2013-07-16 14:24:09 -06:00
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// Copyright 2013 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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// This file defines the IDs for PCDATA and FUNCDATA instructions
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// in Go binaries. It is included by both C and assembly, so it must
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// be written using #defines. It is included by the runtime package
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// as well as the compilers.
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2014-09-03 11:02:48 -06:00
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//
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// symtab.go also contains a copy of these constants.
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2013-07-16 14:24:09 -06:00
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2014-09-11 22:18:20 -06:00
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// TODO(rsc): Remove PCDATA_ArgSize, renumber StackMapIndex to 0.
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2013-07-19 14:04:09 -06:00
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#define PCDATA_ArgSize 0 /* argument size at CALL instruction */
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cmd/5g, cmd/5l, cmd/6g, cmd/6l, cmd/8g, cmd/8l, cmd/gc, runtime: generate pointer maps by liveness analysis
This change allows the garbage collector to examine stack
slots that are determined as live and containing a pointer
value by the garbage collector. This results in a mean
reduction of 65% in the number of stack slots scanned during
an invocation of "GOGC=1 all.bash".
Unfortunately, this does not yet allow garbage collection to
be precise for the stack slots computed as live. Pointers
confound the determination of what definitions reach a given
instruction. In general, this problem is not solvable without
runtime cost but some advanced cooperation from the compiler
might mitigate common cases.
R=golang-dev, rsc, cshapiro
CC=golang-dev
https://golang.org/cl/14430048
2013-12-05 18:35:22 -07:00
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#define PCDATA_StackMapIndex 1
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2013-07-19 14:04:09 -06:00
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2014-08-28 20:08:09 -06:00
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#define FUNCDATA_ArgsPointerMaps 0 /* garbage collector blocks */
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#define FUNCDATA_LocalsPointerMaps 1
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#define FUNCDATA_DeadValueMaps 2
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2013-07-16 14:24:09 -06:00
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2014-09-11 22:18:20 -06:00
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// TODO(rsc): Remove ARGSIZE.
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2013-07-16 14:24:09 -06:00
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// To be used in assembly.
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#define ARGSIZE(n) PCDATA $PCDATA_ArgSize, $n
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2013-07-19 12:19:18 -06:00
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2014-09-11 22:18:20 -06:00
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// Pseudo-assembly statements.
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// GO_ARGS, GO_RESULTS_INITIALIZED, and NO_LOCAL_POINTERS are macros
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// that communicate to the runtime information about the location and liveness
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// of pointers in an assembly function's arguments, results, and stack frame.
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// This communication is only required in assembly functions that make calls
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// to other functions that might be preempted or grow the stack.
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// NOSPLIT functions that make no calls do not need to use these macros.
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// GO_ARGS indicates that the Go prototype for this assembly function
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// defines the pointer map for the function's arguments.
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// GO_ARGS should be the first instruction in a function that uses it.
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// It can be omitted if there are no arguments at all.
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#define GO_ARGS FUNCDATA $FUNCDATA_ArgsPointerMaps, go_args_stackmap(SB)
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// GO_RESULTS_INITIALIZED indicates that the assembly function
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// has initialized the stack space for its results and that those results
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// should be considered live for the remainder of the function.
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#define GO_RESULTS_INITIALIZED FUNCDATA PCDATA $PCDATA_StackMapIndex, 1
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// NO_LOCAL_POINTERS indicates that the assembly function stores
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// no pointers to heap objects in its local stack variables.
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#define NO_LOCAL_POINTERS FUNCDATA $FUNCDATA_LocalsPointerMaps, runtime·no_pointers_stackmap(SB)
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2013-07-19 12:19:18 -06:00
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// ArgsSizeUnknown is set in Func.argsize to mark all functions
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// whose argument size is unknown (C vararg functions, and
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// assembly code without an explicit specification).
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// This value is generated by the compiler, assembler, or linker.
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#define ArgsSizeUnknown 0x80000000
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2014-07-02 13:41:29 -06:00
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/*c2go
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enum {
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PCDATA_ArgSize = 0,
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PCDATA_StackMapIndex = 1,
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2014-08-28 20:08:09 -06:00
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FUNCDATA_ArgsPointerMaps = 0,
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FUNCDATA_LocalsPointerMaps = 1,
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FUNCDATA_DeadValueMaps = 2,
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2014-07-02 13:41:29 -06:00
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ArgsSizeUnknown = 0x80000000,
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};
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*/
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