216 lines
7.9 KiB
Zig
216 lines
7.9 KiB
Zig
const std = @import("std");
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const Compilation = @import("compilation.zig").Compilation;
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// we go through llvm instead of c for 2 reasons:
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// 1. to avoid accidentally calling the non-thread-safe functions
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// 2. patch up some of the types to remove nullability
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const llvm = @import("llvm.zig");
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const ir = @import("ir.zig");
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const Value = @import("value.zig").Value;
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const Type = @import("type.zig").Type;
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const event = std.event;
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const assert = std.debug.assert;
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pub async fn renderToLlvm(comp: *Compilation, fn_val: *Value.Fn, code: *ir.Code) !void {
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fn_val.base.ref();
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defer fn_val.base.deref(comp);
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defer code.destroy(comp.a());
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const llvm_handle = try comp.event_loop_local.getAnyLlvmContext();
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defer llvm_handle.release(comp.event_loop_local);
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const context = llvm_handle.node.data;
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const module = llvm.ModuleCreateWithNameInContext(comp.name.ptr(), context) orelse return error.OutOfMemory;
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defer llvm.DisposeModule(module);
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const builder = llvm.CreateBuilderInContext(context) orelse return error.OutOfMemory;
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defer llvm.DisposeBuilder(builder);
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var ofile = ObjectFile{
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.comp = comp,
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.module = module,
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.builder = builder,
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.context = context,
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.lock = event.Lock.init(comp.loop),
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};
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try renderToLlvmModule(&ofile, fn_val, code);
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// TODO module level assembly
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//if (buf_len(&g->global_asm) != 0) {
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// LLVMSetModuleInlineAsm(g->module, buf_ptr(&g->global_asm));
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//}
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// TODO
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//ZigLLVMDIBuilderFinalize(g->dbuilder);
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if (comp.verbose_llvm_ir) {
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llvm.DumpModule(ofile.module);
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}
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// verify the llvm module when safety is on
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if (std.debug.runtime_safety) {
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var error_ptr: ?[*]u8 = null;
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_ = llvm.VerifyModule(ofile.module, llvm.AbortProcessAction, &error_ptr);
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}
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}
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pub const ObjectFile = struct {
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comp: *Compilation,
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module: llvm.ModuleRef,
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builder: llvm.BuilderRef,
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context: llvm.ContextRef,
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lock: event.Lock,
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fn a(self: *ObjectFile) *std.mem.Allocator {
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return self.comp.a();
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}
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};
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pub fn renderToLlvmModule(ofile: *ObjectFile, fn_val: *Value.Fn, code: *ir.Code) !void {
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// TODO audit more of codegen.cpp:fn_llvm_value and port more logic
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const llvm_fn_type = try fn_val.base.typeof.getLlvmType(ofile);
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const llvm_fn = llvm.AddFunction(
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ofile.module,
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fn_val.symbol_name.ptr(),
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llvm_fn_type,
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) orelse return error.OutOfMemory;
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const want_fn_safety = fn_val.block_scope.safety.get(ofile.comp);
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if (want_fn_safety and ofile.comp.haveLibC()) {
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try addLLVMFnAttr(ofile, llvm_fn, "sspstrong");
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try addLLVMFnAttrStr(ofile, llvm_fn, "stack-protector-buffer-size", "4");
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}
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// TODO
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//if (fn_val.align_stack) |align_stack| {
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// try addLLVMFnAttrInt(ofile, llvm_fn, "alignstack", align_stack);
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//}
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const fn_type = fn_val.base.typeof.cast(Type.Fn).?;
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try addLLVMFnAttr(ofile, llvm_fn, "nounwind");
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//add_uwtable_attr(g, fn_table_entry->llvm_value);
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try addLLVMFnAttr(ofile, llvm_fn, "nobuiltin");
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//if (g->build_mode == BuildModeDebug && fn_table_entry->fn_inline != FnInlineAlways) {
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// ZigLLVMAddFunctionAttr(fn_table_entry->llvm_value, "no-frame-pointer-elim", "true");
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// ZigLLVMAddFunctionAttr(fn_table_entry->llvm_value, "no-frame-pointer-elim-non-leaf", nullptr);
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//}
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//if (fn_table_entry->section_name) {
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// LLVMSetSection(fn_table_entry->llvm_value, buf_ptr(fn_table_entry->section_name));
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//}
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//if (fn_table_entry->align_bytes > 0) {
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// LLVMSetAlignment(fn_table_entry->llvm_value, (unsigned)fn_table_entry->align_bytes);
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//} else {
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// // We'd like to set the best alignment for the function here, but on Darwin LLVM gives
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// // "Cannot getTypeInfo() on a type that is unsized!" assertion failure when calling
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// // any of the functions for getting alignment. Not specifying the alignment should
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// // use the ABI alignment, which is fine.
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//}
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//if (!type_has_bits(return_type)) {
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// // nothing to do
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//} else if (type_is_codegen_pointer(return_type)) {
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// addLLVMAttr(fn_table_entry->llvm_value, 0, "nonnull");
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//} else if (handle_is_ptr(return_type) &&
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// calling_convention_does_first_arg_return(fn_type->data.fn.fn_type_id.cc))
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//{
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// addLLVMArgAttr(fn_table_entry->llvm_value, 0, "sret");
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// addLLVMArgAttr(fn_table_entry->llvm_value, 0, "nonnull");
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//}
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// TODO set parameter attributes
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// TODO
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//uint32_t err_ret_trace_arg_index = get_err_ret_trace_arg_index(g, fn_table_entry);
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//if (err_ret_trace_arg_index != UINT32_MAX) {
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// addLLVMArgAttr(fn_table_entry->llvm_value, (unsigned)err_ret_trace_arg_index, "nonnull");
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//}
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const cur_ret_ptr = if (fn_type.return_type.handleIsPtr()) llvm.GetParam(llvm_fn, 0) else null;
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// build all basic blocks
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for (code.basic_block_list.toSlice()) |bb| {
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bb.llvm_block = llvm.AppendBasicBlockInContext(
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ofile.context,
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llvm_fn,
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bb.name_hint,
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) orelse return error.OutOfMemory;
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}
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const entry_bb = code.basic_block_list.at(0);
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llvm.PositionBuilderAtEnd(ofile.builder, entry_bb.llvm_block);
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llvm.ClearCurrentDebugLocation(ofile.builder);
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// TODO set up error return tracing
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// TODO allocate temporary stack values
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// TODO create debug variable declarations for variables and allocate all local variables
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// TODO finishing error return trace setup. we have to do this after all the allocas.
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// TODO create debug variable declarations for parameters
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for (code.basic_block_list.toSlice()) |current_block| {
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llvm.PositionBuilderAtEnd(ofile.builder, current_block.llvm_block);
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for (current_block.instruction_list.toSlice()) |instruction| {
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if (instruction.ref_count == 0 and !instruction.hasSideEffects()) continue;
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instruction.llvm_value = try instruction.render(ofile, fn_val);
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}
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current_block.llvm_exit_block = llvm.GetInsertBlock(ofile.builder);
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}
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}
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fn addLLVMAttr(
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ofile: *ObjectFile,
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val: llvm.ValueRef,
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attr_index: llvm.AttributeIndex,
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attr_name: []const u8,
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) !void {
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const kind_id = llvm.GetEnumAttributeKindForName(attr_name.ptr, attr_name.len);
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assert(kind_id != 0);
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const llvm_attr = llvm.CreateEnumAttribute(ofile.context, kind_id, 0) orelse return error.OutOfMemory;
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llvm.AddAttributeAtIndex(val, attr_index, llvm_attr);
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}
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fn addLLVMAttrStr(
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ofile: *ObjectFile,
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val: llvm.ValueRef,
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attr_index: llvm.AttributeIndex,
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attr_name: []const u8,
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attr_val: []const u8,
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) !void {
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const llvm_attr = llvm.CreateStringAttribute(
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ofile.context,
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attr_name.ptr,
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@intCast(c_uint, attr_name.len),
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attr_val.ptr,
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@intCast(c_uint, attr_val.len),
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) orelse return error.OutOfMemory;
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llvm.AddAttributeAtIndex(val, attr_index, llvm_attr);
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}
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fn addLLVMAttrInt(
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val: llvm.ValueRef,
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attr_index: llvm.AttributeIndex,
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attr_name: []const u8,
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attr_val: u64,
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) !void {
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const kind_id = llvm.GetEnumAttributeKindForName(attr_name.ptr, attr_name.len);
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assert(kind_id != 0);
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const llvm_attr = llvm.CreateEnumAttribute(ofile.context, kind_id, attr_val) orelse return error.OutOfMemory;
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llvm.AddAttributeAtIndex(val, attr_index, llvm_attr);
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}
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fn addLLVMFnAttr(ofile: *ObjectFile, fn_val: llvm.ValueRef, attr_name: []const u8) !void {
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return addLLVMAttr(ofile, fn_val, @maxValue(llvm.AttributeIndex), attr_name);
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}
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fn addLLVMFnAttrStr(ofile: *ObjectFile, fn_val: llvm.ValueRef, attr_name: []const u8, attr_val: []const u8) !void {
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return addLLVMAttrStr(ofile, fn_val, @maxValue(llvm.AttributeIndex), attr_name, attr_val);
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}
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fn addLLVMFnAttrInt(ofile: *ObjectFile, fn_val: llvm.ValueRef, attr_name: []const u8, attr_val: u64) !void {
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return addLLVMAttrInt(ofile, fn_val, @maxValue(llvm.AttributeIndex), attr_name, attr_val);
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}
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