mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
8b0ab1cc49
Also have swift-reflection-test check if the symbol exists. This allows swift-reflection-test to work with older Remote Mirror dylibs that don't have it. rdar://problem/50030805
589 lines
18 KiB
C
589 lines
18 KiB
C
//===--- swift-reflection-test.c - Reflection testing application ---------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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// This file supports performing target-specific remote reflection tests
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// on live swift executables.
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//===----------------------------------------------------------------------===//
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#define MAX(a,b) (((a)>(b))?(a):(b))
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#include "swift/SwiftRemoteMirror/SwiftRemoteMirror.h"
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#include "swift/Demangling/ManglingMacros.h"
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#include "messages.h"
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#include "overrides.h"
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#include <assert.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
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#include <unistd.h>
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#elif defined(_WIN32)
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#include <io.h>
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#include <fcntl.h>
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#endif
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typedef struct PipeMemoryReader {
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int to_child[2];
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int from_child[2];
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} PipeMemoryReader;
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typedef struct RemoteSection {
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uintptr_t StartAddress;
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uintptr_t Size;
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uintptr_t EndAddress;
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} RemoteSection;
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typedef struct RemoteReflectionInfo {
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RemoteSection fieldmd;
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RemoteSection assocty;
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RemoteSection builtin;
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RemoteSection capture;
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RemoteSection typeref;
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RemoteSection reflstr;
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uintptr_t StartAddress;
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size_t TotalSize;
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} RemoteReflectionInfo;
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static void errorAndExit(const char *message) {
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fprintf(stderr, "%s\n", message);
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abort();
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}
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static void errnoAndExit(const char *message) {
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fprintf(stderr, "%s: %s\n", message, strerror(errno));
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abort();
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}
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#if 0
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#include <inttypes.h>
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#define DEBUG_LOG(fmt, ...) fprintf(stderr, "%s: " fmt "\n",\
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__func__, __VA_ARGS__)
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#else
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#define DEBUG_LOG(fmt, ...) (void)0
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#endif
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static const size_t ReadEnd = 0;
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static const size_t WriteEnd = 1;
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static
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int PipeMemoryReader_getParentReadFD(const PipeMemoryReader *Reader) {
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return Reader->from_child[ReadEnd];
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}
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static
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int PipeMemoryReader_getChildWriteFD(const PipeMemoryReader *Reader) {
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return Reader->from_child[WriteEnd];
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}
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static
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int PipeMemoryReader_getParentWriteFD(const PipeMemoryReader *Reader) {
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return Reader->to_child[WriteEnd];
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}
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static
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int PipeMemoryReader_getChildReadFD(const PipeMemoryReader *Reader) {
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return Reader->to_child[ReadEnd];
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}
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static
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uint8_t PipeMemoryReader_getPointerSize(void *Context) {
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return sizeof(uintptr_t);
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}
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static
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void PipeMemoryReader_collectBytesFromPipe(const PipeMemoryReader *Reader,
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void *Dest, size_t Size) {
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int ReadFD = PipeMemoryReader_getParentReadFD(Reader);
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while (Size) {
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int bytesRead = read(ReadFD, Dest, Size);
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if (bytesRead < 0)
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if (errno == EINTR)
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continue;
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else
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errnoAndExit("collectBytesFromPipe");
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else if (bytesRead == 0)
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errorAndExit("collectBytesFromPipe: Unexpected end of file");
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Size -= bytesRead;
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// Arithmetic on a void pointer is a GNU extension.
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Dest = (char*)(Dest) + bytesRead;
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}
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}
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static int PipeMemoryReader_queryDataLayout(void *Context,
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DataLayoutQueryType type,
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void *inBuffer, void *outBuffer) {
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switch (type) {
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case DLQ_GetPointerSize: {
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uint8_t *result = (uint8_t *)outBuffer;
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*result = sizeof(void *);
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return 1;
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}
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case DLQ_GetSizeSize: {
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uint8_t *result = (uint8_t *)outBuffer;
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*result = sizeof(size_t);
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return 1;
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}
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}
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return 0;
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}
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static void PipeMemoryReader_freeBytes(void *reader_context, const void *bytes,
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void *context) {
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free((void *)bytes);
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}
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static
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const void *PipeMemoryReader_readBytes(void *Context, swift_addr_t Address,
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uint64_t Size, void **outFreeContext) {
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const PipeMemoryReader *Reader = (const PipeMemoryReader *)Context;
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uintptr_t TargetAddress = Address;
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size_t TargetSize = (size_t)Size;
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DEBUG_LOG("Requesting read of %zu bytes from 0x%" PRIxPTR,
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TargetSize, TargetAddress);
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int WriteFD = PipeMemoryReader_getParentWriteFD(Reader);
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write(WriteFD, REQUEST_READ_BYTES, 2);
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write(WriteFD, &TargetAddress, sizeof(TargetAddress));
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write(WriteFD, &TargetSize, sizeof(size_t));
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void *Buf = malloc(Size);
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PipeMemoryReader_collectBytesFromPipe(Reader, Buf, Size);
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*outFreeContext = NULL;
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return Buf;
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}
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static
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swift_addr_t PipeMemoryReader_getSymbolAddress(void *Context,
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const char *SymbolName,
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uint64_t Length) {
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const PipeMemoryReader *Reader = (const PipeMemoryReader *)Context;
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uintptr_t Address = 0;
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DEBUG_LOG("Requesting address of symbol %s", SymbolName);
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int WriteFD = PipeMemoryReader_getParentWriteFD(Reader);
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write(WriteFD, REQUEST_SYMBOL_ADDRESS, 2);
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write(WriteFD, SymbolName, Length);
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write(WriteFD, "\n", 1);
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PipeMemoryReader_collectBytesFromPipe(Reader, (uint8_t*)&Address,
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sizeof(Address));
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DEBUG_LOG("Address of %s is 0x%" PRIxPTR, SymbolName, Address);
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return (uintptr_t)Address;
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}
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static InstanceKind
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PipeMemoryReader_receiveInstanceKind(const PipeMemoryReader *Reader) {
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int WriteFD = PipeMemoryReader_getParentWriteFD(Reader);
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write(WriteFD, REQUEST_INSTANCE_KIND, 2);
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uint8_t KindValue = 0;
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PipeMemoryReader_collectBytesFromPipe(Reader, &KindValue, sizeof(KindValue));
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DEBUG_LOG("Requested instance kind is %u", KindValue);
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return KindValue;
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}
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static uintptr_t
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PipeMemoryReader_receiveInstanceAddress(const PipeMemoryReader *Reader) {
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int WriteFD = PipeMemoryReader_getParentWriteFD(Reader);
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write(WriteFD, REQUEST_INSTANCE_ADDRESS, 2);
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uintptr_t InstanceAddress = 0;
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PipeMemoryReader_collectBytesFromPipe(Reader, (uint8_t *)&InstanceAddress,
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sizeof(InstanceAddress));
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DEBUG_LOG("Requested instance address is 0x%" PRIxPTR, InstanceAddress);
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return InstanceAddress;
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}
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static
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void PipeMemoryReader_sendDoneMessage(const PipeMemoryReader *Reader) {
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int WriteFD = PipeMemoryReader_getParentWriteFD(Reader);
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write(WriteFD, REQUEST_DONE, 2);
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}
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static
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PipeMemoryReader createPipeMemoryReader() {
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PipeMemoryReader Reader;
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#if defined(_WIN32)
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if (_pipe(Reader.to_child, 256, _O_BINARY))
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errnoAndExit("Couldn't create pipes to child process");
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if (_pipe(Reader.from_child, 256, _O_BINARY))
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errnoAndExit("Couldn't create pipes from child process");
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#else
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if (pipe(Reader.to_child))
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errnoAndExit("Couldn't create pipes to child process");
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if (pipe(Reader.from_child))
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errnoAndExit("Couldn't create pipes from child process");
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#endif
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return Reader;
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}
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#if defined(__APPLE__) && defined(__MACH__)
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static void
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PipeMemoryReader_receiveImages(SwiftReflectionContextRef RC,
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const PipeMemoryReader *Reader) {
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int WriteFD = PipeMemoryReader_getParentWriteFD(Reader);
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write(WriteFD, REQUEST_IMAGES, 2);
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size_t NumReflectionInfos;
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PipeMemoryReader_collectBytesFromPipe(Reader, &NumReflectionInfos,
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sizeof(NumReflectionInfos));
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DEBUG_LOG("Receiving %z images from child", NumReflectionInfos);
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if (NumReflectionInfos == 0)
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return;
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struct { uintptr_t Start, Size; } *Images;
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Images = calloc(NumReflectionInfos, sizeof(*Images));
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PipeMemoryReader_collectBytesFromPipe(Reader, Images,
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NumReflectionInfos * sizeof(*Images));
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for (size_t i = 0; i < NumReflectionInfos; ++i) {
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DEBUG_LOG("Adding image at 0x%" PRIxPTR, Images[i].Start);
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swift_reflection_addImage(RC, Images[i].Start);
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}
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free(Images);
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}
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#else
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static swift_reflection_section_t
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makeLocalSection(const void *Buffer, RemoteSection Section,
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RemoteReflectionInfo Info) {
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if (Section.Size == 0) {
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swift_reflection_section_t LS = {NULL, NULL};
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return LS;
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}
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uintptr_t Base
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= (uintptr_t)Buffer + Section.StartAddress - Info.StartAddress;
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swift_reflection_section_t LS = {
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(void *)Base,
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(void *)(Base + Section.Size)
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};
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return LS;
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}
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static
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uintptr_t getStartAddress(const RemoteSection Sections[], size_t Count) {
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uintptr_t Start = 0;
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for (size_t i = 0; i < Count; ++i) {
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if (Sections[i].StartAddress != 0) {
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if (Start != 0)
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Start = MIN(Start, Sections[i].StartAddress);
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else
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Start = Sections[i].StartAddress;
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}
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}
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return Start;
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}
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static
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uintptr_t getEndAddress(const RemoteSection Sections[], size_t Count) {
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uintptr_t End = 0;
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for (size_t i = 0; i < Count; ++i) {
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if (Sections[i].StartAddress != 0)
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End = MAX(End, Sections[i].EndAddress);
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}
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return End;
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}
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static
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RemoteReflectionInfo makeRemoteReflectionInfo(RemoteSection fieldmd,
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RemoteSection assocty,
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RemoteSection builtin,
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RemoteSection capture,
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RemoteSection typeref,
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RemoteSection reflstr) {
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RemoteReflectionInfo Info = {
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fieldmd,
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assocty,
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builtin,
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capture,
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typeref,
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reflstr,
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0,
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0
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};
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const RemoteSection Sections[6] = {
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fieldmd, assocty, builtin, capture, typeref, reflstr
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};
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Info.StartAddress = getStartAddress(Sections, 6);
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uintptr_t EndAddress = getEndAddress(Sections, 6);
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Info.TotalSize = EndAddress - Info.StartAddress;
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return Info;
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}
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static
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RemoteSection makeRemoteSection(const PipeMemoryReader *Reader) {
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uintptr_t Start;
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size_t Size;
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PipeMemoryReader_collectBytesFromPipe(Reader, &Start, sizeof(Start));
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PipeMemoryReader_collectBytesFromPipe(Reader, &Size, sizeof(Size));
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RemoteSection RS = {Start, Size, Start + Size};
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return RS;
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}
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static void
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PipeMemoryReader_receiveReflectionInfo(SwiftReflectionContextRef RC,
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const PipeMemoryReader *Reader) {
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int WriteFD = PipeMemoryReader_getParentWriteFD(Reader);
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write(WriteFD, REQUEST_REFLECTION_INFO, 2);
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size_t NumReflectionInfos;
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PipeMemoryReader_collectBytesFromPipe(Reader, &NumReflectionInfos,
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sizeof(NumReflectionInfos));
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if (NumReflectionInfos == 0)
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return;
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RemoteReflectionInfo *RemoteInfos = calloc(NumReflectionInfos,
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sizeof(RemoteReflectionInfo));
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if (RemoteInfos == NULL)
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errnoAndExit("malloc failed");
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for (size_t i = 0; i < NumReflectionInfos; ++i) {
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RemoteInfos[i] = makeRemoteReflectionInfo(
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makeRemoteSection(Reader),
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makeRemoteSection(Reader),
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makeRemoteSection(Reader),
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makeRemoteSection(Reader),
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makeRemoteSection(Reader),
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makeRemoteSection(Reader));
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}
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// Now pull in the remote sections into our address space.
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for (size_t i = 0; i < NumReflectionInfos; ++i) {
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RemoteReflectionInfo RemoteInfo = RemoteInfos[i];
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void *outFreeContext = NULL;
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const void *Buffer = PipeMemoryReader_readBytes((void *)Reader,
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RemoteInfo.StartAddress,
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RemoteInfo.TotalSize,
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&outFreeContext);
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if (!Buffer)
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errorAndExit("Couldn't read reflection information");
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swift_reflection_info_t Info = {
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{makeLocalSection(Buffer, RemoteInfo.fieldmd, RemoteInfo), 0},
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{makeLocalSection(Buffer, RemoteInfo.assocty, RemoteInfo), 0},
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{makeLocalSection(Buffer, RemoteInfo.builtin, RemoteInfo), 0},
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{makeLocalSection(Buffer, RemoteInfo.capture, RemoteInfo), 0},
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{makeLocalSection(Buffer, RemoteInfo.typeref, RemoteInfo), 0},
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{makeLocalSection(Buffer, RemoteInfo.reflstr, RemoteInfo), 0},
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/*LocalStartAddress*/ (uintptr_t) Buffer,
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/*RemoteStartAddress*/ RemoteInfo.StartAddress,
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};
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swift_reflection_addReflectionInfo(RC, Info);
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}
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free(RemoteInfos);
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}
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#endif
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uint64_t PipeMemoryReader_getStringLength(void *Context, swift_addr_t Address) {
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const PipeMemoryReader *Reader = (const PipeMemoryReader *)Context;
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int WriteFD = PipeMemoryReader_getParentWriteFD(Reader);
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uintptr_t TargetAddress = (uintptr_t)Address;
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write(WriteFD, REQUEST_STRING_LENGTH, 2);
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write(WriteFD, &TargetAddress, sizeof(TargetAddress));
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uintptr_t Length = 0;
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PipeMemoryReader_collectBytesFromPipe(Reader, &Length, sizeof(Length));
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return Length;
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}
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int reflectHeapObject(SwiftReflectionContextRef RC,
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const PipeMemoryReader Pipe) {
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uintptr_t instance = PipeMemoryReader_receiveInstanceAddress(&Pipe);
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if (instance == 0) {
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// Child has no more instances to examine
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PipeMemoryReader_sendDoneMessage(&Pipe);
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return 0;
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}
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printf("Instance pointer in child address space: 0x%lx\n",
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instance);
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swift_typeref_t TR = swift_reflection_typeRefForInstance(RC, instance);
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printf("Type reference:\n");
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swift_reflection_dumpTypeRef(TR);
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printf("\n");
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printf("Type info:\n");
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swift_reflection_dumpInfoForInstance(RC, instance);
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printf("\n");
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PipeMemoryReader_sendDoneMessage(&Pipe);
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return 1;
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}
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int reflectExistential(SwiftReflectionContextRef RC,
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const PipeMemoryReader Pipe,
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swift_typeref_t MockExistentialTR) {
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uintptr_t instance = PipeMemoryReader_receiveInstanceAddress(&Pipe);
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if (instance == 0) {
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// Child has no more instances to examine
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PipeMemoryReader_sendDoneMessage(&Pipe);
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return 0;
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}
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printf("Instance pointer in child address space: 0x%lx\n",
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instance);
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swift_typeref_t InstanceTypeRef;
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swift_addr_t StartOfInstanceData = 0;
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if (!swift_reflection_projectExistential(RC, instance, MockExistentialTR,
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&InstanceTypeRef,
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&StartOfInstanceData)) {
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printf("swift_reflection_projectExistential failed.\n");
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PipeMemoryReader_sendDoneMessage(&Pipe);
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return 0;
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}
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printf("Type reference:\n");
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swift_reflection_dumpTypeRef(InstanceTypeRef);
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printf("\n");
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printf("Type info:\n");
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swift_reflection_dumpInfoForTypeRef(RC, InstanceTypeRef);
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printf("\n");
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PipeMemoryReader_sendDoneMessage(&Pipe);
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return 1;
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}
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int doDumpHeapInstance(const char *BinaryFilename) {
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PipeMemoryReader Pipe = createPipeMemoryReader();
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#if defined(_WIN32)
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#else
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pid_t pid = _fork();
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switch (pid) {
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case -1:
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errnoAndExit("Couldn't fork child process");
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case 0: { // Child:
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close(PipeMemoryReader_getParentWriteFD(&Pipe));
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close(PipeMemoryReader_getParentReadFD(&Pipe));
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dup2(PipeMemoryReader_getChildReadFD(&Pipe), STDIN_FILENO);
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dup2(PipeMemoryReader_getChildWriteFD(&Pipe), STDOUT_FILENO);
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_execv(BinaryFilename, NULL);
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exit(EXIT_SUCCESS);
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}
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default: { // Parent
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close(PipeMemoryReader_getChildReadFD(&Pipe));
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close(PipeMemoryReader_getChildWriteFD(&Pipe));
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SwiftReflectionContextRef RC =
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swift_reflection_createReflectionContextWithDataLayout(
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(void *)&Pipe, PipeMemoryReader_queryDataLayout,
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PipeMemoryReader_freeBytes, PipeMemoryReader_readBytes,
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PipeMemoryReader_getStringLength,
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PipeMemoryReader_getSymbolAddress);
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uint8_t PointerSize = PipeMemoryReader_getPointerSize((void*)&Pipe);
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if (PointerSize != sizeof(uintptr_t))
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errorAndExit("Child process had unexpected architecture");
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#if defined(__APPLE__) && defined(__MACH__)
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PipeMemoryReader_receiveImages(RC, &Pipe);
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#else
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PipeMemoryReader_receiveReflectionInfo(RC, &Pipe);
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#endif
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while (1) {
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InstanceKind Kind = PipeMemoryReader_receiveInstanceKind(&Pipe);
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switch (Kind) {
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case Object:
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printf("Reflecting an object.\n");
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if (!reflectHeapObject(RC, Pipe))
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return EXIT_SUCCESS;
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break;
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case Existential: {
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static const char Name[] = MANGLING_PREFIX_STR "ypD";
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swift_typeref_t AnyTR
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= swift_reflection_typeRefForMangledTypeName(RC,
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|
Name, sizeof(Name)-1);
|
|
|
|
printf("Reflecting an existential.\n");
|
|
if (!reflectExistential(RC, Pipe, AnyTR))
|
|
return EXIT_SUCCESS;
|
|
break;
|
|
}
|
|
case ErrorExistential: {
|
|
static const char ErrorName[] = MANGLING_PREFIX_STR "s5Error_pD";
|
|
swift_typeref_t ErrorTR
|
|
= swift_reflection_typeRefForMangledTypeName(RC,
|
|
ErrorName, sizeof(ErrorName)-1);
|
|
printf("Reflecting an error existential.\n");
|
|
if (!reflectExistential(RC, Pipe, ErrorTR))
|
|
return EXIT_SUCCESS;
|
|
break;
|
|
}
|
|
case Closure:
|
|
printf("Reflecting a closure.\n");
|
|
if (!reflectHeapObject(RC, Pipe))
|
|
return EXIT_SUCCESS;
|
|
break;
|
|
case None:
|
|
swift_reflection_destroyReflectionContext(RC);
|
|
printf("Done.\n");
|
|
return EXIT_SUCCESS;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
#include <dlfcn.h>
|
|
static unsigned long long computeClassIsSwiftMask(void) {
|
|
uintptr_t *objc_debug_swift_stable_abi_bit_ptr =
|
|
(uintptr_t *)dlsym(RTLD_DEFAULT, "objc_debug_swift_stable_abi_bit");
|
|
return objc_debug_swift_stable_abi_bit_ptr ?
|
|
*objc_debug_swift_stable_abi_bit_ptr : 1;
|
|
}
|
|
#else
|
|
static unsigned long long computeClassIsSwiftMask(void) {
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
void printUsageAndExit() {
|
|
fprintf(stderr, "swift-reflection-test <binary filename>\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
if (argc != 2)
|
|
printUsageAndExit();
|
|
|
|
const char *BinaryFilename = argv[1];
|
|
|
|
// swift_reflection_classIsSwiftMask is weak linked so we can work
|
|
// with older Remote Mirror dylibs.
|
|
if (&swift_reflection_classIsSwiftMask != NULL)
|
|
swift_reflection_classIsSwiftMask = computeClassIsSwiftMask();
|
|
|
|
uint16_t Version = swift_reflection_getSupportedMetadataVersion();
|
|
printf("Metadata version: %u\n", Version);
|
|
|
|
return doDumpHeapInstance(BinaryFilename);
|
|
}
|