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Merge pull request #20725 from ziglang/fuzz

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initial support for integrated fuzzing
This commit is contained in:
Andrew Kelley 2024-07-23 11:39:19 -07:00 committed by GitHub
commit 6f3e9939d0
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GPG Key ID: B5690EEEBB952194
26 changed files with 405 additions and 104 deletions
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62
lib/fuzzer.zig Normal file
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@ -0,0 +1,62 @@
const std = @import("std");
export threadlocal var __sancov_lowest_stack: usize = 0;
export fn __sanitizer_cov_8bit_counters_init(start: [*]u8, stop: [*]u8) void {
std.debug.print("__sanitizer_cov_8bit_counters_init start={*}, stop={*}\n", .{ start, stop });
}
export fn __sanitizer_cov_pcs_init(pcs_beg: [*]const usize, pcs_end: [*]const usize) void {
std.debug.print("__sanitizer_cov_pcs_init pcs_beg={*}, pcs_end={*}\n", .{ pcs_beg, pcs_end });
}
export fn __sanitizer_cov_trace_const_cmp1(arg1: u8, arg2: u8) void {
handleCmp(@returnAddress(), arg1, arg2);
}
export fn __sanitizer_cov_trace_cmp1(arg1: u8, arg2: u8) void {
handleCmp(@returnAddress(), arg1, arg2);
}
export fn __sanitizer_cov_trace_const_cmp2(arg1: u16, arg2: u16) void {
handleCmp(@returnAddress(), arg1, arg2);
}
export fn __sanitizer_cov_trace_cmp2(arg1: u16, arg2: u16) void {
handleCmp(@returnAddress(), arg1, arg2);
}
export fn __sanitizer_cov_trace_const_cmp4(arg1: u32, arg2: u32) void {
handleCmp(@returnAddress(), arg1, arg2);
}
export fn __sanitizer_cov_trace_cmp4(arg1: u32, arg2: u32) void {
handleCmp(@returnAddress(), arg1, arg2);
}
export fn __sanitizer_cov_trace_const_cmp8(arg1: u64, arg2: u64) void {
handleCmp(@returnAddress(), arg1, arg2);
}
export fn __sanitizer_cov_trace_cmp8(arg1: u64, arg2: u64) void {
handleCmp(@returnAddress(), arg1, arg2);
}
export fn __sanitizer_cov_trace_switch(val: u64, cases_ptr: [*]u64) void {
const pc = @returnAddress();
const len = cases_ptr[0];
const val_size_in_bits = cases_ptr[1];
const cases = cases_ptr[2..][0..len];
std.debug.print("0x{x}: switch on value {d} ({d} bits) with {d} cases\n", .{
pc, val, val_size_in_bits, cases.len,
});
}
export fn __sanitizer_cov_trace_pc_indir(callee: usize) void {
const pc = @returnAddress();
std.debug.print("0x{x}: indirect call to 0x{x}\n", .{ pc, callee });
}
fn handleCmp(pc: usize, arg1: u64, arg2: u64) void {
std.debug.print("0x{x}: comparison of {d} and {d}\n", .{ pc, arg1, arg2 });
}

4
lib/std/Build/Module.zig
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@ -28,6 +28,7 @@ stack_protector: ?bool,
stack_check: ?bool,
sanitize_c: ?bool,
sanitize_thread: ?bool,
fuzz: ?bool,
code_model: std.builtin.CodeModel,
valgrind: ?bool,
pic: ?bool,
@ -186,6 +187,7 @@ pub const CreateOptions = struct {
stack_check: ?bool = null,
sanitize_c: ?bool = null,
sanitize_thread: ?bool = null,
fuzz: ?bool = null,
/// Whether to emit machine code that integrates with Valgrind.
valgrind: ?bool = null,
/// Position Independent Code
@ -228,6 +230,7 @@ pub fn init(m: *Module, owner: *std.Build, options: CreateOptions, compile: ?*St
.stack_check = options.stack_check,
.sanitize_c = options.sanitize_c,
.sanitize_thread = options.sanitize_thread,
.fuzz = options.fuzz,
.code_model = options.code_model,
.valgrind = options.valgrind,
.pic = options.pic,
@ -642,6 +645,7 @@ pub fn appendZigProcessFlags(
try addFlag(zig_args, m.error_tracing, "-ferror-tracing", "-fno-error-tracing");
try addFlag(zig_args, m.sanitize_c, "-fsanitize-c", "-fno-sanitize-c");
try addFlag(zig_args, m.sanitize_thread, "-fsanitize-thread", "-fno-sanitize-thread");
try addFlag(zig_args, m.fuzz, "-ffuzz", "-fno-fuzz");
try addFlag(zig_args, m.valgrind, "-fvalgrind", "-fno-valgrind");
try addFlag(zig_args, m.pic, "-fPIC", "-fno-PIC");
try addFlag(zig_args, m.red_zone, "-mred-zone", "-mno-red-zone");

12
lib/std/mem.zig
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@ -636,18 +636,20 @@ test lessThan {
try testing.expect(lessThan(u8, "", "a"));
}
const backend_can_use_eql_bytes = switch (builtin.zig_backend) {
const eqlBytes_allowed = switch (builtin.zig_backend) {
// The SPIR-V backend does not support the optimized path yet.
.stage2_spirv64 => false,
// The RISC-V does not support vectors.
.stage2_riscv64 => false,
else => true,
// The naive memory comparison implementation is more useful for fuzzers to
// find interesting inputs.
else => !builtin.fuzz,
};
/// Compares two slices and returns whether they are equal.
pub fn eql(comptime T: type, a: []const T, b: []const T) bool {
if (@sizeOf(T) == 0) return true;
if (!@inComptime() and std.meta.hasUniqueRepresentation(T) and backend_can_use_eql_bytes) return eqlBytes(sliceAsBytes(a), sliceAsBytes(b));
if (!@inComptime() and std.meta.hasUniqueRepresentation(T) and eqlBytes_allowed) return eqlBytes(sliceAsBytes(a), sliceAsBytes(b));
if (a.len != b.len) return false;
if (a.len == 0 or a.ptr == b.ptr) return true;
@ -660,9 +662,7 @@ pub fn eql(comptime T: type, a: []const T, b: []const T) bool {
/// std.mem.eql heavily optimized for slices of bytes.
fn eqlBytes(a: []const u8, b: []const u8) bool {
if (!backend_can_use_eql_bytes) {
return eql(u8, a, b);
}
comptime assert(eqlBytes_allowed);
if (a.len != b.len) return false;
if (a.len == 0 or a.ptr == b.ptr) return true;

1
lib/std/os/linux/start_pie.zig
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@ -71,6 +71,7 @@ fn getDynamicSymbol() [*]elf.Dyn {
pub fn relocate(phdrs: []elf.Phdr) void {
@setRuntimeSafety(false);
@disableInstrumentation();
const dynv = getDynamicSymbol();
// Recover the delta applied by the loader by comparing the effective and

72
lib/std/os/linux/tls.zig
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@ -110,6 +110,8 @@ const TLSImage = struct {
pub var tls_image: TLSImage = undefined;
pub fn setThreadPointer(addr: usize) void {
@setRuntimeSafety(false);
@disableInstrumentation();
switch (native_arch) {
.x86 => {
var user_desc: linux.user_desc = .{
@ -125,7 +127,7 @@ pub fn setThreadPointer(addr: usize) void {
.useable = 1,
},
};
const rc = linux.syscall1(.set_thread_area, @intFromPtr(&user_desc));
const rc = @call(.always_inline, linux.syscall1, .{ .set_thread_area, @intFromPtr(&user_desc) });
assert(rc == 0);
const gdt_entry_number = user_desc.entry_number;
@ -138,7 +140,7 @@ pub fn setThreadPointer(addr: usize) void {
);
},
.x86_64 => {
const rc = linux.syscall2(.arch_prctl, linux.ARCH.SET_FS, addr);
const rc = @call(.always_inline, linux.syscall2, .{ .arch_prctl, linux.ARCH.SET_FS, addr });
assert(rc == 0);
},
.aarch64, .aarch64_be => {
@ -149,7 +151,7 @@ pub fn setThreadPointer(addr: usize) void {
);
},
.arm, .thumb => {
const rc = linux.syscall1(.set_tls, addr);
const rc = @call(.always_inline, linux.syscall1, .{ .set_tls, addr });
assert(rc == 0);
},
.riscv64 => {
@ -160,7 +162,7 @@ pub fn setThreadPointer(addr: usize) void {
);
},
.mips, .mipsel, .mips64, .mips64el => {
const rc = linux.syscall1(.set_thread_area, addr);
const rc = @call(.always_inline, linux.syscall1, .{ .set_thread_area, addr });
assert(rc == 0);
},
.powerpc, .powerpcle => {
@ -189,6 +191,9 @@ pub fn setThreadPointer(addr: usize) void {
}
fn initTLS(phdrs: []elf.Phdr) void {
@setRuntimeSafety(false);
@disableInstrumentation();
var tls_phdr: ?*elf.Phdr = null;
var img_base: usize = 0;
@ -236,7 +241,7 @@ fn initTLS(phdrs: []elf.Phdr) void {
l += tls_align_factor - delta;
l += @sizeOf(CustomData);
tcb_offset = l;
l += mem.alignForward(usize, tls_tcb_size, tls_align_factor);
l += alignForward(tls_tcb_size, tls_align_factor);
data_offset = l;
l += tls_data_alloc_size;
break :blk l;
@ -244,14 +249,14 @@ fn initTLS(phdrs: []elf.Phdr) void {
.VariantII => blk: {
var l: usize = 0;
data_offset = l;
l += mem.alignForward(usize, tls_data_alloc_size, tls_align_factor);
l += alignForward(tls_data_alloc_size, tls_align_factor);
// The thread pointer is aligned to p_align
tcb_offset = l;
l += tls_tcb_size;
// The CustomData structure is right after the TCB with no padding
// in between so it can be easily found
l += @sizeOf(CustomData);
l = mem.alignForward(usize, l, @alignOf(DTV));
l = alignForward(l, @alignOf(DTV));
dtv_offset = l;
l += @sizeOf(DTV);
break :blk l;
@ -270,13 +275,28 @@ fn initTLS(phdrs: []elf.Phdr) void {
};
}
/// Inline because TLS is not set up yet.
inline fn alignForward(addr: usize, alignment: usize) usize {
return alignBackward(addr + (alignment - 1), alignment);
}
/// Inline because TLS is not set up yet.
inline fn alignBackward(addr: usize, alignment: usize) usize {
return addr & ~(alignment - 1);
}
/// Inline because TLS is not set up yet.
inline fn alignPtrCast(comptime T: type, ptr: [*]u8) *T {
return @ptrCast(@alignCast(ptr));
}
/// Initializes all the fields of the static TLS area and returns the computed
/// architecture-specific value of the thread-pointer register
///
/// This function is inline because thread local storage is not set up yet.
pub fn prepareTLS(area: []u8) usize {
@setRuntimeSafety(false);
@disableInstrumentation();
// Clear the area we're going to use, just to be safe
@memset(area, 0);
// Prepare the DTV
@ -310,6 +330,9 @@ pub fn prepareTLS(area: []u8) usize {
var main_thread_tls_buffer: [0x2100]u8 align(mem.page_size) = undefined;
pub fn initStaticTLS(phdrs: []elf.Phdr) void {
@setRuntimeSafety(false);
@disableInstrumentation();
initTLS(phdrs);
const tls_area = blk: {
@ -321,22 +344,47 @@ pub fn initStaticTLS(phdrs: []elf.Phdr) void {
break :blk main_thread_tls_buffer[0..tls_image.alloc_size];
}
const alloc_tls_area = posix.mmap(
const begin_addr = mmap(
null,
tls_image.alloc_size + tls_image.alloc_align - 1,
posix.PROT.READ | posix.PROT.WRITE,
.{ .TYPE = .PRIVATE, .ANONYMOUS = true },
-1,
0,
) catch posix.abort();
);
if (@as(isize, @bitCast(begin_addr)) < 0) @trap();
const alloc_tls_area: [*]align(mem.page_size) u8 = @ptrFromInt(begin_addr);
// Make sure the slice is correctly aligned.
const begin_addr = @intFromPtr(alloc_tls_area.ptr);
const begin_aligned_addr = mem.alignForward(usize, begin_addr, tls_image.alloc_align);
const begin_aligned_addr = alignForward(begin_addr, tls_image.alloc_align);
const start = begin_aligned_addr - begin_addr;
break :blk alloc_tls_area[start .. start + tls_image.alloc_size];
break :blk alloc_tls_area[start..][0..tls_image.alloc_size];
};
const tp_value = prepareTLS(tls_area);
setThreadPointer(tp_value);
}
inline fn mmap(address: ?[*]u8, length: usize, prot: usize, flags: linux.MAP, fd: i32, offset: i64) usize {
if (@hasField(linux.SYS, "mmap2")) {
return @call(.always_inline, linux.syscall6, .{
.mmap2,
@intFromPtr(address),
length,
prot,
@as(u32, @bitCast(flags)),
@as(usize, @bitCast(@as(isize, fd))),
@as(usize, @truncate(@as(u64, @bitCast(offset)) / linux.MMAP2_UNIT)),
});
} else {
return @call(.always_inline, linux.syscall6, .{
.mmap,
@intFromPtr(address),
length,
prot,
@as(u32, @bitCast(flags)),
@as(usize, @bitCast(@as(isize, fd))),
@as(u64, @bitCast(offset)),
});
}
}

8
lib/std/start.zig
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@ -411,6 +411,10 @@ fn wWinMainCRTStartup() callconv(std.os.windows.WINAPI) noreturn {
}
fn posixCallMainAndExit(argc_argv_ptr: [*]usize) callconv(.C) noreturn {
// We're not ready to panic until thread local storage is initialized.
@setRuntimeSafety(false);
// Code coverage instrumentation might try to use thread local variables.
@disableInstrumentation();
const argc = argc_argv_ptr[0];
const argv = @as([*][*:0]u8, @ptrCast(argc_argv_ptr + 1));
@ -453,9 +457,9 @@ fn posixCallMainAndExit(argc_argv_ptr: [*]usize) callconv(.C) noreturn {
if (comptime native_arch.isARM()) {
if (at_hwcap & std.os.linux.HWCAP.TLS == 0) {
// FIXME: Make __aeabi_read_tp call the kernel helper kuser_get_tls
// For the time being use a simple abort instead of a @panic call to
// For the time being use a simple trap instead of a @panic call to
// keep the binary bloat under control.
std.posix.abort();
@trap();
}
}

14
lib/std/zig/AstGen.zig
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@ -2817,6 +2817,7 @@ fn addEnsureResult(gz: *GenZir, maybe_unused_result: Zir.Inst.Ref, statement: As
.extended => switch (gz.astgen.instructions.items(.data)[@intFromEnum(inst)].extended.opcode) {
.breakpoint,
.disable_instrumentation,
.fence,
.set_float_mode,
.set_align_stack,
@ -9305,12 +9306,13 @@ fn builtinCall(
},
// zig fmt: off
.This => return rvalue(gz, ri, try gz.addNodeExtended(.this, node), node),
.return_address => return rvalue(gz, ri, try gz.addNodeExtended(.ret_addr, node), node),
.error_return_trace => return rvalue(gz, ri, try gz.addNodeExtended(.error_return_trace, node), node),
.frame => return rvalue(gz, ri, try gz.addNodeExtended(.frame, node), node),
.frame_address => return rvalue(gz, ri, try gz.addNodeExtended(.frame_address, node), node),
.breakpoint => return rvalue(gz, ri, try gz.addNodeExtended(.breakpoint, node), node),
.This => return rvalue(gz, ri, try gz.addNodeExtended(.this, node), node),
.return_address => return rvalue(gz, ri, try gz.addNodeExtended(.ret_addr, node), node),
.error_return_trace => return rvalue(gz, ri, try gz.addNodeExtended(.error_return_trace, node), node),
.frame => return rvalue(gz, ri, try gz.addNodeExtended(.frame, node), node),
.frame_address => return rvalue(gz, ri, try gz.addNodeExtended(.frame_address, node), node),
.breakpoint => return rvalue(gz, ri, try gz.addNodeExtended(.breakpoint, node), node),
.disable_instrumentation => return rvalue(gz, ri, try gz.addNodeExtended(.disable_instrumentation, node), node),
.type_info => return simpleUnOpType(gz, scope, ri, node, params[0], .type_info),
.size_of => return simpleUnOpType(gz, scope, ri, node, params[0], .size_of),

1
lib/std/zig/AstRlAnnotate.zig
View File

@ -877,6 +877,7 @@ fn builtinCall(astrl: *AstRlAnnotate, block: ?*Block, ri: ResultInfo, node: Ast.
.error_return_trace,
.frame,
.breakpoint,
.disable_instrumentation,
.in_comptime,
.panic,
.trap,

9
lib/std/zig/BuiltinFn.zig
View File

@ -15,6 +15,7 @@ pub const Tag = enum {
int_from_bool,
bit_size_of,
breakpoint,
disable_instrumentation,
mul_add,
byte_swap,
bit_reverse,
@ -263,6 +264,14 @@ pub const list = list: {
.illegal_outside_function = true,
},
},
.{
"@disableInstrumentation",
.{
.tag = .disable_instrumentation,
.param_count = 0,
.illegal_outside_function = true,
},
},
.{
"@mulAdd",
.{

4
lib/std/zig/Zir.zig
View File

@ -1553,7 +1553,7 @@ pub const Inst = struct {
=> false,
.extended => switch (data.extended.opcode) {
.fence, .set_cold, .breakpoint => true,
.fence, .set_cold, .breakpoint, .disable_instrumentation => true,
else => false,
},
};
@ -1973,6 +1973,8 @@ pub const Inst = struct {
/// Implements `@breakpoint`.
/// `operand` is `src_node: i32`.
breakpoint,
/// Implement builtin `@disableInstrumentation`. `operand` is `src_node: i32`.
disable_instrumentation,
/// Implements the `@select` builtin.
/// `operand` is payload index to `Select`.
select,

3
src/Builtin.zig
View File

@ -10,6 +10,7 @@ optimize_mode: std.builtin.OptimizeMode,
error_tracing: bool,
valgrind: bool,
sanitize_thread: bool,
fuzz: bool,
pic: bool,
pie: bool,
strip: bool,
@ -185,6 +186,7 @@ pub fn append(opts: @This(), buffer: *std.ArrayList(u8)) Allocator.Error!void {
\\pub const have_error_return_tracing = {};
\\pub const valgrind_support = {};
\\pub const sanitize_thread = {};
\\pub const fuzz = {};
\\pub const position_independent_code = {};
\\pub const position_independent_executable = {};
\\pub const strip_debug_info = {};
@ -199,6 +201,7 @@ pub fn append(opts: @This(), buffer: *std.ArrayList(u8)) Allocator.Error!void {
opts.error_tracing,
opts.valgrind,
opts.sanitize_thread,
opts.fuzz,
opts.pic,
opts.pie,
opts.strip,

100
src/Compilation.zig
View File

@ -191,6 +191,7 @@ debug_compile_errors: bool,
incremental: bool,
job_queued_compiler_rt_lib: bool = false,
job_queued_compiler_rt_obj: bool = false,
job_queued_fuzzer_lib: bool = false,
job_queued_update_builtin_zig: bool,
alloc_failure_occurred: bool = false,
formatted_panics: bool = false,
@ -232,6 +233,10 @@ compiler_rt_lib: ?CRTFile = null,
/// Populated when we build the compiler_rt_obj object. A Job to build this is indicated
/// by setting `job_queued_compiler_rt_obj` and resolved before calling linker.flush().
compiler_rt_obj: ?CRTFile = null,
/// Populated when we build the libfuzzer static library. A Job to build this
/// is indicated by setting `job_queued_fuzzer_lib` and resolved before
/// calling linker.flush().
fuzzer_lib: ?CRTFile = null,
glibc_so_files: ?glibc.BuiltSharedObjects = null,
wasi_emulated_libs: []const wasi_libc.CRTFile,
@ -800,6 +805,7 @@ pub const MiscTask = enum {
libcxx,
libcxxabi,
libtsan,
libfuzzer,
wasi_libc_crt_file,
compiler_rt,
zig_libc,
@ -888,6 +894,7 @@ pub const cache_helpers = struct {
hh.add(mod.red_zone);
hh.add(mod.sanitize_c);
hh.add(mod.sanitize_thread);
hh.add(mod.fuzz);
hh.add(mod.unwind_tables);
hh.add(mod.structured_cfg);
hh.addListOfBytes(mod.cc_argv);
@ -1303,6 +1310,7 @@ pub fn create(gpa: Allocator, arena: Allocator, options: CreateOptions) !*Compil
const any_unwind_tables = options.config.any_unwind_tables or options.root_mod.unwind_tables;
const any_non_single_threaded = options.config.any_non_single_threaded or !options.root_mod.single_threaded;
const any_sanitize_thread = options.config.any_sanitize_thread or options.root_mod.sanitize_thread;
const any_fuzz = options.config.any_fuzz or options.root_mod.fuzz;
const link_eh_frame_hdr = options.link_eh_frame_hdr or any_unwind_tables;
const build_id = options.build_id orelse .none;
@ -1564,6 +1572,7 @@ pub fn create(gpa: Allocator, arena: Allocator, options: CreateOptions) !*Compil
comp.config.any_unwind_tables = any_unwind_tables;
comp.config.any_non_single_threaded = any_non_single_threaded;
comp.config.any_sanitize_thread = any_sanitize_thread;
comp.config.any_fuzz = any_fuzz;
const lf_open_opts: link.File.OpenOptions = .{
.linker_script = options.linker_script,
@ -1909,6 +1918,13 @@ pub fn create(gpa: Allocator, arena: Allocator, options: CreateOptions) !*Compil
}
}
if (comp.config.any_fuzz and capable_of_building_compiler_rt) {
if (is_exe_or_dyn_lib) {
log.debug("queuing a job to build libfuzzer", .{});
comp.job_queued_fuzzer_lib = true;
}
}
if (!comp.skip_linker_dependencies and is_exe_or_dyn_lib and
!comp.config.link_libc and capable_of_building_zig_libc)
{
@ -1957,6 +1973,9 @@ pub fn destroy(comp: *Compilation) void {
if (comp.compiler_rt_obj) |*crt_file| {
crt_file.deinit(gpa);
}
if (comp.fuzzer_lib) |*crt_file| {
crt_file.deinit(gpa);
}
if (comp.libc_static_lib) |*crt_file| {
crt_file.deinit(gpa);
}
@ -2722,6 +2741,7 @@ pub fn emitLlvmObject(
.is_small = comp.root_mod.optimize_mode == .ReleaseSmall,
.time_report = comp.time_report,
.sanitize_thread = comp.config.any_sanitize_thread,
.fuzz = comp.config.any_fuzz,
.lto = comp.config.lto,
});
}
@ -3641,15 +3661,9 @@ fn performAllTheWorkInner(
break;
}
if (comp.job_queued_compiler_rt_lib) {
comp.job_queued_compiler_rt_lib = false;
buildCompilerRtOneShot(comp, .Lib, &comp.compiler_rt_lib, main_progress_node);
}
if (comp.job_queued_compiler_rt_obj) {
comp.job_queued_compiler_rt_obj = false;
buildCompilerRtOneShot(comp, .Obj, &comp.compiler_rt_obj, main_progress_node);
}
buildCompilerRtOneShot(comp, &comp.job_queued_compiler_rt_lib, "compiler_rt.zig", .compiler_rt, .Lib, &comp.compiler_rt_lib, main_progress_node);
buildCompilerRtOneShot(comp, &comp.job_queued_compiler_rt_obj, "compiler_rt.zig", .compiler_rt, .Obj, &comp.compiler_rt_obj, main_progress_node);
buildCompilerRtOneShot(comp, &comp.job_queued_fuzzer_lib, "fuzzer.zig", .libfuzzer, .Lib, &comp.fuzzer_lib, main_progress_node);
}
const JobError = Allocator.Error;
@ -4655,23 +4669,27 @@ fn workerUpdateWin32Resource(
fn buildCompilerRtOneShot(
comp: *Compilation,
job_queued: *bool,
root_source_name: []const u8,
misc_task: MiscTask,
output_mode: std.builtin.OutputMode,
out: *?CRTFile,
prog_node: std.Progress.Node,
) void {
if (!job_queued.*) return;
job_queued.* = false;
comp.buildOutputFromZig(
"compiler_rt.zig",
root_source_name,
output_mode,
out,
.compiler_rt,
misc_task,
prog_node,
) catch |err| switch (err) {
error.SubCompilationFailed => return, // error reported already
else => comp.lockAndSetMiscFailure(
.compiler_rt,
"unable to build compiler_rt: {s}",
.{@errorName(err)},
),
else => comp.lockAndSetMiscFailure(misc_task, "unable to build {s}: {s}", .{
@tagName(misc_task), @errorName(err),
}),
};
}
@ -5602,23 +5620,39 @@ pub fn addCCArgs(
try argv.append("-mthumb");
}
if (mod.sanitize_c and !mod.sanitize_thread) {
try argv.append("-fsanitize=undefined");
try argv.append("-fsanitize-trap=undefined");
// It is very common, and well-defined, for a pointer on one side of a C ABI
// to have a different but compatible element type. Examples include:
// `char*` vs `uint8_t*` on a system with 8-bit bytes
// `const char*` vs `char*`
// `char*` vs `unsigned char*`
// Without this flag, Clang would invoke UBSAN when such an extern
// function was called.
try argv.append("-fno-sanitize=function");
} else if (mod.sanitize_c and mod.sanitize_thread) {
try argv.append("-fsanitize=undefined,thread");
try argv.append("-fsanitize-trap=undefined");
try argv.append("-fno-sanitize=function");
} else if (!mod.sanitize_c and mod.sanitize_thread) {
try argv.append("-fsanitize=thread");
{
var san_arg: std.ArrayListUnmanaged(u8) = .{};
const prefix = "-fsanitize=";
if (mod.sanitize_c) {
if (san_arg.items.len == 0) try san_arg.appendSlice(arena, prefix);
try san_arg.appendSlice(arena, "undefined,");
}
if (mod.sanitize_thread) {
if (san_arg.items.len == 0) try san_arg.appendSlice(arena, prefix);
try san_arg.appendSlice(arena, "thread,");
}
if (mod.fuzz) {
if (san_arg.items.len == 0) try san_arg.appendSlice(arena, prefix);
try san_arg.appendSlice(arena, "fuzzer-no-link,");
}
// Chop off the trailing comma and append to argv.
if (san_arg.popOrNull()) |_| {
try argv.append(san_arg.items);
// These args have to be added after the `-fsanitize` arg or
// they won't take effect.
if (mod.sanitize_c) {
try argv.append("-fsanitize-trap=undefined");
// It is very common, and well-defined, for a pointer on one side of a C ABI
// to have a different but compatible element type. Examples include:
// `char*` vs `uint8_t*` on a system with 8-bit bytes
// `const char*` vs `char*`
// `char*` vs `unsigned char*`
// Without this flag, Clang would invoke UBSAN when such an extern
// function was called.
try argv.append("-fno-sanitize=function");
}
}
}
if (mod.red_zone) {

3
src/Compilation/Config.zig
View File

@ -32,6 +32,7 @@ any_non_single_threaded: bool,
/// per-Module setting.
any_error_tracing: bool,
any_sanitize_thread: bool,
any_fuzz: bool,
pie: bool,
/// If this is true then linker code is responsible for making an LLVM IR
/// Module, outputting it to an object file, and then linking that together
@ -82,6 +83,7 @@ pub const Options = struct {
ensure_libcpp_on_non_freestanding: bool = false,
any_non_single_threaded: bool = false,
any_sanitize_thread: bool = false,
any_fuzz: bool = false,
any_unwind_tables: bool = false,
any_dyn_libs: bool = false,
any_c_source_files: bool = false,
@ -486,6 +488,7 @@ pub fn resolve(options: Options) ResolveError!Config {
.any_non_single_threaded = options.any_non_single_threaded,
.any_error_tracing = any_error_tracing,
.any_sanitize_thread = options.any_sanitize_thread,
.any_fuzz = options.any_fuzz,
.root_error_tracing = root_error_tracing,
.pie = pie,
.lto = lto,

20
src/InternPool.zig
View File

@ -5184,11 +5184,11 @@ pub const FuncAnalysis = packed struct(u32) {
is_noinline: bool,
calls_or_awaits_errorable_fn: bool,
stack_alignment: Alignment,
/// True if this function has an inferred error set.
inferred_error_set: bool,
disable_instrumentation: bool,
_: u14 = 0,
_: u13 = 0,
pub const State = enum(u8) {
/// This function has not yet undergone analysis, because we have not
@ -8111,6 +8111,7 @@ pub fn getFuncDecl(
.calls_or_awaits_errorable_fn = false,
.stack_alignment = .none,
.inferred_error_set = false,
.disable_instrumentation = false,
},
.owner_decl = key.owner_decl,
.ty = key.ty,
@ -8214,6 +8215,7 @@ pub fn getFuncDeclIes(
.calls_or_awaits_errorable_fn = false,
.stack_alignment = .none,
.inferred_error_set = true,
.disable_instrumentation = false,
},
.owner_decl = key.owner_decl,
.ty = func_ty,
@ -8405,6 +8407,7 @@ pub fn getFuncInstance(
.calls_or_awaits_errorable_fn = false,
.stack_alignment = .none,
.inferred_error_set = false,
.disable_instrumentation = false,
},
// This is populated after we create the Decl below. It is not read
// by equality or hashing functions.
@ -8504,6 +8507,7 @@ pub fn getFuncInstanceIes(
.calls_or_awaits_errorable_fn = false,
.stack_alignment = .none,
.inferred_error_set = true,
.disable_instrumentation = false,
},
// This is populated after we create the Decl below. It is not read
// by equality or hashing functions.
@ -11225,6 +11229,18 @@ pub fn funcSetCallsOrAwaitsErrorableFn(ip: *InternPool, func: Index) void {
@atomicStore(FuncAnalysis, analysis_ptr, analysis, .release);
}
pub fn funcSetDisableInstrumentation(ip: *InternPool, func: Index) void {
const unwrapped_func = func.unwrap(ip);
const extra_mutex = &ip.getLocal(unwrapped_func.tid).mutate.extra.mutex;
extra_mutex.lock();
defer extra_mutex.unlock();
const analysis_ptr = ip.funcAnalysisPtr(func);
var analysis = analysis_ptr.*;
analysis.disable_instrumentation = true;
@atomicStore(FuncAnalysis, analysis_ptr, analysis, .release);
}
pub fn funcSetCold(ip: *InternPool, func: Index, is_cold: bool) void {
const unwrapped_func = func.unwrap(ip);
const extra_mutex = &ip.getLocal(unwrapped_func.tid).mutate.extra.mutex;

13
src/Package/Module.zig
View File

@ -26,6 +26,7 @@ stack_protector: u32,
red_zone: bool,
sanitize_c: bool,
sanitize_thread: bool,
fuzz: bool,
unwind_tables: bool,
cc_argv: []const []const u8,
/// (SPIR-V) whether to generate a structured control flow graph or not
@ -92,6 +93,7 @@ pub const CreateOptions = struct {
unwind_tables: ?bool = null,
sanitize_c: ?bool = null,
sanitize_thread: ?bool = null,
fuzz: ?bool = null,
structured_cfg: ?bool = null,
};
};
@ -106,6 +108,7 @@ pub const ResolvedTarget = struct {
/// At least one of `parent` and `resolved_target` must be non-null.
pub fn create(arena: Allocator, options: CreateOptions) !*Package.Module {
if (options.inherited.sanitize_thread == true) assert(options.global.any_sanitize_thread);
if (options.inherited.fuzz == true) assert(options.global.any_fuzz);
if (options.inherited.single_threaded == false) assert(options.global.any_non_single_threaded);
if (options.inherited.unwind_tables == true) assert(options.global.any_unwind_tables);
if (options.inherited.error_tracing == true) assert(options.global.any_error_tracing);
@ -210,6 +213,12 @@ pub fn create(arena: Allocator, options: CreateOptions) !*Package.Module {
break :b false;
};
const fuzz = b: {
if (options.inherited.fuzz) |x| break :b x;
if (options.parent) |p| break :b p.fuzz;
break :b false;
};
const code_model = b: {
if (options.inherited.code_model) |x| break :b x;
if (options.parent) |p| break :b p.code_model;
@ -337,6 +346,7 @@ pub fn create(arena: Allocator, options: CreateOptions) !*Package.Module {
.red_zone = red_zone,
.sanitize_c = sanitize_c,
.sanitize_thread = sanitize_thread,
.fuzz = fuzz,
.unwind_tables = unwind_tables,
.cc_argv = options.cc_argv,
.structured_cfg = structured_cfg,
@ -359,6 +369,7 @@ pub fn create(arena: Allocator, options: CreateOptions) !*Package.Module {
.error_tracing = error_tracing,
.valgrind = valgrind,
.sanitize_thread = sanitize_thread,
.fuzz = fuzz,
.pic = pic,
.pie = options.global.pie,
.strip = strip,
@ -427,6 +438,7 @@ pub fn create(arena: Allocator, options: CreateOptions) !*Package.Module {
.red_zone = red_zone,
.sanitize_c = sanitize_c,
.sanitize_thread = sanitize_thread,
.fuzz = fuzz,
.unwind_tables = unwind_tables,
.cc_argv = &.{},
.structured_cfg = structured_cfg,
@ -485,6 +497,7 @@ pub fn createLimited(gpa: Allocator, options: LimitedOptions) Allocator.Error!*P
.red_zone = undefined,
.sanitize_c = undefined,
.sanitize_thread = undefined,
.fuzz = undefined,
.unwind_tables = undefined,
.cc_argv = undefined,
.structured_cfg = undefined,

13
src/Sema.zig
View File

@ -1316,6 +1316,11 @@ fn analyzeBodyInner(
i += 1;
continue;
},
.disable_instrumentation => {
try sema.zirDisableInstrumentation();
i += 1;
continue;
},
.restore_err_ret_index => {
try sema.zirRestoreErrRetIndex(block, extended);
i += 1;
@ -6576,6 +6581,14 @@ fn zirSetCold(sema: *Sema, block: *Block, extended: Zir.Inst.Extended.InstData)
ip.funcSetCold(sema.func_index, is_cold);
}
fn zirDisableInstrumentation(sema: *Sema) CompileError!void {
const pt = sema.pt;
const mod = pt.zcu;
const ip = &mod.intern_pool;
if (sema.func_index == .none) return; // does nothing outside a function
ip.funcSetDisableInstrumentation(sema.func_index);
}
fn zirSetFloatMode(sema: *Sema, block: *Block, extended: Zir.Inst.Extended.InstData) CompileError!void {
const extra = sema.code.extraData(Zir.Inst.UnNode, extended.operand).data;
const src = block.builtinCallArgSrc(extra.node, 0);

25
src/codegen/llvm.zig
View File

@ -1101,6 +1101,7 @@ pub const Object = struct {
is_small: bool,
time_report: bool,
sanitize_thread: bool,
fuzz: bool,
lto: bool,
};
@ -1287,6 +1288,7 @@ pub const Object = struct {
options.is_small,
options.time_report,
options.sanitize_thread,
options.fuzz,
options.lto,
null,
emit_bin_path,
@ -1311,6 +1313,7 @@ pub const Object = struct {
options.is_small,
options.time_report,
options.sanitize_thread,
options.fuzz,
options.lto,
options.asm_path,
emit_bin_path,
@ -1380,6 +1383,25 @@ pub const Object = struct {
_ = try attributes.removeFnAttr(.cold);
}
if (owner_mod.sanitize_thread and !func_analysis.disable_instrumentation) {
try attributes.addFnAttr(.sanitize_thread, &o.builder);
} else {
_ = try attributes.removeFnAttr(.sanitize_thread);
}
if (owner_mod.fuzz and !func_analysis.disable_instrumentation) {
try attributes.addFnAttr(.optforfuzzing, &o.builder);
if (comp.config.any_fuzz) {
_ = try attributes.removeFnAttr(.skipprofile);
_ = try attributes.removeFnAttr(.nosanitize_coverage);
}
} else {
_ = try attributes.removeFnAttr(.optforfuzzing);
if (comp.config.any_fuzz) {
try attributes.addFnAttr(.skipprofile, &o.builder);
try attributes.addFnAttr(.nosanitize_coverage, &o.builder);
}
}
// TODO: disable this if safety is off for the function scope
const ssp_buf_size = owner_mod.stack_protector;
if (ssp_buf_size != 0) {
@ -2979,9 +3001,6 @@ pub const Object = struct {
try attributes.addFnAttr(.minsize, &o.builder);
try attributes.addFnAttr(.optsize, &o.builder);
}
if (owner_mod.sanitize_thread) {
try attributes.addFnAttr(.sanitize_thread, &o.builder);
}
const target = owner_mod.resolved_target.result;
if (target.cpu.model.llvm_name) |s| {
try attributes.addFnAttr(.{ .string = .{

1
src/codegen/llvm/bindings.zig
View File

@ -93,6 +93,7 @@ pub const TargetMachine = opaque {
is_small: bool,
time_report: bool,
tsan: bool,
sancov: bool,
lto: bool,
asm_filename: ?[*:0]const u8,
bin_filename: ?[*:0]const u8,

4
src/link/Coff/lld.zig
View File

@ -460,6 +460,10 @@ pub fn linkWithLLD(self: *Coff, arena: Allocator, tid: Zcu.PerThread.Id, prog_no
try argv.append(comp.libunwind_static_lib.?.full_object_path);
}
if (comp.config.any_fuzz) {
try argv.append(comp.fuzzer_lib.?.full_object_path);
}
if (is_exe_or_dyn_lib and !comp.skip_linker_dependencies) {
if (!comp.config.link_libc) {
if (comp.libc_static_lib) |lib| {

14
src/link/Elf.zig
View File

@ -1144,11 +1144,14 @@ pub fn flushModule(self: *Elf, arena: Allocator, tid: Zcu.PerThread.Id, prog_nod
_ = try rpath_table.put(rpath, {});
}
// TSAN
if (comp.config.any_sanitize_thread) {
try positionals.append(.{ .path = comp.tsan_lib.?.full_object_path });
}
if (comp.config.any_fuzz) {
try positionals.append(.{ .path = comp.fuzzer_lib.?.full_object_path });
}
// libc
if (!comp.skip_linker_dependencies and !comp.config.link_libc) {
if (comp.libc_static_lib) |lib| {
@ -1607,6 +1610,10 @@ fn dumpArgv(self: *Elf, comp: *Compilation) !void {
try argv.append(comp.tsan_lib.?.full_object_path);
}
if (comp.config.any_fuzz) {
try argv.append(comp.fuzzer_lib.?.full_object_path);
}
// libc
if (!comp.skip_linker_dependencies and !comp.config.link_libc) {
if (comp.libc_static_lib) |lib| {
@ -2272,6 +2279,7 @@ fn linkWithLLD(self: *Elf, arena: Allocator, tid: Zcu.PerThread.Id, prog_node: s
man.hash.add(self.bind_global_refs_locally);
man.hash.add(self.compress_debug_sections);
man.hash.add(comp.config.any_sanitize_thread);
man.hash.add(comp.config.any_fuzz);
man.hash.addOptionalBytes(comp.sysroot);
// We don't actually care whether it's a cache hit or miss; we just need the digest and the lock.
@ -2616,6 +2624,10 @@ fn linkWithLLD(self: *Elf, arena: Allocator, tid: Zcu.PerThread.Id, prog_node: s
try argv.append(comp.tsan_lib.?.full_object_path);
}
if (comp.config.any_fuzz) {
try argv.append(comp.fuzzer_lib.?.full_object_path);
}
// libc
if (is_exe_or_dyn_lib and
!comp.skip_linker_dependencies and

9
src/link/MachO.zig
View File

@ -387,11 +387,14 @@ pub fn flushModule(self: *MachO, arena: Allocator, tid: Zcu.PerThread.Id, prog_n
if (module_obj_path) |path| try positionals.append(.{ .path = path });
// TSAN
if (comp.config.any_sanitize_thread) {
try positionals.append(.{ .path = comp.tsan_lib.?.full_object_path });
}
if (comp.config.any_fuzz) {
try positionals.append(.{ .path = comp.fuzzer_lib.?.full_object_path });
}
for (positionals.items) |obj| {
self.classifyInputFile(obj.path, .{ .path = obj.path }, obj.must_link) catch |err| switch (err) {
error.UnknownFileType => try self.reportParseError(obj.path, "unknown file type for an input file", .{}),
@ -725,6 +728,10 @@ fn dumpArgv(self: *MachO, comp: *Compilation) !void {
try argv.appendSlice(&.{ "-rpath", std.fs.path.dirname(path) orelse "." });
}
if (comp.config.any_fuzz) {
try argv.append(comp.fuzzer_lib.?.full_object_path);
}
for (self.lib_dirs) |lib_dir| {
const arg = try std.fmt.allocPrint(arena, "-L{s}", .{lib_dir});
try argv.append(arg);

34
src/main.zig
View File

@ -502,12 +502,14 @@ const usage_build_generic =
\\ -fno-stack-check Disable stack probing in safe builds
\\ -fstack-protector Enable stack protection in unsafe builds
\\ -fno-stack-protector Disable stack protection in safe builds
\\ -fsanitize-c Enable C undefined behavior detection in unsafe builds
\\ -fno-sanitize-c Disable C undefined behavior detection in safe builds
\\ -fvalgrind Include valgrind client requests in release builds
\\ -fno-valgrind Omit valgrind client requests in debug builds
\\ -fsanitize-c Enable C undefined behavior detection in unsafe builds
\\ -fno-sanitize-c Disable C undefined behavior detection in safe builds
\\ -fsanitize-thread Enable Thread Sanitizer
\\ -fno-sanitize-thread Disable Thread Sanitizer
\\ -ffuzz Enable fuzz testing instrumentation
\\ -fno-fuzz Disable fuzz testing instrumentation
\\ -funwind-tables Always produce unwind table entries for all functions
\\ -fno-unwind-tables Never produce unwind table entries
\\ -ferror-tracing Enable error tracing in ReleaseFast mode
@ -1432,6 +1434,10 @@ fn buildOutputType(
mod_opts.sanitize_thread = true;
} else if (mem.eql(u8, arg, "-fno-sanitize-thread")) {
mod_opts.sanitize_thread = false;
} else if (mem.eql(u8, arg, "-ffuzz")) {
mod_opts.fuzz = true;
} else if (mem.eql(u8, arg, "-fno-fuzz")) {
mod_opts.fuzz = false;
} else if (mem.eql(u8, arg, "-fllvm")) {
create_module.opts.use_llvm = true;
} else if (mem.eql(u8, arg, "-fno-llvm")) {
@ -2063,11 +2069,21 @@ fn buildOutputType(
create_module.opts.debug_format = .{ .dwarf = .@"64" };
},
.sanitize => {
if (mem.eql(u8, it.only_arg, "undefined")) {
mod_opts.sanitize_c = true;
} else if (mem.eql(u8, it.only_arg, "thread")) {
mod_opts.sanitize_thread = true;
} else {
var san_it = std.mem.splitScalar(u8, it.only_arg, ',');
var recognized_any = false;
while (san_it.next()) |sub_arg| {
if (mem.eql(u8, sub_arg, "undefined")) {
mod_opts.sanitize_c = true;
recognized_any = true;
} else if (mem.eql(u8, sub_arg, "thread")) {
mod_opts.sanitize_thread = true;
recognized_any = true;
} else if (mem.eql(u8, sub_arg, "fuzzer") or mem.eql(u8, sub_arg, "fuzzer-no-link")) {
mod_opts.fuzz = true;
recognized_any = true;
}
}
if (!recognized_any) {
try cc_argv.appendSlice(arena, it.other_args);
}
},
@ -2645,6 +2661,8 @@ fn buildOutputType(
create_module.opts.any_non_single_threaded = true;
if (mod_opts.sanitize_thread == true)
create_module.opts.any_sanitize_thread = true;
if (mod_opts.fuzz == true)
create_module.opts.any_fuzz = true;
if (mod_opts.unwind_tables == true)
create_module.opts.any_unwind_tables = true;
if (mod_opts.strip == false)
@ -7494,6 +7512,8 @@ fn handleModArg(
create_module.opts.any_non_single_threaded = true;
if (mod_opts.sanitize_thread == true)
create_module.opts.any_sanitize_thread = true;
if (mod_opts.fuzz == true)
create_module.opts.any_fuzz = true;
if (mod_opts.unwind_tables == true)
create_module.opts.any_unwind_tables = true;
if (mod_opts.strip == false)

1
src/print_zir.zig
View File

@ -524,6 +524,7 @@ const Writer = struct {
.frame,
.frame_address,
.breakpoint,
.disable_instrumentation,
.c_va_start,
.in_comptime,
.value_placeholder,

80
src/zig_llvm.cpp
View File

@ -54,6 +54,7 @@
#include <llvm/Transforms/IPO.h>
#include <llvm/Transforms/IPO/AlwaysInliner.h>
#include <llvm/Transforms/Instrumentation/ThreadSanitizer.h>
#include <llvm/Transforms/Instrumentation/SanitizerCoverage.h>
#include <llvm/Transforms/Scalar.h>
#include <llvm/Transforms/Utils.h>
#include <llvm/Transforms/Utils/AddDiscriminators.h>
@ -188,9 +189,31 @@ struct TimeTracerRAII {
};
} // end anonymous namespace
static SanitizerCoverageOptions getSanCovOptions(void) {
SanitizerCoverageOptions o;
o.CoverageType = SanitizerCoverageOptions::SCK_Edge;
o.IndirectCalls = true;
o.TraceBB = false;
o.TraceCmp = true;
o.TraceDiv = false;
o.TraceGep = false;
o.Use8bitCounters = false;
o.TracePC = false;
o.TracePCGuard = false;
o.Inline8bitCounters = true;
o.InlineBoolFlag = false;
o.PCTable = true;
o.NoPrune = false;
o.StackDepth = true;
o.TraceLoads = false;
o.TraceStores = false;
o.CollectControlFlow = false;
return o;
}
bool ZigLLVMTargetMachineEmitToFile(LLVMTargetMachineRef targ_machine_ref, LLVMModuleRef module_ref,
char **error_message, bool is_debug,
bool is_small, bool time_report, bool tsan, bool lto,
bool is_small, bool time_report, bool tsan, bool sancov, bool lto,
const char *asm_filename, const char *bin_filename,
const char *llvm_ir_filename, const char *bitcode_filename)
{
@ -277,39 +300,38 @@ bool ZigLLVMTargetMachineEmitToFile(LLVMTargetMachineRef targ_machine_ref, LLVMM
pass_builder.registerCGSCCAnalyses(cgscc_am);
pass_builder.registerFunctionAnalyses(function_am);
pass_builder.registerLoopAnalyses(loop_am);
pass_builder.crossRegisterProxies(loop_am, function_am,
cgscc_am, module_am);
pass_builder.crossRegisterProxies(loop_am, function_am, cgscc_am, module_am);
// IR verification
if (assertions_on) {
// Verify the input
pass_builder.registerPipelineStartEPCallback(
[](ModulePassManager &module_pm, OptimizationLevel OL) {
module_pm.addPass(VerifierPass());
});
// Verify the output
pass_builder.registerOptimizerLastEPCallback(
[](ModulePassManager &module_pm, OptimizationLevel OL) {
module_pm.addPass(VerifierPass());
});
}
pass_builder.registerPipelineStartEPCallback([&](ModulePassManager &module_pm, OptimizationLevel OL) {
// Verify the input
if (assertions_on) {
module_pm.addPass(VerifierPass());
}
// Passes specific for release build
if (!is_debug) {
pass_builder.registerPipelineStartEPCallback(
[](ModulePassManager &module_pm, OptimizationLevel OL) {
module_pm.addPass(
createModuleToFunctionPassAdaptor(AddDiscriminatorsPass()));
});
}
if (!is_debug) {
module_pm.addPass(createModuleToFunctionPassAdaptor(AddDiscriminatorsPass()));
}
});
// Thread sanitizer
if (tsan) {
pass_builder.registerOptimizerLastEPCallback([](ModulePassManager &module_pm, OptimizationLevel level) {
pass_builder.registerOptimizerEarlyEPCallback([&](ModulePassManager &module_pm, OptimizationLevel OL) {
// Code coverage instrumentation.
if (sancov) {
module_pm.addPass(SanitizerCoveragePass(getSanCovOptions()));
}
// Thread sanitizer
if (tsan) {
module_pm.addPass(ModuleThreadSanitizerPass());
module_pm.addPass(createModuleToFunctionPassAdaptor(ThreadSanitizerPass()));
});
}
}
});
pass_builder.registerOptimizerLastEPCallback([&](ModulePassManager &module_pm, OptimizationLevel level) {
// Verify the output
if (assertions_on) {
module_pm.addPass(VerifierPass());
}
});
ModulePassManager module_pm;
OptimizationLevel opt_level;

2
src/zig_llvm.h
View File

@ -26,7 +26,7 @@
ZIG_EXTERN_C bool ZigLLVMTargetMachineEmitToFile(LLVMTargetMachineRef targ_machine_ref, LLVMModuleRef module_ref,
char **error_message, bool is_debug,
bool is_small, bool time_report, bool tsan, bool lto,
bool is_small, bool time_report, bool tsan, bool sancov, bool lto,
const char *asm_filename, const char *bin_filename,
const char *llvm_ir_filename, const char *bitcode_filename);

BIN
stage1/zig1.wasm
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