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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
1c748c0f14
Continuing along with #3070. Note this is just a file rename, with BUILD edits; every file previously in semantics/ should show as moved (except maybe BUILDs, which split).
73 lines
3.0 KiB
Modula-2
73 lines
3.0 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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// Supported x-macros are:
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// - CARBON_SEMANTICS_BUILTIN_KIND_NAME(Name)
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// Used as a fallback if other macros are missing. Used directly by Invalid
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// only, which is defined last.
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// - CARBON_SEMANTICS_BUILTIN_KIND(Name, Label)
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// Defines a non-Invalid builtin type. The label is used for stringifying
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// types.
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//
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// This tree represents the subset relationship between these macros, where if a
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// specific x-macro isn't defined, it'll fall back to the parent macro.
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#if !(defined(CARBON_SEMANTICS_BUILTIN_KIND_NAME) || \
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defined(CARBON_SEMANTICS_BUILTIN_KIND))
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#error \
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"Must define CARBON_SEMANTICS_BUILTIN_KIND family x-macros to use this file."
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#endif
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// If CARBON_SEMANTICS_BUILTIN_KIND_NAME is undefined, ignore calls.
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#ifndef CARBON_SEMANTICS_BUILTIN_KIND_NAME
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#define CARBON_SEMANTICS_BUILTIN_KIND_NAME(Name)
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#endif
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// If CARBON_SEMANTICS_BUILTIN_KIND is undefined, delegate calls to
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// CARBON_SEMANTICS_BUILTIN_KIND_NAME.
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#ifndef CARBON_SEMANTICS_BUILTIN_KIND
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#define CARBON_SEMANTICS_BUILTIN_KIND(Name, ...) \
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CARBON_SEMANTICS_BUILTIN_KIND_NAME(Name)
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#endif
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// Tracks expressions which are valid as types.
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// This has a deliberately self-referential type.
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CARBON_SEMANTICS_BUILTIN_KIND(TypeType, "type")
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// Used when a semantic error has been detected, and a SemanticNodeId is still
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// required. For example, when there is a type checking issue, this will be used
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// in the type_id. It's typically used as a cue that semantic checking doesn't
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// need to issue further diagnostics.
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CARBON_SEMANTICS_BUILTIN_KIND(Error, "<error>")
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// -----------------------------------------------------------------------------
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// TODO: Below types are all placeholders. While the above may last, the below
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// are expected to need to change in order to better reflect Carbon's design.
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// Keeping distinct placeholders can help find usages for later fixes.
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// -----------------------------------------------------------------------------
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// The type of bool literals and branch conditions, bool.
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CARBON_SEMANTICS_BUILTIN_KIND(BoolType, "bool")
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// The type of integer values and integer literals, currently always i32.
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CARBON_SEMANTICS_BUILTIN_KIND(IntegerType, "i32")
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// The type of floating point values and real literals, currently always f64.
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CARBON_SEMANTICS_BUILTIN_KIND(FloatingPointType, "f64")
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// The type of string values and String literals.
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CARBON_SEMANTICS_BUILTIN_KIND(StringType, "String")
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// Keep invalid last, so that we can use values as array indices without needing
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// an invalid entry.
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CARBON_SEMANTICS_BUILTIN_KIND_NAME(Invalid)
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#undef CARBON_SEMANTICS_BUILTIN_KIND_NAME
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#undef CARBON_SEMANTICS_BUILTIN_KIND
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