data_test.go

Documentation: cmd/link/internal/ld

     1  // Copyright 2020 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  package ld
     6  
     7  import (
     8  	"cmd/internal/objabi"
     9  	"cmd/internal/sys"
    10  	"cmd/link/internal/loader"
    11  	"internal/buildcfg"
    12  	"testing"
    13  )
    14  
    15  func setUpContext(arch *sys.Arch, iself bool, ht objabi.HeadType, bm, lm string) *Link {
    16  	ctxt := linknew(arch)
    17  	edummy := func(str string, off int) {}
    18  	ctxt.HeadType = ht
    19  	er := loader.ErrorReporter{}
    20  	ctxt.loader = loader.NewLoader(0, edummy, &er)
    21  	ctxt.BuildMode.Set(bm)
    22  	ctxt.LinkMode.Set(lm)
    23  	ctxt.IsELF = iself
    24  	ctxt.mustSetHeadType()
    25  	ctxt.setArchSyms()
    26  	return ctxt
    27  }
    28  
    29  // Make sure the addgotsym properly increases the symbols.
    30  func TestAddGotSym(t *testing.T) {
    31  	tests := []struct {
    32  		arch    *sys.Arch
    33  		ht      objabi.HeadType
    34  		bm, lm  string
    35  		rel     string
    36  		relsize int
    37  		gotsize int
    38  	}{
    39  		{
    40  			arch:    sys.Arch386,
    41  			ht:      objabi.Hlinux,
    42  			bm:      "pie",
    43  			lm:      "internal",
    44  			rel:     ".rel",
    45  			relsize: 2 * sys.Arch386.PtrSize,
    46  			gotsize: sys.Arch386.PtrSize,
    47  		},
    48  		{
    49  			arch:    sys.ArchAMD64,
    50  			ht:      objabi.Hlinux,
    51  			bm:      "pie",
    52  			lm:      "internal",
    53  			rel:     ".rela",
    54  			relsize: 3 * sys.ArchAMD64.PtrSize,
    55  			gotsize: sys.ArchAMD64.PtrSize,
    56  		},
    57  		{
    58  			arch:    sys.ArchAMD64,
    59  			ht:      objabi.Hdarwin,
    60  			bm:      "pie",
    61  			lm:      "external",
    62  			gotsize: sys.ArchAMD64.PtrSize,
    63  		},
    64  	}
    65  
    66  	// Save the architecture as we're going to set it on each test run.
    67  	origArch := buildcfg.GOARCH
    68  	defer func() {
    69  		buildcfg.GOARCH = origArch
    70  	}()
    71  
    72  	for i, test := range tests {
    73  		iself := len(test.rel) != 0
    74  		buildcfg.GOARCH = test.arch.Name
    75  		ctxt := setUpContext(test.arch, iself, test.ht, test.bm, test.lm)
    76  		foo := ctxt.loader.CreateSymForUpdate("foo", 0)
    77  		ctxt.loader.CreateExtSym("bar", 0)
    78  		AddGotSym(&ctxt.Target, ctxt.loader, &ctxt.ArchSyms, foo.Sym(), 0)
    79  
    80  		if iself {
    81  			rel := ctxt.loader.Lookup(test.rel, 0)
    82  			if rel == 0 {
    83  				t.Fatalf("[%d] could not find symbol: %q", i, test.rel)
    84  			}
    85  			if s := ctxt.loader.SymSize(rel); s != int64(test.relsize) {
    86  				t.Fatalf("[%d] expected ldr.Size(%q) == %v, got %v", i, test.rel, test.relsize, s)
    87  			}
    88  		}
    89  		if s := ctxt.loader.SymSize(ctxt.loader.Lookup(".got", 0)); s != int64(test.gotsize) {
    90  			t.Fatalf(`[%d] expected ldr.Size(".got") == %v, got %v`, i, test.gotsize, s)
    91  		}
    92  	}
    93  }
    94
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