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https://github.com/carbon-language/carbon-lang.git
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Geoff RomerandJon Ross-Perkins
dc32aa2690
Introduces the `BindingPattern` and `SymbolicBindingPattern` insts, and a separate stack of pattern blocks that they are emitted into. The intent is to generate the corresponding pattern-matching insts (like `BindName`) from them in a separate pass, but that is deferred to future PRs. See [here](https://docs.google.com/document/d/1U_vQH17V893J9aF1LJXUnFYBNSs2MjKl4bJPaWCB2zo/edit?usp=sharing&resourcekey=0-w0xGYZ0An31Kpz-wvzSXwQ) for the design this is based on, but note that during review we have chosen to deviate from that design by putting the patterns in separate blocks, and omitting the "forward references" from a `BindingPattern` to its corresponding `BindName`. This in turn necessitates having separate inst kinds for symbolic and non-symbolic binding patterns. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
77 lines
2.8 KiB
C++
77 lines
2.8 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "toolchain/check/name_component.h"
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#include "toolchain/check/context.h"
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namespace Carbon::Check {
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auto PopNameComponent(Context& context) -> NameComponent {
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Parse::NodeId first_param_node_id = Parse::InvalidNodeId();
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Parse::NodeId last_param_node_id = Parse::InvalidNodeId();
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// Explicit params.
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auto [params_loc_id, params_id] =
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context.node_stack().PopWithNodeIdIf<Parse::NodeKind::TuplePattern>();
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if (params_id) {
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first_param_node_id =
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context.node_stack()
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.PopForSoloNodeId<Parse::NodeKind::TuplePatternStart>();
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last_param_node_id = params_loc_id;
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}
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// Implicit params.
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auto [implicit_params_loc_id, implicit_params_id] =
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context.node_stack()
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.PopWithNodeIdIf<Parse::NodeKind::ImplicitParamList>();
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if (implicit_params_id) {
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// Implicit params always come before explicit params.
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first_param_node_id =
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context.node_stack()
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.PopForSoloNodeId<Parse::NodeKind::ImplicitParamListStart>();
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// Only use the end of implicit params if there weren't explicit params.
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if (last_param_node_id.is_valid()) {
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last_param_node_id = params_loc_id;
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}
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}
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auto [name_loc_id, name_id] = context.node_stack().PopNameWithNodeId();
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return {
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.name_loc_id = name_loc_id,
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.name_id = name_id,
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.first_param_node_id = first_param_node_id,
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.last_param_node_id = last_param_node_id,
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.implicit_params_loc_id = implicit_params_loc_id,
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.implicit_params_id =
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implicit_params_id.value_or(SemIR::InstBlockId::Invalid),
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.params_loc_id = params_loc_id,
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.params_id = params_id.value_or(SemIR::InstBlockId::Invalid),
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.pattern_block_id = context.pattern_block_stack().Pop(),
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};
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}
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// Pop the name of a declaration from the node stack, and diagnose if it has
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// parameters.
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auto PopNameComponentWithoutParams(Context& context, Lex::TokenKind introducer)
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-> NameComponent {
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NameComponent name = PopNameComponent(context);
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if (name.implicit_params_id.is_valid() || name.params_id.is_valid()) {
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CARBON_DIAGNOSTIC(UnexpectedDeclNameParams, Error,
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"`{0}` declaration cannot have parameters",
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Lex::TokenKind);
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// Point to the lexically first parameter list in the diagnostic.
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context.emitter().Emit(name.implicit_params_id.is_valid()
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? name.implicit_params_loc_id
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: name.params_loc_id,
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UnexpectedDeclNameParams, introducer);
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name.implicit_params_id = SemIR::InstBlockId::Invalid;
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name.params_id = SemIR::InstBlockId::Invalid;
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}
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return name;
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}
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} // namespace Carbon::Check
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