#include "X86JITInfo.h"
#include "X86Relocations.h"
#include "X86Subtarget.h"
+#include "X86TargetMachine.h"
#include "llvm/Function.h"
-#include "llvm/CodeGen/MachineCodeEmitter.h"
-#include "llvm/Config/alloca.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/ErrorHandling.h"
#include <cstdlib>
#include <cstring>
using namespace llvm;
// Determine the platform we're running on
-#if defined (__x86_64__) || defined (_M_AMD64)
+#if defined (__x86_64__) || defined (_M_AMD64) || defined (_M_X64)
# define X86_64_JIT
#elif defined(__i386__) || defined(i386) || defined(_M_IX86)
# define X86_32_JIT
#define GETASMPREFIX(X) GETASMPREFIX2(X)
#define ASMPREFIX GETASMPREFIX(__USER_LABEL_PREFIX__)
+// For ELF targets, use a .size and .type directive, to let tools
+// know the extent of functions defined in assembler.
+#if defined(__ELF__)
+# define SIZE(sym) ".size " #sym ", . - " #sym "\n"
+# define TYPE_FUNCTION(sym) ".type " #sym ", @function\n"
+#else
+# define SIZE(sym)
+# define TYPE_FUNCTION(sym)
+#endif
+
// Provide a convenient way for disabling usage of CFI directives.
// This is needed for old/broken assemblers (for example, gas on
// Darwin is pretty old and doesn't support these directives)
".text\n"
".align 8\n"
".globl " ASMPREFIX "X86CompilationCallback\n"
+ TYPE_FUNCTION(X86CompilationCallback)
ASMPREFIX "X86CompilationCallback:\n"
CFI(".cfi_startproc\n")
// Save RBP
CFI(".cfi_restore %rbp\n")
"ret\n"
CFI(".cfi_endproc\n")
+ SIZE(X86CompilationCallback)
);
# else
// No inline assembler support on this platform. The routine is in external
asm(
".text\n"
".align 8\n"
- ".globl " ASMPREFIX "X86CompilationCallback\n"
+ ".globl " ASMPREFIX "X86CompilationCallback\n"
+ TYPE_FUNCTION(X86CompilationCallback)
ASMPREFIX "X86CompilationCallback:\n"
CFI(".cfi_startproc\n")
"pushl %ebp\n"
CFI(".cfi_restore %ebp\n")
"ret\n"
CFI(".cfi_endproc\n")
+ SIZE(X86CompilationCallback)
);
// Same as X86CompilationCallback but also saves XMM argument registers.
asm(
".text\n"
".align 8\n"
- ".globl " ASMPREFIX "X86CompilationCallback_SSE\n"
+ ".globl " ASMPREFIX "X86CompilationCallback_SSE\n"
+ TYPE_FUNCTION(X86CompilationCallback_SSE)
ASMPREFIX "X86CompilationCallback_SSE:\n"
CFI(".cfi_startproc\n")
"pushl %ebp\n"
CFI(".cfi_restore %ebp\n")
"ret\n"
CFI(".cfi_endproc\n")
+ SIZE(X86CompilationCallback_SSE)
);
# else
void X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr);
#else // Not an i386 host
void X86CompilationCallback() {
- assert(0 && "Cannot call X86CompilationCallback() on a non-x86 arch!\n");
- abort();
+ llvm_unreachable("Cannot call X86CompilationCallback() on a non-x86 arch!");
}
#endif
}
-/// X86CompilationCallback - This is the target-specific function invoked by the
+/// X86CompilationCallback2 - This is the target-specific function invoked by the
/// function stub when we did not know the real target of a call. This function
/// must locate the start of the stub or call site and pass it into the JIT
/// compiler function.
-extern "C" void X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) {
+extern "C" {
+#if !(defined (X86_64_JIT) && defined(_MSC_VER))
+ // the following function is called only from this translation unit,
+ // unless we are under 64bit Windows with MSC, where there is
+ // no support for inline assembly
+static
+#endif
+void ATTRIBUTE_USED
+X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) {
intptr_t *RetAddrLoc = &StackPtr[1];
assert(*RetAddrLoc == RetAddr &&
"Could not find return address on the stack!");
#endif
#if 0
- DOUT << "In callback! Addr=" << (void*)RetAddr
- << " ESP=" << (void*)StackPtr
- << ": Resolving call to function: "
- << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n";
+ DEBUG(errs() << "In callback! Addr=" << (void*)RetAddr
+ << " ESP=" << (void*)StackPtr
+ << ": Resolving call to function: "
+ << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n");
#endif
// Sanity check to make sure this really is a call instruction.
// Rewrite the call target... so that we don't end up here every time we
// execute the call.
#if defined (X86_64_JIT)
- *(intptr_t *)(RetAddr - 0xa) = NewVal;
+ if (!isStub)
+ *(intptr_t *)(RetAddr - 0xa) = NewVal;
#else
*(intptr_t *)RetAddr = (intptr_t)(NewVal-RetAddr-4);
#endif
// when the requested function finally gets called. This also makes the
// 0xCD byte (interrupt) dead, so the marker doesn't effect anything.
#if defined (X86_64_JIT)
- ((unsigned char*)RetAddr)[0] = (2 | (4 << 3) | (3 << 6));
+ // If the target address is within 32-bit range of the stub, use a
+ // PC-relative branch instead of loading the actual address. (This is
+ // considerably shorter than the 64-bit immediate load already there.)
+ // We assume here intptr_t is 64 bits.
+ intptr_t diff = NewVal-RetAddr+7;
+ if (diff >= -2147483648LL && diff <= 2147483647LL) {
+ *(unsigned char*)(RetAddr-0xc) = 0xE9;
+ *(intptr_t *)(RetAddr-0xb) = diff & 0xffffffff;
+ } else {
+ *(intptr_t *)(RetAddr - 0xa) = NewVal;
+ ((unsigned char*)RetAddr)[0] = (2 | (4 << 3) | (3 << 6));
+ }
#else
((unsigned char*)RetAddr)[-1] = 0xE9;
#endif
*RetAddrLoc -= 5;
#endif
}
+}
TargetJITInfo::LazyResolverFn
X86JITInfo::getLazyResolverFunction(JITCompilerFn F) {
JITCompilerFunction = F;
#if defined (X86_32_JIT) && !defined (_MSC_VER)
- unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
- union {
- unsigned u[3];
- char c[12];
- } text;
-
- if (!X86::GetCpuIDAndInfo(0, &EAX, text.u+0, text.u+2, text.u+1)) {
- // FIXME: support for AMD family of processors.
- if (memcmp(text.c, "GenuineIntel", 12) == 0) {
- X86::GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX);
- if ((EDX >> 25) & 0x1)
- return X86CompilationCallback_SSE;
- }
- }
+ if (Subtarget->hasSSE1())
+ return X86CompilationCallback_SSE;
#endif
return X86CompilationCallback;
}
-void *X86JITInfo::emitGlobalValueLazyPtr(const GlobalValue* GV, void *ptr,
- MachineCodeEmitter &MCE) {
+X86JITInfo::X86JITInfo(X86TargetMachine &tm) : TM(tm) {
+ Subtarget = &TM.getSubtarget<X86Subtarget>();
+ useGOT = 0;
+ TLSOffset = 0;
+}
+
+void *X86JITInfo::emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
+ JITCodeEmitter &JCE) {
#if defined (X86_64_JIT)
- MCE.startFunctionStub(GV, 8, 8);
- MCE.emitWordLE((unsigned)(intptr_t)ptr);
- MCE.emitWordLE((unsigned)(((intptr_t)ptr) >> 32));
+ JCE.startGVStub(GV, 8, 8);
+ JCE.emitWordLE((unsigned)(intptr_t)ptr);
+ JCE.emitWordLE((unsigned)(((intptr_t)ptr) >> 32));
#else
- MCE.startFunctionStub(GV, 4, 4);
- MCE.emitWordLE((intptr_t)ptr);
+ JCE.startGVStub(GV, 4, 4);
+ JCE.emitWordLE((intptr_t)ptr);
#endif
- return MCE.finishFunctionStub(GV);
+ return JCE.finishGVStub(GV);
}
void *X86JITInfo::emitFunctionStub(const Function* F, void *Fn,
- MachineCodeEmitter &MCE) {
+ JITCodeEmitter &JCE) {
// Note, we cast to intptr_t here to silence a -pedantic warning that
// complains about casting a function pointer to a normal pointer.
#if defined (X86_32_JIT) && !defined (_MSC_VER)
#endif
if (NotCC) {
#if defined (X86_64_JIT)
- MCE.startFunctionStub(F, 13, 4);
- MCE.emitByte(0x49); // REX prefix
- MCE.emitByte(0xB8+2); // movabsq r10
- MCE.emitWordLE((unsigned)(intptr_t)Fn);
- MCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32));
- MCE.emitByte(0x41); // REX prefix
- MCE.emitByte(0xFF); // jmpq *r10
- MCE.emitByte(2 | (4 << 3) | (3 << 6));
+ JCE.startGVStub(F, 13, 4);
+ JCE.emitByte(0x49); // REX prefix
+ JCE.emitByte(0xB8+2); // movabsq r10
+ JCE.emitWordLE((unsigned)(intptr_t)Fn);
+ JCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32));
+ JCE.emitByte(0x41); // REX prefix
+ JCE.emitByte(0xFF); // jmpq *r10
+ JCE.emitByte(2 | (4 << 3) | (3 << 6));
#else
- MCE.startFunctionStub(F, 5, 4);
- MCE.emitByte(0xE9);
- MCE.emitWordLE((intptr_t)Fn-MCE.getCurrentPCValue()-4);
+ JCE.startGVStub(F, 5, 4);
+ JCE.emitByte(0xE9);
+ JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
#endif
- return MCE.finishFunctionStub(F);
+ return JCE.finishGVStub(F);
}
#if defined (X86_64_JIT)
- MCE.startFunctionStub(F, 14, 4);
- MCE.emitByte(0x49); // REX prefix
- MCE.emitByte(0xB8+2); // movabsq r10
- MCE.emitWordLE((unsigned)(intptr_t)Fn);
- MCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32));
- MCE.emitByte(0x41); // REX prefix
- MCE.emitByte(0xFF); // callq *r10
- MCE.emitByte(2 | (2 << 3) | (3 << 6));
+ JCE.startGVStub(F, 14, 4);
+ JCE.emitByte(0x49); // REX prefix
+ JCE.emitByte(0xB8+2); // movabsq r10
+ JCE.emitWordLE((unsigned)(intptr_t)Fn);
+ JCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32));
+ JCE.emitByte(0x41); // REX prefix
+ JCE.emitByte(0xFF); // callq *r10
+ JCE.emitByte(2 | (2 << 3) | (3 << 6));
#else
- MCE.startFunctionStub(F, 6, 4);
- MCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...
+ JCE.startGVStub(F, 6, 4);
+ JCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...
- MCE.emitWordLE((intptr_t)Fn-MCE.getCurrentPCValue()-4);
+ JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
#endif
- MCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub!
- return MCE.finishFunctionStub(F);
+ JCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub!
+ return JCE.finishGVStub(F);
+}
+
+void X86JITInfo::emitFunctionStubAtAddr(const Function* F, void *Fn, void *Stub,
+ JITCodeEmitter &JCE) {
+ // Note, we cast to intptr_t here to silence a -pedantic warning that
+ // complains about casting a function pointer to a normal pointer.
+ JCE.startGVStub(F, Stub, 5);
+ JCE.emitByte(0xE9);
+#if defined (X86_64_JIT) && !defined (NDEBUG)
+ // Yes, we need both of these casts, or some broken versions of GCC (4.2.4)
+ // get the signed-ness of the expression wrong. Go figure.
+ intptr_t Displacement = (intptr_t)Fn - (intptr_t)JCE.getCurrentPCValue() - 5;
+ assert(((Displacement << 32) >> 32) == Displacement
+ && "PIC displacement does not fit in displacement field!");
+#endif
+ JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
+ JCE.finishGVStub(F);
}
/// getPICJumpTableEntry - Returns the value of the jumptable entry for the
/// specific basic block.
-intptr_t X86JITInfo::getPICJumpTableEntry(intptr_t BB, intptr_t Entry) {
+uintptr_t X86JITInfo::getPICJumpTableEntry(uintptr_t BB, uintptr_t Entry) {
+#if defined(X86_64_JIT)
+ return BB - Entry;
+#else
return BB - PICBase;
+#endif
}
/// relocate - Before the JIT can run a block of code that has been emitted,
break;
}
case X86::reloc_absolute_word:
+ case X86::reloc_absolute_word_sext:
// Absolute relocation, just add the relocated value to the value already
// in memory.
*((unsigned*)RelocPos) += (unsigned)ResultPtr;
}
}
}
+
+char* X86JITInfo::allocateThreadLocalMemory(size_t size) {
+#if defined(X86_32_JIT) && !defined(__APPLE__) && !defined(_MSC_VER)
+ TLSOffset -= size;
+ return TLSOffset;
+#else
+ llvm_unreachable("Cannot allocate thread local storage on this arch!");
+ return 0;
+#endif
+}