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bd876c243a
This change fixes some cases where YJIT fails to fire tracing events. Most of the situations YJIT did not handle correctly involves enabling tracing while running inside generated code. A new operation to invalidate all generated code is added, which uses patching to make generated code exit at the next VM instruction boundary. A new routine called `jit_prepare_routine_call()` is introduced to facilitate this and should be used when generating code that could allocate, or could otherwise use `RB_VM_LOCK_ENTER()`. The `c_return` event is fired in the middle of an instruction as opposed to at an instruction boundary, so it requires special handling. C method call return points are patched to go to a fucntion which does everything the interpreter does, including firing the `c_return` event. The generated code for C method calls normally does not fire the event. Invalided code should not change after patching so the exits are not clobbered. A new variable is introduced to track the region of code that should not change.
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
#ifndef YJIT_CODEGEN_H
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#define YJIT_CODEGEN_H 1
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#include "stddef.h"
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#include "yjit_core.h"
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// Code blocks we generate code into
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extern codeblock_t *cb;
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extern codeblock_t *ocb;
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extern uint32_t yjit_codepage_frozen_bytes;
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// Code generation state
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typedef struct JITState
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{
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// Block version being compiled
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block_t* block;
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// Instruction sequence this is associated with
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const rb_iseq_t *iseq;
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// Index of the current instruction being compiled
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uint32_t insn_idx;
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// Opcode for the instruction being compiled
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int opcode;
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// PC of the instruction being compiled
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VALUE *pc;
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// Execution context when compilation started
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// This allows us to peek at run-time values
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rb_execution_context_t* ec;
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// Whether we need to record the code address at
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// the end of this bytecode instruction for tracing suppoert
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bool record_boundary_patch_point;
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} jitstate_t;
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typedef enum codegen_status {
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YJIT_END_BLOCK,
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YJIT_KEEP_COMPILING,
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YJIT_CANT_COMPILE
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} codegen_status_t;
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// Code generation function signature
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typedef codegen_status_t (*codegen_fn)(jitstate_t* jit, ctx_t* ctx);
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uint8_t* yjit_entry_prologue(const rb_iseq_t* iseq);
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void yjit_gen_block(block_t* block, rb_execution_context_t* ec);
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void yjit_init_codegen(void);
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#endif // #ifndef YJIT_CODEGEN_H
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