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v/vlib/builtin/builtin.v
2020-12-15 09:41:06 +02:00

93 lines
2.5 KiB
V

// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module builtin
__global (
g_m2_buf byteptr
g_m2_ptr byteptr
)
// isnil returns true if an object is nil (only for C objects).
pub fn isnil(v voidptr) bool {
return v == 0
}
/*
fn on_panic(f fn(int)int) {
// TODO
}
*/
// print_backtrace shows a backtrace of the current call stack on stdout
pub fn print_backtrace() {
// at the time of backtrace_symbols_fd call, the C stack would look something like this:
// 1 frame for print_backtrace_skipping_top_frames
// 1 frame for print_backtrace itself
// ... print the rest of the backtrace frames ...
// => top 2 frames should be skipped, since they will not be informative to the developer
print_backtrace_skipping_top_frames(2)
}
__global (
total_m = i64(0)
nr_mallocs = int(0)
)
fn __as_cast(obj voidptr, obj_type int, expected_type int) voidptr {
if obj_type != expected_type {
panic('as cast: cannot cast $obj_type to $expected_type')
}
return obj
}
// VAssertMetaInfo is used during assertions. An instance of it
// is filled in by compile time generated code, when an assertion fails.
pub struct VAssertMetaInfo {
pub:
fpath string // the source file path of the assertion
line_nr int // the line number of the assertion
fn_name string // the function name in which the assertion is
src string // the actual source line of the assertion
op string // the operation of the assertion, i.e. '==', '<', 'call', etc ...
llabel string // the left side of the infix expressions as source
rlabel string // the right side of the infix expressions as source
lvalue string // the stringified *actual value* of the left side of a failed assertion
rvalue string // the stringified *actual value* of the right side of a failed assertion
}
fn __print_assert_failure(i &VAssertMetaInfo) {
eprintln('${i.fpath}:${i.line_nr+1}: FAIL: fn ${i.fn_name}: assert ${i.src}')
if i.op.len > 0 && i.op != 'call' {
eprintln(' left value: ${i.llabel} = ${i.lvalue}')
if i.rlabel == i.rvalue {
eprintln(' right value: $i.rlabel')
}
else {
eprintln(' right value: ${i.rlabel} = ${i.rvalue}')
}
}
}
pub struct MethodArgs {
pub:
typ int
}
pub struct FunctionData {
pub:
name string
attrs []string
args []MethodArgs
return_type int
typ int
}
pub struct FieldData {
pub:
name string
attrs []string
is_pub bool
is_mut bool
typ int
}