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[sancov] Fix PR33732

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Coverage hooks that take less-than-64-bit-integers as parameters need the
zeroext parameter attribute (http://llvm.org/docs/LangRef.html#paramattrs)
to make sure they are properly extended by the x86_64 ABI.

llvm-svn: 308296
This commit is contained in:
Alexander Potapenko 2017-07-18 11:47:56 +00:00
parent 0636fbd737
commit 9385aaa848
3 changed files with 54 additions and 0 deletions
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10
llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
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@ -281,6 +281,16 @@ bool SanitizerCoverageModule::runOnModule(Module &M) {
SanCovTraceSwitchFunction =
checkSanitizerInterfaceFunction(M.getOrInsertFunction(
SanCovTraceSwitchName, VoidTy, Int64Ty, Int64PtrTy));
// Make sure smaller parameters are zero-extended to i64 as required by the
// x86_64 ABI.
if (TargetTriple.getArch() == Triple::x86_64) {
for (int i = 0; i < 3; i++) {
SanCovTraceCmpFunction[i]->addParamAttr(0, Attribute::ZExt);
SanCovTraceCmpFunction[i]->addParamAttr(1, Attribute::ZExt);
}
SanCovTraceDivFunction[0]->addParamAttr(0, Attribute::ZExt);
}
// We insert an empty inline asm after cov callbacks to avoid callback merge.
EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false),

22
llvm/test/Instrumentation/SanitizerCoverage/cmp-tracing-api-x86_32.ll Normal file
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@ -0,0 +1,22 @@
; Test -sanitizer-coverage-trace-compares=1 API declarations on a non-x86_64 arch
; RUN: opt < %s -sancov -sanitizer-coverage-level=1 -sanitizer-coverage-trace-compares=1 -S | FileCheck %s
target triple = "x86_32-unknown-linux-gnu"
define i32 @foo() #0 {
entry:
ret i32 0
}
; CHECK: declare void @__sanitizer_cov_trace_pc_indir(i64)
; CHECK: declare void @__sanitizer_cov_trace_cmp1(i8, i8)
; CHECK: declare void @__sanitizer_cov_trace_cmp2(i16, i16)
; CHECK: declare void @__sanitizer_cov_trace_cmp4(i32, i32)
; CHECK: declare void @__sanitizer_cov_trace_cmp8(i64, i64)
; CHECK: declare void @__sanitizer_cov_trace_div4(i32)
; CHECK: declare void @__sanitizer_cov_trace_div8(i64)
; CHECK: declare void @__sanitizer_cov_trace_gep(i64)
; CHECK: declare void @__sanitizer_cov_trace_switch(i64, i64*)
; CHECK: declare void @__sanitizer_cov_trace_pc()
; CHECK: declare void @__sanitizer_cov_trace_pc_guard(i32*)
; CHECK: declare void @__sanitizer_cov_trace_pc_guard_init(i32*, i32*)
; CHECK-NOT: declare

22
llvm/test/Instrumentation/SanitizerCoverage/cmp-tracing-api-x86_64.ll Normal file
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@ -0,0 +1,22 @@
; Test -sanitizer-coverage-trace-compares=1 API declarations on x86_64
; RUN: opt < %s -sancov -sanitizer-coverage-level=1 -sanitizer-coverage-trace-compares=1 -S | FileCheck %s
target triple = "x86_64-unknown-linux-gnu"
define i32 @foo() #0 {
entry:
ret i32 0
}
; CHECK: declare void @__sanitizer_cov_trace_pc_indir(i64)
; CHECK: declare void @__sanitizer_cov_trace_cmp1(i8 zeroext, i8 zeroext)
; CHECK: declare void @__sanitizer_cov_trace_cmp2(i16 zeroext, i16 zeroext)
; CHECK: declare void @__sanitizer_cov_trace_cmp4(i32 zeroext, i32 zeroext)
; CHECK: declare void @__sanitizer_cov_trace_cmp8(i64, i64)
; CHECK: declare void @__sanitizer_cov_trace_div4(i32 zeroext)
; CHECK: declare void @__sanitizer_cov_trace_div8(i64)
; CHECK: declare void @__sanitizer_cov_trace_gep(i64)
; CHECK: declare void @__sanitizer_cov_trace_switch(i64, i64*)
; CHECK: declare void @__sanitizer_cov_trace_pc()
; CHECK: declare void @__sanitizer_cov_trace_pc_guard(i32*)
; CHECK: declare void @__sanitizer_cov_trace_pc_guard_init(i32*, i32*)
; CHECK-NOT: declare