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3b1f0fea31
It is now known that result code description vary depending on the module, and so they're best defined on a per-module basis. To support this, allow passing in an arbitrary integer instead of limiting to the ones in the ErrorDescription enum. These will be gradually migrated to their individual users, but a few will be kept as "common" codes shared by all modules.
458 lines
13 KiB
C++
458 lines
13 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <new>
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#include <utility>
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#include "common/assert.h"
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#include "common/bit_field.h"
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#include "common/common_funcs.h"
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#include "common/common_types.h"
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// All the constants in this file come from http://3dbrew.org/wiki/Error_codes
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/**
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* Detailed description of the error. Code 0 always means success. Codes 1000 and above are
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* considered "well-known" and have common values between all modules. The meaning of other codes
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* vary by module.
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*/
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enum class ErrorDescription : u32 {
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Success = 0,
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SessionClosedByRemote = 26,
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WrongPermission = 46,
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OS_InvalidBufferDescriptor = 48,
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MaxConnectionsReached = 52,
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WrongAddress = 53,
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FS_RomFSNotFound = 100,
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FS_ArchiveNotMounted = 101,
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FS_FileNotFound = 112,
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FS_PathNotFound = 113,
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FS_GameCardNotInserted = 141,
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FS_NotFound = 120,
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FS_FileAlreadyExists = 180,
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FS_DirectoryAlreadyExists = 185,
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FS_AlreadyExists = 190,
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FS_InvalidOpenFlags = 230,
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FS_DirectoryNotEmpty = 240,
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FS_NotAFile = 250,
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FS_NotFormatted = 340, ///< This is used by the FS service when creating a SaveData archive
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OutofRangeOrMisalignedAddress =
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513, // TODO(purpasmart): Check if this name fits its actual usage
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GPU_FirstInitialization = 519,
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FS_ExeFSSectionNotFound = 567,
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FS_CommandNotAllowed = 630,
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FS_InvalidReadFlag = 700,
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FS_InvalidPath = 702,
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FS_WriteBeyondEnd = 705,
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FS_UnsupportedOpenFlags = 760,
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FS_IncorrectExeFSReadSize = 761,
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FS_UnexpectedFileOrDirectory = 770,
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// Codes 1000 and above are considered "well-known" and have common values between all modules.
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InvalidSection = 1000,
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TooLarge = 1001,
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NotAuthorized = 1002,
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AlreadyDone = 1003,
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InvalidSize = 1004,
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InvalidEnumValue = 1005,
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InvalidCombination = 1006,
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NoData = 1007,
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Busy = 1008,
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MisalignedAddress = 1009,
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MisalignedSize = 1010,
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OutOfMemory = 1011,
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NotImplemented = 1012,
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InvalidAddress = 1013,
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InvalidPointer = 1014,
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InvalidHandle = 1015,
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NotInitialized = 1016,
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AlreadyInitialized = 1017,
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NotFound = 1018,
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CancelRequested = 1019,
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AlreadyExists = 1020,
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OutOfRange = 1021,
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Timeout = 1022,
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InvalidResultValue = 1023,
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};
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/**
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* Identifies the module which caused the error. Error codes can be propagated through a call
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* chain, meaning that this doesn't always correspond to the module where the API call made is
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* contained.
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*/
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enum class ErrorModule : u32 {
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Common = 0,
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Kernel = 1,
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Util = 2,
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FileServer = 3,
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LoaderServer = 4,
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TCB = 5,
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OS = 6,
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DBG = 7,
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DMNT = 8,
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PDN = 9,
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GX = 10,
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I2C = 11,
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GPIO = 12,
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DD = 13,
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CODEC = 14,
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SPI = 15,
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PXI = 16,
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FS = 17,
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DI = 18,
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HID = 19,
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CAM = 20,
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PI = 21,
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PM = 22,
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PM_LOW = 23,
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FSI = 24,
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SRV = 25,
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NDM = 26,
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NWM = 27,
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SOC = 28,
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LDR = 29,
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ACC = 30,
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RomFS = 31,
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AM = 32,
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HIO = 33,
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Updater = 34,
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MIC = 35,
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FND = 36,
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MP = 37,
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MPWL = 38,
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AC = 39,
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HTTP = 40,
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DSP = 41,
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SND = 42,
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DLP = 43,
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HIO_LOW = 44,
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CSND = 45,
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SSL = 46,
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AM_LOW = 47,
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NEX = 48,
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Friends = 49,
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RDT = 50,
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Applet = 51,
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NIM = 52,
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PTM = 53,
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MIDI = 54,
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MC = 55,
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SWC = 56,
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FatFS = 57,
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NGC = 58,
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CARD = 59,
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CARDNOR = 60,
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SDMC = 61,
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BOSS = 62,
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DBM = 63,
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Config = 64,
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PS = 65,
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CEC = 66,
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IR = 67,
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UDS = 68,
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PL = 69,
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CUP = 70,
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Gyroscope = 71,
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MCU = 72,
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NS = 73,
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News = 74,
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RO = 75,
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GD = 76,
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CardSPI = 77,
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EC = 78,
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WebBrowser = 79,
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Test = 80,
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ENC = 81,
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PIA = 82,
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ACT = 83,
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VCTL = 84,
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OLV = 85,
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NEIA = 86,
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NPNS = 87,
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AVD = 90,
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L2B = 91,
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MVD = 92,
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NFC = 93,
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UART = 94,
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SPM = 95,
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QTM = 96,
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NFP = 97,
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Application = 254,
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InvalidResult = 255
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};
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/// A less specific error cause.
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enum class ErrorSummary : u32 {
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Success = 0,
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NothingHappened = 1,
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WouldBlock = 2,
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OutOfResource = 3, ///< There are no more kernel resources (memory, table slots) to
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///< execute the operation.
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NotFound = 4, ///< A file or resource was not found.
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InvalidState = 5,
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NotSupported = 6, ///< The operation is not supported or not implemented.
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InvalidArgument = 7, ///< Returned when a passed argument is invalid in the current runtime
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///< context. (Invalid handle, out-of-bounds pointer or size, etc.)
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WrongArgument = 8, ///< Returned when a passed argument is in an incorrect format for use
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///< with the function. (E.g. Invalid enum value)
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Canceled = 9,
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StatusChanged = 10,
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Internal = 11,
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InvalidResult = 63
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};
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/// The severity of the error.
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enum class ErrorLevel : u32 {
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Success = 0,
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Info = 1,
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Status = 25,
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Temporary = 26,
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Permanent = 27,
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Usage = 28,
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Reinitialize = 29,
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Reset = 30,
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Fatal = 31
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};
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/// Encapsulates a CTR-OS error code, allowing it to be separated into its constituent fields.
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union ResultCode {
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u32 raw;
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BitField<0, 10, u32> description;
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BitField<10, 8, ErrorModule> module;
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BitField<21, 6, ErrorSummary> summary;
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BitField<27, 5, ErrorLevel> level;
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// The last bit of `level` is checked by apps and the kernel to determine if a result code is an
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// error
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BitField<31, 1, u32> is_error;
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constexpr explicit ResultCode(u32 raw) : raw(raw) {}
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constexpr ResultCode(ErrorDescription description, ErrorModule module, ErrorSummary summary,
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ErrorLevel level)
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: ResultCode(static_cast<u32>(description), module, summary, level) {}
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constexpr ResultCode(u32 description_, ErrorModule module_, ErrorSummary summary_,
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ErrorLevel level_)
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: raw(description.FormatValue(description_) | module.FormatValue(module_) |
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summary.FormatValue(summary_) | level.FormatValue(level_)) {}
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constexpr ResultCode& operator=(const ResultCode& o) {
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raw = o.raw;
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return *this;
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}
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constexpr bool IsSuccess() const {
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return is_error.ExtractValue(raw) == 0;
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}
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constexpr bool IsError() const {
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return is_error.ExtractValue(raw) == 1;
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}
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};
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constexpr bool operator==(const ResultCode& a, const ResultCode& b) {
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return a.raw == b.raw;
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}
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constexpr bool operator!=(const ResultCode& a, const ResultCode& b) {
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return a.raw != b.raw;
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}
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// Convenience functions for creating some common kinds of errors:
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/// The default success `ResultCode`.
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constexpr ResultCode RESULT_SUCCESS(0);
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/// Might be returned instead of a dummy success for unimplemented APIs.
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constexpr ResultCode UnimplementedFunction(ErrorModule module) {
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return ResultCode(ErrorDescription::NotImplemented, module, ErrorSummary::NotSupported,
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ErrorLevel::Permanent);
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}
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/**
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* This is an optional value type. It holds a `ResultCode` and, if that code is a success code,
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* also holds a result of type `T`. If the code is an error code then trying to access the inner
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* value fails, thus ensuring that the ResultCode of functions is always checked properly before
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* their return value is used. It is similar in concept to the `std::optional` type
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* (http://en.cppreference.com/w/cpp/experimental/optional) originally proposed for inclusion in
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* C++14, or the `Result` type in Rust (http://doc.rust-lang.org/std/result/index.html).
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*
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* An example of how it could be used:
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* \code
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* ResultVal<int> Frobnicate(float strength) {
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* if (strength < 0.f || strength > 1.0f) {
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* // Can't frobnicate too weakly or too strongly
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* return ResultCode(ErrorDescription::OutOfRange, ErrorModule::Common,
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* ErrorSummary::InvalidArgument, ErrorLevel::Permanent);
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* } else {
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* // Frobnicated! Give caller a cookie
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* return MakeResult<int>(42);
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* }
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* }
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* \endcode
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*
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* \code
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* ResultVal<int> frob_result = Frobnicate(0.75f);
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* if (frob_result) {
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* // Frobbed ok
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* printf("My cookie is %d\n", *frob_result);
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* } else {
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* printf("Guess I overdid it. :( Error code: %ux\n", frob_result.code().hex);
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* }
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* \endcode
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*/
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template <typename T>
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class ResultVal {
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public:
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/// Constructs an empty `ResultVal` with the given error code. The code must not be a success
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/// code.
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ResultVal(ResultCode error_code = ResultCode(-1)) : result_code(error_code) {
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ASSERT(error_code.IsError());
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}
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/**
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* Similar to the non-member function `MakeResult`, with the exception that you can manually
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* specify the success code. `success_code` must not be an error code.
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*/
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template <typename... Args>
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static ResultVal WithCode(ResultCode success_code, Args&&... args) {
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ResultVal<T> result;
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result.emplace(success_code, std::forward<Args>(args)...);
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return result;
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}
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ResultVal(const ResultVal& o) : result_code(o.result_code) {
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if (!o.empty()) {
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new (&object) T(o.object);
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}
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}
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ResultVal(ResultVal&& o) : result_code(o.result_code) {
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if (!o.empty()) {
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new (&object) T(std::move(o.object));
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}
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}
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~ResultVal() {
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if (!empty()) {
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object.~T();
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}
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}
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ResultVal& operator=(const ResultVal& o) {
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if (!empty()) {
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if (!o.empty()) {
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object = o.object;
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} else {
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object.~T();
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}
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} else {
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if (!o.empty()) {
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new (&object) T(o.object);
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}
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}
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result_code = o.result_code;
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return *this;
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}
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/**
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* Replaces the current result with a new constructed result value in-place. The code must not
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* be an error code.
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*/
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template <typename... Args>
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void emplace(ResultCode success_code, Args&&... args) {
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ASSERT(success_code.IsSuccess());
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if (!empty()) {
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object.~T();
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}
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new (&object) T(std::forward<Args>(args)...);
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result_code = success_code;
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}
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/// Returns true if the `ResultVal` contains an error code and no value.
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bool empty() const {
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return result_code.IsError();
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}
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/// Returns true if the `ResultVal` contains a return value.
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bool Succeeded() const {
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return result_code.IsSuccess();
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}
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/// Returns true if the `ResultVal` contains an error code and no value.
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bool Failed() const {
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return empty();
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}
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ResultCode Code() const {
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return result_code;
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}
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const T& operator*() const {
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return object;
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}
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T& operator*() {
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return object;
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}
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const T* operator->() const {
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return &object;
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}
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T* operator->() {
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return &object;
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}
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/// Returns the value contained in this `ResultVal`, or the supplied default if it is missing.
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template <typename U>
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T ValueOr(U&& value) const {
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return !empty() ? object : std::move(value);
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}
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/// Asserts that the result succeeded and returns a reference to it.
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T& Unwrap() {
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ASSERT_MSG(Succeeded(), "Tried to Unwrap empty ResultVal");
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return **this;
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}
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T&& MoveFrom() {
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return std::move(Unwrap());
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}
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private:
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// A union is used to allocate the storage for the value, while allowing us to construct and
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// destruct it at will.
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union {
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T object;
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};
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ResultCode result_code;
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};
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/**
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* This function is a helper used to construct `ResultVal`s. It receives the arguments to construct
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* `T` with and creates a success `ResultVal` contained the constructed value.
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*/
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template <typename T, typename... Args>
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ResultVal<T> MakeResult(Args&&... args) {
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return ResultVal<T>::WithCode(RESULT_SUCCESS, std::forward<Args>(args)...);
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}
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/**
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* Check for the success of `source` (which must evaluate to a ResultVal). If it succeeds, unwraps
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* the contained value and assigns it to `target`, which can be either an l-value expression or a
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* variable declaration. If it fails the return code is returned from the current function. Thus it
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* can be used to cascade errors out, achieving something akin to exception handling.
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*/
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#define CASCADE_RESULT(target, source) \
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auto CONCAT2(check_result_L, __LINE__) = source; \
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if (CONCAT2(check_result_L, __LINE__).Failed()) \
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return CONCAT2(check_result_L, __LINE__).Code(); \
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target = std::move(*CONCAT2(check_result_L, __LINE__))
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