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ability to cast slice to u8 slice

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This commit is contained in:
Andrew Kelley
2016-05-07 18:45:28 -07:00
parent 9e0165147e
commit 9d29674711
6 changed files with 84 additions and 8 deletions
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37
src/codegen.cpp
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@@ -860,6 +860,43 @@ static LLVMValueRef gen_cast_expr(CodeGen *g, AstNode *node) {
actual_type->data.array.len, false);
LLVMBuildStore(g->builder, len_val, len_ptr);
return cast_expr->tmp_ptr;
}
case CastOpResizeSlice:
{
assert(cast_expr->tmp_ptr);
assert(wanted_type->id == TypeTableEntryIdStruct);
assert(wanted_type->data.structure.is_slice);
assert(actual_type->id == TypeTableEntryIdStruct);
assert(actual_type->data.structure.is_slice);
TypeTableEntry *actual_pointer_type = actual_type->data.structure.fields[0].type_entry;
TypeTableEntry *actual_child_type = actual_pointer_type->data.pointer.child_type;
set_debug_source_node(g, node);
int actual_ptr_index = actual_type->data.structure.fields[0].gen_index;
int actual_len_index = actual_type->data.structure.fields[1].gen_index;
int wanted_ptr_index = wanted_type->data.structure.fields[0].gen_index;
int wanted_len_index = wanted_type->data.structure.fields[1].gen_index;
LLVMValueRef src_len_ptr = LLVMBuildStructGEP(g->builder, expr_val, actual_len_index, "");
LLVMValueRef src_len = LLVMBuildLoad(g->builder, src_len_ptr, "");
LLVMValueRef src_size = LLVMConstInt(g->builtin_types.entry_isize->type_ref,
type_size(g, actual_child_type), false);
LLVMValueRef new_len = LLVMBuildMul(g->builder, src_len, src_size, "");
LLVMValueRef dest_len_ptr = LLVMBuildStructGEP(g->builder, cast_expr->tmp_ptr,
wanted_len_index, "");
LLVMBuildStore(g->builder, new_len, dest_len_ptr);
LLVMValueRef src_ptr_ptr = LLVMBuildStructGEP(g->builder, expr_val, actual_ptr_index, "");
LLVMValueRef src_ptr = LLVMBuildLoad(g->builder, src_ptr_ptr, "");
LLVMValueRef src_ptr_casted = LLVMBuildBitCast(g->builder, src_ptr,
wanted_type->data.structure.fields[0].type_entry->type_ref, "");
LLVMValueRef dest_ptr_ptr = LLVMBuildStructGEP(g->builder, cast_expr->tmp_ptr,
wanted_ptr_index, "");
LLVMBuildStore(g->builder, src_ptr_casted, dest_ptr_ptr);
return cast_expr->tmp_ptr;
}
case CastOpIntToFloat: