Enable AOT linux perf support (#2930)

And refactor the original perf support
- use WAMR_BUILD_LINUX_PERF as the cmake compilation control
- use WASM_ENABLE_LINUX_PERF as the compiler macro
- use `wamrc --enable-linux-perf` to generate aot file which contains fp operations
- use `iwasm --enable-linux-perf` to create perf map for `perf record`

core/iwasm/aot/aot_loader.c

@@ -2764,6 +2764,104 @@ fail:
     return ret;
 }
 
+#if WASM_ENABLE_LINUX_PERF != 0
+struct func_info {
+    uint32 idx;
+    void *ptr;
+};
+
+static uint32
+get_func_size(const AOTModule *module, struct func_info *sorted_func_ptrs,
+              uint32 idx)
+{
+    uint32 func_sz;
+
+    if (idx == module->func_count - 1)
+        func_sz = (uintptr_t)module->code + module->code_size
+                  - (uintptr_t)(sorted_func_ptrs[idx].ptr);
+    else
+        func_sz = (uintptr_t)(sorted_func_ptrs[idx + 1].ptr)
+                  - (uintptr_t)(sorted_func_ptrs[idx].ptr);
+
+    return func_sz;
+}
+
+static int
+compare_func_ptrs(const void *f1, const void *f2)
+{
+    return (intptr_t)((struct func_info *)f1)->ptr
+           - (intptr_t)((struct func_info *)f2)->ptr;
+}
+
+static struct func_info *
+sort_func_ptrs(const AOTModule *module, char *error_buf, uint32 error_buf_size)
+{
+    uint64 content_len;
+    struct func_info *sorted_func_ptrs;
+    unsigned i;
+
+    content_len = (uint64)sizeof(struct func_info) * module->func_count;
+    sorted_func_ptrs = loader_malloc(content_len, error_buf, error_buf_size);
+    if (!sorted_func_ptrs)
+        return NULL;
+
+    for (i = 0; i < module->func_count; i++) {
+        sorted_func_ptrs[i].idx = i;
+        sorted_func_ptrs[i].ptr = module->func_ptrs[i];
+    }
+
+    qsort(sorted_func_ptrs, module->func_count, sizeof(struct func_info),
+          compare_func_ptrs);
+
+    return sorted_func_ptrs;
+}
+
+static bool
+create_perf_map(const AOTModule *module, char *error_buf, uint32 error_buf_size)
+{
+    struct func_info *sorted_func_ptrs = NULL;
+    char perf_map_info[128] = { 0 };
+    FILE *perf_map = NULL;
+    uint32 i;
+    pid_t pid = getpid();
+    bool ret = false;
+
+    sorted_func_ptrs = sort_func_ptrs(module, error_buf, error_buf_size);
+    if (!sorted_func_ptrs)
+        goto quit;
+
+    snprintf(perf_map_info, 128, "/tmp/perf-%d.map", pid);
+    perf_map = fopen(perf_map_info, "w");
+    if (!perf_map) {
+        LOG_WARNING("warning: can't create /tmp/perf-%d.map, because %s", pid,
+                    strerror(errno));
+        goto quit;
+    }
+
+    for (i = 0; i < module->func_count; i++) {
+        memset(perf_map_info, 0, 128);
+        snprintf(perf_map_info, 128, "%lx  %x  aot_func#%u\n",
+                 (uintptr_t)sorted_func_ptrs[i].ptr,
+                 get_func_size(module, sorted_func_ptrs, i),
+                 sorted_func_ptrs[i].idx);
+
+        fwrite(perf_map_info, 1, strlen(perf_map_info), perf_map);
+    }
+
+    LOG_VERBOSE("generate /tmp/perf-%d.map", pid);
+    ret = true;
+
+quit:
+    if (sorted_func_ptrs)
+        free(sorted_func_ptrs);
+
+    if (perf_map)
+        fclose(perf_map);
+
+    return ret;
+}
+#endif /* WASM_ENABLE_LINUX_PERF != 0*/
+
 static bool
 load_from_sections(AOTModule *module, AOTSection *sections,
                    bool is_load_from_file_buf, char *error_buf,
@@ -3224,6 +3322,12 @@ load(const uint8 *buf, uint32 size, AOTModule *module, char *error_buf,
     }
 #endif
 
+#if WASM_ENABLE_LINUX_PERF != 0
+    if (wasm_runtime_get_linux_perf())
+        if (!create_perf_map(module, error_buf, error_buf_size))
+            goto fail;
+#endif
+
     return ret;
 fail:
     return false;