llvm-project/clang/lib/Sema/CodeCompleteConsumer.cpp

672 lines
18 KiB
C++
Raw Normal View History

//===--- CodeCompleteConsumer.cpp - Code Completion Interface ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the CodeCompleteConsumer class.
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/CodeCompleteConsumer.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/Sema.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/Lex/Preprocessor.h"
#include "clang-c/Index.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstring>
#include <functional>
using namespace clang;
using llvm::StringRef;
//===----------------------------------------------------------------------===//
// Code completion context implementation
//===----------------------------------------------------------------------===//
bool CodeCompletionContext::wantConstructorResults() const {
switch (Kind) {
case CCC_Other:
case CCC_Statement:
case CCC_Expression:
case CCC_ObjCMessageReceiver:
case CCC_ParenthesizedExpression:
return true;
case CCC_TopLevel:
case CCC_ObjCInterface:
case CCC_ObjCImplementation:
case CCC_ObjCIvarList:
case CCC_ClassStructUnion:
case CCC_MemberAccess:
case CCC_EnumTag:
case CCC_UnionTag:
case CCC_ClassOrStructTag:
case CCC_ObjCProtocolName:
case CCC_Namespace:
case CCC_Type:
case CCC_Name:
case CCC_PotentiallyQualifiedName:
case CCC_MacroName:
case CCC_MacroNameUse:
case CCC_PreprocessorExpression:
case CCC_PreprocessorDirective:
case CCC_NaturalLanguage:
case CCC_SelectorName:
case CCC_TypeQualifiers:
return false;
}
return false;
}
//===----------------------------------------------------------------------===//
// Code completion string implementation
//===----------------------------------------------------------------------===//
CodeCompletionString::Chunk::Chunk(ChunkKind Kind, llvm::StringRef Text)
: Kind(Kind), Text("")
{
switch (Kind) {
case CK_TypedText:
case CK_Text:
case CK_Placeholder:
case CK_Informative:
case CK_ResultType:
case CK_CurrentParameter: {
char *New = new char [Text.size() + 1];
std::memcpy(New, Text.data(), Text.size());
New[Text.size()] = '\0';
this->Text = New;
break;
}
case CK_Optional:
llvm_unreachable("Optional strings cannot be created from text");
break;
case CK_LeftParen:
this->Text = "(";
break;
case CK_RightParen:
this->Text = ")";
break;
case CK_LeftBracket:
this->Text = "[";
break;
case CK_RightBracket:
this->Text = "]";
break;
case CK_LeftBrace:
this->Text = "{";
break;
case CK_RightBrace:
this->Text = "}";
break;
case CK_LeftAngle:
this->Text = "<";
break;
case CK_RightAngle:
this->Text = ">";
break;
case CK_Comma:
this->Text = ", ";
break;
case CK_Colon:
this->Text = ":";
break;
case CK_SemiColon:
this->Text = ";";
break;
case CK_Equal:
this->Text = " = ";
break;
case CK_HorizontalSpace:
this->Text = " ";
break;
case CK_VerticalSpace:
this->Text = "\n";
break;
}
}
CodeCompletionString::Chunk
CodeCompletionString::Chunk::CreateText(StringRef Text) {
return Chunk(CK_Text, Text);
}
CodeCompletionString::Chunk
CodeCompletionString::Chunk::CreateOptional(
std::auto_ptr<CodeCompletionString> Optional) {
Chunk Result;
Result.Kind = CK_Optional;
Result.Optional = Optional.release();
return Result;
}
CodeCompletionString::Chunk
CodeCompletionString::Chunk::CreatePlaceholder(StringRef Placeholder) {
return Chunk(CK_Placeholder, Placeholder);
}
CodeCompletionString::Chunk
CodeCompletionString::Chunk::CreateInformative(StringRef Informative) {
return Chunk(CK_Informative, Informative);
}
CodeCompletionString::Chunk
CodeCompletionString::Chunk::CreateResultType(StringRef ResultType) {
return Chunk(CK_ResultType, ResultType);
}
CodeCompletionString::Chunk
CodeCompletionString::Chunk::CreateCurrentParameter(
StringRef CurrentParameter) {
return Chunk(CK_CurrentParameter, CurrentParameter);
}
CodeCompletionString::Chunk CodeCompletionString::Chunk::Clone() const {
switch (Kind) {
case CK_TypedText:
case CK_Text:
case CK_Placeholder:
case CK_Informative:
case CK_ResultType:
case CK_CurrentParameter:
case CK_LeftParen:
case CK_RightParen:
case CK_LeftBracket:
case CK_RightBracket:
case CK_LeftBrace:
case CK_RightBrace:
case CK_LeftAngle:
case CK_RightAngle:
case CK_Comma:
case CK_Colon:
case CK_SemiColon:
case CK_Equal:
case CK_HorizontalSpace:
case CK_VerticalSpace:
return Chunk(Kind, Text);
case CK_Optional: {
std::auto_ptr<CodeCompletionString> Opt(Optional->Clone());
return CreateOptional(Opt);
}
}
// Silence GCC warning.
return Chunk();
}
void
CodeCompletionString::Chunk::Destroy() {
switch (Kind) {
case CK_Optional:
delete Optional;
break;
case CK_TypedText:
case CK_Text:
case CK_Placeholder:
case CK_Informative:
case CK_ResultType:
case CK_CurrentParameter:
delete [] Text;
break;
case CK_LeftParen:
case CK_RightParen:
case CK_LeftBracket:
case CK_RightBracket:
case CK_LeftBrace:
case CK_RightBrace:
case CK_LeftAngle:
case CK_RightAngle:
case CK_Comma:
case CK_Colon:
case CK_SemiColon:
case CK_Equal:
case CK_HorizontalSpace:
case CK_VerticalSpace:
break;
}
}
void CodeCompletionString::clear() {
std::for_each(Chunks.begin(), Chunks.end(),
std::mem_fun_ref(&Chunk::Destroy));
Chunks.clear();
}
std::string CodeCompletionString::getAsString() const {
std::string Result;
llvm::raw_string_ostream OS(Result);
for (iterator C = begin(), CEnd = end(); C != CEnd; ++C) {
switch (C->Kind) {
case CK_Optional: OS << "{#" << C->Optional->getAsString() << "#}"; break;
case CK_Placeholder: OS << "<#" << C->Text << "#>"; break;
case CK_Informative:
case CK_ResultType:
OS << "[#" << C->Text << "#]";
break;
case CK_CurrentParameter: OS << "<#" << C->Text << "#>"; break;
default: OS << C->Text; break;
}
}
return OS.str();
}
const char *CodeCompletionString::getTypedText() const {
for (iterator C = begin(), CEnd = end(); C != CEnd; ++C)
if (C->Kind == CK_TypedText)
return C->Text;
return 0;
}
CodeCompletionString *
CodeCompletionString::Clone(CodeCompletionString *Result) const {
if (!Result)
Result = new CodeCompletionString;
for (iterator C = begin(), CEnd = end(); C != CEnd; ++C)
Result->AddChunk(C->Clone());
return Result;
}
static void WriteUnsigned(llvm::raw_ostream &OS, unsigned Value) {
OS.write((const char *)&Value, sizeof(unsigned));
}
static bool ReadUnsigned(const char *&Memory, const char *MemoryEnd,
unsigned &Value) {
if (Memory + sizeof(unsigned) > MemoryEnd)
return true;
memmove(&Value, Memory, sizeof(unsigned));
Memory += sizeof(unsigned);
return false;
}
void CodeCompletionString::Serialize(llvm::raw_ostream &OS) const {
// Write the number of chunks.
WriteUnsigned(OS, size());
for (iterator C = begin(), CEnd = end(); C != CEnd; ++C) {
WriteUnsigned(OS, C->Kind);
switch (C->Kind) {
case CK_TypedText:
case CK_Text:
case CK_Placeholder:
case CK_Informative:
case CK_ResultType:
case CK_CurrentParameter: {
const char *Text = C->Text;
unsigned StrLen = strlen(Text);
WriteUnsigned(OS, StrLen);
OS.write(Text, StrLen);
break;
}
case CK_Optional:
C->Optional->Serialize(OS);
break;
case CK_LeftParen:
case CK_RightParen:
case CK_LeftBracket:
case CK_RightBracket:
case CK_LeftBrace:
case CK_RightBrace:
case CK_LeftAngle:
case CK_RightAngle:
case CK_Comma:
case CK_Colon:
case CK_SemiColon:
case CK_Equal:
case CK_HorizontalSpace:
case CK_VerticalSpace:
break;
}
}
}
bool CodeCompletionString::Deserialize(const char *&Str, const char *StrEnd) {
if (Str == StrEnd || *Str == 0)
return false;
unsigned NumBlocks;
if (ReadUnsigned(Str, StrEnd, NumBlocks))
return false;
for (unsigned I = 0; I != NumBlocks; ++I) {
if (Str + 1 >= StrEnd)
break;
// Parse the next kind.
unsigned KindValue;
if (ReadUnsigned(Str, StrEnd, KindValue))
return false;
switch (ChunkKind Kind = (ChunkKind)KindValue) {
case CK_TypedText:
case CK_Text:
case CK_Placeholder:
case CK_Informative:
case CK_ResultType:
case CK_CurrentParameter: {
unsigned StrLen;
if (ReadUnsigned(Str, StrEnd, StrLen) || (Str + StrLen > StrEnd))
return false;
AddChunk(Chunk(Kind, StringRef(Str, StrLen)));
Str += StrLen;
break;
}
case CK_Optional: {
std::auto_ptr<CodeCompletionString> Optional(new CodeCompletionString());
if (Optional->Deserialize(Str, StrEnd))
AddOptionalChunk(Optional);
break;
}
case CK_LeftParen:
case CK_RightParen:
case CK_LeftBracket:
case CK_RightBracket:
case CK_LeftBrace:
case CK_RightBrace:
case CK_LeftAngle:
case CK_RightAngle:
case CK_Comma:
case CK_Colon:
case CK_SemiColon:
case CK_Equal:
case CK_HorizontalSpace:
case CK_VerticalSpace:
AddChunk(Chunk(Kind));
break;
}
};
return true;
}
void CodeCompletionResult::Destroy() {
if (Kind == RK_Pattern) {
delete Pattern;
Pattern = 0;
}
}
unsigned CodeCompletionResult::getPriorityFromDecl(NamedDecl *ND) {
if (!ND)
return CCP_Unlikely;
// Context-based decisions.
DeclContext *DC = ND->getDeclContext()->getRedeclContext();
if (DC->isFunctionOrMethod() || isa<BlockDecl>(DC)) {
// _cmd is relatively rare
if (ImplicitParamDecl *ImplicitParam = dyn_cast<ImplicitParamDecl>(ND))
if (ImplicitParam->getIdentifier() &&
ImplicitParam->getIdentifier()->isStr("_cmd"))
return CCP_ObjC_cmd;
return CCP_LocalDeclaration;
}
if (DC->isRecord() || isa<ObjCContainerDecl>(DC))
return CCP_MemberDeclaration;
// Content-based decisions.
if (isa<EnumConstantDecl>(ND))
return CCP_Constant;
if (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND))
return CCP_Type;
return CCP_Declaration;
}
//===----------------------------------------------------------------------===//
// Code completion overload candidate implementation
//===----------------------------------------------------------------------===//
FunctionDecl *
CodeCompleteConsumer::OverloadCandidate::getFunction() const {
if (getKind() == CK_Function)
return Function;
else if (getKind() == CK_FunctionTemplate)
return FunctionTemplate->getTemplatedDecl();
else
return 0;
}
const FunctionType *
CodeCompleteConsumer::OverloadCandidate::getFunctionType() const {
switch (Kind) {
case CK_Function:
return Function->getType()->getAs<FunctionType>();
case CK_FunctionTemplate:
return FunctionTemplate->getTemplatedDecl()->getType()
->getAs<FunctionType>();
case CK_FunctionType:
return Type;
}
return 0;
}
//===----------------------------------------------------------------------===//
// Code completion consumer implementation
//===----------------------------------------------------------------------===//
CodeCompleteConsumer::~CodeCompleteConsumer() { }
void
PrintingCodeCompleteConsumer::ProcessCodeCompleteResults(Sema &SemaRef,
CodeCompletionContext Context,
CodeCompletionResult *Results,
unsigned NumResults) {
std::stable_sort(Results, Results + NumResults);
// Print the results.
for (unsigned I = 0; I != NumResults; ++I) {
OS << "COMPLETION: ";
switch (Results[I].Kind) {
case CodeCompletionResult::RK_Declaration:
OS << Results[I].Declaration;
if (Results[I].Hidden)
OS << " (Hidden)";
if (CodeCompletionString *CCS
= Results[I].CreateCodeCompletionString(SemaRef)) {
OS << " : " << CCS->getAsString();
delete CCS;
}
OS << '\n';
break;
case CodeCompletionResult::RK_Keyword:
OS << Results[I].Keyword << '\n';
break;
case CodeCompletionResult::RK_Macro: {
OS << Results[I].Macro->getName();
if (CodeCompletionString *CCS
= Results[I].CreateCodeCompletionString(SemaRef)) {
OS << " : " << CCS->getAsString();
delete CCS;
}
OS << '\n';
break;
}
case CodeCompletionResult::RK_Pattern: {
OS << "Pattern : "
<< Results[I].Pattern->getAsString() << '\n';
break;
}
}
}
}
void
PrintingCodeCompleteConsumer::ProcessOverloadCandidates(Sema &SemaRef,
unsigned CurrentArg,
OverloadCandidate *Candidates,
unsigned NumCandidates) {
for (unsigned I = 0; I != NumCandidates; ++I) {
if (CodeCompletionString *CCS
= Candidates[I].CreateSignatureString(CurrentArg, SemaRef)) {
OS << "OVERLOAD: " << CCS->getAsString() << "\n";
delete CCS;
}
}
}
void CodeCompletionResult::computeCursorKindAndAvailability() {
switch (Kind) {
case RK_Declaration:
// Set the availability based on attributes.
Availability = CXAvailability_Available;
if (Declaration->getAttr<UnavailableAttr>())
Availability = CXAvailability_NotAvailable;
else if (Declaration->getAttr<DeprecatedAttr>())
Availability = CXAvailability_Deprecated;
if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Declaration))
if (Function->isDeleted())
Availability = CXAvailability_NotAvailable;
CursorKind = getCursorKindForDecl(Declaration);
if (CursorKind == CXCursor_UnexposedDecl)
CursorKind = CXCursor_NotImplemented;
break;
case RK_Macro:
Availability = CXAvailability_Available;
CursorKind = CXCursor_MacroDefinition;
break;
case RK_Keyword:
Availability = CXAvailability_Available;
CursorKind = CXCursor_NotImplemented;
break;
case RK_Pattern:
// Do nothing: Patterns can come with cursor kinds!
break;
}
}
/// \brief Retrieve the name that should be used to order a result.
///
/// If the name needs to be constructed as a string, that string will be
/// saved into Saved and the returned StringRef will refer to it.
static llvm::StringRef getOrderedName(const CodeCompletionResult &R,
std::string &Saved) {
switch (R.Kind) {
case CodeCompletionResult::RK_Keyword:
return R.Keyword;
case CodeCompletionResult::RK_Pattern:
return R.Pattern->getTypedText();
case CodeCompletionResult::RK_Macro:
return R.Macro->getName();
case CodeCompletionResult::RK_Declaration:
// Handle declarations below.
break;
}
DeclarationName Name = R.Declaration->getDeclName();
// If the name is a simple identifier (by far the common case), or a
// zero-argument selector, just return a reference to that identifier.
if (IdentifierInfo *Id = Name.getAsIdentifierInfo())
return Id->getName();
if (Name.isObjCZeroArgSelector())
if (IdentifierInfo *Id
= Name.getObjCSelector().getIdentifierInfoForSlot(0))
return Id->getName();
Saved = Name.getAsString();
return Saved;
}
bool clang::operator<(const CodeCompletionResult &X,
const CodeCompletionResult &Y) {
std::string XSaved, YSaved;
llvm::StringRef XStr = getOrderedName(X, XSaved);
llvm::StringRef YStr = getOrderedName(Y, YSaved);
int cmp = XStr.compare_lower(YStr);
if (cmp)
return cmp < 0;
// If case-insensitive comparison fails, try case-sensitive comparison.
cmp = XStr.compare(YStr);
if (cmp)
return cmp < 0;
return false;
}
void
CIndexCodeCompleteConsumer::ProcessCodeCompleteResults(Sema &SemaRef,
CodeCompletionContext Context,
CodeCompletionResult *Results,
unsigned NumResults) {
// Print the results.
for (unsigned I = 0; I != NumResults; ++I) {
WriteUnsigned(OS, Results[I].CursorKind);
WriteUnsigned(OS, Results[I].Priority);
WriteUnsigned(OS, Results[I].Availability);
CodeCompletionString *CCS = Results[I].CreateCodeCompletionString(SemaRef);
assert(CCS && "No code-completion string?");
CCS->Serialize(OS);
delete CCS;
}
}
void
CIndexCodeCompleteConsumer::ProcessOverloadCandidates(Sema &SemaRef,
unsigned CurrentArg,
OverloadCandidate *Candidates,
unsigned NumCandidates) {
for (unsigned I = 0; I != NumCandidates; ++I) {
WriteUnsigned(OS, CXCursor_NotImplemented);
WriteUnsigned(OS, /*Priority=*/I);
WriteUnsigned(OS, /*Availability=*/CXAvailability_Available);
CodeCompletionString *CCS
= Candidates[I].CreateSignatureString(CurrentArg, SemaRef);
assert(CCS && "No code-completion string?");
CCS->Serialize(OS);
delete CCS;
}
}