Add rvprof_init implementation

src/rvprof_core.c

@@ -0,0 +1,59 @@
+#include "rvprof_internal.h"
+
+void rvprof_init(const char* output_file){
+    if (g_rvprof.initialized) return;
+
+    // enable usage of cygnus hooks, disable with RVPROF_DISABLE_HOOKS env variable
+    g_rvprof.config.enable_hooks = 1;
+    // merge regions of same names in output, disable with RVPROF_DISABLE_MERGE env variable
+    g_rvprof.config.merge_regions =1;
+    // set output file name, auto-detected, override with RVPROF_OUTPUT env variable
+    g_rvprof.config.output_filename = NULL;
+    // set program name, auto-detected
+    g_rvprof.config.program_name = NULL;
+
+    char* disable_hooks = getenv("RVPROF_DISABLE_HOOKS");
+    if (disable_hooks && strcmp(disable_hooks, "1") == 0){
+        g_rvprof.config.enable_hooks = 0;
+    }
+
+    char* disable_merge = getenv("RVPROF_DISABLE_MERGE");
+    if (disable_merge && strcmp(disable_merge, "1") == 0){
+        g_rvprof.config.merge_regions = 0;
+    }
+
+    char* env_output = getenv("RVPROF_OUTPUT");
+    const char* filename;
+
+    // determine output filename
+    if (output_file && strlen(output_file) > 0){
+        filename = output_file;
+    } else if (env_output && strlen(env_output) > 0){
+        filename = env_output;
+    } else {
+        filename = rvprof_utils_generate_output_filename();
+    }
+
+    g_rvprof.output_file = fopen(filename, "w");
+    if(!g_rvprof.output_file) return;
+
+    rvprof_error_t timing_result = rvprof_timing_init();
+    if (timing_result != RVPROF_SUCCESS) return;
+
+    rvprof_symbols_init(g_rvprof.config.program_name); // in case symbol resolution fails, just addresses are printed later
+
+
+    // rest of global state
+    g_rvprof.stack_ptr = -1;
+    g_rvprof.initialized = 1;
+    g_rvprof.auto_initialized = 0;
+    g_rvprof.total_program_time = 0;
+    g_rvprof.total_program_cycles = 0;
+    g_rvprof.total_memory_allocated = 0;
+
+
+    // initialize dynamic arrays with zeros
+    memset(&g_rvprof.regions, 0, sizeof(g_rvprof.regions));
+    memset(&g_rvprof.functions, 0, sizeof(g_rvprof.functions));
+    memset(&g_rvprof.stacks,0,sizeof(g_rvprof.stacks));
+}