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198 lines
9.0 KiB
C++
198 lines
9.0 KiB
C++
//===- llvm/Support/Program.h ------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the llvm::sys::Program class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_PROGRAM_H
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#define LLVM_SUPPORT_PROGRAM_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/ErrorOr.h"
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#include <system_error>
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namespace llvm {
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namespace sys {
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/// This is the OS-specific separator for PATH like environment variables:
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// a colon on Unix or a semicolon on Windows.
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#if defined(LLVM_ON_UNIX)
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const char EnvPathSeparator = ':';
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#elif defined (LLVM_ON_WIN32)
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const char EnvPathSeparator = ';';
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#endif
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/// @brief This struct encapsulates information about a process.
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struct ProcessInfo {
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#if defined(LLVM_ON_UNIX)
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typedef pid_t ProcessId;
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#elif defined(LLVM_ON_WIN32)
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typedef unsigned long ProcessId; // Must match the type of DWORD on Windows.
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typedef void * HANDLE; // Must match the type of HANDLE on Windows.
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/// The handle to the process (available on Windows only).
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HANDLE ProcessHandle;
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#else
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#error "ProcessInfo is not defined for this platform!"
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#endif
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enum : ProcessId { InvalidPid = 0 };
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/// The process identifier.
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ProcessId Pid;
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/// The return code, set after execution.
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int ReturnCode;
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ProcessInfo();
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};
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/// \brief Find the first executable file \p Name in \p Paths.
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///
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/// This does not perform hashing as a shell would but instead stats each PATH
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/// entry individually so should generally be avoided. Core LLVM library
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/// functions and options should instead require fully specified paths.
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///
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/// \param Name name of the executable to find. If it contains any system
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/// slashes, it will be returned as is.
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/// \param Paths optional list of paths to search for \p Name. If empty it
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/// will use the system PATH environment instead.
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///
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/// \returns The fully qualified path to the first \p Name in \p Paths if it
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/// exists. \p Name if \p Name has slashes in it. Otherwise an error.
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ErrorOr<std::string>
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findProgramByName(StringRef Name, ArrayRef<StringRef> Paths = {});
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// These functions change the specified standard stream (stdin or stdout) to
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// binary mode. They return errc::success if the specified stream
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// was changed. Otherwise a platform dependent error is returned.
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std::error_code ChangeStdinToBinary();
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std::error_code ChangeStdoutToBinary();
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/// This function executes the program using the arguments provided. The
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/// invoked program will inherit the stdin, stdout, and stderr file
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/// descriptors, the environment and other configuration settings of the
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/// invoking program.
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/// This function waits for the program to finish, so should be avoided in
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/// library functions that aren't expected to block. Consider using
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/// ExecuteNoWait() instead.
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/// \returns an integer result code indicating the status of the program.
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/// A zero or positive value indicates the result code of the program.
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/// -1 indicates failure to execute
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/// -2 indicates a crash during execution or timeout
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int ExecuteAndWait(
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StringRef Program, ///< Path of the program to be executed. It is
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///< presumed this is the result of the findProgramByName method.
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const char **Args, ///< A vector of strings that are passed to the
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///< program. The first element should be the name of the program.
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///< The list *must* be terminated by a null char* entry.
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const char **Env = nullptr, ///< An optional vector of strings to use for
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///< the program's environment. If not provided, the current program's
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///< environment will be used.
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ArrayRef<Optional<StringRef>> Redirects = {}, ///<
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///< An array of optional paths. Should have a size of zero or three.
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///< If the array is empty, no redirections are performed.
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///< Otherwise, the inferior process's stdin(0), stdout(1), and stderr(2)
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///< will be redirected to the corresponding paths, if the optional path
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///< is present (not \c llvm::None).
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///< When an empty path is passed in, the corresponding file descriptor
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///< will be disconnected (ie, /dev/null'd) in a portable way.
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unsigned SecondsToWait = 0, ///< If non-zero, this specifies the amount
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///< of time to wait for the child process to exit. If the time
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///< expires, the child is killed and this call returns. If zero,
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///< this function will wait until the child finishes or forever if
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///< it doesn't.
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unsigned MemoryLimit = 0, ///< If non-zero, this specifies max. amount
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///< of memory can be allocated by process. If memory usage will be
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///< higher limit, the child is killed and this call returns. If zero
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///< - no memory limit.
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std::string *ErrMsg = nullptr, ///< If non-zero, provides a pointer to a
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///< string instance in which error messages will be returned. If the
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///< string is non-empty upon return an error occurred while invoking the
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///< program.
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bool *ExecutionFailed = nullptr);
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/// Similar to ExecuteAndWait, but returns immediately.
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/// @returns The \see ProcessInfo of the newly launced process.
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/// \note On Microsoft Windows systems, users will need to either call
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/// \see Wait until the process finished execution or win32 CloseHandle() API
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/// on ProcessInfo.ProcessHandle to avoid memory leaks.
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ProcessInfo ExecuteNoWait(StringRef Program, const char **Args,
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const char **Env = nullptr,
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ArrayRef<Optional<StringRef>> Redirects = {},
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unsigned MemoryLimit = 0,
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std::string *ErrMsg = nullptr,
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bool *ExecutionFailed = nullptr);
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/// Return true if the given arguments fit within system-specific
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/// argument length limits.
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bool commandLineFitsWithinSystemLimits(StringRef Program,
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ArrayRef<const char *> Args);
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/// File encoding options when writing contents that a non-UTF8 tool will
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/// read (on Windows systems). For UNIX, we always use UTF-8.
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enum WindowsEncodingMethod {
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/// UTF-8 is the LLVM native encoding, being the same as "do not perform
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/// encoding conversion".
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WEM_UTF8,
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WEM_CurrentCodePage,
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WEM_UTF16
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};
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/// Saves the UTF8-encoded \p contents string into the file \p FileName
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/// using a specific encoding.
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///
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/// This write file function adds the possibility to choose which encoding
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/// to use when writing a text file. On Windows, this is important when
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/// writing files with internationalization support with an encoding that is
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/// different from the one used in LLVM (UTF-8). We use this when writing
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/// response files, since GCC tools on MinGW only understand legacy code
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/// pages, and VisualStudio tools only understand UTF-16.
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/// For UNIX, using different encodings is silently ignored, since all tools
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/// work well with UTF-8.
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/// This function assumes that you only use UTF-8 *text* data and will convert
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/// it to your desired encoding before writing to the file.
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///
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/// FIXME: We use EM_CurrentCodePage to write response files for GNU tools in
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/// a MinGW/MinGW-w64 environment, which has serious flaws but currently is
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/// our best shot to make gcc/ld understand international characters. This
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/// should be changed as soon as binutils fix this to support UTF16 on mingw.
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///
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/// \returns non-zero error_code if failed
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std::error_code
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writeFileWithEncoding(StringRef FileName, StringRef Contents,
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WindowsEncodingMethod Encoding = WEM_UTF8);
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/// This function waits for the process specified by \p PI to finish.
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/// \returns A \see ProcessInfo struct with Pid set to:
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/// \li The process id of the child process if the child process has changed
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/// state.
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/// \li 0 if the child process has not changed state.
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/// \note Users of this function should always check the ReturnCode member of
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/// the \see ProcessInfo returned from this function.
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ProcessInfo Wait(
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const ProcessInfo &PI, ///< The child process that should be waited on.
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unsigned SecondsToWait, ///< If non-zero, this specifies the amount of
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///< time to wait for the child process to exit. If the time expires, the
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///< child is killed and this function returns. If zero, this function
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///< will perform a non-blocking wait on the child process.
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bool WaitUntilTerminates, ///< If true, ignores \p SecondsToWait and waits
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///< until child has terminated.
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std::string *ErrMsg = nullptr ///< If non-zero, provides a pointer to a
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///< string instance in which error messages will be returned. If the
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///< string is non-empty upon return an error occurred while invoking the
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///< program.
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);
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}
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}
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#endif
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