6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-02 07:11:49 +00:00
Code Issues Projects Releases Wiki Activity

Implement branches

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4988 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-12-13 05:40:28 +00:00
parent 8b88e8f298
commit 4c95e56743
2 changed files with 32 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
tools/jello/Emitter.cpp
View File

@ -8,6 +8,7 @@
#include "VM.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/Function.h"
namespace {
class Emitter : public MachineCodeEmitter {
@ -15,12 +16,15 @@ namespace {
unsigned char *CurBlock;
unsigned char *CurByte;
std::vector<std::pair<BasicBlock*, unsigned *> > BBRefs;
std::map<BasicBlock*, unsigned> BBLocations;
public:
Emitter(VM &vm) : TheVM(vm) {}
virtual void startFunction(MachineFunction &F);
virtual void finishFunction(MachineFunction &F);
virtual void startBasicBlock(MachineBasicBlock &BB) {}
virtual void startBasicBlock(MachineBasicBlock &BB);
virtual void emitByte(unsigned char B);
virtual void emitPCRelativeDisp(Value *V);
virtual void emitGlobalAddress(GlobalValue *V);
@ -48,15 +52,23 @@ void Emitter::startFunction(MachineFunction &F) {
TheVM.addGlobalMapping(F.getFunction(), CurBlock);
}
#include <iostream>
#include "llvm/Function.h"
void Emitter::finishFunction(MachineFunction &F) {
for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
unsigned Location = BBLocations[BBRefs[i].first];
unsigned *Ref = BBRefs[i].second;
*Ref = Location-(unsigned)Ref-4;
}
BBRefs.clear();
BBLocations.clear();
std::cerr << "Finished Code Generation of Function: "
<< F.getFunction()->getName() << ": " << CurByte-CurBlock
<< " bytes of text\n";
}
void Emitter::startBasicBlock(MachineBasicBlock &BB) {
BBLocations[BB.getBasicBlock()] = (unsigned)CurByte;
}
void Emitter::emitByte(unsigned char B) {
@ -64,16 +76,24 @@ void Emitter::emitByte(unsigned char B) {
}
// emitPCRelativeDisp - Just output a displacement that will cause a reference
// to the zero page, which will cause a seg-fault, causing things to get
// resolved on demand. Keep track of these markers.
// emitPCRelativeDisp - For functions, just output a displacement that will
// cause a reference to the zero page, which will cause a seg-fault, causing
// things to get resolved on demand. Keep track of these markers.
//
// For basic block references, keep track of where the references are so they
// may be patched up when the basic block is defined.
//
void Emitter::emitPCRelativeDisp(Value *V) {
TheVM.addFunctionRef(CurByte, cast<Function>(V));
unsigned ZeroAddr = -(unsigned)CurByte-4; // Calculate displacement to null
*(unsigned*)CurByte = ZeroAddr; // 4 byte offset
CurByte += 4;
if (Function *F = dyn_cast<Function>(V)) {
TheVM.addFunctionRef(CurByte, F);
unsigned ZeroAddr = -(unsigned)CurByte-4; // Calculate displacement to null
*(unsigned*)CurByte = ZeroAddr; // 4 byte offset
CurByte += 4;
} else {
BasicBlock *BB = cast<BasicBlock>(V); // Keep track of reference...
BBRefs.push_back(std::make_pair(BB, (unsigned*)CurByte));
CurByte += 4;
}
}
void Emitter::emitGlobalAddress(GlobalValue *V) {

1
tools/jello/VM.cpp
View File

@ -9,7 +9,6 @@
#include "llvm/Target/TargetMachine.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/Function.h"
#include <iostream>
#include <dlfcn.h> // dlsym access