issue22662.go

     1  // run
     2  
     3  // Copyright 2018 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // Verify effect of various line directives.
     8  // TODO: check columns
     9  
    10  package main
    11  
    12  import (
    13  	"fmt"
    14  	"runtime"
    15  	"strings"
    16  )
    17  
    18  // Since go.dev/issue/70478, the compiler resolves a relative filename in a
    19  // line directive against the directory of the source file, so the expected
    20  // path may be a suffix of the actual filename rather than equal to it.
    21  // Accept either an exact match or the file as a path-component suffix.
    22  // Compiler-emitted paths are always slash-normalized (cmd/internal/objabi.AbsFile).
    23  func check(file string, line int) {
    24  	_, f, l, ok := runtime.Caller(1)
    25  	if !ok {
    26  		panic("runtime.Caller(1) failed")
    27  	}
    28  	// Prepend exactly one "/" even if file already starts with one, so that
    29  	// e.g. file="/foo/bar.go" looks for "/foo/bar.go" as the suffix, not "//".
    30  	want := "/" + strings.TrimPrefix(file, "/")
    31  	if (f != file && !strings.HasSuffix(f, want)) || l != line {
    32  		panic(fmt.Sprintf("got %s:%d; want %s:%d (or suffix %s)", f, l, file, line, want))
    33  	}
    34  }
    35  
    36  func main() {
    37  //-style line directives
    38  //line :1
    39  	check("??", 1) // no file specified
    40  //line foo.go:1
    41  	check("foo.go", 1)
    42  //line bar.go:10:20
    43  	check("bar.go", 10)
    44  //line :11:22
    45  	check("bar.go", 11) // no file, but column specified => keep old filename
    46  
    47  /*-style line directives */
    48  /*line :1*/ check("??", 1) // no file specified
    49  /*line foo.go:1*/ check("foo.go", 1)
    50  /*line bar.go:10:20*/ check("bar.go", 10)
    51  /*line :11:22*/ check("bar.go", 11) // no file, but column specified => keep old filename
    52  
    53  	/*line :10*/ check("??", 10); /*line foo.go:20*/ check("foo.go", 20); /*line :30:1*/ check("foo.go", 30)
    54  	check("foo.go", 31)
    55  }
    56
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