It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Alpha/AlphaJITInfo.cpp b/lib/Target/Alpha/AlphaJITInfo.cpp
new file mode 100644
index 0000000..669a2d5
--- /dev/null
+++ b/lib/Target/Alpha/AlphaJITInfo.cpp
@@ -0,0 +1,305 @@
+//===-- AlphaJITInfo.cpp - Implement the JIT interfaces for the Alpha ---===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the JIT interfaces for the Alpha target.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "jit"
+#include "AlphaJITInfo.h"
+#include "AlphaRelocations.h"
+#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/Config/alloca.h"
+#include "llvm/Support/Debug.h"
+#include <cstdlib>
+#include <map>
+using namespace llvm;
+
+#define BUILD_OFormatI(Op, RA, LIT, FUN, RC) \
+ ((Op << 26) | (RA << 21) | (LIT << 13) | (1 << 12) | (FUN << 5) | (RC))
+#define BUILD_OFormat(Op, RA, RB, FUN, RC) \
+ ((Op << 26) | (RA << 21) | (RB << 16) | (FUN << 5) | (RC))
+
+#define BUILD_LDA(RD, RS, IMM16) \
+ ((0x08 << 26) | ((RD) << 21) | ((RS) << 16) | ((IMM16) & 65535))
+#define BUILD_LDAH(RD, RS, IMM16) \
+ ((0x09 << 26) | ((RD) << 21) | ((RS) << 16) | ((IMM16) & 65535))
+
+#define BUILD_LDQ(RD, RS, IMM16) \
+ ((0x29 << 26) | ((RD) << 21) | ((RS) << 16) | ((IMM16) & 0xFFFF))
+
+#define BUILD_JMP(RD, RS, IMM16) \
+ ((0x1A << 26) | ((RD) << 21) | ((RS) << 16) | (0x00 << 14) | ((IMM16) & 0x3FFF))
+#define BUILD_JSR(RD, RS, IMM16) \
+ ((0x1A << 26) | ((RD) << 21) | ((RS) << 16) | (0x01 << 14) | ((IMM16) & 0x3FFF))
+
+#define BUILD_SLLi(RD, RS, IMM8) \
+ (BUILD_OFormatI(0x12, RS, IMM8, 0x39, RD))
+
+#define BUILD_ORi(RD, RS, IMM8) \
+ (BUILD_OFormatI(0x11, RS, IMM8, 0x20, RD))
+
+#define BUILD_OR(RD, RS, RT) \
+ (BUILD_OFormat(0x11, RS, RT, 0x20, RD))
+
+
+
+static void EmitBranchToAt(void *At, void *To) {
+ unsigned long Fn = (unsigned long)To;
+
+ unsigned *AtI = (unsigned*)At;
+
+ AtI[0] = BUILD_OR(0, 27, 27);
+
+ DOUT << "Stub targeting " << To << "\n";
+
+ for (int x = 1; x <= 8; ++x) {
+ AtI[2*x - 1] = BUILD_SLLi(27,27,8);
+ unsigned d = (Fn >> (64 - 8 * x)) & 0x00FF;
+ //DOUT << "outputing " << hex << d << dec << "\n";
+ AtI[2*x] = BUILD_ORi(27, 27, d);
+ }
+ AtI[17] = BUILD_JMP(31,27,0); //jump, preserving ra, and setting pv
+ AtI[18] = 0x00FFFFFF; //mark this as a stub
+}
+
+void AlphaJITInfo::replaceMachineCodeForFunction(void *Old, void *New) {
+ //FIXME
+ assert(0);
+}
+
+static TargetJITInfo::JITCompilerFn JITCompilerFunction;
+//static AlphaJITInfo* AlphaJTI;
+
+extern "C" {
+#ifdef __alpha
+
+ void AlphaCompilationCallbackC(long* oldpv, void* CameFromStub)
+ {
+ void* Target = JITCompilerFunction(CameFromStub);
+
+ //rewrite the stub to an unconditional branch
+ if (((unsigned*)CameFromStub)[18] == 0x00FFFFFF) {
+ DOUT << "Came from a stub, rewriting\n";
+ EmitBranchToAt(CameFromStub, Target);
+ } else {
+ DOUT << "confused, didn't come from stub at " << CameFromStub
+ << " old jump vector " << oldpv
+ << " new jump vector " << Target << "\n";
+ }
+
+ //Change pv to new Target
+ *oldpv = (long)Target;
+ }
+
+ void AlphaCompilationCallback(void);
+
+ asm(
+ ".text\n"
+ ".globl AlphaComilationCallbackC\n"
+ ".align 4\n"
+ ".globl AlphaCompilationCallback\n"
+ ".ent AlphaCompilationCallback\n"
+"AlphaCompilationCallback:\n"
+ // //get JIT's GOT
+ "ldgp $29, 0($27)\n"
+ //Save args, callee saved, and perhaps others?
+ //args: $16-$21 $f16-$f21 (12)
+ //callee: $9-$14 $f2-$f9 (14)
+ //others: fp:$15 ra:$26 pv:$27 (3)
+ "lda $30, -232($30)\n"
+ "stq $16, 0($30)\n"
+ "stq $17, 8($30)\n"
+ "stq $18, 16($30)\n"
+ "stq $19, 24($30)\n"
+ "stq $20, 32($30)\n"
+ "stq $21, 40($30)\n"
+ "stt $f16, 48($30)\n"
+ "stt $f17, 56($30)\n"
+ "stt $f18, 64($30)\n"
+ "stt $f19, 72($30)\n"
+ "stt $f20, 80($30)\n"
+ "stt $f21, 88($30)\n"
+ "stq $9, 96($30)\n"
+ "stq $10, 104($30)\n"
+ "stq $11, 112($30)\n"
+ "stq $12, 120($30)\n"
+ "stq $13, 128($30)\n"
+ "stq $14, 136($30)\n"
+ "stt $f2, 144($30)\n"
+ "stt $f3, 152($30)\n"
+ "stt $f4, 160($30)\n"
+ "stt $f5, 168($30)\n"
+ "stt $f6, 176($30)\n"
+ "stt $f7, 184($30)\n"
+ "stt $f8, 192($30)\n"
+ "stt $f9, 200($30)\n"
+ "stq $15, 208($30)\n"
+ "stq $26, 216($30)\n"
+ "stq $27, 224($30)\n"
+
+ "addq $30, 224, $16\n" //pass the addr of saved pv as the first arg
+ "bis $0, $0, $17\n" //pass the roughly stub addr in second arg
+ "jsr $26, AlphaCompilationCallbackC\n" //call without saving ra
+
+ "ldq $16, 0($30)\n"
+ "ldq $17, 8($30)\n"
+ "ldq $18, 16($30)\n"
+ "ldq $19, 24($30)\n"
+ "ldq $20, 32($30)\n"
+ "ldq $21, 40($30)\n"
+ "ldt $f16, 48($30)\n"
+ "ldt $f17, 56($30)\n"
+ "ldt $f18, 64($30)\n"
+ "ldt $f19, 72($30)\n"
+ "ldt $f20, 80($30)\n"
+ "ldt $f21, 88($30)\n"
+ "ldq $9, 96($30)\n"
+ "ldq $10, 104($30)\n"
+ "ldq $11, 112($30)\n"
+ "ldq $12, 120($30)\n"
+ "ldq $13, 128($30)\n"
+ "ldq $14, 136($30)\n"
+ "ldt $f2, 144($30)\n"
+ "ldt $f3, 152($30)\n"
+ "ldt $f4, 160($30)\n"
+ "ldt $f5, 168($30)\n"
+ "ldt $f6, 176($30)\n"
+ "ldt $f7, 184($30)\n"
+ "ldt $f8, 192($30)\n"
+ "ldt $f9, 200($30)\n"
+ "ldq $15, 208($30)\n"
+ "ldq $26, 216($30)\n"
+ "ldq $27, 224($30)\n" //this was updated in the callback with the target
+
+ "lda $30, 232($30)\n" //restore sp
+ "jmp $31, ($27)\n" //jump to the new function
+ ".end AlphaCompilationCallback\n"
+ );
+#else
+ void AlphaCompilationCallback() {
+ cerr << "Cannot call AlphaCompilationCallback() on a non-Alpha arch!\n";
+ abort();
+ }
+#endif
+}
+
+void *AlphaJITInfo::emitFunctionStub(void *Fn, MachineCodeEmitter &MCE) {
+ //assert(Fn == AlphaCompilationCallback && "Where are you going?\n");
+ //Do things in a stupid slow way!
+ MCE.startFunctionStub(19*4);
+ void* Addr = (void*)(intptr_t)MCE.getCurrentPCValue();
+ for (int x = 0; x < 19; ++ x)
+ MCE.emitWordLE(0);
+ EmitBranchToAt(Addr, Fn);
+ DOUT << "Emitting Stub to " << Fn << " at [" << Addr << "]\n";
+ return MCE.finishFunctionStub(0);
+}
+
+TargetJITInfo::LazyResolverFn
+AlphaJITInfo::getLazyResolverFunction(JITCompilerFn F) {
+ JITCompilerFunction = F;
+ // setZerothGOTEntry((void*)AlphaCompilationCallback);
+ return AlphaCompilationCallback;
+}
+
+//These describe LDAx
+static const int IMM_LOW = -32768;
+static const int IMM_HIGH = 32767;
+static const int IMM_MULT = 65536;
+
+static long getUpper16(long l)
+{
+ long y = l / IMM_MULT;
+ if (l % IMM_MULT > IMM_HIGH)
+ ++y;
+ if (l % IMM_MULT < IMM_LOW)
+ --y;
+ assert((short)y == y && "displacement out of range");
+ return y;
+}
+
+static long getLower16(long l)
+{
+ long h = getUpper16(l);
+ long y = l - h * IMM_MULT;
+ assert(y == (short)y && "Displacement out of range");
+ return y;
+}
+
+void AlphaJITInfo::relocate(void *Function, MachineRelocation *MR,
+ unsigned NumRelocs, unsigned char* GOTBase) {
+ //because gpdist are paired and relative to the pc of the first inst,
+ //we need to have some state
+
+ static std::map<std::pair<void*, int>, void*> gpdistmap;
+
+ for (unsigned i = 0; i != NumRelocs; ++i, ++MR) {
+ unsigned *RelocPos = (unsigned*)Function + MR->getMachineCodeOffset()/4;
+ long idx = 0;
+ bool doCommon = true;
+ switch ((Alpha::RelocationType)MR->getRelocationType()) {
+ default: assert(0 && "Unknown relocation type!");
+ case Alpha::reloc_literal:
+ //This is a LDQl
+ idx = MR->getGOTIndex();
+ DOUT << "Literal relocation to slot " << idx;
+ idx = (idx - GOToffset) * 8;
+ DOUT << " offset " << idx << "\n";
+ break;
+ case Alpha::reloc_gprellow:
+ idx = (unsigned char*)MR->getResultPointer() - &GOTBase[GOToffset * 8];
+ idx = getLower16(idx);
+ DOUT << "gprellow relocation offset " << idx << "\n";
+ DOUT << " Pointer is " << (void*)MR->getResultPointer()
+ << " GOT is " << (void*)&GOTBase[GOToffset * 8] << "\n";
+ break;
+ case Alpha::reloc_gprelhigh:
+ idx = (unsigned char*)MR->getResultPointer() - &GOTBase[GOToffset * 8];
+ idx = getUpper16(idx);
+ DOUT << "gprelhigh relocation offset " << idx << "\n";
+ DOUT << " Pointer is " << (void*)MR->getResultPointer()
+ << " GOT is " << (void*)&GOTBase[GOToffset * 8] << "\n";
+ break;
+ case Alpha::reloc_gpdist:
+ switch (*RelocPos >> 26) {
+ case 0x09: //LDAH
+ idx = &GOTBase[GOToffset * 8] - (unsigned char*)RelocPos;
+ idx = getUpper16(idx);
+ DOUT << "LDAH: " << idx << "\n";
+ //add the relocation to the map
+ gpdistmap[std::make_pair(Function, MR->getConstantVal())] = RelocPos;
+ break;
+ case 0x08: //LDA
+ assert(gpdistmap[std::make_pair(Function, MR->getConstantVal())] &&
+ "LDAg without seeing LDAHg");
+ idx = &GOTBase[GOToffset * 8] -
+ (unsigned char*)gpdistmap[std::make_pair(Function, MR->getConstantVal())];
+ idx = getLower16(idx);
+ DOUT << "LDA: " << idx << "\n";
+ break;
+ default:
+ assert(0 && "Cannot handle gpdist yet");
+ }
+ break;
+ case Alpha::reloc_bsr: {
+ idx = (((unsigned char*)MR->getResultPointer() -
+ (unsigned char*)RelocPos) >> 2) + 1; //skip first 2 inst of fun
+ *RelocPos |= (idx & ((1 << 21)-1));
+ doCommon = false;
+ break;
+ }
+ }
+ if (doCommon) {
+ short x = (short)idx;
+ assert(x == idx);
+ *(short*)RelocPos = x;
+ }
+ }
+}