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bf uses Label class

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MITSUNARI Shigeo 2018-09-04 11:41:11 +09:00
parent 613922bda3
commit 1de435ed04
1 changed files with 14 additions and 16 deletions
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30
sample/bf.cpp
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@ -10,12 +10,6 @@
#endif #endif
class Brainfuck : public Xbyak::CodeGenerator { class Brainfuck : public Xbyak::CodeGenerator {
private:
enum Direction { B, F };
std::string toStr(int labelNo, Direction dir)
{
return Xbyak::Label::toStr(labelNo) + (dir == B ? 'B' : 'F');
}
public: public:
int getContinuousChar(std::istream& is, char c) int getContinuousChar(std::istream& is, char c)
{ {
@ -67,8 +61,7 @@ public:
mov(pGetchar, rsi); // getchar mov(pGetchar, rsi); // getchar
mov(stack, rdx); // stack mov(stack, rdx); // stack
#endif #endif
int labelNo = 0; std::stack<Label> labelF, labelB;
std::stack<int> keepLabelNo;
char c; char c;
while (is >> c) { while (is >> c) {
switch (c) { switch (c) {
@ -116,17 +109,22 @@ public:
mov(cur, eax); mov(cur, eax);
break; break;
case '[': case '[':
L(toStr(labelNo, B)); {
mov(eax, cur); Label B = L();
test(eax, eax); labelB.push(B);
jz(toStr(labelNo, F), T_NEAR); mov(eax, cur);
keepLabelNo.push(labelNo++); test(eax, eax);
Label F;
jz(F, T_NEAR);
labelF.push(F);
}
break; break;
case ']': case ']':
{ {
int no = keepLabelNo.top(); keepLabelNo.pop(); Label B = labelB.top(); labelB.pop();
jmp(toStr(no, B)); jmp(B);
L(toStr(no, F)); Label F = labelF.top(); labelF.pop();
L(F);
} }
break; break;
default: default: