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AstGen: scope result location related functions

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This commit is contained in:
Isaac Freund
2021-03-28 19:53:38 +02:00
parent 402f87a213
commit d123a5ec67
2 changed files with 76 additions and 76 deletions
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33
src/Module.zig
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@@ -920,7 +920,7 @@ pub const Scope = struct {
label: ?Label = null,
break_block: zir.Inst.Index = 0,
continue_block: zir.Inst.Index = 0,
/// Only valid when setBlockResultLoc is called.
/// Only valid when setBreakResultLoc is called.
break_result_loc: AstGen.ResultLoc = undefined,
/// When a block has a pointer result location, here it is.
rl_ptr: zir.Inst.Ref = .none,
@@ -973,6 +973,37 @@ pub const Scope = struct {
return &gz.astgen.decl.container.file_scope.tree;
}
pub fn setBreakResultLoc(gz: *GenZir, parent_rl: AstGen.ResultLoc) void {
// Depending on whether the result location is a pointer or value, different
// ZIR needs to be generated. In the former case we rely on storing to the
// pointer to communicate the result, and use breakvoid; in the latter case
// the block break instructions will have the result values.
// One more complication: when the result location is a pointer, we detect
// the scenario where the result location is not consumed. In this case
// we emit ZIR for the block break instructions to have the result values,
// and then rvalue() on that to pass the value to the result location.
switch (parent_rl) {
.discard, .none, .ty, .ptr, .ref => {
gz.break_result_loc = parent_rl;
},
.inferred_ptr => |ptr| {
gz.rl_ptr = ptr;
gz.break_result_loc = .{ .block_ptr = gz };
},
.bitcasted_ptr => |ptr| {
gz.rl_ptr = ptr;
gz.break_result_loc = .{ .block_ptr = gz };
},
.block_ptr => |parent_block_scope| {
gz.rl_ptr = parent_block_scope.rl_ptr;
gz.break_result_loc = .{ .block_ptr = gz };
},
}
}
pub fn setBoolBrBody(gz: GenZir, inst: zir.Inst.Index) !void {
const gpa = gz.astgen.mod.gpa;
try gz.astgen.extra.ensureCapacity(gpa, gz.astgen.extra.items.len +