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- removed marked code for how to create GDB/LLDB debug info as it will probably never be implemented

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This commit is contained in:
Magnus Norddahl 2018-12-19 00:49:43 +01:00
parent 34007a8d27
commit 650e6a9c1b
1 changed files with 0 additions and 46 deletions
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46
src/scripting/vm/jit_runtime.cpp
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@ -314,52 +314,6 @@ extern "C"
{
void __register_frame(const void*);
void __deregister_frame(const void*);
#if 0 // Someone needs to implement this if GDB/LLDB should produce correct call stacks
// GDB JIT interface (GG guys! Thank you SO MUCH for not hooking into the above functions. Really appreciate it!)
// To register code with GDB, the JIT should follow this protocol:
//
// * Generate an object file in memory with symbols and other desired debug information.
// The file must include the virtual addresses of the sections.
// * Create a code entry for the file, which gives the start and size of the symbol file.
// * Add it to the linked list in the JIT descriptor.
// * Point the relevant_entry field of the descriptor at the entry.
// * Set action_flag to JIT_REGISTER and call __jit_debug_register_code.
// Pure beauty! Now a JIT also has to create a full ELF object file. And is it a MACH-O on macOS? You guys ROCK!
typedef enum
{
JIT_NOACTION = 0,
JIT_REGISTER_FN,
JIT_UNREGISTER_FN
} jit_actions_t;
struct jit_code_entry
{
struct jit_code_entry *next_entry;
struct jit_code_entry *prev_entry;
const char *symfile_addr;
uint64_t symfile_size;
};
struct jit_descriptor
{
uint32_t version;
// This type should be jit_actions_t, but we use uint32_t to be explicit about the bitwidth.
uint32_t action_flag;
struct jit_code_entry *relevant_entry;
struct jit_code_entry *first_entry;
};
// GDB puts a breakpoint in this function.
void __attribute__((noinline)) __jit_debug_register_code() { };
// Make sure to specify the version statically, because the debugger may check the version before we can set it.
struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 };
#endif
}
static void WriteLength(TArray<uint8_t> &stream, unsigned int pos, unsigned int v)