clang/test/CodeGenCXX/clang-sections.cpp

   1 // RUN: %clang_cc1 -emit-llvm -triple arm-none-eabi -o - %s | FileCheck %s --check-prefixes=CHECK,ELF
   2 // RUN: %clang_cc1 -emit-llvm -triple arm64-apple-ios -o - %s | FileCheck %s --check-prefixes=CHECK,MACHO
   3 // Test that global variables, statics and functions are attached section-attributes
   4 // as per '#pragma clang section' directives.
   5
   6 extern "C" {
   7 // test with names for each section
   8 #ifdef __MACH__
   9 #pragma clang section bss = "__BSS,__mybss1" data = "__DATA,__mydata1" rodata = "__RODATA,__myrodata1"
  10 #pragma clang section text = "__TEXT,__mytext1"
  11 #else
  12 #pragma clang section bss="my_bss.1" data="my_data.1" rodata="my_rodata.1"
  13 #pragma clang section text="my_text.1"
  14 #endif
  15 int a;      // my_bss.1
  16 int b = 1;  // my_data.1
  17 int c[4];   // my_bss.1
  18 short d[5] = {0}; // my_bss.1
  19 short e[6] = {0, 0, 1}; // my_data.1
  20 extern const int f;
  21 const int f = 2;  // my_rodata.1
  22 int foo(void) {   // my_text.1
  23   return b;
  24 }
  25 static int g[2]; // my_bss.1
  26 #pragma clang section bss=""
  27 int h; // default - .bss
  28 #ifdef __MACH__
  29 #pragma clang section data = "" bss = "__BSS,__mybss2" text = "__TEXT,__mytext2"
  30 #else
  31 #pragma clang section data=""  bss="my_bss.2" text="my_text.2"
  32 #endif
  33 int i = 0; // my_bss.2
  34 extern const int j;
  35 const int j = 4; // default - .rodata
  36 int k; // my_bss.2
  37 extern int zoo(int *x, int *y);
  38 int goo(void) {  // my_text.2
  39   static int lstat_h;  // my_bss.2
  40   return zoo(g, &lstat_h);
  41 }
  42 #ifdef __MACH__
  43 #pragma clang section rodata = "__RODATA,__myrodata2" data = "__DATA,__mydata2" relro = "__RELRO,__myrelro2"
  44 #else
  45 #pragma clang section rodata="my_rodata.2" data="my_data.2" relro="my_relro.2"
  46 #endif
  47 int l = 5; // my_data.2
  48 extern const int m;
  49 const int m = 6; // my_rodata.2
  50
  51 typedef int (*fptr_t)(void);
  52 const fptr_t fptrs[2] = {&foo, &goo};
  53 #pragma clang section rodata="" data="" bss="" text=""
  54 int n; // default
  55 int o = 6; // default
  56 extern const int p;
  57 const int p = 7; // default
  58 int hoo(void) {
  59   return b + fptrs[f]();
  60 }
  61 }
  62 //CHECK: @a ={{.*}} global i32 0, align 4 #0
  63 //CHECK: @b ={{.*}} global i32 1, align 4 #0
  64 //CHECK: @c ={{.*}} global [4 x i32] zeroinitializer, align 4 #0
  65 //CHECK: @d ={{.*}} global [5 x i16] zeroinitializer, align 2 #0
  66 //CHECK: @e ={{.*}} global [6 x i16] [i16 0, i16 0, i16 1, i16 0, i16 0, i16 0], align 2 #0
  67 //CHECK: @f ={{.*}} constant i32 2, align 4 #0
  68
  69 //CHECK: @h ={{.*}} global i32 0, align 4 #1
  70 //CHECK: @i ={{.*}} global i32 0, align 4 #2
  71 //CHECK: @j ={{.*}} constant i32 4, align 4 #2
  72 //CHECK: @k ={{.*}} global i32 0, align 4 #2
  73 //CHECK: @_ZZ3gooE7lstat_h = internal global i32 0, align 4 #2
  74 //CHECK: @_ZL1g = internal global [2 x i32] zeroinitializer, align 4 #0
  75
  76 //CHECK: @l ={{.*}} global i32 5, align 4 #3
  77 //CHECK: @m ={{.*}} constant i32 6, align 4 #3
  78
  79 //CHECK: @n ={{.*}} global i32 0, align 4
  80 //CHECK: @o ={{.*}} global i32 6, align 4
  81 //CHECK: @p ={{.*}} constant i32 7, align 4
  82 //CHECK: @_ZL5fptrs = internal constant [2 x ptr] [ptr @foo, ptr @goo], align {{4|8}} #3
  83
  84 //CHECK: define{{.*}} i32 @foo() #5 {
  85 //CHECK: define{{.*}} i32 @goo() #6 {
  86 //CHECK: declare i32 @zoo(ptr noundef, ptr noundef) #7
  87 //CHECK: define{{.*}} i32 @hoo() #8 {
  88
  89 //ELF: attributes #0 = { "bss-section"="my_bss.1" "data-section"="my_data.1" "rodata-section"="my_rodata.1" }
  90 //ELF: attributes #1 = { "data-section"="my_data.1" "rodata-section"="my_rodata.1" }
  91 //ELF: attributes #2 = { "bss-section"="my_bss.2" "rodata-section"="my_rodata.1" }
  92 //ELF: attributes #3 = { "bss-section"="my_bss.2" "data-section"="my_data.2" "relro-section"="my_relro.2" "rodata-section"="my_rodata.2" }
  93 //ELF: attributes #4 = { "relro-section"="my_relro.2" }
  94 //ELF: attributes #5 = { {{.*"implicit-section-name"="my_text.1".*}} }
  95 //ELF: attributes #6 = { {{.*"implicit-section-name"="my_text.2".*}} }
  96 //MACHO: attributes #0 = { "bss-section"="__BSS,__mybss1" "data-section"="__DATA,__mydata1" "rodata-section"="__RODATA,__myrodata1" }
  97 //MACHO: attributes #1 = { "data-section"="__DATA,__mydata1" "rodata-section"="__RODATA,__myrodata1" }
  98 //MACHO: attributes #2 = { "bss-section"="__BSS,__mybss2" "rodata-section"="__RODATA,__myrodata1" }
  99 //MACHO: attributes #3 = { "bss-section"="__BSS,__mybss2" "data-section"="__DATA,__mydata2" "relro-section"="__RELRO,__myrelro2" "rodata-section"="__RODATA,__myrodata2" }
 100 //MACHO: attributes #4 = { "relro-section"="__RELRO,__myrelro2" }
 101 //MACHO: attributes #5 = { {{.*"implicit-section-name"="__TEXT,__mytext1".*}} }
 102 //MACHO: attributes #6 = { {{.*"implicit-section-name"="__TEXT,__mytext2".*}} }
 103 //CHECK-NOT: attributes #7 = { {{.*"implicit-section-name".*}} }
 104 //CHECK-NOT: attributes #8 = { {{.*"implicit-section-name".*}} }