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astgen: lower s[start..][0..len] to slice_length ZIR

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dweiller 2023-04-30 15:01:21 +10:00
parent e58a0c5e9e
commit 9fb5b047e9
1 changed files with 16 additions and 1 deletions
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17
src/AstGen.zig
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@ -849,10 +849,25 @@ fn expr(gz: *GenZir, scope: *Scope, ri: ResultInfo, node: Ast.Node.Index) InnerE
return rvalue(gz, ri, result, node);
},
.slice => {
const extra = tree.extraData(node_datas[node].rhs, Ast.Node.Slice);
const lhs_node = node_datas[node].lhs;
if (node_tags[lhs_node] == .slice_open and nodeIsTriviallyZero(tree, extra.start)) {
const lhs = try expr(gz, scope, .{ .rl = .ref }, node_datas[lhs_node].lhs);
const start = try expr(gz, scope, .{ .rl = .{ .coerced_ty = .usize_type } }, node_datas[lhs_node].rhs);
const cursor = maybeAdvanceSourceCursorToMainToken(gz, node);
const len = if (extra.end != 0) try expr(gz, scope, .{ .rl = .{ .coerced_ty = .usize_type } }, extra.end) else .none;
try emitDbgStmt(gz, cursor);
const result = try gz.addPlNode(.slice_length, node, Zir.Inst.SliceLength{
.lhs = lhs,
.start = start,
.len = len,
.start_src_node_offset = gz.nodeIndexToRelative(lhs_node),
});
return rvalue(gz, ri, result, node);
}
const lhs = try expr(gz, scope, .{ .rl = .ref }, node_datas[node].lhs);
const cursor = maybeAdvanceSourceCursorToMainToken(gz, node);
const extra = tree.extraData(node_datas[node].rhs, Ast.Node.Slice);
const start = try expr(gz, scope, .{ .rl = .{ .coerced_ty = .usize_type } }, extra.start);
const end = try expr(gz, scope, .{ .rl = .{ .coerced_ty = .usize_type } }, extra.end);
try emitDbgStmt(gz, cursor);