1 /* 2 * This file is used to test dsymutil support for call site entries with tail 3 * calls (DW_AT_call_pc). 4 * 5 * Instructions for regenerating binaries (on Darwin/x86_64): 6 * 7 * 1. Copy the source to a top-level directory to work around having absolute 8 * paths in the symtab's OSO entries. 9 * 10 * mkdir -p /Inputs/ && cp tail-call.c /Inputs && cd /Inputs 11 * 12 * 2. Compile with call site info enabled. -O2 is used to get tail call 13 * promotion. 14 * 15 * clang -g -O2 tail-call.c -c -o tail-call.macho.x86_64.o 16 * clang tail-call.macho.x86_64.o -o tail-call.macho.x86_64 17 * 18 * 3. Copy the binaries back into the repo's Inputs directory. You'll need 19 * -oso-prepend-path=%p to link. 20 */ 21 22 volatile int x; 23 func2()24__attribute__((disable_tail_calls, noinline)) void func2() { x++; } 25 func1()26__attribute__((noinline)) void func1() { func2(); /* tail */ } 27 main()28__attribute__((disable_tail_calls)) int main() { func1(); /* regular */ } 29