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rough sketch of lookupswitch and tableswitch instructions

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This commit is contained in:
Joel Dice 2007-10-22 08:14:05 -06:00
parent 64acabf130
commit f4dfc889fd
1 changed files with 73 additions and 0 deletions
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73
src/compile.cpp
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@ -4034,6 +4034,50 @@ class JavaCompiler: public Compiler {
} }
break; break;
// todo:
// case lookupswitch: {
// int32_t base = ip - 1;
// ip += 3;
// ip -= (ip % 4);
// int32_t default_ = codeReadInt32(t, code, ip);
// int32_t pairCount = codeReadInt32(t, code, ip);
// popInt(rax);
// mov(LookupTable(this, base, pairCount, code, ip), rbx);
// mov(pairCount, rcx);
// jmp(test);
// loop.mark();
// // tbc
// test.mark();
// cmp(0, rcx);
// jne(loop);
// int32_t key = popInt(t);
// int32_t bottom = 0;
// int32_t top = pairCount;
// for (int32_t span = top - bottom; span; span = top - bottom) {
// int32_t middle = bottom + (span / 2);
// unsigned index = ip + (middle * 8);
// int32_t k = codeReadInt32(t, code, index);
// if (key < k) {
// top = middle;
// } else if (key > k) {
// bottom = middle + 1;
// } else {
// ip = base + codeReadInt32(t, code, index);
// break;
// }
// }
// ip = base + default_;
// } break;
case lrem: case lrem:
if (BytesPerWord == 8) { if (BytesPerWord == 8) {
popLong(rcx); popLong(rcx);
@ -4388,6 +4432,34 @@ class JavaCompiler: public Compiler {
pushInt(static_cast<int16_t>(codeReadInt16(t, code, ip))); pushInt(static_cast<int16_t>(codeReadInt16(t, code, ip)));
} break; } break;
// todo:
// case tableswitch: {
// int32_t base = ip - 1;
// ip += 3;
// ip -= (ip % 4);
// int32_t default_ = codeReadInt32(t, code, ip);
// int32_t bottom = codeReadInt32(t, code, ip);
// int32_t top = codeReadInt32(t, code, ip);
// popInt(rax);
// cmp(bottom, rax);
// jl(defaultLabel);
// cmp(top, rax);
// jg(defaultLabel);
// sub(bottom, rax);
// mov(Address(NoRegister, rax, 4,
// IndexTable(this, base, top - bottom, code, ip)),
// rax);
// jmp(rax);
// defaultLabel.mark();
// jmp(base + default_);
// stackMapper.jumped(base + default_);
// } break;
default: default:
abort(t); abort(t);
} }
@ -4526,6 +4598,7 @@ compileMethod2(MyThread* t, object method)
compiledCode(code) + compiledCodeLength(code)); compiledCode(code) + compiledCodeLength(code));
} }
// for debugging:
if (false and if (false and
strcmp(reinterpret_cast<const char*> strcmp(reinterpret_cast<const char*>
(&byteArrayBody(t, className(t, methodClass(t, method)), 0)), (&byteArrayBody(t, className(t, methodClass(t, method)), 0)),