diff options
Diffstat (limited to 'src/llvm_backend_stmt.cpp')
| -rw-r--r-- | src/llvm_backend_stmt.cpp | 66 |
1 files changed, 48 insertions, 18 deletions
diff --git a/src/llvm_backend_stmt.cpp b/src/llvm_backend_stmt.cpp index da7fdaead..7f677b238 100644 --- a/src/llvm_backend_stmt.cpp +++ b/src/llvm_backend_stmt.cpp @@ -480,7 +480,8 @@ gb_internal void lb_build_range_map(lbProcedure *p, lbValue expr, Type *val_type gb_internal void lb_build_range_string(lbProcedure *p, lbValue expr, Type *val_type, - lbValue *val_, lbValue *idx_, lbBlock **loop_, lbBlock **done_) { + lbValue *val_, lbValue *idx_, lbBlock **loop_, lbBlock **done_, + bool is_reverse) { lbModule *m = p->module; lbValue count = lb_const_int(m, t_int, 0); Type *expr_type = base_type(expr.type); @@ -499,35 +500,64 @@ gb_internal void lb_build_range_string(lbProcedure *p, lbValue expr, Type *val_t lbBlock *done = nullptr; lbBlock *body = nullptr; + loop = lb_create_block(p, "for.string.loop"); + body = lb_create_block(p, "for.string.body"); + done = lb_create_block(p, "for.string.done"); lbAddr offset_ = lb_add_local_generated(p, t_int, false); - lb_addr_store(p, offset_, lb_const_int(m, t_int, 0)); + lbValue offset = {}; + lbValue cond = {}; - loop = lb_create_block(p, "for.string.loop"); - lb_emit_jump(p, loop); - lb_start_block(p, loop); + if (!is_reverse) { + lb_addr_store(p, offset_, lb_const_int(m, t_int, 0)); + lb_emit_jump(p, loop); + lb_start_block(p, loop); - body = lb_create_block(p, "for.string.body"); - done = lb_create_block(p, "for.string.done"); + offset = lb_addr_load(p, offset_); + cond = lb_emit_comp(p, Token_Lt, offset, count); + } else { + // NOTE(bill): REVERSED LOGIC + lb_addr_store(p, offset_, count); - lbValue offset = lb_addr_load(p, offset_); - lbValue cond = lb_emit_comp(p, Token_Lt, offset, count); + lb_emit_jump(p, loop); + lb_start_block(p, loop); + + offset = lb_addr_load(p, offset_); + cond = lb_emit_comp(p, Token_Gt, offset, lb_const_int(m, t_int, 0)); + } lb_emit_if(p, cond, body, done); lb_start_block(p, body); - lbValue str_elem = lb_emit_ptr_offset(p, lb_string_elem(p, expr), offset); - lbValue str_len = lb_emit_arith(p, Token_Sub, count, offset, t_int); - auto args = array_make<lbValue>(permanent_allocator(), 1); - args[0] = lb_emit_string(p, str_elem, str_len); - lbValue rune_and_len = lb_emit_runtime_call(p, "string_decode_rune", args); - lbValue len = lb_emit_struct_ev(p, rune_and_len, 1); - lb_addr_store(p, offset_, lb_emit_arith(p, Token_Add, offset, len, t_int)); + lbValue rune_and_len = {}; + if (!is_reverse) { + lbValue str_elem = lb_emit_ptr_offset(p, lb_string_elem(p, expr), offset); + lbValue str_len = lb_emit_arith(p, Token_Sub, count, offset, t_int); + auto args = array_make<lbValue>(permanent_allocator(), 1); + args[0] = lb_emit_string(p, str_elem, str_len); + + rune_and_len = lb_emit_runtime_call(p, "string_decode_rune", args); + lbValue len = lb_emit_struct_ev(p, rune_and_len, 1); + lb_addr_store(p, offset_, lb_emit_arith(p, Token_Add, offset, len, t_int)); + + idx = offset; + } else { + // NOTE(bill): REVERSED LOGIC + lbValue str_elem = lb_string_elem(p, expr); + lbValue str_len = offset; + auto args = array_make<lbValue>(permanent_allocator(), 1); + args[0] = lb_emit_string(p, str_elem, str_len); + + rune_and_len = lb_emit_runtime_call(p, "string_decode_last_rune", args); + lbValue len = lb_emit_struct_ev(p, rune_and_len, 1); + lb_addr_store(p, offset_, lb_emit_arith(p, Token_Sub, offset, len, t_int)); + + idx = lb_addr_load(p, offset_); + } - idx = offset; if (val_type != nullptr) { val = lb_emit_struct_ev(p, rune_and_len, 0); } @@ -919,7 +949,7 @@ gb_internal void lb_build_range_stmt(lbProcedure *p, AstRangeStmt *rs, Scope *sc } Type *t = base_type(string.type); GB_ASSERT(!is_type_cstring(t)); - lb_build_range_string(p, string, val0_type, &val, &key, &loop, &done); + lb_build_range_string(p, string, val0_type, &val, &key, &loop, &done, rs->reverse); break; } case Type_Tuple: |