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std.zig.AstGen: use shrinkRetainingCapacity while shrinking scratch list

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After #25832 it has safety features (memset to undefined), we can take
use of that here, since scratch is a temporary storage.
This commit is contained in:
Mateusz Poliwczak 2025-11-08 20:57:59 +01:00
parent be4eaed7c4
commit 3e3f8a44d6
1 changed files with 5 additions and 5 deletions
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10
lib/std/zig/AstGen.zig
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@ -5004,7 +5004,7 @@ fn structDeclInner(
defer block_scope.unstack();
const scratch_top = astgen.scratch.items.len;
defer astgen.scratch.items.len = scratch_top;
defer astgen.scratch.shrinkRetainingCapacity(scratch_top);
var backing_int_body_len: usize = 0;
const backing_int_ref: Zir.Inst.Ref = blk: {
@ -5225,7 +5225,7 @@ fn tupleDecl(
// init: Inst.Ref, // `.none` for non-`comptime` fields
// }
const fields_start = astgen.scratch.items.len;
defer astgen.scratch.items.len = fields_start;
defer astgen.scratch.shrinkRetainingCapacity(fields_start);
try astgen.scratch.ensureUnusedCapacity(gpa, container_decl.ast.members.len * 2);
@ -7269,7 +7269,7 @@ fn switchExprErrUnion(
const case_table_end = multi_case_table + multi_cases_len;
try astgen.scratch.resize(gpa, case_table_end);
defer astgen.scratch.items.len = scratch_top;
defer astgen.scratch.shrinkRetainingCapacity(scratch_top);
var block_scope = parent_gz.makeSubBlock(scope);
// block_scope not used for collecting instructions
@ -7804,7 +7804,7 @@ fn switchExpr(
const multi_case_table = scalar_case_table + scalar_cases_len;
const case_table_end = multi_case_table + multi_cases_len;
try astgen.scratch.resize(gpa, case_table_end);
defer astgen.scratch.items.len = scratch_top;
defer astgen.scratch.shrinkRetainingCapacity(scratch_top);
var block_scope = parent_gz.makeSubBlock(scope);
// block_scope not used for collecting instructions
@ -10134,7 +10134,7 @@ fn callExpr(
try gz.instructions.append(astgen.gpa, call_index);
const scratch_top = astgen.scratch.items.len;
defer astgen.scratch.items.len = scratch_top;
defer astgen.scratch.shrinkRetainingCapacity(scratch_top);
var scratch_index = scratch_top;
try astgen.scratch.resize(astgen.gpa, scratch_top + call.ast.params.len);