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Deoptimize on side-exit

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Maxime Chevalier-Boisvert 2020-11-09 16:54:29 -05:00 • committed by Alan Wu
parent 64072dd3a6
commit 1cd4c8b294
1 changed files with 16 additions and 5 deletions
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21
ujit_compile.c
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@ -113,7 +113,7 @@ struct compiled_region_array {
const rb_iseq_t *iseq;
size_t start_idx;
uint8_t *code;
}data[];
} data[];
};
// Add an element to a region array, or allocate a new region array.
@ -346,14 +346,25 @@ ujit_side_exit(codeblock_t* cb, ctx_t* ctx, VALUE* exit_pc)
{
uint8_t* code_ptr = cb_get_ptr(cb, cb->write_pos);
// Table mapping opcodes to interpreter handlers
const void * const *table = rb_vm_get_insns_address_table();
// Write back the old instruction at the entry PC
// To deotimize the code block this instruction belongs to
VALUE* entry_pc = &ctx->iseq->body->iseq_encoded[ctx->start_idx];
int entry_opcode = opcode_at_pc(ctx->iseq, entry_pc);
void* entry_instr = (void*)table[entry_opcode];
mov(cb, RAX, const_ptr_opnd(entry_pc));
mov(cb, RCX, const_ptr_opnd(entry_instr));
mov(cb, mem_opnd(64, RAX, 0), RCX);
// Write back the old instruction at the exit PC
// Otherwise the interpreter may jump right back to the
// JITted code we're trying to exit
const void * const *table = rb_vm_get_insns_address_table();
int opcode = opcode_at_pc(ctx->iseq, exit_pc);
void* old_instr = (void*)table[opcode];
int exit_opcode = opcode_at_pc(ctx->iseq, exit_pc);
void* exit_instr = (void*)table[exit_opcode];
mov(cb, RAX, const_ptr_opnd(exit_pc));
mov(cb, RCX, const_ptr_opnd(old_instr));
mov(cb, RCX, const_ptr_opnd(exit_instr));
mov(cb, mem_opnd(64, RAX, 0), RCX);
// Generate the code to exit to the interpreters