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Modifying lli to use the SectionMemoryManager.

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The functionality of SectionMemoryManager is equivalent to the LLIMCJITMemoryManager being replaced except that it allocates memory as RW and later changes it to RX or R as needed.  The page permissions are set in the call to MCJIT::finalizeObject.

llvm-svn: 168722
This commit is contained in:
Andrew Kaylor 2012-11-27 19:49:00 +00:00
parent ca8d63b46f
commit 74326c99fd
1 changed files with 10 additions and 222 deletions
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232
tools/lli/lli.cpp
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@ -28,6 +28,7 @@
#include "llvm/ExecutionEngine/JITEventListener.h"
#include "llvm/ExecutionEngine/JITMemoryManager.h"
#include "llvm/ExecutionEngine/MCJIT.h"
#include "llvm/ExecutionEngine/SectionMemoryManager.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/IRReader.h"
#include "llvm/Support/ManagedStatic.h"
@ -45,16 +46,6 @@
#include "llvm/Support/MathExtras.h"
#include <cerrno>
#ifdef __linux__
// These includes used by LLIMCJITMemoryManager::getPointerToNamedFunction()
// for Glibc trickery. Look comments in this function for more information.
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include <fcntl.h>
#include <unistd.h>
#endif
#ifdef __CYGWIN__
#include <cygwin/version.h>
#if defined(CYGWIN_VERSION_DLL_MAJOR) && CYGWIN_VERSION_DLL_MAJOR<1007
@ -217,214 +208,6 @@ static void do_shutdown() {
#endif
}
// Memory manager for MCJIT
class LLIMCJITMemoryManager : public JITMemoryManager {
public:
SmallVector<sys::MemoryBlock, 16> AllocatedDataMem;
SmallVector<sys::MemoryBlock, 16> AllocatedCodeMem;
SmallVector<sys::MemoryBlock, 16> FreeCodeMem;
LLIMCJITMemoryManager() { }
~LLIMCJITMemoryManager();
virtual uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
unsigned SectionID);
virtual uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
unsigned SectionID, bool IsReadOnly);
virtual void *getPointerToNamedFunction(const std::string &Name,
bool AbortOnFailure = true);
virtual bool applyPermissions(std::string *ErrMsg) { return false; }
// Invalidate instruction cache for code sections. Some platforms with
// separate data cache and instruction cache require explicit cache flush,
// otherwise JIT code manipulations (like resolved relocations) will get to
// the data cache but not to the instruction cache.
virtual void invalidateInstructionCache();
// The RTDyldMemoryManager doesn't use the following functions, so we don't
// need implement them.
virtual void setMemoryWritable() {
llvm_unreachable("Unexpected call!");
}
virtual void setMemoryExecutable() {
llvm_unreachable("Unexpected call!");
}
virtual void setPoisonMemory(bool poison) {
llvm_unreachable("Unexpected call!");
}
virtual void AllocateGOT() {
llvm_unreachable("Unexpected call!");
}
virtual uint8_t *getGOTBase() const {
llvm_unreachable("Unexpected call!");
return 0;
}
virtual uint8_t *startFunctionBody(const Function *F,
uintptr_t &ActualSize){
llvm_unreachable("Unexpected call!");
return 0;
}
virtual uint8_t *allocateStub(const GlobalValue* F, unsigned StubSize,
unsigned Alignment) {
llvm_unreachable("Unexpected call!");
return 0;
}
virtual void endFunctionBody(const Function *F, uint8_t *FunctionStart,
uint8_t *FunctionEnd) {
llvm_unreachable("Unexpected call!");
}
virtual uint8_t *allocateSpace(intptr_t Size, unsigned Alignment) {
llvm_unreachable("Unexpected call!");
return 0;
}
virtual uint8_t *allocateGlobal(uintptr_t Size, unsigned Alignment) {
llvm_unreachable("Unexpected call!");
return 0;
}
virtual void deallocateFunctionBody(void *Body) {
llvm_unreachable("Unexpected call!");
}
virtual uint8_t* startExceptionTable(const Function* F,
uintptr_t &ActualSize) {
llvm_unreachable("Unexpected call!");
return 0;
}
virtual void endExceptionTable(const Function *F, uint8_t *TableStart,
uint8_t *TableEnd, uint8_t* FrameRegister) {
llvm_unreachable("Unexpected call!");
}
virtual void deallocateExceptionTable(void *ET) {
llvm_unreachable("Unexpected call!");
}
};
uint8_t *LLIMCJITMemoryManager::allocateDataSection(uintptr_t Size,
unsigned Alignment,
unsigned SectionID,
bool IsReadOnly) {
if (!Alignment)
Alignment = 16;
// Ensure that enough memory is requested to allow aligning.
size_t NumElementsAligned = 1 + (Size + Alignment - 1)/Alignment;
uint8_t *Addr = (uint8_t*)calloc(NumElementsAligned, Alignment);
// Honour the alignment requirement.
uint8_t *AlignedAddr = (uint8_t*)RoundUpToAlignment((uint64_t)Addr, Alignment);
// Store the original address from calloc so we can free it later.
AllocatedDataMem.push_back(sys::MemoryBlock(Addr, NumElementsAligned*Alignment));
return AlignedAddr;
}
uint8_t *LLIMCJITMemoryManager::allocateCodeSection(uintptr_t Size,
unsigned Alignment,
unsigned SectionID) {
if (!Alignment)
Alignment = 16;
unsigned NeedAllocate = Alignment * ((Size + Alignment - 1)/Alignment + 1);
uintptr_t Addr = 0;
// Look in the list of free code memory regions and use a block there if one
// is available.
for (int i = 0, e = FreeCodeMem.size(); i != e; ++i) {
sys::MemoryBlock &MB = FreeCodeMem[i];
if (MB.size() >= NeedAllocate) {
Addr = (uintptr_t)MB.base();
uintptr_t EndOfBlock = Addr + MB.size();
// Align the address.
Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1);
// Store cutted free memory block.
FreeCodeMem[i] = sys::MemoryBlock((void*)(Addr + Size),
EndOfBlock - Addr - Size);
return (uint8_t*)Addr;
}
}
// No pre-allocated free block was large enough. Allocate a new memory region.
sys::MemoryBlock MB = sys::Memory::AllocateRWX(NeedAllocate, 0, 0);
AllocatedCodeMem.push_back(MB);
Addr = (uintptr_t)MB.base();
uintptr_t EndOfBlock = Addr + MB.size();
// Align the address.
Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1);
// The AllocateRWX may allocate much more memory than we need. In this case,
// we store the unused memory as a free memory block.
unsigned FreeSize = EndOfBlock-Addr-Size;
if (FreeSize > 16)
FreeCodeMem.push_back(sys::MemoryBlock((void*)(Addr + Size), FreeSize));
// Return aligned address
return (uint8_t*)Addr;
}
void LLIMCJITMemoryManager::invalidateInstructionCache() {
for (int i = 0, e = AllocatedCodeMem.size(); i != e; ++i)
sys::Memory::InvalidateInstructionCache(AllocatedCodeMem[i].base(),
AllocatedCodeMem[i].size());
}
static int jit_noop() {
return 0;
}
void *LLIMCJITMemoryManager::getPointerToNamedFunction(const std::string &Name,
bool AbortOnFailure) {
#if defined(__linux__)
//===--------------------------------------------------------------------===//
// Function stubs that are invoked instead of certain library calls
//
// Force the following functions to be linked in to anything that uses the
// JIT. This is a hack designed to work around the all-too-clever Glibc
// strategy of making these functions work differently when inlined vs. when
// not inlined, and hiding their real definitions in a separate archive file
// that the dynamic linker can't see. For more info, search for
// 'libc_nonshared.a' on Google, or read http://llvm.org/PR274.
if (Name == "stat") return (void*)(intptr_t)&stat;
if (Name == "fstat") return (void*)(intptr_t)&fstat;
if (Name == "lstat") return (void*)(intptr_t)&lstat;
if (Name == "stat64") return (void*)(intptr_t)&stat64;
if (Name == "fstat64") return (void*)(intptr_t)&fstat64;
if (Name == "lstat64") return (void*)(intptr_t)&lstat64;
if (Name == "atexit") return (void*)(intptr_t)&atexit;
if (Name == "mknod") return (void*)(intptr_t)&mknod;
#endif // __linux__
// We should not invoke parent's ctors/dtors from generated main()!
// On Mingw and Cygwin, the symbol __main is resolved to
// callee's(eg. tools/lli) one, to invoke wrong duplicated ctors
// (and register wrong callee's dtors with atexit(3)).
// We expect ExecutionEngine::runStaticConstructorsDestructors()
// is called before ExecutionEngine::runFunctionAsMain() is called.
if (Name == "__main") return (void*)(intptr_t)&jit_noop;
const char *NameStr = Name.c_str();
void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr);
if (Ptr) return Ptr;
// If it wasn't found and if it starts with an underscore ('_') character,
// try again without the underscore.
if (NameStr[0] == '_') {
Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr+1);
if (Ptr) return Ptr;
}
if (AbortOnFailure)
report_fatal_error("Program used external function '" + Name +
"' which could not be resolved!");
return 0;
}
LLIMCJITMemoryManager::~LLIMCJITMemoryManager() {
for (unsigned i = 0, e = AllocatedCodeMem.size(); i != e; ++i)
sys::Memory::ReleaseRWX(AllocatedCodeMem[i]);
for (unsigned i = 0, e = AllocatedDataMem.size(); i != e; ++i)
free(AllocatedDataMem[i].base());
}
void layoutRemoteTargetMemory(RemoteTarget *T, RecordingMemoryManager *JMM) {
// Lay out our sections in order, with all the code sections first, then
// all the data sections.
@ -564,7 +347,7 @@ int main(int argc, char **argv, char * const *envp) {
if (RemoteMCJIT)
JMM = new RecordingMemoryManager();
else
JMM = new LLIMCJITMemoryManager();
JMM = new SectionMemoryManager();
builder.setJITMemoryManager(JMM);
} else {
if (RemoteMCJIT) {
@ -665,8 +448,13 @@ int main(int argc, char **argv, char * const *envp) {
// MCJIT itself. FIXME.
//
// Run static constructors.
if (!RemoteMCJIT)
EE->runStaticConstructorsDestructors(false);
if (!RemoteMCJIT) {
if (UseMCJIT && !ForceInterpreter) {
// Give MCJIT a chance to apply relocations and set page permissions.
EE->finalizeObject();
}
EE->runStaticConstructorsDestructors(false);
}
if (NoLazyCompilation) {
for (Module::iterator I = Mod->begin(), E = Mod->end(); I != E; ++I) {
@ -713,7 +501,7 @@ int main(int argc, char **argv, char * const *envp) {
(void)EE->getPointerToFunction(EntryFn);
// Clear instruction cache before code will be executed.
if (JMM)
static_cast<LLIMCJITMemoryManager*>(JMM)->invalidateInstructionCache();
static_cast<SectionMemoryManager*>(JMM)->invalidateInstructionCache();
// Run main.
Result = EE->runFunctionAsMain(EntryFn, InputArgv, envp);