43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Garbage collector (GC)
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// GC instruction opcodes.
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//
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// The opcode of an instruction is followed by zero or more
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// arguments to the instruction.
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//
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// Meaning of arguments:
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// off Offset (in bytes) from the start of the current object
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// objgc Pointer to GC info of an object
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// len Length of an array
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// elemsize Size (in bytes) of an element
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// size Size (in bytes)
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enum {
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GC_END, // End of object, loop or subroutine. Args: none
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GC_PTR, // A typed pointer. Args: (off, objgc)
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GC_APTR, // Pointer to an arbitrary object. Args: (off)
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GC_ARRAY_START, // Start an array with a fixed length. Args: (off, len, elemsize)
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GC_ARRAY_NEXT, // The next element of an array. Args: none
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GC_CALL, // Call a subroutine. Args: (off, objgc)
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GC_MAP_PTR, // Go map. Args: (off, MapType*)
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GC_STRING, // Go string. Args: (off)
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GC_EFACE, // interface{}. Args: (off)
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GC_IFACE, // interface{...}. Args: (off)
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GC_SLICE, // Go slice. Args: (off, objgc)
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GC_REGION, // A region/part of the current object. Args: (off, size, objgc)
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GC_NUM_INSTR, // Number of instruction opcodes
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};
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enum {
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// Size of GC's fixed stack.
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//
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// The current GC implementation permits:
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// - at most 1 stack allocation because of GC_CALL
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// - at most GC_STACK_CAPACITY allocations because of GC_ARRAY_START
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GC_STACK_CAPACITY = 8,
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};
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