-//===- genexec.cpp - Functions for generating executable files ------------===//
+//===- 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
//
//===----------------------------------------------------------------------===//
-#include "llvm/Transforms/Utils/Linker.h"
-#include "llvm/Transforms/IPO.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Target/TargetData.h"
+#include "gccld.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
+#include "llvm/Analysis/LoadValueNumbering.h"
+#include "llvm/Analysis/Verifier.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 "util.h"
+#include "Support/CommandLine.h"
-#include <fstream>
-#include <string>
-#include <vector>
+using namespace llvm;
-//
-// Function: GenerateBytecode ()
-//
-// Description:
-// This function 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.
-//
-// Return value:
-// 0 - No error.
-// 1 - Error.
-//
+namespace {
+ cl::opt<bool>
+ DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
+
+ cl::opt<bool>
+ Verify("verify", cl::desc("Verify intermediate results of all passes"));
+
+ cl::opt<bool>
+ DisableOptimizations("disable-opt",
+ cl::desc("Do not run any optimization passes"));
+}
+
+namespace llvm {
+
+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());
+}
+
+/// 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::ofstream * Out)
-{
+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 (Verify) Passes.add(createVerifierPass());
- // 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());
+ // Add an appropriate TargetData instance for this module...
+ addPass(Passes, new TargetData("gccld", M));
// 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());
- }
+ addPass(Passes, createFunctionResolvingPass());
- // Remove unused arguments from functions...
- //
- Passes.add(createDeadArgEliminationPass());
+ if (!DisableOptimizations) {
+ // Linking modules together can lead to duplicated global constants, only
+ // keep one copy of each constant...
+ addPass(Passes, createConstantMergePass());
- // The FuncResolve pass may leave cruft around if functions were prototyped
- // differently than they were defined. Remove this cruft.
- //
- Passes.add(createInstructionCombiningPass());
+ // 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)
+ addPass(Passes, createSymbolStrippingPass());
- // Delete basic blocks, which optimization passes may have killed...
- //
- Passes.add(createCFGSimplificationPass());
+ 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.
+ addPass(Passes, createInternalizePass());
+ }
- // Now that we have optimized the program, discard unreachable functions...
- //
- Passes.add(createGlobalDCEPass());
+ // Propagate constants at call sites into the functions they call.
+ addPass(Passes, createIPConstantPropagationPass());
+
+ // Remove unused arguments from functions...
+ addPass(Passes, createDeadArgEliminationPass());
+
+ if (!DisableInline)
+ addPass(Passes, 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.
+
+ addPass(Passes, createLICMPass()); // Hoist loop invariants
+ addPass(Passes, createLoadValueNumberingPass()); // GVN for load instrs
+ addPass(Passes, createGCSEPass()); // Remove common subexprs
+
+ // The FuncResolve pass may leave cruft around if functions were prototyped
+ // differently than they were defined. Remove this cruft.
+ addPass(Passes, createInstructionCombiningPass());
+
+ // Delete basic blocks, which optimization passes may have killed...
+ addPass(Passes, createCFGSimplificationPass());
+
+ // Now that we have optimized the program, discard unreachable functions...
+ addPass(Passes, createGlobalDCEPass());
+ }
+
+ // Make sure everything is still good.
+ Passes.add(createVerifierPass());
// Add the pass that writes bytecode to the output file...
- Passes.add(new WriteBytecodePass(Out));
+ addPass(Passes, new WriteBytecodePass(Out));
// Run our queue of passes all at once now, efficiently.
Passes.run(*M);
return 0;
}
-//
-// Function: generate_assembly ()
-//
-// Description:
-// This function 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 value:
-// 0 - Success
-// 1 - Failure
-//
+/// 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
-generate_assembly (std::string OutputFilename,
- std::string InputFilename,
- std::string llc,
- char ** const envp)
+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;
- if ((ExecWait (cmd, envp)) == -1)
- {
- return 1;
- }
+ const char *cmd[8];
- return 0;
+ 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);
}
-//
-// Function: generate_native ()
-//
-// Description:
-// This function 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.
-// gcc - The pathname to use for GGC.
-// envp - A copy of the process's current environment.
-//
-// Outputs:
-// None.
-//
-// Return value:
-// 0 - Success
-// 1 - Failure
-//
+/// 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
-generate_native (std::string OutputFilename,
- std::string InputFilename,
- std::vector<std::string> Libraries,
- std::string gcc,
- char ** const envp)
-{
- //
+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 it's environment.
- //
- char ** clean_env = copy_env (envp);
+ // 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;
- }
- remove_env ("LIBRARY_PATH", clean_env);
- remove_env ("COLLECT_GCC_OPTIONS", clean_env);
- remove_env ("GCC_EXEC_PREFIX", clean_env);
- remove_env ("COMPILER_PATH", clean_env);
- remove_env ("COLLECT_GCC", clean_env);
+ 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);
- const char * cmd[8 + Libraries.size()];
+ 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.
- //
- unsigned int index=0;
- cmd[index++] = gcc.c_str();
- cmd[index++] = "-o";
- cmd[index++] = OutputFilename.c_str();
- cmd[index++] = InputFilename.c_str();
- for (; (index - 4) < Libraries.size(); index++)
- {
- Libraries[index - 4] = "-l" + Libraries[index - 4];
- cmd[index] = Libraries[index-4].c_str();
+ 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());
}
- cmd[index++] = NULL;
- if ((ExecWait (cmd, clean_env)) == -1)
- {
- return 1;
+#endif
+
+ // Add in the libraries to link.
+ std::vector<std::string> Libs(Libraries);
+ for (unsigned index = 0; index < Libs.size(); index++) {
+ if (Libs[index] != "crtend") {
+ Libs[index] = "-l" + Libs[index];
+ cmd.push_back(Libs[index].c_str());
+ }
}
+ cmd.push_back(NULL);
- return 0;
+ // Run the compiler to assembly and link together the program.
+ return ExecWait(&(cmd[0]), clean_env);
}
+
+} // End llvm namespace
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