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Add some switches helpful for debugging:

Browse Source 
-print-before=<Pass Name>

Dump IR before running pass <Pass Name>.

-print-before-all

Dump IR before running each pass.

-print-after-all

Dump IR after running each pass.

These are helpful when tracking down a miscompilation.  It is easy to
get IR dumps and do diffs on them, etc.

To make this work well, add a new getPrinterPass API to Pass so that
each kind of pass (ModulePass, FunctionPass, etc.) can create a Pass
suitable for dumping out the kind of object the Pass works on.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100143 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Greene
2010-04-01 22:43:57 +00:00
parent 3ea97550e3
commit 8ef3acba00
14 changed files with 282 additions and 42 deletions
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34
lib/CodeGen/MachineFunction.cpp
View File

@ -39,40 +39,6 @@
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
struct Printer : public MachineFunctionPass {
static char ID;
raw_ostream &OS;
const std::string Banner;
Printer(raw_ostream &os, const std::string &banner)
: MachineFunctionPass(&ID), OS(os), Banner(banner) {}
const char *getPassName() const { return "MachineFunction Printer"; }
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
MachineFunctionPass::getAnalysisUsage(AU);
}
bool runOnMachineFunction(MachineFunction &MF) {
OS << "# " << Banner << ":\n";
MF.print(OS);
return false;
}
};
char Printer::ID = 0;
}
/// Returns a newly-created MachineFunction Printer pass. The default banner is
/// empty.
///
FunctionPass *llvm::createMachineFunctionPrinterPass(raw_ostream &OS,
const std::string &Banner){
return new Printer(OS, Banner);
}
//===----------------------------------------------------------------------===//
// MachineFunction implementation
//===----------------------------------------------------------------------===//