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ir: Create usize result_loc for array subscript expr

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Allow the subscript expression to infer the resulting type.

Closes #4169
This commit is contained in:
LemonBoy
2020-03-03 12:13:13 +01:00
committed by Andrew Kelley
parent 06d0dac0fb
commit e2fd289a33
3 changed files with 30 additions and 6 deletions
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14
src/ir.cpp
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@@ -5910,10 +5910,18 @@ static IrInstSrc *ir_gen_array_access(IrBuilderSrc *irb, Scope *scope, AstNode *
if (array_ref_instruction == irb->codegen->invalid_inst_src)
return array_ref_instruction;
// Create an usize-typed result location to hold the subscript value, this
// makes it possible for the compiler to infer the subscript expression type
// if needed
IrInstSrc *usize_type_inst = ir_build_const_type(irb, scope, node, irb->codegen->builtin_types.entry_usize);
ResultLocCast *result_loc_cast = ir_build_cast_result_loc(irb, usize_type_inst, no_result_loc());
AstNode *subscript_node = node->data.array_access_expr.subscript;
IrInstSrc *subscript_instruction = ir_gen_node(irb, subscript_node, scope);
if (subscript_instruction == irb->codegen->invalid_inst_src)
return subscript_instruction;
IrInstSrc *subscript_value = ir_gen_node_extra(irb, subscript_node, scope, LValNone, &result_loc_cast->base);
if (subscript_value == irb->codegen->invalid_inst_src)
return irb->codegen->invalid_inst_src;
IrInstSrc *subscript_instruction = ir_build_implicit_cast(irb, scope, subscript_node, subscript_value, result_loc_cast);
IrInstSrc *ptr_instruction = ir_build_elem_ptr(irb, scope, node, array_ref_instruction,
subscript_instruction, true, PtrLenSingle, nullptr);