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RENESAS TOOL NEWS [RSO-M3T-NC308WA-030616D]
A Note on Using C Compilers
M3T-NC308WA and M3T-NC30WA
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Please take note of the following problem in using the M3T-NC308WA and M3T-NC30WA C compilers (with an assembler and integrated development environment):
- On displaying the values of arguments passed to a function
- Products and Versions Concerned
- M3T-NC308WA V.5.10 Release 1
- for the M32C/80 and M16C/80 series MCUs
- M3T-NC30WA V.5.10 Release 1
- for the M16C/60, M16C/30, M16C/20, and M16C/10 series MCUs
- Description
The values of arguments passed to a function through a register may not correctly be displayed in the emulator debugger or simulator debugger. However, codes are created correctly.
- Conditions
The conditions under which this problem occurs are as follows:
- In the M3T-NC308WA
- The type of the first argument of a function is _Bool, char, int, or near pointer. (The arguments of these types are all passed to functions through registers.)
- In the M3T-NC30WA
- The type of the first argument of a function is _Bool, char, int, or near pointer; or that of the second argument is int or near pointer. (The arguments of these types are all passed to functions through registers.)
- Example
In the program shown below, the value of argument i cannot correctly be displayed in the debugger.
--------------------------------------------------------
void func(int i, char c) // 1st argument is of type int
{
:
}
--------------------------------------------------------
- Workaround
This problem can be circumvented by performing the following steps:
- (1) Add storage class "register" to the argument displayed incorrectly.
- (2) Select the -fER/-fenable_register option at compilation.
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void func(register int i, char c)
{
:
}
--------------------------------------------------------
- Schedule of fixing the Problem
We plan to fix this problem in our next release of the products.
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