Compilation: enable the x86_64 backend by default for debug builds

.github/workflows/ci.yaml

@@ -20,6 +20,14 @@ jobs:
         uses: actions/checkout@v4
       - name: Build and Test
         run: sh ci/x86_64-linux-debug.sh
+  x86_64-linux-debug-llvm:
+    timeout-minutes: 540
+    runs-on: [self-hosted, Linux, x86_64]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Build and Test
+        run: sh ci/x86_64-linux-debug-llvm.sh
   x86_64-linux-release:
     timeout-minutes: 540
     runs-on: [self-hosted, Linux, x86_64]

CMakeLists.txt

@@ -519,6 +519,7 @@ set(ZIG_STAGE2_SOURCES
     src/Air/Legalize.zig
     src/Air/Liveness.zig
     src/Air/Liveness/Verify.zig
+    src/Air/print.zig
     src/Air/types_resolved.zig
     src/Builtin.zig
     src/Compilation.zig
@@ -675,7 +676,6 @@ set(ZIG_STAGE2_SOURCES
     src/libs/mingw.zig
     src/libs/musl.zig
     src/mutable_value.zig
-    src/print_air.zig
     src/print_env.zig
     src/print_targets.zig
     src/print_value.zig

build.zig

@@ -92,6 +92,12 @@ pub fn build(b: *std.Build) !void {
     const skip_single_threaded = b.option(bool, "skip-single-threaded", "Main test suite skips tests that are single-threaded") orelse false;
     const skip_translate_c = b.option(bool, "skip-translate-c", "Main test suite skips translate-c tests") orelse false;
     const skip_run_translated_c = b.option(bool, "skip-run-translated-c", "Main test suite skips run-translated-c tests") orelse false;
+    const skip_freebsd = b.option(bool, "skip-freebsd", "Main test suite skips targets with freebsd OS") orelse false;
+    const skip_netbsd = b.option(bool, "skip-netbsd", "Main test suite skips targets with netbsd OS") orelse false;
+    const skip_windows = b.option(bool, "skip-windows", "Main test suite skips targets with windows OS") orelse false;
+    const skip_macos = b.option(bool, "skip-macos", "Main test suite skips targets with macos OS") orelse false;
+    const skip_linux = b.option(bool, "skip-linux", "Main test suite skips targets with linux OS") orelse false;
+    const skip_llvm = b.option(bool, "skip-llvm", "Main test suite skips targets that use LLVM backend") orelse false;
 
     const only_install_lib_files = b.option(bool, "lib-files-only", "Only install library files") orelse false;
 
@@ -435,10 +441,15 @@ pub fn build(b: *std.Build) !void {
         .include_paths = &.{},
         .skip_single_threaded = skip_single_threaded,
         .skip_non_native = skip_non_native,
+        .skip_freebsd = skip_freebsd,
+        .skip_netbsd = skip_netbsd,
+        .skip_windows = skip_windows,
+        .skip_macos = skip_macos,
+        .skip_linux = skip_linux,
+        .skip_llvm = skip_llvm,
         .skip_libc = skip_libc,
-        .use_llvm = use_llvm,
-        // 2520100864 was observed on an x86_64-linux-gnu host.
-        .max_rss = 2772110950,
+        // 2923515904 was observed on an x86_64-linux-gnu host.
+        .max_rss = 3100000000,
     }));
 
     test_modules_step.dependOn(tests.addModuleTests(b, .{
@@ -452,8 +463,13 @@ pub fn build(b: *std.Build) !void {
         .include_paths = &.{"test/c_import"},
         .skip_single_threaded = true,
         .skip_non_native = skip_non_native,
+        .skip_freebsd = skip_freebsd,
+        .skip_netbsd = skip_netbsd,
+        .skip_windows = skip_windows,
+        .skip_macos = skip_macos,
+        .skip_linux = skip_linux,
+        .skip_llvm = skip_llvm,
         .skip_libc = skip_libc,
-        .use_llvm = use_llvm,
     }));
 
     test_modules_step.dependOn(tests.addModuleTests(b, .{
@@ -467,8 +483,13 @@ pub fn build(b: *std.Build) !void {
         .include_paths = &.{},
         .skip_single_threaded = true,
         .skip_non_native = skip_non_native,
+        .skip_freebsd = skip_freebsd,
+        .skip_netbsd = skip_netbsd,
+        .skip_windows = skip_windows,
+        .skip_macos = skip_macos,
+        .skip_linux = skip_linux,
+        .skip_llvm = skip_llvm,
         .skip_libc = true,
-        .use_llvm = use_llvm,
         .no_builtin = true,
     }));
 
@@ -483,8 +504,13 @@ pub fn build(b: *std.Build) !void {
         .include_paths = &.{},
         .skip_single_threaded = true,
         .skip_non_native = skip_non_native,
+        .skip_freebsd = skip_freebsd,
+        .skip_netbsd = skip_netbsd,
+        .skip_windows = skip_windows,
+        .skip_macos = skip_macos,
+        .skip_linux = skip_linux,
+        .skip_llvm = skip_llvm,
         .skip_libc = true,
-        .use_llvm = use_llvm,
         .no_builtin = true,
     }));
 
@@ -499,8 +525,13 @@ pub fn build(b: *std.Build) !void {
         .include_paths = &.{},
         .skip_single_threaded = skip_single_threaded,
         .skip_non_native = skip_non_native,
+        .skip_freebsd = skip_freebsd,
+        .skip_netbsd = skip_netbsd,
+        .skip_windows = skip_windows,
+        .skip_macos = skip_macos,
+        .skip_linux = skip_linux,
+        .skip_llvm = skip_llvm,
         .skip_libc = skip_libc,
-        .use_llvm = use_llvm,
         // I observed a value of 5605064704 on the M2 CI.
         .max_rss = 6165571174,
     }));
@@ -536,6 +567,12 @@ pub fn build(b: *std.Build) !void {
     test_step.dependOn(tests.addCAbiTests(b, .{
         .test_target_filters = test_target_filters,
         .skip_non_native = skip_non_native,
+        .skip_freebsd = skip_freebsd,
+        .skip_netbsd = skip_netbsd,
+        .skip_windows = skip_windows,
+        .skip_macos = skip_macos,
+        .skip_linux = skip_linux,
+        .skip_llvm = skip_llvm,
         .skip_release = skip_release,
     }));
     test_step.dependOn(tests.addLinkTests(b, enable_macos_sdk, enable_ios_sdk, enable_symlinks_windows));
@@ -549,7 +586,6 @@ pub fn build(b: *std.Build) !void {
         .lldb = b.option([]const u8, "lldb", "path to lldb binary"),
         .optimize_modes = optimization_modes,
         .skip_single_threaded = skip_single_threaded,
-        .skip_non_native = skip_non_native,
         .skip_libc = skip_libc,
     })) |test_debugger_step| test_step.dependOn(test_debugger_step);
     if (tests.addLlvmIrTests(b, .{

ci/x86_64-linux-debug-llvm.sh

@@ -0,0 +1,70 @@
+#!/bin/sh
+
+# Requires cmake ninja-build
+
+set -x
+set -e
+
+ARCH="$(uname -m)"
+TARGET="$ARCH-linux-musl"
+MCPU="baseline"
+CACHE_BASENAME="zig+llvm+lld+clang-$TARGET-0.15.0-dev.233+7c85dc460"
+PREFIX="$HOME/deps/$CACHE_BASENAME"
+ZIG="$PREFIX/bin/zig"
+
+export PATH="$HOME/deps/wasmtime-v29.0.0-$ARCH-linux:$HOME/deps/qemu-linux-x86_64-9.2.0-rc1/bin:$HOME/local/bin:$PATH"
+
+# Make the `zig version` number consistent.
+# This will affect the cmake command below.
+git fetch --unshallow || true
+git fetch --tags
+
+# Override the cache directories because they won't actually help other CI runs
+# which will be testing alternate versions of zig, and ultimately would just
+# fill up space on the hard drive for no reason.
+export ZIG_GLOBAL_CACHE_DIR="$PWD/zig-global-cache"
+export ZIG_LOCAL_CACHE_DIR="$PWD/zig-local-cache"
+
+mkdir build-debug-llvm
+cd build-debug-llvm
+
+export CC="$ZIG cc -target $TARGET -mcpu=$MCPU"
+export CXX="$ZIG c++ -target $TARGET -mcpu=$MCPU"
+
+cmake .. \
+  -DCMAKE_INSTALL_PREFIX="stage3-debug" \
+  -DCMAKE_PREFIX_PATH="$PREFIX" \
+  -DCMAKE_BUILD_TYPE=Debug \
+  -DZIG_TARGET_TRIPLE="$TARGET" \
+  -DZIG_TARGET_MCPU="$MCPU" \
+  -DZIG_STATIC=ON \
+  -DZIG_NO_LIB=ON \
+  -DZIG_EXTRA_BUILD_ARGS="-Duse-llvm=true" \
+  -GNinja
+
+# Now cmake will use zig as the C/C++ compiler. We reset the environment variables
+# so that installation and testing do not get affected by them.
+unset CC
+unset CXX
+
+ninja install
+
+# simultaneously test building self-hosted without LLVM and with 32-bit arm
+stage3-debug/bin/zig build \
+  -Dtarget=arm-linux-musleabihf \
+  -Dno-lib
+
+stage3-debug/bin/zig build test docs \
+  --maxrss 21000000000 \
+  -Dlldb=$HOME/deps/lldb-zig/Debug-e0a42bb34/bin/lldb \
+  -fqemu \
+  -fwasmtime \
+  -Dstatic-llvm \
+  -Dskip-freebsd \
+  -Dskip-netbsd \
+  -Dskip-windows \
+  -Dskip-macos \
+  -Dtarget=native-native-musl \
+  --search-prefix "$PREFIX" \
+  --zig-lib-dir "$PWD/../lib" \
+  -Denable-superhtml

ci/x86_64-linux-debug.sh

@@ -25,12 +25,6 @@ git fetch --tags
 export ZIG_GLOBAL_CACHE_DIR="$PWD/zig-global-cache"
 export ZIG_LOCAL_CACHE_DIR="$PWD/zig-local-cache"
 
-# Test building from source without LLVM.
-cc -o bootstrap bootstrap.c
-./bootstrap
-./zig2 build -Dno-lib
-./zig-out/bin/zig test test/behavior.zig
-
 mkdir build-debug
 cd build-debug
 
@@ -65,39 +59,12 @@ stage3-debug/bin/zig build test docs \
   -fqemu \
   -fwasmtime \
   -Dstatic-llvm \
+  -Dskip-freebsd \
+  -Dskip-netbsd \
+  -Dskip-windows \
+  -Dskip-macos \
+  -Dskip-llvm \
   -Dtarget=native-native-musl \
   --search-prefix "$PREFIX" \
   --zig-lib-dir "$PWD/../lib" \
   -Denable-superhtml
-
-# Ensure that updating the wasm binary from this commit will result in a viable build.
-stage3-debug/bin/zig build update-zig1
-
-mkdir ../build-new
-cd ../build-new
-
-export CC="$ZIG cc -target $TARGET -mcpu=$MCPU"
-export CXX="$ZIG c++ -target $TARGET -mcpu=$MCPU"
-
-cmake .. \
-  -DCMAKE_PREFIX_PATH="$PREFIX" \
-  -DCMAKE_BUILD_TYPE=Debug \
-  -DZIG_TARGET_TRIPLE="$TARGET" \
-  -DZIG_TARGET_MCPU="$MCPU" \
-  -DZIG_STATIC=ON \
-  -DZIG_NO_LIB=ON \
-  -GNinja
-
-unset CC
-unset CXX
-
-ninja install
-
-stage3/bin/zig test ../test/behavior.zig
-stage3/bin/zig build -p stage4 \
-  -Dstatic-llvm \
-  -Dtarget=native-native-musl \
-  -Dno-lib \
-  --search-prefix "$PREFIX" \
-  --zig-lib-dir "$PWD/../lib"
-stage4/bin/zig test ../test/behavior.zig

doc/langref/test_global_assembly.zig

@@ -19,3 +19,4 @@ test "global assembly" {
 
 // test
 // target=x86_64-linux
+// llvm=true

lib/std/Target.zig

@@ -2581,12 +2581,16 @@ pub fn standardDynamicLinkerPath(target: Target) DynamicLinker {
 }
 
 pub fn ptrBitWidth_cpu_abi(cpu: Cpu, abi: Abi) u16 {
+    return ptrBitWidth_arch_abi(cpu.arch, abi);
+}
+
+pub fn ptrBitWidth_arch_abi(cpu_arch: Cpu.Arch, abi: Abi) u16 {
     switch (abi) {
         .gnux32, .muslx32, .gnuabin32, .muslabin32, .ilp32 => return 32,
         .gnuabi64, .muslabi64 => return 64,
         else => {},
     }
-    return switch (cpu.arch) {
+    return switch (cpu_arch) {
         .avr,
         .msp430,
         => 16,

lib/std/builtin.zig

@@ -61,7 +61,7 @@ pub const StackTrace = struct {
 
 /// This data structure is used by the Zig language code generation and
 /// therefore must be kept in sync with the compiler implementation.
-pub const GlobalLinkage = enum {
+pub const GlobalLinkage = enum(u2) {
     internal,
     strong,
     weak,
@@ -70,7 +70,7 @@ pub const GlobalLinkage = enum {
 
 /// This data structure is used by the Zig language code generation and
 /// therefore must be kept in sync with the compiler implementation.
-pub const SymbolVisibility = enum {
+pub const SymbolVisibility = enum(u2) {
     default,
     hidden,
     protected,
@@ -1030,8 +1030,19 @@ pub const ExternOptions = struct {
     name: []const u8,
     library_name: ?[]const u8 = null,
     linkage: GlobalLinkage = .strong,
+    visibility: SymbolVisibility = .default,
+    /// Setting this to `true` makes the `@extern` a runtime value.
     is_thread_local: bool = false,
     is_dll_import: bool = false,
+    relocation: Relocation = .any,
+
+    pub const Relocation = enum(u1) {
+        /// Any type of relocation is allowed.
+        any,
+        /// A program-counter-relative relocation is required.
+        /// Using this value makes the `@extern` a runtime value.
+        pcrel,
+    };
 };
 
 /// This data structure is used by the Zig language code generation and

lib/std/dynamic_library.zig

@@ -83,13 +83,16 @@ const RDebug = extern struct {
     r_ldbase: usize,
 };
 
-/// TODO make it possible to reference this same external symbol 2x so we don't need this
-/// helper function.
-pub fn get_DYNAMIC() ?[*]elf.Dyn {
-    return @extern([*]elf.Dyn, .{ .name = "_DYNAMIC", .linkage = .weak });
+/// TODO fix comparisons of extern symbol pointers so we don't need this helper function.
+pub fn get_DYNAMIC() ?[*]const elf.Dyn {
+    return @extern([*]const elf.Dyn, .{
+        .name = "_DYNAMIC",
+        .linkage = .weak,
+        .visibility = .hidden,
+    });
 }
 
-pub fn linkmap_iterator(phdrs: []elf.Phdr) error{InvalidExe}!LinkMap.Iterator {
+pub fn linkmap_iterator(phdrs: []const elf.Phdr) error{InvalidExe}!LinkMap.Iterator {
     _ = phdrs;
     const _DYNAMIC = get_DYNAMIC() orelse {
         // No PT_DYNAMIC means this is either a statically-linked program or a