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Get function addresses from llvm-compiled code

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This commit is contained in:
Lachlan Sneff
2019-02-28 12:31:39 -08:00
parent 5d77769381
commit d4ae5cdd40
7 changed files with 313 additions and 145 deletions
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27
lib/llvm-backend/cpp/object_loader.hh
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@ -1,5 +1,6 @@
#include <cstddef>
#include <cstdint>
#include <llvm/ExecutionEngine/RuntimeDyld.h>
typedef enum {
PROTECT_NONE,
@ -19,7 +20,7 @@ typedef enum {
typedef result_t (*alloc_memory_t)(size_t size, mem_protect_t protect, uint8_t** ptr_out, size_t* size_out);
typedef result_t (*protect_memory_t)(uint8_t* ptr, size_t size, mem_protect_t protect);
typedef result_t (*dealloc_memory_t)(uint8_t* ptr, size_t size);
typedef uintptr_t (*lookup_vm_symbol_t)(char* name_ptr, size_t name_size);
typedef uintptr_t (*lookup_vm_symbol_t)(char* name_ptr);
typedef struct {
/* Memory management. */
@ -30,11 +31,31 @@ typedef struct {
lookup_vm_symbol_t lookup_vm_symbol;
} callbacks_t;
class WasmModule {
public:
WasmModule(
const uint8_t *object_start,
size_t object_size,
callbacks_t *callbacks
);
void *get_func(llvm::StringRef name) const;
private:
std::unique_ptr<llvm::RuntimeDyld::MemoryManager> memory_manager;
std::unique_ptr<llvm::object::ObjectFile> object_file;
std::map<llvm::StringRef, llvm::JITEvaluatedSymbol> symbol_table;
};
extern "C" {
result_t object_load(uint8_t* mem_ptr, size_t mem_size, callbacks_t* callbacks) {
result_t object_load(const uint8_t* mem_ptr, size_t mem_size, callbacks_t* callbacks, WasmModule** module_out) {
*module_out = new WasmModule(mem_ptr, mem_size, callbacks);
return RESULT_OK;
}
void test_cpp() {
void* get_func_symbol(WasmModule* module, const char* name) {
return module->get_func(llvm::StringRef(name));
}
}