| //===- GenerateCode.cpp - Functions for generating executable files ------===// |
| // |
| // 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. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains functions for generating executable files once linking |
| // has finished. This includes generating a shell script to run the JIT or |
| // a native executable derived from the bytecode. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "gccld.h" |
| #include "llvm/Module.h" |
| #include "llvm/PassManager.h" |
| #include "llvm/Analysis/LoadValueNumbering.h" |
| #include "llvm/Bytecode/WriteBytecodePass.h" |
| #include "llvm/Target/TargetData.h" |
| #include "llvm/Transforms/IPO.h" |
| #include "llvm/Transforms/Scalar.h" |
| #include "llvm/Transforms/Utils/Linker.h" |
| #include "Support/SystemUtils.h" |
| #include "Support/CommandLine.h" |
| |
| using namespace llvm; |
| |
| namespace { |
| cl::opt<bool> |
| DisableInline("disable-inlining", cl::desc("Do not run the inliner pass")); |
| } |
| |
| namespace llvm { |
| |
| /// GenerateBytecode - generates a bytecode file from the specified module. |
| /// |
| /// Inputs: |
| /// M - The module for which bytecode should be generated. |
| /// Strip - Flags whether symbols should be stripped from the output. |
| /// Internalize - Flags whether all symbols should be marked internal. |
| /// Out - Pointer to file stream to which to write the output. |
| /// |
| /// Outputs: |
| /// None. |
| /// |
| /// Returns non-zero value on error. |
| /// |
| int |
| GenerateBytecode (Module *M, bool Strip, bool Internalize, std::ostream *Out) { |
| // In addition to just linking the input from GCC, we also want to spiff it up |
| // a little bit. Do this now. |
| PassManager Passes; |
| |
| // Add an appropriate TargetData instance for this module... |
| Passes.add(new TargetData("gccld", M)); |
| |
| // Linking modules together can lead to duplicated global constants, only keep |
| // one copy of each constant... |
| Passes.add(createConstantMergePass()); |
| |
| // If the -s command line option was specified, strip the symbols out of the |
| // resulting program to make it smaller. -s is a GCC option that we are |
| // supporting. |
| if (Strip) |
| Passes.add(createSymbolStrippingPass()); |
| |
| // Often if the programmer does not specify proper prototypes for the |
| // functions they are calling, they end up calling a vararg version of the |
| // function that does not get a body filled in (the real function has typed |
| // arguments). This pass merges the two functions. |
| Passes.add(createFunctionResolvingPass()); |
| |
| if (Internalize) { |
| // Now that composite has been compiled, scan through the module, looking |
| // for a main function. If main is defined, mark all other functions |
| // internal. |
| Passes.add(createInternalizePass()); |
| } |
| |
| // Propagate constants at call sites into the functions they call. |
| Passes.add(createIPConstantPropagationPass()); |
| |
| // Remove unused arguments from functions... |
| Passes.add(createDeadArgEliminationPass()); |
| |
| if (!DisableInline) |
| Passes.add(createFunctionInliningPass()); // Inline small functions |
| |
| // Run a few AA driven optimizations here and now, to cleanup the code. |
| // Eventually we should put an IP AA in place here. |
| |
| Passes.add(createLICMPass()); // Hoist loop invariants |
| Passes.add(createLoadValueNumberingPass()); // GVN for load instructions |
| Passes.add(createGCSEPass()); // Remove common subexprs |
| |
| // The FuncResolve pass may leave cruft around if functions were prototyped |
| // differently than they were defined. Remove this cruft. |
| Passes.add(createInstructionCombiningPass()); |
| |
| // Delete basic blocks, which optimization passes may have killed... |
| Passes.add(createCFGSimplificationPass()); |
| |
| // Now that we have optimized the program, discard unreachable functions... |
| Passes.add(createGlobalDCEPass()); |
| |
| // Add the pass that writes bytecode to the output file... |
| Passes.add(new WriteBytecodePass(Out)); |
| |
| // Run our queue of passes all at once now, efficiently. |
| Passes.run(*M); |
| |
| return 0; |
| } |
| |
| /// GenerateAssembly - generates a native assembly language source file from the |
| /// specified bytecode file. |
| /// |
| /// Inputs: |
| /// InputFilename - The name of the output bytecode file. |
| /// OutputFilename - The name of the file to generate. |
| /// llc - The pathname to use for LLC. |
| /// envp - The environment to use when running LLC. |
| /// |
| /// Outputs: |
| /// None. |
| /// |
| /// Return non-zero value on error. |
| /// |
| int |
| GenerateAssembly(const std::string &OutputFilename, |
| const std::string &InputFilename, |
| const std::string &llc, |
| char ** const envp) |
| { |
| // Run LLC to convert the bytecode file into assembly code. |
| const char *cmd[8]; |
| |
| cmd[0] = llc.c_str(); |
| cmd[1] = "-f"; |
| cmd[2] = "-o"; |
| cmd[3] = OutputFilename.c_str(); |
| cmd[4] = InputFilename.c_str(); |
| cmd[5] = NULL; |
| |
| return ExecWait(cmd, envp); |
| } |
| |
| /// GenerateNative - generates a native assembly language source file from the |
| /// specified assembly source file. |
| /// |
| /// Inputs: |
| /// InputFilename - The name of the output bytecode file. |
| /// OutputFilename - The name of the file to generate. |
| /// Libraries - The list of libraries with which to link. |
| /// LibPaths - The list of directories in which to find libraries. |
| /// gcc - The pathname to use for GGC. |
| /// envp - A copy of the process's current environment. |
| /// |
| /// Outputs: |
| /// None. |
| /// |
| /// Returns non-zero value on error. |
| /// |
| int |
| GenerateNative(const std::string &OutputFilename, |
| const std::string &InputFilename, |
| const std::vector<std::string> &Libraries, |
| const std::vector<std::string> &LibPaths, |
| const std::string &gcc, |
| char ** const envp) { |
| // Remove these environment variables from the environment of the |
| // programs that we will execute. It appears that GCC sets these |
| // environment variables so that the programs it uses can configure |
| // themselves identically. |
| // |
| // However, when we invoke GCC below, we want it to use its normal |
| // configuration. Hence, we must sanitize its environment. |
| char ** clean_env = CopyEnv(envp); |
| if (clean_env == NULL) |
| return 1; |
| RemoveEnv("LIBRARY_PATH", clean_env); |
| RemoveEnv("COLLECT_GCC_OPTIONS", clean_env); |
| RemoveEnv("GCC_EXEC_PREFIX", clean_env); |
| RemoveEnv("COMPILER_PATH", clean_env); |
| RemoveEnv("COLLECT_GCC", clean_env); |
| |
| std::vector<const char *> cmd; |
| |
| // Run GCC to assemble and link the program into native code. |
| // |
| // Note: |
| // We can't just assemble and link the file with the system assembler |
| // and linker because we don't know where to put the _start symbol. |
| // GCC mysteriously knows how to do it. |
| cmd.push_back(gcc.c_str()); |
| cmd.push_back("-o"); |
| cmd.push_back(OutputFilename.c_str()); |
| cmd.push_back(InputFilename.c_str()); |
| |
| // Adding the library paths creates a problem for native generation. If we |
| // include the search paths from llvmgcc, then we'll be telling normal gcc |
| // to look inside of llvmgcc's library directories for libraries. This is |
| // bad because those libraries hold only bytecode files (not native object |
| // files). In the end, we attempt to link the bytecode libgcc into a native |
| // program. |
| #if 0 |
| // Add in the library path options. |
| for (unsigned index=0; index < LibPaths.size(); index++) { |
| cmd.push_back("-L"); |
| cmd.push_back(LibPaths[index].c_str()); |
| } |
| #endif |
| |
| // Add in the libraries to link. |
| std::vector<std::string> Libs(Libraries); |
| for (unsigned index = 0; index < Libs.size(); index++) { |
| Libs[index] = "-l" + Libs[index]; |
| cmd.push_back(Libs[index].c_str()); |
| } |
| cmd.push_back(NULL); |
| |
| // Run the compiler to assembly and link together the program. |
| return ExecWait(&(cmd[0]), clean_env); |
| } |
| |
| } // End llvm namespace |