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Implement shim function generation (#128)

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Wiseguy 2025-01-30 23:48:20 -05:00 committed by GitHub
parent 198de1b5cf
commit 2af6f2d161
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3 changed files with 40 additions and 0 deletions
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26
LiveRecomp/live_generator.cpp
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@ -1896,3 +1896,29 @@ bool N64Recomp::recompile_function_live(LiveGenerator& generator, const Context&
return recompile_function_custom(generator, context, function_index, output_file, static_funcs_out, tag_reference_relocs);
}
N64Recomp::ShimFunction::ShimFunction(recomp_func_ext_t* to_shim, uintptr_t value) {
sljit_compiler* compiler = sljit_create_compiler(nullptr);
// Create the function.
sljit_label* func_label = sljit_emit_label(compiler);
sljit_emit_enter(compiler, 0, SLJIT_ARGS2V(P_R, P_R), 3, 0, 0);
// Move the provided value into the third argument.
sljit_emit_op1(compiler, SLJIT_MOV, SLJIT_R2, 0, SLJIT_IMM, sljit_sw(value));
// Tail call the provided function.
sljit_emit_icall(compiler, SLJIT_CALL | SLJIT_CALL_RETURN, SLJIT_ARGS3V(P, P, W), SLJIT_IMM, sljit_sw(to_shim));
// Generate the function's code and get the address to the function.
code = sljit_generate_code(compiler, 0, nullptr);
func = reinterpret_cast<recomp_func_t*>(sljit_get_label_addr(func_label));
// Cleanup.
sljit_free_compiler(compiler);
}
N64Recomp::ShimFunction::~ShimFunction() {
sljit_free_code(code, nullptr);
code = nullptr;
func = nullptr;
}

4
include/recomp.h
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@ -439,7 +439,11 @@ gpr cop0_status_read(recomp_context* ctx);
void switch_error(const char* func, uint32_t vram, uint32_t jtbl);
void do_break(uint32_t vram);
// The function signature for all recompiler output functions.
typedef void (recomp_func_t)(uint8_t* rdram, recomp_context* ctx);
// The function signature for special functions that need a third argument.
// These get called via generated shims to allow providing some information about the caller, such as mod id.
typedef void (recomp_func_ext_t)(uint8_t* rdram, recomp_context* ctx, uintptr_t arg);
recomp_func_t* get_function(int32_t vram);

10
include/recompiler/live_recompiler.h
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@ -141,6 +141,16 @@ namespace N64Recomp {
void live_recompiler_init();
bool recompile_function_live(LiveGenerator& generator, const Context& context, size_t function_index, std::ostream& output_file, std::span<std::vector<uint32_t>> static_funcs_out, bool tag_reference_relocs);
class ShimFunction {
private:
void* code;
recomp_func_t* func;
public:
ShimFunction(recomp_func_ext_t* to_shim, uintptr_t value);
~ShimFunction();
recomp_func_t* get_func() { return func; }
};
}
#endif