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- create a very basic OP_IJMP implementation

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This commit is contained in:
Magnus Norddahl 2018-09-17 21:52:21 +02:00 committed by drfrag
parent 812a4290b1
commit e0f0511d29
2 changed files with 21 additions and 6 deletions
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5
src/scripting/vm/jit.cpp
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@ -144,11 +144,6 @@ bool JitCompiler::CanJit(VMScriptFunction *sfunc)
int size = sfunc->CodeSize;
for (int i = 0; i < size; i++)
{
// Functions not implemented at all yet:
if (sfunc->Code[i].op == OP_IJMP)
return false;
// Partially implemented functions:
auto pc = sfunc->Code + i;

22
src/scripting/vm/jit_flow.cpp
View file

@ -25,7 +25,27 @@ void JitCompiler::EmitJMP()
void JitCompiler::EmitIJMP()
{
I_FatalError("EmitIJMP not implemented\n");
// This uses the whole function as potential jump targets. Can the range be reduced?
int i = (int)(ptrdiff_t)(pc - sfunc->Code);
auto val = cc.newInt32();
cc.mov(val, regD[A]);
cc.add(val, i + (int)BCs + 1);
int size = sfunc->CodeSize;
for (i = 0; i < size; i++)
{
if (sfunc->Code[i].op == OP_JMP)
{
int target = i + JMPOFS(&sfunc->Code[i]) + 1;
cc.cmp(val, i);
cc.je(labels[target]);
}
}
// This should never happen. It means we are jumping to something that is not a JMP instruction!
EmitThrowException(X_OTHER);
}
void JitCompiler::EmitVTBL()