Andrew Kelley fa5011aa31 C backend: avoid memcpy when len=0 ...

As of Clang 18, calling memcpy() with a misaligned pointer trips UBSAN,
even if the length is zero. This unfortunately includes any call to
`@memcpy` when source or destination are undefined and the length is
zero.

This patch makes the C backend avoid calling memcpy when the length is
zero, thereby avoiding undefined behavior.

A zig1.wasm update will be needed in the llvm18 branch to activate this
code.

2024-05-01 12:05:12 -07:00

..

arch

x86_64: fix C abi for unions

2024-04-23 17:16:03 -07:00

codegen

C backend: avoid memcpy when len=0

2024-05-01 12:05:12 -07:00

Compilation

std.builtin: make link mode fields lowercase

2024-03-11 07:09:10 -07:00

link

NetBSD: avoid ldd error on executables. zig cc produce 4 PT_LOAD segments,

2024-05-01 12:05:05 -07:00

Liveness

Air: replace .dbg_inline_* with .dbg_inline_block

2024-03-02 21:19:34 -08:00

Package

fetch: combine unpack error validation in a single function

2024-04-11 15:44:40 -07:00

Sema

compiler: un-implement #19634

2024-04-17 13:41:25 +01:00

Air.zig

compiler: implement analysis-local comptime-mutable memory

2024-03-25 14:49:41 +00:00

Builtin.zig

Target: cleanup

2024-04-14 15:33:46 -04:00

clang_options_data.zig

mingw: support -municode

2024-03-27 10:05:57 +00:00

clang_options.zig

zig cc: honor all -m and -mno- CPU feature flags

2021-11-26 19:59:33 -07:00

clang.zig

translate-c: translate 80/128-bit long double literals

2023-11-21 14:14:01 +02:00

codegen.zig

compiler: rework comptime pointer representation and access

2024-04-17 13:41:25 +01:00

Compilation.zig

Autodoc: fix root module name in sources.tar

2024-04-12 23:43:57 -07:00

crash_report.zig

cbe: rewrite CType

2024-03-30 20:50:48 -04:00

DarwinPosixSpawn.zig

fix compilation failures found by CI

2024-03-19 16:18:18 -07:00

glibc.zig

std.Build.Cache: use an array hash map for files

2024-03-21 19:56:30 -07:00

InternPool.zig

x86_64: fix C abi for unions

2024-04-23 17:16:03 -07:00

introspect.zig

move zig libc command to be lazily built

2024-02-27 22:55:00 -07:00

libcxx.zig

std.builtin: make link mode fields lowercase

2024-03-11 07:09:10 -07:00

libtsan.zig

std.builtin: make link mode fields lowercase

2024-03-11 07:09:10 -07:00

libunwind.zig

std.builtin: make link mode fields lowercase

2024-03-11 07:09:10 -07:00

link.zig

Update uses of @fieldParentPtr to use RLS

2024-03-30 20:50:48 -04:00

Liveness.zig

InternPool: create specialized functions for loading namespace types

2024-03-06 21:26:37 +00:00

main.zig

std.Build: revert --host-target, --host-cpu, --host-dynamic-linker

2024-04-18 03:02:13 -07:00

mingw.zig

mingw: support -municode

2024-03-27 10:05:57 +00:00

Module.zig

x86_64: fix C abi for unions

2024-04-23 17:16:03 -07:00

musl.zig

std.builtin: make link mode fields lowercase

2024-03-11 07:09:10 -07:00

mutable_value.zig

compiler: rework comptime pointer representation and access

2024-04-17 13:41:25 +01:00

Package.zig

fetch: filter unpack errors

2024-04-09 15:00:21 +02:00

print_air.zig

compiler: rework comptime pointer representation and access

2024-04-17 13:41:25 +01:00

print_env.zig

move zig libc command to be lazily built

2024-02-27 22:55:00 -07:00

print_targets.zig

move zig libc command to be lazily built

2024-02-27 22:55:00 -07:00

print_value.zig

Sema: cap depth of value printing in type names

2024-04-17 22:47:54 -07:00

print_zir.zig

Update usages of fmtId/isValidId

2024-04-07 14:47:11 +02:00

RangeSet.zig

compiler: rename value.zig to Value.zig

2024-02-05 18:13:07 -07:00

register_manager.zig

Update uses of @fieldParentPtr to use RLS

2024-03-30 20:50:48 -04:00

Sema.zig

Sema+llvm: properly implement Interrupt callconv

2024-05-01 12:04:44 -07:00

target.zig

haiku: default to single threaded to work around tls bugs

2024-04-08 13:20:14 -04:00

tracy.zig

tracy: protect source info via global constant

2023-10-23 18:36:00 -07:00

translate_c.zig

translate-c: allow str literals in bool expressions

2024-04-12 10:10:42 +00:00

type.zig

compiler: rework comptime pointer representation and access

2024-04-17 13:41:25 +01:00

Value.zig

Sema: cap depth of value printing in type names

2024-04-17 22:47:54 -07:00

wasi_libc.zig

move zig libc command to be lazily built

2024-02-27 22:55:00 -07:00

zig_clang_cc1_main.cpp

update ar and clang C++ files to LLVM 17

2023-09-19 09:37:30 -07:00

zig_clang_cc1as_main.cpp

update ar and clang C++ files to LLVM 17

2023-09-19 09:37:30 -07:00

zig_clang_driver.cpp

clang patch: update main function

2023-09-19 09:37:30 -07:00

zig_clang.cpp

translate-c: translate 80/128-bit long double literals

2023-11-21 14:14:01 +02:00

zig_clang.h

translate-c: translate 80/128-bit long double literals

2023-11-21 14:14:01 +02:00

zig_llvm-ar.cpp

llvm-ar patch: update main function

2023-09-19 09:37:30 -07:00

zig_llvm.cpp

Add comment explaining LLVM bug and linking tracking issue

2024-03-03 02:28:24 +01:00

zig_llvm.h

LLVM: Add enableBrokenDebugInfoCheck and getBrokenDebugInfo

2024-03-02 20:53:06 +01:00