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[sancov] using comdat only when it is enabled

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Differential Revision: https://reviews.llvm.org/D29733

llvm-svn: 294529
This commit is contained in:
Mike Aizatsky 2017-02-08 23:12:46 +00:00
parent 133aefc634
commit 724efe430b
4 changed files with 91 additions and 16 deletions
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10
lib/Transforms/Instrumentation/SanitizerCoverage.cpp
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@ -382,9 +382,13 @@ bool SanitizerCoverageModule::runOnModule(Module &M) {
{IRB.CreatePointerCast(SecStart, Int32PtrTy),
IRB.CreatePointerCast(SecEnd, Int32PtrTy)});
// Use comdat to dedup CtorFunc.
CtorFunc->setComdat(M.getOrInsertComdat(SanCovModuleCtorName));
appendToGlobalCtors(M, CtorFunc, SanCtorAndDtorPriority, CtorFunc);
if (TargetTriple.supportsCOMDAT()) {
// Use comdat to dedup CtorFunc.
CtorFunc->setComdat(M.getOrInsertComdat(SanCovModuleCtorName));
appendToGlobalCtors(M, CtorFunc, SanCtorAndDtorPriority, CtorFunc);
} else {
appendToGlobalCtors(M, CtorFunc, SanCtorAndDtorPriority);
}
}
} else if (!Options.TracePC) {
Function *CtorFunc;

13
test/Instrumentation/SanitizerCoverage/coverage.ll
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@ -7,7 +7,6 @@
; RUN: opt < %s -sancov -sanitizer-coverage-level=3 -sanitizer-coverage-block-threshold=10 -S | FileCheck %s --check-prefix=CHECK3
; RUN: opt < %s -sancov -sanitizer-coverage-level=4 -S | FileCheck %s --check-prefix=CHECK4
; RUN: opt < %s -sancov -sanitizer-coverage-level=4 -sanitizer-coverage-trace-pc -S | FileCheck %s --check-prefix=CHECK_TRACE_PC
; RUN: opt < %s -sancov -sanitizer-coverage-level=4 -sanitizer-coverage-trace-pc-guard -S | FileCheck %s --check-prefix=CHECK_TRACE_PC_GUARD
; RUN: opt < %s -sancov -sanitizer-coverage-level=3 -sanitizer-coverage-8bit-counters=1 -S | FileCheck %s --check-prefix=CHECK-8BIT
; RUN: opt < %s -sancov -sanitizer-coverage-level=2 -sanitizer-coverage-block-threshold=10 \
@ -131,18 +130,6 @@ entry:
; CHECK_TRACE_PC: call void @__sanitizer_cov_trace_pc_indir
; CHECK_TRACE_PC: ret void
; CHECK_TRACE_PC_GUARD-LABEL: define void @foo
; CHECK_TRACE_PC_GUARD: call void @__sanitizer_cov_trace_pc
; CHECK_TRACE_PC_GUARD: call void asm sideeffect "", ""()
; CHECK_TRACE_PC_GUARD: ret void
; CHECK_TRACE_PC_GUARD-LABEL: define void @CallViaVptr
; CHECK_TRACE_PC_GUARD: call void @__sanitizer_cov_trace_pc_indir
; CHECK_TRACE_PC_GUARD: call void @__sanitizer_cov_trace_pc_indir
; CHECK_TRACE_PC_GUARD: ret void
; CHECK_TRACE_PC_GUARD-LABEL: define internal void @sancov.module_ctor() comdat
define void @call_unreachable() uwtable sanitize_address {
entry:
unreachable

42
test/Instrumentation/SanitizerCoverage/trace-pc-guard-comdat.ll Normal file
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@ -0,0 +1,42 @@
; RUN: opt < %s -sancov -sanitizer-coverage-level=4 -sanitizer-coverage-trace-pc-guard -S | FileCheck %s --check-prefix=CHECK_TRACE_PC_GUARD
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"
target triple = "x86_64-unknown-linux-gnu"
define void @foo(i32* %a) sanitize_address {
entry:
%tobool = icmp eq i32* %a, null
br i1 %tobool, label %if.end, label %if.then
if.then: ; preds = %entry
store i32 0, i32* %a, align 4
br label %if.end
if.end: ; preds = %entry, %if.then
ret void
}
%struct.StructWithVptr = type { i32 (...)** }
define void @CallViaVptr(%struct.StructWithVptr* %foo) uwtable sanitize_address {
entry:
%0 = bitcast %struct.StructWithVptr* %foo to void (%struct.StructWithVptr*)***
%vtable = load void (%struct.StructWithVptr*)**, void (%struct.StructWithVptr*)*** %0, align 8
%1 = load void (%struct.StructWithVptr*)*, void (%struct.StructWithVptr*)** %vtable, align 8
tail call void %1(%struct.StructWithVptr* %foo)
tail call void %1(%struct.StructWithVptr* %foo)
tail call void asm sideeffect "", ""()
ret void
}
; CHECK_TRACE_PC_GUARD-LABEL: define void @foo
; CHECK_TRACE_PC_GUARD: call void @__sanitizer_cov_trace_pc
; CHECK_TRACE_PC_GUARD: call void asm sideeffect "", ""()
; CHECK_TRACE_PC_GUARD: ret void
; CHECK_TRACE_PC_GUARD-LABEL: define void @CallViaVptr
; CHECK_TRACE_PC_GUARD: call void @__sanitizer_cov_trace_pc_indir
; CHECK_TRACE_PC_GUARD: call void @__sanitizer_cov_trace_pc_indir
; CHECK_TRACE_PC_GUARD: ret void
; CHECK_TRACE_PC_GUARD-LABEL: define internal void @sancov.module_ctor() comdat

42
test/Instrumentation/SanitizerCoverage/trace-pc-guard-nocomdat.ll Normal file
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@ -0,0 +1,42 @@
; RUN: opt < %s -sancov -sanitizer-coverage-level=4 -sanitizer-coverage-trace-pc-guard -S | FileCheck %s --check-prefix=CHECK_TRACE_PC_GUARD
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"
target triple = "x86_64-apple-darwin10.0.0"
define void @foo(i32* %a) sanitize_address {
entry:
%tobool = icmp eq i32* %a, null
br i1 %tobool, label %if.end, label %if.then
if.then: ; preds = %entry
store i32 0, i32* %a, align 4
br label %if.end
if.end: ; preds = %entry, %if.then
ret void
}
%struct.StructWithVptr = type { i32 (...)** }
define void @CallViaVptr(%struct.StructWithVptr* %foo) uwtable sanitize_address {
entry:
%0 = bitcast %struct.StructWithVptr* %foo to void (%struct.StructWithVptr*)***
%vtable = load void (%struct.StructWithVptr*)**, void (%struct.StructWithVptr*)*** %0, align 8
%1 = load void (%struct.StructWithVptr*)*, void (%struct.StructWithVptr*)** %vtable, align 8
tail call void %1(%struct.StructWithVptr* %foo)
tail call void %1(%struct.StructWithVptr* %foo)
tail call void asm sideeffect "", ""()
ret void
}
; CHECK_TRACE_PC_GUARD-LABEL: define void @foo
; CHECK_TRACE_PC_GUARD: call void @__sanitizer_cov_trace_pc
; CHECK_TRACE_PC_GUARD: call void asm sideeffect "", ""()
; CHECK_TRACE_PC_GUARD: ret void
; CHECK_TRACE_PC_GUARD-LABEL: define void @CallViaVptr
; CHECK_TRACE_PC_GUARD: call void @__sanitizer_cov_trace_pc_indir
; CHECK_TRACE_PC_GUARD: call void @__sanitizer_cov_trace_pc_indir
; CHECK_TRACE_PC_GUARD: ret void
; CHECK_TRACE_PC_GUARD-LABEL: define internal void @sancov.module_ctor() {