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ASTDumper.cpp
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//===--- ASTDumper.cpp - Swift Language AST Dumper ------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 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
//
//===----------------------------------------------------------------------===//
//
// This file implements dumping for the Swift ASTs.
//
//===----------------------------------------------------------------------===//
#include "swift/AST/ASTDumper.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/ASTPrinter.h"
#include "swift/AST/ASTVisitor.h"
#include "swift/AST/Attr.h"
#include "swift/AST/AutoDiff.h"
#include "swift/AST/AvailabilitySpec.h"
#include "swift/AST/ClangModuleLoader.h"
#include "swift/AST/ForeignAsyncConvention.h"
#include "swift/AST/ForeignErrorConvention.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/Initializer.h"
#include "swift/AST/PackConformance.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/AST/SourceFile.h"
#include "swift/AST/TypeCheckRequests.h"
#include "swift/AST/TypeVisitor.h"
#include "swift/AST/USRGeneration.h"
#include "swift/Basic/Assertions.h"
#include "swift/Basic/Defer.h"
#include "swift/Basic/QuotedString.h"
#include "swift/Basic/STLExtras.h"
#include "swift/Basic/SourceLoc.h"
#include "swift/Basic/SourceManager.h"
#include "swift/Basic/StringExtras.h"
#include "clang/AST/Type.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/JSON.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/SaveAndRestore.h"
#include "llvm/Support/raw_ostream.h"
#include <optional>
//
// AST DUMPING TIPS
// ================
//
// * Pass values before names (because names are often optional and can be
// omitted or empty).
//
// * Put all `printField*()` and `printFlag*()` calls before `printRec()` calls.
// `printRec()` variants print a child node, and all fields of the current
// node need to be printed before any child node is printed.
//
// * `printField()` expects a "simple" argument that will be converted to a
// keyword string by passing it through `getDumpString()`. For values that are
// at all complicated, use `printFieldQuoted()`, which will automatically
// quote and escape the value.
//
// * Confine all direct formatting for the console (e.g. printing quotes or
// parentheses) in `PrintBase`. Eventually we want to allow e.g. JSON dumping;
// limiting the amount of direct I/O helps us with that.
//
using namespace swift;
struct TerminalColor {
llvm::raw_ostream::Colors Color;
bool Bold;
};
#define DEF_COLOR(NAME, COLOR, BOLD) \
static const TerminalColor NAME##Color = { llvm::raw_ostream::COLOR, BOLD };
DEF_COLOR(Func, YELLOW, false)
DEF_COLOR(Range, YELLOW, false)
DEF_COLOR(AccessLevel, YELLOW, false)
DEF_COLOR(ASTNode, YELLOW, true)
DEF_COLOR(Parameter, YELLOW, false)
DEF_COLOR(Extension, MAGENTA, false)
DEF_COLOR(Pattern, RED, true)
DEF_COLOR(Override, RED, false)
DEF_COLOR(Stmt, RED, true)
DEF_COLOR(Captures, RED, false)
DEF_COLOR(Arguments, RED, false)
DEF_COLOR(TypeRepr, GREEN, false)
DEF_COLOR(LiteralValue, GREEN, false)
DEF_COLOR(Decl, GREEN, true)
DEF_COLOR(Parenthesis, BLUE, false)
DEF_COLOR(Type, BLUE, false)
DEF_COLOR(Discriminator, BLUE, false)
DEF_COLOR(InterfaceType, GREEN, false)
DEF_COLOR(Identifier, GREEN, false)
DEF_COLOR(Expr, MAGENTA, true)
DEF_COLOR(ExprModifier, CYAN, false)
DEF_COLOR(DeclModifier, CYAN, false)
DEF_COLOR(ArgModifier, CYAN, false)
DEF_COLOR(ClosureModifier, CYAN, false)
DEF_COLOR(DeclAttribute, CYAN, false)
DEF_COLOR(FieldLabel, CYAN, false)
DEF_COLOR(Location, CYAN, false)
#undef DEF_COLOR
namespace {
/// RAII object that prints with the given color, if color is supported on the
/// given stream.
class PrintWithColorRAII {
raw_ostream &OS;
bool ShowColors;
public:
PrintWithColorRAII(raw_ostream &os, TerminalColor color)
: OS(os), ShowColors(false)
{
ShowColors = os.has_colors();
if (ShowColors)
OS.changeColor(color.Color, color.Bold);
}
~PrintWithColorRAII() {
if (ShowColors) {
OS.resetColor();
}
}
raw_ostream &getOS() const { return OS; }
template<typename T>
friend raw_ostream &operator<<(PrintWithColorRAII &&printer,
const T &value){
printer.OS << value;
return printer.OS;
}
};
/// Wraps a \c raw_ostream so that anything printed through it is automatically
/// escaped appropriately for a double-quoted string.
class escaping_ostream : public raw_ostream {
raw_ostream &base_os;
public:
escaping_ostream(raw_ostream &base_os)
: raw_ostream(/*unbuffered=*/true), base_os(base_os)
{}
virtual ~escaping_ostream() {}
virtual void reserveExtraSpace(uint64_t ExtraSize) override {
base_os.reserveExtraSpace(ExtraSize);
}
virtual raw_ostream &changeColor(enum Colors Color, bool Bold = false,
bool BG = false) override {
return base_os.changeColor(Color, Bold, BG);
}
virtual raw_ostream &resetColor() override {
return base_os.resetColor();
}
virtual raw_ostream &reverseColor() override {
return base_os.reverseColor();
}
virtual bool is_displayed() const override {
return base_os.is_displayed();
}
virtual bool has_colors() const override {
return base_os.has_colors();
}
virtual void enable_colors(bool enable) override {
base_os.enable_colors(enable);
}
private:
virtual void write_impl(const char *Ptr, size_t Size) override {
writeEscaped(StringRef(Ptr, Size), base_os);
}
virtual uint64_t current_pos() const override {
return base_os.tell();
}
virtual void anchor() override {}
};
/// Returns the USR of the given declaration. Gracefully returns an empty
/// string if D is null or invalid.
std::string declUSR(const Decl *D) {
if (!D)
return "";
// Certain local synthesized declarations won't be assigned a local
// discriminator, later causing an assertion if we try to generate a USR
// for them. Avoid these.
// FIXME: USR generation should probably do a better job of avoiding the
// asserting code path?
if (auto VD = dyn_cast<ValueDecl>(D);
VD && VD->getDeclContext()->isLocalContext() &&
(!VD->getLoc().isValid() ||
(VD->getModuleContext()
->getSourceFileContainingLocation(VD->getLoc())
->getFulfilledMacroRole() == std::nullopt))) {
return "";
}
std::string usr;
llvm::raw_string_ostream os(usr);
if (swift::ide::printDeclUSR(D, os))
return "";
return usr;
}
/// Returns the USR of the given type. Gracefully returns an empty string
/// if the type is invalid.
std::string typeUSR(Type type) {
if (!type)
return "";
if (type->hasArchetype()) {
// We can't generate USRs for types that contain archetypes. Replace them
// with their interface types.
type = type.transformRec([&](TypeBase *t) -> std::optional<Type> {
if (auto AT = dyn_cast<ArchetypeType>(t)) {
return AT->getInterfaceType();
}
return std::nullopt;
});
}
std::string usr;
llvm::raw_string_ostream os(usr);
if (swift::ide::printTypeUSR(type, os))
return "";
return usr;
}
/// Returns the USR of the given value declaration's type. Gracefully returns
/// the empty string if D is null.
std::string declTypeUSR(const ValueDecl *D) {
if (!D)
return "";
std::string usr;
llvm::raw_string_ostream os(usr);
if (swift::ide::printDeclTypeUSR(D, os))
return "";
return usr;
}
} // end anonymous namespace
static StringRef getDumpString(SILFunctionType::Representation value) {
switch (value) {
case SILFunctionType::Representation::Thick: return "thick";
case SILFunctionType::Representation::Block: return "block";
case SILFunctionType::Representation::CFunctionPointer: return "c";
case SILFunctionType::Representation::CXXMethod:
return "cxx_method";
case SILFunctionType::Representation::Thin: return "thin";
case SILFunctionType::Representation::Method: return "method";
case SILFunctionType::Representation::ObjCMethod: return "objc_method";
case SILFunctionType::Representation::WitnessMethod: return "witness_method";
case SILFunctionType::Representation::Closure: return "closure";
case SILFunctionType::Representation::KeyPathAccessorGetter:
return "keypath_accessor_getter";
case SILFunctionType::Representation::KeyPathAccessorSetter:
return "keypath_accessor_setter";
case SILFunctionType::Representation::KeyPathAccessorEquals:
return "keypath_accessor_equals";
case SILFunctionType::Representation::KeyPathAccessorHash:
return "keypath_accessor_hash";
}
llvm_unreachable("Unhandled SILFunctionTypeRepresentation in switch.");
}
static StringRef getDumpString(ReadImplKind kind) {
switch (kind) {
case ReadImplKind::Stored:
return "stored";
case ReadImplKind::Inherited:
return "inherited";
case ReadImplKind::Get:
return "getter";
case ReadImplKind::Address:
return "addressor";
case ReadImplKind::Read:
return "read_coroutine";
case ReadImplKind::Read2:
return "read2_coroutine";
}
llvm_unreachable("bad kind");
}
static StringRef getDumpString(WriteImplKind kind) {
switch (kind) {
case WriteImplKind::Immutable:
return "immutable";
case WriteImplKind::Stored:
return "stored";
case WriteImplKind::StoredWithObservers:
return "stored_with_observers";
case WriteImplKind::InheritedWithObservers:
return "inherited_with_observers";
case WriteImplKind::Set:
return "setter";
case WriteImplKind::MutableAddress:
return "mutable_addressor";
case WriteImplKind::Modify:
return "modify_coroutine";
case WriteImplKind::Modify2:
return "modify2_coroutine";
}
llvm_unreachable("bad kind");
}
static StringRef getDumpString(ReadWriteImplKind kind) {
switch (kind) {
case ReadWriteImplKind::Immutable:
return "immutable";
case ReadWriteImplKind::Stored:
return "stored";
case ReadWriteImplKind::MutableAddress:
return "mutable_addressor";
case ReadWriteImplKind::MaterializeToTemporary:
return "materialize_to_temporary";
case ReadWriteImplKind::Modify:
return "modify_coroutine";
case ReadWriteImplKind::Modify2:
return "modify2_coroutine";
case ReadWriteImplKind::StoredWithDidSet:
return "stored_with_didset";
case ReadWriteImplKind::InheritedWithDidSet:
return "inherited_with_didset";
}
llvm_unreachable("bad kind");
}
static StringRef getDumpString(ImportKind value) {
switch (value) {
case ImportKind::Module: return "module";
case ImportKind::Type: return "type";
case ImportKind::Struct: return "struct";
case ImportKind::Class: return "class";
case ImportKind::Enum: return "enum";
case ImportKind::Protocol: return "protocol";
case ImportKind::Var: return "var";
case ImportKind::Func: return "func";
}
llvm_unreachable("Unhandled ImportKind in switch.");
}
static StringRef getDumpString(ForeignErrorConvention::Kind value) {
switch (value) {
case ForeignErrorConvention::ZeroResult: return "ZeroResult";
case ForeignErrorConvention::NonZeroResult: return "NonZeroResult";
case ForeignErrorConvention::ZeroPreservedResult: return "ZeroPreservedResult";
case ForeignErrorConvention::NilResult: return "NilResult";
case ForeignErrorConvention::NonNilError: return "NonNilError";
}
llvm_unreachable("Unhandled ForeignErrorConvention in switch.");
}
static StringRef getDumpString(DefaultArgumentKind value) {
switch (value) {
case DefaultArgumentKind::None: return "none";
#define MAGIC_IDENTIFIER(NAME, STRING) \
case DefaultArgumentKind::NAME: return STRING;
#include "swift/AST/MagicIdentifierKinds.def"
case DefaultArgumentKind::Inherited: return "inherited";
case DefaultArgumentKind::NilLiteral: return "nil";
case DefaultArgumentKind::EmptyArray: return "[]";
case DefaultArgumentKind::EmptyDictionary: return "[:]";
case DefaultArgumentKind::Normal: return "normal";
case DefaultArgumentKind::StoredProperty: return "stored property";
case DefaultArgumentKind::ExpressionMacro:
return "expression macro";
}
llvm_unreachable("Unhandled DefaultArgumentKind in switch.");
}
static StringRef getDumpString(ObjCSelectorExpr::ObjCSelectorKind value) {
switch (value) {
case ObjCSelectorExpr::Method: return "method";
case ObjCSelectorExpr::Getter: return "getter";
case ObjCSelectorExpr::Setter: return "setter";
}
llvm_unreachable("Unhandled ObjCSelectorExpr in switch.");
}
static StringRef getDumpString(AccessSemantics value) {
switch (value) {
case AccessSemantics::Ordinary: return "ordinary";
case AccessSemantics::DirectToStorage: return "direct_to_storage";
case AccessSemantics::DirectToImplementation: return "direct_to_impl";
case AccessSemantics::DistributedThunk: return "distributed_thunk";
}
llvm_unreachable("Unhandled AccessSemantics in switch.");
}
static StringRef getDumpString(MetatypeRepresentation value) {
switch (value) {
case MetatypeRepresentation::Thin: return "thin";
case MetatypeRepresentation::Thick: return "thick";
case MetatypeRepresentation::ObjC: return "@objc";
}
llvm_unreachable("Unhandled MetatypeRepresentation in switch.");
}
static StringRef getDumpString(StringLiteralExpr::Encoding value) {
switch (value) {
case StringLiteralExpr::UTF8: return "utf8";
case StringLiteralExpr::OneUnicodeScalar: return "unicodeScalar";
}
llvm_unreachable("Unhandled StringLiteral in switch.");
}
static StringRef getDumpString(CtorInitializerKind value) {
switch (value) {
case CtorInitializerKind::Designated: return "designated";
case CtorInitializerKind::Convenience: return "convenience";
case CtorInitializerKind::ConvenienceFactory: return "convenience_factory";
case CtorInitializerKind::Factory: return "factory";
}
llvm_unreachable("Unhandled CtorInitializerKind in switch.");
}
static StringRef getDumpString(Associativity value) {
switch (value) {
case Associativity::None: return "none";
case Associativity::Left: return "left";
case Associativity::Right: return "right";
}
llvm_unreachable("Unhandled Associativity in switch.");
}
static StringRef getDumpString(CheckedCastKind kind) {
return getCheckedCastKindName(kind);
}
static StringRef getDumpString(bool value) {
return value ? "true" : "false";
}
static StringRef getDumpString(AccessLevel level) {
return getAccessLevelSpelling(level);
}
static StringRef getDumpString(LifetimeAnnotation lifetime) {
switch (lifetime) {
case LifetimeAnnotation::EagerMove:
return "_eagerMove";
case LifetimeAnnotation::Lexical:
return "_lexical";
case LifetimeAnnotation::None:
return "";
}
llvm_unreachable("Unhandled LifetimeAnnotation in switch.");
}
static StringRef getDumpString(AccessorKind kind) {
return getAccessorKindString(kind);
}
static StringRef getDumpString(MagicIdentifierLiteralExpr::Kind kind) {
return MagicIdentifierLiteralExpr::getKindString(kind);
}
static StringRef getDumpString(ObjectLiteralExpr::LiteralKind kind) {
return ObjectLiteralExpr::getLiteralKindPlainName(kind);
}
static StringRef getDumpString(ParamSpecifier specifier) {
return ParamDecl::getSpecifierSpelling(specifier);
}
static StringRef getDumpString(ValueOwnership ownership) {
switch (ownership) {
case ValueOwnership::Default:
return "";
case ValueOwnership::Owned:
return "owned";
case ValueOwnership::Shared:
return "shared";
case ValueOwnership::InOut:
return "inout";
}
llvm_unreachable("Unhandled ValueOwnership in switch.");
}
static StringRef getDumpString(PlatformKind kind) {
return platformString(kind);
}
static StringRef getDumpString(ForeignErrorConvention::IsOwned_t owned) {
switch (owned) {
case swift::ForeignErrorConvention::IsNotOwned:
return "unowned";
case swift::ForeignErrorConvention::IsOwned:
return "owned";
}
llvm_unreachable("Unhandled ForeignErrorConvention::IsOwned_t in switch.");
}
static StringRef getDumpString(RequirementKind kind) {
switch (kind) {
case RequirementKind::SameShape: return "same_shape";
case RequirementKind::Conformance: return "conforms_to";
case RequirementKind::Layout: return "has_layout";
case RequirementKind::Superclass: return "subclass_of";
case RequirementKind::SameType: return "same_type";
}
llvm_unreachable("Unhandled RequirementKind in switch.");
}
static StringRef getDumpString(RequirementReprKind kind) {
switch (kind) {
case RequirementReprKind::TypeConstraint: return "type_constraint";
case RequirementReprKind::SameType: return "same_type";
case RequirementReprKind::LayoutConstraint: return "layout_constraint";
}
llvm_unreachable("Unhandled RequirementKind in switch.");
}
static StringRef getDumpString(ClangImporterSynthesizedTypeAttr::Kind kind) {
switch (kind) {
case ClangImporterSynthesizedTypeAttr::Kind::NSErrorWrapper:
return "NSErrorWrapper";
case ClangImporterSynthesizedTypeAttr::Kind::NSErrorWrapperAnon:
return "NSErrorWrapperAnon";
}
llvm_unreachable("unhandled ClangImporterSynthesizedTypeAttr::Kind");
}
static StringRef getDumpString(ExternKind kind) {
switch (kind) {
case ExternKind::C:
return "C";
case ExternKind::Wasm:
return "Wasm";
}
llvm_unreachable("unhandled ExternKind");
}
static StringRef getDumpString(InlineKind kind) {
switch (kind) {
case InlineKind::Always:
return "always";
case InlineKind::Never:
return "never";
}
llvm_unreachable("unhandled InlineKind");
}
static StringRef getDumpString(MacroRole role) {
return getMacroRoleString(role);
}
static StringRef getDumpString(EffectsKind kind) {
switch (kind) {
case EffectsKind::ReadNone:
return "ReadNone";
case EffectsKind::ReadOnly:
return "ReadOnly";
case EffectsKind::ReleaseNone:
return "ReleaseNone";
case EffectsKind::ReadWrite:
return "ReadWrite";
case EffectsKind::Unspecified:
return "Unspecified";
case EffectsKind::Custom:
return "Custom";
}
llvm_unreachable("unhandled EffectsKind");
}
static StringRef getDumpString(ExclusivityAttr::Mode mode) {
switch (mode) {
case ExclusivityAttr::Mode::Checked:
return "checked";
case ExclusivityAttr::Mode::Unchecked:
return "unchecked";
}
llvm_unreachable("unhandled ExclusivityAttr::Mode");
}
static StringRef getDumpString(OptimizationMode mode) {
switch (mode) {
case OptimizationMode::NotSet:
return "<not set>";
case OptimizationMode::NoOptimization:
return "NoOptimization";
case OptimizationMode::ForSpeed:
return "ForSpeed";
case OptimizationMode::ForSize:
return "ForSize";
}
}
static StringRef getDumpString(NonSendableKind kind) {
switch (kind) {
case NonSendableKind::Assumed:
return "Assumed";
case NonSendableKind::Specific:
return "Specific";
}
}
static StringRef getDumpString(FunctionRefInfo::ApplyLevel applyLevel) {
switch (applyLevel) {
case FunctionRefInfo::ApplyLevel::Unapplied:
return "unapplied";
case FunctionRefInfo::ApplyLevel::SingleApply:
return "single_apply";
case FunctionRefInfo::ApplyLevel::DoubleApply:
return "double_apply";
}
}
static StringRef getDumpString(ExecutionKind kind) {
switch (kind) {
case ExecutionKind::Concurrent:
return "concurrent";
case ExecutionKind::Caller:
return "caller";
}
}
static StringRef getDumpString(ExplicitSafety safety) {
switch (safety) {
case ExplicitSafety::Unspecified:
return "unspecified";
case ExplicitSafety::Safe:
return "safe";
case ExplicitSafety::Unsafe:
return "unsafe";
}
}
static StringRef getDumpString(StringRef s) {
return s;
}
static unsigned getDumpString(unsigned value) {
return value;
}
static size_t getDumpString(size_t value) {
return value;
}
static void *getDumpString(void *value) { return value; }
static StringRef getDumpString(Identifier ident) { return ident.str(); }
//===----------------------------------------------------------------------===//
// Decl printing.
//===----------------------------------------------------------------------===//
// Print a name.
static void printName(raw_ostream &os, DeclName name) {
if (!name)
os << "<anonymous>";
else
os << name;
}
static Type defaultGetTypeOfExpr(Expr *E) { return E->getType(); }
static Type defaultGetTypeOfKeyPathComponent(KeyPathExpr *E, unsigned index) {
return E->getComponents()[index].getComponentType();
}
using VisitedConformances = llvm::SmallPtrSetImpl<const ProtocolConformance *>;
namespace {
/// Represents a label attached to some data in the AST being dumped.
///
/// This type exists to balance the simplified S-expression output with
/// the need for additional structure in more complex data formats like
/// JSON. The S-expression output, in most cases, prints nested data as
/// unlabeled children (indented one more step) and allows fields to be
/// printed without explicit names, but this isn't compatible with JSON where
/// each value needs its own unique label/key (or it needs to be an element
/// of an array).
class Label {
StringRef Text;
bool IsOptional;
Label(StringRef text, bool isOptional)
: Text(text), IsOptional(isOptional) {}
public:
/// Returns a new label that is always printed, even in the default
/// (S-expression) output.
static Label always(StringRef text) {
return Label(text, /*isOptional=*/ false);
}
/// Returns a new label that is optional on output formats that allow
/// labels to be omitted.
static Label optional(StringRef text) {
return Label(text, /*isOptional=*/ true);
}
/// Returns true if the label's text is empty.
bool empty() const { return Text.empty(); }
/// Returns true if the label can be omitted by output formats that support
/// optional labels.
bool isOptional() const { return IsOptional; }
/// Returns the label's text.
StringRef text() const { return Text; }
};
/// Defines the interface for low-level printing operations that take place
/// when dumping a Swift AST.
class PrintWriterBase {
protected:
/// Only used by the S-expression writer to change the dumper to use
/// single quotes when printing substitution maps in full.
char Quote = '\"';
/// Tracks the source buffer ID of the main source file, which subclasses
/// can use to distinguish ranges/locations in that file vs. ranges in other
/// buffers, like macro expansions.
unsigned MainBufferID;
public:
virtual ~PrintWriterBase() {}
char quote() const { return Quote; }
void setQuote(char quote) { Quote = quote; }
void setMainBufferID(unsigned bufferID) { MainBufferID = bufferID; }
/// Call `body` in a context where the printer is ready for a child to be
/// printed.
virtual void printRecArbitrary(std::function<void(Label)> body,
Label label) = 0;
/// Print a range of nodes as a single "array" child node.
virtual void printRecRange(std::function<void()> body,
Label label) = 0;
/// Call `body` in a context where the printer is ready for a list of
/// children to be printed.
virtual void printListArbitrary(std::function<void()> body, Label label) = 0;
/// Print the beginning of a new node, including its type and an optional
/// label for it.
virtual void printHead(StringRef name, TerminalColor color, Label label) = 0;
/// Print the end of a new node.
virtual void printFoot() = 0;
/// Print a field with a short keyword-style value, printing the value by
/// passing a closure that takes a \c raw_ostream.
virtual void printFieldRaw(std::function<void(llvm::raw_ostream &)> body,
Label label, TerminalColor color) = 0;
/// Print a field with a long value that will be automatically quoted and
/// escaped, printing the value by passing a closure that takes a
/// \c raw_ostream.
virtual void printFieldQuotedRaw(
std::function<void(llvm::raw_ostream &)> body, Label name,
TerminalColor color) = 0;
/// Print a simple boolean value, printing the value by passing a closure
/// that takes a \c raw_ostream.
virtual void printFlagRaw(std::function<void(llvm::raw_ostream &)> body,
TerminalColor color) = 0;
/// Print a field containing a node's source location.
virtual void printSourceLoc(const SourceLoc L, const ASTContext *Ctx,
Label label) = 0;
/// Print a field containing a node's source range.
virtual void printSourceRange(const SourceRange R, const ASTContext *Ctx,
Label label) = 0;
virtual bool hasNonStandardOutput() const = 0;
/// Indicates whether the output format is meant to be parsable. Parsable
/// output should use structure rather than stringification to convey
/// detailed information, and generally provides more information than the
/// non-parsable formats, which are usually meant for human debugging.
virtual bool isParsable() const = 0;
};
/// Implements the default (pseudo-S-expression) output format for `-dump-ast`.
class DefaultWriter : public PrintWriterBase {
raw_ostream &OS;
unsigned Indent;
public:
DefaultWriter(raw_ostream &os, unsigned indent) : OS(os), Indent(indent) {}
void printRecArbitrary(std::function<void(Label)> body,
Label label) override {
Indent += 2;
OS << '\n';
body(label);
Indent -= 2;
}
void printRecRange(std::function<void()> body,
Label label) override {
printRecArbitrary([&](Label label) {
printHead("array", ASTNodeColor, label);
body();
printFoot();
}, label);
}
void printListArbitrary(std::function<void()> body, Label label) override {
// This writer ignores the label and simply prints the list directly
// underneath its parent.
body();
}
void printHead(StringRef name, TerminalColor color, Label label) override {
OS.indent(Indent);
PrintWithColorRAII(OS, ParenthesisColor) << '(';
if (!label.isOptional() && !label.empty()) {
PrintWithColorRAII(OS, FieldLabelColor) << label.text();
OS << "=";
}
PrintWithColorRAII(OS, color) << name;
}
void printFoot() override {
PrintWithColorRAII(OS, ParenthesisColor) << ')';
}
void printFieldRaw(std::function<void(llvm::raw_ostream &)> body,
Label label, TerminalColor color) override {
OS << " ";
if (!label.isOptional() && !label.empty())
PrintWithColorRAII(OS, color) << label.text() << "=";
std::string value;
llvm::raw_string_ostream SOS(value);
body(SOS);
PrintWithColorRAII(OS, color) << value;
}
void printFieldQuotedRaw(std::function<void(llvm::raw_ostream &)> body,
Label name, TerminalColor color) override {
printFieldRaw([&](raw_ostream &OS) {
OS << Quote;
{ escaping_ostream escOS(OS); body(escOS); }
OS << Quote;
}, name, color);
}
void printFlagRaw(std::function<void(llvm::raw_ostream &)> body,
TerminalColor color) override {
printFieldRaw(body, Label::always(""), color);
}
void printSourceLoc(const SourceLoc L, const ASTContext *Ctx,
Label label) override {
printFieldRaw([&](raw_ostream &OS) {
escaping_ostream escOS(OS);
L.print(escOS, Ctx->SourceMgr);
}, label, LocationColor);
}
void printSourceRange(const SourceRange R, const ASTContext *Ctx,
Label label) override {
printFieldRaw([&](raw_ostream &OS) {
escaping_ostream escOS(OS);
R.print(escOS, Ctx->SourceMgr, /*PrintText=*/false);
}, label, RangeColor);
}
bool hasNonStandardOutput() const override {
return &OS != &llvm::errs() && &OS != &llvm::dbgs();
}
bool isParsable() const override { return false; }
};
/// Implements JSON formatted output for `-ast-dump`.
class JSONWriter : public PrintWriterBase {
llvm::json::OStream OS;
std::vector<bool> InObjectStack;
public:
JSONWriter(raw_ostream &os, unsigned indent = 0) : OS(os, indent) {}
void printRecArbitrary(std::function<void(Label)> body,
Label label) override {
// The label is ignored if we're not printing inside an object (meaning
// we must be in an array).
assert(!InObjectStack.empty() && "printHead or printListArbitrary not called before printRecArbitrary");
if (InObjectStack.back()) {
OS.attributeBegin(label.text());
body(Label::optional(""));
OS.attributeEnd();
} else {
body(Label::optional(""));
}
}
void printRecRange(std::function<void()> body, Label label) override {
printListArbitrary([&]{ body(); }, label);
}
void printListArbitrary(std::function<void()> body, Label label) override {
OS.attributeBegin(label.text());
OS.arrayBegin();
InObjectStack.push_back(false);
body();
InObjectStack.pop_back();
OS.arrayEnd();
OS.attributeEnd();
}
void printHead(StringRef name, TerminalColor color, Label label) override {
OS.objectBegin();
InObjectStack.push_back(true);
OS.attribute(label.empty() ? "_kind" : label.text(), name);
}
void printFoot() override {
InObjectStack.pop_back();
OS.objectEnd();
}
void printFieldRaw(std::function<void(llvm::raw_ostream &)> body,
Label label, TerminalColor color) override {
std::string value;
llvm::raw_string_ostream SOS(value);
body(SOS);
// The label is ignored if we're not printing inside an object (meaning
// we must be in an array).
if (InObjectStack.back()) {
OS.attribute(label.text(), value);
} else {
OS.value(value);
}
}
void printFieldQuotedRaw(std::function<void(llvm::raw_ostream &)> body,
Label label, TerminalColor color) override {
// No need to do special quoting for complex values; the JSON output
// stream will do this for us.
printFieldRaw(body, label, color);
}
void printFlagRaw(std::function<void(llvm::raw_ostream &)> body,
TerminalColor color) override {
std::string flag;
llvm::raw_string_ostream SOS(flag);
body(SOS);
OS.attribute(flag, true);
}
void printSourceLoc(const SourceLoc L, const ASTContext *Ctx,
Label label) override {
// For compactness, we only print source ranges in JSON, since they
// provide a superset of this information.
}
void printSourceRange(const SourceRange R, const ASTContext *Ctx,
Label label) override {
OS.attributeBegin(label.text());
OS.objectBegin();
SourceManager &srcMgr = Ctx->SourceMgr;
unsigned startBufferID = srcMgr.findBufferContainingLoc(R.Start);
unsigned startOffset = srcMgr.getLocOffsetInBuffer(R.Start,
startBufferID);
OS.attribute("start", startOffset);
unsigned endBufferID = srcMgr.findBufferContainingLoc(R.End);
unsigned endOffset = srcMgr.getLocOffsetInBuffer(R.End, endBufferID);
OS.attribute("end", endOffset);
// Only print the buffer ID when it doesn't match the main ID, so that we
// distinguish macro expansions but don't bloat the output with the main
// file name repeated over and over.
if (startBufferID != MainBufferID)
OS.attribute("buffer_id", srcMgr.getIdentifierForBuffer(startBufferID));
OS.objectEnd();
OS.attributeEnd();
}
bool hasNonStandardOutput() const override { return true; }
bool isParsable() const override { return true; }
};
/// PrintBase - Base type for recursive structured dumps of AST nodes.
///
/// Please keep direct I/O, especially of structural elements like
/// parentheses and quote marks, confined to this base class. This will help
/// if we eventually support alternate output formats for AST dumps.
class PrintBase {
protected:
PrintWriterBase &Writer;
public: