Showing the changes to src/vm/vm_exception_handler.cpp (1 of 40 files). Show all
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| 1 | +// | |
| 2 | +// Dis VM | |
| 3 | +// File: vm_exception_handler.cpp | |
| 4 | +// Author: arr | |
| 5 | +// | |
| 6 | + | |
| 7 | +#include <cstdint> | |
| 8 | +#include <runtime.h> | |
| 9 | +#include <vm_memory.h> | |
| 10 | +#include <exceptions.h> | |
| 11 | +#include <debug.h> | |
| 12 | + | |
| 13 | +using namespace disvm; | |
| 14 | +using namespace disvm::runtime; | |
| 15 | + | |
| 16 | +std::tuple<const handler_t *, vm_frame_t *, vm_pc_t> disvm::runtime::find_exception_handler( | |
| 17 | + const vm_stack_t &stack, | |
| 18 | + const vm_module_ref_t &faulting_module, | |
| 19 | + const vm_pc_t faulting_pc, | |
| 20 | + const vm_string_t &exception_id) | |
| 21 | +{ | |
| 22 | + auto unwind_depth = uint32_t{ 0 }; | |
| 23 | + auto current_module = &faulting_module; | |
| 24 | + auto current_pc = faulting_pc; | |
| 25 | + auto current_frame = stack.peek_frame(); | |
| 26 | + | |
| 27 | + while (current_frame != nullptr) | |
| 28 | + { | |
| 29 | + debug::log_msg(debug::component_trace_t::exception, debug::log_level_t::debug, "begin: handler: %d\n", unwind_depth); | |
| 30 | + | |
| 31 | + auto &handler_section = current_module->module->handler_section; | |
| 32 | + | |
| 33 | + for (auto &handler : handler_section) | |
| 34 | + { | |
| 35 | + // Outside pc range of this handler | |
| 36 | + if (current_pc < handler.begin_pc || handler.end_pc <= current_pc) | |
| 37 | + continue; | |
| 38 | + | |
| 39 | + // Find the appropriate exception case | |
| 40 | + for (const auto &exception : handler.exception_table) | |
| 41 | + { | |
| 42 | + auto exception_name = exception.name.get(); | |
| 43 | + if (exception_id.compare_to(exception_name) == 0) | |
| 44 | + { | |
| 45 | + debug::log_msg(debug::component_trace_t::exception, debug::log_level_t::debug, "end: handler: match: %d\n", unwind_depth); | |
| 46 | + return std::tuple<const handler_t *, vm_frame_t *, std::size_t>{ &handler, current_frame, exception.pc }; | |
| 47 | + } | |
| 48 | + else if (exception_name == nullptr && exception.pc != runtime_constants::invalid_program_counter) | |
| 49 | + { | |
| 50 | + debug::log_msg(debug::component_trace_t::exception, debug::log_level_t::debug, "end: handler: fallback: %d\n", unwind_depth); | |
| 51 | + return std::tuple<const handler_t *, vm_frame_t *, std::size_t>{ &handler, current_frame, exception.pc }; | |
| 52 | + } | |
| 53 | + } | |
| 54 | + } | |
| 55 | + | |
| 56 | + // Decrement the frame program counter. See raise instruction for details. | |
| 57 | + current_pc = static_cast<word_t>(current_frame->prev_pc() - 1); | |
| 58 | + | |
| 59 | + // Update the current module if it changes walking up the stack. | |
| 60 | + auto prev_mod_ref = current_frame->prev_module_ref(); | |
| 61 | + if (prev_mod_ref != nullptr) | |
| 62 | + current_module = prev_mod_ref; | |
| 63 | + | |
| 64 | + // Move up the stack. | |
| 65 | + current_frame = current_frame->prev_frame(); | |
| 66 | + ++unwind_depth; | |
| 67 | + } | |
| 68 | + | |
| 69 | + auto faulting_module_name = faulting_module.module->module_name->str(); | |
| 70 | + throw unhandled_user_exception{ exception_id.str(), faulting_module_name, faulting_pc }; | |
| 71 | +} | |