// may have a nil ReaderAt.
	io.ReaderAt
	sr *io.SectionReader

	compressionType   CompressionType
	compressionOffset int64
}

// Data reads and returns the contents of the ELF section.
// Even if the section is stored compressed in the ELF file,
// Data returns uncompressed data.
//
// For an [SHT_NOBITS] section, Data always returns a non-nil error.

	if p.UsesCgo() || p.UsesSwig() {
		if pcCFLAGS, pcLDFLAGS, err = b.getPkgConfigFlags(a); err != nil {
			return
		}
	}

	// Compute overlays for .c/.cc/.h/etc. and if there are any overlays
	// put correct contents of all those files in the objdir, to ensure
	// the correct headers are included. nonGoOverlay is the overlay that
	// points from nongo files to the copied files in objdir.

			execCmd = []string{path}
		}
	})
	return execCmd
}

// checkExpectedOutput compares the output from compiling and/or running with the contents
// of the corresponding reference output file, if any (replace ".go" with ".out").
// If they don't match, fail with an informative message.
func (t test) checkExpectedOutput(gotBytes []byte) error {

		if off == 2*c.PtrSize {
			return int32(types.TypeHash(ti.Type.(*types.Type)))
		}
	}
	base.Fatalf("fixed32 data not known for %s:%d", sym, off)
	return 0
}

// isFixedSym returns true if the contents of sym at the given offset
// is known and is the constant address of another symbol.
func isFixedSym(sym Sym, off int64) bool {
	lsym := sym.(*obj.LSym)
	switch {
	case lsym.Type == objabi.SRODATA:

A string value is a (possibly empty) sequence of bytes.
The number of bytes is called the length of the string and is never negative.
Strings are immutable: once created,
it is impossible to change the contents of a string.
The predeclared string type is <code>string</code>;
it is a <a href="#Type_definitions">defined type</a>.
</p>

<p>
The length of a string <code>s</code> can be discovered using

			t.Fatalf("extension #%d has unexpected type %v (expected %v)", i, extension.Id, expected[i].Id)
		}

		if !bytes.Equal(extension.Value, expected[i].Value) {
			t.Fatalf("extension #%d has unexpected contents %x (expected %x)", i, extension.Value, expected[i].Value)
		}
	}
}

// serialiseAndParse generates a self-signed certificate from template and
// returns a parsed version of it.

	ctxt.tramps = append(ctxt.tramps, s.Sym())
	if *FlagDebugTramp > 0 && ctxt.Debugvlog > 0 {
		ctxt.Logf("trampoline %s inserted\n", s.Name())
	}
}

// compressSyms compresses syms and returns the contents of the
// compressed section. If the section would get larger, it returns nil.
func compressSyms(ctxt *Link, syms []loader.Sym) []byte {
	ldr := ctxt.loader
	var total int64
	for _, sym := range syms {