[bugpoint] Report non-existent opt binary

Bugpoint will keep going even if the opt binary it's given doesn't
exist. It should at least alert the user, so it's clear why reductions
are failing.

llvm-svn: 324713

diff --git a/llvm/test/BugPoint/unsymbolized.ll b/llvm/test/BugPoint/unsymbolized.ll
index 8547f22..ae47682 100644 (file)
--- a/llvm/test/BugPoint/unsymbolized.ll
+++ b/llvm/test/BugPoint/unsymbolized.ll
@@ -4,6 +4,7 @@
 ; RUN: echo "exit(1)" >> %t.py
 ; RUN: not bugpoint -load %llvmshlibdir/BugpointPasses%shlibext %s -output-prefix %t -bugpoint-crashcalls -opt-command="%python" -opt-args %t.py | FileCheck %s
 ; RUN: not --crash opt -load %llvmshlibdir/BugpointPasses%shlibext %s -bugpoint-crashcalls -disable-symbolication 2>&1 | FileCheck --check-prefix=CRASH %s
+; RUN: not bugpoint -load %llvmshlibdir/BugpointPasses%shlibext %s -output-prefix %t -bugpoint-crashcalls -opt-command=%t.non.existent.opt.binary -opt-args %t.py 2>&1 | FileCheck %s --check-prefix=BAD-OPT
 
 ; Test that bugpoint disables symbolication on the opt tool to reduce runtime overhead when opt crashes
 ; CHECK: args = {{.*}}'-disable-symbolication'
@@ -15,6 +16,7 @@
 ; now.
 ; CRASH-NOT: Signals.inc
 
+; BAD-OPT: Specified `opt' binary does not exist: {{.*}}non.existent.opt.binary
 define void @f() {
   call void @f()
   ret void

diff --git a/llvm/tools/bugpoint/OptimizerDriver.cpp b/llvm/tools/bugpoint/OptimizerDriver.cpp
index fd4b498..6fd6317 100644 (file)
--- a/llvm/tools/bugpoint/OptimizerDriver.cpp
+++ b/llvm/tools/bugpoint/OptimizerDriver.cpp
@@ -177,6 +177,10 @@ bool BugDriver::runPasses(Module *Program,
     errs() << "Cannot find `opt' in PATH!\n";
     return 1;
   }
+  if (!sys::fs::exists(tool)) {
+    errs() << "Specified `opt' binary does not exist: " << tool << "\n";
+    return 1;
+  }
 
   std::string Prog;
   if (UseValgrind) {