[compiler-rt] [compiler-rt] Fix format string warnings in FreeBSD DumpAllRegisters (PR #101072)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: Dimitry Andric (DimitryAndric)

<details>
<summary>Changes</summary>

On FreeBSD amd64 (aka x86_64), registers are always defined as `int64_t`, which in turn is equivalent to `long`. This leads to a number of warnings in `DumpAllRegisters()`:

    compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp:2245:31: warning: format specifies type 'unsigned long long' but the argument has type '__register_t' (aka 'long') [-Wformat]
     2245 |   Printf("rax = 0x%016llx  ", ucontext->uc_mcontext.mc_rax);
          |                   ~~~~~~~     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
          |                   %016lx
    compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp:2246:31: warning: format specifies type 'unsigned long long' but the argument has type '__register_t' (aka 'long') [-Wformat]
     2246 |   Printf("rbx = 0x%016llx  ", ucontext->uc_mcontext.mc_rbx);
          |                   ~~~~~~~     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
          |                   %016lx
    ... more of these ...

Fix it by using the `lx` format.

---
Full diff: https://github.com/llvm/llvm-project/pull/101072.diff


1 Files Affected:

- (modified) compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp (+16-16) 


``````````diff
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
index 2ea61b1cb424c..7b73c3576fd35 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
@@ -2386,25 +2386,25 @@ void SignalContext::DumpAllRegisters(void *context) {
 #  elif SANITIZER_FREEBSD
 #    if defined(__x86_64__)
   Report("Register values:\n");
-  Printf("rax = 0x%016llx  ", ucontext->uc_mcontext.mc_rax);
-  Printf("rbx = 0x%016llx  ", ucontext->uc_mcontext.mc_rbx);
-  Printf("rcx = 0x%016llx  ", ucontext->uc_mcontext.mc_rcx);
-  Printf("rdx = 0x%016llx  ", ucontext->uc_mcontext.mc_rdx);
+  Printf("rax = 0x%016lx  ", ucontext->uc_mcontext.mc_rax);
+  Printf("rbx = 0x%016lx  ", ucontext->uc_mcontext.mc_rbx);
+  Printf("rcx = 0x%016lx  ", ucontext->uc_mcontext.mc_rcx);
+  Printf("rdx = 0x%016lx  ", ucontext->uc_mcontext.mc_rdx);
   Printf("\n");
-  Printf("rdi = 0x%016llx  ", ucontext->uc_mcontext.mc_rdi);
-  Printf("rsi = 0x%016llx  ", ucontext->uc_mcontext.mc_rsi);
-  Printf("rbp = 0x%016llx  ", ucontext->uc_mcontext.mc_rbp);
-  Printf("rsp = 0x%016llx  ", ucontext->uc_mcontext.mc_rsp);
+  Printf("rdi = 0x%016lx  ", ucontext->uc_mcontext.mc_rdi);
+  Printf("rsi = 0x%016lx  ", ucontext->uc_mcontext.mc_rsi);
+  Printf("rbp = 0x%016lx  ", ucontext->uc_mcontext.mc_rbp);
+  Printf("rsp = 0x%016lx  ", ucontext->uc_mcontext.mc_rsp);
   Printf("\n");
-  Printf(" r8 = 0x%016llx  ", ucontext->uc_mcontext.mc_r8);
-  Printf(" r9 = 0x%016llx  ", ucontext->uc_mcontext.mc_r9);
-  Printf("r10 = 0x%016llx  ", ucontext->uc_mcontext.mc_r10);
-  Printf("r11 = 0x%016llx  ", ucontext->uc_mcontext.mc_r11);
+  Printf(" r8 = 0x%016lx  ", ucontext->uc_mcontext.mc_r8);
+  Printf(" r9 = 0x%016lx  ", ucontext->uc_mcontext.mc_r9);
+  Printf("r10 = 0x%016lx  ", ucontext->uc_mcontext.mc_r10);
+  Printf("r11 = 0x%016lx  ", ucontext->uc_mcontext.mc_r11);
   Printf("\n");
-  Printf("r12 = 0x%016llx  ", ucontext->uc_mcontext.mc_r12);
-  Printf("r13 = 0x%016llx  ", ucontext->uc_mcontext.mc_r13);
-  Printf("r14 = 0x%016llx  ", ucontext->uc_mcontext.mc_r14);
-  Printf("r15 = 0x%016llx  ", ucontext->uc_mcontext.mc_r15);
+  Printf("r12 = 0x%016lx  ", ucontext->uc_mcontext.mc_r12);
+  Printf("r13 = 0x%016lx  ", ucontext->uc_mcontext.mc_r13);
+  Printf("r14 = 0x%016lx  ", ucontext->uc_mcontext.mc_r14);
+  Printf("r15 = 0x%016lx  ", ucontext->uc_mcontext.mc_r15);
   Printf("\n");
 #    elif defined(__i386__)
   Report("Register values:\n");

``````````

</details>


https://github.com/llvm/llvm-project/pull/101072