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[llvm-exegesis] Ensure that ExecutableFunction are aligned.

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Summary: Experiments show that this is the alignment we get (for ELF+Linux), but let's ensure that we have it.

Reviewers: gchatelet

Subscribers: tschuett, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68703

llvm-svn: 374170
This commit is contained in:
Clement Courbet 2019-10-09 14:25:08 +00:00
parent ed6415380f
commit 59fcff6cfd
1 changed files with 10 additions and 6 deletions
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16
tools/llvm-exegesis/lib/Assembler.cpp
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@ -21,6 +21,7 @@
#include "llvm/ExecutionEngine/SectionMemoryManager.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/Support/Alignment.h"
#include "llvm/Support/MemoryBuffer.h"
namespace llvm {
@ -28,6 +29,7 @@ namespace exegesis {
static constexpr const char ModuleID[] = "ExegesisInfoTest";
static constexpr const char FunctionID[] = "foo";
static const Align kFunctionAlignment(4096);
// Fills the given basic block with register setup code, and returns true if
// all registers could be setup correctly.
@ -169,13 +171,13 @@ void assembleToStream(const ExegesisTarget &ET,
ArrayRef<unsigned> LiveIns,
ArrayRef<RegisterValue> RegisterInitialValues,
const FillFunction &Fill, raw_pwrite_stream &AsmStream) {
std::unique_ptr<LLVMContext> Context = std::make_unique<LLVMContext>();
auto Context = std::make_unique<LLVMContext>();
std::unique_ptr<Module> Module =
createModule(Context, TM->createDataLayout());
std::unique_ptr<MachineModuleInfoWrapperPass> MMIWP =
std::make_unique<MachineModuleInfoWrapperPass>(TM.get());
auto MMIWP = std::make_unique<MachineModuleInfoWrapperPass>(TM.get());
MachineFunction &MF = createVoidVoidPtrMachineFunction(
FunctionID, Module.get(), &MMIWP.get()->getMMI());
MF.ensureAlignment(kFunctionAlignment);
// We need to instruct the passes that we're done with SSA and virtual
// registers.
@ -305,9 +307,11 @@ ExecutableFunction::ExecutableFunction(
// executable page.
ExecEngine->addObjectFile(std::move(ObjectFileHolder));
// Fetching function bytes.
FunctionBytes = StringRef(reinterpret_cast<const char *>(
ExecEngine->getFunctionAddress(FunctionID)),
CodeSize);
const uint64_t FunctionAddress = ExecEngine->getFunctionAddress(FunctionID);
assert(isAligned(kFunctionAlignment, FunctionAddress) &&
"function is not properly aligned");
FunctionBytes =
StringRef(reinterpret_cast<const char *>(FunctionAddress), CodeSize);
}
} // namespace exegesis