jdk8-mips64-public/hotspot: src/share/vm/asm/codeBuffer.hpp@0878d7bae69f (annotated)

src/share/vm/asm/codeBuffer.hpp@0878d7bae69f (annotated)

src/share/vm/asm/codeBuffer.hpp

Fri, 27 Aug 2010 01:51:27 -0700

author: twisti
date: Fri, 27 Aug 2010 01:51:27 -0700
changeset 2117: 0878d7bae69f
parent 2103: 3e8fbc61cee8
child 2201: d55217dc206f
permissions: -rw-r--r--

6961697: move nmethod constants section before instruction section
Summary: This is a preparation for 6961690.
Reviewed-by: kvn, never

 /*
  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 class  CodeComments;
 class  AbstractAssembler;
 class  MacroAssembler;
 class  PhaseCFG;
 class  Compile;
 class  BufferBlob;
 class  CodeBuffer;
 class CodeOffsets: public StackObj {
 public:
   enum Entries { Entry,
                  Verified_Entry,
                  Frame_Complete, // Offset in the code where the frame setup is (for forte stackwalks) is complete
                  OSR_Entry,
                  Dtrace_trap = OSR_Entry,  // dtrace probes can never have an OSR entry so reuse it
                  Exceptions,     // Offset where exception handler lives
                  Deopt,          // Offset where deopt handler lives
                  DeoptMH,        // Offset where MethodHandle deopt handler lives
                  UnwindHandler,  // Offset to default unwind handler
                  max_Entries };
   // special value to note codeBlobs where profile (forte) stack walking is
   // always dangerous and suspect.
   enum { frame_never_safe = -1 };
 private:
   int _values[max_Entries];
 public:
   CodeOffsets() {
     _values[Entry         ] = 0;
     _values[Verified_Entry] = 0;
     _values[Frame_Complete] = frame_never_safe;
     _values[OSR_Entry     ] = 0;
     _values[Exceptions    ] = -1;
     _values[Deopt         ] = -1;
     _values[DeoptMH       ] = -1;
     _values[UnwindHandler ] = -1;
   }
   int value(Entries e) { return _values[e]; }
   void set_value(Entries e, int val) { _values[e] = val; }
 };
 // This class represents a stream of code and associated relocations.
 // There are a few in each CodeBuffer.
 // They are filled concurrently, and concatenated at the end.
 class CodeSection VALUE_OBJ_CLASS_SPEC {
   friend class CodeBuffer;
  public:
   typedef int csize_t;  // code size type; would be size_t except for history
  private:
   address     _start;           // first byte of contents (instructions)
   address     _mark;            // user mark, usually an instruction beginning
   address     _end;             // current end address
   address     _limit;           // last possible (allocated) end address
   relocInfo*  _locs_start;      // first byte of relocation information
   relocInfo*  _locs_end;        // first byte after relocation information
   relocInfo*  _locs_limit;      // first byte after relocation information buf
   address     _locs_point;      // last relocated position (grows upward)
   bool        _locs_own;        // did I allocate the locs myself?
   bool        _frozen;          // no more expansion of this section
   char        _index;           // my section number (SECT_INST, etc.)
   CodeBuffer* _outer;           // enclosing CodeBuffer
   // (Note:  _locs_point used to be called _last_reloc_offset.)
   CodeSection() {
     _start         = NULL;
     _mark          = NULL;
     _end           = NULL;
     _limit         = NULL;
     _locs_start    = NULL;
     _locs_end      = NULL;
     _locs_limit    = NULL;
     _locs_point    = NULL;
     _locs_own      = false;
     _frozen        = false;
     debug_only(_index = (char)-1);
     debug_only(_outer = (CodeBuffer*)badAddress);
   }
   void initialize_outer(CodeBuffer* outer, int index) {
     _outer = outer;
     _index = index;
   }
   void initialize(address start, csize_t size = 0) {
     assert(_start == NULL, "only one init step, please");
     _start         = start;
     _mark          = NULL;
     _end           = start;
     _limit         = start + size;
     _locs_point    = start;
   }
   void initialize_locs(int locs_capacity);
   void expand_locs(int new_capacity);
   void initialize_locs_from(const CodeSection* source_cs);
   // helper for CodeBuffer::expand()
   void take_over_code_from(CodeSection* cs) {
     _start      = cs->_start;
     _mark       = cs->_mark;
     _end        = cs->_end;
     _limit      = cs->_limit;
     _locs_point = cs->_locs_point;
   }
  public:
   address     start() const         { return _start; }
   address     mark() const          { return _mark; }
   address     end() const           { return _end; }
   address     limit() const         { return _limit; }
   csize_t     size() const          { return (csize_t)(_end - _start); }
   csize_t     mark_off() const      { assert(_mark != NULL, "not an offset");
                                       return (csize_t)(_mark - _start); }
   csize_t     capacity() const      { return (csize_t)(_limit - _start); }
   csize_t     remaining() const     { return (csize_t)(_limit - _end); }
   relocInfo*  locs_start() const    { return _locs_start; }
   relocInfo*  locs_end() const      { return _locs_end; }
   int         locs_count() const    { return (int)(_locs_end - _locs_start); }
   relocInfo*  locs_limit() const    { return _locs_limit; }
   address     locs_point() const    { return _locs_point; }
   csize_t     locs_point_off() const{ return (csize_t)(_locs_point - _start); }
   csize_t     locs_capacity() const { return (csize_t)(_locs_limit - _locs_start); }
   csize_t     locs_remaining()const { return (csize_t)(_locs_limit - _locs_end); }
   int         index() const         { return _index; }
   bool        is_allocated() const  { return _start != NULL; }
   bool        is_empty() const      { return _start == _end; }
   bool        is_frozen() const     { return _frozen; }
   bool        has_locs() const      { return _locs_end != NULL; }
   CodeBuffer* outer() const         { return _outer; }
   // is a given address in this section?  (2nd version is end-inclusive)
   bool contains(address pc) const   { return pc >= _start && pc <  _end; }
   bool contains2(address pc) const  { return pc >= _start && pc <= _end; }
   bool allocates(address pc) const  { return pc >= _start && pc <  _limit; }
   bool allocates2(address pc) const { return pc >= _start && pc <= _limit; }
   void    set_end(address pc)       { assert(allocates2(pc),""); _end = pc; }
   void    set_mark(address pc)      { assert(contains2(pc),"not in codeBuffer");
                                       _mark = pc; }
   void    set_mark_off(int offset)  { assert(contains2(offset+_start),"not in codeBuffer");
                                       _mark = offset + _start; }
   void    set_mark()                { _mark = _end; }
   void    clear_mark()              { _mark = NULL; }
   void    set_locs_end(relocInfo* p) {
     assert(p <= locs_limit(), "locs data fits in allocated buffer");
     _locs_end = p;
   }
   void    set_locs_point(address pc) {
     assert(pc >= locs_point(), "relocation addr may not decrease");
     assert(allocates2(pc),     "relocation addr must be in this section");
     _locs_point = pc;
   }
   // Code emission
   void emit_int8 (int8_t  x) { *((int8_t*)  end()) = x; set_end(end() + 1); }
   void emit_int16(int16_t x) { *((int16_t*) end()) = x; set_end(end() + 2); }
   void emit_int32(int32_t x) { *((int32_t*) end()) = x; set_end(end() + 4); }
   void emit_int64(int64_t x) { *((int64_t*) end()) = x; set_end(end() + 8); }
   // Share a scratch buffer for relocinfo.  (Hacky; saves a resource allocation.)
   void initialize_shared_locs(relocInfo* buf, int length);
   // Manage labels and their addresses.
   address target(Label& L, address branch_pc);
   // Emit a relocation.
   void relocate(address at, RelocationHolder const& rspec, int format = 0);
   void relocate(address at,    relocInfo::relocType rtype, int format = 0) {
     if (rtype != relocInfo::none)
       relocate(at, Relocation::spec_simple(rtype), format);
   }
   // alignment requirement for starting offset
   // Requirements are that the instruction area and the
   // stubs area must start on CodeEntryAlignment, and
   // the ctable on sizeof(jdouble)
   int alignment() const             { return MAX2((int)sizeof(jdouble), (int)CodeEntryAlignment); }
   // Slop between sections, used only when allocating temporary BufferBlob buffers.
   static csize_t end_slop()         { return MAX2((int)sizeof(jdouble), (int)CodeEntryAlignment); }
   csize_t align_at_start(csize_t off) const { return (csize_t) align_size_up(off, alignment()); }
   // Mark a section frozen.  Assign its remaining space to
   // the following section.  It will never expand after this point.
   inline void freeze();         //  { _outer->freeze_section(this); }
   // Ensure there's enough space left in the current section.
   // Return true if there was an expansion.
   bool maybe_expand_to_ensure_remaining(csize_t amount);
 #ifndef PRODUCT
   void decode();
   void dump();
   void print(const char* name);
 #endif //PRODUCT
 };
 class CodeComment;
 class CodeComments VALUE_OBJ_CLASS_SPEC {
 private:
 #ifndef PRODUCT
   CodeComment* _comments;
 #endif
 public:
   CodeComments() {
 #ifndef PRODUCT
     _comments = NULL;
 #endif
   }
   void add_comment(intptr_t offset, const char * comment) PRODUCT_RETURN;
   void print_block_comment(outputStream* stream, intptr_t offset)  PRODUCT_RETURN;
   void assign(CodeComments& other)  PRODUCT_RETURN;
   void free() PRODUCT_RETURN;
 };
 // A CodeBuffer describes a memory space into which assembly
 // code is generated.  This memory space usually occupies the
 // interior of a single BufferBlob, but in some cases it may be
 // an arbitrary span of memory, even outside the code cache.
 //
 // A code buffer comes in two variants:
 //
 // (1) A CodeBuffer referring to an already allocated piece of memory:
 //     This is used to direct 'static' code generation (e.g. for interpreter
 //     or stubroutine generation, etc.).  This code comes with NO relocation
 //     information.
 //
 // (2) A CodeBuffer referring to a piece of memory allocated when the
 //     CodeBuffer is allocated.  This is used for nmethod generation.
 //
 // The memory can be divided up into several parts called sections.
 // Each section independently accumulates code (or data) an relocations.
 // Sections can grow (at the expense of a reallocation of the BufferBlob
 // and recopying of all active sections).  When the buffered code is finally
 // written to an nmethod (or other CodeBlob), the contents (code, data,
 // and relocations) of the sections are padded to an alignment and concatenated.
 // Instructions and data in one section can contain relocatable references to
 // addresses in a sibling section.
 class CodeBuffer: public StackObj {
   friend class CodeSection;
  private:
   // CodeBuffers must be allocated on the stack except for a single
   // special case during expansion which is handled internally.  This
   // is done to guarantee proper cleanup of resources.
   void* operator new(size_t size) { return ResourceObj::operator new(size); }
   void  operator delete(void* p)  { ShouldNotCallThis(); }
  public:
   typedef int csize_t;  // code size type; would be size_t except for history
   enum {
     // Here is the list of all possible sections.  The order reflects
     // the final layout.
     SECT_FIRST = 0,
     SECT_CONSTS = SECT_FIRST, // Non-instruction data:  Floats, jump tables, etc.
     SECT_INSTS,               // Executable instructions.
     SECT_STUBS,               // Outbound trampolines for supporting call sites.
     SECT_LIMIT, SECT_NONE = -1
   };
  private:
   enum {
     sect_bits = 2,      // assert (SECT_LIMIT <= (1<<sect_bits))
     sect_mask = (1<<sect_bits)-1
   };
   const char*  _name;
   CodeSection  _consts;             // constants, jump tables
   CodeSection  _insts;              // instructions (the main section)
   CodeSection  _stubs;              // stubs (call site support), deopt, exception handling
   CodeBuffer*  _before_expand;  // dead buffer, from before the last expansion
   BufferBlob*  _blob;           // optional buffer in CodeCache for generated code
   address      _total_start;    // first address of combined memory buffer
   csize_t      _total_size;     // size in bytes of combined memory buffer
   OopRecorder* _oop_recorder;
   CodeComments _comments;
   OopRecorder  _default_oop_recorder;  // override with initialize_oop_recorder
   Arena*       _overflow_arena;
   address      _decode_begin;   // start address for decode
   address      decode_begin();
   void initialize_misc(const char * name) {
     // all pointers other than code_start/end and those inside the sections
     assert(name != NULL, "must have a name");
     _name            = name;
     _before_expand   = NULL;
     _blob            = NULL;
     _oop_recorder    = NULL;
     _decode_begin    = NULL;
     _overflow_arena  = NULL;
   }
   void initialize(address code_start, csize_t code_size) {
     _consts.initialize_outer(this,  SECT_CONSTS);
     _insts.initialize_outer(this,   SECT_INSTS);
     _stubs.initialize_outer(this,   SECT_STUBS);
     _total_start = code_start;
     _total_size  = code_size;
     // Initialize the main section:
     _insts.initialize(code_start, code_size);
     assert(!_stubs.is_allocated(),  "no garbage here");
     assert(!_consts.is_allocated(), "no garbage here");
     _oop_recorder = &_default_oop_recorder;
   }
   void initialize_section_size(CodeSection* cs, csize_t size);
   void freeze_section(CodeSection* cs);
   // helper for CodeBuffer::expand()
   void take_over_code_from(CodeBuffer* cs);
 #ifdef ASSERT
   // ensure sections are disjoint, ordered, and contained in the blob
   bool verify_section_allocation();
 #endif
   // copies combined relocations to the blob, returns bytes copied
   // (if target is null, it is a dry run only, just for sizing)
   csize_t copy_relocations_to(CodeBlob* blob) const;
   // copies combined code to the blob (assumes relocs are already in there)
   void copy_code_to(CodeBlob* blob);
   // moves code sections to new buffer (assumes relocs are already in there)
   void relocate_code_to(CodeBuffer* cb) const;
   // set up a model of the final layout of my contents
   void compute_final_layout(CodeBuffer* dest) const;
   // Expand the given section so at least 'amount' is remaining.
   // Creates a new, larger BufferBlob, and rewrites the code & relocs.
   void expand(CodeSection* which_cs, csize_t amount);
   // Helper for expand.
   csize_t figure_expanded_capacities(CodeSection* which_cs, csize_t amount, csize_t* new_capacity);
  public:
   // (1) code buffer referring to pre-allocated instruction memory
   CodeBuffer(address code_start, csize_t code_size) {
     assert(code_start != NULL, "sanity");
     initialize_misc("static buffer");
     initialize(code_start, code_size);
     assert(verify_section_allocation(), "initial use of buffer OK");
   }
   // (2) CodeBuffer referring to pre-allocated CodeBlob.
   CodeBuffer(CodeBlob* blob);
   // (3) code buffer allocating codeBlob memory for code & relocation
   // info but with lazy initialization.  The name must be something
   // informative.
   CodeBuffer(const char* name) {
     initialize_misc(name);
   }
   // (4) code buffer allocating codeBlob memory for code & relocation
   // info.  The name must be something informative and code_size must
   // include both code and stubs sizes.
   CodeBuffer(const char* name, csize_t code_size, csize_t locs_size) {
     initialize_misc(name);
     initialize(code_size, locs_size);
   }
   ~CodeBuffer();
   // Initialize a CodeBuffer constructed using constructor 3.  Using
   // constructor 4 is equivalent to calling constructor 3 and then
   // calling this method.  It's been factored out for convenience of
   // construction.
   void initialize(csize_t code_size, csize_t locs_size);
   CodeSection* consts()            { return &_consts; }
   CodeSection* insts()             { return &_insts; }
   CodeSection* stubs()             { return &_stubs; }
   // present sections in order; return NULL at end; consts is #0, etc.
   CodeSection* code_section(int n) {
     // This makes the slightly questionable but portable assumption
     // that the various members (_consts, _insts, _stubs, etc.) are
     // adjacent in the layout of CodeBuffer.
     CodeSection* cs = &_consts + n;
     assert(cs->index() == n || !cs->is_allocated(), "sanity");
     return cs;
   }
   const CodeSection* code_section(int n) const {  // yucky const stuff
     return ((CodeBuffer*)this)->code_section(n);
   }
   static const char* code_section_name(int n);
   int section_index_of(address addr) const;
   bool contains(address addr) const {
     // handy for debugging
     return section_index_of(addr) > SECT_NONE;
   }
   // A stable mapping between 'locators' (small ints) and addresses.
   static int locator_pos(int locator)   { return locator >> sect_bits; }
   static int locator_sect(int locator)  { return locator &  sect_mask; }
   static int locator(int pos, int sect) { return (pos << sect_bits) | sect; }
   int        locator(address addr) const;
   address    locator_address(int locator) const;
   // Properties
   const char* name() const                  { return _name; }
   CodeBuffer* before_expand() const         { return _before_expand; }
   BufferBlob* blob() const                  { return _blob; }
   void    set_blob(BufferBlob* blob);
   void   free_blob();                       // Free the blob, if we own one.
   // Properties relative to the insts section:
   address       insts_begin() const      { return _insts.start();      }
   address       insts_end() const        { return _insts.end();        }
   void      set_insts_end(address end)   {        _insts.set_end(end); }
   address       insts_limit() const      { return _insts.limit();      }
   address       insts_mark() const       { return _insts.mark();       }
   void      set_insts_mark()             {        _insts.set_mark();   }
   void    clear_insts_mark()             {        _insts.clear_mark(); }
   // is there anything in the buffer other than the current section?
   bool    is_pure() const                { return insts_size() == total_content_size(); }
   // size in bytes of output so far in the insts sections
   csize_t insts_size() const             { return _insts.size(); }
   // same as insts_size(), except that it asserts there is no non-code here
   csize_t pure_insts_size() const        { assert(is_pure(), "no non-code");
                                            return insts_size(); }
   // capacity in bytes of the insts sections
   csize_t insts_capacity() const         { return _insts.capacity(); }
   // number of bytes remaining in the insts section
   csize_t insts_remaining() const        { return _insts.remaining(); }
   // is a given address in the insts section?  (2nd version is end-inclusive)
   bool insts_contains(address pc) const  { return _insts.contains(pc); }
   bool insts_contains2(address pc) const { return _insts.contains2(pc); }
   // Allocated size in all sections, when aligned and concatenated
   // (this is the eventual state of the content in its final
   // CodeBlob).
   csize_t total_content_size() const;
   // Combined offset (relative to start of first section) of given
   // section, as eventually found in the final CodeBlob.
   csize_t total_offset_of(CodeSection* cs) const;
   // allocated size of all relocation data, including index, rounded up
   csize_t total_relocation_size() const;
   // allocated size of any and all recorded oops
   csize_t total_oop_size() const {
     OopRecorder* recorder = oop_recorder();
     return (recorder == NULL)? 0: recorder->oop_size();
   }
   // Configuration functions, called immediately after the CB is constructed.
   // The section sizes are subtracted from the original insts section.
   // Note:  Call them in reverse section order, because each steals from insts.
   void initialize_consts_size(csize_t size)            { initialize_section_size(&_consts,  size); }
   void initialize_stubs_size(csize_t size)             { initialize_section_size(&_stubs,   size); }
   // Override default oop recorder.
   void initialize_oop_recorder(OopRecorder* r);
   OopRecorder* oop_recorder() const   { return _oop_recorder; }
   CodeComments& comments()            { return _comments; }
   // Code generation
   void relocate(address at, RelocationHolder const& rspec, int format = 0) {
     _insts.relocate(at, rspec, format);
   }
   void relocate(address at,    relocInfo::relocType rtype, int format = 0) {
     _insts.relocate(at, rtype, format);
   }
   // Management of overflow storage for binding of Labels.
   GrowableArray<int>* create_patch_overflow();
   // NMethod generation
   void copy_code_and_locs_to(CodeBlob* blob) {
     assert(blob != NULL, "sane");
     copy_relocations_to(blob);
     copy_code_to(blob);
   }
   void copy_oops_to(nmethod* nm) {
     if (!oop_recorder()->is_unused()) {
       oop_recorder()->copy_to(nm);
     }
   }
   // Transform an address from the code in this code buffer to a specified code buffer
   address transform_address(const CodeBuffer &cb, address addr) const;
   void block_comment(intptr_t offset, const char * comment) PRODUCT_RETURN;
 #ifndef PRODUCT
  public:
   // Printing / Decoding
   // decodes from decode_begin() to code_end() and sets decode_begin to end
   void    decode();
   void    decode_all();         // decodes all the code
   void    skip_decode();        // sets decode_begin to code_end();
   void    print();
 #endif
   // The following header contains architecture-specific implementations
   #include "incls/_codeBuffer_pd.hpp.incl"
 };
 inline void CodeSection::freeze() {
   _outer->freeze_section(this);
 }
 inline bool CodeSection::maybe_expand_to_ensure_remaining(csize_t amount) {
   if (remaining() < amount) { _outer->expand(this, amount); return true; }
   return false;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/asm/codeBuffer.hpp@0878d7bae69f (annotated)

src/share/vm/asm/codeBuffer.hpp