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
63 lines
1.7 KiB
LLVM
63 lines
1.7 KiB
LLVM
; RUN: opt < %s -dfsan -S | FileCheck %s
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; RUN: opt < %s -passes=dfsan -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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; CHECK-LABEL: @__dfsan_arg_tls
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; CHECK: = external thread_local(initialexec) global [100 x i64]
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; CHECK-LABEL: @__dfsan_retval_tls
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; CHECK: = external thread_local(initialexec) global [100 x i64]
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declare i32 @f(i32)
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declare float @llvm.sqrt.f32(float)
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; CHECK-LABEL: @"dfs$call"
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define i32 @call() {
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; CHECK: store{{.*}}__dfsan_arg_tls
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; CHECK: call{{.*}}@"dfs$f"
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; CHECK: load{{.*}}__dfsan_retval_tls
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%r = call i32 @f(i32 0)
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; CHECK-NOT: store{{.*}}__dfsan_arg_tls
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%i = call float @llvm.sqrt.f32(float -1.0)
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; CHECK: store{{.*}}__dfsan_retval_tls
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; CHECK: ret i32
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ret i32 %r
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}
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declare i32 @__gxx_personality_v0(...)
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declare i8* @__cxa_begin_catch(i8*)
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declare void @__cxa_end_catch()
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declare void @g(...)
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; CHECK-LABEL: @"dfs$h"
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; CHECK: personality {{.*}} @"dfs$__gxx_personality_v0" {{.*}} {
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define i32 @h() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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; CHECK: invoke void (...) @"dfs$g"(i32 42)
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invoke void (...) @g(i32 42)
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to label %try.cont unwind label %lpad
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lpad:
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%0 = landingpad { i8*, i32 }
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catch i8* null
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%1 = extractvalue { i8*, i32 } %0, 0
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; CHECK: store {{.*}} @__dfsan_arg_tls
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; CHECK: call {{.*}} @"dfs$__cxa_begin_catch"
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; CHECK: load {{.*}} @__dfsan_retval_tls
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%2 = tail call i8* @__cxa_begin_catch(i8* %1)
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; CHECK: call {{.*}} @"dfs$__cxa_end_catch"
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tail call void @__cxa_end_catch()
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br label %try.cont
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try.cont:
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ret i32 0
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}
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