[llvm] [llvm-jitlink] Add -show-jit-result option (PR #226149)

[Lang Hames via llvm-commits]

https://github.com/lhames created https://github.com/llvm/llvm-project/pull/226149

Add a -show-jit-result option that prints the int result of the JIT'd main / entry function to stdout as:

  JIT result: <return value>

This makes the result of the JIT'd main / entry function FileCheck-able, and distinguishable from an llvm-jitlink failure.

This will be used in upcoming ORC runtime tests.

Since we don't currently run code under llvm-jitlink in LLVM regression tests, this commit does not include an LLVM-side test.

>From fade5467c6f2bb874d3f8a23c8fea2ac9a7dde14 Mon Sep 17 00:00:00 2001
From: Lang Hames <lhames at gmail.com>
Date: Thu, 24 Sep 2026 22:35:46 +1000
Subject: [PATCH] [llvm-jitlink] Add -show-jit-result option

Add a -show-jit-result option that prints the int result of the JIT'd
main / entry function to stdout as:

  JIT result: <return value>

This makes the result of the JIT'd main / entry function FileCheck-able,
and distinguishable from an llvm-jitlink failure.

This will be used in upcoming ORC runtime tests.

Since we don't currently run code under llvm-jitlink in LLVM regression
tests, this commit does not include an LLVM-side test.
---
 llvm/tools/llvm-jitlink/llvm-jitlink.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/llvm/tools/llvm-jitlink/llvm-jitlink.cpp b/llvm/tools/llvm-jitlink/llvm-jitlink.cpp
index 1160167c1cdad..22382d855b9ae 100644
--- a/llvm/tools/llvm-jitlink/llvm-jitlink.cpp
+++ b/llvm/tools/llvm-jitlink/llvm-jitlink.cpp
@@ -195,6 +195,11 @@ static cl::opt<std::string>
     CheckName("check-name", cl::desc("Name of checks to match against"),
               cl::init("jitlink-check"), cl::cat(JITLinkCategory));
 
+static cl::opt<bool>
+    ShowJITResult("show-jit-result",
+                  cl::desc("Print result of JIT'd main/entry to stdout"),
+                  cl::init(false), cl::cat(JITLinkCategory));
+
 static cl::opt<std::string>
     EntryPointName("entry", cl::desc("Symbol to call as main entry point"),
                    cl::init(""), cl::cat(JITLinkCategory));
@@ -3166,6 +3171,8 @@ int main(int argc, char *argv[]) {
       Result = ExitOnErr(runWithRuntime(*S, EntryPoint->getAddress()));
     else
       Result = ExitOnErr(runWithoutRuntime(*S, EntryPoint->getAddress()));
+    if (ShowJITResult)
+      outs() << "JIT result: " << Result << "\n";
   }
 
   // Destroy the session.