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REPL.cpp
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//===--- REPL.cpp - the integrated REPL -----------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/Immediate/Immediate.h"
#include "ImmediateImpl.h"
#include "swift/Config.h"
#include "swift/Subsystems.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/DiagnosticsFrontend.h"
#include "swift/AST/IRGenOptions.h"
#include "swift/AST/Module.h"
#include "swift/AST/NameLookup.h"
#include "swift/Basic/LLVMContext.h"
#include "swift/Frontend/Frontend.h"
#include "swift/IDE/REPLCodeCompletion.h"
#include "swift/IDE/Utils.h"
#include "swift/Parse/PersistentParserState.h"
#include "swift/SIL/SILModule.h"
#include "swift/SILOptimizer/PassManager/Passes.h"
#include "llvm/ExecutionEngine/MCJIT.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Constants.h"
#include "llvm/Transforms/Utils/Cloning.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Process.h"
#if HAVE_UNICODE_LIBEDIT
#include <histedit.h>
#include <wchar.h>
#endif
using namespace swift;
using namespace swift::immediate;
namespace {
class REPLContext {
public:
/// The SourceMgr buffer ID of the REPL input.
unsigned CurBufferID;
/// The index into the source file's Decls at which to start
/// typechecking the next REPL input.
unsigned CurElem;
/// The index into the source file's Decls at which to start
/// irgenning the next REPL input.
unsigned CurIRGenElem;
};
enum class REPLInputKind : int {
/// The REPL got a "quit" signal.
REPLQuit,
/// Empty whitespace-only input.
Empty,
/// A REPL directive, such as ':help'.
REPLDirective,
/// Swift source code.
SourceCode,
};
template<size_t N>
class ConvertForWcharSize;
template<>
class ConvertForWcharSize<2> {
public:
static llvm::ConversionResult ConvertFromUTF8(const char** sourceStart,
const char* sourceEnd,
wchar_t** targetStart,
wchar_t* targetEnd,
llvm::ConversionFlags flags) {
return ConvertUTF8toUTF16(reinterpret_cast<const llvm::UTF8**>(sourceStart),
reinterpret_cast<const llvm::UTF8*>(sourceEnd),
reinterpret_cast<llvm::UTF16**>(targetStart),
reinterpret_cast<llvm::UTF16*>(targetEnd),
flags);
}
static llvm::ConversionResult ConvertToUTF8(const wchar_t** sourceStart,
const wchar_t* sourceEnd,
char** targetStart,
char* targetEnd,
llvm::ConversionFlags flags) {
return ConvertUTF16toUTF8(
reinterpret_cast<const llvm::UTF16**>(sourceStart),
reinterpret_cast<const llvm::UTF16*>(sourceEnd),
reinterpret_cast<llvm::UTF8**>(targetStart),
reinterpret_cast<llvm::UTF8*>(targetEnd),
flags);
}
};
template<>
class ConvertForWcharSize<4> {
public:
static llvm::ConversionResult ConvertFromUTF8(const char** sourceStart,
const char* sourceEnd,
wchar_t** targetStart,
wchar_t* targetEnd,
llvm::ConversionFlags flags) {
return ConvertUTF8toUTF32(reinterpret_cast<const llvm::UTF8**>(sourceStart),
reinterpret_cast<const llvm::UTF8*>(sourceEnd),
reinterpret_cast<llvm::UTF32**>(targetStart),
reinterpret_cast<llvm::UTF32*>(targetEnd),
flags);
}
static llvm::ConversionResult ConvertToUTF8(const wchar_t** sourceStart,
const wchar_t* sourceEnd,
char** targetStart,
char* targetEnd,
llvm::ConversionFlags flags) {
return ConvertUTF32toUTF8(
reinterpret_cast<const llvm::UTF32**>(sourceStart),
reinterpret_cast<const llvm::UTF32*>(sourceEnd),
reinterpret_cast<llvm::UTF8**>(targetStart),
reinterpret_cast<llvm::UTF8*>(targetEnd),
flags);
}
};
using Convert = ConvertForWcharSize<sizeof(wchar_t)>;
#if HAVE_UNICODE_LIBEDIT
static void convertFromUTF8(llvm::StringRef utf8,
llvm::SmallVectorImpl<wchar_t> &out) {
size_t reserve = out.size() + utf8.size();
out.reserve(reserve);
const char *utf8_begin = utf8.begin();
wchar_t *wide_begin = out.end();
auto res = Convert::ConvertFromUTF8(&utf8_begin, utf8.end(),
&wide_begin, out.data() + reserve,
llvm::lenientConversion);
assert(res == llvm::conversionOK && "utf8-to-wide conversion failed!");
(void)res;
out.set_size(wide_begin - out.begin());
}
static void convertToUTF8(llvm::ArrayRef<wchar_t> wide,
llvm::SmallVectorImpl<char> &out) {
size_t reserve = out.size() + wide.size()*4;
out.reserve(reserve);
const wchar_t *wide_begin = wide.begin();
char *utf8_begin = out.end();
auto res = Convert::ConvertToUTF8(&wide_begin, wide.end(),
&utf8_begin, out.data() + reserve,
llvm::lenientConversion);
assert(res == llvm::conversionOK && "wide-to-utf8 conversion failed!");
(void)res;
out.set_size(utf8_begin - out.begin());
}
#endif
} // end anonymous namespace
#if HAVE_UNICODE_LIBEDIT
static bool appendToREPLFile(SourceFile &SF,
PersistentParserState &PersistentState,
REPLContext &RC,
std::unique_ptr<llvm::MemoryBuffer> Buffer) {
assert(SF.Kind == SourceFileKind::REPL && "Can't append to a non-REPL file");
SourceManager &SrcMgr = SF.getParentModule()->getASTContext().SourceMgr;
RC.CurBufferID = SrcMgr.addNewSourceBuffer(std::move(Buffer));
bool FoundAnySideEffects = false;
unsigned CurElem = RC.CurElem;
bool Done;
do {
FoundAnySideEffects |=
parseIntoSourceFile(SF, RC.CurBufferID, &Done, nullptr,
&PersistentState);
performTypeChecking(SF, PersistentState.getTopLevelContext(), None,
CurElem);
CurElem = SF.Decls.size();
} while (!Done);
return FoundAnySideEffects;
}
/// An arbitrary, otherwise-unused char value that editline interprets as
/// entering/leaving "literal mode", meaning it passes prompt characters through
/// to the terminal without affecting the line state. This prevents color
/// escape sequences from interfering with editline's internal state.
static constexpr wchar_t LITERAL_MODE_CHAR = L'\1';
/// Append a terminal escape sequence in "literal mode" so that editline
/// ignores it.
static void appendEscapeSequence(SmallVectorImpl<wchar_t> &dest,
llvm::StringRef src)
{
dest.push_back(LITERAL_MODE_CHAR);
convertFromUTF8(src, dest);
dest.push_back(LITERAL_MODE_CHAR);
}
/// The main REPL prompt string.
static const wchar_t * const PS1 = L"(swift) ";
/// The REPL prompt string for line continuations.
static const wchar_t * const PS2 = L" ";
class REPLInput;
class REPLEnvironment;
namespace {
/// Observe that we are processing REPL input. Dump source and reset any
/// colorization before dying.
class PrettyStackTraceREPL : public llvm::PrettyStackTraceEntry {
REPLInput &Input;
public:
PrettyStackTraceREPL(REPLInput &Input) : Input(Input) {}
void print(llvm::raw_ostream &out) const override;
};
} // end anonymous namespace
/// EditLine wrapper that implements the user interface behavior for reading
/// user input to the REPL. All of its methods must be usable from a separate
/// thread and so shouldn't touch anything outside of the EditLine, History,
/// and member object state.
///
/// FIXME: Need the module for completions! Currently REPLRunLoop uses
/// synchronous messaging between the REPLInput thread and the main thread,
/// and client code shouldn't have access to the AST, so only one thread will
/// be accessing the module at a time. However, if REPLRunLoop
/// (or a new REPL application) ever requires asynchronous messaging between
/// REPLInput and REPLEnvironment, or if client code expected to be able to
/// grovel into the REPL's AST, then locking will be necessary to serialize
/// access to the AST.
class REPLInput {
PrettyStackTraceREPL StackTrace;
EditLine *e;
HistoryW *h;
size_t PromptContinuationLevel;
bool NeedPromptContinuation;
bool ShowColors;
bool PromptedForLine;
bool Outdented;
REPLCompletions completions;
llvm::SmallVector<wchar_t, 80> PromptString;
/// A buffer for all lines that the user entered, but we have not parsed yet.
llvm::SmallString<128> CurrentLines;
llvm::SmallString<16> CodeCompletionErasedBytes;
public:
REPLEnvironment &Env;
bool Autoindent;
REPLInput(REPLEnvironment &env)
: StackTrace(*this), Env(env), Autoindent(true)
{
// Only show colors if both stderr and stdout have colors.
ShowColors = llvm::errs().has_colors() && llvm::outs().has_colors();
// Make sure the terminal color gets restored when the REPL is quit.
if (ShowColors)
atexit([] {
llvm::outs().resetColor();
llvm::errs().resetColor();
});
e = el_init("swift", stdin, stdout, stderr);
h = history_winit();
PromptContinuationLevel = 0;
el_wset(e, EL_EDITOR, L"emacs");
el_wset(e, EL_PROMPT_ESC, PromptFn, LITERAL_MODE_CHAR);
el_wset(e, EL_CLIENTDATA, (void*)this);
el_wset(e, EL_HIST, history, h);
el_wset(e, EL_SIGNAL, 1);
el_wset(e, EL_GETCFN, GetCharFn);
// Provide special outdenting behavior for '}' and ':'.
el_wset(e, EL_ADDFN, L"swift-close-brace", L"Reduce {} indentation level",
BindingFn<&REPLInput::onCloseBrace>);
el_wset(e, EL_BIND, L"}", L"swift-close-brace", nullptr);
el_wset(e, EL_ADDFN, L"swift-colon", L"Reduce label indentation level",
BindingFn<&REPLInput::onColon>);
el_wset(e, EL_BIND, L":", L"swift-colon", nullptr);
// Provide special indent/completion behavior for tab.
el_wset(e, EL_ADDFN, L"swift-indent-or-complete",
L"Indent line or trigger completion",
BindingFn<&REPLInput::onIndentOrComplete>);
el_wset(e, EL_BIND, L"\t", L"swift-indent-or-complete", nullptr);
el_wset(e, EL_ADDFN, L"swift-complete",
L"Trigger completion",
BindingFn<&REPLInput::onComplete>);
// Provide some common bindings to complement editline's defaults.
// ^W should delete previous word, not the entire line.
el_wset(e, EL_BIND, L"\x17", L"ed-delete-prev-word", nullptr);
// ^_ should undo.
el_wset(e, EL_BIND, L"\x1f", L"vi-undo", nullptr);
HistEventW ev;
history_w(h, &ev, H_SETSIZE, 800);
}
~REPLInput() {
if (ShowColors)
llvm::outs().resetColor();
// FIXME: This should not be needed, but seems to help when stdout is being
// redirected to a file. Perhaps there is some underlying editline bug
// where it is setting stdout into some weird state and not restoring it
// with el_end?
llvm::outs().flush();
fflush(stdout);
el_end(e);
}
SourceFile &getREPLInputFile();
REPLInputKind getREPLInput(SmallVectorImpl<char> &Result) {
ide::SourceCompleteResult SCR;
SCR.IsComplete = true;
unsigned CurChunkLines = 0;
wchar_t TotalLine[4096] = L"";
CurrentLines.clear();
// Reset color before showing the prompt.
if (ShowColors)
llvm::outs().resetColor();
do {
// Read one line.
PromptContinuationLevel = SCR.IndentLevel;
NeedPromptContinuation = !SCR.IsComplete;
PromptedForLine = false;
Outdented = false;
int LineCount;
size_t LineStart = CurrentLines.size();
const wchar_t* WLine = el_wgets(e, &LineCount);
if (!WLine) {
// End-of-file.
if (PromptedForLine)
llvm::outs() << "\n";
return REPLInputKind::REPLQuit;
}
if (Autoindent) {
size_t indent = PromptContinuationLevel*2;
CurrentLines.append(indent, ' ');
}
size_t WLineLength = wcslen(WLine);
convertToUTF8(llvm::makeArrayRef(WLine, WLine + WLineLength),
CurrentLines);
wcsncat(TotalLine, WLine, WLineLength);
++CurChunkLines;
// If we detect a line starting with a colon, treat it as a special
// REPL escape.
char const *s = CurrentLines.data() + LineStart;
char const *p = s;
while (p < CurrentLines.end() && isspace(*p)) {
++p;
}
if (p == CurrentLines.end()) {
if (!SCR.IsComplete) continue;
return REPLInputKind::Empty;
}
if (CurChunkLines == 1 && SCR.IndentLevel == 0 && *p == ':') {
// Colorize the response output.
if (ShowColors)
llvm::outs().changeColor(llvm::raw_ostream::GREEN);
Result.clear();
Result.append(CurrentLines.begin(), CurrentLines.end());
// The lexer likes null-terminated data.
Result.push_back('\0');
Result.pop_back();
// Enter the line into the line history.
HistEventW ev;
history_w(h, &ev, H_ENTER, TotalLine);
return REPLInputKind::REPLDirective;
}
SCR = ide::isSourceInputComplete(CurrentLines.str(), SourceFileKind::REPL);
// Keep reading if input is unfinished.
} while (!SCR.IsComplete);
// Enter the line into the line history.
HistEventW ev;
history_w(h, &ev, H_ENTER, TotalLine);
Result.clear();
Result.append(CurrentLines.begin(), CurrentLines.end());
// The lexer likes null-terminated data.
Result.push_back('\0');
Result.pop_back();
// Colorize the response output.
if (ShowColors)
llvm::outs().changeColor(llvm::raw_ostream::CYAN);
return REPLInputKind::SourceCode;
}
private:
static wchar_t *PromptFn(EditLine *e) {
void* clientdata;
el_wget(e, EL_CLIENTDATA, &clientdata);
return const_cast<wchar_t*>(((REPLInput*)clientdata)->getPrompt());
}
const wchar_t *getPrompt() {
PromptString.clear();
if (ShowColors) {
const char *colorCode =
llvm::sys::Process::OutputColor(llvm::raw_ostream::YELLOW,
false, false);
if (colorCode)
appendEscapeSequence(PromptString, colorCode);
}
if (!NeedPromptContinuation)
PromptString.insert(PromptString.end(), PS1, PS1 + wcslen(PS1));
else {
PromptString.insert(PromptString.end(), PS2, PS2 + wcslen(PS2));
if (Autoindent)
PromptString.append(2*PromptContinuationLevel, L' ');
}
if (ShowColors) {
const char *colorCode = llvm::sys::Process::ResetColor();
if (colorCode)
appendEscapeSequence(PromptString, colorCode);
}
PromptedForLine = true;
PromptString.push_back(L'\0');
return PromptString.data();
}
/// Custom GETCFN to reset completion state after typing.
static int GetCharFn(EditLine *e, wchar_t *out) {
void* clientdata;
el_wget(e, EL_CLIENTDATA, &clientdata);
REPLInput *that = (REPLInput*)clientdata;
wint_t c;
while (errno = 0, (c = getwc(stdin)) == WEOF) {
if (errno == EINTR)
continue;
*out = L'\0';
return feof(stdin) ? 0 : -1;
}
// If the user typed anything other than tab, reset the completion state.
if (c != L'\t') {
that->completions.reset();
that->CodeCompletionErasedBytes.clear();
}
*out = wchar_t(c);
return 1;
}
template<unsigned char (REPLInput::*method)(int)>
static unsigned char BindingFn(EditLine *e, int ch) {
void *clientdata;
el_wget(e, EL_CLIENTDATA, &clientdata);
return (((REPLInput*)clientdata)->*method)(ch);
}
bool isAtStartOfLine(const LineInfoW *line) {
for (wchar_t c : llvm::makeArrayRef(line->buffer,
line->cursor - line->buffer)) {
if (!iswspace(c))
return false;
}
return true;
}
// /^\s*\w+\s*:$/
bool lineLooksLikeLabel(const LineInfoW *line) {
const wchar_t *p = line->buffer;
while (p != line->cursor && iswspace(*p))
++p;
if (p == line->cursor)
return false;
do {
++p;
} while (p != line->cursor && (iswalnum(*p) || *p == L'_'));
while (p != line->cursor && iswspace(*p))
++p;
return p+1 == line->cursor || *p == L':';
}
// /^\s*set\s*\(.*\)\s*:$/
bool lineLooksLikeSetter(const LineInfoW *line) {
const wchar_t *p = line->buffer;
while (p != line->cursor && iswspace(*p))
++p;
if (p == line->cursor || *p++ != L's')
return false;
if (p == line->cursor || *p++ != L'e')
return false;
if (p == line->cursor || *p++ != L't')
return false;
while (p != line->cursor && iswspace(*p))
++p;
if (p == line->cursor || *p++ != L'(')
return false;
if (line->cursor - p < 2 || line->cursor[-1] != L':')
return false;
p = line->cursor - 1;
while (iswspace(*--p));
return *p == L')';
}
// /^\s*case.*:$/
bool lineLooksLikeCase(const LineInfoW *line) {
const wchar_t *p = line->buffer;
while (p != line->cursor && iswspace(*p))
++p;
if (p == line->cursor || *p++ != L'c')
return false;
if (p == line->cursor || *p++ != L'a')
return false;
if (p == line->cursor || *p++ != L's')
return false;
if (p == line->cursor || *p++ != L'e')
return false;
return line->cursor[-1] == ':';
}
void outdent() {
// If we didn't already outdent, do so.
if (!Outdented) {
if (PromptContinuationLevel > 0)
--PromptContinuationLevel;
Outdented = true;
}
}
unsigned char onColon(int ch) {
// Add the character to the string.
wchar_t s[2] = {(wchar_t)ch, 0};
el_winsertstr(e, s);
const LineInfoW *line = el_wline(e);
// Outdent if the line looks like a label.
if (lineLooksLikeLabel(line))
outdent();
// Outdent if the line looks like a setter.
else if (lineLooksLikeSetter(line))
outdent();
// Outdent if the line looks like a 'case' label.
else if (lineLooksLikeCase(line))
outdent();
return CC_REFRESH;
}
unsigned char onCloseBrace(int ch) {
bool atStart = isAtStartOfLine(el_wline(e));
// Add the character to the string.
wchar_t s[2] = {(wchar_t)ch, 0};
el_winsertstr(e, s);
// Don't outdent if we weren't at the start of the line.
if (!atStart) {
return CC_REFRESH;
}
outdent();
return CC_REFRESH;
}
unsigned char onIndentOrComplete(int ch) {
const LineInfoW *line = el_wline(e);
// FIXME: UTF-8? What's that?
size_t cursorPos = line->cursor - line->buffer;
// If there's nothing but whitespace before the cursor, indent to the next
// 2-character tab stop.
if (isAtStartOfLine(line)) {
const wchar_t *indent = cursorPos & 1 ? L" " : L" ";
el_winsertstr(e, indent);
return CC_REFRESH;
}
// Otherwise, look for completions.
return onComplete(ch);
}
void insertStringRef(StringRef s) {
if (s.empty())
return;
// Convert s to wchar_t* and null-terminate for el_winsertstr.
SmallVector<wchar_t, 64> TmpStr;
convertFromUTF8(s, TmpStr);
TmpStr.push_back(L'\0');
el_winsertstr(e, TmpStr.data());
}
void displayCompletions(llvm::ArrayRef<llvm::StringRef> list) {
// FIXME: Do the print-completions-below-the-prompt thing bash does.
llvm::outs() << '\n';
// Trim the completion list to the terminal size.
int lines_int = 0, columns_int = 0;
// NB: EL_GETTC doesn't work with el_wget (?!)
el_get(e, EL_GETTC, "li", &lines_int);
el_get(e, EL_GETTC, "co", &columns_int);
assert(lines_int > 0 && columns_int > 0 && "negative or zero screen size?!");
auto lines = size_t(lines_int), columns = size_t(columns_int);
size_t trimToColumns = columns > 2 ? columns - 2 : 0;
size_t trimmed = 0;
if (list.size() > lines - 1) {
size_t trimToLines = lines > 2 ? lines - 2 : 0;
trimmed = list.size() - trimToLines;
list = list.slice(0, trimToLines);
}
for (StringRef completion : list) {
if (completion.size() > trimToColumns)
completion = completion.slice(0, trimToColumns);
llvm::outs() << " " << completion << '\n';
}
if (trimmed > 0)
llvm::outs() << " (and " << trimmed << " more)\n";
}
unsigned char onComplete(int ch) {
const LineInfoW *line = el_wline(e);
llvm::ArrayRef<wchar_t> wprefix(line->buffer, line->cursor - line->buffer);
llvm::SmallString<64> Prefix;
Prefix.assign(CurrentLines);
convertToUTF8(wprefix, Prefix);
if (!completions) {
// If we aren't currently working with a completion set, generate one.
completions.populate(getREPLInputFile(), Prefix);
// Display the common root of the found completions and beep unless we
// found a unique one.
insertStringRef(completions.getRoot());
return completions.isUnique()
? CC_REFRESH
: CC_REFRESH_BEEP;
}
// Otherwise, advance through the completion state machine.
switch (completions.getState()) {
case CompletionState::CompletedRoot:
// We completed the root. Next step is to display the completion list.
displayCompletions(completions.getCompletionList());
completions.setState(CompletionState::DisplayedCompletionList);
return CC_REDISPLAY;
case CompletionState::DisplayedCompletionList: {
// Complete the next completion stem in the cycle.
const auto Last = completions.getPreviousStem();
el_wdeletestr(e, Last.InsertableString.size());
Prefix.resize(Prefix.size() - Last.InsertableString.size());
insertStringRef(CodeCompletionErasedBytes);
Prefix.append(CodeCompletionErasedBytes);
const auto Next = completions.getNextStem();
CodeCompletionErasedBytes.clear();
if (Next.NumBytesToErase != 0) {
CodeCompletionErasedBytes.assign(Prefix.end() - Next.NumBytesToErase, Prefix.end());
el_wdeletestr(e, Next.NumBytesToErase);
}
insertStringRef(Next.InsertableString);
return CC_REFRESH;
}
case CompletionState::Empty:
case CompletionState::Unique:
// We already provided a definitive completion--nothing else to do.
return CC_REFRESH_BEEP;
case CompletionState::Invalid:
llvm_unreachable("got an invalid completion set?!");
}
}
};
enum class PrintOrDump { Print, Dump };
static void printOrDumpDecl(Decl *d, PrintOrDump which) {
if (which == PrintOrDump::Print) {
d->print(llvm::outs());
llvm::outs() << '\n';
} else
d->dump(llvm::outs());
}
/// The compiler and execution environment for the REPL.
class REPLEnvironment {
CompilerInstance &CI;
public:
SourceFile &REPLInputFile;
private:
ProcessCmdLine CmdLine;
llvm::SmallPtrSet<swift::ModuleDecl *, 8> ImportedModules;
SmallVector<llvm::Function*, 8> InitFns;
bool RanGlobalInitializers;
llvm::LLVMContext &LLVMContext;
llvm::Module *Module;
llvm::StringSet<> FuncsAlreadyGenerated;
llvm::StringSet<> GlobalsAlreadyEmitted;
llvm::Module DumpModule;
llvm::SmallString<128> DumpSource;
llvm::ExecutionEngine *EE;
IRGenOptions IRGenOpts;
const SILOptions SILOpts;
REPLInput Input;
REPLContext RC;
PersistentParserState PersistentState;
private:
void stripPreviouslyGenerated(llvm::Module &M) {
for (auto &function : M.getFunctionList()) {
function.setVisibility(llvm::GlobalValue::DefaultVisibility);
if (FuncsAlreadyGenerated.count(function.getName()))
function.deleteBody();
else {
if (function.getName() != SWIFT_ENTRY_POINT_FUNCTION)
FuncsAlreadyGenerated.insert(function.getName());
}
}
for (auto &global : M.globals()) {
if (!global.hasName())
continue;
if (global.hasGlobalUnnamedAddr())
continue;
global.setVisibility(llvm::GlobalValue::DefaultVisibility);
if (!global.hasAvailableExternallyLinkage() &&
!global.hasAppendingLinkage() &&
!global.hasCommonLinkage()) {
if (GlobalsAlreadyEmitted.count(global.getName())) {
// Some targets don't support relative references to undefined
// symbols. Keep the local copy of an ODR symbol if it's used in
// a relative reference expression.
bool usedInRelativeReference = false;
if (global.hasLinkOnceODRLinkage()) {
for (auto user : global.users()) {
// A relative reference will look like sub (ptrtoint @Global, _)
auto expr = dyn_cast<llvm::ConstantExpr>(user);
if (!expr)
continue;
if (expr->getOpcode() != llvm::Instruction::PtrToInt)
continue;
for (auto exprUser : expr->users()) {
auto exprExpr = dyn_cast<llvm::ConstantExpr>(exprUser);
if (!exprExpr)
continue;
if (exprExpr->getOpcode() != llvm::Instruction::Sub)
continue;
if (exprExpr->getOperand(0) != expr)
continue;
usedInRelativeReference = true;
goto done;
}
}
}
done:
if (!usedInRelativeReference)
global.setInitializer(nullptr);
} else
GlobalsAlreadyEmitted.insert(global.getName());
global.setLinkage(llvm::GlobalValue::ExternalLinkage);
}
}
for (auto alias = M.alias_begin(); alias != M.alias_end();) {
alias->setVisibility(llvm::GlobalValue::DefaultVisibility);
if (!alias->hasAvailableExternallyLinkage() &&
!alias->hasAppendingLinkage() &&
!alias->hasCommonLinkage()) {
alias->setLinkage(llvm::GlobalValue::ExternalLinkage);
if (GlobalsAlreadyEmitted.count(alias->getName())) {
// Replace already-emitted aliases with external declarations.
SmallString<32> name = alias->getName();
alias->setName("");
auto external = new llvm::GlobalVariable(
M,
alias->getType()->getPointerElementType(),
/*isConstant*/ false,
alias->getLinkage(),
/*initializer*/ nullptr,
name);
alias->replaceAllUsesWith(external);
auto &aliasToRemove = *alias;
++alias;
aliasToRemove.eraseFromParent();
} else {
GlobalsAlreadyEmitted.insert(alias->getName());
++alias;
}
}
}
}
bool executeSwiftSource(llvm::StringRef Line, const ProcessCmdLine &CmdLine) {
// Parse the current line(s).
auto InputBuf = std::unique_ptr<llvm::MemoryBuffer>(
llvm::MemoryBuffer::getMemBufferCopy(Line, "<REPL Input>"));
bool ShouldRun = appendToREPLFile(REPLInputFile, PersistentState, RC,
std::move(InputBuf));
// SILGen the module and produce SIL diagnostics.
std::unique_ptr<SILModule> sil;
if (!CI.getASTContext().hadError()) {
sil = performSILGeneration(REPLInputFile, CI.getSILOptions(),
RC.CurIRGenElem);
runSILDiagnosticPasses(*sil);
runSILLoweringPasses(*sil);
}
if (CI.getASTContext().hadError()) {
if (CI.getDiags().hasFatalErrorOccurred())
return false;
CI.getASTContext().Diags.resetHadAnyError();
while (REPLInputFile.Decls.size() > RC.CurElem)
REPLInputFile.Decls.pop_back();
// FIXME: Handling of "import" declarations? Is there any other
// state which needs to be reset?
return true;
}
RC.CurElem = REPLInputFile.Decls.size();
DumpSource += Line;
// If we didn't see an expression, statement, or decl which might have
// side-effects, keep reading.
if (!ShouldRun)
return true;
const PrimarySpecificPaths PSPs =
CI.getPrimarySpecificPathsForAtMostOnePrimary();
// IRGen the current line(s).
// FIXME: We shouldn't need to use the global context here, but
// something is persisting across calls to performIRGeneration.
auto LineModule = performIRGeneration(
IRGenOpts, REPLInputFile, std::move(sil), "REPLLine", PSPs,
getGlobalLLVMContext(), RC.CurIRGenElem);
RC.CurIRGenElem = RC.CurElem;
if (CI.getASTContext().hadError())
return false;
// LineModule will get destroy by the following link process.
// Make a copy of it to be able to correct produce DumpModule.
std::unique_ptr<llvm::Module> SaveLineModule(CloneModule(*LineModule));
if (!linkLLVMModules(Module, std::move(LineModule))) {
return false;
}
std::unique_ptr<llvm::Module> NewModule(CloneModule(*Module));
Module->getFunction("main")->eraseFromParent();
stripPreviouslyGenerated(*NewModule);
if (!linkLLVMModules(&DumpModule, std::move(SaveLineModule))) {
return false;
}
llvm::Function *DumpModuleMain = DumpModule.getFunction("main");
DumpModuleMain->setName("repl.line");
if (IRGenImportedModules(CI, *NewModule, ImportedModules, InitFns,
IRGenOpts, SILOpts))
return false;
llvm::Module *TempModule = NewModule.get();
EE->addModule(std::move(NewModule));
EE->finalizeObject();
for (auto InitFn : InitFns)
EE->runFunctionAsMain(InitFn, CmdLine, nullptr);
InitFns.clear();
// FIXME: The way we do this is really ugly... we should be able to
// improve this.
if (!RanGlobalInitializers) {
EE->runStaticConstructorsDestructors(*TempModule, false);
RanGlobalInitializers = true;
}
llvm::Function *EntryFn = TempModule->getFunction("main");
EE->runFunctionAsMain(EntryFn, CmdLine, nullptr);
return true;
}
public:
REPLEnvironment(CompilerInstance &CI,
const ProcessCmdLine &CmdLine,
llvm::LLVMContext &LLVMCtx,
bool ParseStdlib)
: CI(CI),
REPLInputFile(CI.getMainModule()->
getMainSourceFile(SourceFileKind::REPL)),
CmdLine(CmdLine),
RanGlobalInitializers(false),
LLVMContext(LLVMCtx),
Module(new llvm::Module("REPL", LLVMContext)),
DumpModule("REPL", LLVMContext),
IRGenOpts(),
SILOpts(),
Input(*this),
RC{
/*BufferID*/ 0U,
/*CurElem*/ 0,
/*CurIRGenElem*/ 0
},
PersistentState(CI.getASTContext())
{
ASTContext &Ctx = CI.getASTContext();
if (!loadSwiftRuntime(Ctx.SearchPathOpts.RuntimeLibraryPath)) {
CI.getDiags().diagnose(SourceLoc(),
diag::error_immediate_mode_missing_stdlib);
return;
}
tryLoadLibraries(CI.getLinkLibraries(), Ctx.SearchPathOpts, CI.getDiags());
llvm::EngineBuilder builder{std::unique_ptr<llvm::Module>{Module}};
std::string ErrorMsg;
llvm::TargetOptions TargetOpt;
std::string CPU;
std::string Triple;
std::vector<std::string> Features;
std::tie(TargetOpt, CPU, Features, Triple)
= getIRTargetOptions(IRGenOpts, CI.getASTContext());
builder.setRelocationModel(llvm::Reloc::PIC_);
builder.setTargetOptions(TargetOpt);
builder.setMCPU(CPU);
builder.setMAttrs(Features);