Add flag to lli to enable debugging of IR when used with MCJIT.
- warn users when -debug-ir is used with old JIT engine (only partial debug
info is available)
For example, to debug an IR file with GDB (that supports JIT registration), do:
$ gdb --args lli -use-mcjit -debug-ir testcase.ll
(gdb) break main
(gdb) run
<Process continues to lli main>
(gdb) continue
<Process continues to testcase.ll main()
(gdb) step
<Now stepping through the LLVM IR in testcase.ll>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185197 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/lli/lli.cpp b/tools/lli/lli.cpp
index 031f945..8d74b23 100644
--- a/tools/lli/lli.cpp
+++ b/tools/lli/lli.cpp
@@ -45,6 +45,7 @@
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
+#include "llvm/Transforms/Instrumentation.h"
#include <cerrno>
#ifdef __CYGWIN__
@@ -71,6 +72,10 @@
"use-mcjit", cl::desc("Enable use of the MC-based JIT (if available)"),
cl::init(false));
+ cl::opt<bool> DebugIR(
+ "debug-ir", cl::desc("Generate debug information to allow debugging IR."),
+ cl::init(false));
+
// The MCJIT supports building for a target address space separate from
// the JIT compilation process. Use a forked process and a copying
// memory manager with IPC to execute using this functionality.
@@ -321,6 +326,17 @@
}
}
+ if (DebugIR) {
+ if (!UseMCJIT) {
+ errs() << "warning: -debug-ir used without -use-mcjit. Only partial debug"
+ << " information will be emitted by the non-MC JIT engine. To see full"
+ << " source debug information, enable the flag '-use-mcjit'.\n";
+
+ }
+ ModulePass *DebugIRPass = createDebugIRPass();
+ DebugIRPass->runOnModule(*Mod);
+ }
+
EngineBuilder builder(Mod);
builder.setMArch(MArch);
builder.setMCPU(MCPU);