+//===-- gccas.cpp - The "optimizing assembler" used by the GCC frontend ---===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
-// LLVM 'GCCAS' UTILITY
//
-// This utility is designed to be used by the GCC frontend for creating
-// bytecode files from it's intermediate llvm assembly. The requirements for
-// this utility are thus slightly different than that of the standard as util.
+// This utility is designed to be used by the GCC frontend for creating bytecode
+// files from its intermediate LLVM assembly. The requirements for this utility
+// are thus slightly different than that of the standard `as' util.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/PassManager.h"
+#include "llvm/Analysis/LoadValueNumbering.h"
+#include "llvm/Analysis/Verifier.h"
#include "llvm/Assembly/Parser.h"
-#include "llvm/Transforms/CleanupGCCOutput.h"
-#include "llvm/Transforms/LevelChange.h"
-#include "llvm/Transforms/ConstantMerge.h"
-#include "llvm/Transforms/ChangeAllocations.h"
-#include "llvm/Transforms/Scalar/ConstantProp.h"
-#include "llvm/Transforms/Scalar/DCE.h"
-#include "llvm/Transforms/Scalar/GCSE.h"
-#include "llvm/Transforms/Scalar/IndVarSimplify.h"
-#include "llvm/Transforms/Scalar/InstructionCombining.h"
-#include "llvm/Transforms/Scalar/PromoteMemoryToRegister.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/Scalar.h"
#include "Support/CommandLine.h"
#include "Support/Signals.h"
#include <memory>
#include <fstream>
-cl::String InputFilename ("", "Parse <arg> file, compile to bytecode",
- cl::Required, "");
-cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "");
-cl::Flag StopAtLevelRaise("stopraise", "Stop optimization before level raise",
- cl::Hidden);
+using namespace llvm;
+
+namespace {
+ cl::opt<std::string>
+ InputFilename(cl::Positional,cl::desc("<input llvm assembly>"),cl::init("-"));
+
+ cl::opt<std::string>
+ OutputFilename("o", cl::desc("Override output filename"),
+ cl::value_desc("filename"));
+
+ cl::opt<bool>
+ Verify("verify", cl::desc("Verify each pass result"));
+
+ cl::opt<bool>
+ DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
+
+ cl::opt<bool>
+ DisableOptimizations("disable-opt",
+ cl::desc("Do not run any optimization passes"));
+}
+
+
+static inline void addPass(PassManager &PM, Pass *P) {
+ // Add the pass to the pass manager...
+ PM.add(P);
+
+ // If we are verifying all of the intermediate steps, add the verifier...
+ if (Verify) PM.add(createVerifierPass());
+}
+
+
+void AddConfiguredTransformationPasses(PassManager &PM) {
+ PM.add(createVerifierPass()); // Verify that input is correct
+ addPass(PM, createLowerSetJmpPass()); // Lower llvm.setjmp/.longjmp
+ addPass(PM, createFunctionResolvingPass()); // Resolve (...) functions
+
+ if (DisableOptimizations) return;
+
+ addPass(PM, createRaiseAllocationsPass()); // call %malloc -> malloc inst
+ addPass(PM, createCFGSimplificationPass()); // Clean up disgusting code
+ addPass(PM, createPromoteMemoryToRegister()); // Kill useless allocas
+ addPass(PM, createGlobalConstifierPass()); // Mark read-only globals const
+ addPass(PM, createGlobalDCEPass()); // Remove unused globals
+ addPass(PM, createIPConstantPropagationPass());// IP Constant Propagation
+ addPass(PM, createDeadArgEliminationPass()); // Dead argument elimination
+ addPass(PM, createInstructionCombiningPass()); // Clean up after IPCP & DAE
+ addPass(PM, createCFGSimplificationPass()); // Clean up after IPCP & DAE
+
+ addPass(PM, createPruneEHPass()); // Remove dead EH info
+
+ if (!DisableInline)
+ addPass(PM, createFunctionInliningPass()); // Inline small functions
+ addPass(PM, createArgumentPromotionPass()); // Scalarize uninlined fn args
+
+ addPass(PM, createRaisePointerReferencesPass());// Recover type information
+ addPass(PM, createTailDuplicationPass()); // Simplify cfg by copying code
+ addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
+ addPass(PM, createScalarReplAggregatesPass()); // Break up aggregate allocas
+ addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
+
+ addPass(PM, createReassociatePass()); // Reassociate expressions
+ addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
+ addPass(PM, createTailCallEliminationPass()); // Eliminate tail calls
+ addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
+ addPass(PM, createLICMPass()); // Hoist loop invariants
+ addPass(PM, createLoadValueNumberingPass()); // GVN for load instructions
+ addPass(PM, createGCSEPass()); // Remove common subexprs
+ addPass(PM, createSCCPPass()); // Constant prop with SCCP
+
+ // Run instcombine after redundancy elimination to exploit opportunities
+ // opened up by them.
+ addPass(PM, createInstructionCombiningPass());
+ addPass(PM, createIndVarSimplifyPass()); // Canonicalize indvars
+ addPass(PM, createAggressiveDCEPass()); // SSA based 'Aggressive DCE'
+ addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
+ addPass(PM, createDeadTypeEliminationPass()); // Eliminate dead types
+ addPass(PM, createConstantMergePass()); // Merge dup global constants
+}
+
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm .s -> .o assembler for GCC\n");
+ PrintStackTraceOnErrorSignal();
std::auto_ptr<Module> M;
try {
// Parse the file now...
M.reset(ParseAssemblyFile(InputFilename));
} catch (const ParseException &E) {
- cerr << E.getMessage() << endl;
+ std::cerr << argv[0] << ": " << E.getMessage() << "\n";
return 1;
}
if (M.get() == 0) {
- cerr << "assembly didn't read correctly.\n";
+ std::cerr << argv[0] << ": assembly didn't read correctly.\n";
return 1;
}
-
+
+ std::ostream *Out = 0;
if (OutputFilename == "") { // Didn't specify an output filename?
- std::string IFN = InputFilename;
- int Len = IFN.length();
- if (IFN[Len-2] == '.' && IFN[Len-1] == 's') { // Source ends in .s?
- OutputFilename = std::string(IFN.begin(), IFN.end()-2);
+ if (InputFilename == "-") {
+ OutputFilename = "-";
} else {
- OutputFilename = IFN; // Append a .o to it
+ std::string IFN = InputFilename;
+ int Len = IFN.length();
+ if (IFN[Len-2] == '.' && IFN[Len-1] == 's') { // Source ends in .s?
+ OutputFilename = std::string(IFN.begin(), IFN.end()-2);
+ } else {
+ OutputFilename = IFN; // Append a .o to it
+ }
+ OutputFilename += ".o";
}
- OutputFilename += ".o";
}
- std::ofstream Out(OutputFilename.c_str(), ios::out);
- if (!Out.good()) {
- cerr << "Error opening " << OutputFilename << "!\n";
- return 1;
+ if (OutputFilename == "-")
+ Out = &std::cout;
+ else {
+ Out = new std::ofstream(OutputFilename.c_str(), std::ios::out);
+
+ // Make sure that the Out file gets unlinked from the disk if we get a
+ // signal
+ RemoveFileOnSignal(OutputFilename);
}
- // Make sure that the Out file gets unlink'd from the disk if we get a SIGINT
- RemoveFileOnSignal(OutputFilename);
+
+ if (!Out->good()) {
+ std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
+ return 1;
+ }
// In addition to just parsing the input from GCC, we also want to spiff it up
// a little bit. Do this now.
//
PassManager Passes;
- Passes.add(createFunctionResolvingPass()); // Resolve (...) functions
- Passes.add(createConstantMergePass()); // Merge dup global constants
- Passes.add(createDeadInstEliminationPass()); // Remove Dead code/vars
- Passes.add(createRaiseAllocationsPass()); // call %malloc -> malloc inst
- Passes.add(createCleanupGCCOutputPass()); // Fix gccisms
- Passes.add(createIndVarSimplifyPass()); // Simplify indvars
- if (!StopAtLevelRaise) {
- Passes.add(createRaisePointerReferencesPass()); // Eliminate casts
- Passes.add(createPromoteMemoryToRegister()); // Promote alloca's to regs
- Passes.add(createInstructionCombiningPass()); // Combine silly seq's
- Passes.add(createDeadCodeEliminationPass()); // Remove Dead code/vars
- Passes.add(createSCCPPass()); // Constant prop with SCCP
- Passes.add(createGCSEPass()); // Remove common subexprs
- }
- Passes.add(new WriteBytecodePass(&Out)); // Write bytecode to file...
+
+ // Add an appropriate TargetData instance for this module...
+ Passes.add(new TargetData("gccas", M.get()));
+
+ // Add all of the transformation passes to the pass manager to do the cleanup
+ // and optimization of the GCC output.
+ //
+ AddConfiguredTransformationPasses(Passes);
+
+ // Make sure everything is still good.
+ Passes.add(createVerifierPass());
+
+ // Write bytecode to file...
+ Passes.add(new WriteBytecodePass(Out));
// Run our queue of passes all at once now, efficiently.
- Passes.run(M.get());
+ Passes.run(*M.get());
+
+ if (Out != &std::cout) delete Out;
return 0;
}
-
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