File: pointer-signext.c

package info (click to toggle)
llvm-toolchain-14 1%3A14.0.6-16
  • links: PTS, VCS
  • area: main
  • in suites: sid
  • size: 1,496,368 kB
  • sloc: cpp: 5,593,980; ansic: 986,873; asm: 585,869; python: 184,223; objc: 72,530; lisp: 31,119; f90: 27,793; javascript: 9,780; pascal: 9,762; sh: 9,482; perl: 7,468; ml: 5,432; awk: 3,523; makefile: 2,547; xml: 953; cs: 573; fortran: 567
file content (32 lines) | stat: -rw-r--r-- 906 bytes parent folder | download | duplicates (21) 
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
 
// RUN: %clang_cc1 -triple x86_64-pc-win32 -emit-llvm -O2 -o - %s | FileCheck %s

// Under Windows 64, int and long are 32-bits.  Make sure pointer math doesn't
// cause any sign extensions.

// CHECK:      [[P:%.*]] = add i64 %param, -8
// CHECK-NEXT: [[Q:%.*]] = inttoptr i64 [[P]] to [[R:%.*]]*
// CHECK-NEXT: {{%.*}} = getelementptr inbounds [[R]], [[R]]* [[Q]], i64 0, i32 0

#define CR(Record, TYPE, Field) \
  ((TYPE *) ((unsigned char *) (Record) - (unsigned char *) &(((TYPE *) 0)->Field)))

typedef struct _LIST_ENTRY {
  struct _LIST_ENTRY  *ForwardLink;
  struct _LIST_ENTRY  *BackLink;
} LIST_ENTRY;

typedef struct {
  unsigned long long    Signature;
  LIST_ENTRY            Link;
} MEMORY_MAP;

int test(unsigned long long param)
{
  LIST_ENTRY      *Link;
  MEMORY_MAP      *Entry;

  Link = (LIST_ENTRY *) param;

  Entry = CR (Link, MEMORY_MAP, Link);
  return (int) Entry->Signature;
}