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carbon-lang/toolchain/sem_ir/formatter.cpp
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Richard Smith 4e5dccdbf7 When making a direct call to a thunk, inline the call in SemIR. (#5642) 
This preserves the constant values of the arguments to the thunk, which
is important if the thunk requires conversion of an `IntLiteral` to some
other type. This should become unnecessary once we have form support,
but avoiding the indirection through a thunk function seems valuable
even once that support is in place.

To support this, track whether a function is a thunk on the Function
object, and if so, what the callee of the thunk is. This information is
also included in formatted SemIR when dumping the thunk.
2025-06-11 21:34:01 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "toolchain/sem_ir/formatter.h"
#include <string>
#include <utility>
#include "common/ostream.h"
#include "llvm/ADT/Sequence.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/SaveAndRestore.h"
#include "toolchain/base/fixed_size_value_store.h"
#include "toolchain/base/kind_switch.h"
#include "toolchain/base/shared_value_stores.h"
#include "toolchain/lex/tokenized_buffer.h"
#include "toolchain/parse/tree.h"
#include "toolchain/parse/tree_and_subtrees.h"
#include "toolchain/sem_ir/builtin_function_kind.h"
#include "toolchain/sem_ir/constant.h"
#include "toolchain/sem_ir/entity_with_params_base.h"
#include "toolchain/sem_ir/expr_info.h"
#include "toolchain/sem_ir/function.h"
#include "toolchain/sem_ir/ids.h"
#include "toolchain/sem_ir/name_scope.h"
#include "toolchain/sem_ir/typed_insts.h"
// TODO: Consider addressing recursion here, although it's not critical because
// the formatter isn't required to work on arbitrary code. Still, it may help
// in the future to debug complex code.
// NOLINTBEGIN(misc-no-recursion)
namespace Carbon::SemIR {
Formatter::Formatter(const File* sem_ir,
Parse::GetTreeAndSubtreesFn get_tree_and_subtrees,
llvm::ArrayRef<bool> include_ir_in_dumps,
bool use_dump_sem_ir_ranges)
: sem_ir_(sem_ir),
inst_namer_(sem_ir_),
get_tree_and_subtrees_(get_tree_and_subtrees),
include_ir_in_dumps_(include_ir_in_dumps),
use_dump_sem_ir_ranges_(use_dump_sem_ir_ranges),
// Create a placeholder visible chunk and assign it to all instructions
// that don't have a chunk of their own.
tentative_inst_chunks_(sem_ir_->insts(), AddChunkNoFlush(true)) {
if (use_dump_sem_ir_ranges_) {
ComputeNodeParents();
}
// Create empty placeholder chunks for instructions that we output lazily.
for (auto inst_id : llvm::concat<const InstId>(
sem_ir_->constants().array_ref(),
sem_ir_->inst_blocks().Get(InstBlockId::Imports))) {
tentative_inst_chunks_.Set(inst_id, AddChunkNoFlush(false));
}
// Create a real chunk for the start of the output.
AddChunkNoFlush(true);
}
auto Formatter::Format() -> void {
out_ << "--- " << sem_ir_->filename() << "\n";
FormatTopLevelScopeIfUsed(InstNamer::ScopeId::Constants,
sem_ir_->constants().array_ref(),
/*use_tentative_output_scopes=*/true);
FormatTopLevelScopeIfUsed(InstNamer::ScopeId::Imports,
sem_ir_->inst_blocks().Get(InstBlockId::Imports),
/*use_tentative_output_scopes=*/true);
FormatTopLevelScopeIfUsed(
InstNamer::ScopeId::File,
sem_ir_->inst_blocks().GetOrEmpty(sem_ir_->top_inst_block_id()),
/*use_tentative_output_scopes=*/false);
for (auto [id, _] : sem_ir_->interfaces().enumerate()) {
FormatInterface(id);
}
for (auto [id, _] : sem_ir_->associated_constants().enumerate()) {
FormatAssociatedConstant(id);
}
for (auto [id, _] : sem_ir_->impls().enumerate()) {
FormatImpl(id);
}
for (auto [id, _] : sem_ir_->classes().enumerate()) {
FormatClass(id);
}
for (auto [id, _] : sem_ir_->functions().enumerate()) {
FormatFunction(id);
}
for (auto [id, _] : sem_ir_->specifics().enumerate()) {
FormatSpecific(id);
}
out_ << "\n";
}
auto Formatter::ComputeNodeParents() -> void {
CARBON_CHECK(!node_parents_);
node_parents_ = NodeParentStore::MakeWithExplicitSize(
sem_ir_->parse_tree().size(), Parse::NodeId::None);
for (auto n : sem_ir_->parse_tree().postorder()) {
for (auto child : get_tree_and_subtrees_().children(n)) {
node_parents_->Set(child, n);
}
}
}
auto Formatter::Write(llvm::raw_ostream& out) -> void {
FlushChunk();
for (const auto& chunk : output_chunks_) {
if (chunk.include_in_output) {
out << chunk.chunk;
}
}
}
auto Formatter::FlushChunk() -> void {
CARBON_CHECK(output_chunks_.back().chunk.empty());
output_chunks_.back().chunk = std::move(buffer_);
buffer_.clear();
}
auto Formatter::AddChunkNoFlush(bool include_in_output) -> size_t {
CARBON_CHECK(buffer_.empty());
output_chunks_.push_back({.include_in_output = include_in_output});
return output_chunks_.size() - 1;
}
auto Formatter::AddChunk(bool include_in_output) -> size_t {
FlushChunk();
return AddChunkNoFlush(include_in_output);
}
auto Formatter::IncludeChunkInOutput(size_t chunk) -> void {
if (chunk == output_chunks_.size() - 1) {
return;
}
if (auto& current_chunk = output_chunks_.back();
!current_chunk.include_in_output) {
current_chunk.dependencies.push_back(chunk);
return;
}
llvm::SmallVector<size_t> to_add = {chunk};
while (!to_add.empty()) {
auto& chunk = output_chunks_[to_add.pop_back_val()];
if (chunk.include_in_output) {
continue;
}
chunk.include_in_output = true;
to_add.append(chunk.dependencies);
chunk.dependencies.clear();
}
}
auto Formatter::ShouldIncludeInstByIR(InstId inst_id) -> bool {
const auto* import_ir = GetCanonicalFileAndInstId(sem_ir_, inst_id).first;
return include_ir_in_dumps_[import_ir->check_ir_id().index];
}
// Returns true for a `DefinitionStart` node.
static auto IsDefinitionStart(Parse::NodeKind node_kind) -> bool {
switch (node_kind) {
case Parse::NodeKind::BuiltinFunctionDefinitionStart:
case Parse::NodeKind::ChoiceDefinitionStart:
case Parse::NodeKind::ClassDefinitionStart:
case Parse::NodeKind::FunctionDefinitionStart:
case Parse::NodeKind::ImplDefinitionStart:
case Parse::NodeKind::InterfaceDefinitionStart:
case Parse::NodeKind::NamedConstraintDefinitionStart:
return true;
default:
return false;
}
}
auto Formatter::ShouldFormatEntity(InstId decl_id) -> bool {
if (!decl_id.has_value()) {
return true;
}
if (!ShouldIncludeInstByIR(decl_id)) {
return false;
}
if (!use_dump_sem_ir_ranges_) {
return true;
}
// When there are dump ranges, ignore imported instructions.
auto loc_id = sem_ir_->insts().GetCanonicalLocId(decl_id);
if (loc_id.kind() != LocId::Kind::NodeId) {
return false;
}
const auto& tree_and_subtrees = get_tree_and_subtrees_();
// This takes the earliest token from either the node or its first postorder
// child. The first postorder child isn't necessarily the earliest token in
// the subtree (for example, it can miss modifiers), but finding the earliest
// token requires walking *all* children, whereas this approach is
// constant-time.
auto begin_node_id = *tree_and_subtrees.postorder(loc_id.node_id()).begin();
// Non-defining declarations will be associated with a `Decl` node.
// Definitions will have a `DefinitionStart` for which we can use the parent
// to find the `Definition`, giving a range that includes the definition's
// body.
auto end_node_id = loc_id.node_id();
if (IsDefinitionStart(sem_ir_->parse_tree().node_kind(end_node_id))) {
end_node_id = node_parents_->Get(end_node_id);
}
Lex::InclusiveTokenRange range = {
.begin = sem_ir_->parse_tree().node_token(begin_node_id),
.end = sem_ir_->parse_tree().node_token(end_node_id)};
return sem_ir_->parse_tree().tokens().OverlapsWithDumpSemIRRange(range);
}
auto Formatter::ShouldFormatEntity(const EntityWithParamsBase& entity) -> bool {
return ShouldFormatEntity(entity.latest_decl_id());
}
auto Formatter::ShouldFormatInst(InstId inst_id) -> bool {
if (!use_dump_sem_ir_ranges_) {
return true;
}
// When there are dump ranges, ignore imported instructions.
auto loc_id = sem_ir_->insts().GetCanonicalLocId(inst_id);
if (loc_id.kind() != LocId::Kind::NodeId) {
return false;
}
auto token = sem_ir_->parse_tree().node_token(loc_id.node_id());
return sem_ir_->parse_tree().tokens().OverlapsWithDumpSemIRRange(
Lex::InclusiveTokenRange{.begin = token, .end = token});
}
auto Formatter::OpenBrace() -> void {
// Put the constant value of an instruction before any braced block, rather
// than at the end.
FormatPendingConstantValue(AddSpace::After);
// Put the imported-from library name before the definition of the entity.
FormatPendingImportedFrom(AddSpace::After);
out_ << '{';
indent_ += 2;
after_open_brace_ = true;
}
auto Formatter::CloseBrace() -> void {
indent_ -= 2;
if (!after_open_brace_) {
Indent();
}
out_ << '}';
after_open_brace_ = false;
}
auto Formatter::Semicolon() -> void {
FormatPendingImportedFrom(AddSpace::Before);
out_ << ';';
}
auto Formatter::Indent(int offset) -> void {
if (after_open_brace_) {
out_ << '\n';
after_open_brace_ = false;
}
out_.indent(indent_ + offset);
}
auto Formatter::IndentLabel() -> void {
CARBON_CHECK(indent_ >= 2);
if (!after_open_brace_) {
out_ << '\n';
}
Indent(-2);
}
auto Formatter::FormatTopLevelScopeIfUsed(InstNamer::ScopeId scope_id,
llvm::ArrayRef<InstId> block,
bool use_tentative_output_scopes)
-> void {
if (!use_tentative_output_scopes && use_dump_sem_ir_ranges_) {
// Don't format the scope if no instructions are in a dump range.
block = block.drop_while(
[&](InstId inst_id) { return !ShouldFormatInst(inst_id); });
}
if (block.empty()) {
return;
}
llvm::SaveAndRestore scope(scope_, scope_id);
// Note, we don't use OpenBrace() / CloseBrace() here because we always want
// a newline to avoid misformatting if the first instruction is omitted.
out_ << "\n" << inst_namer_.GetScopeName(scope_id) << " {\n";
indent_ += 2;
for (const InstId inst_id : block) {
// Format instructions when needed, but do nothing for elided entries;
// unlike normal code blocks, scopes are non-sequential so skipped
// instructions are assumed to be uninteresting.
if (use_tentative_output_scopes) {
// This is for constants and imports. These use tentative logic to
// determine whether an instruction is printed.
TentativeOutputScope scope(*this, tentative_inst_chunks_.Get(inst_id));
FormatInst(inst_id);
} else if (ShouldFormatInst(inst_id)) {
// This is for the file scope. It uses only the range-based filtering.
FormatInst(inst_id);
}
}
out_ << "}\n";
indent_ -= 2;
}
auto Formatter::FormatClass(ClassId id) -> void {
const Class& class_info = sem_ir_->classes().Get(id);
if (!ShouldFormatEntity(class_info)) {
return;
}
FormatEntityStart("class", class_info, id);
llvm::SaveAndRestore class_scope(scope_, inst_namer_.GetScopeFor(id));
if (class_info.scope_id.has_value()) {
out_ << ' ';
OpenBrace();
FormatCodeBlock(class_info.body_block_id);
Indent();
out_ << "complete_type_witness = ";
FormatName(class_info.complete_type_witness_id);
out_ << "\n";
FormatNameScope(class_info.scope_id, "!members:\n");
CloseBrace();
} else {
Semicolon();
}
out_ << '\n';
FormatEntityEnd(class_info.generic_id);
}
auto Formatter::FormatInterface(InterfaceId id) -> void {
const Interface& interface_info = sem_ir_->interfaces().Get(id);
if (!ShouldFormatEntity(interface_info)) {
return;
}
FormatEntityStart("interface", interface_info, id);
llvm::SaveAndRestore interface_scope(scope_, inst_namer_.GetScopeFor(id));
if (interface_info.scope_id.has_value()) {
out_ << ' ';
OpenBrace();
FormatCodeBlock(interface_info.body_block_id);
// Always include the !members label because we always list the witness in
// this section.
IndentLabel();
out_ << "!members:\n";
FormatNameScope(interface_info.scope_id);
Indent();
out_ << "witness = ";
FormatArg(interface_info.associated_entities_id);
out_ << "\n";
CloseBrace();
} else {
Semicolon();
}
out_ << '\n';
FormatEntityEnd(interface_info.generic_id);
}
auto Formatter::FormatAssociatedConstant(AssociatedConstantId id) -> void {
const AssociatedConstant& assoc_const =
sem_ir_->associated_constants().Get(id);
if (!ShouldFormatEntity(assoc_const.decl_id)) {
return;
}
FormatEntityStart("assoc_const", assoc_const.decl_id, assoc_const.generic_id,
id);
llvm::SaveAndRestore assoc_const_scope(scope_, inst_namer_.GetScopeFor(id));
out_ << " ";
FormatName(assoc_const.name_id);
out_ << ":! ";
FormatTypeOfInst(assoc_const.decl_id);
if (assoc_const.default_value_id.has_value()) {
out_ << " = ";
FormatArg(assoc_const.default_value_id);
}
out_ << ";\n";
FormatEntityEnd(assoc_const.generic_id);
}
auto Formatter::FormatImpl(ImplId id) -> void {
const Impl& impl_info = sem_ir_->impls().Get(id);
if (!ShouldFormatEntity(impl_info)) {
return;
}
FormatEntityStart("impl", impl_info, id);
llvm::SaveAndRestore impl_scope(scope_, inst_namer_.GetScopeFor(id));
out_ << ": ";
FormatName(impl_info.self_id);
out_ << " as ";
FormatName(impl_info.constraint_id);
if (impl_info.is_complete()) {
out_ << ' ';
OpenBrace();
FormatCodeBlock(impl_info.body_block_id);
// Print the !members label even if the name scope is empty because we
// always list the witness in this section.
IndentLabel();
out_ << "!members:\n";
if (impl_info.scope_id.has_value()) {
FormatNameScope(impl_info.scope_id);
}
Indent();
out_ << "witness = ";
FormatArg(impl_info.witness_id);
out_ << "\n";
CloseBrace();
} else {
Semicolon();
}
out_ << '\n';
FormatEntityEnd(impl_info.generic_id);
}
auto Formatter::FormatFunction(FunctionId id) -> void {
const Function& fn = sem_ir_->functions().Get(id);
if (!ShouldFormatEntity(fn)) {
return;
}
std::string function_start;
switch (fn.virtual_modifier) {
case FunctionFields::VirtualModifier::Virtual:
function_start += "virtual ";
break;
case FunctionFields::VirtualModifier::Abstract:
function_start += "abstract ";
break;
case FunctionFields::VirtualModifier::Impl:
function_start += "impl ";
break;
case FunctionFields::VirtualModifier::None:
break;
}
if (fn.is_extern) {
function_start += "extern ";
}
function_start += "fn";
FormatEntityStart(function_start, fn, id);
llvm::SaveAndRestore function_scope(scope_, inst_namer_.GetScopeFor(id));
auto return_type_info = ReturnTypeInfo::ForFunction(*sem_ir_, fn);
FormatParamList(fn.call_params_id, return_type_info.is_valid() &&
return_type_info.has_return_slot());
if (fn.builtin_function_kind() != BuiltinFunctionKind::None) {
out_ << " = \""
<< FormatEscaped(fn.builtin_function_kind().name(),
/*use_hex_escapes=*/true)
<< "\"";
}
if (fn.thunk_decl_id().has_value()) {
out_ << " [thunk ";
FormatArg(fn.thunk_decl_id());
out_ << "]";
}
if (!fn.body_block_ids.empty()) {
out_ << ' ';
OpenBrace();
for (auto block_id : fn.body_block_ids) {
IndentLabel();
FormatLabel(block_id);
out_ << ":\n";
FormatCodeBlock(block_id);
}
CloseBrace();
} else {
Semicolon();
}
out_ << '\n';
FormatEntityEnd(fn.generic_id);
}
auto Formatter::FormatSpecificRegion(const Generic& generic,
const Specific& specific,
GenericInstIndex::Region region,
llvm::StringRef region_name) -> void {
if (!specific.GetValueBlock(region).has_value()) {
return;
}
if (!region_name.empty()) {
IndentLabel();
out_ << "!" << region_name << ":\n";
}
for (auto [generic_inst_id, specific_inst_id] : llvm::zip_longest(
sem_ir_->inst_blocks().GetOrEmpty(generic.GetEvalBlock(region)),
sem_ir_->inst_blocks().GetOrEmpty(specific.GetValueBlock(region)))) {
Indent();
if (generic_inst_id) {
FormatName(*generic_inst_id);
} else {
out_ << "<missing>";
}
out_ << " => ";
if (specific_inst_id) {
FormatName(*specific_inst_id);
} else {
out_ << "<missing>";
}
out_ << "\n";
}
}
auto Formatter::FormatSpecific(SpecificId id) -> void {
const auto& specific = sem_ir_->specifics().Get(id);
const auto& generic = sem_ir_->generics().Get(specific.generic_id);
if (!ShouldFormatEntity(generic.decl_id)) {
// Omit specifics if we also omitted the generic.
return;
}
if (specific.IsUnresolved()) {
// Omit specifics that were never resolved. Such specifics exist only to
// track the way the arguments were spelled, and that information is
// conveyed entirely by the name of the specific. These specifics may also
// not be referenced by any SemIR that we format, so including them adds
// clutter and possibly emits references to instructions we didn't name.
return;
}
llvm::SaveAndRestore generic_scope(
scope_, inst_namer_.GetScopeFor(specific.generic_id));
out_ << "\n";
out_ << "specific ";
FormatName(id);
out_ << " ";
OpenBrace();
FormatSpecificRegion(generic, specific, GenericInstIndex::Region::Declaration,
"");
FormatSpecificRegion(generic, specific, GenericInstIndex::Region::Definition,
"definition");
CloseBrace();
out_ << "\n";
}
auto Formatter::FormatGenericStart(llvm::StringRef entity_kind,
GenericId generic_id) -> void {
const auto& generic = sem_ir_->generics().Get(generic_id);
out_ << "\n";
Indent();
out_ << "generic " << entity_kind << " ";
FormatName(generic_id);
llvm::SaveAndRestore generic_scope(scope_,
inst_namer_.GetScopeFor(generic_id));
FormatParamList(generic.bindings_id);
out_ << " ";
OpenBrace();
FormatCodeBlock(generic.decl_block_id);
if (generic.definition_block_id.has_value()) {
IndentLabel();
out_ << "!definition:\n";
FormatCodeBlock(generic.definition_block_id);
}
}
auto Formatter::FormatEntityEnd(GenericId generic_id) -> void {
if (generic_id.has_value()) {
CloseBrace();
out_ << '\n';
}
}
auto Formatter::FormatParamList(InstBlockId params_id, bool has_return_slot)
-> void {
if (!params_id.has_value()) {
// TODO: This happens for imported functions, for which we don't currently
// import the call parameters list.
return;
}
llvm::StringLiteral close = ")";
out_ << "(";
llvm::ListSeparator sep;
for (InstId param_id : sem_ir_->inst_blocks().Get(params_id)) {
auto is_out_param = sem_ir_->insts().Is<OutParam>(param_id);
if (is_out_param) {
// TODO: An input parameter following an output parameter is formatted a
// bit strangely. For example, alternating input and output parameters
// produces:
//
// fn @F(%in1: %t) -> %out1: %t, %in2: %t -> %out2: %t
//
// This doesn't actually happen right now, though.
out_ << std::exchange(close, llvm::StringLiteral(""));
out_ << " -> ";
} else {
out_ << sep;
}
if (!param_id.has_value()) {
out_ << "invalid";
continue;
}
// Don't include the name of the return slot parameter if the function
// doesn't have a return slot; the name won't be used for anything in that
// case.
// TODO: Should the call parameter even exist in that case? There isn't a
// corresponding argument in a `call` instruction.
if (!is_out_param || has_return_slot) {
FormatName(param_id);
out_ << ": ";
}
FormatTypeOfInst(param_id);
}
out_ << close;
}
auto Formatter::FormatCodeBlock(InstBlockId block_id) -> void {
bool elided = false;
for (const InstId inst_id : sem_ir_->inst_blocks().GetOrEmpty(block_id)) {
if (ShouldFormatInst(inst_id)) {
FormatInst(inst_id);
elided = false;
} else if (!elided) {
// When formatting a block, leave a hint that instructions were elided.
Indent();
out_ << "<elided>\n";
elided = true;
}
}
}
auto Formatter::FormatTrailingBlock(InstBlockId block_id) -> void {
out_ << ' ';
OpenBrace();
FormatCodeBlock(block_id);
CloseBrace();
}
auto Formatter::FormatNameScope(NameScopeId id, llvm::StringRef label) -> void {
const auto& scope = sem_ir_->name_scopes().Get(id);
if (scope.entries().empty() && scope.extended_scopes().empty() &&
scope.import_ir_scopes().empty() && !scope.is_cpp_scope() &&
!scope.has_error()) {
// Name scope is empty.
return;
}
if (!label.empty()) {
IndentLabel();
out_ << label;
}
for (auto [name_id, result] : scope.entries()) {
Indent();
out_ << ".";
FormatName(name_id);
switch (result.access_kind()) {
case AccessKind::Public:
break;
case AccessKind::Protected:
out_ << " [protected]";
break;
case AccessKind::Private:
out_ << " [private]";
break;
}
out_ << " = ";
if (result.is_poisoned()) {
out_ << "<poisoned>";
} else {
FormatName(result.is_found() ? result.target_inst_id() : InstId::None);
}
out_ << "\n";
}
for (auto extended_scope_id : scope.extended_scopes()) {
Indent();
out_ << "extend ";
FormatName(extended_scope_id);
out_ << "\n";
}
// This is used to cluster all "Core//prelude/..." imports, but not
// "Core//prelude" itself. This avoids unrelated churn in test files when we
// add or remove an unused prelude file, but is intended to still show the
// existence of indirect imports.
bool has_prelude_components = false;
for (auto [import_ir_id, unused] : scope.import_ir_scopes()) {
auto label = GetImportIRLabel(import_ir_id);
if (label.starts_with("Core//prelude/")) {
if (has_prelude_components) {
// Only print the existence once.
continue;
} else {
has_prelude_components = true;
label = "Core//prelude/...";
}
}
Indent();
out_ << "import " << label << "\n";
}
if (scope.is_cpp_scope()) {
Indent();
out_ << "import Cpp//...\n";
}
if (scope.has_error()) {
Indent();
out_ << "has_error\n";
}
}
auto Formatter::FormatInst(InstId inst_id) -> void {
if (!inst_id.has_value()) {
Indent();
out_ << "none\n";
return;
}
if (!in_terminator_sequence_) {
Indent();
}
auto inst = sem_ir_->insts().GetWithAttachedType(inst_id);
CARBON_KIND_SWITCH(inst) {
case CARBON_KIND(Branch branch): {
out_ << Branch::Kind.ir_name() << " ";
FormatLabel(branch.target_id);
out_ << "\n";
in_terminator_sequence_ = false;
return;
}
case CARBON_KIND(BranchIf branch_if): {
out_ << "if ";
FormatName(branch_if.cond_id);
out_ << " " << Branch::Kind.ir_name() << " ";
FormatLabel(branch_if.target_id);
out_ << " else ";
in_terminator_sequence_ = true;
return;
}
case CARBON_KIND(BranchWithArg branch_with_arg): {
out_ << BranchWithArg::Kind.ir_name() << " ";
FormatLabel(branch_with_arg.target_id);
out_ << "(";
FormatName(branch_with_arg.arg_id);
out_ << ")\n";
in_terminator_sequence_ = false;
return;
}
default: {
FormatInstLhs(inst_id, inst);
out_ << inst.kind().ir_name();
// Add constants for everything except `ImportRefUnloaded`.
if (!inst.Is<ImportRefUnloaded>()) {
pending_constant_value_ =
sem_ir_->constant_values().GetAttached(inst_id);
pending_constant_value_is_self_ =
sem_ir_->constant_values().GetInstIdIfValid(
pending_constant_value_) == inst_id;
}
FormatInstRhs(inst);
// This usually prints the constant, but when `FormatInstRhs` prints it
// first (or for `ImportRefUnloaded`), this does nothing.
FormatPendingConstantValue(AddSpace::Before);
out_ << "\n";
return;
}
}
}
auto Formatter::FormatPendingImportedFrom(AddSpace space_where) -> void {
if (pending_imported_from_.empty()) {
return;
}
if (space_where == AddSpace::Before) {
out_ << ' ';
}
out_ << "[from \"" << FormatEscaped(pending_imported_from_) << "\"]";
if (space_where == AddSpace::After) {
out_ << ' ';
}
pending_imported_from_ = llvm::StringRef();
}
auto Formatter::FormatPendingConstantValue(AddSpace space_where) -> void {
if (pending_constant_value_ == ConstantId::NotConstant) {
return;
}
if (space_where == AddSpace::Before) {
out_ << ' ';
}
out_ << '[';
if (pending_constant_value_.has_value()) {
switch (sem_ir_->constant_values().GetDependence(pending_constant_value_)) {
case ConstantDependence::None:
out_ << "concrete";
break;
case ConstantDependence::PeriodSelf:
out_ << "symbolic_self";
break;
// TODO: Consider renaming this. This will cause a lot of SemIR churn.
case ConstantDependence::Checked:
out_ << "symbolic";
break;
case ConstantDependence::Template:
out_ << "template";
break;
}
if (!pending_constant_value_is_self_) {
out_ << " = ";
FormatConstant(pending_constant_value_);
}
} else {
out_ << pending_constant_value_;
}
out_ << ']';
if (space_where == AddSpace::After) {
out_ << ' ';
}
pending_constant_value_ = ConstantId::NotConstant;
}
auto Formatter::FormatInstLhs(InstId inst_id, Inst inst) -> void {
// Every typed instruction is named, and there are some untyped instructions
// that have names (such as `ImportRefUnloaded`).
bool has_name = inst_namer_.has_name(inst_id);
if (!has_name) {
CARBON_CHECK(!inst.kind().has_type(),
"Missing name for typed instruction: {0}", inst);
return;
}
FormatName(inst_id);
if (inst.kind().has_type()) {
out_ << ": ";
switch (GetExprCategory(*sem_ir_, inst_id)) {
case ExprCategory::NotExpr:
case ExprCategory::Error:
case ExprCategory::Value:
case ExprCategory::Mixed:
break;
case ExprCategory::DurableRef:
case ExprCategory::EphemeralRef:
out_ << "ref ";
break;
case ExprCategory::Initializing:
out_ << "init ";
break;
}
FormatTypeOfInst(inst_id);
}
out_ << " = ";
}
auto Formatter::FormatInstArgAndKind(Inst::ArgAndKind arg_and_kind) -> void {
GetFormatArgFn(arg_and_kind.kind())(*this, arg_and_kind.value());
}
auto Formatter::FormatInstRhs(Inst inst) -> void {
CARBON_KIND_SWITCH(inst) {
case SemIR::InstKind::ArrayInit:
case SemIR::InstKind::StructInit:
case SemIR::InstKind::TupleInit: {
auto init = inst.As<AnyAggregateInit>();
FormatArgs(init.elements_id);
FormatReturnSlotArg(init.dest_id);
return;
}
case SemIR::InstKind::ImportRefLoaded:
case SemIR::InstKind::ImportRefUnloaded:
FormatImportRefRhs(inst.As<AnyImportRef>());
return;
case SemIR::InstKind::OutParam:
case SemIR::InstKind::RefParam:
case SemIR::InstKind::ValueParam: {
auto param = inst.As<AnyParam>();
FormatArgs(param.index);
// Omit pretty_name because it's an implementation detail of
// pretty-printing.
return;
}
case CARBON_KIND(AssociatedConstantDecl decl): {
FormatArgs(decl.assoc_const_id);
llvm::SaveAndRestore scope(scope_,
inst_namer_.GetScopeFor(decl.assoc_const_id));
FormatTrailingBlock(decl.decl_block_id);
return;
}
case CARBON_KIND(BindSymbolicName bind): {
// A BindSymbolicName with no value is a purely symbolic binding, such as
// the `Self` in an interface. Don't print out `none` for the value.
if (bind.value_id.has_value()) {
FormatArgs(bind.entity_name_id, bind.value_id);
} else {
FormatArgs(bind.entity_name_id);
}
return;
}
case CARBON_KIND(BlockArg block): {
out_ << " ";
FormatLabel(block.block_id);
return;
}
case CARBON_KIND(Call call): {
FormatCallRhs(call);
return;
}
case CARBON_KIND(ClassDecl decl): {
FormatDeclRhs(decl.class_id,
sem_ir_->classes().Get(decl.class_id).pattern_block_id,
decl.decl_block_id);
return;
}
case CARBON_KIND(FloatLiteral value): {
llvm::SmallVector<char, 16> buffer;
sem_ir_->floats().Get(value.float_id).toString(buffer);
out_ << " " << buffer;
return;
}
case CARBON_KIND(FunctionDecl decl): {
FormatDeclRhs(decl.function_id,
sem_ir_->functions().Get(decl.function_id).pattern_block_id,
decl.decl_block_id);
return;
}
case InstKind::ImportCppDecl: {
FormatImportCppDeclRhs();
return;
}
case CARBON_KIND(ImplDecl decl): {
FormatDeclRhs(decl.impl_id,
sem_ir_->impls().Get(decl.impl_id).pattern_block_id,
decl.decl_block_id);
return;
}
case CARBON_KIND(InitializeFrom init): {
FormatArgs(init.src_id);
FormatReturnSlotArg(init.dest_id);
return;
}
case CARBON_KIND(InstValue inst): {
out_ << ' ';
OpenBrace();
// TODO: Should we use a more compact representation in the case where the
// inst is a SpliceBlock?
FormatInst(inst.inst_id);
CloseBrace();
return;
}
case CARBON_KIND(InterfaceDecl decl): {
FormatDeclRhs(
decl.interface_id,
sem_ir_->interfaces().Get(decl.interface_id).pattern_block_id,
decl.decl_block_id);
return;
}
case CARBON_KIND(IntValue value): {
out_ << " ";
sem_ir_->ints()
.Get(value.int_id)
.print(out_, sem_ir_->types().IsSignedInt(value.type_id));
return;
}
case CARBON_KIND(NameBindingDecl name): {
FormatTrailingBlock(name.pattern_block_id);
return;
}
case CARBON_KIND(Namespace ns): {
if (ns.import_id.has_value()) {
FormatArgs(ns.import_id, ns.name_scope_id);
} else {
FormatArgs(ns.name_scope_id);
}
return;
}
case CARBON_KIND(ReturnExpr ret): {
FormatArgs(ret.expr_id);
if (ret.dest_id.has_value()) {
FormatReturnSlotArg(ret.dest_id);
}
return;
}
case CARBON_KIND(ReturnSlot ret): {
// Omit inst.type_inst_id because it's not semantically significant.
FormatArgs(ret.storage_id);
return;
}
case InstKind::ReturnSlotPattern:
// No-op because type_id is the only semantically significant field,
// and it's handled separately.
return;
case CARBON_KIND(SpliceBlock splice): {
FormatArgs(splice.result_id);
FormatTrailingBlock(splice.block_id);
return;
}
case CARBON_KIND(StructType struct_type): {
out_ << " {";
llvm::ListSeparator sep;
for (auto field :
sem_ir_->struct_type_fields().Get(struct_type.fields_id)) {
out_ << sep << ".";
FormatName(field.name_id);
out_ << ": ";
FormatInstAsType(field.type_inst_id);
}
out_ << "}";
return;
}
case CARBON_KIND(WhereExpr where): {
FormatArgs(where.period_self_id);
FormatTrailingBlock(where.requirements_id);
return;
}
default:
FormatInstRhsDefault(inst);
return;
}
}
auto Formatter::FormatInstRhsDefault(Inst inst) -> void {
auto arg0 = inst.arg0_and_kind();
if (arg0.kind() == IdKind::None) {
return;
}
out_ << " ";
FormatInstArgAndKind(arg0);
auto arg1 = inst.arg1_and_kind();
if (arg1.kind() == IdKind::None) {
return;
}
// Several instructions have a second operand that's a specific ID. We
// don't include it in the argument list if there is no corresponding
// specific, that is, when we're not in a generic context.
if (auto arg1_specific_id = arg1.TryAs<SpecificId>();
arg1_specific_id && !arg1_specific_id->has_value()) {
return;
}
out_ << ", ";
FormatInstArgAndKind(arg1);
}
auto Formatter::FormatCallRhs(Call inst) -> void {
out_ << " ";
FormatArg(inst.callee_id);
if (!inst.args_id.has_value()) {
out_ << "(<none>)";
return;
}
llvm::ArrayRef<InstId> args = sem_ir_->inst_blocks().Get(inst.args_id);
auto return_info = ReturnTypeInfo::ForType(*sem_ir_, inst.type_id);
if (!return_info.is_valid()) {
out_ << "(<invalid return info>)";
return;
}
bool has_return_slot = return_info.has_return_slot();
InstId return_slot_arg_id = InstId::None;
if (has_return_slot) {
return_slot_arg_id = args.back();
args = args.drop_back();
}
llvm::ListSeparator sep;
out_ << '(';
for (auto inst_id : args) {
out_ << sep;
FormatArg(inst_id);
}
out_ << ')';
if (has_return_slot) {
FormatReturnSlotArg(return_slot_arg_id);
}
}
auto Formatter::FormatImportCppDeclRhs() -> void {
out_ << " ";
OpenBrace();
for (ImportCpp import_cpp : sem_ir_->import_cpps().values()) {
Indent();
out_ << "import Cpp \""
<< FormatEscaped(
sem_ir_->string_literal_values().Get(import_cpp.library_id))
<< "\"\n";
}
CloseBrace();
}
auto Formatter::FormatImportRefRhs(AnyImportRef inst) -> void {
out_ << " ";
auto import_ir_inst = sem_ir_->import_ir_insts().Get(inst.import_ir_inst_id);
FormatArg(import_ir_inst.ir_id());
out_ << ", ";
if (inst.entity_name_id.has_value()) {
// Prefer to show the entity name when possible.
FormatArg(inst.entity_name_id);
} else {
// Show a name based on the location when possible, or the numeric
// instruction as a last resort.
const auto& import_ir = sem_ir_->import_irs().Get(import_ir_inst.ir_id());
auto loc_id =
import_ir.sem_ir->insts().GetCanonicalLocId(import_ir_inst.inst_id());
switch (loc_id.kind()) {
case LocId::Kind::None: {
out_ << import_ir_inst.inst_id() << " [no loc]";
break;
}
case LocId::Kind::ImportIRInstId: {
// TODO: Probably don't want to format each indirection, but maybe
// reuse GetCanonicalImportIRInst?
out_ << import_ir_inst.inst_id() << " [indirect]";
break;
}
case LocId::Kind::NodeId: {
// Formats a NodeId from the import.
const auto& tree = import_ir.sem_ir->parse_tree();
auto token = tree.node_token(loc_id.node_id());
out_ << "loc" << tree.tokens().GetLineNumber(token) << "_"
<< tree.tokens().GetColumnNumber(token);
break;
}
case LocId::Kind::InstId:
CARBON_FATAL("Unexpected LocId: {0}", loc_id);
}
}
out_ << ", "
<< (inst.kind == InstKind::ImportRefLoaded ? "loaded" : "unloaded");
}
auto Formatter::FormatArg(EntityNameId id) -> void {
if (!id.has_value()) {
out_ << "_";
return;
}
const auto& info = sem_ir_->entity_names().Get(id);
FormatName(info.name_id);
if (info.bind_index().has_value()) {
out_ << ", " << info.bind_index().index;
}
if (info.is_template) {
out_ << ", template";
}
}
auto Formatter::FormatArg(FacetTypeId id) -> void {
const auto& info = sem_ir_->facet_types().Get(id);
// Nothing output to indicate that this is a facet type since this is only
// used as the argument to a `facet_type` instruction.
out_ << "<";
llvm::ListSeparator sep(" & ");
if (info.extend_constraints.empty()) {
out_ << "type";
} else {
for (auto interface : info.extend_constraints) {
out_ << sep;
FormatName(interface.interface_id);
if (interface.specific_id.has_value()) {
out_ << ", ";
FormatName(interface.specific_id);
}
}
}
if (info.other_requirements || !info.self_impls_constraints.empty() ||
!info.rewrite_constraints.empty()) {
out_ << " where ";
llvm::ListSeparator and_sep(" and ");
if (!info.self_impls_constraints.empty()) {
out_ << and_sep << ".Self impls ";
llvm::ListSeparator amp_sep(" & ");
for (auto interface : info.self_impls_constraints) {
out_ << amp_sep;
FormatName(interface.interface_id);
if (interface.specific_id.has_value()) {
out_ << ", ";
FormatName(interface.specific_id);
}
}
}
for (auto rewrite : info.rewrite_constraints) {
out_ << and_sep;
FormatArg(rewrite.lhs_id);
out_ << " = ";
FormatArg(rewrite.rhs_id);
}
if (info.other_requirements) {
out_ << and_sep << "TODO";
}
}
out_ << ">";
}
auto Formatter::FormatArg(ImportIRId id) -> void {
if (id.has_value()) {
out_ << GetImportIRLabel(id);
} else {
out_ << id;
}
}
auto Formatter::FormatArg(IntId id) -> void {
// We don't know the signedness to use here. Default to unsigned.
sem_ir_->ints().Get(id).print(out_, /*isSigned=*/false);
}
auto Formatter::FormatArg(NameScopeId id) -> void {
OpenBrace();
FormatNameScope(id);
CloseBrace();
}
auto Formatter::FormatArg(InstBlockId id) -> void {
if (!id.has_value()) {
out_ << "invalid";
return;
}
out_ << '(';
llvm::ListSeparator sep;
for (auto inst_id : sem_ir_->inst_blocks().Get(id)) {
out_ << sep;
FormatArg(inst_id);
}
out_ << ')';
}
auto Formatter::FormatArg(AbsoluteInstBlockId id) -> void {
FormatArg(static_cast<InstBlockId>(id));
}
auto Formatter::FormatArg(RealId id) -> void {
// TODO: Format with a `.` when the exponent is near zero.
const auto& real = sem_ir_->reals().Get(id);
real.mantissa.print(out_, /*isSigned=*/false);
out_ << (real.is_decimal ? 'e' : 'p') << real.exponent;
}
auto Formatter::FormatArg(StringLiteralValueId id) -> void {
out_ << '"'
<< FormatEscaped(sem_ir_->string_literal_values().Get(id),
/*use_hex_escapes=*/true)
<< '"';
}
auto Formatter::FormatReturnSlotArg(InstId dest_id) -> void {
out_ << " to ";
FormatArg(dest_id);
}
auto Formatter::FormatName(NameId id) -> void {
out_ << sem_ir_->names().GetFormatted(id);
}
auto Formatter::FormatName(InstId id) -> void {
if (id.has_value()) {
IncludeChunkInOutput(tentative_inst_chunks_.Get(id));
}
out_ << inst_namer_.GetNameFor(scope_, id);
}
auto Formatter::FormatName(SpecificId id) -> void {
const auto& specific = sem_ir_->specifics().Get(id);
FormatName(specific.generic_id);
FormatArg(specific.args_id);
}
auto Formatter::FormatName(SpecificInterfaceId id) -> void {
const auto& interface = sem_ir_->specific_interfaces().Get(id);
FormatName(interface.interface_id);
if (interface.specific_id.has_value()) {
out_ << ", ";
FormatArg(interface.specific_id);
}
}
auto Formatter::FormatLabel(InstBlockId id) -> void {
out_ << inst_namer_.GetLabelFor(scope_, id);
}
auto Formatter::FormatConstant(ConstantId id) -> void {
if (!id.has_value()) {
out_ << "<not constant>";
return;
}
auto inst_id = GetInstWithConstantValue(*sem_ir_, id);
FormatName(inst_id);
// For an attached constant, also list the unattached constant.
if (id.is_symbolic() && sem_ir_->constant_values()
.GetSymbolicConstant(id)
.generic_id.has_value()) {
// TODO: Skip printing this if it's the same as `inst_id`.
auto unattached_inst_id = sem_ir_->constant_values().GetInstId(id);
out_ << " (";
FormatName(unattached_inst_id);
out_ << ")";
}
}
auto Formatter::FormatInstAsType(InstId id) -> void {
if (!id.has_value()) {
out_ << "invalid";
return;
}
// Types are formatted in the `constants` scope because they typically refer
// to constants.
llvm::SaveAndRestore file_scope(scope_, InstNamer::ScopeId::Constants);
if (auto const_id = sem_ir_->constant_values().GetAttached(id);
const_id.has_value()) {
FormatConstant(const_id);
} else {
// Type instruction didn't have a constant value. Fall back to printing
// the instruction name.
FormatArg(id);
}
}
auto Formatter::FormatTypeOfInst(InstId id) -> void {
auto type_id = sem_ir_->insts().GetAttachedType(id);
if (!type_id.has_value()) {
out_ << "invalid";
return;
}
// Types are formatted in the `constants` scope because they typically refer
// to constants.
llvm::SaveAndRestore file_scope(scope_, InstNamer::ScopeId::Constants);
FormatConstant(sem_ir_->types().GetConstantId(type_id));
}
auto Formatter::GetImportIRLabel(ImportIRId id) -> std::string {
CARBON_CHECK(id.has_value(),
"Callers are responsible for checking `id.has_value`");
const auto& import_ir = *sem_ir_->import_irs().Get(id).sem_ir;
CARBON_CHECK(import_ir.library_id().has_value());
auto package_id = import_ir.package_id();
llvm::StringRef package_name =
package_id.AsIdentifierId().has_value()
? import_ir.identifiers().Get(package_id.AsIdentifierId())
: package_id.AsSpecialName();
llvm::StringRef library_name =
(import_ir.library_id() != LibraryNameId::Default)
? import_ir.string_literal_values().Get(
import_ir.library_id().AsStringLiteralValueId())
: "default";
return llvm::formatv("{0}//{1}", package_name, library_name);
}
} // namespace Carbon::SemIR
// NOLINTEND(misc-no-recursion)
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