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-rw-r--r--lib/Support/MemoryBuffer.cpp134
1 files changed, 58 insertions, 76 deletions
diff --git a/lib/Support/MemoryBuffer.cpp b/lib/Support/MemoryBuffer.cpp
index 629d885..5f4b7da 100644
--- a/lib/Support/MemoryBuffer.cpp
+++ b/lib/Support/MemoryBuffer.cpp
@@ -14,19 +14,20 @@
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Config/config.h"
+#include "llvm/Support/Errc.h"
#include "llvm/Support/Errno.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/Program.h"
-#include "llvm/Support/system_error.h"
#include <cassert>
#include <cerrno>
#include <cstdio>
#include <cstring>
#include <new>
#include <sys/types.h>
+#include <system_error>
#if !defined(_MSC_VER) && !defined(__MINGW32__)
#include <unistd.h>
#else
@@ -151,17 +152,11 @@ MemoryBuffer *MemoryBuffer::getNewMemBuffer(size_t Size, StringRef BufferName) {
return SB;
}
-
-/// getFileOrSTDIN - Open the specified file as a MemoryBuffer, or open stdin
-/// if the Filename is "-". If an error occurs, this returns null and fills
-/// in *ErrStr with a reason. If stdin is empty, this API (unlike getSTDIN)
-/// returns an empty buffer.
-error_code MemoryBuffer::getFileOrSTDIN(StringRef Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- int64_t FileSize) {
+ErrorOr<std::unique_ptr<MemoryBuffer>>
+MemoryBuffer::getFileOrSTDIN(StringRef Filename, int64_t FileSize) {
if (Filename == "-")
- return getSTDIN(Result);
- return getFile(Filename, Result, FileSize);
+ return getSTDIN();
+ return getFile(Filename, FileSize);
}
@@ -190,7 +185,7 @@ class MemoryBufferMMapFile : public MemoryBuffer {
public:
MemoryBufferMMapFile(bool RequiresNullTerminator, int FD, uint64_t Len,
- uint64_t Offset, error_code EC)
+ uint64_t Offset, std::error_code EC)
: MFR(FD, false, sys::fs::mapped_file_region::readonly,
getLegalMapSize(Len, Offset), getLegalMapOffset(Offset), EC) {
if (!EC) {
@@ -210,9 +205,8 @@ public:
};
}
-static error_code getMemoryBufferForStream(int FD,
- StringRef BufferName,
- std::unique_ptr<MemoryBuffer> &Result) {
+static ErrorOr<std::unique_ptr<MemoryBuffer>>
+getMemoryBufferForStream(int FD, StringRef BufferName) {
const ssize_t ChunkSize = 4096*4;
SmallString<ChunkSize> Buffer;
ssize_t ReadBytes;
@@ -222,52 +216,48 @@ static error_code getMemoryBufferForStream(int FD,
ReadBytes = read(FD, Buffer.end(), ChunkSize);
if (ReadBytes == -1) {
if (errno == EINTR) continue;
- return error_code(errno, posix_category());
+ return std::error_code(errno, std::generic_category());
}
Buffer.set_size(Buffer.size() + ReadBytes);
} while (ReadBytes != 0);
- Result.reset(MemoryBuffer::getMemBufferCopy(Buffer, BufferName));
- return error_code::success();
+ std::unique_ptr<MemoryBuffer> Ret(
+ MemoryBuffer::getMemBufferCopy(Buffer, BufferName));
+ return std::move(Ret);
}
-static error_code getFileAux(const char *Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- int64_t FileSize,
- bool RequiresNullTerminator,
- bool IsVolatileSize);
-
-error_code MemoryBuffer::getFile(Twine Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- int64_t FileSize,
- bool RequiresNullTerminator,
- bool IsVolatileSize) {
+static ErrorOr<std::unique_ptr<MemoryBuffer>>
+getFileAux(const char *Filename, int64_t FileSize, bool RequiresNullTerminator,
+ bool IsVolatileSize);
+
+ErrorOr<std::unique_ptr<MemoryBuffer>>
+MemoryBuffer::getFile(Twine Filename, int64_t FileSize,
+ bool RequiresNullTerminator, bool IsVolatileSize) {
// Ensure the path is null terminated.
SmallString<256> PathBuf;
StringRef NullTerminatedName = Filename.toNullTerminatedStringRef(PathBuf);
- return getFileAux(NullTerminatedName.data(), Result, FileSize,
- RequiresNullTerminator, IsVolatileSize);
+ return getFileAux(NullTerminatedName.data(), FileSize, RequiresNullTerminator,
+ IsVolatileSize);
}
-static error_code getOpenFileImpl(int FD, const char *Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- uint64_t FileSize, uint64_t MapSize,
- int64_t Offset, bool RequiresNullTerminator,
- bool IsVolatileSize);
+static ErrorOr<std::unique_ptr<MemoryBuffer>>
+getOpenFileImpl(int FD, const char *Filename, uint64_t FileSize,
+ uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
+ bool IsVolatileSize);
-static error_code getFileAux(const char *Filename,
- std::unique_ptr<MemoryBuffer> &Result, int64_t FileSize,
- bool RequiresNullTerminator,
- bool IsVolatileSize) {
+static ErrorOr<std::unique_ptr<MemoryBuffer>>
+getFileAux(const char *Filename, int64_t FileSize, bool RequiresNullTerminator,
+ bool IsVolatileSize) {
int FD;
- error_code EC = sys::fs::openFileForRead(Filename, FD);
+ std::error_code EC = sys::fs::openFileForRead(Filename, FD);
if (EC)
return EC;
- error_code ret = getOpenFileImpl(FD, Filename, Result, FileSize, FileSize, 0,
- RequiresNullTerminator, IsVolatileSize);
+ ErrorOr<std::unique_ptr<MemoryBuffer>> Ret =
+ getOpenFileImpl(FD, Filename, FileSize, FileSize, 0,
+ RequiresNullTerminator, IsVolatileSize);
close(FD);
- return ret;
+ return Ret;
}
static bool shouldUseMmap(int FD,
@@ -318,11 +308,10 @@ static bool shouldUseMmap(int FD,
return true;
}
-static error_code getOpenFileImpl(int FD, const char *Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- uint64_t FileSize, uint64_t MapSize,
- int64_t Offset, bool RequiresNullTerminator,
- bool IsVolatileSize) {
+static ErrorOr<std::unique_ptr<MemoryBuffer>>
+getOpenFileImpl(int FD, const char *Filename, uint64_t FileSize,
+ uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
+ bool IsVolatileSize) {
static int PageSize = sys::process::get_self()->page_size();
// Default is to map the full file.
@@ -331,7 +320,7 @@ static error_code getOpenFileImpl(int FD, const char *Filename,
// file descriptor is cheaper than stat on a random path.
if (FileSize == uint64_t(-1)) {
sys::fs::file_status Status;
- error_code EC = sys::fs::status(FD, Status);
+ std::error_code EC = sys::fs::status(FD, Status);
if (EC)
return EC;
@@ -341,7 +330,7 @@ static error_code getOpenFileImpl(int FD, const char *Filename,
sys::fs::file_type Type = Status.type();
if (Type != sys::fs::file_type::regular_file &&
Type != sys::fs::file_type::block_file)
- return getMemoryBufferForStream(FD, Filename, Result);
+ return getMemoryBufferForStream(FD, Filename);
FileSize = Status.getSize();
}
@@ -350,11 +339,12 @@ static error_code getOpenFileImpl(int FD, const char *Filename,
if (shouldUseMmap(FD, FileSize, MapSize, Offset, RequiresNullTerminator,
PageSize, IsVolatileSize)) {
- error_code EC;
- Result.reset(new (NamedBufferAlloc(Filename)) MemoryBufferMMapFile(
- RequiresNullTerminator, FD, MapSize, Offset, EC));
+ std::error_code EC;
+ std::unique_ptr<MemoryBuffer> Result(
+ new (NamedBufferAlloc(Filename))
+ MemoryBufferMMapFile(RequiresNullTerminator, FD, MapSize, Offset, EC));
if (!EC)
- return error_code::success();
+ return std::move(Result);
}
MemoryBuffer *Buf = MemoryBuffer::getNewUninitMemBuffer(MapSize, Filename);
@@ -370,7 +360,7 @@ static error_code getOpenFileImpl(int FD, const char *Filename,
size_t BytesLeft = MapSize;
#ifndef HAVE_PREAD
if (lseek(FD, Offset, SEEK_SET) == -1)
- return error_code(errno, posix_category());
+ return std::error_code(errno, std::generic_category());
#endif
while (BytesLeft) {
@@ -383,7 +373,7 @@ static error_code getOpenFileImpl(int FD, const char *Filename,
if (errno == EINTR)
continue;
// Error while reading.
- return error_code(errno, posix_category());
+ return std::error_code(errno, std::generic_category());
}
if (NumRead == 0) {
memset(BufPtr, 0, BytesLeft); // zero-initialize rest of the buffer.
@@ -393,37 +383,29 @@ static error_code getOpenFileImpl(int FD, const char *Filename,
BufPtr += NumRead;
}
- Result.swap(SB);
- return error_code::success();
+ return std::move(SB);
}
-error_code MemoryBuffer::getOpenFile(int FD, const char *Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- uint64_t FileSize,
- bool RequiresNullTerminator,
- bool IsVolatileSize) {
- return getOpenFileImpl(FD, Filename, Result, FileSize, FileSize, 0,
+ErrorOr<std::unique_ptr<MemoryBuffer>>
+MemoryBuffer::getOpenFile(int FD, const char *Filename, uint64_t FileSize,
+ bool RequiresNullTerminator, bool IsVolatileSize) {
+ return getOpenFileImpl(FD, Filename, FileSize, FileSize, 0,
RequiresNullTerminator, IsVolatileSize);
}
-error_code MemoryBuffer::getOpenFileSlice(int FD, const char *Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- uint64_t MapSize, int64_t Offset,
- bool IsVolatileSize) {
- return getOpenFileImpl(FD, Filename, Result, -1, MapSize, Offset, false,
+ErrorOr<std::unique_ptr<MemoryBuffer>>
+MemoryBuffer::getOpenFileSlice(int FD, const char *Filename, uint64_t MapSize,
+ int64_t Offset, bool IsVolatileSize) {
+ return getOpenFileImpl(FD, Filename, -1, MapSize, Offset, false,
IsVolatileSize);
}
-//===----------------------------------------------------------------------===//
-// MemoryBuffer::getSTDIN implementation.
-//===----------------------------------------------------------------------===//
-
-error_code MemoryBuffer::getSTDIN(std::unique_ptr<MemoryBuffer> &Result) {
+ErrorOr<std::unique_ptr<MemoryBuffer>> MemoryBuffer::getSTDIN() {
// Read in all of the data from stdin, we cannot mmap stdin.
//
// FIXME: That isn't necessarily true, we should try to mmap stdin and
// fallback if it fails.
sys::ChangeStdinToBinary();
- return getMemoryBufferForStream(0, "<stdin>", Result);
+ return getMemoryBufferForStream(0, "<stdin>");
}
generated by cgit v1.1 at 2024-05-26 17:46:22 +0000