72 CodeOffsets() {
73 _values[Entry ] = 0;
74 _values[Verified_Entry] = 0;
75 _values[Frame_Complete] = frame_never_safe;
76 _values[OSR_Entry ] = 0;
77 _values[Exceptions ] = -1;
78 _values[Deopt ] = -1;
79 _values[DeoptMH ] = -1;
80 _values[UnwindHandler ] = -1;
81 }
82
83 int value(Entries e) { return _values[e]; }
84 void set_value(Entries e, int val) { _values[e] = val; }
85 };
86
87 // This class represents a stream of code and associated relocations.
88 // There are a few in each CodeBuffer.
89 // They are filled concurrently, and concatenated at the end.
90 class CodeSection {
91 friend class CodeBuffer;
92 public:
93 typedef int csize_t; // code size type; would be size_t except for history
94
95 private:
96 address _start; // first byte of contents (instructions)
97 address _mark; // user mark, usually an instruction beginning
98 address _end; // current end address
99 address _limit; // last possible (allocated) end address
100 relocInfo* _locs_start; // first byte of relocation information
101 relocInfo* _locs_end; // first byte after relocation information
102 relocInfo* _locs_limit; // first byte after relocation information buf
103 address _locs_point; // last relocated position (grows upward)
104 bool _locs_own; // did I allocate the locs myself?
105 bool _scratch_emit; // Buffer is used for scratch emit, don't relocate.
106 int _skipped_instructions_size;
107 int8_t _index; // my section number (SECT_INST, etc.)
108 CodeBuffer* _outer; // enclosing CodeBuffer
109
110 // (Note: _locs_point used to be called _last_reloc_offset.)
111
266
267 // Emit a relocation.
268 void relocate(address at, RelocationHolder const& rspec, int format = 0);
269 void relocate(address at, relocInfo::relocType rtype, int format = 0, jint method_index = 0);
270
271 int alignment() const;
272
273 // Slop between sections, used only when allocating temporary BufferBlob buffers.
274 static csize_t end_slop() { return MAX2((int)sizeof(jdouble), (int)CodeEntryAlignment); }
275
276 csize_t align_at_start(csize_t off) const {
277 return (csize_t) align_up(off, alignment());
278 }
279
280 // Ensure there's enough space left in the current section.
281 // Return true if there was an expansion.
282 bool maybe_expand_to_ensure_remaining(csize_t amount);
283
284 #ifndef PRODUCT
285 void decode();
286 void print(const char* name);
287 #endif //PRODUCT
288 };
289
290
291 #ifndef PRODUCT
292
293 class AsmRemarkCollection;
294 class DbgStringCollection;
295
296 // The assumption made here is that most code remarks (or comments) added to
297 // the generated assembly code are unique, i.e. there is very little gain in
298 // trying to share the strings between the different offsets tracked in a
299 // buffer (or blob).
300
301 class AsmRemarks {
302 public:
303 AsmRemarks();
304 ~AsmRemarks();
305
306 const char* insert(uint offset, const char* remstr);
369 // (1) A CodeBuffer referring to an already allocated piece of memory:
370 // This is used to direct 'static' code generation (e.g. for interpreter
371 // or stubroutine generation, etc.). This code comes with NO relocation
372 // information.
373 //
374 // (2) A CodeBuffer referring to a piece of memory allocated when the
375 // CodeBuffer is allocated. This is used for nmethod generation.
376 //
377 // The memory can be divided up into several parts called sections.
378 // Each section independently accumulates code (or data) an relocations.
379 // Sections can grow (at the expense of a reallocation of the BufferBlob
380 // and recopying of all active sections). When the buffered code is finally
381 // written to an nmethod (or other CodeBlob), the contents (code, data,
382 // and relocations) of the sections are padded to an alignment and concatenated.
383 // Instructions and data in one section can contain relocatable references to
384 // addresses in a sibling section.
385
386 class CodeBuffer: public StackObj DEBUG_ONLY(COMMA private Scrubber) {
387 friend class CodeSection;
388 friend class StubCodeGenerator;
389
390 private:
391 // CodeBuffers must be allocated on the stack except for a single
392 // special case during expansion which is handled internally. This
393 // is done to guarantee proper cleanup of resources.
394 void* operator new(size_t size) throw() { return resource_allocate_bytes(size); }
395 void operator delete(void* p) { ShouldNotCallThis(); }
396
397 public:
398 typedef int csize_t; // code size type; would be size_t except for history
399 enum : int8_t {
400 // Here is the list of all possible sections. The order reflects
401 // the final layout.
402 SECT_FIRST = 0,
403 SECT_CONSTS = SECT_FIRST, // Non-instruction data: Floats, jump tables, etc.
404 SECT_INSTS, // Executable instructions.
405 SECT_STUBS, // Outbound trampolines for supporting call sites.
406 SECT_LIMIT, SECT_NONE = -1
407 };
408
723 const char* code_string(const char* str) PRODUCT_RETURN_(return nullptr;);
724
725 // Log a little info about section usage in the CodeBuffer
726 void log_section_sizes(const char* name);
727
728 // Make a set of stubs final. It can create/optimize stubs.
729 bool finalize_stubs();
730
731 // Request for a shared stub to the interpreter
732 void shared_stub_to_interp_for(ciMethod* callee, csize_t call_offset);
733
734 void set_const_section_alignment(int align) {
735 _const_section_alignment = align_up(align, HeapWordSize);
736 }
737
738 #ifndef PRODUCT
739 public:
740 // Printing / Decoding
741 // decodes from decode_begin() to code_end() and sets decode_begin to end
742 void decode();
743 void print();
744 #endif
745 // Directly disassemble code buffer.
746 void decode(address start, address end);
747
748 // The following header contains architecture-specific implementations
749 #include CPU_HEADER(codeBuffer)
750
751 };
752
753 // A Java method can have calls of Java methods which can be statically bound.
754 // Calls of Java methods need stubs to the interpreter. Calls sharing the same Java method
755 // can share a stub to the interpreter.
756 // A SharedStubToInterpRequest is a request for a shared stub to the interpreter.
757 class SharedStubToInterpRequest : public ResourceObj {
758 private:
759 ciMethod* _shared_method;
760 CodeBuffer::csize_t _call_offset; // The offset of the call in CodeBuffer
761
762 public:
763 SharedStubToInterpRequest(ciMethod* method = nullptr, CodeBuffer::csize_t call_offset = -1) : _shared_method(method),
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72 CodeOffsets() {
73 _values[Entry ] = 0;
74 _values[Verified_Entry] = 0;
75 _values[Frame_Complete] = frame_never_safe;
76 _values[OSR_Entry ] = 0;
77 _values[Exceptions ] = -1;
78 _values[Deopt ] = -1;
79 _values[DeoptMH ] = -1;
80 _values[UnwindHandler ] = -1;
81 }
82
83 int value(Entries e) { return _values[e]; }
84 void set_value(Entries e, int val) { _values[e] = val; }
85 };
86
87 // This class represents a stream of code and associated relocations.
88 // There are a few in each CodeBuffer.
89 // They are filled concurrently, and concatenated at the end.
90 class CodeSection {
91 friend class CodeBuffer;
92 friend class SCCReader;
93 public:
94 typedef int csize_t; // code size type; would be size_t except for history
95
96 private:
97 address _start; // first byte of contents (instructions)
98 address _mark; // user mark, usually an instruction beginning
99 address _end; // current end address
100 address _limit; // last possible (allocated) end address
101 relocInfo* _locs_start; // first byte of relocation information
102 relocInfo* _locs_end; // first byte after relocation information
103 relocInfo* _locs_limit; // first byte after relocation information buf
104 address _locs_point; // last relocated position (grows upward)
105 bool _locs_own; // did I allocate the locs myself?
106 bool _scratch_emit; // Buffer is used for scratch emit, don't relocate.
107 int _skipped_instructions_size;
108 int8_t _index; // my section number (SECT_INST, etc.)
109 CodeBuffer* _outer; // enclosing CodeBuffer
110
111 // (Note: _locs_point used to be called _last_reloc_offset.)
112
267
268 // Emit a relocation.
269 void relocate(address at, RelocationHolder const& rspec, int format = 0);
270 void relocate(address at, relocInfo::relocType rtype, int format = 0, jint method_index = 0);
271
272 int alignment() const;
273
274 // Slop between sections, used only when allocating temporary BufferBlob buffers.
275 static csize_t end_slop() { return MAX2((int)sizeof(jdouble), (int)CodeEntryAlignment); }
276
277 csize_t align_at_start(csize_t off) const {
278 return (csize_t) align_up(off, alignment());
279 }
280
281 // Ensure there's enough space left in the current section.
282 // Return true if there was an expansion.
283 bool maybe_expand_to_ensure_remaining(csize_t amount);
284
285 #ifndef PRODUCT
286 void decode();
287 void print_on(outputStream* st, const char* name);
288 #endif //PRODUCT
289 };
290
291
292 #ifndef PRODUCT
293
294 class AsmRemarkCollection;
295 class DbgStringCollection;
296
297 // The assumption made here is that most code remarks (or comments) added to
298 // the generated assembly code are unique, i.e. there is very little gain in
299 // trying to share the strings between the different offsets tracked in a
300 // buffer (or blob).
301
302 class AsmRemarks {
303 public:
304 AsmRemarks();
305 ~AsmRemarks();
306
307 const char* insert(uint offset, const char* remstr);
370 // (1) A CodeBuffer referring to an already allocated piece of memory:
371 // This is used to direct 'static' code generation (e.g. for interpreter
372 // or stubroutine generation, etc.). This code comes with NO relocation
373 // information.
374 //
375 // (2) A CodeBuffer referring to a piece of memory allocated when the
376 // CodeBuffer is allocated. This is used for nmethod generation.
377 //
378 // The memory can be divided up into several parts called sections.
379 // Each section independently accumulates code (or data) an relocations.
380 // Sections can grow (at the expense of a reallocation of the BufferBlob
381 // and recopying of all active sections). When the buffered code is finally
382 // written to an nmethod (or other CodeBlob), the contents (code, data,
383 // and relocations) of the sections are padded to an alignment and concatenated.
384 // Instructions and data in one section can contain relocatable references to
385 // addresses in a sibling section.
386
387 class CodeBuffer: public StackObj DEBUG_ONLY(COMMA private Scrubber) {
388 friend class CodeSection;
389 friend class StubCodeGenerator;
390 friend class SCCReader;
391
392 private:
393 // CodeBuffers must be allocated on the stack except for a single
394 // special case during expansion which is handled internally. This
395 // is done to guarantee proper cleanup of resources.
396 void* operator new(size_t size) throw() { return resource_allocate_bytes(size); }
397 void operator delete(void* p) { ShouldNotCallThis(); }
398
399 public:
400 typedef int csize_t; // code size type; would be size_t except for history
401 enum : int8_t {
402 // Here is the list of all possible sections. The order reflects
403 // the final layout.
404 SECT_FIRST = 0,
405 SECT_CONSTS = SECT_FIRST, // Non-instruction data: Floats, jump tables, etc.
406 SECT_INSTS, // Executable instructions.
407 SECT_STUBS, // Outbound trampolines for supporting call sites.
408 SECT_LIMIT, SECT_NONE = -1
409 };
410
725 const char* code_string(const char* str) PRODUCT_RETURN_(return nullptr;);
726
727 // Log a little info about section usage in the CodeBuffer
728 void log_section_sizes(const char* name);
729
730 // Make a set of stubs final. It can create/optimize stubs.
731 bool finalize_stubs();
732
733 // Request for a shared stub to the interpreter
734 void shared_stub_to_interp_for(ciMethod* callee, csize_t call_offset);
735
736 void set_const_section_alignment(int align) {
737 _const_section_alignment = align_up(align, HeapWordSize);
738 }
739
740 #ifndef PRODUCT
741 public:
742 // Printing / Decoding
743 // decodes from decode_begin() to code_end() and sets decode_begin to end
744 void decode();
745 void print_on(outputStream* st);
746 #endif
747 // Directly disassemble code buffer.
748 void decode(address start, address end);
749
750 // The following header contains architecture-specific implementations
751 #include CPU_HEADER(codeBuffer)
752
753 };
754
755 // A Java method can have calls of Java methods which can be statically bound.
756 // Calls of Java methods need stubs to the interpreter. Calls sharing the same Java method
757 // can share a stub to the interpreter.
758 // A SharedStubToInterpRequest is a request for a shared stub to the interpreter.
759 class SharedStubToInterpRequest : public ResourceObj {
760 private:
761 ciMethod* _shared_method;
762 CodeBuffer::csize_t _call_offset; // The offset of the call in CodeBuffer
763
764 public:
765 SharedStubToInterpRequest(ciMethod* method = nullptr, CodeBuffer::csize_t call_offset = -1) : _shared_method(method),
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