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AstGen: slightly better eager-allocating heuristic

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Some early ensureCapacity calls to avoid needless reallocations.
This commit is contained in:
Andrew Kelley 2021-04-20 22:16:45 -07:00
parent a1ac2b95bb
commit d10ec6e70d
1 changed files with 7 additions and 1 deletions
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8
src/AstGen.zig
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@ -81,8 +81,14 @@ pub fn generate(gpa: *Allocator, file: *Scope.File) InnerError!Zir {
};
defer astgen.deinit(gpa);
// We expect at least as many ZIR instructions and extra data items
// as AST nodes.
try astgen.instructions.ensureTotalCapacity(gpa, file.tree.nodes.len);
// First few indexes of extra are reserved and set at the end.
try astgen.extra.resize(gpa, @typeInfo(Zir.ExtraIndex).Enum.fields.len);
const reserved_count = @typeInfo(Zir.ExtraIndex).Enum.fields.len;
try astgen.extra.ensureTotalCapacity(gpa, file.tree.nodes.len + reserved_count);
astgen.extra.items.len += reserved_count;
var gen_scope: GenZir = .{
.force_comptime = true,