github.com/twelsh-aw/go/src@v0.0.0-20230516233729-a56fe86a7c81/runtime/internal/startlinetest/func_amd64.s (about)

     1  // Copyright 2022 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 "funcdata.h"
     6  #include "textflag.h"
     7  
     8  // Assembly function for runtime_test.TestStartLineAsm.
     9  //
    10  // Note that this file can't be built directly as part of runtime_test, as assembly
    11  // files can't declare an alternative package. Building it into runtime is
    12  // possible, but linkshared complicates things:
    13  //
    14  //  1. linkshared mode leaves the function around in the final output of
    15  //     non-test builds.
    16  //  2. Due of (1), the linker can't resolve the callerStartLine relocation
    17  //     (as runtime_test isn't built for non-test builds).
    18  //
    19  // Thus it is simpler to just put this in its own package, imported only by
    20  // runtime_test. We use ABIInternal as no ABI wrapper is generated for
    21  // callerStartLine since it is in a different package.
    22  
    23  TEXT	·AsmFunc<ABIInternal>(SB),NOSPLIT,$8-0
    24  	NO_LOCAL_POINTERS
    25  	MOVQ	$0, AX // wantInlined
    26  	MOVQ	·CallerStartLine(SB), DX
    27  	CALL	(DX)
    28  	RET