void StartBBlock(BBlock bb)
{
IRInst lasti;
CurrentBB->next = bb;
bb->prev = CurrentBB;
lasti = CurrentBB->insth.prev;
if (lasti->opcode != JMP && lasti->opcode != IJMP)
{
DrawCFGEdge(CurrentBB, bb);
}
CurrentBB = bb;
}
void GenerateJump(BBlock dstBB)
{
IRInst inst;
ALLOC(inst);
dstBB->ref++;
DrawCFGEdge(CurrentBB, dstBB);
inst->ty = T(VOID);
inst->opcode = JMP;
inst->opds[0] = (Symbol)dstBB;
inst->opds[1] = inst->opds[2] = NULL;
AppendInst(inst);
}
void GenerateBranch(Type ty, BBlock dstBB, int opcode, Symbol src1, Symbol src2)
{
IRInst inst;
ALLOC(inst);
dstBB->ref++;
src1->ref++;
if (src2) src2->ref++;
DrawCFGEdge(CurrentBB, dstBB);
inst->ty = ty;
inst->opcode = opcode;
inst->opds[0] = (Symbol)dstBB;
inst->opds[1] = src1;
inst->opds[2] = src2;
AppendInst(inst);
}
/* 将bb 设置成当前块 */
void StartBBlock (BBlock bb)
{
IRInst lasti;
/* 链接到基本块 */
CurrentBB->next = bb;
bb->prev = CurrentBB;
/* 当前基本块的上一条指令 */
lasti = CurrentBB->insth.prev;
if (lasti->opcode != JMP && lasti->opcode != IJMP) {
DrawCFGEdge (CurrentBB, bb);
}
/* 改变当前块的位置 */
CurrentBB = bb;
}
void GenerateIndirectJump(BBlock *dstBBs, int len, Symbol index)
{
IRInst inst;
int i;
ALLOC(inst);
index->ref++;
for (i = 0; i < len; ++i)
{
dstBBs[i]->ref++;
DrawCFGEdge(CurrentBB, dstBBs[i]);
}
inst->ty = T(VOID);
inst->opcode = IJMP;
inst->opds[0] = (Symbol)dstBBs;
inst->opds[1] = index;
inst->opds[2] = NULL;
AppendInst(inst);
}
