_NMETHOD_HPP
#include "code/compiledMethod.hpp"
class DepChange;
class DirectiveSet;
class DebugInformationRecorder;
class JvmtiThreadState;
// nmethods (native methods) are the compiled code versions of Java methods.
//
// An nmethod contains:
// - header (the nmethod structure)
// [Relocation]
// - relocation information
// - constant part (doubles, longs and floats used in nmethod)
// - oop table
// [Code]
// - code body
// - exception handler
// - stub code
// [Debugging information]
// - oop array
// - data array
// - pcs
// [Exception handler table]
// - handler entry point array
// [Implicit Null Pointer exception table]
// - implicit null table array
// [Speculations]
// - encoded speculations array
// [JVMCINMethodData]
// - meta data for JVMCI compiled nmethod
#if INCLUDE_JVMCI
class FailedSpeculation;
class JVMCINMethodData;
#endif
class nmethod : public CompiledMethod {
friend class VMStructs;
friend class JVMCIVMStructs;
friend class NMethodSweeper;
friend class CodeCache; // scavengable oops
friend class JVMCINMethodData;
private:
// Shared fields for all nmethod's
int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
// To support simple linked-list chaining of nmethods:
nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head
// STW two-phase nmethod root processing helpers.
//
// When determining liveness of a given nmethod to do code cache unloading,
// some collectors need to to different things depending on whether the nmethods
// need to absolutely be kept alive during root processing; "strong"ly reachable
// nmethods are known to be kept alive at root processing, but the liveness of
// "weak"ly reachable ones is to be determined later.
//
// We want to allow strong and weak processing of nmethods by different threads
// at the same time without heavy synchronization. Additional constraints are
// to make sure that every nmethod is processed a minimal amount of time, and
// nmethods themselves are always iterated at most once at a particular time.
//
// Note that strong processing work must be a superset of weak processing work
// for this code to work.
//
// We store state and claim information in the _oops_do_mark_link member, using
// the two LSBs for the state and the remaining upper bits for linking together
// nmethods that were already visited.
// The last element is self-looped, i.e. points to itself to avoid some special
// "end-of-list" sentinel value.
//
// _oops_do_mark_link special values:
//
// _oops_do_mark_link == NULL: the nmethod has not been visited at all yet, i.e.
// is Unclaimed.
//
// For other values, its lowest two bits indicate the following states of the nmethod:
//
// weak_request (WR): the nmethod has been claimed by a thread for weak processing
// weak_done (WD): weak processing has been completed for this nmethod.
// strong_request (SR): the nmethod has been found to need strong processing while
// being weak processed.
// strong_done (SD): strong processing has been completed for this nmethod .
//
// The following shows the _only_ possible progressions of the _oops_do_mark_link
// pointer.
//
// Given
// N as the nmethod
// X the current next value of _oops_do_mark_link
//
// Unclaimed (C)-> N|WR (C)-> X|WD: the nmethod has been processed weakly by
// a single thread.
// Unclaimed (C)-> N|WR (C)-> X|WD (O)-> X|SD: after weak processing has been
// completed (as above) another thread found that the nmethod needs strong
// processing after all.
// Unclaimed (C)-> N|WR (O)-> N|SR (C)-> X|SD: during weak processing another
// thread finds that the nmethod needs strong processing, marks it as such and
// terminates. The original thread completes strong processing.
// Unclaimed (C)-> N|SD (C)-> X|SD: the nmethod has been processed strongly from
// the beginning by a single thread.
//
// "|" describes the concatentation of bits in _oops_do_mark_link.
//
// The diagram also describes the threads responsible for changing the nmethod to
// the next state by marking the _transition_ with (C) and (O), which mean "current"
// and "other" thread respectively.
//
struct oops_do_mark_link; // Opaque data type.
// States used for claiming nmethods during root processing.
static const uint claim_weak_request_tag = 0;
static const uint claim_weak_done_tag = 1;
static const uint claim_strong_request_tag = 2;
static const uint claim_strong_done_tag = 3;
static oops_do_mark_link* mark_link(nmethod* nm, uint tag) {
assert(tag <= claim_strong_done_tag, "invalid tag %u", tag);
assert(is_aligned(nm, 4), "nmethod pointer must have zero lower two LSB");
return (oops_do_mark_link*)(((uintptr_t)nm & ~0x3) | tag);
}
static uint extract_state(oops_do_mark_link* link) {
return (uint)((uintptr_t)link & 0x3);
}
static nmethod* extract_nmethod(oops_do_mark_link* link) {
return (nmethod*)((uintptr_t)link & ~0x3);
}
void oops_do_log_change(const char* state);
static bool oops_do_has_weak_request(oops_do_mark_link* next) {
return extract_state(next) == claim_weak_request_tag;
}
static bool oops_do_has_any_strong_state(oops_do_mark_link* next) {
return extract_state(next) >= claim_strong_request_tag;
}
// Attempt Unclaimed -> N|WR transition. Returns true if successful.
bool oops_do_try_claim_weak_request();
// Attempt Unclaimed -> N|SD transition. Returns the current link.
oops_do_mark_link* oops_do_try_claim_strong_done();
// Attempt N|WR -> X|WD transition. Returns NULL if successful, X otherwise.
nmethod* oops_do_try_add_to_list_as_weak_done();
// Attempt X|WD -> N|SR transition. Returns the current link.
oops_do_mark_link* oops_do_try_add_strong_request(oops_do_mark_link* next);
// Attempt X|WD -> X|SD transition. Returns true if successful.
bool oops_do_try_claim_weak_done_as_strong_done(oops_do_mark_link* next);
// Do the N|SD -> X|SD transition.
void oops_do_add_to_list_as_strong_done();
// Sets this nmethod as strongly claimed (as part of N|SD -> X|SD and N|SR -> X|SD
// transitions).
void oops_do_set_strong_done(nmethod* old_head);
static nmethod* volatile _oops_do_mark_nmethods;
oops_do_mark_link* volatile _oops_do_mark_link;
// offsets for entry points
address _entry_point; // entry point with class check
address _verified_entry_point; // entry point without class check
address _osr_entry_point; // entry point for on stack replacement
// Offsets for different nmethod parts
int _exception_offset;
// Offset of the unwind handler if it exists
int _unwind_handler_offset;
int _consts_offset;
int _stub_offset;
int _oops_offset; // offset to where embedded oop table begins (inside data)
int _metadata_offset; // embedded meta data table
int _scopes_data_offset;
int _scopes_pcs_offset;
int _dependencies_offset;
int _handler_table_offset;
int _nul_chk_table_offset;
#if INCLUDE_JVMCI
int _speculations_offset;
int _jvmci_data_offset;
#endif
int _nmethod_end_offset;
int code_offset() const { return (address) code_begin() - header_begin(); }
// location in frame (offset for sp) that deopt can store the original
// pc during a deopt.
int _orig_pc_offset;
int _compile_id; // which compilation made this nmethod
int _comp_level; // compilation level
// protected by CodeCache_lock
bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock)
// used by jvmti to track if an event has been posted for this nmethod.
bool _unload_reported;
bool _load_reported;
// Protected by CompiledMethod_lock
volatile signed char _state; // {not_installed, in_use, not_entrant, zombie, unloaded}
#ifdef ASSERT
bool _oops_are_stale; // indicates that it's no longer safe to access oops section
#endif
#if INCLUDE_RTM_OPT
// RTM state at compile time. Used during deoptimization to decide
// whether to restart collecting RTM locking abort statistic again.
RTMState _rtm_state;
#endif
// Nmethod Flushing lock. If non-zero, then the nmethod is not removed
// and is not made into a zombie. However, once the nmethod is made into
// a zombie, it will be locked one final time if CompiledMethodUnload
// event processing needs to be done.
volatile jint _lock_count;
// not_entrant method removal. Each mark_sweep pass will update
// this mark to current sweep invocation count if it is seen on the
// stack. An not_entrant method can be removed when there are no
// more activations, i.e., when the _stack_traversal_mark is less than
// current sweep traversal index.
volatile long _stack_traversal_mark;
// The _hotness_counter indicates the hotness of a method. The higher
// the value the hotter the method. The hotness counter of a nmethod is
// set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method
// is active while stack scanning (mark_active_nmethods()). The hotness
// counter is decreased (by 1) while sweeping.
int _hotness_counter;
// Local state used to keep track of whether unloading is happening or not
volatile uint8_t _is_unloading_state;
// These are used for compiled synchronized native methods to
// locate the owner and stack slot for the BasicLock so that we can
// properly revoke the bias of the owner if necessary. They are
// needed because there is no debug information for compiled native
// wrappers and the oop maps are insufficient to allow
// frame::retrieve_receiver() to work. Currently they are expected
// to be byte offsets from the Java stack pointer for maximum code
// sharing between platforms. Note that currently biased locking
// will never cause Class instances to be biased but this code
// handles the static synchronized case as well.
// JVMTI's GetLocalInstance() also uses these offsets to find the receiver
// for non-static native wrapper frames.
ByteSize _native_receiver_sp_offset;
ByteSize _native_basic_lock_sp_offset;
friend class nmethodLocker;
// For native wrappers
nmethod(Method* method,
CompilerType type,
int nmethod_size,
int compile_id,
CodeOffsets* offsets,
CodeBuffer *code_buffer,
int frame_size,
ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
ByteSize basic_lock_sp_offset, /* synchronized natives only */
OopMapSet* oop_maps);
// Creation support
nmethod(Method* method,
CompilerType type,
int nmethod_size,
int compile_id,
int entry_bci,
CodeOffsets* offsets,
int orig_pc_offset,
DebugInformationRecorder *recorder,
Dependencies* dependencies,
CodeBuffer *code_buffer,
int frame_size,
OopMapSet* oop_maps,
ExceptionHandlerTable* handler_table,
ImplicitExceptionTable* nul_chk_table,
AbstractCompiler* compiler,
int comp_level
#if INCLUDE_JVMCI
, char* speculations,
int speculations_len,
int jvmci_data_size
#endif
);
// helper methods
void* operator new(size_t size, int nmethod_size, int comp_level) throw();
const char* reloc_string_for(u_char* begin, u_char* end);
bool try_transition(int new_state);
// Returns true if this thread changed the state of the nmethod or
// false if another thread performed the transition.
bool make_not_entrant_or_zombie(int state);
bool make_entrant() { Unimplemented(); return false; }
void inc_decompile_count();
// Inform external interfaces that a compiled method has been unloaded
void post_compiled_method_unload();
// Initailize fields to their default values
void init_defaults();
// Offsets
int content_offset() const { return content_begin() - header_begin(); }
int data_offset() const { return _data_offset; }
address header_end() const { return (address) header_begin() + header_size(); }
public:
// create nmethod with entry_bci
static nmethod* new_nmethod(const methodHandle& method,
int compile_id,
int entry_bci,
CodeOffsets* offsets,
int orig_pc_offset,
DebugInformationRecorder* recorder,
Dependencies* dependencies,
CodeBuffer *code_buffer,
int frame_size,
OopMapSet* oop_maps,
ExceptionHandlerTable* handler_table,
ImplicitExceptionTable* nul_chk_table,
AbstractCompiler* compiler,
int comp_level
#if INCLUDE_JVMCI
, char* speculations = NULL,
int speculations_len = 0,
int nmethod_mirror_index = -1,
const char* nmethod_mirror_name = NULL,
FailedSpeculation** failed_speculations = NULL
#endif
);
// Only used for unit tests.
nmethod()
: CompiledMethod(),
_is_unloading_state(0),
_native_receiver_sp_offset(in_ByteSize(-1)),
_native_basic_lock_sp_offset(in_ByteSize(-1)) {}
static nmethod* new_native_nmethod(const methodHandle& method,
int compile_id,
CodeBuffer *code_buffer,
int vep_offset,
int frame_complete,
int frame_size,
ByteSize receiver_sp_offset,
ByteSize basic_lock_sp_offset,
OopMapSet* oop_maps);
// type info
bool is_nmethod() const { return true; }
bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
// boundaries for different parts
address consts_begin () const { return header_begin() + _consts_offset ; }
address consts_end () const { return code_begin() ; }
address stub_begin () const { return header_begin() + _stub_offset ; }
address stub_end () const { return header_begin() + _oops_offset ; }
address exception_begin () const { return header_begin() + _exception_offset ; }
address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; }
Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; }
Metadata** metadata_end () const { return (Metadata**) _scopes_data_begin; }
address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
address dependencies_end () const { return header_begin() + _handler_table_offset ; }
address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
#if INCLUDE_JVMCI
address nul_chk_table_end () const { return header_begin() + _speculations_offset ; }
address speculations_begin () const { return header_begin() + _speculations_offset ; }
address speculations_end () const { return header_begin() + _jvmci_data_offset ; }
address jvmci_data_begin () const { return header_begin() + _jvmci_data_offset ; }
address jvmci_data_end () const { return header_begin() + _nmethod_end_offset ; }
#else
address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
#endif
// Sizes
int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); }
int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
#if INCLUDE_JVMCI
int speculations_size () const { return speculations_end () - speculations_begin (); }
int jvmci_data_size () const { return jvmci_data_end () - jvmci_data_begin (); }
#endif
int oops_count() const { assert(oops_size() % oopSize == 0, ""); return (oops_size() / oopSize) + 1; }
int metadata_count() const { assert(metadata_size() % wordSize == 0, ""); return (metadata_size() / wordSize) + 1; }
int total_size () const;
void dec_hotness_counter() { _hotness_counter--; }
void set_hotness_counter(int val) { _hotness_counter = val; }
int hotness_counter() const { return _hotness_counter; }
// Containment
bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); }
bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
// entry points
address entry_point() const { return _entry_point; } // normal entry point
address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
// flag accessing and manipulation
bool is_not_installed() const { return _state == not_installed; }
bool is_in_use() const { return _state <= in_use; }
bool is_alive() const { return _state < unloaded; }
bool is_not_entrant() const { return _state == not_entrant; }
bool is_zombie() const { return _state == zombie; }
bool is_unloaded() const { return _state == unloaded; }
void clear_unloading_state();
virtual bool is_unloading();
virtual void do_unloading(bool unloading_occurred);
#if INCLUDE_RTM_OPT
// rtm state accessing and manipulating
RTMState rtm_state() const { return _rtm_state; }
void set_rtm_state(RTMState state) { _rtm_state = state; }
#endif
bool make_in_use() {
return try_transition(in_use);
}
// Make the nmethod non entrant. The nmethod will continue to be
// alive. It is used when an uncommon trap happens. Returns true
// if this thread changed the state of the nmethod or false if
// another thread performed the transition.
bool make_not_entrant() {
assert(!method()->is_method_handle_intrinsic(), "Cannot make MH intrinsic not entrant");
return make_not_entrant_or_zombie(not_entrant);
}
bool make_not_used() { return make_not_entrant(); }
bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
int get_state() const {
return _state;
}
void make_unloaded();
bool has_dependencies() { return dependencies_size() != 0; }
void print_dependencies() PRODUCT_RETURN;
void flush_dependencies(bool delete_immediately);
bool has_flushed_dependencies() { return _has_flushed_dependencies; }
void set_has_flushed_dependencies() {
assert(!has_flushed_dependencies(), "should only happen once");
_has_flushed_dependencies = 1;
}
int comp_level() const { return _comp_level; }
void unlink_from_method();
// Support for oops in scopes and relocs:
// Note: index 0 is reserved for null.
oop oop_at(int index) const;
oop oop_at_phantom(int index) const; // phantom reference
oop* oop_addr_at(int index) const { // for GC
// relocation indexes are biased by 1 (because 0 is reserved)
assert(index > 0 && index <= oops_count(), "must be a valid non-zero index");
assert(!_oops_are_stale, "oops are stale");
return &oops_begin()[index - 1];
}
// Support for meta data in scopes and relocs:
// Note: index 0 is reserved for null.
Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); }
Metadata** metadata_addr_at(int index) const { // for GC
// relocation indexes are biased by 1 (because 0 is reserved)
assert(index > 0 && index <= metadata_count(), "must be a valid non-zero index");
return &metadata_begin()[index - 1];
}
void copy_values(GrowableArray<jobject>* oops);
void copy_values(GrowableArray<Metadata*>* metadata);
// Relocation support
private:
void fix_oop_relocations(address begin, address end, bool initialize_immediates);
inline void initialize_immediate_oop(oop* dest, jobject handle);
public:
void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
// Sweeper support
long stack_traversal_mark() { return _stack_traversal_mark; }
void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
// On-stack replacement support
int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; }
address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; }
void invalidate_osr_method();
nmethod* osr_link() const { return _osr_link; }
void set_osr_link(nmethod *n) { _osr_link = n; }
// Verify calls to dead methods have been cleaned.
void verify_clean_inline_caches();
// unlink and deallocate this nmethod
// Only NMethodSweeper class is expected to use this. NMethodSweeper is not
// expected to use any other private methods/data in this class.
protected:
void flush();
public:
// When true is returned, it is unsafe to remove this nmethod even if
// it is a zombie, since the VM or the ServiceThread might still be
// using it.
bool is_locked_by_vm() const { return _lock_count >0; }
// See comment at definition of _last_seen_on_stack
void mark_as_seen_on_stack();
bool can_convert_to_zombie();
// Evolution support. We make old (discarded) compiled methods point to new Method*s.
void set_method(Method* method) { _method = method; }
#if INCLUDE_JVMCI
// Gets the JVMCI name of this nmethod.
const char* jvmci_name();
// Records the pending failed speculation in the
// JVMCI speculation log associated with this nmethod.
void update_speculation(JavaThread* thread);
// Gets the data specific to a JVMCI compiled method.
// This returns a non-NULL value iff this nmethod was
// compiled by the JVMCI compiler.
JVMCINMethodData* jvmci_nmethod_data() const {
return jvmci_data_size() == 0 ? NULL : (JVMCINMethodData*) jvmci_data_begin();
}
#endif
public:
void oops_do(OopClosure* f) { oops_do(f, false); }
void oops_do(OopClosure* f, bool allow_dead);
// All-in-one claiming of nmethods: returns true if the caller successfully claimed that
// nmethod.
bool oops_do_try_claim();
// Class containing callbacks for the oops_do_process_weak/strong() methods
// below.
class OopsDoProcessor {
public:
// Process the oops of the given nmethod based on whether it has been called
// in a weak or strong processing context, i.e. apply either weak or strong
// work on it.
virtual void do_regular_processing(nmethod* nm) = 0;
// Assuming that the oops of the given nmethod has already been its weak
// processing applied, apply the remaining strong processing part.
virtual void do_remaining_strong_processing(nmethod* nm) = 0;
};
// The following two methods do the work corresponding to weak/strong nmethod
// processing.
void oops_do_process_weak(OopsDoProcessor* p);
void oops_do_process_strong(OopsDoProcessor* p);
static void oops_do_marking_prologue();
static void oops_do_marking_epilogue();
private:
ScopeDesc* scope_desc_in(address begin, address end);
address* orig_pc_addr(const frame* fr);
// used by jvmti to track if the load and unload events has been reported
bool unload_reported() const { return _unload_reported; }
void set_unload_reported() { _unload_reported = true; }
bool load_reported() const { return _load_reported; }
void set_load_reported() { _load_reported = true; }
public:
// copying of debugging information
void copy_scopes_pcs(PcDesc* pcs, int count);
void copy_scopes_data(address buffer, int size);
// Accessor/mutator for the original pc of a frame before a frame was deopted.
address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
// jvmti support:
void post_compiled_method_load_event(JvmtiThreadState* state = NULL);
// verify operations
void verify();
void verify_scopes();
void verify_interrupt_point(address interrupt_point);
// Disassemble this nmethod with additional debug information, e.g. information about blocks.
void decode2(outputStream* st) const;
void print_constant_pool(outputStream* st);
// Avoid hiding of parent's 'decode(outputStream*)' method.
void decode(outputStream* st) const { decode2(st); } // just delegate here.
// printing support
void print() const;
void print(outputStream* st) const;
void print_code();
#if defined(SUPPORT_DATA_STRUCTS)
// print output in opt build for disassembler library
void print_relocations() PRODUCT_RETURN;
void print_pcs() { print_pcs_on(tty); }
void print_pcs_on(outputStream* st);
void print_scopes() { print_scopes_on(tty); }
void print_scopes_on(outputStream* st) PRODUCT_RETURN;
void print_value_on(outputStream* st) const;
void print_handler_table();
void print_nul_chk_table();
void print_recorded_oops();
void print_recorded_metadata();
void print_oops(outputStream* st); // oops from the underlying CodeBlob.
void print_metadata(outputStream* st); // metadata in metadata pool.
#else
// void print_pcs() PRODUCT_RETURN;
void print_pcs() { return; }
#endif
void print_calls(outputStream* st) PRODUCT_RETURN;
static void print_statistics() PRODUCT_RETURN;
void maybe_print_nmethod(DirectiveSet* directive);
void print_nmethod(bool print_code);
// need to re-define this from CodeBlob else the overload hides it
virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
void print_on(outputStream* st, const char* msg) const;
// Logging
void log_identity(xmlStream* log) const;
void log_new_nmethod() const;
void log_state_change() const;
// Prints block-level comments, including nmethod specific block labels:
virtual void print_block_comment(outputStream* stream, address block_begin) const {
#if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
print_nmethod_labels(stream, block_begin);
CodeBlob::print_block_comment(stream, block_begin);
#endif
}
bool has_block_comment(address block_begin) {
return CodeBlob::has_block_comment(block_begin);
}
void print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels=true) const;
const char* nmethod_section_label(address pos) const;
// returns whether this nmethod has code comments.
bool has_code_comment(address begin, address end);
// Prints a comment for one native instruction (reloc info, pc desc)
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