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Add flag to lli to enable debugging of IR when used with MCJIT.

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- 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>

llvm-svn: 185197
This commit is contained in:
Daniel Malea 2013-06-28 19:11:40 +00:00
parent 14f612b9cf
commit b47853a3be
4 changed files with 19 additions and 3 deletions
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2
tools/lli/CMakeLists.txt
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@ -1,5 +1,5 @@
set(LLVM_LINK_COMPONENTS mcjit jit interpreter nativecodegen bitreader asmparser irreader selectiondag native)
set(LLVM_LINK_COMPONENTS mcjit jit interpreter nativecodegen bitreader asmparser irreader selectiondag native instrumentation)
if( LLVM_USE_OPROFILE )
set(LLVM_LINK_COMPONENTS

2
tools/lli/LLVMBuild.txt
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@ -19,4 +19,4 @@
type = Tool
name = lli
parent = Tools
required_libraries = AsmParser BitReader IRReader Interpreter JIT MCJIT NativeCodeGen SelectionDAG Native
required_libraries = AsmParser BitReader IRReader Instrumentation Interpreter JIT MCJIT NativeCodeGen SelectionDAG Native

2
tools/lli/Makefile
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@ -12,7 +12,7 @@ TOOLNAME := lli
include $(LEVEL)/Makefile.config
LINK_COMPONENTS := mcjit jit interpreter nativecodegen bitreader asmparser irreader selectiondag native
LINK_COMPONENTS := mcjit jit instrumentation interpreter nativecodegen bitreader asmparser irreader selectiondag native
# If Intel JIT Events support is confiured, link against the LLVM Intel JIT
# Events interface library

16
tools/lli/lli.cpp
View File

@ -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 @@ namespace {
"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 @@ int main(int argc, char **argv, char * const *envp) {
}
}
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);