fix: bad immediates analysis

the commit 361fd0a generates some bad code, especially in the test
switch.bin. The information "(rax*8)" in the jumptable was lost.

Author: plasma-disassembler

plasma/lib/analyzer.py

@@ -281,7 +281,7 @@ def add_stack_variable(self, func_obj, inst, offset, op_size):
     # -> inst op, imm
     def analyze_imm(self, i, op, imm, is_written_op, is_deref_pointer):
         ret = self.__analyze_imm(i, op, imm, is_written_op, is_deref_pointer)
-        if ret and op.type != self.ARCH_UTILS.OP_IMM:
+        if is_written_op and ret and op.type != self.ARCH_UTILS.OP_IMM:
             self.db.immediates[i.address] = imm
 
 

tests/analyzer/arrays.rev

@@ -183,17 +183,17 @@ int        var_c     = -0xc
 0x40053a: rsp -= 48
 0x40053e: var_2c = edi
 0x400541: var_38 = rsi
-0x400545: !eax = &global_array[0]
+0x400545: eax = *(&global_array[0])
 0x40054b: var_c = eax
-0x40054e: !eax = &global_array[5]
+0x40054e: eax = *(&global_array[5])
 0x400554: var_10 = eax
-0x400557: !eax = &global_array[9]
+0x400557: eax = *(&global_array[9])
 0x40055d: var_14 = eax
-0x400560: !eax = &global_string[7] " a string.\n"
+0x400560: eax = (zero ext) *(&global_string[7] " a string.\n")
 0x400567: var_15 = al
-0x40056a: !rax = &global_ptr[0]
+0x40056a: rax = *(&global_ptr[0])
 0x400571: var_20 = rax
-0x400575: !eax = &global_array[8]
+0x400575: eax = *(&global_array[8])
 0x40057b: esi = eax
 0x40057d: edi = asc_400634 "%d\n"
 0x400582: eax = 0
@@ -226,9 +226,9 @@ frame_size = 56
 0x4005b4: r15d = edi
 0x4005b7: push r13
 0x4005b9: push r12
-0x4005bb: !r12 = __init_array_start
+0x4005bb: r12 = __init_array_start
 0x4005c2: push rbp
-0x4005c3: !rbp = __init_array_end
+0x4005c3: rbp = __init_array_end
 0x4005ca: push rbx
 0x4005cb: r14 = rsi
 0x4005ce: r13 = rdx

tests/analyzer/invert_cond.rev

@@ -17,21 +17,21 @@ function main (.text) {
             # 0x6fa: cmp dword ptr [rbp - 4], 2
             # 0x6fe: je 0x70e
             if (var_c != 2) {
-                0x700: !rdi = qword_7e4
+                0x700: rdi = qword_7e4
                 0x707: call puts
                 0x70c: jmp ret_0x736
             } else {
-                0x70e: !rdi = unk_7e6 "2"
+                0x70e: rdi = unk_7e6 "2"
                 0x715: call puts
                 0x71a: jmp ret_0x736
             }
         } else {
-            0x71c: !rdi = qword_7e8
+            0x71c: rdi = qword_7e8
             0x723: call puts
             0x728: jmp ret_0x736
         }
     } else {
-        0x72a: !rdi = unk_7ea "4"
+        0x72a: rdi = unk_7ea "4"
         0x731: call puts
     }
     ret_0x736:
@@ -54,14 +54,14 @@ function func1 (.text) {
     # 0x692: cmp dword ptr [rbp - 4], 4
     # 0x696: jg 0x6ae
     if (var_c <= 4) {
-        0x698: !rdi = qword_7e4
+        0x698: rdi = qword_7e4
         0x69f: call puts
         0x6a4: edi = 0
         0x6a9: call exit
     }
 
     ret_0x6ae:
-    0x6ae: !rdi = unk_7e6 "2"
+    0x6ae: rdi = unk_7e6 "2"
     0x6b5: call puts
     0x6ba: nop
     0x6bb: leave
@@ -78,11 +78,11 @@ function func2 (.text) {
     # 0x6c5: cmp dword ptr [rbp - 4], 4
     # 0x6c9: jg 0x6d7
     if (var_c <= 4) {
-        0x6cb: !rdi = qword_7e4
+        0x6cb: rdi = qword_7e4
         0x6d2: call puts
     }
     ret_0x6d7:
-    0x6d7: !rdi = unk_7e6 "2"
+    0x6d7: rdi = unk_7e6 "2"
     0x6de: call puts
     0x6e3: nop
     0x6e4: leave
@@ -101,24 +101,24 @@ function main (.text) {
     # 0x6ee: cmp dword ptr [rbp - 0xc], 0
     # 0x6f2: je 0x72a ; manually inverted
     if (var_14 == 0) {
-        0x72a: !rdi = unk_7ea "4"
+        0x72a: rdi = unk_7ea "4"
         0x731: call puts
     }
     # 0x6f4: cmp dword ptr [rbp - 8], 1
     # 0x6f8: je 0x71c ; manually inverted
     else if (var_10 == 1) {
-        0x71c: !rdi = qword_7e8
+        0x71c: rdi = qword_7e8
         0x723: call puts
         0x728: jmp ret_0x736
     }
     # 0x6fa: cmp dword ptr [rbp - 4], 2
     # 0x6fe: je 0x70e ; manually inverted
     else if (var_c == 2) {
-        0x70e: !rdi = unk_7e6 "2"
+        0x70e: rdi = unk_7e6 "2"
         0x715: call puts
         0x71a: jmp ret_0x736
     } else {
-        0x700: !rdi = qword_7e4
+        0x700: rdi = qword_7e4
         0x707: call puts
         0x70c: jmp ret_0x736
     }
@@ -143,13 +143,13 @@ function func1 (.text) {
     # 0x696: jg 0x6ae ; manually inverted
     if (var_c > 4) {
         ret_0x6ae:
-        0x6ae: !rdi = unk_7e6 "2"
+        0x6ae: rdi = unk_7e6 "2"
         0x6b5: call puts
         0x6ba: nop
         0x6bb: leave
         0x6bc: ret
     }
-    0x698: !rdi = qword_7e4
+    0x698: rdi = qword_7e4
     0x69f: call puts
     0x6a4: edi = 0
     0x6a9: call exit
@@ -165,11 +165,11 @@ function func2 (.text) {
     # 0x6c5: cmp dword ptr [rbp - 4], 4
     # 0x6c9: jg 0x6d7 ; manually inverted
     if (var_c <= 4) {
-        0x6cb: !rdi = qword_7e4
+        0x6cb: rdi = qword_7e4
         0x6d2: call puts
     }
     ret_0x6d7:
-    0x6d7: !rdi = unk_7e6 "2"
+    0x6d7: rdi = unk_7e6 "2"
     0x6de: call puts
     0x6e3: nop
     0x6e4: leave

tests/analyzer/switch.rev

@@ -242,9 +242,9 @@ frame_size = 56
 0x400584: r15d = edi
 0x400587: push r13
 0x400589: push r12
-0x40058b: !r12 = __init_array_start
+0x40058b: r12 = __init_array_start
 0x400592: push rbp
-0x400593: !rbp = __init_array_end
+0x400593: rbp = __init_array_end
 0x40059a: push rbx
 0x40059b: r14 = rsi
 0x40059e: r13 = rdx