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[asan] don't instrument module CTORs that may be run before asan.module_ctor. This fixes asan running together -coverage

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llvm-svn: 218421
This commit is contained in:
Kostya Serebryany 2014-09-24 22:41:55 +00:00
parent 0589111019
commit 8fdd214f67
2 changed files with 21 additions and 9 deletions
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10
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -71,7 +71,7 @@ static const uintptr_t kRetiredStackFrameMagic = 0x45E0360E;
static const char *const kAsanModuleCtorName = "asan.module_ctor";
static const char *const kAsanModuleDtorName = "asan.module_dtor";
static const int kAsanCtorAndDtorPriority = 1;
static const uint64_t kAsanCtorAndDtorPriority = 1;
static const char *const kAsanReportErrorTemplate = "__asan_report_";
static const char *const kAsanReportLoadN = "__asan_report_load_n";
static const char *const kAsanReportStoreN = "__asan_report_store_n";
@ -928,10 +928,12 @@ void AddressSanitizerModule::createInitializerPoisonCalls(
ConstantStruct *CS = cast<ConstantStruct>(OP);
// Must have a function or null ptr.
// (CS->getOperand(0) is the init priority.)
if (Function* F = dyn_cast<Function>(CS->getOperand(1))) {
if (F->getName() != kAsanModuleCtorName)
poisonOneInitializer(*F, ModuleName);
if (F->getName() == kAsanModuleCtorName) continue;
ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
// Don't instrument CTORs that will run before asan.module_ctor.
if (Priority->getLimitedValue() <= kAsanCtorAndDtorPriority) continue;
poisonOneInitializer(*F, ModuleName);
}
}
}

20
test/Instrumentation/AddressSanitizer/instrument_initializer_metadata.ll
View File

@ -25,29 +25,39 @@ entry:
ret void
}
@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @_GLOBAL__I_a }]
@llvm.global_ctors = appending global [2 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @__late_ctor }, { i32, void ()* } { i32 0, void ()* @__early_ctor }]
define internal void @_GLOBAL__I_a() sanitize_address section ".text.startup" {
define internal void @__late_ctor() sanitize_address section ".text.startup" {
entry:
call void @__cxx_global_var_init()
ret void
}
; Clang indicated that @xxx was dynamically initailized.
; __asan_{before,after}_dynamic_init should be called from _GLOBAL__I_a
; __asan_{before,after}_dynamic_init should be called from __late_ctor
; CHECK: define internal void @_GLOBAL__I_a
; CHECK-LABEL: define internal void @__late_ctor
; CHECK-NOT: ret
; CHECK: call void @__asan_before_dynamic_init
; CHECK: call void @__cxx_global_var_init
; CHECK: call void @__asan_after_dynamic_init
; CHECK: ret
; CTOR with priority 0 should not be instrumented.
define internal void @__early_ctor() sanitize_address section ".text.startup" {
entry:
call void @__cxx_global_var_init()
ret void
}
; CHECK-LABEL: define internal void @__early_ctor
; CHECK-NOT: __asan
; CHECK: ret
; Check that xxx is instrumented.
define void @touch_xxx() sanitize_address {
store i32 0, i32 *@xxx, align 4
ret void
; CHECK: define void @touch_xxx
; CHECK-LABEL: touch_xxx
; CHECK: call void @__asan_report_store4
; CHECK: ret void
}