Prepare for better DIE parsing (broken)

build.sh

@@ -39,7 +39,7 @@ elif [[ $1 = "tests" ]]; then
 elif [[ $1 = "clean" ]]; then
 	rm build/*
 else
-	echo "No such target '$1'"
+	echo "No such target '$1'. Try one of: [empty], examples, tests, clean"
 fi
 
 echo "Leaving project directory"

src/command.c

@@ -155,8 +155,6 @@ command_print(struct mi_process proc, char *name, int name_length)
         u64 address = cfa + variable->location;
         u64 raw_value = ptrace(PTRACE_PEEKDATA, proc.pid, address, NULL);
         
-        printf("\"%s\", %ld\n", type.name, variable->location);
-        
         u8  raw_value1;
         u16 raw_value2;
         u32 raw_value4;

src/common.h

@@ -1,3 +1,5 @@
+#define _GNU_SOURCE
+
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
@@ -10,14 +12,14 @@
 #include <assert.h>
 #include <fcntl.h>
 
-#include <sys/uio.h>
 #include <sys/types.h>
 #include <sys/user.h>
 #include <sys/ptrace.h>
 #include <sys/wait.h>
 #include <sys/stat.h>
-#include <sys/mman.h>
-#include <sys/personality.h>
+#include <sys/mman.h>        // mmap, munmap
+#include <sys/personality.h> // syscall(SYS_personality, ADDR_NO_RANDOMIZE)
+#include <sys/uio.h>         // process_vm_readv
 
 typedef uint8_t  u8;
 typedef uint16_t u16;
@@ -42,6 +44,12 @@ enum mi_type_encoding {
     MI_UNSIGNED
 };
 
+enum mi_type_decorator {
+    MI_POINTER = 0x01,
+    MI_CONST = 0x02,
+    MI_RESTRICT = 0x04,
+};
+
 struct mi_buffer {
     u8 *data;
     u64 size;
@@ -64,6 +72,11 @@ struct mi_type {
     char *name;
     int size;
     enum mi_type_encoding encoding;
+    u32 flags;
+    
+    // For structures
+    u32 children_from;
+    u32 children_count;
     
     // used during parsing so that variables (which only have offsets) could find their
     // corresponding parsed type record

src/dwarf.c

@@ -777,6 +777,8 @@ read_debug_info_for_compilation_unit(u8 *file, struct mi_debuginfo *dest,
     struct mi_variable *variable = dest->variables + dest->var_count;
     struct mi_type     *type = dest->types + dest->type_count;
     
+    struct mi_type *parent_type = 0;
+    
     comp_unit->functions_from = dest->func_count;
     
     for (;;) {
@@ -804,6 +806,32 @@ read_debug_info_for_compilation_unit(u8 *file, struct mi_debuginfo *dest,
             ++depth;
         }
         
+        switch (tag) {
+            case DW_TAG_compile_unit: {
+                break;
+            }
+            
+            case DW_TAG_subprogram: {
+                break;
+            }
+            
+            case DW_TAG_variable: {
+                break;
+            }
+            
+            case DW_TAG_structure_type: {
+                break;
+            }
+            
+            case DW_TAG_member: {
+                break;
+            }
+            
+            case DW_TAG_base_type: {
+                break;
+            }
+        }
+#if 0
         u32 attribute, form;
         
         do {
@@ -838,6 +866,15 @@ read_debug_info_for_compilation_unit(u8 *file, struct mi_debuginfo *dest,
                 } else if (attribute == DW_AT_type) {
                     variable->type = value;
                 }
+            } else if (tag == DW_TAG_structure_type) {
+                type->_offset = record_offset;
+                if (attribute == DW_AT_name) {
+                    type->name = (char *) value;
+                } else if (attribute == DW_AT_byte_size) {
+                    type->size = value;
+                }
+            } else if (tag == DW_TAG_member) {
+                
             } else if (tag == DW_TAG_base_type) {
                 type->_offset = record_offset;
                 if (attribute == DW_AT_name) {
@@ -882,7 +919,7 @@ read_debug_info_for_compilation_unit(u8 *file, struct mi_debuginfo *dest,
             }
         } while (attribute != 0 || form != 0);
         
-        // NOTE(aolo2): DIE completely processed, finish it up
+        // NOTE(aolo2): DIE completely processed, finish it ??uploads??
         if (tag == DW_TAG_subprogram) {
             func->high_pc = func->low_pc + func->high_pc;
             func->variables_from = dest->var_count;
@@ -895,9 +932,17 @@ read_debug_info_for_compilation_unit(u8 *file, struct mi_debuginfo *dest,
             ++dest->var_count;
             ++variable;
         } else if (tag == DW_TAG_base_type) {
+            ++parent_type->children_count;
             ++dest->type_count;
             ++type;
+        } else if (tag == DW_TAG_structure_type) {
+            parent_type = type;
+            parent_type->children_from = dest->type_count;
+            ++type;
         }
+#endif
+        
+        
     }
     
     // Resolve types

src/util.c

@@ -326,4 +326,23 @@ get_cfa_at_pc(struct mi_process proc, u64 pc)
     regset = eh_frame_find_pc(fde, regset, pc);
     
     return(regset.cfa);
+}
+
+static void
+read_process_memory(struct mi_process proc, u64 at, u64 size)
+{
+    struct iovec local = { 0 };
+    struct iovec remote = { 0 };
+    
+    u8 *data = malloc(size);
+    
+    local.iov_base = data;
+    local.iov_len = size;
+    
+    remote.iov_base = (void *) at;
+    remote.iov_len = size;
+    
+    u64 read = process_vm_readv(proc.pid, &local, 1, &remote, 1, 0);
+    
+    assert(read == size);
 }

test/test_main.c

@@ -161,6 +161,8 @@ test_print(char *path, int steps, char *name, char *type, int location)
 int
 main(void)
 {
+    freopen("/dev/null", "wb", stdout);
+    
     DO_TEST("start 001-simple", test_start("res/001-simple"));
     DO_TEST("start 002-compilation-units", test_start("res/002-compilation-units"));
     DO_TEST("start 003-recursion", test_start("res/003-recursion"));