testing/test-cases/lazy-symbol-missing.dtest/main.c

   1 // note: -Os is needed for armv7 to work around compiler issue where at -O0 it computes pointer to function and calls that
   2
   3 // BUILD:  $CC foo.c -dynamiclib -o $BUILD_DIR/libfoo.dylib         -install_name $RUN_DIR/libfoo.dylib
   4 // BUILD:  $CC foo.c -dynamiclib -o $BUILD_DIR/libfoo-present.dylib  -install_name $RUN_DIR/libfoo.dylib -DHAS_SYMBOL=1
   5 // BUILD:  $CC foo.c -dynamiclib -o $BUILD_DIR/libbar-missing.dylib  -install_name $RUN_DIR/libbar-missing.dylib -DHAS_SYMBOL=1
   6 // BUILD:  $CC main.c            -o $BUILD_DIR/lazy-symbol-missing.exe        $BUILD_DIR/libfoo-present.dylib -Os
   7 // BUILD:  $CC main.c            -o $BUILD_DIR/lazy-symbol-missing-flat.exe   -undefined dynamic_lookup      -Os -DFLAT=1
   8 // BUILD:  $CC main-call.c       -o $BUILD_DIR/lazy-symbol-missing-called.exe $BUILD_DIR/libfoo-present.dylib -Os
   9 // BUILD:  $CC main-call.c       -o $BUILD_DIR/lazy-symbol-missing-called-weak-lib.exe $BUILD_DIR/libbar-missing.dylib -Os -DWEAK=1
  10 // BUILD:  $CXX runner.cpp         -o $BUILD_DIR/lazy-symbol-runner.exe -DRUN_DIR="$RUN_DIR"
  11 // BUILD:  $CXX runner.cpp         -o $BUILD_DIR/lazy-symbol-runner-weak-lib.exe -DRUN_DIR="$RUN_DIR" -DWEAK=1
  12
  13 // BUILD: $SKIP_INSTALL $BUILD_DIR/libfoo-present.dylib
  14 // BUILD: $SKIP_INSTALL $BUILD_DIR/libbar-missing.dylib
  15
  16 // NO_CRASH_LOG: lazy-symbol-missing-called.exe
  17 // NO_CRASH_LOG: lazy-symbol-missing-called-weak-lib.exe
  18
  19 // RUN:  ./lazy-symbol-missing.exe
  20 // RUN:  ./lazy-symbol-runner.exe
  21 // RUN:  ./lazy-symbol-missing-flat.exe
  22 // RUN:  ./lazy-symbol-runner-weak-lib.exe
  23
  24
  25 #include <stdio.h>
  26 #include <stdbool.h>
  27 #include <mach-o/getsect.h>
  28
  29 #include "test_support.h"
  30
  31 #if __LP64__
  32 extern struct mach_header_64 __dso_handle;
  33 #else
  34 extern struct mach_header __dso_handle;
  35 #endif
  36
  37 extern int slipperySymbol();
  38
  39 #ifdef FLAT
  40   #define TESTNAME "lazy-symbol-missing-flat"
  41 #else
  42   #define TESTNAME "lazy-symbol-missing"
  43 #endif
  44
  45 int main(int argc, const char* argv[], const char* envp[], const char* apple[]) {
  46 #if __arm64e__
  47     // arm64e always uses chained binds which does not support lazy binding
  48     bool supportsLazyBinding = false;
  49 #else
  50     // other architectures may or may not use lazy binding
  51     unsigned long sectSize = 0;
  52     bool supportsLazyBinding = (getsectiondata(&__dso_handle, "__DATA", "__la_symbol_ptr", &sectSize) != NULL);
  53   #if __ARM_ARCH_7K__
  54     // armv7 has two names for lazy pointers section
  55     if ( !supportsLazyBinding )
  56         supportsLazyBinding = (getsectiondata(&__dso_handle, "__DATA", "__lazy_symbol", &sectSize) != NULL);
  57   #endif
  58 #endif
  59
  60     if ( supportsLazyBinding ) {
  61         // add runtime check that results in the function never being called
  62         if ( argc < 0 )
  63             slipperySymbol();
  64     }
  65     PASS("%s", TESTNAME);
  66 }
  67