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c03e25a263
This ensures that the tests are testing the current linker sources, not the installed linker. Change-Id: I14a2ca9d413e1af57c7b5a00657c72023626a651 Reviewed-on: https://go-review.googlesource.com/c/go/+/721220 Reviewed-by: David Chase <drchase@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
111 lines
3.4 KiB
Go
111 lines
3.4 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This program generates a test to verify that a program can be
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// successfully linked even when there are very large text
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// sections present.
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package main
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import (
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"bytes"
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"fmt"
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"internal/buildcfg"
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"internal/testenv"
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"os"
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"testing"
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)
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func TestLargeText(t *testing.T) {
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if testing.Short() || (buildcfg.GOARCH != "ppc64le" && buildcfg.GOARCH != "ppc64" && buildcfg.GOARCH != "arm") {
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t.Skipf("Skipping large text section test in short mode or on %s", buildcfg.GOARCH)
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}
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testenv.MustHaveGoBuild(t)
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var w bytes.Buffer
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const FN = 4
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tmpdir := t.TempDir()
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if err := os.WriteFile(tmpdir+"/go.mod", []byte("module big_test\n"), 0666); err != nil {
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t.Fatal(err)
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}
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// Generate the scenario where the total amount of text exceeds the
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// limit for the jmp/call instruction, on RISC architectures like ppc64le,
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// which is 2^26. When that happens the call requires special trampolines or
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// long branches inserted by the linker where supported.
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// Multiple .s files are generated instead of one.
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instOnArch := map[string]string{
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"ppc64": "\tMOVD\tR0,R3\n",
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"ppc64le": "\tMOVD\tR0,R3\n",
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"arm": "\tMOVW\tR0,R1\n",
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}
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inst := instOnArch[buildcfg.GOARCH]
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for j := 0; j < FN; j++ {
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testname := fmt.Sprintf("bigfn%d", j)
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fmt.Fprintf(&w, "TEXT ยท%s(SB),$0\n", testname)
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for i := 0; i < 2200000; i++ {
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w.WriteString(inst)
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}
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fmt.Fprintf(&w, "\tRET\n")
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err := os.WriteFile(tmpdir+"/"+testname+".s", w.Bytes(), 0666)
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if err != nil {
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t.Fatalf("can't write output: %v\n", err)
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}
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w.Reset()
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}
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fmt.Fprintf(&w, "package main\n")
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fmt.Fprintf(&w, "\nimport (\n")
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fmt.Fprintf(&w, "\t\"os\"\n")
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fmt.Fprintf(&w, "\t\"fmt\"\n")
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fmt.Fprintf(&w, ")\n\n")
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for i := 0; i < FN; i++ {
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fmt.Fprintf(&w, "func bigfn%d()\n", i)
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}
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fmt.Fprintf(&w, "\nfunc main() {\n")
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// There are lots of dummy code generated in the .s files just to generate a lot
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// of text. Link them in but guard their call so their code is not executed but
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// the main part of the program can be run.
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fmt.Fprintf(&w, "\tif os.Getenv(\"LINKTESTARG\") != \"\" {\n")
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for i := 0; i < FN; i++ {
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fmt.Fprintf(&w, "\t\tbigfn%d()\n", i)
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}
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fmt.Fprintf(&w, "\t}\n")
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fmt.Fprintf(&w, "\tfmt.Printf(\"PASS\\n\")\n")
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fmt.Fprintf(&w, "}")
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err := os.WriteFile(tmpdir+"/bigfn.go", w.Bytes(), 0666)
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if err != nil {
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t.Fatalf("can't write output: %v\n", err)
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}
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// Build and run with internal linking.
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cmd := goCmd(t, "build", "-o", "bigtext")
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cmd.Dir = tmpdir
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out, err := cmd.CombinedOutput()
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if err != nil {
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t.Fatalf("Build failed for big text program with internal linking: %v, output: %s", err, out)
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}
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cmd = testenv.Command(t, "./bigtext")
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cmd.Dir = tmpdir
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out, err = cmd.CombinedOutput()
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if err != nil {
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t.Fatalf("Program built with internal linking failed to run with err %v, output: %s", err, out)
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}
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// Build and run with external linking
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cmd = goCmd(t, "build", "-o", "bigtext", "-ldflags", "-linkmode=external")
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cmd.Dir = tmpdir
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out, err = cmd.CombinedOutput()
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if err != nil {
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t.Fatalf("Build failed for big text program with external linking: %v, output: %s", err, out)
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}
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cmd = testenv.Command(t, "./bigtext")
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cmd.Dir = tmpdir
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out, err = cmd.CombinedOutput()
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if err != nil {
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t.Fatalf("Program built with external linking failed to run with err %v, output: %s", err, out)
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}
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}
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