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Merge pull request #5158 from ziglang/zir-to-elf

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beginnings of (non-LLVM) self-hosted machine code generation and linking
This commit is contained in:
Andrew Kelley
2020-04-24 15:37:21 -04:00
committed by GitHub
parent c829f2f7b7 9ebf25d145
commit 7634e67ba5
8 changed files with 1457 additions and 999 deletions
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lib/std/fs.zig
+4 -2
View File
@@ -1345,8 +1345,10 @@ pub const Dir = struct {
mode: File.Mode = File.default_mode,
};
/// `dest_path` must remain valid for the lifetime of `AtomicFile`.
/// Call `AtomicFile.finish` to atomically replace `dest_path` with contents.
/// Directly access the `.file` field, and then call `AtomicFile.finish`
/// to atomically replace `dest_path` with contents.
/// Always call `AtomicFile.deinit` to clean up, regardless of whether `AtomicFile.finish` succeeded.
/// `dest_path` must remain valid until `AtomicFile.deinit` is called.
pub fn atomicFile(self: Dir, dest_path: []const u8, options: AtomicFileOptions) !AtomicFile {
if (path.dirname(dest_path)) |dirname| {
const dir = try self.openDir(dirname, .{});
lib/std/fs/file.zig
+1 -1
View File
@@ -93,7 +93,7 @@ pub const File = struct {
/// This means that a process that does not respect the locking API can still get access
/// to the file, despite the lock.
///
/// Windows' file locks are mandatory, and any process attempting to access the file will
/// Windows's file locks are mandatory, and any process attempting to access the file will
/// receive an error.
///
/// [1]: https://www.kernel.org/doc/Documentation/filesystems/mandatory-locking.txt
lib/std/mem.zig
+15 -3
View File
@@ -2027,7 +2027,13 @@ test "sliceAsBytes and bytesAsSlice back" {
/// Round an address up to the nearest aligned address
/// The alignment must be a power of 2 and greater than 0.
pub fn alignForward(addr: usize, alignment: usize) usize {
return alignBackward(addr + (alignment - 1), alignment);
return alignForwardGeneric(usize, addr, alignment);
}
/// Round an address up to the nearest aligned address
/// The alignment must be a power of 2 and greater than 0.
pub fn alignForwardGeneric(comptime T: type, addr: T, alignment: T) T {
return alignBackwardGeneric(T, addr + (alignment - 1), alignment);
}
test "alignForward" {
@@ -2048,8 +2054,14 @@ test "alignForward" {
/// Round an address up to the previous aligned address
/// The alignment must be a power of 2 and greater than 0.
pub fn alignBackward(addr: usize, alignment: usize) usize {
assert(@popCount(usize, alignment) == 1);
// 000010000 // example addr
return alignBackwardGeneric(usize, addr, alignment);
}
/// Round an address up to the previous aligned address
/// The alignment must be a power of 2 and greater than 0.
pub fn alignBackwardGeneric(comptime T: type, addr: T, alignment: T) T {
assert(@popCount(T, alignment) == 1);
// 000010000 // example alignment
// 000001111 // subtract 1
// 111110000 // binary not
return addr & ~(alignment - 1);
src-self-hosted/codegen.zig
+489 -412
View File
@@ -1,447 +1,524 @@
const std = @import("std");
const Compilation = @import("compilation.zig").Compilation;
const llvm = @import("llvm.zig");
const c = @import("c.zig");
const ir = @import("ir.zig");
const Value = @import("value.zig").Value;
const Type = @import("type.zig").Type;
const Scope = @import("scope.zig").Scope;
const util = @import("util.zig");
const event = std.event;
const mem = std.mem;
const assert = std.debug.assert;
const DW = std.dwarf;
const maxInt = std.math.maxInt;
const ir = @import("ir.zig");
const Type = @import("type.zig").Type;
const Value = @import("value.zig").Value;
const Target = std.Target;
pub async fn renderToLlvm(comp: *Compilation, fn_val: *Value.Fn, code: *ir.Code) Compilation.BuildError!void {
fn_val.base.ref();
defer fn_val.base.deref(comp);
defer code.destroy(comp.gpa());
pub const ErrorMsg = struct {
byte_offset: usize,
msg: []const u8,
};
var output_path = try comp.createRandomOutputPath(comp.target.oFileExt());
errdefer output_path.deinit();
pub const Symbol = struct {
errors: []ErrorMsg,
const llvm_handle = try comp.zig_compiler.getAnyLlvmContext();
defer llvm_handle.release(comp.zig_compiler);
const context = llvm_handle.node.data;
const module = llvm.ModuleCreateWithNameInContext(comp.name.span(), context) orelse return error.OutOfMemory;
defer llvm.DisposeModule(module);
llvm.SetTarget(module, comp.llvm_triple.span());
llvm.SetDataLayout(module, comp.target_layout_str);
if (comp.target.getObjectFormat() == .coff) {
llvm.AddModuleCodeViewFlag(module);
} else {
llvm.AddModuleDebugInfoFlag(module);
}
const builder = llvm.CreateBuilderInContext(context) orelse return error.OutOfMemory;
defer llvm.DisposeBuilder(builder);
const dibuilder = llvm.CreateDIBuilder(module, true) orelse return error.OutOfMemory;
defer llvm.DisposeDIBuilder(dibuilder);
// Don't use ZIG_VERSION_STRING here. LLVM misparses it when it includes
// the git revision.
const producer = try std.fmt.allocPrintZ(&code.arena.allocator, "zig {}.{}.{}", .{
@as(u32, c.ZIG_VERSION_MAJOR),
@as(u32, c.ZIG_VERSION_MINOR),
@as(u32, c.ZIG_VERSION_PATCH),
});
const flags = "";
const runtime_version = 0;
const compile_unit_file = llvm.CreateFile(
dibuilder,
comp.name.span(),
comp.root_package.root_src_dir.span(),
) orelse return error.OutOfMemory;
const is_optimized = comp.build_mode != .Debug;
const compile_unit = llvm.CreateCompileUnit(
dibuilder,
DW.LANG_C99,
compile_unit_file,
producer,
is_optimized,
flags,
runtime_version,
"",
0,
!comp.strip,
) orelse return error.OutOfMemory;
var ofile = ObjectFile{
.comp = comp,
.module = module,
.builder = builder,
.dibuilder = dibuilder,
.context = context,
.lock = event.Lock.init(),
.arena = &code.arena.allocator,
};
try renderToLlvmModule(&ofile, fn_val, code);
// TODO module level assembly
//if (buf_len(&g->global_asm) != 0) {
// LLVMSetModuleInlineAsm(g->module, buf_ptr(&g->global_asm));
//}
llvm.DIBuilderFinalize(dibuilder);
if (comp.verbose_llvm_ir) {
std.debug.warn("raw module:\n", .{});
llvm.DumpModule(ofile.module);
}
// verify the llvm module when safety is on
if (std.debug.runtime_safety) {
var error_ptr: ?[*:0]u8 = null;
_ = llvm.VerifyModule(ofile.module, llvm.AbortProcessAction, &error_ptr);
}
const is_small = comp.build_mode == .ReleaseSmall;
const is_debug = comp.build_mode == .Debug;
var err_msg: [*:0]u8 = undefined;
// TODO integrate this with evented I/O
if (llvm.TargetMachineEmitToFile(
comp.target_machine,
module,
output_path.span(),
llvm.EmitBinary,
&err_msg,
is_debug,
is_small,
)) {
if (std.debug.runtime_safety) {
std.debug.panic("unable to write object file {}: {s}\n", .{ output_path.span(), err_msg });
pub fn deinit(self: *Symbol, allocator: *mem.Allocator) void {
for (self.errors) |err| {
allocator.free(err.msg);
}
return error.WritingObjectFileFailed;
}
//validate_inline_fns(g); TODO
fn_val.containing_object = output_path;
if (comp.verbose_llvm_ir) {
std.debug.warn("optimized module:\n", .{});
llvm.DumpModule(ofile.module);
}
if (comp.verbose_link) {
std.debug.warn("created {}\n", .{output_path.span()});
}
}
pub const ObjectFile = struct {
comp: *Compilation,
module: *llvm.Module,
builder: *llvm.Builder,
dibuilder: *llvm.DIBuilder,
context: *llvm.Context,
lock: event.Lock,
arena: *std.mem.Allocator,
fn gpa(self: *ObjectFile) *std.mem.Allocator {
return self.comp.gpa();
allocator.free(self.errors);
self.* = undefined;
}
};
pub fn renderToLlvmModule(ofile: *ObjectFile, fn_val: *Value.Fn, code: *ir.Code) !void {
// TODO audit more of codegen.cpp:fn_llvm_value and port more logic
const llvm_fn_type = try fn_val.base.typ.getLlvmType(ofile.arena, ofile.context);
const llvm_fn = llvm.AddFunction(
ofile.module,
fn_val.symbol_name.span(),
llvm_fn_type,
) orelse return error.OutOfMemory;
pub fn generateSymbol(typed_value: ir.TypedValue, module: ir.Module, code: *std.ArrayList(u8)) !Symbol {
switch (typed_value.ty.zigTypeTag()) {
.Fn => {
const index = typed_value.val.cast(Value.Payload.Function).?.index;
const module_fn = module.fns[index];
const want_fn_safety = fn_val.block_scope.?.safety.get(ofile.comp);
if (want_fn_safety and ofile.comp.haveLibC()) {
try addLLVMFnAttr(ofile, llvm_fn, "sspstrong");
try addLLVMFnAttrStr(ofile, llvm_fn, "stack-protector-buffer-size", "4");
var function = Function{
.module = &module,
.mod_fn = &module_fn,
.code = code,
.inst_table = std.AutoHashMap(*ir.Inst, Function.MCValue).init(code.allocator),
.errors = std.ArrayList(ErrorMsg).init(code.allocator),
};
defer function.inst_table.deinit();
defer function.errors.deinit();
for (module_fn.body) |inst| {
const new_inst = function.genFuncInst(inst) catch |err| switch (err) {
error.CodegenFail => {
assert(function.errors.items.len != 0);
break;
},
else => |e| return e,
};
try function.inst_table.putNoClobber(inst, new_inst);
}
return Symbol{ .errors = function.errors.toOwnedSlice() };
},
else => @panic("TODO implement generateSymbol for non-function types"),
}
}
const Function = struct {
module: *const ir.Module,
mod_fn: *const ir.Module.Fn,
code: *std.ArrayList(u8),
inst_table: std.AutoHashMap(*ir.Inst, MCValue),
errors: std.ArrayList(ErrorMsg),
const MCValue = union(enum) {
none,
unreach,
/// A pointer-sized integer that fits in a register.
immediate: u64,
/// The constant was emitted into the code, at this offset.
embedded_in_code: usize,
/// The value is in a target-specific register. The value can
/// be @intToEnum casted to the respective Reg enum.
register: usize,
};
fn genFuncInst(self: *Function, inst: *ir.Inst) !MCValue {
switch (inst.tag) {
.unreach => return self.genPanic(inst.src),
.constant => unreachable, // excluded from function bodies
.assembly => return self.genAsm(inst.cast(ir.Inst.Assembly).?),
.ptrtoint => return self.genPtrToInt(inst.cast(ir.Inst.PtrToInt).?),
.bitcast => return self.genBitCast(inst.cast(ir.Inst.BitCast).?),
}
}
// TODO
//if (fn_val.align_stack) |align_stack| {
// try addLLVMFnAttrInt(ofile, llvm_fn, "alignstack", align_stack);
//}
const fn_type = fn_val.base.typ.cast(Type.Fn).?;
const fn_type_normal = &fn_type.key.data.Normal;
try addLLVMFnAttr(ofile, llvm_fn, "nounwind");
//add_uwtable_attr(g, fn_table_entry->llvm_value);
try addLLVMFnAttr(ofile, llvm_fn, "nobuiltin");
//if (g->build_mode == BuildModeDebug && fn_table_entry->fn_inline != FnInlineAlways) {
// ZigLLVMAddFunctionAttr(fn_table_entry->llvm_value, "no-frame-pointer-elim", "true");
// ZigLLVMAddFunctionAttr(fn_table_entry->llvm_value, "no-frame-pointer-elim-non-leaf", nullptr);
//}
//if (fn_table_entry->section_name) {
// LLVMSetSection(fn_table_entry->llvm_value, buf_ptr(fn_table_entry->section_name));
//}
//if (fn_table_entry->align_bytes > 0) {
// LLVMSetAlignment(fn_table_entry->llvm_value, (unsigned)fn_table_entry->align_bytes);
//} else {
// // We'd like to set the best alignment for the function here, but on Darwin LLVM gives
// // "Cannot getTypeInfo() on a type that is unsized!" assertion failure when calling
// // any of the functions for getting alignment. Not specifying the alignment should
// // use the ABI alignment, which is fine.
//}
//if (!type_has_bits(return_type)) {
// // nothing to do
//} else if (type_is_codegen_pointer(return_type)) {
// addLLVMAttr(fn_table_entry->llvm_value, 0, "nonnull");
//} else if (handle_is_ptr(return_type) &&
// calling_convention_does_first_arg_return(fn_type->data.fn.fn_type_id.cc))
//{
// addLLVMArgAttr(fn_table_entry->llvm_value, 0, "sret");
// addLLVMArgAttr(fn_table_entry->llvm_value, 0, "nonnull");
//}
// TODO set parameter attributes
// TODO
//uint32_t err_ret_trace_arg_index = get_err_ret_trace_arg_index(g, fn_table_entry);
//if (err_ret_trace_arg_index != UINT32_MAX) {
// addLLVMArgAttr(fn_table_entry->llvm_value, (unsigned)err_ret_trace_arg_index, "nonnull");
//}
const cur_ret_ptr = if (fn_type_normal.return_type.handleIsPtr()) llvm.GetParam(llvm_fn, 0) else null;
// build all basic blocks
for (code.basic_block_list.span()) |bb| {
bb.llvm_block = llvm.AppendBasicBlockInContext(
ofile.context,
llvm_fn,
bb.name_hint,
) orelse return error.OutOfMemory;
fn genPanic(self: *Function, src: usize) !MCValue {
// TODO change this to call the panic function
switch (self.module.target.cpu.arch) {
.i386, .x86_64 => {
try self.code.append(0xcc); // int3
},
else => return self.fail(src, "TODO implement panic for {}", .{self.module.target.cpu.arch}),
}
return .unreach;
}
const entry_bb = code.basic_block_list.at(0);
llvm.PositionBuilderAtEnd(ofile.builder, entry_bb.llvm_block);
llvm.ClearCurrentDebugLocation(ofile.builder);
fn genRet(self: *Function, src: usize) !void {
// TODO change this to call the panic function
switch (self.module.target.cpu.arch) {
.i386, .x86_64 => {
try self.code.append(0xc3); // ret
},
else => return self.fail(src, "TODO implement ret for {}", .{self.module.target.cpu.arch}),
}
}
// TODO set up error return tracing
// TODO allocate temporary stack values
fn genRelativeFwdJump(self: *Function, src: usize, amount: u32) !void {
switch (self.module.target.cpu.arch) {
.i386, .x86_64 => {
if (amount <= std.math.maxInt(u8)) {
try self.code.resize(self.code.items.len + 2);
self.code.items[self.code.items.len - 2] = 0xeb;
self.code.items[self.code.items.len - 1] = @intCast(u8, amount);
} else {
try self.code.resize(self.code.items.len + 5);
self.code.items[self.code.items.len - 5] = 0xe9; // jmp rel32
const imm_ptr = self.code.items[self.code.items.len - 4 ..][0..4];
mem.writeIntLittle(u32, imm_ptr, amount);
}
},
else => return self.fail(src, "TODO implement relative forward jump for {}", .{self.module.target.cpu.arch}),
}
}
const var_list = fn_type.non_key.Normal.variable_list.span();
// create debug variable declarations for variables and allocate all local variables
for (var_list) |var_scope, i| {
const var_type = switch (var_scope.data) {
.Const => unreachable,
.Param => |param| param.typ,
};
// if (!type_has_bits(var->value->type)) {
// continue;
// }
// if (ir_get_var_is_comptime(var))
// continue;
// if (type_requires_comptime(var->value->type))
// continue;
// if (var->src_arg_index == SIZE_MAX) {
// var->value_ref = build_alloca(g, var->value->type, buf_ptr(&var->name), var->align_bytes);
fn genAsm(self: *Function, inst: *ir.Inst.Assembly) !MCValue {
// TODO convert to inline function
switch (self.module.target.cpu.arch) {
.arm => return self.genAsmArch(.arm, inst),
.armeb => return self.genAsmArch(.armeb, inst),
.aarch64 => return self.genAsmArch(.aarch64, inst),
.aarch64_be => return self.genAsmArch(.aarch64_be, inst),
.aarch64_32 => return self.genAsmArch(.aarch64_32, inst),
.arc => return self.genAsmArch(.arc, inst),
.avr => return self.genAsmArch(.avr, inst),
.bpfel => return self.genAsmArch(.bpfel, inst),
.bpfeb => return self.genAsmArch(.bpfeb, inst),
.hexagon => return self.genAsmArch(.hexagon, inst),
.mips => return self.genAsmArch(.mips, inst),
.mipsel => return self.genAsmArch(.mipsel, inst),
.mips64 => return self.genAsmArch(.mips64, inst),
.mips64el => return self.genAsmArch(.mips64el, inst),
.msp430 => return self.genAsmArch(.msp430, inst),
.powerpc => return self.genAsmArch(.powerpc, inst),
.powerpc64 => return self.genAsmArch(.powerpc64, inst),
.powerpc64le => return self.genAsmArch(.powerpc64le, inst),
.r600 => return self.genAsmArch(.r600, inst),
.amdgcn => return self.genAsmArch(.amdgcn, inst),
.riscv32 => return self.genAsmArch(.riscv32, inst),
.riscv64 => return self.genAsmArch(.riscv64, inst),
.sparc => return self.genAsmArch(.sparc, inst),
.sparcv9 => return self.genAsmArch(.sparcv9, inst),
.sparcel => return self.genAsmArch(.sparcel, inst),
.s390x => return self.genAsmArch(.s390x, inst),
.tce => return self.genAsmArch(.tce, inst),
.tcele => return self.genAsmArch(.tcele, inst),
.thumb => return self.genAsmArch(.thumb, inst),
.thumbeb => return self.genAsmArch(.thumbeb, inst),
.i386 => return self.genAsmArch(.i386, inst),
.x86_64 => return self.genAsmArch(.x86_64, inst),
.xcore => return self.genAsmArch(.xcore, inst),
.nvptx => return self.genAsmArch(.nvptx, inst),
.nvptx64 => return self.genAsmArch(.nvptx64, inst),
.le32 => return self.genAsmArch(.le32, inst),
.le64 => return self.genAsmArch(.le64, inst),
.amdil => return self.genAsmArch(.amdil, inst),
.amdil64 => return self.genAsmArch(.amdil64, inst),
.hsail => return self.genAsmArch(.hsail, inst),
.hsail64 => return self.genAsmArch(.hsail64, inst),
.spir => return self.genAsmArch(.spir, inst),
.spir64 => return self.genAsmArch(.spir64, inst),
.kalimba => return self.genAsmArch(.kalimba, inst),
.shave => return self.genAsmArch(.shave, inst),
.lanai => return self.genAsmArch(.lanai, inst),
.wasm32 => return self.genAsmArch(.wasm32, inst),
.wasm64 => return self.genAsmArch(.wasm64, inst),
.renderscript32 => return self.genAsmArch(.renderscript32, inst),
.renderscript64 => return self.genAsmArch(.renderscript64, inst),
.ve => return self.genAsmArch(.ve, inst),
}
}
// var->di_loc_var = ZigLLVMCreateAutoVariable(g->dbuilder, get_di_scope(g, var->parent_scope),
// buf_ptr(&var->name), import->di_file, (unsigned)(var->decl_node->line + 1),
// var->value->type->di_type, !g->strip_debug_symbols, 0);
fn genAsmArch(self: *Function, comptime arch: Target.Cpu.Arch, inst: *ir.Inst.Assembly) !MCValue {
if (arch != .x86_64 and arch != .i386) {
return self.fail(inst.base.src, "TODO implement inline asm support for more architectures", .{});
}
for (inst.args.inputs) |input, i| {
if (input.len < 3 or input[0] != '{' or input[input.len - 1] != '}') {
return self.fail(inst.base.src, "unrecognized asm input constraint: '{}'", .{input});
}
const reg_name = input[1 .. input.len - 1];
const reg = parseRegName(arch, reg_name) orelse
return self.fail(inst.base.src, "unrecognized register: '{}'", .{reg_name});
const arg = try self.resolveInst(inst.args.args[i]);
try self.genSetReg(inst.base.src, arch, reg, arg);
}
// } else {
// it's a parameter
// assert(var->gen_arg_index != SIZE_MAX);
// TypeTableEntry *gen_type;
// FnGenParamInfo *gen_info = &fn_table_entry->type_entry->data.fn.gen_param_info[var->src_arg_index];
if (var_type.handleIsPtr()) {
// if (gen_info->is_byval) {
// gen_type = var->value->type;
// } else {
// gen_type = gen_info->type;
// }
var_scope.data.Param.llvm_value = llvm.GetParam(llvm_fn, @intCast(c_uint, i));
if (mem.eql(u8, inst.args.asm_source, "syscall")) {
try self.code.appendSlice(&[_]u8{ 0x0f, 0x05 });
} else {
// gen_type = var->value->type;
var_scope.data.Param.llvm_value = try renderAlloca(ofile, var_type, var_scope.name, .Abi);
}
// if (var->decl_node) {
// var->di_loc_var = ZigLLVMCreateParameterVariable(g->dbuilder, get_di_scope(g, var->parent_scope),
// buf_ptr(&var->name), import->di_file,
// (unsigned)(var->decl_node->line + 1),
// gen_type->di_type, !g->strip_debug_symbols, 0, (unsigned)(var->gen_arg_index + 1));
// }
// }
}
// TODO finishing error return trace setup. we have to do this after all the allocas.
// create debug variable declarations for parameters
// rely on the first variables in the variable_list being parameters.
//size_t next_var_i = 0;
for (fn_type.key.data.Normal.params) |param, i| {
//FnGenParamInfo *info = &fn_table_entry->type_entry->data.fn.gen_param_info[param_i];
//if (info->gen_index == SIZE_MAX)
// continue;
const scope_var = var_list[i];
//assert(variable->src_arg_index != SIZE_MAX);
//next_var_i += 1;
//assert(variable);
//assert(variable->value_ref);
if (!param.typ.handleIsPtr()) {
//clear_debug_source_node(g);
const llvm_param = llvm.GetParam(llvm_fn, @intCast(c_uint, i));
_ = try renderStoreUntyped(
ofile,
llvm_param,
scope_var.data.Param.llvm_value,
.Abi,
.Non,
);
return self.fail(inst.base.src, "TODO implement support for more x86 assembly instructions", .{});
}
//if (variable->decl_node) {
// gen_var_debug_decl(g, variable);
//}
}
for (code.basic_block_list.span()) |current_block| {
llvm.PositionBuilderAtEnd(ofile.builder, current_block.llvm_block);
for (current_block.instruction_list.span()) |instruction| {
if (instruction.ref_count == 0 and !instruction.hasSideEffects()) continue;
instruction.llvm_value = try instruction.render(ofile, fn_val);
if (inst.args.output) |output| {
if (output.len < 4 or output[0] != '=' or output[1] != '{' or output[output.len - 1] != '}') {
return self.fail(inst.base.src, "unrecognized asm output constraint: '{}'", .{output});
}
const reg_name = output[2 .. output.len - 1];
const reg = parseRegName(arch, reg_name) orelse
return self.fail(inst.base.src, "unrecognized register: '{}'", .{reg_name});
return MCValue{ .register = @enumToInt(reg) };
} else {
return MCValue.none;
}
current_block.llvm_exit_block = llvm.GetInsertBlock(ofile.builder);
}
}
fn addLLVMAttr(
ofile: *ObjectFile,
val: *llvm.Value,
attr_index: llvm.AttributeIndex,
attr_name: []const u8,
) !void {
const kind_id = llvm.GetEnumAttributeKindForName(attr_name.ptr, attr_name.len);
assert(kind_id != 0);
const llvm_attr = llvm.CreateEnumAttribute(ofile.context, kind_id, 0) orelse return error.OutOfMemory;
llvm.AddAttributeAtIndex(val, attr_index, llvm_attr);
}
fn addLLVMAttrStr(
ofile: *ObjectFile,
val: *llvm.Value,
attr_index: llvm.AttributeIndex,
attr_name: []const u8,
attr_val: []const u8,
) !void {
const llvm_attr = llvm.CreateStringAttribute(
ofile.context,
attr_name.ptr,
@intCast(c_uint, attr_name.len),
attr_val.ptr,
@intCast(c_uint, attr_val.len),
) orelse return error.OutOfMemory;
llvm.AddAttributeAtIndex(val, attr_index, llvm_attr);
}
fn addLLVMAttrInt(
val: *llvm.Value,
attr_index: llvm.AttributeIndex,
attr_name: []const u8,
attr_val: u64,
) !void {
const kind_id = llvm.GetEnumAttributeKindForName(attr_name.ptr, attr_name.len);
assert(kind_id != 0);
const llvm_attr = llvm.CreateEnumAttribute(ofile.context, kind_id, attr_val) orelse return error.OutOfMemory;
llvm.AddAttributeAtIndex(val, attr_index, llvm_attr);
}
fn addLLVMFnAttr(ofile: *ObjectFile, fn_val: *llvm.Value, attr_name: []const u8) !void {
return addLLVMAttr(ofile, fn_val, maxInt(llvm.AttributeIndex), attr_name);
}
fn addLLVMFnAttrStr(ofile: *ObjectFile, fn_val: *llvm.Value, attr_name: []const u8, attr_val: []const u8) !void {
return addLLVMAttrStr(ofile, fn_val, maxInt(llvm.AttributeIndex), attr_name, attr_val);
}
fn addLLVMFnAttrInt(ofile: *ObjectFile, fn_val: *llvm.Value, attr_name: []const u8, attr_val: u64) !void {
return addLLVMAttrInt(ofile, fn_val, maxInt(llvm.AttributeIndex), attr_name, attr_val);
}
fn renderLoadUntyped(
ofile: *ObjectFile,
ptr: *llvm.Value,
alignment: Type.Pointer.Align,
vol: Type.Pointer.Vol,
name: [*:0]const u8,
) !*llvm.Value {
const result = llvm.BuildLoad(ofile.builder, ptr, name) orelse return error.OutOfMemory;
switch (vol) {
.Non => {},
.Volatile => llvm.SetVolatile(result, 1),
fn genSetReg(self: *Function, src: usize, comptime arch: Target.Cpu.Arch, reg: Reg(arch), mcv: MCValue) !void {
switch (arch) {
.x86_64 => switch (reg) {
.rax => switch (mcv) {
.none, .unreach => unreachable,
.immediate => |x| {
// Setting the eax register zeroes the upper part of rax, so if the number is small
// enough, that is preferable.
// Best case: zero
// 31 c0 xor eax,eax
if (x == 0) {
return self.code.appendSlice(&[_]u8{ 0x31, 0xc0 });
}
// Next best case: set eax with 4 bytes
// b8 04 03 02 01 mov eax,0x01020304
if (x <= std.math.maxInt(u32)) {
try self.code.resize(self.code.items.len + 5);
self.code.items[self.code.items.len - 5] = 0xb8;
const imm_ptr = self.code.items[self.code.items.len - 4 ..][0..4];
mem.writeIntLittle(u32, imm_ptr, @intCast(u32, x));
return;
}
// Worst case: set rax with 8 bytes
// 48 b8 08 07 06 05 04 03 02 01 movabs rax,0x0102030405060708
try self.code.resize(self.code.items.len + 10);
self.code.items[self.code.items.len - 10] = 0x48;
self.code.items[self.code.items.len - 9] = 0xb8;
const imm_ptr = self.code.items[self.code.items.len - 8 ..][0..8];
mem.writeIntLittle(u64, imm_ptr, x);
return;
},
.embedded_in_code => return self.fail(src, "TODO implement x86_64 genSetReg %rax = embedded_in_code", .{}),
.register => return self.fail(src, "TODO implement x86_64 genSetReg %rax = register", .{}),
},
.rdx => switch (mcv) {
.none, .unreach => unreachable,
.immediate => |x| {
// Setting the edx register zeroes the upper part of rdx, so if the number is small
// enough, that is preferable.
// Best case: zero
// 31 d2 xor edx,edx
if (x == 0) {
return self.code.appendSlice(&[_]u8{ 0x31, 0xd2 });
}
// Next best case: set edx with 4 bytes
// ba 04 03 02 01 mov edx,0x1020304
if (x <= std.math.maxInt(u32)) {
try self.code.resize(self.code.items.len + 5);
self.code.items[self.code.items.len - 5] = 0xba;
const imm_ptr = self.code.items[self.code.items.len - 4 ..][0..4];
mem.writeIntLittle(u32, imm_ptr, @intCast(u32, x));
return;
}
// Worst case: set rdx with 8 bytes
// 48 ba 08 07 06 05 04 03 02 01 movabs rdx,0x0102030405060708
try self.code.resize(self.code.items.len + 10);
self.code.items[self.code.items.len - 10] = 0x48;
self.code.items[self.code.items.len - 9] = 0xba;
const imm_ptr = self.code.items[self.code.items.len - 8 ..][0..8];
mem.writeIntLittle(u64, imm_ptr, x);
return;
},
.embedded_in_code => return self.fail(src, "TODO implement x86_64 genSetReg %rdx = embedded_in_code", .{}),
.register => return self.fail(src, "TODO implement x86_64 genSetReg %rdx = register", .{}),
},
.rdi => switch (mcv) {
.none, .unreach => unreachable,
.immediate => |x| {
// Setting the edi register zeroes the upper part of rdi, so if the number is small
// enough, that is preferable.
// Best case: zero
// 31 ff xor edi,edi
if (x == 0) {
return self.code.appendSlice(&[_]u8{ 0x31, 0xff });
}
// Next best case: set edi with 4 bytes
// bf 04 03 02 01 mov edi,0x1020304
if (x <= std.math.maxInt(u32)) {
try self.code.resize(self.code.items.len + 5);
self.code.items[self.code.items.len - 5] = 0xbf;
const imm_ptr = self.code.items[self.code.items.len - 4 ..][0..4];
mem.writeIntLittle(u32, imm_ptr, @intCast(u32, x));
return;
}
// Worst case: set rdi with 8 bytes
// 48 bf 08 07 06 05 04 03 02 01 movabs rax,0x0102030405060708
try self.code.resize(self.code.items.len + 10);
self.code.items[self.code.items.len - 10] = 0x48;
self.code.items[self.code.items.len - 9] = 0xbf;
const imm_ptr = self.code.items[self.code.items.len - 8 ..][0..8];
mem.writeIntLittle(u64, imm_ptr, x);
return;
},
.embedded_in_code => return self.fail(src, "TODO implement x86_64 genSetReg %rdi = embedded_in_code", .{}),
.register => return self.fail(src, "TODO implement x86_64 genSetReg %rdi = register", .{}),
},
.rsi => switch (mcv) {
.none, .unreach => unreachable,
.immediate => return self.fail(src, "TODO implement x86_64 genSetReg %rsi = immediate", .{}),
.embedded_in_code => |code_offset| {
// Examples:
// lea rsi, [rip + 0x01020304]
// lea rsi, [rip - 7]
// f: 48 8d 35 04 03 02 01 lea rsi,[rip+0x1020304] # 102031a <_start+0x102031a>
// 16: 48 8d 35 f9 ff ff ff lea rsi,[rip+0xfffffffffffffff9] # 16 <_start+0x16>
//
// We need the offset from RIP in a signed i32 twos complement.
// The instruction is 7 bytes long and RIP points to the next instruction.
try self.code.resize(self.code.items.len + 7);
const rip = self.code.items.len;
const big_offset = @intCast(i64, code_offset) - @intCast(i64, rip);
const offset = @intCast(i32, big_offset);
self.code.items[self.code.items.len - 7] = 0x48;
self.code.items[self.code.items.len - 6] = 0x8d;
self.code.items[self.code.items.len - 5] = 0x35;
const imm_ptr = self.code.items[self.code.items.len - 4 ..][0..4];
mem.writeIntLittle(i32, imm_ptr, offset);
return;
},
.register => return self.fail(src, "TODO implement x86_64 genSetReg %rsi = register", .{}),
},
else => return self.fail(src, "TODO implement genSetReg for x86_64 '{}'", .{@tagName(reg)}),
},
else => return self.fail(src, "TODO implement genSetReg for more architectures", .{}),
}
}
llvm.SetAlignment(result, resolveAlign(ofile, alignment, llvm.GetElementType(llvm.TypeOf(ptr))));
return result;
}
fn renderLoad(ofile: *ObjectFile, ptr: *llvm.Value, ptr_type: *Type.Pointer, name: [*:0]const u8) !*llvm.Value {
return renderLoadUntyped(ofile, ptr, ptr_type.key.alignment, ptr_type.key.vol, name);
}
pub fn getHandleValue(ofile: *ObjectFile, ptr: *llvm.Value, ptr_type: *Type.Pointer) !?*llvm.Value {
const child_type = ptr_type.key.child_type;
if (!child_type.hasBits()) {
return null;
fn genPtrToInt(self: *Function, inst: *ir.Inst.PtrToInt) !MCValue {
// no-op
return self.resolveInst(inst.args.ptr);
}
if (child_type.handleIsPtr()) {
return ptr;
fn genBitCast(self: *Function, inst: *ir.Inst.BitCast) !MCValue {
const operand = try self.resolveInst(inst.args.operand);
return operand;
}
return try renderLoad(ofile, ptr, ptr_type, "");
}
pub fn renderStoreUntyped(
ofile: *ObjectFile,
value: *llvm.Value,
ptr: *llvm.Value,
alignment: Type.Pointer.Align,
vol: Type.Pointer.Vol,
) !*llvm.Value {
const result = llvm.BuildStore(ofile.builder, value, ptr) orelse return error.OutOfMemory;
switch (vol) {
.Non => {},
.Volatile => llvm.SetVolatile(result, 1),
fn resolveInst(self: *Function, inst: *ir.Inst) !MCValue {
if (self.inst_table.getValue(inst)) |mcv| {
return mcv;
}
if (inst.cast(ir.Inst.Constant)) |const_inst| {
const mcvalue = try self.genTypedValue(inst.src, .{ .ty = inst.ty, .val = const_inst.val });
try self.inst_table.putNoClobber(inst, mcvalue);
return mcvalue;
} else {
return self.inst_table.getValue(inst).?;
}
}
llvm.SetAlignment(result, resolveAlign(ofile, alignment, llvm.TypeOf(value)));
return result;
}
pub fn renderStore(
ofile: *ObjectFile,
value: *llvm.Value,
ptr: *llvm.Value,
ptr_type: *Type.Pointer,
) !*llvm.Value {
return renderStoreUntyped(ofile, value, ptr, ptr_type.key.alignment, ptr_type.key.vol);
}
fn genTypedValue(self: *Function, src: usize, typed_value: ir.TypedValue) !MCValue {
switch (typed_value.ty.zigTypeTag()) {
.Pointer => {
const ptr_elem_type = typed_value.ty.elemType();
switch (ptr_elem_type.zigTypeTag()) {
.Array => {
// TODO more checks to make sure this can be emitted as a string literal
const bytes = try typed_value.val.toAllocatedBytes(self.code.allocator);
defer self.code.allocator.free(bytes);
const smaller_len = std.math.cast(u32, bytes.len) catch
return self.fail(src, "TODO handle a larger string constant", .{});
pub fn renderAlloca(
ofile: *ObjectFile,
var_type: *Type,
name: []const u8,
alignment: Type.Pointer.Align,
) !*llvm.Value {
const llvm_var_type = try var_type.getLlvmType(ofile.arena, ofile.context);
const name_with_null = try std.cstr.addNullByte(ofile.arena, name);
const result = llvm.BuildAlloca(ofile.builder, llvm_var_type, @ptrCast([*:0]const u8, name_with_null.ptr)) orelse return error.OutOfMemory;
llvm.SetAlignment(result, resolveAlign(ofile, alignment, llvm_var_type));
return result;
}
// Emit the string literal directly into the code; jump over it.
try self.genRelativeFwdJump(src, smaller_len);
const offset = self.code.items.len;
try self.code.appendSlice(bytes);
return MCValue{ .embedded_in_code = offset };
},
else => |t| return self.fail(src, "TODO implement emitTypedValue for pointer to '{}'", .{@tagName(t)}),
}
},
.Int => {
const info = typed_value.ty.intInfo(self.module.target);
const ptr_bits = self.module.target.cpu.arch.ptrBitWidth();
if (info.bits > ptr_bits or info.signed) {
return self.fail(src, "TODO const int bigger than ptr and signed int", .{});
}
return MCValue{ .immediate = typed_value.val.toUnsignedInt() };
},
.ComptimeInt => unreachable, // semantic analysis prevents this
.ComptimeFloat => unreachable, // semantic analysis prevents this
else => return self.fail(src, "TODO implement const of type '{}'", .{typed_value.ty}),
}
}
pub fn resolveAlign(ofile: *ObjectFile, alignment: Type.Pointer.Align, llvm_type: *llvm.Type) u32 {
return switch (alignment) {
.Abi => return llvm.ABIAlignmentOfType(ofile.comp.target_data_ref, llvm_type),
.Override => |a| a,
fn fail(self: *Function, src: usize, comptime format: []const u8, args: var) error{ CodegenFail, OutOfMemory } {
@setCold(true);
const msg = try std.fmt.allocPrint(self.errors.allocator, format, args);
{
errdefer self.errors.allocator.free(msg);
(try self.errors.addOne()).* = .{
.byte_offset = src,
.msg = msg,
};
}
return error.CodegenFail;
}
};
fn Reg(comptime arch: Target.Cpu.Arch) type {
return switch (arch) {
.i386 => enum {
eax,
ebx,
ecx,
edx,
ebp,
esp,
esi,
edi,
ax,
bx,
cx,
dx,
bp,
sp,
si,
di,
ah,
bh,
ch,
dh,
al,
bl,
cl,
dl,
},
.x86_64 => enum {
rax,
rbx,
rcx,
rdx,
rbp,
rsp,
rsi,
rdi,
r8,
r9,
r10,
r11,
r12,
r13,
r14,
r15,
eax,
ebx,
ecx,
edx,
ebp,
esp,
esi,
edi,
r8d,
r9d,
r10d,
r11d,
r12d,
r13d,
r14d,
r15d,
ax,
bx,
cx,
dx,
bp,
sp,
si,
di,
r8w,
r9w,
r10w,
r11w,
r12w,
r13w,
r14w,
r15w,
ah,
bh,
ch,
dh,
al,
bl,
cl,
dl,
r8b,
r9b,
r10b,
r11b,
r12b,
r13b,
r14b,
r15b,
},
else => @compileError("TODO add more register enums"),
};
}
fn parseRegName(comptime arch: Target.Cpu.Arch, name: []const u8) ?Reg(arch) {
return std.meta.stringToEnum(Reg(arch), name);
}
src-self-hosted/ir.zig
+61 -19
View File
@@ -24,6 +24,7 @@ pub const Inst = struct {
constant,
assembly,
ptrtoint,
bitcast,
};
pub fn cast(base: *Inst, comptime T: type) ?*T {
@@ -45,6 +46,7 @@ pub const Inst = struct {
.assembly,
.ptrtoint,
.bitcast,
=> null,
};
}
@@ -84,6 +86,15 @@ pub const Inst = struct {
ptr: *Inst,
},
};
pub const BitCast = struct {
pub const base_tag = Tag.bitcast;
base: Inst,
args: struct {
operand: *Inst,
},
};
};
pub const TypedValue = struct {
@@ -96,6 +107,7 @@ pub const Module = struct {
errors: []ErrorMsg,
arena: std.heap.ArenaAllocator,
fns: []Fn,
target: Target,
pub const Export = struct {
name: []const u8,
@@ -122,9 +134,7 @@ pub const ErrorMsg = struct {
msg: []const u8,
};
pub fn analyze(allocator: *Allocator, old_module: text.Module) !Module {
const native_info = try std.zig.system.NativeTargetInfo.detect(allocator, .{});
pub fn analyze(allocator: *Allocator, old_module: text.Module, target: Target) !Module {
var ctx = Analyze{
.allocator = allocator,
.arena = std.heap.ArenaAllocator.init(allocator),
@@ -133,7 +143,7 @@ pub fn analyze(allocator: *Allocator, old_module: text.Module) !Module {
.decl_table = std.AutoHashMap(*text.Inst, Analyze.NewDecl).init(allocator),
.exports = std.ArrayList(Module.Export).init(allocator),
.fns = std.ArrayList(Module.Fn).init(allocator),
.target = native_info.target,
.target = target,
};
defer ctx.errors.deinit();
defer ctx.decl_table.deinit();
@@ -152,6 +162,7 @@ pub fn analyze(allocator: *Allocator, old_module: text.Module) !Module {
.errors = ctx.errors.toOwnedSlice(),
.fns = ctx.fns.toOwnedSlice(),
.arena = ctx.arena,
.target = target,
};
}
@@ -234,7 +245,7 @@ const Analyze = struct {
fn resolveConstString(self: *Analyze, func: ?*Fn, old_inst: *text.Inst) ![]u8 {
const new_inst = try self.resolveInst(func, old_inst);
const wanted_type = Type.initTag(.const_slice_u8);
const coerced_inst = try self.coerce(wanted_type, new_inst);
const coerced_inst = try self.coerce(func, wanted_type, new_inst);
const val = try self.resolveConstValue(coerced_inst);
return val.toAllocatedBytes(&self.arena.allocator);
}
@@ -242,7 +253,7 @@ const Analyze = struct {
fn resolveType(self: *Analyze, func: ?*Fn, old_inst: *text.Inst) !Type {
const new_inst = try self.resolveInst(func, old_inst);
const wanted_type = Type.initTag(.@"type");
const coerced_inst = try self.coerce(wanted_type, new_inst);
const coerced_inst = try self.coerce(func, wanted_type, new_inst);
const val = try self.resolveConstValue(coerced_inst);
return val.toType();
}
@@ -409,6 +420,7 @@ const Analyze = struct {
.primitive => return self.analyzeInstPrimitive(func, old_inst.cast(text.Inst.Primitive).?),
.fntype => return self.analyzeInstFnType(func, old_inst.cast(text.Inst.FnType).?),
.intcast => return self.analyzeInstIntCast(func, old_inst.cast(text.Inst.IntCast).?),
.bitcast => return self.analyzeInstBitCast(func, old_inst.cast(text.Inst.BitCast).?),
}
}
@@ -472,7 +484,7 @@ const Analyze = struct {
fn analyzeInstAs(self: *Analyze, func: ?*Fn, as: *text.Inst.As) InnerError!*Inst {
const dest_type = try self.resolveType(func, as.positionals.dest_type);
const new_inst = try self.resolveInst(func, as.positionals.value);
return self.coerce(dest_type, new_inst);
return self.coerce(func, dest_type, new_inst);
}
fn analyzeInstPtrToInt(self: *Analyze, func: ?*Fn, ptrtoint: *text.Inst.PtrToInt) InnerError!*Inst {
@@ -545,12 +557,18 @@ const Analyze = struct {
}
if (dest_is_comptime_int or new_inst.value() != null) {
return self.coerce(dest_type, new_inst);
return self.coerce(func, dest_type, new_inst);
}
return self.fail(intcast.base.src, "TODO implement analyze widen or shorten int", .{});
}
fn analyzeInstBitCast(self: *Analyze, func: ?*Fn, inst: *text.Inst.BitCast) InnerError!*Inst {
const dest_type = try self.resolveType(func, inst.positionals.dest_type);
const operand = try self.resolveInst(func, inst.positionals.operand);
return self.bitcast(func, dest_type, operand);
}
fn analyzeInstDeref(self: *Analyze, func: ?*Fn, deref: *text.Inst.Deref) InnerError!*Inst {
const ptr = try self.resolveInst(func, deref.positionals.ptr);
const elem_ty = switch (ptr.ty.zigTypeTag()) {
@@ -583,7 +601,8 @@ const Analyze = struct {
elem.* = try self.resolveConstString(func, assembly.kw_args.clobbers[i]);
}
for (args) |*elem, i| {
elem.* = try self.resolveInst(func, assembly.kw_args.args[i]);
const arg = try self.resolveInst(func, assembly.kw_args.args[i]);
elem.* = try self.coerce(func, Type.initTag(.usize), arg);
}
const f = try self.requireFunctionBody(func, assembly.base.src);
@@ -602,10 +621,14 @@ const Analyze = struct {
return self.addNewInstArgs(f, unreach.base.src, Type.initTag(.noreturn), Inst.Unreach, {});
}
fn coerce(self: *Analyze, dest_type: Type, inst: *Inst) !*Inst {
fn coerce(self: *Analyze, func: ?*Fn, dest_type: Type, inst: *Inst) !*Inst {
// If the types are the same, we can return the operand.
if (dest_type.eql(inst.ty))
return inst;
const in_memory_result = coerceInMemoryAllowed(dest_type, inst.ty);
if (in_memory_result == .ok) {
return self.bitcast(dest_type, inst);
return self.bitcast(func, dest_type, inst);
}
// *[N]T to []T
@@ -634,12 +657,14 @@ const Analyze = struct {
return self.fail(inst.src, "TODO implement type coercion", .{});
}
fn bitcast(self: *Analyze, dest_type: Type, inst: *Inst) !*Inst {
fn bitcast(self: *Analyze, func: ?*Fn, dest_type: Type, inst: *Inst) !*Inst {
if (inst.value()) |val| {
// Keep the comptime Value representation; take the new type.
return self.constInst(inst.src, .{ .ty = dest_type, .val = val });
}
return self.fail(inst.src, "TODO implement runtime bitcast", .{});
// TODO validate the type size and other compile errors
const f = try self.requireFunctionBody(func, inst.src);
return self.addNewInstArgs(f, inst.src, dest_type, Inst.BitCast, Inst.Args(Inst.BitCast){ .operand = inst });
}
fn coerceArrayPtrToSlice(self: *Analyze, dest_type: Type, inst: *Inst) !*Inst {
@@ -699,7 +724,9 @@ pub fn main() anyerror!void {
std.process.exit(1);
}
var analyzed_module = try analyze(allocator, zir_module);
const native_info = try std.zig.system.NativeTargetInfo.detect(allocator, .{});
var analyzed_module = try analyze(allocator, zir_module, native_info.target);
defer analyzed_module.deinit(allocator);
if (analyzed_module.errors.len != 0) {
@@ -711,12 +738,27 @@ pub fn main() anyerror!void {
std.process.exit(1);
}
var new_zir_module = try text.emit_zir(allocator, analyzed_module);
defer new_zir_module.deinit(allocator);
const output_zir = true;
if (output_zir) {
var new_zir_module = try text.emit_zir(allocator, analyzed_module);
defer new_zir_module.deinit(allocator);
var bos = std.io.bufferedOutStream(std.io.getStdOut().outStream());
try new_zir_module.writeToStream(allocator, bos.outStream());
try bos.flush();
var bos = std.io.bufferedOutStream(std.io.getStdOut().outStream());
try new_zir_module.writeToStream(allocator, bos.outStream());
try bos.flush();
}
const link = @import("link.zig");
var result = try link.updateExecutableFilePath(allocator, analyzed_module, std.fs.cwd(), "a.out");
defer result.deinit(allocator);
if (result.errors.len != 0) {
for (result.errors) |err_msg| {
const loc = findLineColumn(source, err_msg.byte_offset);
std.debug.warn("{}:{}:{}: error: {}\n", .{ src_path, loc.line + 1, loc.column + 1, err_msg.msg });
}
if (debug_error_trace) return error.ParseFailure;
std.process.exit(1);
}
}
fn findLineColumn(source: []const u8, byte_offset: usize) struct { line: usize, column: usize } {
src-self-hosted/ir/text.zig
+27
View File
@@ -31,6 +31,7 @@ pub const Inst = struct {
primitive,
fntype,
intcast,
bitcast,
};
pub fn TagToType(tag: Tag) type {
@@ -48,6 +49,7 @@ pub const Inst = struct {
.primitive => Primitive,
.fntype => FnType,
.intcast => IntCast,
.bitcast => BitCast,
};
}
@@ -258,6 +260,17 @@ pub const Inst = struct {
},
kw_args: struct {},
};
pub const BitCast = struct {
pub const base_tag = Tag.bitcast;
base: Inst,
positionals: struct {
dest_type: *Inst,
operand: *Inst,
},
kw_args: struct {},
};
};
pub const ErrorMsg = struct {
@@ -331,6 +344,7 @@ pub const Module = struct {
.primitive => return self.writeInstToStreamGeneric(stream, .primitive, decl, inst_table),
.fntype => return self.writeInstToStreamGeneric(stream, .fntype, decl, inst_table),
.intcast => return self.writeInstToStreamGeneric(stream, .intcast, decl, inst_table),
.bitcast => return self.writeInstToStreamGeneric(stream, .bitcast, decl, inst_table),
}
}
@@ -957,6 +971,19 @@ const EmitZIR = struct {
};
break :blk &new_inst.base;
},
.bitcast => blk: {
const old_inst = inst.cast(ir.Inst.BitCast).?;
const new_inst = try self.arena.allocator.create(Inst.BitCast);
new_inst.* = .{
.base = .{ .src = inst.src, .tag = Inst.BitCast.base_tag },
.positionals = .{
.dest_type = try self.emitType(inst.src, inst.ty),
.operand = try self.resolveInst(&inst_table, old_inst.args.operand),
},
.kw_args = .{},
};
break :blk &new_inst.base;
},
};
try instructions.append(new_inst);
try inst_table.putNoClobber(inst, new_inst);
src-self-hosted/link.zig
+810 -562
View File
@@ -1,576 +1,824 @@
const std = @import("std");
const mem = std.mem;
const c = @import("c.zig");
const Compilation = @import("compilation.zig").Compilation;
const Target = std.Target;
const ObjectFormat = Target.ObjectFormat;
const LibCInstallation = @import("libc_installation.zig").LibCInstallation;
const assert = std.debug.assert;
const util = @import("util.zig");
const Allocator = std.mem.Allocator;
const ir = @import("ir.zig");
const fs = std.fs;
const elf = std.elf;
const codegen = @import("codegen.zig");
const Context = struct {
comp: *Compilation,
arena: std.heap.ArenaAllocator,
args: std.ArrayList([*:0]const u8),
link_in_crt: bool,
/// On common systems with a 0o022 umask, 0o777 will still result in a file created
/// with 0o755 permissions, but it works appropriately if the system is configured
/// more leniently. As another data point, C's fopen seems to open files with the
/// 666 mode.
const executable_mode = 0o777;
const default_entry_addr = 0x8000000;
link_err: error{OutOfMemory}!void,
link_msg: std.ArrayListSentineled(u8, 0),
libc: *LibCInstallation,
out_file_path: std.ArrayListSentineled(u8, 0),
pub const ErrorMsg = struct {
byte_offset: usize,
msg: []const u8,
};
pub fn link(comp: *Compilation) !void {
var ctx = Context{
.comp = comp,
.arena = std.heap.ArenaAllocator.init(comp.gpa()),
.args = undefined,
.link_in_crt = comp.haveLibC() and comp.kind == .Exe,
.link_err = {},
.link_msg = undefined,
.libc = undefined,
.out_file_path = undefined,
};
defer ctx.arena.deinit();
ctx.args = std.ArrayList([*:0]const u8).init(&ctx.arena.allocator);
ctx.link_msg = std.ArrayListSentineled(u8, 0).initNull(&ctx.arena.allocator);
pub const Result = struct {
errors: []ErrorMsg,
ctx.out_file_path = try std.ArrayListSentineled(u8, 0).init(&ctx.arena.allocator, comp.name.span());
switch (comp.kind) {
.Exe => {
try ctx.out_file_path.append(comp.target.exeFileExt());
},
.Lib => {
try ctx.out_file_path.append(if (comp.is_static) comp.target.staticLibSuffix() else comp.target.dynamicLibSuffix());
},
.Obj => {
try ctx.out_file_path.append(comp.target.oFileExt());
},
}
// even though we're calling LLD as a library it thinks the first
// argument is its own exe name
try ctx.args.append("lld");
if (comp.haveLibC()) {
// TODO https://github.com/ziglang/zig/issues/3190
var libc = ctx.comp.override_libc orelse blk: {
@panic("this code has bitrotted");
//switch (comp.target) {
// Target.Native => {
// break :blk comp.zig_compiler.getNativeLibC() catch return error.LibCRequiredButNotProvidedOrFound;
// },
// else => return error.LibCRequiredButNotProvidedOrFound,
//}
};
ctx.libc = libc;
}
try constructLinkerArgs(&ctx);
if (comp.verbose_link) {
for (ctx.args.span()) |arg, i| {
const space = if (i == 0) "" else " ";
std.debug.warn("{}{s}", .{ space, arg });
pub fn deinit(self: *Result, allocator: *mem.Allocator) void {
for (self.errors) |err| {
allocator.free(err.msg);
}
std.debug.warn("\n", .{});
}
const extern_ofmt = toExternObjectFormatType(comp.target.getObjectFormat());
const args_slice = ctx.args.span();
{
// LLD is not thread-safe, so we grab a global lock.
const held = comp.zig_compiler.lld_lock.acquire();
defer held.release();
// Not evented I/O. LLD does its own multithreading internally.
if (!ZigLLDLink(extern_ofmt, args_slice.ptr, args_slice.len, linkDiagCallback, @ptrCast(*c_void, &ctx))) {
if (!ctx.link_msg.isNull()) {
// TODO capture these messages and pass them through the system, reporting them through the
// event system instead of printing them directly here.
// perhaps try to parse and understand them.
std.debug.warn("{}\n", .{ctx.link_msg.span()});
}
return error.LinkFailed;
}
}
}
extern fn ZigLLDLink(
oformat: c.ZigLLVM_ObjectFormatType,
args: [*]const [*]const u8,
arg_count: usize,
append_diagnostic: extern fn (*c_void, [*]const u8, usize) void,
context: *c_void,
) bool;
fn linkDiagCallback(context: *c_void, ptr: [*]const u8, len: usize) callconv(.C) void {
const ctx = @ptrCast(*Context, @alignCast(@alignOf(Context), context));
ctx.link_err = linkDiagCallbackErrorable(ctx, ptr[0..len]);
}
fn linkDiagCallbackErrorable(ctx: *Context, msg: []const u8) !void {
if (ctx.link_msg.isNull()) {
try ctx.link_msg.resize(0);
}
try ctx.link_msg.append(msg);
}
fn toExternObjectFormatType(ofmt: ObjectFormat) c.ZigLLVM_ObjectFormatType {
return switch (ofmt) {
.unknown => .ZigLLVM_UnknownObjectFormat,
.coff => .ZigLLVM_COFF,
.elf => .ZigLLVM_ELF,
.macho => .ZigLLVM_MachO,
.wasm => .ZigLLVM_Wasm,
};
}
fn constructLinkerArgs(ctx: *Context) !void {
switch (ctx.comp.target.getObjectFormat()) {
.unknown => unreachable,
.coff => return constructLinkerArgsCoff(ctx),
.elf => return constructLinkerArgsElf(ctx),
.macho => return constructLinkerArgsMachO(ctx),
.wasm => return constructLinkerArgsWasm(ctx),
}
}
fn constructLinkerArgsElf(ctx: *Context) !void {
// TODO commented out code in this function
//if (g->linker_script) {
// lj->args.append("-T");
// lj->args.append(g->linker_script);
//}
try ctx.args.append("--gc-sections");
if (ctx.comp.link_eh_frame_hdr) {
try ctx.args.append("--eh-frame-hdr");
}
//lj->args.append("-m");
//lj->args.append(getLDMOption(&g->zig_target));
//bool is_lib = g->out_type == OutTypeLib;
//bool shared = !g->is_static && is_lib;
//Buf *soname = nullptr;
if (ctx.comp.is_static) {
//if (util.isArmOrThumb(ctx.comp.target)) {
// try ctx.args.append("-Bstatic");
//} else {
// try ctx.args.append("-static");
//}
}
//} else if (shared) {
// lj->args.append("-shared");
// if (buf_len(&lj->out_file) == 0) {
// buf_appendf(&lj->out_file, "lib%s.so.%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".%" ZIG_PRI_usize "",
// buf_ptr(g->root_out_name), g->version_major, g->version_minor, g->version_patch);
// }
// soname = buf_sprintf("lib%s.so.%" ZIG_PRI_usize "", buf_ptr(g->root_out_name), g->version_major);
//}
try ctx.args.append("-o");
try ctx.args.append(ctx.out_file_path.span());
if (ctx.link_in_crt) {
const crt1o = if (ctx.comp.is_static) "crt1.o" else "Scrt1.o";
try addPathJoin(ctx, ctx.libc.crt_dir.?, crt1o);
try addPathJoin(ctx, ctx.libc.crt_dir.?, "crti.o");
}
if (ctx.comp.haveLibC()) {
try ctx.args.append("-L");
// TODO addNullByte should probably return [:0]u8
try ctx.args.append(@ptrCast([*:0]const u8, (try std.cstr.addNullByte(&ctx.arena.allocator, ctx.libc.crt_dir.?)).ptr));
//if (!ctx.comp.is_static) {
// const dl = blk: {
// //if (ctx.libc.dynamic_linker_path) |dl| break :blk dl;
// //if (util.getDynamicLinkerPath(ctx.comp.target)) |dl| break :blk dl;
// return error.LibCMissingDynamicLinker;
// };
// try ctx.args.append("-dynamic-linker");
// try ctx.args.append(@ptrCast([*:0]const u8, (try std.cstr.addNullByte(&ctx.arena.allocator, dl)).ptr));
//}
}
//if (shared) {
// lj->args.append("-soname");
// lj->args.append(buf_ptr(soname));
//}
// .o files
for (ctx.comp.link_objects) |link_object| {
const link_obj_with_null = try std.cstr.addNullByte(&ctx.arena.allocator, link_object);
try ctx.args.append(@ptrCast([*:0]const u8, link_obj_with_null.ptr));
}
try addFnObjects(ctx);
//if (g->out_type == OutTypeExe || g->out_type == OutTypeLib) {
// if (g->libc_link_lib == nullptr) {
// Buf *builtin_o_path = build_o(g, "builtin");
// lj->args.append(buf_ptr(builtin_o_path));
// }
// // sometimes libgcc is missing stuff, so we still build compiler_rt and rely on weak linkage
// Buf *compiler_rt_o_path = build_compiler_rt(g);
// lj->args.append(buf_ptr(compiler_rt_o_path));
//}
//for (size_t i = 0; i < g->link_libs_list.length; i += 1) {
// LinkLib *link_lib = g->link_libs_list.at(i);
// if (buf_eql_str(link_lib->name, "c")) {
// continue;
// }
// Buf *arg;
// if (buf_starts_with_str(link_lib->name, "/") || buf_ends_with_str(link_lib->name, ".a") ||
// buf_ends_with_str(link_lib->name, ".so"))
// {
// arg = link_lib->name;
// } else {
// arg = buf_sprintf("-l%s", buf_ptr(link_lib->name));
// }
// lj->args.append(buf_ptr(arg));
//}
// libc dep
if (ctx.comp.haveLibC()) {
if (ctx.comp.is_static) {
try ctx.args.append("--start-group");
try ctx.args.append("-lgcc");
try ctx.args.append("-lgcc_eh");
try ctx.args.append("-lc");
try ctx.args.append("-lm");
try ctx.args.append("--end-group");
} else {
try ctx.args.append("-lgcc");
try ctx.args.append("--as-needed");
try ctx.args.append("-lgcc_s");
try ctx.args.append("--no-as-needed");
try ctx.args.append("-lc");
try ctx.args.append("-lm");
try ctx.args.append("-lgcc");
try ctx.args.append("--as-needed");
try ctx.args.append("-lgcc_s");
try ctx.args.append("--no-as-needed");
}
}
// crt end
if (ctx.link_in_crt) {
try addPathJoin(ctx, ctx.libc.crt_dir.?, "crtn.o");
}
//if (ctx.comp.target != Target.Native) {
// try ctx.args.append("--allow-shlib-undefined");
//}
}
fn addPathJoin(ctx: *Context, dirname: []const u8, basename: []const u8) !void {
const full_path = try std.fs.path.join(&ctx.arena.allocator, &[_][]const u8{ dirname, basename });
const full_path_with_null = try std.cstr.addNullByte(&ctx.arena.allocator, full_path);
try ctx.args.append(@ptrCast([*:0]const u8, full_path_with_null.ptr));
}
fn constructLinkerArgsCoff(ctx: *Context) !void {
try ctx.args.append("-NOLOGO");
if (!ctx.comp.strip) {
try ctx.args.append("-DEBUG");
}
switch (ctx.comp.target.cpu.arch) {
.i386 => try ctx.args.append("-MACHINE:X86"),
.x86_64 => try ctx.args.append("-MACHINE:X64"),
.aarch64 => try ctx.args.append("-MACHINE:ARM"),
else => return error.UnsupportedLinkArchitecture,
}
const is_library = ctx.comp.kind == .Lib;
const out_arg = try std.fmt.allocPrint(&ctx.arena.allocator, "-OUT:{}\x00", .{ctx.out_file_path.span()});
try ctx.args.append(@ptrCast([*:0]const u8, out_arg.ptr));
if (ctx.comp.haveLibC()) {
try ctx.args.append(@ptrCast([*:0]const u8, (try std.fmt.allocPrint(&ctx.arena.allocator, "-LIBPATH:{}\x00", .{ctx.libc.msvc_lib_dir.?})).ptr));
try ctx.args.append(@ptrCast([*:0]const u8, (try std.fmt.allocPrint(&ctx.arena.allocator, "-LIBPATH:{}\x00", .{ctx.libc.kernel32_lib_dir.?})).ptr));
try ctx.args.append(@ptrCast([*:0]const u8, (try std.fmt.allocPrint(&ctx.arena.allocator, "-LIBPATH:{}\x00", .{ctx.libc.crt_dir.?})).ptr));
}
if (ctx.link_in_crt) {
const lib_str = if (ctx.comp.is_static) "lib" else "";
const d_str = if (ctx.comp.build_mode == .Debug) "d" else "";
if (ctx.comp.is_static) {
const cmt_lib_name = try std.fmt.allocPrint(&ctx.arena.allocator, "libcmt{}.lib\x00", .{d_str});
try ctx.args.append(@ptrCast([*:0]const u8, cmt_lib_name.ptr));
} else {
const msvcrt_lib_name = try std.fmt.allocPrint(&ctx.arena.allocator, "msvcrt{}.lib\x00", .{d_str});
try ctx.args.append(@ptrCast([*:0]const u8, msvcrt_lib_name.ptr));
}
const vcruntime_lib_name = try std.fmt.allocPrint(&ctx.arena.allocator, "{}vcruntime{}.lib\x00", .{
lib_str,
d_str,
});
try ctx.args.append(@ptrCast([*:0]const u8, vcruntime_lib_name.ptr));
const crt_lib_name = try std.fmt.allocPrint(&ctx.arena.allocator, "{}ucrt{}.lib\x00", .{ lib_str, d_str });
try ctx.args.append(@ptrCast([*:0]const u8, crt_lib_name.ptr));
// Visual C++ 2015 Conformance Changes
// https://msdn.microsoft.com/en-us/library/bb531344.aspx
try ctx.args.append("legacy_stdio_definitions.lib");
// msvcrt depends on kernel32
try ctx.args.append("kernel32.lib");
} else {
try ctx.args.append("-NODEFAULTLIB");
if (!is_library) {
try ctx.args.append("-ENTRY:WinMainCRTStartup");
}
}
if (is_library and !ctx.comp.is_static) {
try ctx.args.append("-DLL");
}
for (ctx.comp.link_objects) |link_object| {
const link_obj_with_null = try std.cstr.addNullByte(&ctx.arena.allocator, link_object);
try ctx.args.append(@ptrCast([*:0]const u8, link_obj_with_null.ptr));
}
try addFnObjects(ctx);
switch (ctx.comp.kind) {
.Exe, .Lib => {
if (!ctx.comp.haveLibC()) {
@panic("TODO");
}
},
.Obj => {},
}
}
fn constructLinkerArgsMachO(ctx: *Context) !void {
try ctx.args.append("-demangle");
if (ctx.comp.linker_rdynamic) {
try ctx.args.append("-export_dynamic");
}
const is_lib = ctx.comp.kind == .Lib;
const shared = !ctx.comp.is_static and is_lib;
if (ctx.comp.is_static) {
try ctx.args.append("-static");
} else {
try ctx.args.append("-dynamic");
}
try ctx.args.append("-arch");
try ctx.args.append(util.getDarwinArchString(ctx.comp.target));
const platform = try DarwinPlatform.get(ctx.comp);
switch (platform.kind) {
.MacOS => try ctx.args.append("-macosx_version_min"),
.IPhoneOS => try ctx.args.append("-iphoneos_version_min"),
.IPhoneOSSimulator => try ctx.args.append("-ios_simulator_version_min"),
}
const ver_str = try std.fmt.allocPrint(&ctx.arena.allocator, "{}.{}.{}\x00", .{
platform.major,
platform.minor,
platform.micro,
});
try ctx.args.append(@ptrCast([*:0]const u8, ver_str.ptr));
if (ctx.comp.kind == .Exe) {
if (ctx.comp.is_static) {
try ctx.args.append("-no_pie");
} else {
try ctx.args.append("-pie");
}
}
try ctx.args.append("-o");
try ctx.args.append(ctx.out_file_path.span());
if (shared) {
try ctx.args.append("-headerpad_max_install_names");
} else if (ctx.comp.is_static) {
try ctx.args.append("-lcrt0.o");
} else {
switch (platform.kind) {
.MacOS => {
if (platform.versionLessThan(10, 5)) {
try ctx.args.append("-lcrt1.o");
} else if (platform.versionLessThan(10, 6)) {
try ctx.args.append("-lcrt1.10.5.o");
} else if (platform.versionLessThan(10, 8)) {
try ctx.args.append("-lcrt1.10.6.o");
}
},
.IPhoneOS => {
if (ctx.comp.target.cpu.arch == .aarch64) {
// iOS does not need any crt1 files for arm64
} else if (platform.versionLessThan(3, 1)) {
try ctx.args.append("-lcrt1.o");
} else if (platform.versionLessThan(6, 0)) {
try ctx.args.append("-lcrt1.3.1.o");
}
},
.IPhoneOSSimulator => {}, // no crt1.o needed
}
}
for (ctx.comp.link_objects) |link_object| {
const link_obj_with_null = try std.cstr.addNullByte(&ctx.arena.allocator, link_object);
try ctx.args.append(@ptrCast([*:0]const u8, link_obj_with_null.ptr));
}
try addFnObjects(ctx);
// TODO
//if (ctx.comp.target == Target.Native) {
// for (ctx.comp.link_libs_list.span()) |lib| {
// if (mem.eql(u8, lib.name, "c")) {
// // on Darwin, libSystem has libc in it, but also you have to use it
// // to make syscalls because the syscall numbers are not documented
// // and change between versions.
// // so we always link against libSystem
// try ctx.args.append("-lSystem");
// } else {
// if (mem.indexOfScalar(u8, lib.name, '/') == null) {
// const arg = try std.fmt.allocPrint(&ctx.arena.allocator, "-l{}\x00", .{lib.name});
// try ctx.args.append(@ptrCast([*:0]const u8, arg.ptr));
// } else {
// const arg = try std.cstr.addNullByte(&ctx.arena.allocator, lib.name);
// try ctx.args.append(@ptrCast([*:0]const u8, arg.ptr));
// }
// }
// }
//} else {
// try ctx.args.append("-undefined");
// try ctx.args.append("dynamic_lookup");
//}
if (platform.kind == .MacOS) {
if (platform.versionLessThan(10, 5)) {
try ctx.args.append("-lgcc_s.10.4");
} else if (platform.versionLessThan(10, 6)) {
try ctx.args.append("-lgcc_s.10.5");
}
} else {
@panic("TODO");
}
}
fn constructLinkerArgsWasm(ctx: *Context) void {
@panic("TODO");
}
fn addFnObjects(ctx: *Context) !void {
const held = ctx.comp.fn_link_set.acquire();
defer held.release();
var it = held.value.first;
while (it) |node| {
const fn_val = node.data orelse {
// handle the tombstone. See Value.Fn.destroy.
it = node.next;
held.value.remove(node);
ctx.comp.gpa().destroy(node);
continue;
};
try ctx.args.append(fn_val.containing_object.span());
it = node.next;
}
}
const DarwinPlatform = struct {
kind: Kind,
major: u32,
minor: u32,
micro: u32,
const Kind = enum {
MacOS,
IPhoneOS,
IPhoneOSSimulator,
};
fn get(comp: *Compilation) !DarwinPlatform {
var result: DarwinPlatform = undefined;
const ver_str = switch (comp.darwin_version_min) {
.MacOS => |ver| blk: {
result.kind = .MacOS;
break :blk ver;
},
.Ios => |ver| blk: {
result.kind = .IPhoneOS;
break :blk ver;
},
.None => blk: {
assert(comp.target.os.tag == .macosx);
result.kind = .MacOS;
break :blk "10.14";
},
};
var had_extra: bool = undefined;
try darwinGetReleaseVersion(
ver_str,
&result.major,
&result.minor,
&result.micro,
&had_extra,
);
if (had_extra or result.major != 10 or result.minor >= 100 or result.micro >= 100) {
return error.InvalidDarwinVersionString;
}
if (result.kind == .IPhoneOS) {
switch (comp.target.cpu.arch) {
.i386,
.x86_64,
=> result.kind = .IPhoneOSSimulator,
else => {},
}
}
return result;
}
fn versionLessThan(self: DarwinPlatform, major: u32, minor: u32) bool {
if (self.major < major)
return true;
if (self.major > major)
return false;
if (self.minor < minor)
return true;
return false;
allocator.free(self.errors);
self.* = undefined;
}
};
/// Parse (([0-9]+)(.([0-9]+)(.([0-9]+)?))?)? and return the
/// grouped values as integers. Numbers which are not provided are set to 0.
/// return true if the entire string was parsed (9.2), or all groups were
/// parsed (10.3.5extrastuff).
fn darwinGetReleaseVersion(str: []const u8, major: *u32, minor: *u32, micro: *u32, had_extra: *bool) !void {
major.* = 0;
minor.* = 0;
micro.* = 0;
had_extra.* = false;
/// Attempts incremental linking, if the file already exists.
/// If incremental linking fails, falls back to truncating the file and rewriting it.
/// A malicious file is detected as incremental link failure and does not cause Illegal Behavior.
/// This operation is not atomic.
pub fn updateExecutableFilePath(
allocator: *Allocator,
module: ir.Module,
dir: fs.Dir,
sub_path: []const u8,
) !Result {
const file = try dir.createFile(sub_path, .{ .truncate = false, .read = true, .mode = executable_mode });
defer file.close();
if (str.len == 0)
return error.InvalidDarwinVersionString;
var start_pos: usize = 0;
for ([_]*u32{ major, minor, micro }) |v| {
const dot_pos = mem.indexOfScalarPos(u8, str, start_pos, '.');
const end_pos = dot_pos orelse str.len;
v.* = std.fmt.parseUnsigned(u32, str[start_pos..end_pos], 10) catch return error.InvalidDarwinVersionString;
start_pos = (dot_pos orelse return) + 1;
if (start_pos == str.len) return;
}
had_extra.* = true;
return updateExecutableFile(allocator, module, file);
}
/// Atomically overwrites the old file, if present.
pub fn writeExecutableFilePath(
allocator: *Allocator,
module: ir.Module,
dir: fs.Dir,
sub_path: []const u8,
) !Result {
const af = try dir.atomicFile(sub_path, .{ .mode = executable_mode });
defer af.deinit();
const result = try writeExecutableFile(allocator, module, af.file);
try af.finish();
return result;
}
/// Attempts incremental linking, if the file already exists.
/// If incremental linking fails, falls back to truncating the file and rewriting it.
/// Returns an error if `file` is not already open with +read +write +seek abilities.
/// A malicious file is detected as incremental link failure and does not cause Illegal Behavior.
/// This operation is not atomic.
pub fn updateExecutableFile(allocator: *Allocator, module: ir.Module, file: fs.File) !Result {
return updateExecutableFileInner(allocator, module, file) catch |err| switch (err) {
error.IncrFailed => {
return writeExecutableFile(allocator, module, file);
},
else => |e| return e,
};
}
const Update = struct {
file: fs.File,
module: *const ir.Module,
/// Stored in native-endian format, depending on target endianness needs to be bswapped on read/write.
/// Same order as in the file.
sections: std.ArrayList(elf.Elf64_Shdr),
shdr_table_offset: ?u64,
/// Stored in native-endian format, depending on target endianness needs to be bswapped on read/write.
/// Same order as in the file.
program_headers: std.ArrayList(elf.Elf64_Phdr),
phdr_table_offset: ?u64,
/// The index into the program headers of a PT_LOAD program header with Read and Execute flags
phdr_load_re_index: ?u16,
entry_addr: ?u64,
shstrtab: std.ArrayList(u8),
shstrtab_index: ?u16,
text_section_index: ?u16,
symtab_section_index: ?u16,
/// The same order as in the file
symbols: std.ArrayList(elf.Elf64_Sym),
errors: std.ArrayList(ErrorMsg),
fn deinit(self: *Update) void {
self.sections.deinit();
self.program_headers.deinit();
self.shstrtab.deinit();
self.symbols.deinit();
self.errors.deinit();
}
// `expand_num / expand_den` is the factor of padding when allocation
const alloc_num = 4;
const alloc_den = 3;
/// Returns end pos of collision, if any.
fn detectAllocCollision(self: *Update, start: u64, size: u64) ?u64 {
const small_ptr = self.module.target.cpu.arch.ptrBitWidth() == 32;
const ehdr_size: u64 = if (small_ptr) @sizeOf(elf.Elf32_Ehdr) else @sizeOf(elf.Elf64_Ehdr);
if (start < ehdr_size)
return ehdr_size;
const end = start + satMul(size, alloc_num) / alloc_den;
if (self.shdr_table_offset) |off| {
const shdr_size: u64 = if (small_ptr) @sizeOf(elf.Elf32_Shdr) else @sizeOf(elf.Elf64_Shdr);
const tight_size = self.sections.items.len * shdr_size;
const increased_size = satMul(tight_size, alloc_num) / alloc_den;
const test_end = off + increased_size;
if (end > off and start < test_end) {
return test_end;
}
}
if (self.phdr_table_offset) |off| {
const phdr_size: u64 = if (small_ptr) @sizeOf(elf.Elf32_Phdr) else @sizeOf(elf.Elf64_Phdr);
const tight_size = self.sections.items.len * phdr_size;
const increased_size = satMul(tight_size, alloc_num) / alloc_den;
const test_end = off + increased_size;
if (end > off and start < test_end) {
return test_end;
}
}
for (self.sections.items) |section| {
const increased_size = satMul(section.sh_size, alloc_num) / alloc_den;
const test_end = section.sh_offset + increased_size;
if (end > section.sh_offset and start < test_end) {
return test_end;
}
}
for (self.program_headers.items) |program_header| {
const increased_size = satMul(program_header.p_filesz, alloc_num) / alloc_den;
const test_end = program_header.p_offset + increased_size;
if (end > program_header.p_offset and start < test_end) {
return test_end;
}
}
return null;
}
fn allocatedSize(self: *Update, start: u64) u64 {
var min_pos: u64 = std.math.maxInt(u64);
if (self.shdr_table_offset) |off| {
if (off > start and off < min_pos) min_pos = off;
}
if (self.phdr_table_offset) |off| {
if (off > start and off < min_pos) min_pos = off;
}
for (self.sections.items) |section| {
if (section.sh_offset <= start) continue;
if (section.sh_offset < min_pos) min_pos = section.sh_offset;
}
for (self.program_headers.items) |program_header| {
if (program_header.p_offset <= start) continue;
if (program_header.p_offset < min_pos) min_pos = program_header.p_offset;
}
return min_pos - start;
}
fn findFreeSpace(self: *Update, object_size: u64, min_alignment: u16) u64 {
var start: u64 = 0;
while (self.detectAllocCollision(start, object_size)) |item_end| {
start = mem.alignForwardGeneric(u64, item_end, min_alignment);
}
return start;
}
fn makeString(self: *Update, bytes: []const u8) !u32 {
const result = self.shstrtab.items.len;
try self.shstrtab.appendSlice(bytes);
try self.shstrtab.append(0);
return @intCast(u32, result);
}
fn perform(self: *Update) !void {
const ptr_width: enum { p32, p64 } = switch (self.module.target.cpu.arch.ptrBitWidth()) {
32 => .p32,
64 => .p64,
else => return error.UnsupportedArchitecture,
};
const small_ptr = switch (ptr_width) {
.p32 => true,
.p64 => false,
};
// This means the entire read-only executable program code needs to be rewritten.
var phdr_load_re_dirty = false;
var phdr_table_dirty = false;
var shdr_table_dirty = false;
var shstrtab_dirty = false;
var symtab_dirty = false;
if (self.phdr_load_re_index == null) {
self.phdr_load_re_index = @intCast(u16, self.program_headers.items.len);
const file_size = 256 * 1024;
const p_align = 0x1000;
const off = self.findFreeSpace(file_size, p_align);
//std.debug.warn("found PT_LOAD free space 0x{x} to 0x{x}\n", .{ off, off + file_size });
try self.program_headers.append(.{
.p_type = elf.PT_LOAD,
.p_offset = off,
.p_filesz = file_size,
.p_vaddr = default_entry_addr,
.p_paddr = default_entry_addr,
.p_memsz = 0,
.p_align = p_align,
.p_flags = elf.PF_X | elf.PF_R,
});
self.entry_addr = null;
phdr_load_re_dirty = true;
phdr_table_dirty = true;
}
if (self.sections.items.len == 0) {
// There must always be a null section in index 0
try self.sections.append(.{
.sh_name = 0,
.sh_type = elf.SHT_NULL,
.sh_flags = 0,
.sh_addr = 0,
.sh_offset = 0,
.sh_size = 0,
.sh_link = 0,
.sh_info = 0,
.sh_addralign = 0,
.sh_entsize = 0,
});
shdr_table_dirty = true;
}
if (self.shstrtab_index == null) {
self.shstrtab_index = @intCast(u16, self.sections.items.len);
assert(self.shstrtab.items.len == 0);
try self.shstrtab.append(0); // need a 0 at position 0
const off = self.findFreeSpace(self.shstrtab.items.len, 1);
//std.debug.warn("found shstrtab free space 0x{x} to 0x{x}\n", .{ off, off + self.shstrtab.items.len });
try self.sections.append(.{
.sh_name = try self.makeString(".shstrtab"),
.sh_type = elf.SHT_STRTAB,
.sh_flags = 0,
.sh_addr = 0,
.sh_offset = off,
.sh_size = self.shstrtab.items.len,
.sh_link = 0,
.sh_info = 0,
.sh_addralign = 1,
.sh_entsize = 0,
});
shstrtab_dirty = true;
shdr_table_dirty = true;
}
if (self.text_section_index == null) {
self.text_section_index = @intCast(u16, self.sections.items.len);
const phdr = &self.program_headers.items[self.phdr_load_re_index.?];
try self.sections.append(.{
.sh_name = try self.makeString(".text"),
.sh_type = elf.SHT_PROGBITS,
.sh_flags = elf.SHF_ALLOC | elf.SHF_EXECINSTR,
.sh_addr = phdr.p_vaddr,
.sh_offset = phdr.p_offset,
.sh_size = phdr.p_filesz,
.sh_link = 0,
.sh_info = 0,
.sh_addralign = phdr.p_align,
.sh_entsize = 0,
});
shdr_table_dirty = true;
}
if (self.symtab_section_index == null) {
self.symtab_section_index = @intCast(u16, self.sections.items.len);
const min_align: u16 = if (small_ptr) @alignOf(elf.Elf32_Sym) else @alignOf(elf.Elf64_Sym);
const each_size: u64 = if (small_ptr) @sizeOf(elf.Elf32_Sym) else @sizeOf(elf.Elf64_Sym);
const file_size = self.module.exports.len * each_size;
const off = self.findFreeSpace(file_size, min_align);
//std.debug.warn("found symtab free space 0x{x} to 0x{x}\n", .{ off, off + file_size });
try self.sections.append(.{
.sh_name = try self.makeString(".symtab"),
.sh_type = elf.SHT_SYMTAB,
.sh_flags = 0,
.sh_addr = 0,
.sh_offset = off,
.sh_size = file_size,
// The section header index of the associated string table.
.sh_link = self.shstrtab_index.?,
.sh_info = @intCast(u32, self.module.exports.len),
.sh_addralign = min_align,
.sh_entsize = each_size,
});
symtab_dirty = true;
shdr_table_dirty = true;
}
const shsize: u64 = switch (ptr_width) {
.p32 => @sizeOf(elf.Elf32_Shdr),
.p64 => @sizeOf(elf.Elf64_Shdr),
};
const shalign: u16 = switch (ptr_width) {
.p32 => @alignOf(elf.Elf32_Shdr),
.p64 => @alignOf(elf.Elf64_Shdr),
};
if (self.shdr_table_offset == null) {
self.shdr_table_offset = self.findFreeSpace(self.sections.items.len * shsize, shalign);
shdr_table_dirty = true;
}
const phsize: u64 = switch (ptr_width) {
.p32 => @sizeOf(elf.Elf32_Phdr),
.p64 => @sizeOf(elf.Elf64_Phdr),
};
const phalign: u16 = switch (ptr_width) {
.p32 => @alignOf(elf.Elf32_Phdr),
.p64 => @alignOf(elf.Elf64_Phdr),
};
if (self.phdr_table_offset == null) {
self.phdr_table_offset = self.findFreeSpace(self.program_headers.items.len * phsize, phalign);
phdr_table_dirty = true;
}
const foreign_endian = self.module.target.cpu.arch.endian() != std.Target.current.cpu.arch.endian();
try self.writeCodeAndSymbols(phdr_table_dirty, shdr_table_dirty);
if (phdr_table_dirty) {
const allocated_size = self.allocatedSize(self.phdr_table_offset.?);
const needed_size = self.program_headers.items.len * phsize;
if (needed_size > allocated_size) {
self.phdr_table_offset = null; // free the space
self.phdr_table_offset = self.findFreeSpace(needed_size, phalign);
}
const allocator = self.program_headers.allocator;
switch (ptr_width) {
.p32 => {
const buf = try allocator.alloc(elf.Elf32_Phdr, self.program_headers.items.len);
defer allocator.free(buf);
for (buf) |*phdr, i| {
phdr.* = progHeaderTo32(self.program_headers.items[i]);
if (foreign_endian) {
bswapAllFields(elf.Elf32_Phdr, phdr);
}
}
try self.file.pwriteAll(mem.sliceAsBytes(buf), self.phdr_table_offset.?);
},
.p64 => {
const buf = try allocator.alloc(elf.Elf64_Phdr, self.program_headers.items.len);
defer allocator.free(buf);
for (buf) |*phdr, i| {
phdr.* = self.program_headers.items[i];
if (foreign_endian) {
bswapAllFields(elf.Elf64_Phdr, phdr);
}
}
try self.file.pwriteAll(mem.sliceAsBytes(buf), self.phdr_table_offset.?);
},
}
}
{
const shstrtab_sect = &self.sections.items[self.shstrtab_index.?];
if (shstrtab_dirty or self.shstrtab.items.len != shstrtab_sect.sh_size) {
const allocated_size = self.allocatedSize(shstrtab_sect.sh_offset);
const needed_size = self.shstrtab.items.len;
if (needed_size > allocated_size) {
shstrtab_sect.sh_size = 0; // free the space
shstrtab_sect.sh_offset = self.findFreeSpace(needed_size, 1);
}
shstrtab_sect.sh_size = needed_size;
//std.debug.warn("shstrtab start=0x{x} end=0x{x}\n", .{ shstrtab_sect.sh_offset, shstrtab_sect.sh_offset + needed_size });
try self.file.pwriteAll(self.shstrtab.items, shstrtab_sect.sh_offset);
if (!shdr_table_dirty) {
// Then it won't get written with the others and we need to do it.
try self.writeSectHeader(self.shstrtab_index.?);
}
}
}
if (shdr_table_dirty) {
const allocated_size = self.allocatedSize(self.shdr_table_offset.?);
const needed_size = self.sections.items.len * phsize;
if (needed_size > allocated_size) {
self.shdr_table_offset = null; // free the space
self.shdr_table_offset = self.findFreeSpace(needed_size, phalign);
}
const allocator = self.sections.allocator;
switch (ptr_width) {
.p32 => {
const buf = try allocator.alloc(elf.Elf32_Shdr, self.sections.items.len);
defer allocator.free(buf);
for (buf) |*shdr, i| {
shdr.* = sectHeaderTo32(self.sections.items[i]);
if (foreign_endian) {
bswapAllFields(elf.Elf32_Shdr, shdr);
}
}
try self.file.pwriteAll(mem.sliceAsBytes(buf), self.shdr_table_offset.?);
},
.p64 => {
const buf = try allocator.alloc(elf.Elf64_Shdr, self.sections.items.len);
defer allocator.free(buf);
for (buf) |*shdr, i| {
shdr.* = self.sections.items[i];
//std.debug.warn("writing section {}\n", .{shdr.*});
if (foreign_endian) {
bswapAllFields(elf.Elf64_Shdr, shdr);
}
}
try self.file.pwriteAll(mem.sliceAsBytes(buf), self.shdr_table_offset.?);
},
}
}
if (self.entry_addr == null) {
const msg = try std.fmt.allocPrint(self.errors.allocator, "no entry point found", .{});
errdefer self.errors.allocator.free(msg);
try self.errors.append(.{
.byte_offset = 0,
.msg = msg,
});
} else {
try self.writeElfHeader();
}
// TODO find end pos and truncate
}
fn writeElfHeader(self: *Update) !void {
var hdr_buf: [@sizeOf(elf.Elf64_Ehdr)]u8 = undefined;
var index: usize = 0;
hdr_buf[0..4].* = "\x7fELF".*;
index += 4;
const ptr_width: enum { p32, p64 } = switch (self.module.target.cpu.arch.ptrBitWidth()) {
32 => .p32,
64 => .p64,
else => return error.UnsupportedArchitecture,
};
hdr_buf[index] = switch (ptr_width) {
.p32 => elf.ELFCLASS32,
.p64 => elf.ELFCLASS64,
};
index += 1;
const endian = self.module.target.cpu.arch.endian();
hdr_buf[index] = switch (endian) {
.Little => elf.ELFDATA2LSB,
.Big => elf.ELFDATA2MSB,
};
index += 1;
hdr_buf[index] = 1; // ELF version
index += 1;
// OS ABI, often set to 0 regardless of target platform
// ABI Version, possibly used by glibc but not by static executables
// padding
mem.set(u8, hdr_buf[index..][0..9], 0);
index += 9;
assert(index == 16);
mem.writeInt(u16, hdr_buf[index..][0..2], @enumToInt(elf.ET.EXEC), endian);
index += 2;
const machine = self.module.target.cpu.arch.toElfMachine();
mem.writeInt(u16, hdr_buf[index..][0..2], @enumToInt(machine), endian);
index += 2;
// ELF Version, again
mem.writeInt(u32, hdr_buf[index..][0..4], 1, endian);
index += 4;
switch (ptr_width) {
.p32 => {
// e_entry
mem.writeInt(u32, hdr_buf[index..][0..4], @intCast(u32, self.entry_addr.?), endian);
index += 4;
// e_phoff
mem.writeInt(u32, hdr_buf[index..][0..4], @intCast(u32, self.phdr_table_offset.?), endian);
index += 4;
// e_shoff
mem.writeInt(u32, hdr_buf[index..][0..4], @intCast(u32, self.shdr_table_offset.?), endian);
index += 4;
},
.p64 => {
// e_entry
mem.writeInt(u64, hdr_buf[index..][0..8], self.entry_addr.?, endian);
index += 8;
// e_phoff
mem.writeInt(u64, hdr_buf[index..][0..8], self.phdr_table_offset.?, endian);
index += 8;
// e_shoff
mem.writeInt(u64, hdr_buf[index..][0..8], self.shdr_table_offset.?, endian);
index += 8;
},
}
const e_flags = 0;
mem.writeInt(u32, hdr_buf[index..][0..4], e_flags, endian);
index += 4;
const e_ehsize: u16 = switch (ptr_width) {
.p32 => @sizeOf(elf.Elf32_Ehdr),
.p64 => @sizeOf(elf.Elf64_Ehdr),
};
mem.writeInt(u16, hdr_buf[index..][0..2], e_ehsize, endian);
index += 2;
const e_phentsize: u16 = switch (ptr_width) {
.p32 => @sizeOf(elf.Elf32_Phdr),
.p64 => @sizeOf(elf.Elf64_Phdr),
};
mem.writeInt(u16, hdr_buf[index..][0..2], e_phentsize, endian);
index += 2;
const e_phnum = @intCast(u16, self.program_headers.items.len);
mem.writeInt(u16, hdr_buf[index..][0..2], e_phnum, endian);
index += 2;
const e_shentsize: u16 = switch (ptr_width) {
.p32 => @sizeOf(elf.Elf32_Shdr),
.p64 => @sizeOf(elf.Elf64_Shdr),
};
mem.writeInt(u16, hdr_buf[index..][0..2], e_shentsize, endian);
index += 2;
const e_shnum = @intCast(u16, self.sections.items.len);
mem.writeInt(u16, hdr_buf[index..][0..2], e_shnum, endian);
index += 2;
mem.writeInt(u16, hdr_buf[index..][0..2], self.shstrtab_index.?, endian);
index += 2;
assert(index == e_ehsize);
try self.file.pwriteAll(hdr_buf[0..index], 0);
}
fn writeCodeAndSymbols(self: *Update, phdr_table_dirty: bool, shdr_table_dirty: bool) !void {
// index 0 is always a null symbol
try self.symbols.resize(1);
self.symbols.items[0] = .{
.st_name = 0,
.st_info = 0,
.st_other = 0,
.st_shndx = 0,
.st_value = 0,
.st_size = 0,
};
const phdr = &self.program_headers.items[self.phdr_load_re_index.?];
var vaddr: u64 = phdr.p_vaddr;
var file_off: u64 = phdr.p_offset;
var code = std.ArrayList(u8).init(self.sections.allocator);
defer code.deinit();
for (self.module.exports) |exp| {
code.shrink(0);
var symbol = try codegen.generateSymbol(exp.typed_value, self.module.*, &code);
defer symbol.deinit(code.allocator);
if (symbol.errors.len != 0) {
for (symbol.errors) |err| {
const msg = try mem.dupe(self.errors.allocator, u8, err.msg);
errdefer self.errors.allocator.free(msg);
try self.errors.append(.{
.byte_offset = err.byte_offset,
.msg = msg,
});
}
continue;
}
try self.file.pwriteAll(code.items, file_off);
if (mem.eql(u8, exp.name, "_start")) {
self.entry_addr = vaddr;
}
(try self.symbols.addOne()).* = .{
.st_name = try self.makeString(exp.name),
.st_info = (elf.STB_LOCAL << 4) | elf.STT_FUNC,
.st_other = 0,
.st_shndx = self.text_section_index.?,
.st_value = vaddr,
.st_size = code.items.len,
};
vaddr += code.items.len;
}
{
// Now that we know the code size, we need to update the program header for executable code
phdr.p_memsz = vaddr - phdr.p_vaddr;
phdr.p_filesz = phdr.p_memsz;
const shdr = &self.sections.items[self.text_section_index.?];
shdr.sh_size = phdr.p_filesz;
if (!phdr_table_dirty) {
// Then it won't get written with the others and we need to do it.
try self.writeProgHeader(self.phdr_load_re_index.?);
}
if (!shdr_table_dirty) {
// Then it won't get written with the others and we need to do it.
try self.writeSectHeader(self.text_section_index.?);
}
}
return self.writeSymbols();
}
fn writeProgHeader(self: *Update, index: usize) !void {
const foreign_endian = self.module.target.cpu.arch.endian() != std.Target.current.cpu.arch.endian();
const offset = self.program_headers.items[index].p_offset;
switch (self.module.target.cpu.arch.ptrBitWidth()) {
32 => {
var phdr = [1]elf.Elf32_Phdr{progHeaderTo32(self.program_headers.items[index])};
if (foreign_endian) {
bswapAllFields(elf.Elf32_Phdr, &phdr[0]);
}
return self.file.pwriteAll(mem.sliceAsBytes(&phdr), offset);
},
64 => {
var phdr = [1]elf.Elf64_Phdr{self.program_headers.items[index]};
if (foreign_endian) {
bswapAllFields(elf.Elf64_Phdr, &phdr[0]);
}
return self.file.pwriteAll(mem.sliceAsBytes(&phdr), offset);
},
else => return error.UnsupportedArchitecture,
}
}
fn writeSectHeader(self: *Update, index: usize) !void {
const foreign_endian = self.module.target.cpu.arch.endian() != std.Target.current.cpu.arch.endian();
const offset = self.sections.items[index].sh_offset;
switch (self.module.target.cpu.arch.ptrBitWidth()) {
32 => {
var shdr: [1]elf.Elf32_Shdr = undefined;
shdr[0] = sectHeaderTo32(self.sections.items[index]);
if (foreign_endian) {
bswapAllFields(elf.Elf32_Shdr, &shdr[0]);
}
return self.file.pwriteAll(mem.sliceAsBytes(&shdr), offset);
},
64 => {
var shdr = [1]elf.Elf64_Shdr{self.sections.items[index]};
if (foreign_endian) {
bswapAllFields(elf.Elf64_Shdr, &shdr[0]);
}
return self.file.pwriteAll(mem.sliceAsBytes(&shdr), offset);
},
else => return error.UnsupportedArchitecture,
}
}
fn writeSymbols(self: *Update) !void {
const ptr_width: enum { p32, p64 } = switch (self.module.target.cpu.arch.ptrBitWidth()) {
32 => .p32,
64 => .p64,
else => return error.UnsupportedArchitecture,
};
const small_ptr = ptr_width == .p32;
const syms_sect = &self.sections.items[self.symtab_section_index.?];
const sym_align: u16 = if (small_ptr) @alignOf(elf.Elf32_Sym) else @alignOf(elf.Elf64_Sym);
const sym_size: u64 = if (small_ptr) @sizeOf(elf.Elf32_Sym) else @sizeOf(elf.Elf64_Sym);
const allocated_size = self.allocatedSize(syms_sect.sh_offset);
const needed_size = self.symbols.items.len * sym_size;
if (needed_size > allocated_size) {
syms_sect.sh_size = 0; // free the space
syms_sect.sh_offset = self.findFreeSpace(needed_size, sym_align);
//std.debug.warn("moved symtab to 0x{x} to 0x{x}\n", .{ syms_sect.sh_offset, syms_sect.sh_offset + needed_size });
}
//std.debug.warn("symtab start=0x{x} end=0x{x}\n", .{ syms_sect.sh_offset, syms_sect.sh_offset + needed_size });
syms_sect.sh_size = needed_size;
syms_sect.sh_info = @intCast(u32, self.symbols.items.len);
const allocator = self.symbols.allocator;
const foreign_endian = self.module.target.cpu.arch.endian() != std.Target.current.cpu.arch.endian();
switch (ptr_width) {
.p32 => {
const buf = try allocator.alloc(elf.Elf32_Sym, self.symbols.items.len);
defer allocator.free(buf);
for (buf) |*sym, i| {
sym.* = .{
.st_name = self.symbols.items[i].st_name,
.st_value = @intCast(u32, self.symbols.items[i].st_value),
.st_size = @intCast(u32, self.symbols.items[i].st_size),
.st_info = self.symbols.items[i].st_info,
.st_other = self.symbols.items[i].st_other,
.st_shndx = self.symbols.items[i].st_shndx,
};
if (foreign_endian) {
bswapAllFields(elf.Elf32_Sym, sym);
}
}
try self.file.pwriteAll(mem.sliceAsBytes(buf), syms_sect.sh_offset);
},
.p64 => {
const buf = try allocator.alloc(elf.Elf64_Sym, self.symbols.items.len);
defer allocator.free(buf);
for (buf) |*sym, i| {
sym.* = .{
.st_name = self.symbols.items[i].st_name,
.st_value = self.symbols.items[i].st_value,
.st_size = self.symbols.items[i].st_size,
.st_info = self.symbols.items[i].st_info,
.st_other = self.symbols.items[i].st_other,
.st_shndx = self.symbols.items[i].st_shndx,
};
if (foreign_endian) {
bswapAllFields(elf.Elf64_Sym, sym);
}
}
try self.file.pwriteAll(mem.sliceAsBytes(buf), syms_sect.sh_offset);
},
}
}
};
/// Truncates the existing file contents and overwrites the contents.
/// Returns an error if `file` is not already open with +read +write +seek abilities.
pub fn writeExecutableFile(allocator: *Allocator, module: ir.Module, file: fs.File) !Result {
var update = Update{
.file = file,
.module = &module,
.sections = std.ArrayList(elf.Elf64_Shdr).init(allocator),
.shdr_table_offset = null,
.program_headers = std.ArrayList(elf.Elf64_Phdr).init(allocator),
.phdr_table_offset = null,
.phdr_load_re_index = null,
.entry_addr = null,
.shstrtab = std.ArrayList(u8).init(allocator),
.shstrtab_index = null,
.text_section_index = null,
.symtab_section_index = null,
.symbols = std.ArrayList(elf.Elf64_Sym).init(allocator),
.errors = std.ArrayList(ErrorMsg).init(allocator),
};
defer update.deinit();
try update.perform();
return Result{
.errors = update.errors.toOwnedSlice(),
};
}
/// Returns error.IncrFailed if incremental update could not be performed.
fn updateExecutableFileInner(allocator: *Allocator, module: ir.Module, file: fs.File) !Result {
//var ehdr_buf: [@sizeOf(elf.Elf64_Ehdr)]u8 = undefined;
// TODO implement incremental linking
return error.IncrFailed;
}
/// Saturating multiplication
fn satMul(a: var, b: var) @TypeOf(a, b) {
const T = @TypeOf(a, b);
return std.math.mul(T, a, b) catch std.math.maxInt(T);
}
fn bswapAllFields(comptime S: type, ptr: *S) void {
@panic("TODO implement bswapAllFields");
}
fn progHeaderTo32(phdr: elf.Elf64_Phdr) elf.Elf32_Phdr {
return .{
.p_type = phdr.p_type,
.p_flags = phdr.p_flags,
.p_offset = @intCast(u32, phdr.p_offset),
.p_vaddr = @intCast(u32, phdr.p_vaddr),
.p_paddr = @intCast(u32, phdr.p_paddr),
.p_filesz = @intCast(u32, phdr.p_filesz),
.p_memsz = @intCast(u32, phdr.p_memsz),
.p_align = @intCast(u32, phdr.p_align),
};
}
fn sectHeaderTo32(shdr: elf.Elf64_Shdr) elf.Elf32_Shdr {
return .{
.sh_name = shdr.sh_name,
.sh_type = shdr.sh_type,
.sh_flags = @intCast(u32, shdr.sh_flags),
.sh_addr = @intCast(u32, shdr.sh_addr),
.sh_offset = @intCast(u32, shdr.sh_offset),
.sh_size = @intCast(u32, shdr.sh_size),
.sh_link = shdr.sh_link,
.sh_info = shdr.sh_info,
.sh_addralign = @intCast(u32, shdr.sh_addralign),
.sh_entsize = @intCast(u32, shdr.sh_entsize),
};
}
src-self-hosted/value.zig
+50
View File
@@ -264,6 +264,56 @@ pub const Value = extern union {
}
}
/// Asserts the value is an integer and it fits in a u64
pub fn toUnsignedInt(self: Value) u64 {
switch (self.tag()) {
.ty,
.u8_type,
.i8_type,
.isize_type,
.usize_type,
.c_short_type,
.c_ushort_type,
.c_int_type,
.c_uint_type,
.c_long_type,
.c_ulong_type,
.c_longlong_type,
.c_ulonglong_type,
.c_longdouble_type,
.f16_type,
.f32_type,
.f64_type,
.f128_type,
.c_void_type,
.bool_type,
.void_type,
.type_type,
.anyerror_type,
.comptime_int_type,
.comptime_float_type,
.noreturn_type,
.fn_naked_noreturn_no_args_type,
.single_const_pointer_to_comptime_int_type,
.const_slice_u8_type,
.void_value,
.noreturn_value,
.bool_true,
.bool_false,
.function,
.ref,
.ref_val,
.bytes,
=> unreachable,
.zero => return 0,
.int_u64 => return self.cast(Payload.Int_u64).?.int,
.int_i64 => return @intCast(u64, self.cast(Payload.Int_u64).?.int),
.int_big => return self.cast(Payload.IntBig).?.big_int.to(u64) catch unreachable,
}
}
/// Asserts the value is an integer, and the destination type is ComptimeInt or Int.
pub fn intFitsInType(self: Value, ty: Type, target: Target) bool {
switch (self.tag()) {