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linux: support VDSO for clock_gettime

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also fix a compiler crash when using cmpxchg with nullable pointer
This commit is contained in:
Andrew Kelley
2018-04-22 18:11:50 -04:00
parent da2af9c613
commit 21767144fc
10 changed files with 783 additions and 12 deletions
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10
src/codegen.cpp
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@@ -3561,6 +3561,16 @@ static LLVMValueRef ir_render_cmpxchg(CodeGen *g, IrExecutable *executable, IrIn
LLVMValueRef result_val = ZigLLVMBuildCmpXchg(g->builder, ptr_val, cmp_val, new_val,
success_order, failure_order, instruction->is_weak);
TypeTableEntry *maybe_type = instruction->base.value.type;
assert(maybe_type->id == TypeTableEntryIdMaybe);
TypeTableEntry *child_type = maybe_type->data.maybe.child_type;
if (type_is_codegen_pointer(child_type)) {
LLVMValueRef payload_val = LLVMBuildExtractValue(g->builder, result_val, 0, "");
LLVMValueRef success_bit = LLVMBuildExtractValue(g->builder, result_val, 1, "");
return LLVMBuildSelect(g->builder, success_bit, LLVMConstNull(child_type->type_ref), payload_val, "");
}
assert(instruction->tmp_ptr != nullptr);
assert(type_has_bits(instruction->type));