v/vlib/builtin/builtin_windows.c.v

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// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module builtin
// dbghelp.h is already included in cheaders.v
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#flag windows -l dbghelp
pub struct SymbolInfo {
pub mut:
f_size_of_struct u32 // must be 88 to be recognised by SymFromAddr
f_type_index u32 // Type Index of symbol
f_reserved [2]u64
f_index u32
f_size u32
f_mod_base u64 // Base Address of module comtaining this symbol
f_flags u32
f_value u64 // Value of symbol, ValuePresent should be 1
f_address u64 // Address of symbol including base address of module
f_register u32 // register holding value or pointer to value
f_scope u32 // scope of the symbol
f_tag u32 // pdb classification
f_name_len u32 // Actual length of name
f_max_name_len u32 // must be manually set
f_name byte // must be calloc(f_max_name_len)
}
pub struct SymbolInfoContainer {
pub mut:
syminfo SymbolInfo
f_name_rest [254]char
}
pub struct Line64 {
pub mut:
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f_size_of_struct u32
f_key voidptr
f_line_number u32
f_file_name byteptr
f_address u64
}
fn C.SymSetOptions(symoptions u32) u32 // returns the current options mask
fn C.GetCurrentProcess() voidptr // returns handle
fn C.SymInitialize(h_process voidptr, p_user_search_path byteptr, b_invade_process int) int
fn C.CaptureStackBackTrace(frames_to_skip u32, frames_to_capture u32, p_backtrace voidptr, p_backtrace_hash voidptr) u16
fn C.SymFromAddr(h_process voidptr, address u64, p_displacement voidptr, p_symbol voidptr) int
fn C.SymGetLineFromAddr64(h_process voidptr, address u64, p_displacement voidptr, p_line &Line64) int
// Ref - https://docs.microsoft.com/en-us/windows/win32/api/dbghelp/nf-dbghelp-symsetoptions
const (
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symopt_undname = 0x00000002
symopt_deferred_loads = 0x00000004
symopt_no_cpp = 0x00000008
symopt_load_lines = 0x00000010
symopt_include_32bit_modules = 0x00002000
symopt_allow_zero_address = 0x01000000
symopt_debug = 0x80000000
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)
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fn builtin_init() {
if is_atty(1) > 0 {
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C.SetConsoleMode(C.GetStdHandle(C.STD_OUTPUT_HANDLE), C.ENABLE_PROCESSED_OUTPUT | 0x0004) // enable_virtual_terminal_processing
C.setbuf(C.stdout, 0)
}
add_unhandled_exception_handler()
}
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fn print_backtrace_skipping_top_frames(skipframes int) bool {
$if msvc {
return print_backtrace_skipping_top_frames_msvc(skipframes)
}
$if mingw {
return print_backtrace_skipping_top_frames_mingw(skipframes)
}
eprintln('print_backtrace_skipping_top_frames is not implemented')
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return false
}
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fn print_backtrace_skipping_top_frames_msvc(skipframes int) bool {
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$if msvc {
mut offset := u64(0)
backtraces := [100]voidptr
sic := SymbolInfoContainer{}
mut si := &sic.syminfo
si.f_size_of_struct = sizeof(SymbolInfo) // Note: C.SYMBOL_INFO is 88
si.f_max_name_len = sizeof(SymbolInfoContainer) - sizeof(SymbolInfo) - 1
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fname := charptr( &si.f_name )
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mut sline64 := Line64{}
sline64.f_size_of_struct = sizeof(Line64)
handle := C.GetCurrentProcess()
defer { C.SymCleanup(handle) }
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C.SymSetOptions(symopt_debug | symopt_load_lines | symopt_undname)
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syminitok := C.SymInitialize( handle, 0, 1)
if syminitok != 1 {
eprintln('Failed getting process: Aborting backtrace.\n')
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return true
}
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frames := int(C.CaptureStackBackTrace(skipframes + 1, 100, backtraces, 0))
for i in 0..frames {
frame_addr := backtraces[i]
if C.SymFromAddr(handle, frame_addr, &offset, si) == 1 {
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nframe := frames - i - 1
mut lineinfo := ''
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if C.SymGetLineFromAddr64(handle, frame_addr, &offset, &sline64) == 1 {
file_name := tos3(sline64.f_file_name)
lineinfo = '${file_name}:${sline64.f_line_number}'
} else {
addr :
lineinfo = '?? : address = 0x${(&frame_addr):x}'
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}
sfunc := tos3(fname)
eprintln('${nframe:-2d}: ${sfunc:-25s} $lineinfo')
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} else {
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// https://docs.microsoft.com/en-us/windows/win32/debug/system-error-codes
cerr := int(C.GetLastError())
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if cerr == 87 {
eprintln('SymFromAddr failure: $cerr = The parameter is incorrect)')
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} else if cerr == 487 {
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// probably caused because the .pdb isn't in the executable folder
eprintln('SymFromAddr failure: $cerr = Attempt to access invalid address (Verify that you have the .pdb file in the right folder.)')
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} else {
eprintln('SymFromAddr failure: $cerr (see https://docs.microsoft.com/en-us/windows/win32/debug/system-error-codes)')
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}
}
}
return true
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} $else {
eprintln('print_backtrace_skipping_top_frames_msvc must be called only when the compiler is msvc')
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return false
}
}
fn print_backtrace_skipping_top_frames_mingw(skipframes int) bool {
eprintln('print_backtrace_skipping_top_frames_mingw is not implemented')
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return false
}
//TODO copypaste from os
// we want to be able to use this here without having to `import os`
struct ExceptionRecord {
pub:
// status_ constants
code u32
flags u32
record &ExceptionRecord
address voidptr
param_count u32
// params []voidptr
}
struct ContextRecord {
// TODO
}
struct ExceptionPointers {
pub:
exception_record &ExceptionRecord
context_record &ContextRecord
}
type VectoredExceptionHandler fn(&ExceptionPointers)u32
fn C.AddVectoredExceptionHandler(u32, VectoredExceptionHandler)
fn add_vectored_exception_handler(handler VectoredExceptionHandler) {
C.AddVectoredExceptionHandler(1, handler)
}
[windows_stdcall]
fn unhandled_exception_handler(e &ExceptionPointers) u32 {
match e.exception_record.code {
// These are 'used' by the backtrace printer
// so we dont want to catch them...
0x4001000A, 0x40010006 {
return 0
}
else {
println('Unhandled Exception 0x${e.exception_record.code:X}')
print_backtrace_skipping_top_frames(5)
}
}
return 0
}
pub fn add_unhandled_exception_handler() {
add_vectored_exception_handler(unhandled_exception_handler)
}