X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FSupport%2FProgram.h;h=5f1bc12601b1d76c7b9c1a6b9fc52cfaabd4c0a2;hb=cf0db29df20d9c665da7e82bb261bdd7cf7f1b2b;hp=513435187f4887cdfbf43f22097ff2528df2f998;hpb=593fcb56b37857d64e58ac3be5277d3cfccb9492;p=oota-llvm.git diff --git a/include/llvm/Support/Program.h b/include/llvm/Support/Program.h index 513435187f4..5f1bc12601b 100644 --- a/include/llvm/Support/Program.h +++ b/include/llvm/Support/Program.h @@ -15,11 +15,12 @@ #define LLVM_SUPPORT_PROGRAM_H #include "llvm/ADT/ArrayRef.h" -#include "llvm/Support/Path.h" -#include "llvm/Support/system_error.h" +#include "llvm/Support/ErrorOr.h" +#include namespace llvm { -class error_code; +class StringRef; + namespace sys { /// This is the OS-specific separator for PATH like environment variables: @@ -30,42 +31,73 @@ namespace sys { const char EnvPathSeparator = ';'; #endif - /// This static constructor (factory) will attempt to locate a program in - /// the operating system's file system using some pre-determined set of - /// locations to search (e.g. the PATH on Unix). Paths with slashes are - /// returned unmodified. - /// @returns A Path object initialized to the path of the program or a - /// Path object that is empty (invalid) if the program could not be found. - /// @brief Construct a Program by finding it by name. - std::string FindProgramByName(const std::string& name); - - // These functions change the specified standard stream (stdin, stdout, or - // stderr) to binary mode. They return errc::success if the specified stream +/// @brief This struct encapsulates information about a process. +struct ProcessInfo { +#if defined(LLVM_ON_UNIX) + typedef pid_t ProcessId; +#elif defined(LLVM_ON_WIN32) + typedef unsigned long ProcessId; // Must match the type of DWORD on Windows. + typedef void * HANDLE; // Must match the type of HANDLE on Windows. + /// The handle to the process (available on Windows only). + HANDLE ProcessHandle; +#else +#error "ProcessInfo is not defined for this platform!" +#endif + + /// The process identifier. + ProcessId Pid; + + /// The return code, set after execution. + int ReturnCode; + + ProcessInfo(); +}; + + /// \brief Find the first executable file \p Name in \p Paths. + /// + /// This does not perform hashing as a shell would but instead stats each PATH + /// entry individually so should generally be avoided. Core LLVM library + /// functions and options should instead require fully specified paths. + /// + /// \param Name name of the executable to find. If it contains any system + /// slashes, it will be returned as is. + /// \param Paths optional list of paths to search for \p Name. If empty it + /// will use the system PATH environment instead. + /// + /// \returns The fully qualified path to the first \p Name in \p Paths if it + /// exists. \p Name if \p Name has slashes in it. Otherwise an error. + ErrorOr + findProgramByName(StringRef Name, + ArrayRef Paths = ArrayRef()); + + // These functions change the specified standard stream (stdin or stdout) to + // binary mode. They return errc::success if the specified stream // was changed. Otherwise a platform dependent error is returned. - error_code ChangeStdinToBinary(); - error_code ChangeStdoutToBinary(); - error_code ChangeStderrToBinary(); + std::error_code ChangeStdinToBinary(); + std::error_code ChangeStdoutToBinary(); /// This function executes the program using the arguments provided. The /// invoked program will inherit the stdin, stdout, and stderr file /// descriptors, the environment and other configuration settings of the /// invoking program. - /// This function waits the program to finish. + /// This function waits for the program to finish, so should be avoided in + /// library functions that aren't expected to block. Consider using + /// ExecuteNoWait() instead. /// @returns an integer result code indicating the status of the program. /// A zero or positive value indicates the result code of the program. /// -1 indicates failure to execute /// -2 indicates a crash during execution or timeout int ExecuteAndWait( StringRef Program, ///< Path of the program to be executed. It is - /// presumed this is the result of the FindProgramByName method. + /// presumed this is the result of the findProgramByName method. const char **args, ///< A vector of strings that are passed to the ///< program. The first element should be the name of the program. ///< The list *must* be terminated by a null char* entry. - const char **env = 0, ///< An optional vector of strings to use for + const char **env = nullptr, ///< An optional vector of strings to use for ///< the program's environment. If not provided, the current program's ///< environment will be used. - const StringRef **redirects = 0, ///< An optional array of pointers to - ///< paths. If the array is null, no redirection is done. The array + const StringRef **redirects = nullptr, ///< An optional array of pointers + ///< to paths. If the array is null, no redirection is done. The array ///< should have a size of at least three. The inferior process's ///< stdin(0), stdout(1), and stderr(2) will be redirected to the ///< corresponding paths. @@ -81,21 +113,81 @@ namespace sys { ///< of memory can be allocated by process. If memory usage will be ///< higher limit, the child is killed and this call returns. If zero ///< - no memory limit. - std::string *ErrMsg = 0, ///< If non-zero, provides a pointer to a string - ///< instance in which error messages will be returned. If the string - ///< is non-empty upon return an error occurred while invoking the + std::string *ErrMsg = nullptr, ///< If non-zero, provides a pointer to a + ///< string instance in which error messages will be returned. If the + ///< string is non-empty upon return an error occurred while invoking the ///< program. - bool *ExecutionFailed = 0); + bool *ExecutionFailed = nullptr); - /// Similar to ExecuteAndWait, but return immediately. - void ExecuteNoWait(StringRef Program, const char **args, const char **env = 0, - const StringRef **redirects = 0, unsigned memoryLimit = 0, - std::string *ErrMsg = 0); + /// Similar to ExecuteAndWait, but returns immediately. + /// @returns The \see ProcessInfo of the newly launced process. + /// \note On Microsoft Windows systems, users will need to either call \see + /// Wait until the process finished execution or win32 CloseHandle() API on + /// ProcessInfo.ProcessHandle to avoid memory leaks. + ProcessInfo + ExecuteNoWait(StringRef Program, const char **args, const char **env = nullptr, + const StringRef **redirects = nullptr, unsigned memoryLimit = 0, + std::string *ErrMsg = nullptr, bool *ExecutionFailed = nullptr); - // Return true if the given arguments fit within system-specific - // argument length limits. + /// Return true if the given arguments fit within system-specific + /// argument length limits. bool argumentsFitWithinSystemLimits(ArrayRef Args); -} -} + + /// File encoding options when writing contents that a non-UTF8 tool will + /// read (on Windows systems). For UNIX, we always use UTF-8. + enum WindowsEncodingMethod { + /// UTF-8 is the LLVM native encoding, being the same as "do not perform + /// encoding conversion". + WEM_UTF8, + WEM_CurrentCodePage, + WEM_UTF16 + }; + + /// Saves the UTF8-encoded \p contents string into the file \p FileName + /// using a specific encoding. + /// + /// This write file function adds the possibility to choose which encoding + /// to use when writing a text file. On Windows, this is important when + /// writing files with internationalization support with an encoding that is + /// different from the one used in LLVM (UTF-8). We use this when writing + /// response files, since GCC tools on MinGW only understand legacy code + /// pages, and VisualStudio tools only understand UTF-16. + /// For UNIX, using different encodings is silently ignored, since all tools + /// work well with UTF-8. + /// This function assumes that you only use UTF-8 *text* data and will convert + /// it to your desired encoding before writing to the file. + /// + /// FIXME: We use EM_CurrentCodePage to write response files for GNU tools in + /// a MinGW/MinGW-w64 environment, which has serious flaws but currently is + /// our best shot to make gcc/ld understand international characters. This + /// should be changed as soon as binutils fix this to support UTF16 on mingw. + /// + /// \returns non-zero error_code if failed + std::error_code + writeFileWithEncoding(StringRef FileName, StringRef Contents, + WindowsEncodingMethod Encoding = WEM_UTF8); + + /// This function waits for the process specified by \p PI to finish. + /// \returns A \see ProcessInfo struct with Pid set to: + /// \li The process id of the child process if the child process has changed + /// state. + /// \li 0 if the child process has not changed state. + /// \note Users of this function should always check the ReturnCode member of + /// the \see ProcessInfo returned from this function. + ProcessInfo Wait( + const ProcessInfo &PI, ///< The child process that should be waited on. + unsigned SecondsToWait, ///< If non-zero, this specifies the amount of + ///< time to wait for the child process to exit. If the time expires, the + ///< child is killed and this function returns. If zero, this function + ///< will perform a non-blocking wait on the child process. + bool WaitUntilTerminates, ///< If true, ignores \p SecondsToWait and waits + ///< until child has terminated. + std::string *ErrMsg = nullptr ///< If non-zero, provides a pointer to a + ///< string instance in which error messages will be returned. If the + ///< string is non-empty upon return an error occurred while invoking the + ///< program. + ); + } // namespace sys +} // namespace llvm #endif