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llvm: fix bug lowering aggregate_init with a byref sentinel

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Closes #12972
This commit is contained in:
Jacob Young
2022-10-03 20:14:24 -04:00
committed by Andrew Kelley
parent ae39e7867d
commit 400319872b
3 changed files with 33 additions and 13 deletions
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28
src/codegen/llvm.zig
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@@ -4355,13 +4355,17 @@ pub const FuncGen = struct {
const gop = try self.func_inst_table.getOrPut(self.dg.gpa, inst);
if (gop.found_existing) return gop.value_ptr.*;
const val = self.air.value(inst).?;
const ty = self.air.typeOf(inst);
const llvm_val = try self.dg.lowerValue(.{ .ty = ty, .val = val });
if (!isByRef(ty)) {
gop.value_ptr.* = llvm_val;
return llvm_val;
}
const llvm_val = try self.resolveValue(.{
.ty = self.air.typeOf(inst),
.val = self.air.value(inst).?,
});
gop.value_ptr.* = llvm_val;
return llvm_val;
}
fn resolveValue(self: *FuncGen, tv: TypedValue) !*llvm.Value {
const llvm_val = try self.dg.lowerValue(tv);
if (!isByRef(tv.ty)) return llvm_val;
// We have an LLVM value but we need to create a global constant and
// set the value as its initializer, and then return a pointer to the global.
@@ -4371,15 +4375,13 @@ pub const FuncGen = struct {
global.setLinkage(.Private);
global.setGlobalConstant(.True);
global.setUnnamedAddr(.True);
global.setAlignment(ty.abiAlignment(target));
global.setAlignment(tv.ty.abiAlignment(target));
// Because of LLVM limitations for lowering certain types such as unions,
// the type of global constants might not match the type it is supposed to
// be, and so we must bitcast the pointer at the usage sites.
const wanted_llvm_ty = try self.dg.lowerType(ty);
const wanted_llvm_ty = try self.dg.lowerType(tv.ty);
const wanted_llvm_ptr_ty = wanted_llvm_ty.pointerType(0);
const casted_ptr = global.constBitCast(wanted_llvm_ptr_ty);
gop.value_ptr.* = casted_ptr;
return casted_ptr;
return global.constBitCast(wanted_llvm_ptr_ty);
}
fn genBody(self: *FuncGen, body: []const Air.Inst.Index) Error!void {
@@ -9032,7 +9034,7 @@ pub const FuncGen = struct {
llvm_usize.constInt(@intCast(c_uint, array_info.len), .False),
};
const elem_ptr = self.builder.buildInBoundsGEP(llvm_result_ty, alloca_inst, &indices, indices.len, "");
const llvm_elem = try self.dg.lowerValue(.{
const llvm_elem = try self.resolveValue(.{
.ty = array_info.elem_type,
.val = sent_val,
});