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Extend TargetPassConfig to allow running only a subset of the normal passes.

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This is still a work in progress but I believe it is currently good enough
to fix PR13122 "Need unit test driver for codegen IR passes".  For example,
you can run llc with -stop-after=loop-reduce to have it dump out the IR after
running LSR.  Serializing machine-level IR is not yet supported but we have
some patches in progress for that.

The plan is to serialize the IR to a YAML file, containing separate sections
for the LLVM IR, machine-level IR, and whatever other info is needed.  Chad
suggested that we stash the stop-after pass in the YAML file and use that
instead of the start-after option to figure out where to restart the
compilation.  I think that's a great idea, but since it's not implemented yet
I put the -start-after option into this patch for testing purposes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159570 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2012-07-02 19:48:45 +00:00
parent 6b2bb15bf7
commit 30a507a1f5
9 changed files with 118 additions and 23 deletions
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44
tools/llc/llc.cpp
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@@ -18,6 +18,7 @@
#include "llvm/PassManager.h"
#include "llvm/Pass.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Support/IRReader.h"
#include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
#include "llvm/CodeGen/LinkAllCodegenComponents.h"
@@ -257,6 +258,15 @@ UseInitArray("use-init-array",
cl::desc("Use .init_array instead of .ctors."),
cl::init(false));
static cl::opt<std::string> StopAfter("stop-after",
cl::desc("Stop compilation after a specific pass"),
cl::value_desc("pass-name"),
cl::init(""));
static cl::opt<std::string> StartAfter("start-after",
cl::desc("Resume compilation after a specific pass"),
cl::value_desc("pass-name"),
cl::init(""));
// GetFileNameRoot - Helper function to get the basename of a filename.
static inline std::string
GetFileNameRoot(const std::string &InputFilename) {
@@ -353,9 +363,14 @@ int main(int argc, char **argv) {
InitializeAllAsmPrinters();
InitializeAllAsmParsers();
// Initialize codegen so that the -print-after and -print-before options
// work.
initializeCodeGen(*PassRegistry::getPassRegistry());
// Initialize codegen and IR passes used by llc so that the -print-after,
// -print-before, and -stop-after options work.
PassRegistry *Registry = PassRegistry::getPassRegistry();
initializeCore(*Registry);
initializeCodeGen(*Registry);
initializeLoopStrengthReducePass(*Registry);
initializeLowerIntrinsicsPass(*Registry);
initializeUnreachableBlockElimPass(*Registry);
// Register the target printer for --version.
cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
@@ -498,8 +513,29 @@ int main(int argc, char **argv) {
{
formatted_raw_ostream FOS(Out->os());
AnalysisID StartAfterID = 0;
AnalysisID StopAfterID = 0;
const PassRegistry *PR = PassRegistry::getPassRegistry();
if (!StartAfter.empty()) {
const PassInfo *PI = PR->getPassInfo(StartAfter);
if (!PI) {
errs() << argv[0] << ": start-after pass is not registered.\n";
return 1;
}
StartAfterID = PI->getTypeInfo();
}
if (!StopAfter.empty()) {
const PassInfo *PI = PR->getPassInfo(StopAfter);
if (!PI) {
errs() << argv[0] << ": stop-after pass is not registered.\n";
return 1;
}
StopAfterID = PI->getTypeInfo();
}
// Ask the target to add backend passes as necessary.
if (Target.addPassesToEmitFile(PM, FOS, FileType, NoVerify)) {
if (Target.addPassesToEmitFile(PM, FOS, FileType, NoVerify,
StartAfterID, StopAfterID)) {
errs() << argv[0] << ": target does not support generation of this"
<< " file type!\n";
return 1;