asm_arm64.s

Documentation: reflect

     1// Copyright 2012 The Go Authors. All rights reserved.
     2// Use of this source code is governed by a BSD-style
     3// license that can be found in the LICENSE file.
     4
     5#include "textflag.h"
     6#include "funcdata.h"
     7
     8// The frames of each of the two functions below contain two locals, at offsets
     9// that are known to the runtime.
    10//
    11// The first local is a bool called retValid with a whole pointer-word reserved
    12// for it on the stack. The purpose of this word is so that the runtime knows
    13// whether the stack-allocated return space contains valid values for stack
    14// scanning.
    15//
    16// The second local is an abi.RegArgs value whose offset is also known to the
    17// runtime, so that a stack map for it can be constructed, since it contains
    18// pointers visible to the GC.
    19#define LOCAL_RETVALID 40
    20#define LOCAL_REGARGS 48
    21
    22// The frame size of the functions below is
    23// 32 (args of callReflect) + 8 (bool + padding) + 392 (abi.RegArgs) = 432.
    24
    25// makeFuncStub is the code half of the function returned by MakeFunc.
    26// See the comment on the declaration of makeFuncStub in makefunc.go
    27// for more details.
    28// No arg size here, runtime pulls arg map out of the func value.
    29TEXT ·makeFuncStub(SB),(NOSPLIT|WRAPPER),$432
    30	NO_LOCAL_POINTERS
    31	// NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this
    32	// frame is specially handled in the runtime. See the comment above LOCAL_RETVALID.
    33	ADD	$LOCAL_REGARGS, RSP, R20
    34	CALL	runtime·spillArgs(SB)
    35	MOVD	R26, 32(RSP) // outside of moveMakeFuncArgPtrs's arg area
    36	MOVD	R26, R0
    37	MOVD	R20, R1
    38	CALL	·moveMakeFuncArgPtrs<ABIInternal>(SB)
    39	MOVD	32(RSP), R26
    40	MOVD	R26, 8(RSP)
    41	MOVD	$argframe+0(FP), R3
    42	MOVD	R3, 16(RSP)
    43	MOVB	$0, LOCAL_RETVALID(RSP)
    44	ADD	$LOCAL_RETVALID, RSP, R3
    45	MOVD	R3, 24(RSP)
    46	ADD	$LOCAL_REGARGS, RSP, R3
    47	MOVD	R3, 32(RSP)
    48	CALL	·callReflect(SB)
    49	ADD	$LOCAL_REGARGS, RSP, R20
    50	CALL	runtime·unspillArgs(SB)
    51	RET
    52
    53// methodValueCall is the code half of the function returned by makeMethodValue.
    54// See the comment on the declaration of methodValueCall in makefunc.go
    55// for more details.
    56// No arg size here; runtime pulls arg map out of the func value.
    57TEXT ·methodValueCall(SB),(NOSPLIT|WRAPPER),$432
    58	NO_LOCAL_POINTERS
    59	// NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this
    60	// frame is specially handled in the runtime. See the comment above LOCAL_RETVALID.
    61	ADD	$LOCAL_REGARGS, RSP, R20
    62	CALL	runtime·spillArgs(SB)
    63	MOVD	R26, 32(RSP) // outside of moveMakeFuncArgPtrs's arg area
    64	MOVD	R26, R0
    65	MOVD	R20, R1
    66	CALL	·moveMakeFuncArgPtrs<ABIInternal>(SB)
    67	MOVD	32(RSP), R26
    68	MOVD	R26, 8(RSP)
    69	MOVD	$argframe+0(FP), R3
    70	MOVD	R3, 16(RSP)
    71	MOVB	$0, LOCAL_RETVALID(RSP)
    72	ADD	$LOCAL_RETVALID, RSP, R3
    73	MOVD	R3, 24(RSP)
    74	ADD	$LOCAL_REGARGS, RSP, R3
    75	MOVD	R3, 32(RSP)
    76	CALL	·callMethod(SB)
    77	ADD	$LOCAL_REGARGS, RSP, R20
    78	CALL	runtime·unspillArgs(SB)
    79	RET
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