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fix enum sizes too large

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closes #598
This commit is contained in:
Andrew Kelley
2017-11-08 21:44:10 -05:00
parent 53b18c8542
commit 4f8c26d2c6
3 changed files with 65 additions and 4 deletions
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13
src/codegen.cpp
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@@ -2666,9 +2666,16 @@ static LLVMValueRef ir_render_enum_tag_name(CodeGen *g, IrExecutable *executable
if (ir_want_debug_safety(g, &instruction->base)) {
TypeTableEntry *enum_type = enum_tag_type->data.enum_tag.enum_type;
size_t field_count = enum_type->data.enumeration.src_field_count;
LLVMValueRef zero = LLVMConstNull(LLVMTypeOf(enum_tag_value));
LLVMValueRef end_val = LLVMConstInt(LLVMTypeOf(enum_tag_value), field_count, false);
add_bounds_check(g, enum_tag_value, LLVMIntUGE, zero, LLVMIntULT, end_val);
// if the field_count can't fit in the bits of the enum_tag_type, then it can't possibly
// be the wrong value
BigInt field_bi;
bigint_init_unsigned(&field_bi, field_count);
TypeTableEntry *tag_int_type = enum_tag_type->data.enum_tag.int_type;
if (bigint_fits_in_bits(&field_bi, tag_int_type->data.integral.bit_count, false)) {
LLVMValueRef end_val = LLVMConstInt(LLVMTypeOf(enum_tag_value), field_count, false);
add_bounds_check(g, enum_tag_value, LLVMIntEQ, nullptr, LLVMIntULT, end_val);
}
}
LLVMValueRef indices[] = {