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Add memory watchpoint support for source debugger (#1762)

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Allow to add watchpoints to variables for source debugging. For instance:
`breakpoint set variable var`
will pause WAMR execution when the address at var is written to.
Can also set read/write watchpoints by passing r/w flags. This will pause
execution when the address at var is read:
`watchpoint set variable -w read var`

Add two linked lists for read/write watchpoints. When the debug message
handler receives a watchpoint request, it adds/removes to one/both of these
lists. In the interpreter, when an address is read or stored to, check whether
the address is in these lists. If so, throw a sigtrap and suspend the process.
This commit is contained in:
Callum Macmillan
2022-12-07 09:18:28 +00:00
committed by GitHub
parent 9d52960e4d
commit c3d66f916e
4 changed files with 265 additions and 25 deletions
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24
core/iwasm/libraries/debug-engine/debug_engine.h
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@ -36,6 +36,12 @@ typedef struct WASMDebugBreakPoint {
uint64 orignal_data;
} WASMDebugBreakPoint;
typedef struct WASMDebugWatchPoint {
bh_list_link next;
uint64 addr;
uint64 length;
} WASMDebugWatchPoint;
typedef enum debug_state_t {
/* Debugger state conversion sequence:
* DBG_LAUNCHING ---> APP_STOPPED <---> APP_RUNNING
@ -56,6 +62,8 @@ struct WASMDebugInstance {
struct WASMDebugInstance *next;
WASMDebugControlThread *control_thread;
bh_list break_point_list;
bh_list watch_point_list_read;
bh_list watch_point_list_write;
WASMCluster *cluster;
uint32 id;
korp_tid current_tid;
@ -184,6 +192,22 @@ bool
wasm_debug_instance_remove_breakpoint(WASMDebugInstance *instance, uint64 addr,
uint64 length);
bool
wasm_debug_instance_watchpoint_write_add(WASMDebugInstance *instance,
uint64 addr, uint64 length);
bool
wasm_debug_instance_watchpoint_write_remove(WASMDebugInstance *instance,
uint64 addr, uint64 length);
bool
wasm_debug_instance_watchpoint_read_add(WASMDebugInstance *instance,
uint64 addr, uint64 length);
bool
wasm_debug_instance_watchpoint_read_remove(WASMDebugInstance *instance,
uint64 addr, uint64 length);
bool
wasm_debug_instance_on_failure(WASMDebugInstance *instance);