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stage2: LLVM backend: implement @tagName for enums

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Introduced a new AIR instruction: `tag_name`. Reasons to do this
instead of lowering it in Sema to a switch, function call, array
lookup, or if-else tower:
 * Sema is a bottleneck; do less work in Sema whenever possible.
 * If any optimization passes run, and the operand to becomes
   comptime-known, then it could change to have a comptime result
   value instead of lowering to a function or array or something which
   would then have to be garbage-collected.
 * Backends may want to choose to use a function and a switch branch,
   or they may want to use a different strategy.

Codegen for `@tagName` is implemented for the LLVM backend but not any
others yet.

Introduced some new `Type` tags:
 * `const_slice_u8_sentinel_0`
 * `manyptr_const_u8_sentinel_0`

The motivation for this was to make typeof() on the tag_name AIR
instruction non-allocating.

A bunch more enum tests are passing now.
This commit is contained in:
Andrew Kelley
2021-12-27 01:14:50 -07:00
parent f41b9cdb6d
commit c8fb36b36c
17 changed files with 1031 additions and 654 deletions
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15
src/codegen/llvm/bindings.zig
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@@ -785,8 +785,23 @@ pub const Builder = opaque {
pub const buildExactSDiv = LLVMBuildExactSDiv;
extern fn LLVMBuildExactSDiv(*const Builder, LHS: *const Value, RHS: *const Value, Name: [*:0]const u8) *const Value;
pub const zigSetCurrentDebugLocation = ZigLLVMSetCurrentDebugLocation;
extern fn ZigLLVMSetCurrentDebugLocation(builder: *const Builder, line: c_int, column: c_int, scope: *DIScope) void;
pub const clearCurrentDebugLocation = ZigLLVMClearCurrentDebugLocation;
extern fn ZigLLVMClearCurrentDebugLocation(builder: *const Builder) void;
pub const getCurrentDebugLocation2 = LLVMGetCurrentDebugLocation2;
extern fn LLVMGetCurrentDebugLocation2(Builder: *const Builder) *Metadata;
pub const setCurrentDebugLocation2 = LLVMSetCurrentDebugLocation2;
extern fn LLVMSetCurrentDebugLocation2(Builder: *const Builder, Loc: *Metadata) void;
};
pub const DIScope = opaque {};
pub const Metadata = opaque {};
pub const IntPredicate = enum(c_uint) {
EQ = 32,
NE = 33,