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Code Editor : linkbig_test.go
// Copyright 2016 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // This program generates a test to verify that a program can be // successfully linked even when there are very large text // sections present. package main import ( "bytes" "cmd/internal/objabi" "fmt" "internal/testenv" "io/ioutil" "os" "os/exec" "testing" ) func TestLargeText(t *testing.T) { if testing.Short() || (objabi.GOARCH != "ppc64le" && objabi.GOARCH != "ppc64" && objabi.GOARCH != "arm") { t.Skipf("Skipping large text section test in short mode or on %s", objabi.GOARCH) } testenv.MustHaveGoBuild(t) var w bytes.Buffer const FN = 4 tmpdir, err := ioutil.TempDir("", "bigtext") if err != nil { t.Fatalf("can't create temp directory: %v\n", err) } defer os.RemoveAll(tmpdir) // Generate the scenario where the total amount of text exceeds the // limit for the jmp/call instruction, on RISC architectures like ppc64le, // which is 2^26. When that happens the call requires special trampolines or // long branches inserted by the linker where supported. // Multiple .s files are generated instead of one. instOnArch := map[string]string{ "ppc64": "\tMOVD\tR0,R3\n", "ppc64le": "\tMOVD\tR0,R3\n", "arm": "\tMOVW\tR0,R1\n", } inst := instOnArch[objabi.GOARCH] for j := 0; j < FN; j++ { testname := fmt.Sprintf("bigfn%d", j) fmt.Fprintf(&w, "TEXT ยท%s(SB),$0\n", testname) for i := 0; i < 2200000; i++ { fmt.Fprintf(&w, inst) } fmt.Fprintf(&w, "\tRET\n") err := ioutil.WriteFile(tmpdir+"/"+testname+".s", w.Bytes(), 0666) if err != nil { t.Fatalf("can't write output: %v\n", err) } w.Reset() } fmt.Fprintf(&w, "package main\n") fmt.Fprintf(&w, "\nimport (\n") fmt.Fprintf(&w, "\t\"os\"\n") fmt.Fprintf(&w, "\t\"fmt\"\n") fmt.Fprintf(&w, ")\n\n") for i := 0; i < FN; i++ { fmt.Fprintf(&w, "func bigfn%d()\n", i) } fmt.Fprintf(&w, "\nfunc main() {\n") // There are lots of dummy code generated in the .s files just to generate a lot // of text. Link them in but guard their call so their code is not executed but // the main part of the program can be run. fmt.Fprintf(&w, "\tif os.Getenv(\"LINKTESTARG\") != \"\" {\n") for i := 0; i < FN; i++ { fmt.Fprintf(&w, "\t\tbigfn%d()\n", i) } fmt.Fprintf(&w, "\t}\n") fmt.Fprintf(&w, "\tfmt.Printf(\"PASS\\n\")\n") fmt.Fprintf(&w, "}") err = ioutil.WriteFile(tmpdir+"/bigfn.go", w.Bytes(), 0666) if err != nil { t.Fatalf("can't write output: %v\n", err) } // Build and run with internal linking. os.Chdir(tmpdir) cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "bigtext") out, err := cmd.CombinedOutput() if err != nil { t.Fatalf("Build failed for big text program with internal linking: %v, output: %s", err, out) } cmd = exec.Command(tmpdir + "/bigtext") out, err = cmd.CombinedOutput() if err != nil { t.Fatalf("Program built with internal linking failed to run with err %v, output: %s", err, out) } // Build and run with external linking os.Chdir(tmpdir) cmd = exec.Command(testenv.GoToolPath(t), "build", "-o", "bigtext", "-ldflags", "'-linkmode=external'") out, err = cmd.CombinedOutput() if err != nil { t.Fatalf("Build failed for big text program with external linking: %v, output: %s", err, out) } cmd = exec.Command(tmpdir + "/bigtext") out, err = cmd.CombinedOutput() if err != nil { t.Fatalf("Program built with external linking failed to run with err %v, output: %s", err, out) } }
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