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Richard SmithandChandler Carruth
1013d1773c
Start treating function calls as initializing expressions instead of as value expressions. This required adding support for expression categories. Value bindings and temporary materialization conversions are created where necessary to transition between expression categories. For a function call with a return slot, we speculatively create a materialized temporary before the call and either commit to it or replace it with something else later, once we see how the function call expression is actually used. This change follows the direction suggested in #3133 for initializing expressions: depending on the return type of a function, the return value will either be initialized in-place or returned directly. This is visible in the semantics IR, which is a little unfortunate but is probably necessary as this is part of the semantics of the program. --------- Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
101 lines
5.8 KiB
Modula-2
101 lines
5.8 KiB
Modula-2
// 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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//
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// This is an X-macro header. It does not use `#include` guards, and instead is
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// designed to be `#include`ed after the x-macro is defined in order for its
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// inclusion to expand to the desired output. Macro definitions are cleaned up
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// at the end of this file.
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//
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// Exactly one of these macros should be defined before including this header:
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// - CARBON_SEMANTICS_NODE_KIND(Name)
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// Invoked for each kind of semantic node.
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// - CARBON_SEMANTICS_NODE_KIND_WITH_VALUE_KIND(Name, TypeFieldKind)
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// Invoked for each kind of semantic node, along with information about
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// whether the node produces a value, and if so, what kind of value.
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// - CARBON_SEMANTICS_NODE_KIND_WITH_TERMINATOR_KIND(Name, TerminatorKind)
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// Invoked for each kind of semantic node, along with information about
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// whether the node is a terminator node.
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// - CARBON_SEMANTICS_NODE_KIND_WITH_IR_NAME(Name, IRName)
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// Invoked for each kind of semantic node, along with the name that is used
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// to denote this node in textual Semantics IR.
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#if defined(CARBON_SEMANTICS_NODE_KIND)
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#define CARBON_SEMANTICS_NODE_KIND_IMPL(Name, IRName, ValueKind, \
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TerminatorKind) \
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CARBON_SEMANTICS_NODE_KIND(Name)
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#elif defined(CARBON_SEMANTICS_NODE_KIND_WITH_VALUE_KIND)
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#define CARBON_SEMANTICS_NODE_KIND_IMPL(Name, IRName, ValueKind, \
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TerminatorKind) \
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CARBON_SEMANTICS_NODE_KIND_WITH_VALUE_KIND(Name, ValueKind)
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#elif defined(CARBON_SEMANTICS_NODE_KIND_WITH_TERMINATOR_KIND)
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#define CARBON_SEMANTICS_NODE_KIND_IMPL(Name, IRName, ValueKind, \
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TerminatorKind) \
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CARBON_SEMANTICS_NODE_KIND_WITH_TERMINATOR_KIND(Name, TerminatorKind)
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#elif defined(CARBON_SEMANTICS_NODE_KIND_WITH_IR_NAME)
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#define CARBON_SEMANTICS_NODE_KIND_IMPL(Name, IRName, ValueKind, \
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TerminatorKind) \
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CARBON_SEMANTICS_NODE_KIND_WITH_IR_NAME(Name, IRName)
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#else
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#error "Must define the x-macro to use this file."
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#endif
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CARBON_SEMANTICS_NODE_KIND_IMPL(Invalid, "invalid", None, NotTerminator)
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// A cross-reference between IRs.
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CARBON_SEMANTICS_NODE_KIND_IMPL(CrossReference, "xref", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(AddressOf, "address_of", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(ArrayIndex, "array_index", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(ArrayType, "array_type", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(ArrayValue, "array_value", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(Assign, "assign", None, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(BinaryOperatorAdd, "add", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(BindValue, "bind_value", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(BlockArg, "block_arg", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(BoolLiteral, "bool_literal", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(Branch, "br", None, Terminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(BranchIf, "br", None, TerminatorSequence)
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CARBON_SEMANTICS_NODE_KIND_IMPL(BranchWithArg, "br", None, Terminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(Builtin, "builtin", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(Call, "call", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(ConstType, "const_type", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(Dereference, "dereference", Typed,
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NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(FunctionDeclaration, "fn_decl", Untyped,
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NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(IntegerLiteral, "int_literal", Typed,
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NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(MaterializeTemporary, "materialize_temporary",
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Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(Namespace, "namespace", Untyped, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(NoOp, "no_op", None, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(Parameter, "parameter", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(PointerType, "ptr_type", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(RealLiteral, "real_literal", Typed,
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NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(Return, "return", None, Terminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(ReturnExpression, "return", None, Terminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(StringLiteral, "string_literal", Typed,
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NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(StructAccess, "struct_access", Typed,
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NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(StructType, "struct_type", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(StructTypeField, "struct_type_field", None,
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NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(StructValue, "struct_value", Typed,
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NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(StubReference, "stub_reference", Typed,
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NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(TupleIndex, "tuple_index", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(TupleType, "tuple_type", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(TupleValue, "tuple_value", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(UnaryOperatorNot, "not", Typed, NotTerminator)
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CARBON_SEMANTICS_NODE_KIND_IMPL(VarStorage, "var", Typed, NotTerminator)
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#undef CARBON_SEMANTICS_NODE_KIND
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#undef CARBON_SEMANTICS_NODE_KIND_WITH_VALUE_KIND
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#undef CARBON_SEMANTICS_NODE_KIND_WITH_TERMINATOR_KIND
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#undef CARBON_SEMANTICS_NODE_KIND_WITH_IR_NAME
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#undef CARBON_SEMANTICS_NODE_KIND_IMPL
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