File: arm-vaarg.cpp

package info (click to toggle)
swiftlang 6.1.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,791,604 kB
  • sloc: cpp: 9,901,740; ansic: 2,201,431; asm: 1,091,827; python: 308,252; objc: 82,166; f90: 80,126; lisp: 38,358; pascal: 25,559; sh: 20,429; ml: 5,058; perl: 4,745; makefile: 4,484; awk: 3,535; javascript: 3,018; xml: 918; fortran: 664; cs: 573; ruby: 396
file content (25 lines) | stat: -rw-r--r-- 747 bytes parent folder | download | duplicates (14) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
 
// RUN: %clang_cc1 -triple armv7-apple-ios -emit-llvm -o - %s | FileCheck %s
struct Empty {};

Empty emptyvar;

int take_args(int a, ...) {
  __builtin_va_list l;
  __builtin_va_start(l, a);
// CHECK: call void @llvm.va_start

  emptyvar = __builtin_va_arg(l, Empty);
// CHECK: load ptr, ptr

  // It's conceivable that EMPTY_PTR may not actually be a valid pointer
  // (e.g. it's at the very bottom of the stack and the next page is
  // invalid). This doesn't matter provided it's never loaded (there's no
  // well-defined way to tell), but it becomes a problem if we do try to use it.
// CHECK-NOT: load %struct.Empty, ptr {{%[a-zA-Z0-9._]+}}

  int i = __builtin_va_arg(l, int);
// CHECK: load i32, ptr

  __builtin_va_end(l);
  return i;
}