File: semantic-interposition.c

package info (click to toggle)
llvm-toolchain-15 1%3A15.0.6-4
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,554,644 kB
  • sloc: cpp: 5,922,452; ansic: 1,012,136; asm: 674,362; python: 191,568; objc: 73,855; f90: 42,327; lisp: 31,913; pascal: 11,973; javascript: 10,144; sh: 9,421; perl: 7,447; ml: 5,527; awk: 3,523; makefile: 2,520; xml: 885; cs: 573; fortran: 567
file content (38 lines) | stat: -rw-r--r-- 1,691 bytes parent folder | download | duplicates (3)
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
34
35
36
37
38
/// -fno-semantic-interposition is the default and local aliases (via dso_local) are allowed.
// RUN: %clang_cc1 -no-opaque-pointers -triple x86_64-linux-gnu -emit-llvm -mrelocation-model pic -pic-level 1 %s -o - | FileCheck %s --check-prefixes=CHECK,NOMETADATA

/// -fsemantic-interposition sets a module metadata.
// RUN: %clang_cc1 -no-opaque-pointers -triple x86_64-linux-gnu -emit-llvm -mrelocation-model pic -pic-level 1 -fsemantic-interposition %s -o - | FileCheck %s --check-prefixes=PREEMPT,METADATA

/// Traditional half-baked behavior: interprocedural optimizations are allowed
/// but local aliases are not used.
// RUN: %clang_cc1 -no-opaque-pointers -triple x86_64-linux-gnu -emit-llvm -mrelocation-model pic -pic-level 1 -fhalf-no-semantic-interposition %s -o - | FileCheck %s --check-prefixes=PREEMPT,NOMETADATA

// CHECK: @var = global i32 0, align 4
// CHECK: @ext_var = external global i32, align 4
// CHECK: @ifunc = ifunc i32 (), bitcast (i8* ()* @ifunc_resolver to i32 ()* ()*)
// CHECK: define dso_local i32 @func()
// CHECK: declare i32 @ext()

// PREEMPT: @var = global i32 0, align 4
// PREEMPT: @ext_var = external global i32, align 4
// PREEMPT: @ifunc = ifunc i32 (), bitcast (i8* ()* @ifunc_resolver to i32 ()* ()*)
// PREEMPT: define i32 @func()
// PREEMPT: declare i32 @ext()

// METADATA:           !{{[0-9]+}} = !{i32 1, !"SemanticInterposition", i32 1}
// NOMETADATA-NOT:     "SemanticInterposition"

int var;
extern int ext_var;

int ifunc(void) __attribute__((ifunc("ifunc_resolver")));

int func(void) { return 0; }
int ext(void);

static void *ifunc_resolver(void) { return func; }

int foo(void) {
  return var + ext_var + ifunc() + func() + ext();
}