80e326a8c4
This is a child diff of D92261. It extended TLS arg/ret to work with aggregate types. For a function t foo(t1 a1, t2 a2, ... tn an) Its arguments shadow are saved in TLS args like a1_s, a2_s, ..., an_s TLS ret simply includes r_s. By calculating the type size of each shadow value, we can get their offset. This is similar to what MSan does. See __msan_retval_tls and __msan_param_tls from llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp. Note that this change does not add test cases for overflowed TLS arg/ret because this is hard to test w/o supporting aggregate shdow types. We will be adding them after supporting that. Reviewed-by: morehouse Differential Revision: https://reviews.llvm.org/D92440
29 lines
904 B
LLVM
29 lines
904 B
LLVM
; RUN: opt < %s -dfsan -dfsan-event-callbacks=1 -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define i8 @load8(i8* %p) {
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; CHECK: call void @__dfsan_load_callback(i16 %{{.*}}, i8* %p)
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; CHECK: %a = load i8, i8* %p
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%a = load i8, i8* %p
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ret i8 %a
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}
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define void @store8(i8* %p, i8 %a) {
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; CHECK: store i16 %[[l:.*]], i16* %{{.*}}
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; CHECK: call void @__dfsan_store_callback(i16 %[[l]], i8* %p)
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; CHECK: store i8 %a, i8* %p
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store i8 %a, i8* %p
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ret void
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}
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define i1 @cmp(i8 %a, i8 %b) {
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; CHECK: call void @__dfsan_cmp_callback(i16 %[[l:.*]])
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; CHECK: %c = icmp ne i8 %a, %b
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; CHECK: store i16 %[[l]], i16* bitcast ({{.*}}* @__dfsan_retval_tls to i16*)
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%c = icmp ne i8 %a, %b
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ret i1 %c
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} |