#include "llvm/Function.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/Config/alloca.h"
+#include "llvm/Support/Compiler.h"
#include <cstdlib>
#include <cstring>
using namespace llvm;
#define ASMCALLSUFFIX
#endif
+// 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);
#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" 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!");
// 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
return X86CompilationCallback;
}
-void *X86JITInfo::emitGlobalValueLazyPtr(const GlobalValue* GV, void *ptr,
- MachineCodeEmitter &MCE) {
+void *X86JITInfo::emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
+ MachineCodeEmitter &MCE) {
#if defined (X86_64_JIT)
- MCE.startFunctionStub(GV, 8, 8);
+ MCE.startGVStub(GV, 8, 8);
MCE.emitWordLE((unsigned)(intptr_t)ptr);
MCE.emitWordLE((unsigned)(((intptr_t)ptr) >> 32));
#else
- MCE.startFunctionStub(GV, 4, 4);
+ MCE.startGVStub(GV, 4, 4);
MCE.emitWordLE((intptr_t)ptr);
#endif
- return MCE.finishFunctionStub(GV);
+ return MCE.finishGVStub(GV);
}
void *X86JITInfo::emitFunctionStub(const Function* F, void *Fn,
#endif
if (NotCC) {
#if defined (X86_64_JIT)
- MCE.startFunctionStub(F, 13, 4);
+ MCE.startGVStub(F, 13, 4);
MCE.emitByte(0x49); // REX prefix
MCE.emitByte(0xB8+2); // movabsq r10
MCE.emitWordLE((unsigned)(intptr_t)Fn);
MCE.emitByte(0xFF); // jmpq *r10
MCE.emitByte(2 | (4 << 3) | (3 << 6));
#else
- MCE.startFunctionStub(F, 5, 4);
+ MCE.startGVStub(F, 5, 4);
MCE.emitByte(0xE9);
MCE.emitWordLE((intptr_t)Fn-MCE.getCurrentPCValue()-4);
#endif
- return MCE.finishFunctionStub(F);
+ return MCE.finishGVStub(F);
}
#if defined (X86_64_JIT)
- MCE.startFunctionStub(F, 14, 4);
+ MCE.startGVStub(F, 14, 4);
MCE.emitByte(0x49); // REX prefix
MCE.emitByte(0xB8+2); // movabsq r10
MCE.emitWordLE((unsigned)(intptr_t)Fn);
MCE.emitByte(0xFF); // callq *r10
MCE.emitByte(2 | (2 << 3) | (3 << 6));
#else
- MCE.startFunctionStub(F, 6, 4);
+ MCE.startGVStub(F, 6, 4);
MCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...
MCE.emitWordLE((intptr_t)Fn-MCE.getCurrentPCValue()-4);
#endif
MCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub!
- return MCE.finishFunctionStub(F);
+ return MCE.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
}
}
}
+
+char* X86JITInfo::allocateThreadLocalMemory(size_t size) {
+#if defined(X86_32_JIT) && !defined(__APPLE__) && !defined(_MSC_VER)
+ TLSOffset -= size;
+ return TLSOffset;
+#else
+ assert(0 && "Cannot allocate thread local storage on this arch!\n");
+ return 0;
+#endif
+}