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Merge pull request #21224 from alexrp/mips-gnu-fixes

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Fix MIPS PIC level and work around an LLVM bug for `mips(el)-linux-gnueabi(hf)`
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Andrew Kelley 2024-08-30 14:47:43 -07:00 committed by GitHub
commit e4e91a1314
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6 changed files with 34 additions and 27 deletions
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17
lib/std/zig/Server.zig
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@ -124,9 +124,9 @@ pub fn receiveMessage(s: *Server) !InMessage.Header {
const buf = fifo.readableSlice(0);
assert(fifo.readableLength() == buf.len);
if (buf.len >= @sizeOf(Header)) {
// workaround for https://github.com/ziglang/zig/issues/14904
const bytes_len = bswap_and_workaround_u32(buf[4..][0..4]);
const tag = bswap_and_workaround_tag(buf[0..][0..4]);
const header: *align(1) const Header = @ptrCast(buf[0..@sizeOf(Header)]);
const bytes_len = bswap(header.bytes_len);
const tag = bswap(header.tag);
if (buf.len - @sizeOf(Header) >= bytes_len) {
fifo.discard(@sizeOf(Header));
@ -307,17 +307,6 @@ fn bswap_u32_array(slice: []u32) void {
for (slice) |*elem| elem.* = @byteSwap(elem.*);
}
/// workaround for https://github.com/ziglang/zig/issues/14904
fn bswap_and_workaround_u32(bytes_ptr: *const [4]u8) u32 {
return std.mem.readInt(u32, bytes_ptr, .little);
}
/// workaround for https://github.com/ziglang/zig/issues/14904
fn bswap_and_workaround_tag(bytes_ptr: *const [4]u8) InMessage.Tag {
const int = std.mem.readInt(u32, bytes_ptr, .little);
return @as(InMessage.Tag, @enumFromInt(int));
}
const OutMessage = std.zig.Server.Message;
const InMessage = std.zig.Client.Message;

9
src/codegen/llvm.zig
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@ -1276,8 +1276,11 @@ pub const Object = struct {
);
errdefer target_machine.dispose();
if (pic) module.setModulePICLevel();
if (comp.config.pie) module.setModulePIELevel();
const large_pic = target_util.usesLargePIC(comp.root_mod.resolved_target.result);
if (pic) module.setModulePICLevel(large_pic);
if (comp.config.pie) module.setModulePIELevel(large_pic);
if (code_model != .Default) module.setModuleCodeModel(code_model);
if (comp.llvm_opt_bisect_limit >= 0) {
@ -1294,6 +1297,8 @@ pub const Object = struct {
.tsan = options.sanitize_thread,
.sancov = options.fuzz,
.lto = options.lto,
// https://github.com/ziglang/zig/issues/21215
.allow_fast_isel = !comp.root_mod.resolved_target.result.cpu.arch.isMIPS(),
.asm_filename = null,
.bin_filename = options.bin_path,
.llvm_ir_filename = options.post_ir_path,

5
src/codegen/llvm/bindings.zig
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@ -53,10 +53,10 @@ pub const Module = opaque {
extern fn LLVMDisposeModule(*Module) void;
pub const setModulePICLevel = ZigLLVMSetModulePICLevel;
extern fn ZigLLVMSetModulePICLevel(module: *Module) void;
extern fn ZigLLVMSetModulePICLevel(module: *Module, big: bool) void;
pub const setModulePIELevel = ZigLLVMSetModulePIELevel;
extern fn ZigLLVMSetModulePIELevel(module: *Module) void;
extern fn ZigLLVMSetModulePIELevel(module: *Module, large: bool) void;
pub const setModuleCodeModel = ZigLLVMSetModuleCodeModel;
extern fn ZigLLVMSetModuleCodeModel(module: *Module, code_model: CodeModel) void;
@ -91,6 +91,7 @@ pub const TargetMachine = opaque {
tsan: bool,
sancov: bool,
lto: bool,
allow_fast_isel: bool,
asm_filename: ?[*:0]const u8,
bin_filename: ?[*:0]const u8,
llvm_ir_filename: ?[*:0]const u8,

6
src/target.zig
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@ -49,6 +49,12 @@ pub fn requiresPIC(target: std.Target, linking_libc: bool) bool {
(target.abi == .ohos and target.cpu.arch == .aarch64);
}
pub fn usesLargePIC(target: std.Target) bool {
// MIPS always uses PIC level 1; other platforms vary in their default PIC levels, but they
// support both level 1 and 2, in which case we prefer 2.
return !target.cpu.arch.isMIPS();
}
/// This is not whether the target supports Position Independent Code, but whether the -fPIC
/// C compiler argument is valid to Clang.
pub fn supports_fpic(target: std.Target) bool {

17
src/zig_llvm.cpp
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@ -81,7 +81,7 @@ static const bool assertions_on = false;
LLVMTargetMachineRef ZigLLVMCreateTargetMachine(LLVMTargetRef T, const char *Triple,
const char *CPU, const char *Features, LLVMCodeGenOptLevel Level, LLVMRelocMode Reloc,
LLVMCodeModel CodeModel, bool function_sections, bool data_sections, ZigLLVMABIType float_abi,
LLVMCodeModel CodeModel, bool function_sections, bool data_sections, ZigLLVMABIType float_abi,
const char *abi_name)
{
std::optional<Reloc::Model> RM;
@ -258,7 +258,6 @@ ZIG_EXTERN_C bool ZigLLVMTargetMachineEmitToFile(LLVMTargetMachineRef targ_machi
options->bin_filename? options->bin_filename : options->asm_filename);
TargetMachine &target_machine = *reinterpret_cast<TargetMachine*>(targ_machine_ref);
target_machine.setO0WantsFastISel(true);
Module &llvm_module = *unwrap(module_ref);
@ -369,6 +368,12 @@ ZIG_EXTERN_C bool ZigLLVMTargetMachineEmitToFile(LLVMTargetMachineRef targ_machi
}
}
if (options.allow_fast_isel) {
target_machine.setO0WantsFastISel(true);
} else {
target_machine.setFastISel(false);
}
// Optimization phase
module_pm.run(llvm_module, module_am);
@ -430,12 +435,12 @@ void ZigLLVMParseCommandLineOptions(size_t argc, const char *const *argv) {
cl::ParseCommandLineOptions(argc, argv);
}
void ZigLLVMSetModulePICLevel(LLVMModuleRef module) {
unwrap(module)->setPICLevel(PICLevel::Level::BigPIC);
void ZigLLVMSetModulePICLevel(LLVMModuleRef module, bool big) {
unwrap(module)->setPICLevel(big ? PICLevel::Level::BigPIC : PICLevel::Level::SmallPIC);
}
void ZigLLVMSetModulePIELevel(LLVMModuleRef module) {
unwrap(module)->setPIELevel(PIELevel::Level::Large);
void ZigLLVMSetModulePIELevel(LLVMModuleRef module, bool large) {
unwrap(module)->setPIELevel(large ? PIELevel::Level::Large : PIELevel::Level::Small);
}
void ZigLLVMSetModuleCodeModel(LLVMModuleRef module, LLVMCodeModel code_model) {

7
src/zig_llvm.h
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@ -59,6 +59,7 @@ struct ZigLLVMEmitOptions {
bool tsan;
bool sancov;
bool lto;
bool allow_fast_isel;
const char *asm_filename;
const char *bin_filename;
const char *llvm_ir_filename;
@ -77,7 +78,7 @@ enum ZigLLVMABIType {
ZIG_EXTERN_C LLVMTargetMachineRef ZigLLVMCreateTargetMachine(LLVMTargetRef T, const char *Triple,
const char *CPU, const char *Features, LLVMCodeGenOptLevel Level, LLVMRelocMode Reloc,
LLVMCodeModel CodeModel, bool function_sections, bool data_sections, enum ZigLLVMABIType float_abi,
LLVMCodeModel CodeModel, bool function_sections, bool data_sections, enum ZigLLVMABIType float_abi,
const char *abi_name);
ZIG_EXTERN_C void ZigLLVMSetOptBisectLimit(LLVMContextRef context_ref, int limit);
@ -154,8 +155,8 @@ enum ZigLLVM_CallingConv {
ZigLLVM_MaxID = 1023,
};
ZIG_EXTERN_C void ZigLLVMSetModulePICLevel(LLVMModuleRef module);
ZIG_EXTERN_C void ZigLLVMSetModulePIELevel(LLVMModuleRef module);
ZIG_EXTERN_C void ZigLLVMSetModulePICLevel(LLVMModuleRef module, bool big);
ZIG_EXTERN_C void ZigLLVMSetModulePIELevel(LLVMModuleRef module, bool large);
ZIG_EXTERN_C void ZigLLVMSetModuleCodeModel(LLVMModuleRef module, LLVMCodeModel code_model);
ZIG_EXTERN_C void ZigLLVMParseCommandLineOptions(size_t argc, const char *const *argv);