go/src/pkg/runtime/funcdata.h

// Copyright 2013 The Go Authors.  All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// This file defines the IDs for PCDATA and FUNCDATA instructions
// in Go binaries. It is included by both C and assembly, so it must
// be written using #defines. It is included by the runtime package
// as well as the compilers.

#define PCDATA_ArgSize 0 /* argument size at CALL instruction */

#define FUNCDATA_GCArgs 0 /* garbage collector blocks */
#define FUNCDATA_GCLocals 1

// To be used in assembly.
#define ARGSIZE(n) PCDATA $PCDATA_ArgSize, $n

// ArgsSizeUnknown is set in Func.argsize to mark all functions
// whose argument size is unknown (C vararg functions, and
// assembly code without an explicit specification).
// This value is generated by the compiler, assembler, or linker.
#define ArgsSizeUnknown 0x80000000
runtime: record argument size in assembly functions I have not done the system call stubs in sys_*.s. I hope to avoid that, because those do not block, so those frames will not appear in stack traces during garbage collection. R=golang-dev, dvyukov, khr CC=golang-dev https://golang.org/cl/11360043 2013-07-16 14:24:09 -06:00			`// Copyright 2013 The Go Authors. All rights reserved.`
			`// Use of this source code is governed by a BSD-style`
			`// license that can be found in the LICENSE file.`

			`// This file defines the IDs for PCDATA and FUNCDATA instructions`
			`// in Go binaries. It is included by both C and assembly, so it must`
			`// be written using #defines. It is included by the runtime package`
			`// as well as the compilers.`

runtime: use funcdata to supply garbage collection information This CL introduces a FUNCDATA number for runtime-specific garbage collection metadata, changes the C and Go compilers to emit that metadata, and changes the runtime to expect it. The old pseudo-instructions that carried this information are gone, as is the linker code to process them. R=golang-dev, dvyukov, cshapiro CC=golang-dev https://golang.org/cl/11406044 2013-07-19 14:04:09 -06:00			`#define PCDATA_ArgSize 0 /* argument size at CALL instruction */`

cmd/cc, cmd/gc, runtime: emit bitmaps for scanning locals. Previously, all word aligned locations in the local variables area were scanned as conservative roots. With this change, a bitmap is generated describing the locations of pointer values in local variables. With this change the argument bitmap information has been changed to only store information about arguments. The locals member, has been removed. In its place, the bitmap data for local variables is now used to store the size of locals. If the size is negative, the magnitude indicates the size of the local variables area. R=rsc CC=golang-dev https://golang.org/cl/12328044 2013-08-07 13:47:01 -06:00			`#define FUNCDATA_GCArgs 0 /* garbage collector blocks */`
			`#define FUNCDATA_GCLocals 1`
runtime: record argument size in assembly functions I have not done the system call stubs in sys_*.s. I hope to avoid that, because those do not block, so those frames will not appear in stack traces during garbage collection. R=golang-dev, dvyukov, khr CC=golang-dev https://golang.org/cl/11360043 2013-07-16 14:24:09 -06:00
			`// To be used in assembly.`
			`#define ARGSIZE(n) PCDATA $PCDATA_ArgSize, $n`
runtime: cleanup: use ArgsSizeUnknown to mark all functions whose argument size is unknown (C vararg functions, and assembly code without an explicit specification). We used to use 0 to mean "unknown" and 1 to mean "zero". Now we use ArgsSizeUnknown (0x80000000) to mean "unknown". R=golang-dev, rsc CC=golang-dev https://golang.org/cl/11590043 2013-07-19 12:19:18 -06:00
			`// ArgsSizeUnknown is set in Func.argsize to mark all functions`
			`// whose argument size is unknown (C vararg functions, and`
			`// assembly code without an explicit specification).`
			`// This value is generated by the compiler, assembler, or linker.`
			`#define ArgsSizeUnknown 0x80000000`