github.com/graybobo/golang.org-package-offline-cache@v0.0.0-20200626051047-6608995c132f/x/tools/oracle/testdata/src/calls/main.go (about)

     1  package main
     2  
     3  import (
     4  	"fmt"
     5  )
     6  
     7  // Tests of call-graph queries.
     8  // See go.tools/oracle/oracle_test.go for explanation.
     9  // See calls.golden for expected query results.
    10  
    11  func A(x *int) { // @pointsto pointsto-A-x "x"
    12  	// @callers callers-A "^"
    13  	// @callstack callstack-A "^"
    14  }
    15  
    16  func B(x *int) { // @pointsto pointsto-B-x "x"
    17  	// @callers callers-B "^"
    18  }
    19  
    20  func foo() {
    21  }
    22  
    23  // apply is not (yet) treated context-sensitively.
    24  func apply(f func(x *int), x *int) {
    25  	f(x) // @callees callees-apply "f"
    26  	// @callers callers-apply "^"
    27  }
    28  
    29  // store *is* treated context-sensitively,
    30  // so the points-to sets for pc, pd are precise.
    31  func store(ptr **int, value *int) {
    32  	*ptr = value
    33  	// @callers callers-store "^"
    34  }
    35  
    36  func call(f func() *int) {
    37  	// Result points to anon function.
    38  	f() // @pointsto pointsto-result-f "f"
    39  
    40  	// Target of call is anon function.
    41  	f() // @callees callees-main.call-f "f"
    42  
    43  	// @callers callers-main.call "^"
    44  }
    45  
    46  func main() {
    47  	var a, b int
    48  	go apply(A, &a) // @callees callees-main-apply1 "app"
    49  	defer apply(B, &b)
    50  
    51  	var c, d int
    52  	var pc, pd *int // @pointsto pointsto-pc "pc"
    53  	store(&pc, &c)
    54  	store(&pd, &d)
    55  	_ = pd // @pointsto pointsto-pd "pd"
    56  
    57  	call(func() *int {
    58  		// We are called twice from main.call
    59  		// @callers callers-main.anon "^"
    60  		return &a
    61  	})
    62  
    63  	// Errors
    64  	_ = "no function call here"   // @callees callees-err-no-call "no"
    65  	print("builtin")              // @callees callees-err-builtin "builtin"
    66  	_ = string("type conversion") // @callees callees-err-conversion "str"
    67  	call(nil)                     // @callees callees-err-bad-selection "call\\(nil"
    68  	if false {
    69  		main() // @callees callees-err-deadcode1 "main"
    70  	}
    71  	var nilFunc func()
    72  	nilFunc() // @callees callees-err-nil-func "nilFunc"
    73  	var i interface {
    74  		f()
    75  	}
    76  	i.f() // @callees callees-err-nil-interface "i.f"
    77  
    78  	i = new(myint)
    79  	i.f() // @callees callees-not-a-wrapper "f"
    80  
    81  	// statically dispatched calls. Handled specially by callees, so test that they work.
    82  	foo()         // @callees callees-static-call "foo"
    83  	fmt.Println() // @callees callees-qualified-call "Println"
    84  	m := new(method)
    85  	m.f() // @callees callees-static-method-call "f"
    86  }
    87  
    88  type myint int
    89  
    90  func (myint) f() {
    91  	// @callers callers-not-a-wrapper "^"
    92  }
    93  
    94  type method int
    95  
    96  func (method) f() {
    97  }
    98  
    99  var dynamic = func() {}
   100  
   101  func deadcode() {
   102  	main() // @callees callees-err-deadcode2 "main"
   103  	// @callers callers-err-deadcode "^"
   104  	// @callstack callstack-err-deadcode "^"
   105  
   106  	// Within dead code, dynamic calls have no callees.
   107  	dynamic() // @callees callees-err-deadcode3 "dynamic"
   108  }
   109  
   110  // This code belongs to init.
   111  var global = 123 // @callers callers-global "global"
   112  
   113  // The package initializer may be called by other packages' inits, or
   114  // in this case, the root of the callgraph.  The source-level init functions
   115  // are in turn called by it.
   116  func init() {
   117  	// @callstack callstack-init "^"
   118  }