From 1dffa580e7e083a43216fd7cbcadd72c760cf29d Mon Sep 17 00:00:00 2001 From: Tom Tromey Date: Fri, 17 Aug 2018 20:34:40 -0600 Subject: [PATCH] Avoid undefined behavior in expression dumping -fsanitize=undefined pointed out undefined behavior in dump_raw_expression like: runtime error: load of value 2887952, which is not a valid value for type 'exp_opcode' dump_raw_expression will try to print the opcode for each element of the expression, even when it is not valid. To allow this, but have it avoid undefined behavior, this patch sets the underlying type of enum exp_opcode, and arranges for op_name to handle invalid opcodes more nicely. Before this patch, debug-expr.exp shows: Dump of expression @ 0x60f000007750, before conversion to prefix form: Language c, 8 elements, 16 bytes each. Index Opcode Hex Value String Value 0 OP_TYPE 89 Y............... 107820862850704 ..:..b.......... 2 OP_TYPE 89 Y............... 3 OP_VAR_VALUE 40 (............... 4 107820861806352 ..*..b.......... 5 107820861805152 `.*..b.......... 6 OP_VAR_VALUE 40 (............... 7 UNOP_MEMVAL_TYPE 57 9............... Afterward, the output is: Dump of expression @ 0x4820f90, before conversion to prefix form: Language c, 8 elements, 16 bytes each. Index Opcode Hex Value String Value 0 OP_TYPE 89 Y............... 1 unknown opcode: 176 75444400 .0.............. 2 OP_TYPE 89 Y............... 3 OP_VAR_VALUE 40 (............... 4 OP_BOOL 74616912 P.r............. 5 unknown opcode: 128 74615680 ..r............. 6 OP_VAR_VALUE 40 (............... 7 UNOP_MEMVAL_TYPE 57 9............... gdb/ChangeLog 2018-10-03 Tom Tromey * expression.h (enum exp_opcode): Use uint8_t as base type. * expprint.c (op_name): Handle invalid opcodes. --- gdb/ChangeLog | 5 +++++ gdb/expprint.c | 7 +++++++ gdb/expression.h | 2 +- 3 files changed, 13 insertions(+), 1 deletion(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 1a3cc6c30a2..8fd128ac6fe 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2018-10-03 Tom Tromey + + * expression.h (enum exp_opcode): Use uint8_t as base type. + * expprint.c (op_name): Handle invalid opcodes. + 2018-10-03 Tom Tromey * parse.c (prefixify_expression): Add assert. diff --git a/gdb/expprint.c b/gdb/expprint.c index d6ed41253ed..e87b3b709b9 100644 --- a/gdb/expprint.c +++ b/gdb/expprint.c @@ -687,6 +687,13 @@ static int dump_subexp_body (struct expression *exp, struct ui_file *, int); const char * op_name (struct expression *exp, enum exp_opcode opcode) { + if (opcode >= OP_UNUSED_LAST) + { + char *cell = get_print_cell (); + xsnprintf (cell, PRINT_CELL_SIZE, "unknown opcode: %u", + unsigned (opcode)); + return cell; + } return exp->language_defn->la_exp_desc->op_name (opcode); } diff --git a/gdb/expression.h b/gdb/expression.h index bc7625f9842..a5cb4c678e7 100644 --- a/gdb/expression.h +++ b/gdb/expression.h @@ -39,7 +39,7 @@ and skip that many. Strings, like numbers, are indicated by the preceding opcode. */ -enum exp_opcode +enum exp_opcode : uint8_t { #define OP(name) name , -- 2.30.2