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-rw-r--r--tools/lli/lli.cpp210
1 files changed, 207 insertions, 3 deletions
diff --git a/tools/lli/lli.cpp b/tools/lli/lli.cpp
index 2e2bf7d66ec3..b6c9299c65b5 100644
--- a/tools/lli/lli.cpp
+++ b/tools/lli/lli.cpp
@@ -35,8 +35,20 @@
#include "llvm/Support/Process.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/DynamicLibrary.h"
+#include "llvm/Support/Memory.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
@@ -175,6 +187,191 @@ 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);
+
+ virtual void *getPointerToNamedFunction(const std::string &Name,
+ bool AbortOnFailure = true);
+
+ // 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 MCJITMemoryManager 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) {
+ if (!Alignment)
+ Alignment = 16;
+ uint8_t *Addr = (uint8_t*)calloc((Size + Alignment - 1)/Alignment, Alignment);
+ AllocatedDataMem.push_back(sys::MemoryBlock(Addr, Size));
+ return Addr;
+}
+
+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());
+}
+
+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__
+
+ 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());
+}
+
//===----------------------------------------------------------------------===//
// main Driver function
//
@@ -222,8 +419,6 @@ int main(int argc, char **argv, char * const *envp) {
builder.setRelocationModel(RelocModel);
builder.setCodeModel(CMModel);
builder.setErrorStr(&ErrorMsg);
- builder.setJITMemoryManager(ForceInterpreter ? 0 :
- JITMemoryManager::CreateDefaultMemManager());
builder.setEngineKind(ForceInterpreter
? EngineKind::Interpreter
: EngineKind::JIT);
@@ -233,9 +428,14 @@ int main(int argc, char **argv, char * const *envp) {
Mod->setTargetTriple(Triple::normalize(TargetTriple));
// Enable MCJIT if desired.
+ LLIMCJITMemoryManager *JMM = 0;
if (UseMCJIT && !ForceInterpreter) {
builder.setUseMCJIT(true);
- builder.setJITMemoryManager(JITMemoryManager::CreateDefaultMemManager());
+ JMM = new LLIMCJITMemoryManager();
+ builder.setJITMemoryManager(JMM);
+ } else {
+ builder.setJITMemoryManager(ForceInterpreter ? 0 :
+ JITMemoryManager::CreateDefaultMemManager());
}
CodeGenOpt::Level OLvl = CodeGenOpt::Default;
@@ -266,6 +466,10 @@ int main(int argc, char **argv, char * const *envp) {
exit(1);
}
+ // Clear instruction cache before code will be executed.
+ if (JMM)
+ JMM->invalidateInstructionCache();
+
// The following functions have no effect if their respective profiling
// support wasn't enabled in the build configuration.
EE->RegisterJITEventListener(
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 02:19:26 +0000