File: tail-call-byval.ll

package info (click to toggle)
llvm-toolchain-17 1%3A17.0.6-22
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,799,624 kB
  • sloc: cpp: 6,428,607; ansic: 1,383,196; asm: 793,408; python: 223,504; objc: 75,364; f90: 60,502; lisp: 33,869; pascal: 15,282; sh: 9,684; perl: 7,453; ml: 4,937; awk: 3,523; makefile: 2,889; javascript: 2,149; xml: 888; fortran: 619; cs: 573
file content (33 lines) | stat: -rw-r--r-- 815 bytes parent folder | download | duplicates (12) 
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
26
27
28
29
30
31
32
33
 
; RUN: opt < %s -passes=lint -disable-output 2>&1 | FileCheck %s

%s = type { i8 }

declare void @f1(ptr)

define void @f2() {
entry:
  %c = alloca %s
  tail call void @f1(ptr %c)
  ret void
}

; Lint should complain about the tail call passing the alloca'd value %c to f1.
; CHECK: Undefined behavior: Call with "tail" keyword references alloca
; CHECK-NEXT:  tail call void @f1(ptr %c)

declare void @f3(ptr byval(%s))

define void @f4() {
entry:
  %c = alloca %s
  tail call void @f3(ptr byval(%s) %c)
  ret void
}

; Lint should not complain about passing the alloca'd %c since it's passed
; byval, effectively copying the data to the stack instead of leaking the
; pointer itself.
; CHECK-NOT: Undefined behavior: Call with "tail" keyword references alloca
; CHECK-NOT:  tail call void @f3(ptr byval(%s) %c)